US20050147805A1 - Loose fill thermal insulation containing supplemental infrared radiation absorbing material - Google Patents

Loose fill thermal insulation containing supplemental infrared radiation absorbing material Download PDF

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Publication number
US20050147805A1
US20050147805A1 US11/057,231 US5723105A US2005147805A1 US 20050147805 A1 US20050147805 A1 US 20050147805A1 US 5723105 A US5723105 A US 5723105A US 2005147805 A1 US2005147805 A1 US 2005147805A1
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Prior art keywords
loose fill
scattering material
carbonate
infrared absorbing
product according
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US11/057,231
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Alain Yang
Murray Toas
Michael Noone
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Certainteed LLC
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Certainteed LLC
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/76—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to heat only
    • E04B1/7604—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to heat only fillings for cavity walls
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/58—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives
    • D04H1/64—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives the bonding agent being applied in wet state, e.g. chemical agents in dispersions or solutions
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F21/00—Implements for finishing work on buildings
    • E04F21/02—Implements for finishing work on buildings for applying plasticised masses to surfaces, e.g. plastering walls
    • E04F21/06—Implements for applying plaster, insulating material, or the like
    • E04F21/08—Mechanical implements
    • E04F21/085—Mechanical implements for filling building cavity walls with insulating materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L59/00—Thermal insulation in general
    • F16L59/04—Arrangements using dry fillers, e.g. using slag wool which is added to the object to be insulated by pouring, spreading, spraying or the like
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B2001/742—Use of special materials; Materials having special structures or shape
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/249921—Web or sheet containing structurally defined element or component
    • Y10T428/249924—Noninterengaged fiber-containing paper-free web or sheet which is not of specified porosity
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • Y10T442/699—Including particulate material other than strand or fiber material

Definitions

  • This invention relates to thermal insulation. More specifically, this invention relates to loose fill thermal insulation containing infrared radiation (“IR”) absorbing and scattering material, which reduces radiative heat transfer through the loose fill.
  • IR infrared radiation
  • Mats, batts and blankets are flexible constructions containing various fibers and are generally prefabricated before being brought to a construction site and installed.
  • loose fill thermal insulation includes a large number of discrete fibers, flakes, powders, granules and/or nodules of various materials.
  • the loose fill can be poured or blown into hollow walls or other empty spaces to provide a thermal barrier.
  • Particle to particle radiative heat transfer is due to absorption, emission and scattering.
  • the amount of radiative heat transfer between loose fill particles due to emission and absorption is dependent on the difference in particle temperatures, with each particle temperature taken to the fourth power.
  • U.S. Pat. No. 2,134,340 discloses that multiple reflections of infrared radiation from a powder of an infrared transparent salt, such as calcium fluoride, added to glass fiber insulation can prevent the infrared radiation from penetrating any substantial distance into the insulation.
  • an infrared transparent salt such as calcium fluoride
  • U.S. Pat. No. 5,633,077 discloses that an insulating material combining certain chiral polymers with fibers can block the passage of infrared radiation through the insulating material.
  • U.S. Pat. No. 5,932,449 discloses that glass fiber compositions displaying decreased far infrared radiation transmission may be produced from soda-lime borosilicate glasses having a high boron oxide content and a low concentration of alkaline earth metal oxides.
  • a loose fill thermal insulation product in which an IR absorbing and scattering material is dispersed in a loose fill.
  • the IR absorbing and scattering material can be applied to the loose fill before or at the same time as the loose fill is poured or blown into spaces requiring thermal insulation, such as attics and walls.
  • the IR absorbing and scattering material substantially reduces the radiative heat loss through the loose fill thermal insulation. Inclusion of the IR absorbing and scattering material improves the effective wavelength range over which the loose fill absorbs infrared radiation and improves its overall extinction efficiency.
  • the IR absorbing and scattering materials are about as effective as glass fiber in reducing radiative heat loss through a glass fiber loose fill, but they can be much less expensive than glass fiber. Hence, the IR absorbing and scattering material can provide a cost-effective means of improving loose fill thermal insulation.
  • FIGS. 1 a - 1 d show the absorption spectra of silica, glass fiber, calcium carbonate and borax;
  • FIG. 2 shows a method of applying IR absorbing and scattering material (“IRM”) to loose fill
  • FIG. 3 shows a method of applying IR absorbing and scattering material (“IRM”) to loose fill
  • FIG. 4 shows the variation in thermal conductivity (“K-value”) of mixtures of cellulose loose fill and 12 wt % CaCO 3 (based on the mixture) as a function of the particle size of the CaCO 3 .
  • the present invention reduces the radiant transmission of heat through a loose fill thermal insulation product by dispersing an IR absorbing and scattering material in the loose fill. Because the IR absorbing and scattering material can be less expensive than the loose fill, the substitution of the IR absorbing and scattering material for some of the loose fill can lead to a significant cost reduction in thermal insulation.
  • a suitable IR absorbing and scattering material absorbs and scatters infrared radiation with a wavelength in the 4 to 40 ⁇ m range.
  • the IR absorbing and scattering material absorbs 6-8 ⁇ m (1667-1250 cm ⁇ 1 ) infrared radiation.
  • the IR absorbing and scattering material can include one or more alkali metal salts or alkaline earth metal salts containing borates, carbonates, nitrates and nitrites. Borates and carbonates are preferred.
  • Suitable borates include lithium borate, sodium borate, potassium borate, magnesium borate, calcium borate, strontium borate and barium borate.
  • the borate is sodium borate (i.e., borax, Na 2 B 4 O 7 .5H 2 O).
  • Suitable carbonates include lithium carbonate, sodium carbonate, potassium carbonate, magnesium carbonate, calcium carbonate, strontium carbonate and barium carbonate.
  • the carbonate is calcium carbonate.
  • FIGS. 1 a - 1 d show the absorption spectra of, respectively, silica, glass fiber, calcium carbonate and borax.
  • the absorption characteristics of calcium carbonate and borax complement those of silica and glass fiber, which have been used commercially in thermal insulation for over fifty years.
  • the amount of IR absorbing and scattering material in the loose fill thermal insulation product can range from 1 to 40 wt %, preferably from 2 to 30 wt %, more preferably from 4 to 20 wt %. If the amount of IR absorbing and scattering material is less than 1 wt %, then the reduction in radiative heat loss is negligible. If the amount of IR absorbing material is in excess of 40 wt %, then the IR absorbing and scattering material forms an undesirable amount of dust, increases the blown density of loose fill, and reduces the coverage of the loose fill thermal insulation product.
  • the IR absorbing and scattering material preferably comprises particles having a mean diameter in a range of from 2 to 10 ⁇ m, more preferably from 3 to 7 ⁇ m, most preferably from 3 to 6 ⁇ m. Methods of measuring particle size are well known in the art and will not be repeated here.
  • the loose fill can be in the form of fibers, flakes, powders, granules and/or nodules of various materials.
  • the loose fill can be compressed during storage to save space, and then expanded or “fluffed-up” with air or another gas when poured or blown into a hollow wall or other empty space.
  • the loose fill can include both organic and inorganic materials.
  • organic loose fill material examples include animal fibers, such as wool; cellulose-containing vegetable fibers, such as cotton, granulated cork (bark of the cork tree) redwood wool (fiberized bark of the redwood tree), and recycled, shredded or ground newspapers; synthetic polymer fibers including cellulosic polymer fibers, such as rayon, and thermoplastic polymer fibers, such as polyester; and expanded plastic beads.
  • animal fibers such as wool
  • cellulose-containing vegetable fibers such as cotton, granulated cork (bark of the cork tree) redwood wool (fiberized bark of the redwood tree), and recycled, shredded or ground newspapers
  • synthetic polymer fibers including cellulosic polymer fibers, such as rayon, and thermoplastic polymer fibers, such as polyester
  • expanded plastic beads examples include expanded plastic beads.
  • inorganic loose fill material examples include diatomaceous silica (fossilized skeletons of microscopic organisms), perlite, vermiculite, silica aerogel, calcium silicate, glass fibers, fibrous potassium titanate, alumina-silica fibers, microquartz fibers, opacified colloidal alumina, zirconia fibers, alumina bubbles, zirconia bubbles, carbon fibers, granulated charcoal, cement fibers, graphite fibers, rock fibers, slag fibers, glass wool and rock wool.
  • the loose fill can include one or more varieties of loose fill material.
  • the loose fill includes fibers or shredded or ground recycled newspapers.
  • the loose fill particles forming the compressed loose fill are each dimensioned so as to have an equivalent sphere with a diameter generally smaller than 3 cm, preferably from 0.1 to 1 cm.
  • the loose fill particles forming the expanded loose fill are each dimensioned so as to just fit within a sphere having a diameter of from 0.1 to 4 cm, preferably from 0.5 to 2 cm.
  • the thermal insulation product of the present invention can be formed by dispersing, preferably uniformly, the IR absorbing and scattering material in the loose fill before or at the same time as the loose fill is poured or blown into an interior, empty space of a hollow or open object, such as a hollow wall or an attic.
  • Methods of pouring and blowing loose fill are well known in the art and will not be repeated here in detail.
  • blowing loose fill involves feeding compressed loose fill into a blower where it is mixed with a gas, such as air, expanded, processed through a blowing hose, and then blown into a hollow or open structure to form thermal insulation.
  • a liquid mixture including a liquid, such as water, and one or more of the IR absorbing and scattering material and a binder (i.e., adhesive), preferably air drying, can be sprayed onto or otherwise mixed with the loose fill before the loose fill is compressed; when the loose fill is decompressed; and/or at the end of the blowing hose before the loose fill is installed in a hollow or open space.
  • the binder serves to join and hold the IR absorbing and scattering material and the loose fill together.
  • the binder can be organic or inorganic.
  • the organic binder can include an organic water based binder such as an acrylic latex or a vinyl acetate latex.
  • the organic binder can also include a sprayed hot melt adhesive such as a thermoplastic polymer.
  • the inorganic binder can include an inorganic bonding agent such as sodium silicate or a hydraulic cement. Evaporation of the liquid from the liquid mixture on the loose fill results in a loose fill thermal insulation product with the IR absorbing and scattering material and/or binder dispersed in the loose fill.
  • the IR absorbing and scattering material and the binder can be added to the loose fill at the same time or at different times.
  • a mineral oil can be used instead of or in addition to the binder for the purpose of dust reduction.
  • FIG. 2 shows embodiments of the invention in which loose fill 1 is fed along with IR absorbing and scattering material 2 (“IRM 2 ”) into mixer 3 to form a mixture of loose fill 1 and IRM 2 .
  • binder 4 and/or mineral oil 5 can also be mixed in mixer 3 with loose fill 1 and the IRM 2 .
  • the mixture is then fed to compressor 6 , where the mixture is compressed to remove air and increase density.
  • the compressed mixture is then fed to packager 7 , where the compressed mixture is packaged as compressed loose fill 8 .
  • FIG. 3 shows that compressed loose fill 8 can then be fed via a chute or hopper 9 into a blower 10 .
  • Blower 10 uses gas 11 to decompress, expand and process the compressed loose fill 8 including the IRM 2 through a corrugated blowing hose 12 . From blower 10 expanded loose fill 13 is blown into an open attic 14 to provide thermal insulation.
  • IRM 2 , binder 4 and/or mineral oil 5 is added along with the compressed loose fill 8 to blower 10 , and blower 10 both mixes the IRM 2 , binder 4 and/or mineral oil 5 with compressed loose fill 8 and expands compressed loose fill 8 .
  • IRM 2 , binder 4 and/or mineral oil 5 is added to expanded loose fill 13 in a liquid spray application injected near the end of the blowing hose 12 or sprayed on the expanded loose fill 13 as it exits the blowing hose 12 and is blown into the open attic 14 .
  • Cellulose loose fill, rock wool loose fill, and glass fiber loose fill were each separately mixed with 4 ⁇ m mean diameter CaCO 3 particles in a blowing machine.
  • the CaCO 3 particles formed 12% by weight of each mixture.
  • each mixture of loose fill and CaCO 3 was blown into three 24 ′′ ⁇ 24′′ ⁇ 6′′ boxes for thermal resistance testing in accordance with ASTM C518 at a mean temperature of 75° F.
  • cellulose loose fill, rock wool loose fill, and glass fiber loose fill, without added CaCO 3 were blown into three thermal test boxes under the same blowing conditions. The thermal resistance of the test boxes when filled with only the loose fill was compared with the thermal resistance of the test boxes when filled with the mixture of the loose fill and CaCO 3 .
  • CaCO 3 particles with mean diameters of 3 ⁇ m, 5 ⁇ m and 9 ⁇ m were each separately mixed with cellulose loose fill in a blowing machine.
  • the CaCO 3 formed 12 wt % of each mixture.
  • the mixtures of loose fill and CaCO 3 were each separately blown into one 24′′ ⁇ 24′′ ⁇ 6′′ box.
  • the product density was 1.5 lb/ft3.
  • Thermal conductivity testing in accordance with ASTM C518 was conducted at a mean temperature of 75° F. The results are shown in Table 2.
  • FIG. 4 plots the variation in thermal conductivity with CaCO 3 particle size that is shown in Table 2.
  • FIG. 4 shows that the CaCO 3 particle size providing optimal improvement in reducing thermal conductivity is in the range of about 3.5 ⁇ m to about 6 ⁇ m.

Abstract

A thermal insulation product includes infrared radiation absorbing and scattering material dispersed on a loose fill. The infrared absorbing material can include borates, carbonates, nitrates and nitrites of alkali metals and alkaline earth metals.

Description

    BACKGROUND OF THE INVENTION
  • 1. Field of the Invention
  • This invention relates to thermal insulation. More specifically, this invention relates to loose fill thermal insulation containing infrared radiation (“IR”) absorbing and scattering material, which reduces radiative heat transfer through the loose fill.
  • 2. Description of Related Art
  • Thermal insulation for buildings and other structures is available in the form of mats, batts, blankets and loose fill. Mats, batts and blankets are flexible constructions containing various fibers and are generally prefabricated before being brought to a construction site and installed.
  • In contrast, loose fill thermal insulation includes a large number of discrete fibers, flakes, powders, granules and/or nodules of various materials. The loose fill can be poured or blown into hollow walls or other empty spaces to provide a thermal barrier.
  • Heat passes between two surfaces having different temperatures by three mechanisms: convection, conduction and radiation. These heat transfer mechanisms are combined in a quantitative measure of heat transfer known as “apparent thermal conductivity.”
  • Insertion of loose fill thermal insulation in the gap between two surfaces reduces convection as a heat transport mechanism because the insulation slows or stops the circulation of air. Heat transfer by conduction through the loose fill is also minimal. However, many loose fill compositions are transparent in portions of the infrared spectrum. Thus, even when the gap between surfaces has been filled with loose fill thermal insulation, radiation remains as a significant heat transfer mechanism. Typically, radiation can account for 10 to 40% of the heat transferred between surfaces at room (e.g., 24° C.) temperature.
  • Particle to particle radiative heat transfer is due to absorption, emission and scattering. The amount of radiative heat transfer between loose fill particles due to emission and absorption is dependent on the difference in particle temperatures, with each particle temperature taken to the fourth power.
  • To reduce radiative heat loss through thermal insulation, a number of approaches have been considered.
  • U.S. Pat. No. 2,134,340 discloses that multiple reflections of infrared radiation from a powder of an infrared transparent salt, such as calcium fluoride, added to glass fiber insulation can prevent the infrared radiation from penetrating any substantial distance into the insulation.
  • U.S. Pat. No. 5,633,077 discloses that an insulating material combining certain chiral polymers with fibers can block the passage of infrared radiation through the insulating material.
  • U.S. Pat. No. 5,932,449 discloses that glass fiber compositions displaying decreased far infrared radiation transmission may be produced from soda-lime borosilicate glasses having a high boron oxide content and a low concentration of alkaline earth metal oxides.
  • However, these conventional approaches have focused on reducing radiative heat loss through prefabricated fibrous mats, bats, blankets and boards, but have not addressed how to improve the insulation properties of loose fill.
  • There remains a need for a cost effective loose fill thermal insulation product that can reduce radiative heat loss.
    • SUMMARY OF THE INVENTION
  • A loose fill thermal insulation product is provided in which an IR absorbing and scattering material is dispersed in a loose fill. The IR absorbing and scattering material can be applied to the loose fill before or at the same time as the loose fill is poured or blown into spaces requiring thermal insulation, such as attics and walls. The IR absorbing and scattering material substantially reduces the radiative heat loss through the loose fill thermal insulation. Inclusion of the IR absorbing and scattering material improves the effective wavelength range over which the loose fill absorbs infrared radiation and improves its overall extinction efficiency. The IR absorbing and scattering materials are about as effective as glass fiber in reducing radiative heat loss through a glass fiber loose fill, but they can be much less expensive than glass fiber. Hence, the IR absorbing and scattering material can provide a cost-effective means of improving loose fill thermal insulation.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • The preferred embodiments of the invention will be described in detail, with reference to the following figures, wherein:
  • FIGS. 1 a-1 d show the absorption spectra of silica, glass fiber, calcium carbonate and borax;
  • FIG. 2 shows a method of applying IR absorbing and scattering material (“IRM”) to loose fill;
  • FIG. 3 shows a method of applying IR absorbing and scattering material (“IRM”) to loose fill; and
  • FIG. 4 shows the variation in thermal conductivity (“K-value”) of mixtures of cellulose loose fill and 12 wt % CaCO3 (based on the mixture) as a function of the particle size of the CaCO3.
    • DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
  • The present invention reduces the radiant transmission of heat through a loose fill thermal insulation product by dispersing an IR absorbing and scattering material in the loose fill. Because the IR absorbing and scattering material can be less expensive than the loose fill, the substitution of the IR absorbing and scattering material for some of the loose fill can lead to a significant cost reduction in thermal insulation.
  • A suitable IR absorbing and scattering material absorbs and scatters infrared radiation with a wavelength in the 4 to 40 μm range. Preferably, the IR absorbing and scattering material absorbs 6-8 μm (1667-1250 cm−1) infrared radiation. The IR absorbing and scattering material can include one or more alkali metal salts or alkaline earth metal salts containing borates, carbonates, nitrates and nitrites. Borates and carbonates are preferred. Suitable borates include lithium borate, sodium borate, potassium borate, magnesium borate, calcium borate, strontium borate and barium borate. Preferably, the borate is sodium borate (i.e., borax, Na2B4O7.5H2O). Suitable carbonates include lithium carbonate, sodium carbonate, potassium carbonate, magnesium carbonate, calcium carbonate, strontium carbonate and barium carbonate. Preferably, the carbonate is calcium carbonate.
  • FIGS. 1 a-1 d show the absorption spectra of, respectively, silica, glass fiber, calcium carbonate and borax. The absorption characteristics of calcium carbonate and borax complement those of silica and glass fiber, which have been used commercially in thermal insulation for over fifty years.
  • The amount of IR absorbing and scattering material in the loose fill thermal insulation product can range from 1 to 40 wt %, preferably from 2 to 30 wt %, more preferably from 4 to 20 wt %. If the amount of IR absorbing and scattering material is less than 1 wt %, then the reduction in radiative heat loss is negligible. If the amount of IR absorbing material is in excess of 40 wt %, then the IR absorbing and scattering material forms an undesirable amount of dust, increases the blown density of loose fill, and reduces the coverage of the loose fill thermal insulation product.
  • The IR absorbing and scattering material preferably comprises particles having a mean diameter in a range of from 2 to 10 μm, more preferably from 3 to 7 μm, most preferably from 3 to 6 μm. Methods of measuring particle size are well known in the art and will not be repeated here.
  • The loose fill can be in the form of fibers, flakes, powders, granules and/or nodules of various materials. Preferably, the loose fill can be compressed during storage to save space, and then expanded or “fluffed-up” with air or another gas when poured or blown into a hollow wall or other empty space. The loose fill can include both organic and inorganic materials. Examples of organic loose fill material include animal fibers, such as wool; cellulose-containing vegetable fibers, such as cotton, granulated cork (bark of the cork tree) redwood wool (fiberized bark of the redwood tree), and recycled, shredded or ground newspapers; synthetic polymer fibers including cellulosic polymer fibers, such as rayon, and thermoplastic polymer fibers, such as polyester; and expanded plastic beads. Examples of inorganic loose fill material include diatomaceous silica (fossilized skeletons of microscopic organisms), perlite, vermiculite, silica aerogel, calcium silicate, glass fibers, fibrous potassium titanate, alumina-silica fibers, microquartz fibers, opacified colloidal alumina, zirconia fibers, alumina bubbles, zirconia bubbles, carbon fibers, granulated charcoal, cement fibers, graphite fibers, rock fibers, slag fibers, glass wool and rock wool. The loose fill can include one or more varieties of loose fill material. Preferably, the loose fill includes fibers or shredded or ground recycled newspapers.
  • When compressed during storage, the loose fill particles forming the compressed loose fill are each dimensioned so as to have an equivalent sphere with a diameter generally smaller than 3 cm, preferably from 0.1 to 1 cm. After the compressed loose fill is decompressed, expanded and processed through a blowing hose, the loose fill particles forming the expanded loose fill are each dimensioned so as to just fit within a sphere having a diameter of from 0.1 to 4 cm, preferably from 0.5 to 2 cm.
  • The thermal insulation product of the present invention can be formed by dispersing, preferably uniformly, the IR absorbing and scattering material in the loose fill before or at the same time as the loose fill is poured or blown into an interior, empty space of a hollow or open object, such as a hollow wall or an attic. Methods of pouring and blowing loose fill are well known in the art and will not be repeated here in detail. Generally, blowing loose fill involves feeding compressed loose fill into a blower where it is mixed with a gas, such as air, expanded, processed through a blowing hose, and then blown into a hollow or open structure to form thermal insulation.
  • In embodiments, a liquid mixture including a liquid, such as water, and one or more of the IR absorbing and scattering material and a binder (i.e., adhesive), preferably air drying, can be sprayed onto or otherwise mixed with the loose fill before the loose fill is compressed; when the loose fill is decompressed; and/or at the end of the blowing hose before the loose fill is installed in a hollow or open space. The binder serves to join and hold the IR absorbing and scattering material and the loose fill together. The binder can be organic or inorganic. The organic binder can include an organic water based binder such as an acrylic latex or a vinyl acetate latex. The organic binder can also include a sprayed hot melt adhesive such as a thermoplastic polymer. The inorganic binder can include an inorganic bonding agent such as sodium silicate or a hydraulic cement. Evaporation of the liquid from the liquid mixture on the loose fill results in a loose fill thermal insulation product with the IR absorbing and scattering material and/or binder dispersed in the loose fill. In various embodiments, the IR absorbing and scattering material and the binder can be added to the loose fill at the same time or at different times.
  • A mineral oil can be used instead of or in addition to the binder for the purpose of dust reduction.
  • FIG. 2 shows embodiments of the invention in which loose fill 1 is fed along with IR absorbing and scattering material 2 (“IRM 2”) into mixer 3 to form a mixture of loose fill 1 and IRM 2. In embodiments, binder 4 and/or mineral oil 5 can also be mixed in mixer 3 with loose fill 1 and the IRM 2. The mixture is then fed to compressor 6, where the mixture is compressed to remove air and increase density. The compressed mixture is then fed to packager 7, where the compressed mixture is packaged as compressed loose fill 8.
  • FIG. 3 shows that compressed loose fill 8 can then be fed via a chute or hopper 9 into a blower 10. Blower 10 uses gas 11 to decompress, expand and process the compressed loose fill 8 including the IRM 2 through a corrugated blowing hose 12. From blower 10 expanded loose fill 13 is blown into an open attic 14 to provide thermal insulation. In other embodiments, IRM 2, binder 4 and/or mineral oil 5 is added along with the compressed loose fill 8 to blower 10, and blower 10 both mixes the IRM 2, binder 4 and/or mineral oil 5 with compressed loose fill 8 and expands compressed loose fill 8. In still other embodiments, IRM 2, binder 4 and/or mineral oil 5 is added to expanded loose fill 13 in a liquid spray application injected near the end of the blowing hose 12 or sprayed on the expanded loose fill 13 as it exits the blowing hose 12 and is blown into the open attic 14.
    • EXAMPLES
  • The following non-limiting examples will further illustrate the invention.
    • Example 1
  • Cellulose loose fill, rock wool loose fill, and glass fiber loose fill were each separately mixed with 4 μm mean diameter CaCO3 particles in a blowing machine. The CaCO3 particles formed 12% by weight of each mixture. Through a corrugated hose, each mixture of loose fill and CaCO3 was blown into three 24″×24″×6″ boxes for thermal resistance testing in accordance with ASTM C518 at a mean temperature of 75° F. For comparison cellulose loose fill, rock wool loose fill, and glass fiber loose fill, without added CaCO3, were blown into three thermal test boxes under the same blowing conditions. The thermal resistance of the test boxes when filled with only the loose fill was compared with the thermal resistance of the test boxes when filled with the mixture of the loose fill and CaCO3. The results are shown below in Table 1.
    TABLE 1
    With 12 wt %
    Without Calcium Calcium Carbonate
    Carbonate (4 μm mean particle size)
    Density Thermal Density Thermal
    Loose Fill (lb/ft3) Conductivity* (lb/ft3) Conductivity*
    Cellulose 1.50 0.332 1.71 0.296
    Rock wool 2.90 0.288 3.30 0.268
    Glass Fiber 0.350 0.434 0.398 0.405

    *units of Btu · inch/hr · ft2 · ° F.
  • It was found that adding 12 wt % of 4 μm mean diameter CaCO3 particles reduced the thermal conductivity and improved the thermal resistance of cellulose loose fill by 10.8%, of rock wool loose fill by 6.9%, and of glass fiber loose fill by 6.7%.
    • Example 2
  • CaCO3 particles with mean diameters of 3 μm, 5 μm and 9 μm were each separately mixed with cellulose loose fill in a blowing machine. The CaCO3 formed 12 wt % of each mixture. The mixtures of loose fill and CaCO3 were each separately blown into one 24″×24″×6″ box. The product density was 1.5 lb/ft3. Thermal conductivity testing in accordance with ASTM C518 was conducted at a mean temperature of 75° F. The results are shown in Table 2.
    TABLE 2
    Density
    Loose Fill (lb/ft3) Thermal Conductivity*
    Cellulose with 12 wt % CaCO3 1.50 0.319
    (3 μm mean particle size)
    Cellulose with 12 wt % CaCO3 1.50 0.262
    (5 μm mean particle size)
    Cellulose with 12 wt % CaCO3 1.50 0.362
    (9 μm mean particle size)

    *units of Btu · inch/hr · ft2 · ° F.
  • FIG. 4 plots the variation in thermal conductivity with CaCO3 particle size that is shown in Table 2. FIG. 4 shows that the CaCO3 particle size providing optimal improvement in reducing thermal conductivity is in the range of about 3.5 μm to about 6 μm.
  • While the present invention has been described with respect to specific embodiments, it is not confined to the specific details set forth, but includes various changes and modifications that may suggest themselves to those skilled in the art, all falling within the scope of the invention as defined by the following claims.

Claims (17)

1-30. (canceled)
31. A thermal insulation product, comprising:
a loose fill; and
at least one infrared absorbing or scattering material selected from the group consisting of borate, carbonate, nitrate and nitrite salts with at least one alkali or alkaline earth metal dispersed in the loose fill,
wherein the at least one infrared absorbing or scattering material comprises particles having a mean diameter ranging from 2 to 10 μm.
32. The product according to claim 31, wherein the at least one infrared absorbing or scattering material is at least one alkali metal or alkaline earth metal carbonate.
33. The product according to claim 31, wherein the mean diameter of the particles ranges from 3 to 6 μm.
34. The product according to claim 31, wherein the content of IR absorbing or scattering material in the loose fill ranges from 1 to 40% by wt.
35. The product according to claim 31, wherein the loose fill comprises fibers selected from the group consisting of cellulose-containing fibers, synthetic polymer fibers, rock wool fibers, and glass fibers.
36. The product according to claim 31, wherein the loose fill comprises at least one material selected from the group consisting of shredded recycled newspapers and ground recycled newspapers.
37. The product according to claim 32, wherein the at least one carbonate is dispersed uniformly in the loose fill.
38. The product according to claim 37, wherein the at least one carbonate is calcium carbonate.
39. The product according to claim 31, further comprising a binder that bonds the at least one infrared absorbing or scattering material to the loose fill.
40. The product according to claim 32, wherein the at least one carbonate absorbs infrared radiation having a wavelength in the range of 4 to 40 μm.
41. The product according to claim 31, wherein the loose fill is in the form of at least one of flakes, powders, granules or nodules.
42. The product according to claim 31, wherein the loose fill is at least one inorganic material selected from the group consisting of diatomaceous silica, perlite, vermiculite, silica aerogel, calcium silicate, opacified colloidal alumina, alumina bubbles, zirconia bubbles, and granulated charcoal.
43. A thermal insulation product, comprising:
a loose fill; and
at least one carbonate as particles have a mean diameter ranging from 2 to 10 μm dispersed in the loose fill, wherein the particles of loose fill having carbonate particles adhered thereto, upon compressing are dimensional so as to have an equivalent sphere with a diameter of less than 3 cm, but upon decompression and expansion are dimensional so as to fit within a sphere having a diameter ranging from 0.1 to 4 cm.
44. A thermal insulation product prepared by a process, comprising:
dispersing at least one particulate infrared absorbing or scattering material into a loose insulation fill material as it is blown into a zone of a construction object that is to contain insulating material, wherein the particulate infrared absorbing or scattering material is at least one material selected from the group consisting of borate, carbonate, nitrate and nitrite salts with at least one alkali or alkaline earth metal, wherein the at least one infrared absorbing or scattering material comprises particles having a mean diameter ranging from 2 to 10 μm.
45. A thermal insulation product prepared by a process, comprising:
mixing mineral oil alone or in combination with a binder and at least one particulate infrared absorbing or scattering material elected from the group consisting of borate, carbonate, nitrate and nitrite salts with at least one alkali or alkaline earth metal, wherein the at least one infrared absorbing or scattering material comprises particles having a mean diameter ranging from 2 to 10 μm, with a loose fill material, thereby dispersing the mineral oil alone or optionally with said binder and the infrared absorbing or scattering material in the loose fill.
46. An object of construction having zones that are thermally insulated, comprising:
an object of construction having zones that require thermal insulation and loose insulating material filled therein, wherein the insulating material is a loose fill in which is dispersed at least one infrared absorbing or scattering material selected from the group consisting of borate, carbonate, nitrate and nitrite salts with at least one alkali or alkaline earth metal, wherein the at least one infrared absorbing or scattering material comprises particles having a mean diameter ranging from 2 to 10 μm.
US11/057,231 2001-11-08 2005-02-15 Loose fill thermal insulation containing supplemental infrared radiation absorbing material Abandoned US20050147805A1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012135445A1 (en) * 2011-03-30 2012-10-04 Owens Corning Intellectual Capital, Llc High thermal resistivity insulation material with opacifier uniformly distributed throughout

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7174747B2 (en) * 2002-06-20 2007-02-13 Certainteed Corporation Use of corrugated hose for admix recycling in fibrous glass insulation
US7449125B2 (en) * 2004-05-20 2008-11-11 Guardian Fiberglass, Inc. Insulation with mixture of fiberglass and cellulose
US8132382B2 (en) * 2004-06-17 2012-03-13 Certainteed Corporation Insulation containing heat expandable spherical additives, calcium acetate, cupric carbonate, or a combination thereof
US20050281979A1 (en) * 2004-06-17 2005-12-22 Toas Murray S Loose fill insulation product having phase change material therein
WO2008089085A1 (en) * 2007-01-12 2008-07-24 Knauf Insulation Gmbh Graphite-mediated control of static electricity on fiberglass
US20080236078A1 (en) * 2007-03-30 2008-10-02 Certainteed Corporation Attic Insulation with Desiccant
US8820028B2 (en) 2007-03-30 2014-09-02 Certainteed Corporation Attic and wall insulation with desiccant
FI2257502T4 (en) 2008-02-28 2022-12-15 Product based on mineral fibres and process for obtaining same
DE102009018688B4 (en) * 2009-04-23 2017-03-02 Knauf Insulation Mineral wool product
DE102009050686A1 (en) * 2009-10-26 2011-05-05 Leoni Kabel Holding Gmbh Method and device for producing a thermally insulated pipeline, in particular for cryogenic media
CA2809479A1 (en) 2012-03-30 2013-09-30 Certainteed Corporation Roofing composite including dessicant and method of thermal energy management of a roof by reversible sorption and desorption of moisture

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4075799A (en) * 1976-08-30 1978-02-28 Lemelson Jerome H Building insulation system and method
US4385477A (en) * 1981-10-23 1983-05-31 Walls Earl M Loose-fill insulation method and apparatus
US5264257A (en) * 1991-04-29 1993-11-23 Manville Corporation Glass composite sheathing board
US5591505A (en) * 1995-06-07 1997-01-07 Owens-Corning Fiberglas Technology, Inc. Fibrous insulation product having inorganic binders
US5786082A (en) * 1993-11-05 1998-07-28 Owens Corning Fiberglas Technology, Inc. Loose-fill insulation having irregularly shaped fibers
US6086998A (en) * 1996-12-23 2000-07-11 Protekum Umweltinstitut Gmbh Oranienburg Non-inflammable fiber product
US6331339B1 (en) * 1996-10-10 2001-12-18 Johns Manville International, Inc. Wood laminate and method of making
US20040152824A1 (en) * 2001-05-31 2004-08-05 Richard Dobrowolski Surfactant-containing insulation binder
US20050013980A1 (en) * 2001-05-17 2005-01-20 Toas Murray S Thermal insulation containing supplemental infrared radiation absorbing material

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4075799A (en) * 1976-08-30 1978-02-28 Lemelson Jerome H Building insulation system and method
US4385477A (en) * 1981-10-23 1983-05-31 Walls Earl M Loose-fill insulation method and apparatus
US5264257A (en) * 1991-04-29 1993-11-23 Manville Corporation Glass composite sheathing board
US5786082A (en) * 1993-11-05 1998-07-28 Owens Corning Fiberglas Technology, Inc. Loose-fill insulation having irregularly shaped fibers
US5591505A (en) * 1995-06-07 1997-01-07 Owens-Corning Fiberglas Technology, Inc. Fibrous insulation product having inorganic binders
US5869407A (en) * 1995-06-07 1999-02-09 Owens Corning Fiberglas Technology, Inc. Fibrous insulation product having inorganic binders
US6331339B1 (en) * 1996-10-10 2001-12-18 Johns Manville International, Inc. Wood laminate and method of making
US6086998A (en) * 1996-12-23 2000-07-11 Protekum Umweltinstitut Gmbh Oranienburg Non-inflammable fiber product
US20050013980A1 (en) * 2001-05-17 2005-01-20 Toas Murray S Thermal insulation containing supplemental infrared radiation absorbing material
US20040152824A1 (en) * 2001-05-31 2004-08-05 Richard Dobrowolski Surfactant-containing insulation binder

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012135445A1 (en) * 2011-03-30 2012-10-04 Owens Corning Intellectual Capital, Llc High thermal resistivity insulation material with opacifier uniformly distributed throughout
US9938712B2 (en) 2011-03-30 2018-04-10 Owens Corning Intellectual Capital, Llc High thermal resistivity insulation material with opacifier uniformly distributed throughout

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