DE2453146A1 - Improving light fastness of colour on polypropylene - using known u.v. -absorbing cpds - Google Patents

Abstract

Agent for improving the light-fastness of colours on polypropylene- or basically-modified polypropylene fibres contains a U.V. light absorbing substance. Esp. suitable are particular cpds. derived from benzophenone, pyrazole and benzotriazine. The agents are applied to commercially known (basically modified) polypropylene fibres, or e.g. textile structures contg. at least a proportion of these fibres, and then fixed by thermal treatment (e.g. at 100 degrees C). This treatment may take place before, during or after a colouring or printing process. In contrast to known agents for protecting polypropylene fibres, the above agents are not inclined to foam and do not have an adverse effect on the fixing of the colours. Suitable U.V. absorbing cpds. are e.g. of formula (I): where (a) R is H; X is C8H17; (b) is H; X is C(CH3)3; and (c) R is H; X is H.

Description

Agent for improving the lightfastness of dyed polypropylene fibers The present invention relates to agents for improving the lightfastness of dyed basic inodified polypropylene, especially of fiber made from it or Fiber blends. The agents according to the invention contain UV-absorbing compounds.

The invention further relates to a method for improving light fastness Basically modified polypropylenes as well as those according to the invention, with regard to the Polypropylenes themselves improved lightfastness.

It is known that prints and dyeings are based on modified Polypropylene fibers (e.g. those that are commercially available under the name Meraklon) show moderate lightfastness in some shade areas.

This critical range of nuances extends from bluish red about purple, blue, turquoise and green.

The appearance can especially with anionic dyes of the various Classes, e.g. acid dyes, substantive dyes, metal complex dyes, Reactive dyes, etc. can be observed.

It is known that UV radiation in the fiber structure of polypropylene fibers be harmed. For this reason, substances that absorb UV rays have been used added to the melt before spinning. However, it could not do this Improvement of the problem of poor light fastness described above was achieved will.

In the literature (Vibre et Colorie ", Jan. 70, page 34) for Anionic surfactants are recommended to improve the light fastness. These anionic Surfactants are used in the dyeing bath or printing paste when dyeing polypropylene fibers added in concentrations of approx. 2 to 4% or 20 to 40 g / kg. In the exhaust process the treatment is preferably carried out in a separate bath before the dyeing process. In the printing or continuous inking process, the recommended additives are used in the printing paste or added to the dye liquor.

It has now been found that, surprisingly, the lightfastness is achieved of dyeing on polypropylene or basic modified polypropylene fibers can be done by applying ultraviolet rays to this before, during or after dyeing absorbing substance applies and fixed.

The present invention thus provides means for improvement the lightfastness of dyeings on polypropylene or basic modified polypropylene fibers, which are characterized by having ultraviolet ray absorbing substances contain.

The present invention also relates to the above mentioned agents treated textile material.

Particularly suitable UV-absorbing compounds for the agents according to the invention are those from French patent specification No. 1,195,307 and from German laid-open specification Nos. 2,142,353 and 2,335,441 known compounds. UV-absorbing substances as described in Swiss patent application No. 9249/73 are also suitable. The following compounds from the series of benzophenones, pyrazoles and benzotriazines have proven to be particularly suitable: x = C (CH3) 3 TINUVIN 327 X = C (CH3) 3 The UV-absorbing substances are applied mechanically to the commercially available, known, base-modified polypropylene fibers or to flat structures which contain these fibers or parts of these fibers and are fixed by thermal treatment. It is possible to carry out this treatment both before, during and after a dyeing or printing process, but the treatment is preferably carried out during the dyeing or printing process. Printing process. The anionic dyes fixed in the fiber are protected from the damaging effects of UV rays and thus better lightfastness is achieved.

The previously known means for protecting polypropylene fibers against UV rays based on certain anionic surfactants have the disadvantage of being strong Foam formation during mechanical treatment processes as well as retarding influences on the fixation of the dyes. The strong foaming prevents in particular an undisturbed production process during the printing process. The used according to the invention Substances, on the other hand, do not tend to foam due to their insolubility in water and also do not negatively affect the fixing process of the dyes.

Calculated on the material to be treated, between 0.1 and 6% by weight of the UV rays absorbing substance is used, preferably 0.5 to 2 percent by weight are suitable.

The UV-absorbing substances used according to the invention depending on the desired application method, they are processed into suitable ones Preparations transferred. This means: aqueous suspensions, solutions in organic solvents, e.g.

Ethers, esters, ketones etc., or suspensions in organic ones Solvents that have a carrier effect for the process of fixing UV absorbing rays Exercise substances and / or the dyes used.

Dispersants, emulsifiers, etc., as they can be found in stores, can be added if necessary. Preparations are preferred used, in which printing pastes contain up to 50% of the UV-absorbing agent can be, in the case of liquors, the content is appropriately somewhat lower and is usually between 15 and 30%.

The thermal fixing process is preferably done by steaming without Pressure at 1000C or possibly overpressure up to approx. 2 atmospheres or up to the tolerance point the treated fiber, or carried out by treatment in an aqueous medium at 100 ° C. For short or long periods of treatment with hot air or a mixture of hot air and steam up to 1300C (e.g. between 3 and 60 minutes) is the fixation of the UV-absorbing rays Substance generally insufficient. The fixing process takes place in neutral to strongly acidic medium, preferably in a strongly acidic medium up to approx. pH 3.

In the following examples, parts mean parts by weight and percentages Weight percent. The temperatures are given in degrees Celsius.

EXAMPLE 1 Flake is treated in a laboratory staining beaker Basically modified polypropylene fibers (Meraklon) in an aqueous medium under the following Conditions with: 3% formic acid 87% 9% of a suspension of: 20 parts of Tinuvin 327 5 parts Lyocol 0 and 75 parts water.

The liquor ratio is 1:40. The temperature is 2Qo. During 15 minutes, it is heated up to 980 and held at 98 "for 45 minutes. Then is rinsed cold. (The percentages are based on the weight of the material).

It is then dyed in the usual way by adding what is to be dyed Material with 1%, calculated on the weight of the material, of the dye Nylosan blue F-L and 4% formic acid, 87% added and heated from 200 to 980 over 40 minutes and then treated further for 60 minutes at this temperature. One receives a blue-colored fiber material that is not pretreated compared to such a thing has a 1 1/2 grades better lightfastness (measurement according to DIEN) example 2 Printing pastes are produced according to the following recipes: P r u c k p a s t e a): 2 parts Nylosan blue C-L 338 parts hot water 600 parts etherified locust bean gum 3% 30 parts formic acid 87% 30 parts of a suspension, consisting of: 150 Parts Tinuvin 327 50 parts Sandopan DTC 800 «parts monophenyl glycol ether 1000 Parts of pressure p a s t b): 2 parts of Nylosan Green CP-GL 338 parts of hot water 600 parts etherified locust bean gum 3% 30 parts formic acid 87% 30 Parts of a suspension consisting of: 150 parts of Tinuvin 327 50 parts of Sandopan DTC 800 parts Monophenyl glycol ether 1000 parts P r u c k p a s t e c): 2 parts Drimalanorange F-GL 338 parts hot water 600 parts etherified Locust bean gum 3 days 30 parts formic acid 87% 30 parts of a suspension, Consists of: 150 parts Tinuvin 327 50 parts Sandopan DTC 800 parts monophenyl glycol ether 1000 parts pressure p a s t e): 0.5 parts Drimarenschwarz Z-BL 309.5 parts hot Water 600 parts of etherified locust bean gum 3 Zig 30 parts of formic acid 87 % 60 parts of a suspension consisting of: 150 parts of Tinuvin 327 50 parts of Sandopan DTC 800 parts Monophenyl glycol ether 1000 parts In a continuous process is a needle felt floor covering made of basic modified polypropylene fibers with the Dye lotte soaked, squeezed between rubber rollers to about 100% liquor pick-up and then directly using the known rotary film printing process with the Printing pastes a) to c) printed. Closes to the printing process themselves directly, without drying, the fixation of the printing pastes or the dye liquor. she takes place in a normal hanging loop or horizontal damper for 8 to 10 Minutes under saturated steam conditions at 100 to 1020.

The needle felt is then washed and dried.

A blue, green-orange print motif on a gray background is obtained a 1 to 1 1/2 notes higher lightfastness than a similar print without the lightfastness-improving additive with Tinuvin 327.

EXAMPLE 1 3 Printing pastes are made according to the following recipes her: P a s t e a): 3 parts Lanasyn red 2 GL 20 parts thiodiglycol 387 parts hot water 500 parts of etherified carob gum 9% 60 parts of ammonium sulfate solid 30 parts of a suspension consisting of: 150 parts Tinuvin 327 50 parts Sandopan DTC 800 parts Monophenyl glycol ether 1000 parts DLucka st e b): 2 parts lanasyn brown 2 GL 20 parts thiodiglycol 388 parts hot water 500 parts of etherified locust bean gum 9 ig 60 parts solid ammonium sulfate 30 parts a suspension consisting of: 150 parts Tinuvin 327 50 parts Sandopan DTC 800 Parts of monophenyl glycol ether 1000 parts are printed with the pastes a) and b) according to the specified recipes using film printing stencils a needle felt made of basic modified polypropylene fibers (Meraklon). This is followed by approx. 1000 dried and for 15 minutes with steam of approx. 1270 and a pressure of 1.5 atm in a standard star damper. After washing at 600 with a commercially available detergent gives a printed sheet with red and brown motifs, which is about 2 grades better in lightfastness than one that is made with printing pastes without the UV-absorbing substance Tinuvin 327 was printed.

EXAMPLE 1 4 A carpet material is dyed or printed of base modified polypropylene fibers (Meraklon) with the compositions of Examples 1 to 3, but without UV-absorbing substances. The lightfastness this coloring is subsequently improved by 1 to 2 notes by adding the colored Soak carpets by immersing them in a padding liquor of the following composition: 60 parts of a preparation consisting of: 150 parts Tinuvin 327 50 parts Sandopan DTC 800 parts monophenyl glycol ether 400 parts etherified locust bean gum 4% 30 parts formic acid 87% 510 parts water 1000 parts The excess of this The liquor is squeezed between rubber rollers and the material to be treated directly then treated with saturated steam for 10 minutes at 100 °. Then wash cold and dry.

Claims (4)

Claims 1. Agent for improving the lightfastness of dyeings on polypropylene or base modified polypropylene fibers, characterized in that these contain an ultraviolet ray absorbing substance. 2. The fiber materials treated according to claim 1. 3. Process for dyeing carpets, wholly or partially off Basically modified polypropylene exist, using the means according to Claim 1. 4. The method according to claim 3, characterized in that 0.1 to 6 percent by weight of the ultraviolet rays absorbing from aqueous liquor Substance, calculated on the material to be treated, applies.