CN102998721A

CN102998721A - Method for coating diffusion film coating

Info

Publication number: CN102998721A
Application number: CN2012105795561A
Authority: CN
Inventors: 任乃飞; 葛小兵; 吴迪富; 任旭东; 孙玉娟; 刘丹; 陈明阳; 孙兵
Original assignee: JIANGSU YUDI OPTICAL CO Ltd; Jiangsu University
Current assignee: JIANGSU YUDI OPTICAL CO Ltd
Priority date: 2012-12-28
Filing date: 2012-12-28
Publication date: 2013-03-27
Anticipated expiration: 2032-12-28
Also published as: CN102998721B

Abstract

The invention discloses a method for coating a diffusion film coating and relates to the field of optical thin films of the plane display technology. The method comprises steps of cleaning and drying a substrate, coating an anti-scraping layer which is made of an anti-scraping layer material in advance, drying the anti-scraping layer, coating the diffusion film coating to the surface of the anti-scraping layer, and conducting infrared ray drying and drying. The method is a novel coating method and the good diffusion film coating can be prepared.

Description

A kind of painting method of diffusion barrier coating

Technical field

The present invention relates to field of optical films in the flat panel display, particularly a kind of painting method route that applies the diffusion barrier coating for flat panel display at substrate.

Background technology

Three large major fields of modern high technology are material, the energy and information science.They constantly propose new performance requirement to material.In recent years, thin film technique had had the progress of advancing by leaps and bounds along with high-tech development.Because coating technique, membraneous material, surface physics three's mutual propelling and combination so that thin film technique becomes a comprehensive applied science, are the new emphasis of from now on industrial development.In some developed countries, thin film technique is applied by comprehensive.Except development optical thin film integrated circuit film, liquid crystal display film, disk, CD film, also produce in a large number cutter hard films, sun power film, gas sensor film, plastic-metal goods, building glass membrane product, various decorating film and volume plating film products etc.Why film becomes the focus of research, and has broad application prospects, and is closely related with the following characteristics of membraneous material:

In many situations, performance and the effect of material function occur in material surface.Such as physical chemical phenomenons such as chemical catalysis, optical reflection, field emission, thermoelectron effusions.Use film material with function than the not only resources conseravtion of use body block functional material, and reduce cost.Membraneous material often has the not available performance of some its block materials.This is that membraneous material is in metastable state easily because membraneous material forms thin brilliant, noncrystalline state easily, and film is the nonstoichiometry ratio often, special material surface energy state etc.

Film plating process has wet method and dry method.Wet method comprises electroplates and electroless plating.Dry method comprises chemical vapour deposition technique (CVD) and physical vaporous deposition (PVD).Thin film technology often adopts PVD method and CVD method.The PVD method is with METAL HEATING PROCESS gasification, by between the gaseous atom or and do between the inert atom of protection gas collision and be caught to combine in to prepare film on the base material under vacuum or ultravacuum.The CVD method is to utilize the thermal decomposition of gaseous substance, thermal synthesis or chemistry transmission etc. to generate the rete of solid deposited at base material.General depositing temperature up to 1000e about, some material is unable to bear high temperature, but using plasma chemical vapour deposition technique then.It is to promote chemical reaction with gas discharge plasma, can operate (500-600e) under lower temperature like this.The CVD method comprises the chemical vapor deposition (MOCVD) of metallorganics and metallorganics plasma activated chemical vapour deposition (MOPCVD) etc.Colloidal sol-gel method plated film gets more and more people's extensive concerning in recent years, the advantages such as it has, and production cost is relatively low, plated film efficient height, plated film good uniformity.The research of its application is very active, at development, the material modification of new material and widen and also play an important role aspect the purposes.

Thin film coated is a kind of important Modern Surface Engineering Technology.The chemical constitution of coat, institutional framework can be fully different with matrix material.Coated film thickness is very little and dimension precision requirement is very high, can play the effect of 3 aspects: the optimizing surface performance, carry out microfabrication and produce new functional material.But film often often fold can occur in coating procedure, striped, and the defective such as bubble.The thin film coated machining process has important impact to the quality of forming thin film, yet most of researchists mainly are preparation and the forming method of Study of Thin coating, and the machining process route of the coating of film research is less, and therefore the research of the complete painting method of film coating being seemed is even more important.

The inventive method is exactly for some defectives occur easily at present in the coating procedure of film, in the coating processes process of optical thin film, also do not form a good complete coating processes job operation, proposed a kind of painting method that applies a kind of diffusion barrier coating at substrate.

Summary of the invention

The purpose of the inventive method provides a kind of coating job operation of optical diffusion, produce a kind of good optical thin film, avoid occurring in the film forming process some defectives, yield rate is high, film-formation result is good, thereby improves the utilization factor of membraneous material and the functional effect of enhanced film.

To achieve these goals, the technical solution used in the present invention is at first to adopt the method for Ultrasonic Cleaning to clean to light guide plate, then carry out the anti-scratch layer that the anti-scratch material of precoating layer forms on its surface, and it is carried out drying process, apply one deck optical diffusion coating on this anti-scratch layer surface again, at last it is carried out infrared drying and dry the processing.Whole coating procedure provides realistic basis for preparing good optical thin film.Concrete grammar is as follows:

1. Ultrasonic Cleaning: with light guide plate to be cleaned in inlet conveyor is sent to ultrasonic cleaning equipment, when substrate from rinse bath by and in cleaning fluid (pure water) during immersion, the substrate upper and lower surface just can be cleaned simultaneously.This is because the ultrasound wave vibration plate is equipped with in the bottom of rinse bath, ultrasonic frequency is controlled in the 28KHz-40KHz scope, utilize the cavitation in the hole that the ultrasound wave in this frequency range produces in water that the dirt on the substrate is removed, the moment of breaking in the hole can be emitted huge energy and be impacted forming around the hole, the dirt film of substrate surface is broken up and reaches the effect of decontamination.Facts have proved and remove in this way big-and-middle size to adhere to particle very effective.

2. precoating: apply the anti-scratch layer that the anti-scratch material of one deck forms at glass substrate, adopt the intaglio printing mode to apply, then the THICKNESS CONTROL of this anti-scratch layer carries out drying and processing with drying baker under 55 ℃-70 ℃ between 1um-2um.This anti-scratch layer has very stronger hardness and anti-scratch ability, when diffusion barrier and light guide plate contact, can effectively protect diffusion barrier not by scratch.

3. diffusion barrier applies: diffusion layer material adopts and sneak into diffusion particle silicon dioxide in the aromatic series saturated polyester, and the ratio of aromatic series saturated polyester and diffusion particle silicon dioxide is 10:0.8-10:1.5.At first prepare diffusion layer and apply emulsion, then utilize reverse gravure roll coating method to apply, the THICKNESS CONTROL of coating is between 2um-3um.This coating method is no matter in the homogeneity that applies, measurement accuracy, or there is very large advantage the speed aspect.

4. dry: as in order to guarantee good drying, also to be simultaneously the crystalline rate that reaches maximum in order helping, the coating surface temperature to be maintained in 80 ℃ of-125 ℃ of scopes.Suitable drying means is the key that obtains good coat.The most effective dry means are that infrared heating and dielectric heating combine, and adopt gradient-heated and gradient cooling means, i.e. the temperature section of coating surface increase, segmentation cooling.The last stage is adopted infrared heating, then by medium heated at high speed air, makes the diffusion barrier coating be in the constant rate of speed heating period, uses at last infrared heating again.Finish moisture content and all remove coalescent with film.Last behind the heat drying, coat film is cooled to below 32 ℃, is preferably between 24 ℃-30 ℃, prevents from being stained with dust or self-adhesion occurs.

The innovation of painting method of the present invention is in the preparation field of optical thin film, and a kind of novel thin film coated adding method is provided, and utilizes the method to apply out good functional film at substrate, thereby makes it have good performance requirement.

Advantage of the present invention:

1. substrate is carried out Ultrasonic Cleaning, this cleaning method can be removed stronger adhering contaminant on the substrate, haves laid a good foundation thereby process for subsequent coated.

2. apply the anti-scratch layer that the anti-scratch material of one deck forms between substrate and diffusion barrier coating, this anti-scratch layer can effectively stop the wearing and tearing of diffusion particle in substrate and the diffusion barrier (silicon dioxide), thereby effectively raises the diffusion effect of diffusion barrier.

3. diffusion barrier apply to adopt reverses the gravure roll coating method and applies, and no matter this coating method is in the homogeneity that applies, measurement accuracy, or there is very large advantage the speed aspect.

4. will obtain good coat just must have suitable drying means, adopts infrared heating and dielectric heating to combine in this method, and employing gradient-heated and gradient cooling means, and this drying means is the key that obtains good film coating.

5. this coating of inventing as diffusion barrier provides a cover complete painting method route, thereby provides a kind of realistic basis for obtaining good diffusion barrier coating.

Description of drawings

Fig. 1 is the coating job operation process flow diagram that applies one deck diffusion barrier at the light guide plate substrate.

Embodiment

To apply diffusion barrier as example at the light guide plate substrate, this method method flow diagram as shown in Figure 1, concrete steps are: the first step, Ultrasonic Cleaning, with TFT-LCD glass substrate to be cleaned in inlet conveyor is sent to ultrasonic cleaning equipment, ultrasonic frequency is controlled at 28KHz-40KHz, transporting velocity is 3m/min, and the pure water flow is 30L/min, at this moment, clean best results, then about 60 ℃, carry out drying and processing with drying baker.Second step, precoating applies the anti-scratch layer that the anti-scratch material of one deck forms at glass substrate, adopts the intaglio printing mode to apply, and the THICKNESS CONTROL of this anti-scratch layer is between 1um-2um.In the 3rd step, drying after precoating is finished, is carried out drying and processing with drying baker under 55-70 ℃.The 4th step, diffusion barrier applies, and at first preparation applies emulsion, and its proportioning that applies each composition of emulsion is 10:1:0.5:0.36:3, concrete configuration is weighing as follows: aromatic series saturated polyester 50kg, silicon dioxide 5kg, resin wax 2.5kg, algae emulsion 1.8kg, ion exchange water 15kg, after choosing weighing on request, first aromatic series saturated polyester emulsion is added in the dosage bunker, add again resin wax.Resin is cured be first with resin cured add concentration that pure water is mixed be 30% the cured solution of resin after add again silicon dioxide, after stirring, add the algae emulsion with concentration 75%, the rear adding ion exchange water that stirs has just become used coating emulsion.Then will apply emulsion adopts reverse gravure roll coating method to apply.The 5th step, drying, after coating was finished, the coating emulsion was carried out infrared drying after applying well on bonding agent, can carry out in infared dryer, uses 90-120 ℃ of heated-air drying again, cools off under 30 ℃ afterwards.The coating of whole film is finished.

Claims

1. the painting method of a diffusion barrier coating, it is characterized in that: utilize first ultrasound wave that substrate is cleaned, it is carried out drying and processing, then carry out the drying processing at the anti-scratch layer of the anti-scratch material composition of substrate surface precoating layer and to it, utilize on anti-scratch layer surface again and reverse gravure roll coating method coating one deck diffusion barrier, utilize at last infrared heating and dielectric heating to combine, and adopt gradient-heated and gradient cooling means that it is carried out drying and process.

2. a kind of painting method based on the diffusion barrier coating according to claim 1 is characterized in that: specifically may further comprise the steps:

A) Ultrasonic Cleaning: with light guide plate to be cleaned in inlet conveyor is sent to ultrasonic cleaning equipment, when substrate from rinse bath by and when in cleaning fluid, soaking, the substrate upper and lower surface is cleaned simultaneously;

B) precoating: apply the anti-scratch layer that the anti-scratch material of one deck forms at glass substrate, adopt the intaglio printing mode to apply, then the THICKNESS CONTROL of this anti-scratch layer carries out drying and processing with drying baker under 55-70 ℃ between 1um-2um;

C) diffusion barrier applies: diffusion layer material adopts and sneak into diffusion particle silicon dioxide in the aromatic series saturated polyester, and the ratio of aromatic series saturated polyester and diffusion particle silicon dioxide is 10:0.8-10:1.5; At first prepare diffusion layer and apply emulsion, then utilize and reverse gravure roll coating method coating diffusion layer coating emulsion coating, the THICKNESS CONTROL of diffusion barrier coating is between 2um-3um;

D) drying: infrared heating and dielectric heating combine, and adopt gradient-heated and gradient cooling, i.e. the temperature section of coating surface increase, segmentation cooling maintain in 80 ℃ of-125 ℃ of scopes the coating surface temperature.

3. the painting method of a kind of diffusion barrier coating according to claim 2, it is characterized in that: described step D), the last stage is adopted infrared heating, then by medium heated at high speed air, make the diffusion barrier coating be in the constant rate of speed heating period, use again at last infrared heating, finish moisture content and all remove coalescent with film; Last behind the heat drying, coat film is cooled to below 32 ℃.

4. the painting method of a kind of diffusion barrier coating according to claim 3 is characterized in that: last behind the heat drying, coat film is cooled between 24 ℃-30 ℃.

5. the painting method of a kind of diffusion barrier coating according to claim 2, it is characterized in that: described steps A), the ultrasound wave vibration plate is equipped with in the bottom of rinse bath, ultrasonic frequency is controlled in the 28KHz-40KHz scope, utilize the cavitation in the hole that the ultrasound wave in this frequency range produces in water that the dirt on the substrate is removed, the moment of breaking in the hole emits huge energy and impacts forming around the hole, and the dirt film of substrate surface is broken up and the cleaning base plate upper and lower surface.

6. according to claim 2 or 5 described a kind of painting methods based on the diffusion barrier coating, it is characterized in that: described steps A), cleaning fluid is pure water.

7. according to claim 1, the painting method of 2 or 3 described a kind of diffusion barrier coatings, it is characterized in that: described step C), the preparation method that described diffusion layer applies emulsion is: at first with aromatic series saturated polyester, silicon dioxide, resin wax, algae emulsion and ion exchange water according to mass ratio 10:1:0.5:0.36:3 weighing; After the weighing, first aromatic series saturated polyester emulsion is added in the dosage bunker, add again resin wax; Resin is cured be first with resin cured add concentration that pure water is mixed be 30% the cured solution of resin after, add again silicon dioxide, after stirring, add the algae emulsion with concentration 75%, the rear adding ion exchange water that stirs has just become used coating emulsion to be.