CN107619566B - Preparation method of polyvinyl alcohol polarizer - Google Patents
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Abstract
The invention belongs to the technical field of optical materials, and particularly discloses a preparation method of a polyvinyl alcohol polarizer, which comprises the following steps: (1) preparing raw materials; (2) preparing a polyvinyl alcohol solution, and then adding urea and uniformly mixing; (3) preparing a surfactant and an antioxidant into a solution a, and then adding the solution a into a plasticizer to prepare a solution b; (4) preparing potassium iodide and iodine into a solution c; (5) preparing a boric acid aqueous solution; (6) adding the solution b and the solution c into a polyvinyl alcohol solution, and stirring and mixing to obtain a solution d; (7) adding the boric acid aqueous solution into the solution d, and stirring and mixing; (8) stirring the liquid material obtained in the step (7), uniformly mixing, and filtering to prepare a film-making stock solution of the polaroid; (9) the polarizer is prepared from the film-making stock solution. The polaroid with good optical performance can be produced by adopting the scheme.
Description
Technical Field
The invention belongs to the technical field of optical materials, and particularly relates to a preparation method of a polyvinyl alcohol polarizer.
Background
The polarizer is a core component of the liquid crystal panel, mainly functions to convert a circular light source of natural light into a linear light source, and the change of light can be expressed as light and shade change through the polarization effect of the polarizer, so that the purpose of displaying images is achieved. Polarizers are widely used in small-sized instruments such as calculators, inspection instruments, various polarizing microscopes, sunglasses, anti-glare goggles, automobile headlamps and anti-glare devices, and are currently developed for liquid crystal display products such as mobile phones, tablets, computers, liquid crystal televisions, liquid crystal color projectors, liquid crystal monitors, video cameras, vehicle navigation systems, and the like.
The conventional polarizer is produced by mixing water, polyvinyl alcohol, plasticizer, surfactant, antioxidant and other assistants in certain proportion, casting or coating the mixture on a roller or a steel belt after plasticizing to form a film, drying and rolling to prepare a PVA original film, and then washing, swelling, dyeing, stretching and laminating the PVA original film up and down to prepare the polarizer. The method has the advantages of complex process, long production flow, high probability of damage to the film caused by each process, low manufacturing rate of the polaroid and high cost. Patent document CN103724642A discloses a method for preparing a polyvinyl alcohol film for polarizer production, which is to directly add iodine dye into polyvinyl alcohol aqueous solution to mix uniformly and then cast the mixture into a film.
Disclosure of Invention
The invention aims to provide a preparation method of a polyvinyl alcohol polaroid, and the obtained polyvinyl alcohol polaroid has good optical performance and is not easy to stretch and break, so that the preparation rate of the polyvinyl alcohol polaroid is improved.
In order to achieve the purpose, the basic scheme of the invention is as follows: a preparation method of a polyvinyl alcohol polaroid is carried out under the protection of inert gas, and comprises the following steps:
(1) preparing the following raw materials in parts by mass: 100 portions of polyvinyl alcohol, 0.01 to 20 portions of urea, 5 to 25 portions of plasticizer, 0.001 to 0.1 portion of surfactant, 0.0001 to 0.01 portion of antioxidant, 0.001 to 0.01 portion of iodine, 0.01 to 1.0 portion of potassium iodide and 0.001 to 0.1 portion of boric acid;
(2) dissolving polyvinyl alcohol in water to completely dissolve the polyvinyl alcohol in the water to prepare a polyvinyl alcohol solution with the concentration of 15-30%, wherein the pH value of the solution is less than 7; then adding urea, mixing uniformly, and keeping constant temperature at 20-90 ℃ for 0.5-16 h;
(3) mixing a surfactant and an antioxidant together to prepare a solution a with the concentration of 0.01-0.1%, and then adding the solution a into a plasticizer to be uniformly mixed to form a solution b;
(4) preparing potassium iodide and iodine into a solution c of 0.01-30 g/ml;
(5) preparing 0.1-4mol/ml boric acid aqueous solution;
(6) adding the solution b and the solution c into a polyvinyl alcohol solution, and stirring and mixing for 10-30min to obtain a solution d;
(7) adding boric acid water solution into the solution d at 55-100 ℃, and stirring and mixing for 10-30 min;
(8) mechanically stirring the liquid material obtained in the step (7) uniformly, then stirring by ultrasonic waves, and filtering to prepare a film-making stock solution of the polaroid after uniform mixing;
(9) and (3) extruding the film-making stock solution obtained in the step (8) through a die head, casting the film on a roller to form a film, and pre-drying, stretching, drying and rolling the film to form the polarizer through a plurality of pairs of rollers.
The beneficial effect of this basic scheme lies in:
1. the materials for preparing the polyvinyl alcohol polaroid are mixed according to a certain proportion, sequence and mode, so that the related action of hydrophilic and lipophilic groups in the materials is effectively weakened, the dissolution and modification of polyvinyl alcohol are facilitated, the rapid dispersion of auxiliary agents such as a plasticizer, a surfactant, an antioxidant and the like is facilitated, the materials are mixed more uniformly, the tensile stability of a product is improved, the product can be dyed uniformly, the generation of color spots is reduced, and the optical performance of the product is improved.
2. The materials are treated by mechanical stirring, so that the materials can be rapidly macroscopically mixed; then the ultrasonic wave is used for processing the materials, namely the materials can be mixed finely and fully from the microcosmic (molecular level) to finally achieve the molecular microcosmic mixing. The matching use of traditional mechanical stirring and ultrasonic stirring has very big improvement the mixing degree of material.
3. Through the treatment of the steps, all the materials are fully and uniformly mixed at the microscopic molecular level, and the film is uniform and stable in dyeing, good in extensibility, few in color spots and good in optical performance.
4. The conventional method for producing a polarizer is: the PVA original film is prepared firstly, and then the polaroid is prepared through a series of steps, the process is very complex, the polaroid is directly prepared through a one-step method, the process is greatly simplified, and the production efficiency can be improved by 10-50%. In the process of producing the polaroid by adopting the conventional method, the PVA original film and the polaroid are required to be stretched and cut edges in the process of preparing the polaroid, and in the invention, the whole preparation process is stretched for 1 time and cut edges for 1 time, compared with the conventional method, the stretching is carried out for 1 time, so that the probability of product damage is greatly reduced, and the finished product ratio of the polaroid is improved; the edge is cut for 1 time only, so that the loss of materials is reduced by 10-15 percent.
Further, the polyvinyl alcohol adopted in the step (1) is obtained by re-alcoholysis, washing and dehydration. The polyvinyl alcohol is subjected to secondary alcoholysis and washing treatment, complete alcoholysis of the polyvinyl alcohol can be ensured, the polyvinyl alcohol with high regularity and concentrated alcoholysis degree distribution can be easily obtained, and the optical material prepared from the polyvinyl alcohol has high strength and particularly excellent optical performance.
Further, the water content of the polyvinyl alcohol is 35-50%. The water content of the polyvinyl alcohol is controlled to be 35-50%, so that the polyvinyl alcohol can be prevented from being adhered and agglomerated, and the smoothness of subsequent operation can be ensured.
Further, the polymerization degree of the polyvinyl alcohol used is 1500-3000, and the alcoholysis degree is 97-100 mol%. When the polymerization degree and the alcoholysis degree of the polyvinyl alcohol are within the ranges, the strength meets the requirement, the optical performance of the polarizer can be improved, and the production continuity is good.
Furthermore, the purity of the plasticizer is more than or equal to 99.5 percent. When the purity of the plasticizer meets the requirements, the produced polaroid has good performances.
Further, the steps (1) to (8) are all carried out under the protection of inert gas. The polaroid is prepared under the protection of inert gas, so that the material can be prevented from being polluted or oxidized in the production process, and the cleanliness of the material and the quality of the product can be ensured.
Further, the inert gas is nitrogen.
Further, the part of the urea in the step (1) is 0.1-10 parts.
Detailed Description
The selection of raw materials is described below, and the polyvinyl alcohol polarizer is described in detail by taking example 1 as an example, and the comparative example shows only the differences from example 1, and the others are the same as example 1.
The raw material polyvinyl alcohol is obtained by post-treatment, namely re-alcoholysis, full washing and dehydration, and the water content of the polyvinyl alcohol is 35-50%.
Polyvinyl alcohol resins are used for preparing polyvinyl alcohol, and as the polyvinyl alcohol resins, unmodified polyvinyl alcohol resins or modified polyvinyl alcohol resins are generally used, that is, polyvinyl ester resins obtained by solution polymerization of vinyl esters or solution copolymerization of vinyl esters and other modified monomers are subjected to alcoholysis, crushing and pressing to obtain the polyvinyl alcohol resins. Examples of the component copolymerizable with the vinyl ester include unsaturated carboxylic acids or derivatives thereof, unsaturated sulfonic acids or derivatives thereof, vinyl ethers, and c 2-30 alpha-olefins.
Examples of the vinyl ester used in the production of the polyvinyl ester resin include: vinyl acetate, vinyl formate, vinyl laurate, vinyl propionate, vinyl butyrate, vinyl pivalate, vinyl versatate, vinyl stearate, vinyl benzoate, and the like. Such vinyl esters may be one or a combination of two or more of the above, with vinyl acetate being preferred for the purposes of the present invention.
Further, monomers copolymerizable with the vinyl ester are exemplified by: olefins having 2 to 30 carbon atoms such as ethylene, propylene, 1-butene and isobutylene; acrylic acids and their salts, acrylic acids (e.g., -C1-18 alkyl acrylates) such as methyl acrylate, ethyl acrylate, n-butyl acrylate, isobutyl acrylate, t-butyl acrylate, 2-ethylhexyl acrylate, dodecyl acrylate, and octadecyl acrylate; methacrylic acid and its salts, methacrylic acid esters (e.g., C1-18 alkyl methacrylate) such as methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, t-butyl methacrylate, 2-ethylhexyl methacrylate, dodecyl methacrylate, and octadecyl methacrylate; acrylamide derivatives such as acrylamide, N-methylacrylamide, N-ethylacrylamide, N, N-dimethylacrylamide, diacetoneacrylamide, acrylamidopropanesulfonic acid and salts thereof, acrylamidopropyldimethylamine and salts thereof, and N-methylolacrylamide and derivatives thereof; methacrylamide derivatives such as methacrylamide, N-methylmethacrylamide, N-ethylmethacrylamide, methacrylamidepropanesulfonic acid and salts thereof, methacrylamidopropyldimethylamine and salts thereof, N-methylolmethacrylamide and derivatives thereof, and N-vinylamides such as N-vinylformamide, N-vinylacetamide, and N-vinylpyrrolidone; vinyl ethers such as methyl vinyl ether, ethyl vinyl ether, n-propyl vinyl ether, isopropyl vinyl ether, n-butyl vinyl ether, isobutyl vinyl ether, tert-butyl vinyl ether, dodecyl vinyl ether, and stearyl vinyl ether; nitriles such as acrylonitrile and methacrylonitrile; halogenated vinyls such as a chlorinated vinyl group, a chlorinated vinylidene group, a fluorinated vinyl group and a fluorinated vinylidene group; allyl compounds such as allyl acetate and allyl chloride; unsaturated carboxylic acids such as maleic acid and itaconic acid, and salts and esters thereof; vinyl silyl compounds such as vinyltrimethoxysilane; isopropyl acetate; the above-mentioned copolymerizable monomer is preferably an a-olefin, and particularly preferably ethylene.
The above-mentioned monomers copolymerizable with the vinyl esters are preferably used in amounts of less than 10%, more preferably less than 5%, in terms of mole percent.
The raw material polyvinyl alcohol of the invention is obtained by carrying out post-treatment (further alcoholysis and water washing purification) on the water-containing polyvinyl alcohol resin obtained by the vinyl ester polymerization, alcoholysis, crushing and squeezing.
The plasticizer, which is a raw material of the present invention, is usually a polyhydric alcohol, and examples thereof include glycerin such as glycerin, diglycerin, and triglycerin, alkylene glycols or polyalkylene glycols such as ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, and polypropylene glycol, and trimethylolpropane. These plasticizers may be used alone or in combination of two or more. Glycerol is preferred in the present invention to ensure the extensibility of the film.
In general, surfactants have a blocking effect in film curling, and for example, anionic surfactants may be used alone or nonionic surfactants may be used alone or in combination.
The raw material-surfactant of the present invention can be exemplified by: examples of the carboxylic acid type include potassium laurate and the like, sulfuric acid ester type such as octylsalicylate and the like, sulfonic acid type such as dodecylbenzenesulfonate and the like, and alkyl ether type such as polyoxyethylene oleyl ether and the like, alkyl benzene ether type such as polyoxyethylene octylphenyl ether and the like, alkyl ester type such as polyoxyethylene lauric acid and the like, polypropylene glycol ether type such as polyoxyethylene polyoxypropylene and the like, alkanolamide type such as oleic acid diethanolamide and the like, polyoxyalkylene allyl benzene ether type and the like are mentioned.
The raw material antioxidant of the present invention may be any antioxidant such as a phenol-based antioxidant, 2, 6-di-t-butyl-p-cresol, 2-methylenebis (4-methyl-6-t-butylphenol), pentaerythritol tetrakis [3- (3, 5-di-t-butyl-4-hydroxyphenyl) propionate ], tris (2, 4-di-t-butylphenyl) phosphite, or the like, and preferably a combination of the latter two or three.
Example 1
The implementation discloses a preparation method of a polyvinyl alcohol polaroid, wherein membrane preparation stock solution for preparing the polyvinyl alcohol polaroid is carried out under the protection of nitrogen, and the preparation method comprises the following steps:
(1) preparing the following raw materials in parts by mass: 100 parts of polyvinyl alcohol, 10 parts of urea, 12 parts of plasticizer, 0.08 part of surfactant, 0.002 part of antioxidant, 0.005 part of iodine, 0.1 part of potassium iodide and 0.01 part of boric acid;
(2) dissolving polyvinyl alcohol in water to completely dissolve the polyvinyl alcohol in the water to prepare a polyvinyl alcohol solution with the concentration of 20%, wherein the pH value of the solution is 6.2; then adding urea, mixing uniformly, and keeping the constant temperature at 50 ℃ for 3 h;
(3) mixing a surfactant and an antioxidant together to prepare a solution a with the concentration of 0.05%, and then adding the solution a into a plasticizer to be uniformly mixed to form a solution b;
(4) preparing potassium iodide and iodine into a solution c of 5 g/ml;
(5) preparing 0.5mol/ml boric acid aqueous solution;
(6) adding the solution b and the solution c into a polyvinyl alcohol solution, and stirring and mixing for 30min to obtain a solution d;
(7) adding the boric acid aqueous solution into the solution d at the temperature of 60 ℃, and stirring and mixing for 15 minutes;
(8) mechanically stirring the liquid material obtained in the step (7) uniformly by using a paddle stirrer, then stirring by using ultrasonic waves, and filtering the uniformly mixed liquid material to prepare a film-making stock solution of the polaroid;
(9) and (3) extruding the film-making stock solution obtained in the step (8) through a die head, casting the film on a roller to form a film, and then pre-drying, stretching, drying and rolling the film to form the polarizer through a plurality of pairs of rollers.
Example 2
The implementation discloses a preparation method of a polyvinyl alcohol polaroid, membrane preparation stock solution for preparing the polyvinyl alcohol polaroid is carried out under the protection of nitrogen, and the preparation method comprises the following steps:
(1) preparing the following raw materials in parts by mass: 100 parts of polyvinyl alcohol, 0.1 part of urea, 15 parts of plasticizer, 0.09 part of surfactant, 0.003 part of antioxidant, 0.008 part of iodine, 0.5 part of potassium iodide and 0.05 part of boric acid;
(2) dissolving polyvinyl alcohol in water to completely dissolve the polyvinyl alcohol in the water to prepare a polyvinyl alcohol solution with the concentration of 30%, wherein the pH value of the solution is 6.0; then adding urea, mixing uniformly, and keeping the constant temperature at 80 ℃ for 1 h;
(3) mixing a surfactant and an antioxidant together to prepare a solution a with the concentration of 0.1%, and then adding the solution a into a plasticizer to be uniformly mixed to form a solution b;
(4) preparing solution c of potassium iodide and iodine in 15 g/ml;
(5) preparing a boric acid aqueous solution with the concentration of 2 mol/ml;
(6) adding the solution b and the solution c into a polyvinyl alcohol solution, and stirring and mixing for 30min to obtain a solution d;
(7) adding the boric acid aqueous solution into the solution d at 70 ℃, and stirring and mixing for 20 min;
(8) mechanically stirring the liquid material obtained in the step (7) uniformly by using a traditional paddle stirrer, then stirring by using ultrasonic waves, and filtering after uniform mixing to prepare a film-making stock solution of the polaroid;
(9) and (3) extruding the film-making stock solution obtained in the step (8) through a die head, casting the film on a roller to form a film, and then pre-drying, stretching, drying and rolling the film to form the polarizer through a plurality of pairs of rollers.
Example 3
The implementation discloses a preparation method of a polyvinyl alcohol polaroid, membrane preparation stock solution for preparing the polyvinyl alcohol polaroid is carried out under the protection of nitrogen, and the preparation method comprises the following steps:
(1) preparing the following raw materials in parts by mass: 100 parts of polyvinyl alcohol, 0.05 part of urea, 24 parts of plasticizer, 0.1 part of surfactant, 0.005 part of antioxidant, 0.01 part of iodine, 1.0 part of potassium iodide and 0.1 part of boric acid;
(2) dissolving polyvinyl alcohol in water to completely dissolve the polyvinyl alcohol in the water to prepare a polyvinyl alcohol solution with the concentration of 30%, wherein the pH value of the solution is 5.5; then adding urea, mixing uniformly, and keeping constant temperature at 30 ℃ for 16 h;
(3) mixing a surfactant and an antioxidant together to prepare a solution a with the concentration of 0.1%, and then adding the solution a into a plasticizer to be uniformly mixed to form a solution b;
(4) preparing solution c of potassium iodide and iodine with the concentration of 30 g/ml;
(5) preparing a boric acid aqueous solution with the concentration of 4 mol/ml;
(6) adding the solution b and the solution c into a polyvinyl alcohol solution, and stirring and mixing for 30min to obtain a solution d;
(7) adding the boric acid aqueous solution into the solution d at 90 ℃, and stirring and mixing for 30 min;
(8) uniformly stirring the liquid material obtained in the step (7) by using a traditional paddle stirrer, then stirring by using ultrasonic waves, and filtering after uniform mixing to prepare a film-making stock solution of the polaroid;
(9) and (3) extruding the film-making stock solution obtained in the step (8) through a die head, casting the film on a roller to form a film, and then pre-drying, stretching, drying and rolling the film to form the polarizer through a plurality of pairs of rollers.
Comparative example 1
This comparative example differs from example 1 in that: in the step (3), a surfactant, an antioxidant and a plasticizer are directly added into the polyvinyl alcohol solution in the step (2).
By comparing the polarizer prepared in comparative example 1 with the polarizer prepared in example 1, it was found that the polarizer prepared in comparative example 1 had significantly more defects, more color spots, and poor optical properties. The reason is that: the amount of the surfactant and the antioxidant is very small, and if the surfactant and the antioxidant are directly put into the polyvinyl alcohol solution, the surfactant and the antioxidant are easy to agglomerate and are not uniformly dispersed, so that the quality of the subsequently manufactured polaroid is influenced.
Comparative example 2
This comparative example differs from example 1 in that: in the step (8), the liquid material obtained in the step (7) is stirred only by a traditional paddle stirrer.
It was found by comparing the polarizer prepared in comparative example 2 with the polarizer prepared in example 1 that the polarizer prepared in comparative example 2 had more spots and had poorer optical properties. The reason is that the materials are only mixed macroscopically, so that the materials are not uniformly dispersed, and the produced polaroid has more color spots and poor optical performance.
Comparative example 3
This comparative example differs from example 1 in that: in the step (8), the liquid material obtained in the step (7) is mixed only by using an ultrasonic mixer.
By comparing the polarizer prepared in comparative example 3 with the polarizer prepared in example 1, it was found that the polarizer prepared in comparative example 3 had much color unevenness and poor optical properties. The reason is that the materials are not macroscopically mixed, the materials are not thoroughly mixed, and the materials in the film-making stock solution are not uniformly dispersed, so that the polaroid produced by the film-making stock solution generates more color spots, and the optical performance of the polaroid is seriously influenced.
Comparative example 4
And the comparative example 4 adopts a conventional preparation method to produce the polaroid, namely, auxiliary agents such as water, polyvinyl alcohol, a plasticizer, a surfactant, an antioxidant and the like are dissolved and mixed according to a certain proportion, then the mixture is cast or coated on a roller or a steel belt to form a film, and the film is dried and wound to prepare a PVA original film, and then the PVA original film is washed, swelled, dyed, stretched and coated with upper and lower films to prepare the polaroid.
Comparing the polarizers produced in comparative example 4 and example 1: the polaroid prepared by the method in the embodiment 1 has less color spots and better optical performance in terms of product performance; from the aspect of cost: the yield is higher, the material loss is smaller, and the material loss is reduced by 10-15%; and the production efficiency can be improved by 10-50% in terms of production efficiency. The reason is that: the conventional method is adopted to produce the polaroid, the PVA original film is required to be prepared firstly, then the polaroid is required to be prepared, the process is long, the process is complex, the production efficiency is reduced, the PVA original film is required to be stretched and cut into edges when being prepared, the polaroid is required to be stretched and cut into edges when being prepared, the product is easy to break in the secondary stretching process, the raw material loss is large, and the production efficiency is influenced.
Claims (5)
1. A preparation method of a polyvinyl alcohol polarizer is characterized by comprising the following steps:
(1) preparing the following raw materials in parts by mass: 100 portions of polyvinyl alcohol, 0.01 to 20 portions of urea, 5 to 25 portions of plasticizer, 0.001 to 0.1 portion of surfactant, 0.0001 to 0.01 portion of antioxidant, 0.001 to 0.01 portion of iodine, 0.01 to 1.0 portion of potassium iodide and 0.001 to 0.1 portion of boric acid; the polyvinyl alcohol is obtained by re-alcoholysis, washing and dehydration, and the water content of the polyvinyl alcohol is 35-50%;
(2) dissolving polyvinyl alcohol in water to completely dissolve the polyvinyl alcohol in the water to prepare a polyvinyl alcohol solution with the concentration of 15-30%, wherein the pH value of the solution is less than 7; then adding urea, mixing uniformly, and keeping constant temperature at 20-90 ℃ for 0.5-16 h;
(3) preparing a solution a with the concentration of 0.01-0.1% by using a surfactant and an antioxidant, and then adding the solution a into a plasticizer to be uniformly mixed to form a solution b;
(4) preparing potassium iodide and iodine into a solution c of 0.01-30 g/ml;
(5) preparing 0.1-4mol/ml boric acid aqueous solution;
(6) adding the solution b and the solution c into a polyvinyl alcohol solution, and stirring and mixing for 10-30min to obtain a solution d;
(7) adding boric acid water solution into the solution d at 55-100 ℃, and stirring and mixing for 10-30 min;
(8) mechanically stirring the liquid material obtained in the step (7) uniformly, then stirring by ultrasonic waves, and filtering to prepare a film-making stock solution of the polaroid after uniform mixing; the steps (1) to (8) are all carried out under the protection of inert gas;
(9) and (3) extruding the film-making stock solution obtained in the step (8) through a die head, casting the film on a roller to form a film, and pre-drying, stretching, drying and rolling the film to form the polarizer through a plurality of pairs of rollers.
2. The method of claim 1, wherein the degree of polymerization of the polyvinyl alcohol is 1500-3000, and the degree of alcoholysis is 97-100 mol%.
3. The method of preparing a polyvinyl alcohol polarizer according to claim 1, wherein the purity of the plasticizer used is not less than 99.5%.
4. The method of manufacturing a polyvinyl alcohol polarizer according to claim 1, wherein the inert gas is nitrogen.
5. The method of preparing a polyvinyl alcohol polarizer according to claim 1, wherein the urea is present in an amount of 0.1 to 10 parts in the step (1).
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| CN109370130B (en) * | 2018-10-31 | 2021-07-02 | 中国石油化工股份有限公司 | Preparation method of high-concentration low-viscosity polyvinyl alcohol melt and film thereof |
| CN109438734B (en) * | 2018-10-31 | 2021-08-27 | 中国石油化工股份有限公司 | Polyvinyl alcohol film with good durability and preparation method thereof |
| CN112721258A (en) * | 2020-12-29 | 2021-04-30 | 合肥德瑞格光电科技有限公司 | Preparation method of polyvinyl alcohol polarizing film for TFT |
| CN116100839B (en) * | 2023-03-09 | 2024-07-09 | 合肥德瑞格光电科技有限公司 | Preparation method of light and thin polarizer original sheet |
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| CN103744141B (en) * | 2013-12-25 | 2016-07-20 | 云南云天化股份有限公司 | A kind of preparation method of Pva Polarizing Film |
| KR101892333B1 (en) * | 2015-04-15 | 2018-08-27 | 삼성에스디아이 주식회사 | Optical film and display device comprising the same and method for preparing the optical film |
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