CN107619566A - A kind of preparation method of polyvinyl alcohol polaroid - Google Patents
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Abstract
The present patent application belongs to optical material technical field, specifically discloses a kind of preparation method of polyvinyl alcohol polaroid, comprises the following steps：（1）Prepare raw material；（2）Poly-vinyl alcohol solution is prepared, urea is then added and is well mixed；（3）Surfactant and antioxidant are configured to solution a, then solution a is added in plasticizer solution b is made；（4）KI and iodine are configured to solution c；（5）Prepare boric acid aqueous solution；（6）Solution b, solution c are added in poly-vinyl alcohol solution, are stirred to obtain solution d；（7）Boric acid aqueous solution is added in solution d, is stirred；（8）To step（7）The liquid material of acquisition is stirred, and is prepared into the film stoste of polaroid after well mixed through filtering；（9）Polaroid is made using stoste is film-made.The polaroid of good in optical property can be produced using this programme.
Description
Technical field
The invention belongs to optical material technical field, more particularly to a kind of preparation method of polyvinyl alcohol polaroid.
Background technology
Polaroid is the core component of liquid crystal panel, and main function is that the circle light source of natural light is converted into line source, light
The change of line can show as the change of light and shade by the polarization of polaroid, so as to reach the purpose of display image.Polarisation
Piece is widely used in calculator, instrumentation, various polarizing microscopes, sunglasses, anti-glare eye protector, auto bulb anti-glare dress
The miniature instrument such as put, be currently advancing to be used for mobile phone, flat board, computer, LCD TV, color liquid crystal projecting apparatus, LCD monitor,
The liquid crystal display products such as video camera, onboard navigation system.
The production method of conventional polarizers is to help water, polyvinyl alcohol, plasticizer, surfactant, antioxidant etc. at present
Agent mixes by a certain percentage, after plasticizing on roller or steel band curtain coating or coating film forming and through dry and winding PVA original films are made,
Polaroid is made by washing, swelling, dyeing, stretching, upper and lower overlay film in PVA originals film again.This method complex procedures, production procedure
It is long, and each operation causes the probability of damage big to film, cause that the row yielding of polaroid is low, cost is high.Publication No.
CN103724642A patent document discloses a kind of preparation of the polyvinyl alcohol film for polaroid production, and the preparation of the film is
Iodine stain is added directly into casting film-forming after being well mixed in polyvinyl alcohol water solution, although this method is simple, this method
The film of acquisition can cause that film yellow is serious, color spot is more, stability because of poor plasticity, the iodine based dye mixing factor such as uneven
Difference, make Film Optics hydraulic performance decline, and stretch easy fracture.
The content of the invention
The purpose of the present invention is providing a kind of preparation method of polyvinyl alcohol polaroid, obtained polyvinyl alcohol polaroid light
It is good to learn performance, and is not easy tension failure, improves the row yielding of polyvinyl alcohol polaroid.
In order to achieve the above object, base case of the invention is：A kind of preparation method of polyvinyl alcohol polaroid, prepare
Polyvinyl alcohol polaroid is carried out under the protection of inert gas, is comprised the following steps：
(1) raw material of following mass fraction is prepared：100 parts of polyvinyl alcohol, urea 0.01-20 parts, plasticizer 5-25 parts, table
Face activating agent 0.001-0.1 parts, antioxidant 0.0001-0.01 parts, iodine 0.001-0.01 parts, KI 0.01-1.0 parts, boric acid
0.001-0.1 parts；
(2) polyvinyl alcohol is dissolved in water, polyvinyl alcohol is dissolved the poly- second for completely, being made that concentration is 15-30% in water
Enolate solution, pH value of solution ＜ 7；Then add urea to be well mixed, and constant temperature keeps 0.5-16h at 20-90 DEG C；
(3) it is the solution a that concentration is 0.01-0.1% by surfactant and the common mixed preparing of antioxidant, then will be molten
Liquid a, which adds to be well mixed in plasticizer, forms solution b；
(4) KI and iodine are configured to 0.01-30g/ml solution c；
(5) compound concentration is 0.1-4mol/ml boric acid aqueous solution；
(6) solution b, solution c are added in poly-vinyl alcohol solution, are stirred 10-30min and obtain solution d；
(7) at 55-100 DEG C, boric acid aqueous solution is added in solution d, is stirred 10-30min；
(8) stirred again using ultrasonic wave after the liquid material elder generation machinery obtained to step (7) stirs, after being well mixed
The filtered film stoste for being prepared into polaroid；
(9) the film stoste that step (8) obtains is extruded by die head, the casting film-forming on roller, then through more pair roller barrels
Predrying, stretching is carried out, dries, be wound into polaroid.
The beneficial effect of this base case is：
1st, prepare the material of polyvinyl alcohol polaroid by a certain percentage, order and mode mixed, effectively weaken
The dependent interaction of hydrophilic lipophilic group in each material, beneficial to the dissolving and modification of polyvinyl alcohol, and be advantageous to plasticizer, surface
The rapid dispersion of the auxiliary agents such as activating agent, antioxidant, make material mixing more uniform, improve the drawing stability of product so that production
Product can even dyeing, reduce the generation of color spot, improve the optical property of product.
2nd, material is handled using mechanical agitation, material can be made quickly to carry out micromixing；Reuse ultrasonic wave pair
Material is handled, i.e., and can makes material be mixed from microcosmic (molecular level) fine and smooth, abundant, finally reaches the microcosmic of molecular level
Mixing.Tradition machinery stirs and the collocation of ultrasonic wave stirring uses, and greatly improves the degree of mixedness of material.
3rd, abundant mixing has been carried out in micro molecule level by the processing of above-mentioned steps, each material, dyeing films are equal
It is even and stably, good-extensibility, color spot is few, optical property is good.
4th, the conventional method of production polaroid is：PVA original films are first prepared, polarisation then is made by series of steps again
Piece, technique is sufficiently complex, and is directly prepared into polaroid using one-step method in the present invention, and technique is greatly simplified, production effect
Rate can improve 10-50%.During producing polaroid using conventional method, during preparing PVA originals film and polaroid
It is both needed to be stretched and cutting edge, and in the present invention, whole preparation process only stretches 1 time, cutting edge 1 time, compares and conventional method,
Only stretching 1 time, the probability of damaged products is greatly reduced, improve the yield rate of polaroid；Cutting edge 1 time, reduces material
Loss, material loss reduces 10-15%.
Further, the polyvinyl alcohol used in step (1) is by alcoholysis again and washing and is dehydrated acquisition.Polyvinyl alcohol is carried out
Alcoholysis and carrying out washing treatment again, polyvinyl alcohol complete alcoholysis can be ensured, it is high, alcoholysis degree distribution concentration to be readily available regularity
Polyvinyl alcohol, its intensity of the optical material height prepared by the polyvinyl alcohol, optical property are especially excellent.
Further, the water content of the polyvinyl alcohol is 35-50%.The water content of polyvinyl alcohol is controlled in 35-50%,
It can ensure that polyvinyl alcohol will not be inter-adhesive, bonding is agglomerating, it is ensured that the smoothness of subsequent operation.
Further, the degree of polymerization of polyvinyl alcohol used is 1500-3000, alcoholysis degree 97-100mol%.Polyvinyl alcohol
The degree of polymerization and alcoholysis degree within the above range when, intensity meets to require, and can improve the optical property of polaroid, the company of production
Continuous property is good.
Further, plasticizer purity >=99.5% used.When the purity of plasticizer meets above-mentioned requirements, the polaroid of production
Properties are preferable.
Further, the step (1)-step (8) is carried out under the protection of inert gas.In the protection of inert gas
Under prepare polaroid, material can be prevented during production contaminated or oxidation, can guarantee that the cleanliness factor and product of material
Quality.
Further, the inert gas is nitrogen.
Further, the number of urea is 0.1-10 parts in the step (1).
Embodiment
Raw material is selected below and is illustrated, and describes polyvinyl alcohol polaroid, comparative example in detail by taking embodiment 1 as an example
Only show with the difference of embodiment 1 in place of, other are unshowned same as Example 1.
The material polyethylene alcohol of the present invention is by post processing, i.e., washs by alcoholysis again and fully and be dehydrated acquisition,
The water content of the polyvinyl alcohol is 35-50%.
Prepare polyvinyl alcohol and use polyvinyl alcohol resin, as polyvinyl alcohol resin, usually using unmodified poly- second
Enol system resin or modified polyvinylalcohol system resin, i.e. by vinyl esters by polymerisation in solution or vinyl esters and other modifications
The polyvinyl ester that monomer carries out solution copolymerization acquisition obtains polyvinyl alcohol resin by alcoholysis, crushing, squeezing.As
Can with the composition of vinyl esters combined polymerization, such as can be enumerated as undersaturated carboxylic acid or derivatives thereof, unsaturated sulfonic acid or its spread out
Penetrate thing, vinyl ethers, carbon number 2-30 a- alkene etc..
Above-mentioned vinyl esters is used when manufacturing polyvinyl ester, such as can be enumerated as：Vinylacetate, vinyl formate
Ester, vinyl laurate, propionate, vinyl butyrate, vinyl pivalate, tertiary ethylene carbonate, stearic acid second
Alkene ester, vinyl benzoate etc..This vinyl acetate can be above-mentioned one or two kinds of or two or more composition therein,
For the present invention, preferred vinylacetate.
In addition, such as it be able to can be enumerated as with the monomer of the vinyl esters combined polymerization：Ethene, propylene, 1- butylene, isobutene
Deng the olefines that carbon number is 2-30；Acrylic acid and its salt, methyl acrylate, ethyl acrylate, n-butyl acrylate, propylene
The acrylic acid such as sour isobutyl ester, tert-butyl acrylate, 2-EHA, lauryl ester, octadecyl ester
Class (such as acrylic acid-C1-18 alkyl esters)；Methacrylic acid and its salt, methyl methacrylate, EMA, methyl
N-propyl, isopropyl methacrylate, n-BMA, Isobutyl methacrylate, methacrylic acid uncle
The methacrylates such as butyl ester, 2-Ethylhexyl Methacrylate, lauryl ester, methacrylic acid octadecane ester
Class (such as methacrylic acid-C1-18 alkyl esters)；Acrylamide, N methacrylamide, N- ethyl acrylamides, N, N- diformazan
Base acrylamide, diacetone acrylamide, acrylamide propane sulfonic and its salt, acrylamide propyl dimethylamine and its salt, N-
The acrylamide derivative such as NMA and its derivative；Methacrylamide, N methacrylamide, N- methyl first
Base acrylamide, N- ethyl methacrylamides, Methacrylamide propane sulfonic acid and its salt, Methacrylamide dimethylamine
Methacrylamide derivatives, N- vinyl formamides, the N- such as amine and its salt, N- methylol methacrylamides and its derivative
The N- vinylamide classes of vinyl acetamide, NVP etc.；Ethylene methacrylic ether, ethyl vinyl ether, n-propyl
It is vinethene, isopropyl-ethylene ether, n-butyl vinyl ether, isobutylvinyl ether, tert-butyl vinyl ether, dodecyl vinyl ether, hard
The ethene ethers such as aliphatic radical vinethene；The nitriles such as acrylonitrile, methacrylonitrile；Chlorinated ethylene, chlorination time vinyl, ethylene fluoride
The ethylene halide base class such as base, fluorination time vinyl；The allyl compounds such as acetic acid pi-allyl, chlorination pi-allyl；Maleic acid, clothing health
The derivative such as the unsaturated carboxylic acids such as acid and its salt or its ester；The vinyl silyl groups compound such as vinyltrimethoxy silane；
Isopropyl acetate；The above-mentioned preferred a- alkene of copolymerization monomer, particularly preferred ethene.
It is above-mentioned to be preferably shorter than 10% with the dosage of the monomer of vinyl esters combined polymerization by mole percent, more preferably
Less than 5%.
The material polyethylene alcohol of the present invention is by through the aqueous of above-mentioned vinyl esters polymerization, alcoholysis, crushing, squeezing or acquisition
Polyvinyl alcohol resin obtains by post processing (further alcoholysis and washing purify) again.
The present invention raw material-plasticizer be usually polyhydroxy-alcohol, can be enumerated as the glycerols such as glycerine, two glycerine, triglycerin,
The alkylidenes such as ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, polyethylene glycol, propane diols, DPG, polypropylene glycol two
Alcohols or polyalkylene glycols, trimethylolpropane etc..These plasticizer, which can be used alone, can also combine two kinds or two kinds
It is used above.To ensure preferably glycerine in the extensibility present invention of film.
Generally, surfactant has adhesion when suppressing film curling to act on, such as the anion surface active that can be used alone
Nonionic surfactant is used alone in agent, also can be combined and uses.
Raw material-surfactant of the present invention can be enumerated as：The sulfuric esters such as the carboxylic acid types such as potassium laurate, octyl salicylate
The sulphonic acids such as type, dodecylbenzenesulfonate, it can also be enumerated as the alkane ether type such as polyethylene glycol oxide oil ether, polyoxyethylene octyl benzene
The polypropylene glycol ether type of alkyl ester type, the polyethylene glycol oxide PPOXs such as the alkylbenzene such as ether ether type, polyoxy Huang ethene laurate etc.,
The alkanolamide type of oleic acid diethyl amide etc., polyoxyalkylene allyl benzene ether type etc..
Raw material-antioxidant of the present invention can be the arbitrary antioxidant such as phenol system antioxidant, BHT,
2,2- di-2-ethylhexylphosphine oxides (4- methyl-6-tert-butylphenols), four [3- (hydroxyphenyl of 3,5- di-t-butyls -4) propionic acid] quaternary amyl alcohol esters, three
(2,4- di-tert-butyl-phenyl) phosphite ester, phosphorous acid three (2,4- di-tert-butyl-phenyl) ester etc., preferably latter two or rear three
The composition of kind.
Embodiment 1
This implementation discloses a kind of preparation method of polyvinyl alcohol polaroid, wherein preparing the film of polyvinyl alcohol polaroid
Stoste is carried out under the protection of nitrogen, is comprised the following steps：
(1) raw material of following mass fraction is prepared：100 parts of polyvinyl alcohol, 10 parts of urea, 12 parts of plasticizer, surface-active
0.08 part of agent, 0.002 part of antioxidant, 0.005 part of iodine, 0.1 part of KI, 0.01 part of boric acid；
(2) polyvinyl alcohol is dissolved in water, polyvinyl alcohol is dissolved the polyvinyl alcohol for completely, being made that concentration is 20% in water
Solution, pH value of solution=6.2；Then add urea to be well mixed, and constant temperature keeps 3h at 50 DEG C；
(3) it is the solution a that concentration is 0.05% by surfactant and the common mixed preparing of antioxidant, then by solution a
Add to be well mixed in plasticizer and form solution b；
(4) KI and iodine are configured to 5g/ml solution c；
(5) compound concentration is 0.5mol/ml boric acid aqueous solution；
(6) solution b, solution c are added in poly-vinyl alcohol solution, is stirred 30min and obtains solution d；
(7) at 60 DEG C, boric acid aqueous solution is added in solution d, is stirred 15 minutes；
(8) liquid material obtained to step (7) uses ultrasonic wave again after being stirred using dasher elder generation machinery
Stirring, the film stoste of polaroid is prepared into after well mixed through filtering；
(9) the film stoste that above-mentioned (8) obtain is extruded into the casting film-forming on roller by die head, then entered through more pair roller barrels
Row is predrying, stretches, dries, is wound into polaroid.
Embodiment 2
This implementation discloses a kind of preparation method of polyvinyl alcohol polaroid, prepares the film stoste of polyvinyl alcohol polaroid
Carry out, comprise the following steps under the protection of nitrogen：
(1) raw material of following mass fraction is prepared：100 parts of polyvinyl alcohol, 0.1 part of urea, 15 parts of plasticizer, surface-active
0.09 part of agent, 0.003 part of antioxidant, 0.008 part of iodine, 0.5 part of KI, 0.05 part of boric acid；
(2) polyvinyl alcohol is dissolved in water, polyvinyl alcohol is dissolved the polyvinyl alcohol for completely, being made that concentration is 30% in water
Solution, pH value of solution=6.0；Then add urea to be well mixed, and constant temperature keeps 1h at 80 DEG C；
(3) it is the solution a that concentration is 0.1% by surfactant and the common mixed preparing of antioxidant, then adds solution a
Enter to be well mixed in plasticizer and form solution b；
(4) KI and iodine are configured to 15g/ml solution c；
(5) compound concentration is 2mol/ml boric acid aqueous solution；
(6) solution b, solution c are added in poly-vinyl alcohol solution, are stirred 30min and obtain solution d；
(7) at 70 DEG C, boric acid aqueous solution is added in solution d, is stirred 20min；
(8) liquid material obtained to step (7) is used again after being stirred using traditional dasher elder generation machinery
Ultrasonic wave stirs, and is prepared into the film stoste of polaroid after well mixed through filtering；
(9) the film stoste that above-mentioned (8) obtain is extruded into the casting film-forming on roller by die head, then entered through more pair roller barrels
Row is predrying, stretches, dries, is wound into polaroid.
Embodiment 3
This implementation discloses a kind of preparation method of polyvinyl alcohol polaroid, prepares the film stoste of polyvinyl alcohol polaroid
Carry out, comprise the following steps under the protection of nitrogen：
(1) raw material of following mass fraction is prepared：100 parts of polyvinyl alcohol, 0.05 part of urea, 24 parts of plasticizer, surface are lived
0.1 part of agent of property, 0.005 part of antioxidant, 0.01 part of iodine, 1.0 parts of KI, 0.1 part of boric acid；
(2) polyvinyl alcohol is dissolved in water, polyvinyl alcohol is dissolved the polyvinyl alcohol for completely, being made that concentration is 30% in water
Solution, pH value of solution=5.5；Then add urea to be well mixed, and constant temperature keeps 16h at 30 DEG C；
(3) it is the solution a that concentration is 0.1% by surfactant and the common mixed preparing of antioxidant, then adds solution a
Enter to be well mixed in plasticizer and form solution b；
(4) KI and iodine are configured to 30g/ml solution c；
(5) compound concentration is 4mol/ml boric acid aqueous solution；
(6) solution b, solution c are added in poly-vinyl alcohol solution, are stirred 30min and obtain solution d；
(7) at 90 DEG C, boric acid aqueous solution is added in solution d, is stirred 30min；
(8) dasher traditional to the liquid material of step (7) acquisition is stirred using ultrasonic wave again after stirring,
The film stoste of polaroid is prepared into after well mixed through filtering；
(9) the film stoste that above-mentioned (8) obtain is extruded into the casting film-forming on roller by die head, then entered through more pair roller barrels
Row is predrying, stretches, dries, is wound into polaroid.
Comparative example 1
This comparative example in place of the difference of embodiment 1 with being：In step (3), by surfactant, antioxidant, plasticizer
It is directly added into the poly-vinyl alcohol solution of step (2).
Found by comparing the polaroid that comparative example 1 is prepared and the polaroid that embodiment 1 is prepared, comparative example 1
The polaroid flaw being prepared is substantially more, and color spot is more, and optical property is poor.Reason is：Surfactant and antioxidant
Amount it is very small, if directly surfactant and antioxidant are put into poly-vinyl alcohol solution, surfactant and antioxygen
Agent is easy to unite, scattered uneven, influences the quality of polaroid subsequently made.
Comparative example 2
This comparative example in place of the difference of embodiment 1 with being：In step (8), the liquid material obtained to step (7) is only adopted
Traditional dasher stirring.
Found by comparing the polaroid that comparative example 2 is prepared and the polaroid that embodiment 1 is prepared, comparative example 2
Color spot caused by the polaroid being prepared is more, optical property is worse.Reason be material only from macroscopically being mixed, thing
That expects is scattered uneven, and the polaroid color spot for causing production to obtain is more, poor optical properties.
Comparative example 3
This comparative example in place of the difference of embodiment 1 with being：In step (8), using only ultrasonic stirrer to step (7)
The liquid material of acquisition is mixed.
Found by comparing the polaroid that comparative example 3 is prepared and the polaroid that embodiment 1 is prepared, comparative example 3
Color spot caused by the polaroid being prepared is more, poor optical properties.Reason is that material mixes without by mixing macroscopically, material
Conjunction is not thorough, and each material dispersion being film-made in stoste is uneven, causes more using the polaroid generation of film stoste production
Color spot, had a strong impact on the optical property of polaroid.
Comparative example 4
Comparative example 4 produces polaroid using the preparation method of routine, i.e., by water, polyvinyl alcohol, plasticizer, surface-active
The auxiliary agents such as agent, antioxidant dissolve by a certain percentage, mix after on roller or steel band curtain coating or coating film forming and through drying and receiving
PVA original films are rolled into, then polaroid is made by washing, swelling, dyeing, stretching, upper and lower overlay film in PVA originals film.
Compare comparative example 4 and embodiment 1 produces obtained polaroid：The polaroid being prepared using the method for embodiment 1,
For from properties of product, the color spot of polaroid is less, and optical property is more preferable；For from cost：Yield rate is higher, material
Loss is smaller, and material loss reduces 10-15%；And from production efficiency for, production efficiency can improve 10-50%.It is former
Because being：Polaroid is produced using conventional method, PVA originals film need to be first prepared and then prepare polaroid again, its long flow path, process are multiple
Miscellaneous, production efficiency declines, and need to be stretched when preparing PVA original films and cutting edge, also need to carry out when preparing polaroid stretching with
Cutting edge, product is easily broken off during succeeding stretch, and material loss is more and influences production efficiency.
Claims (8)
1. a kind of preparation method of polyvinyl alcohol polaroid, it is characterised in that comprise the following steps：
（1）Prepare the raw material of following mass fraction：100 parts of polyvinyl alcohol, urea 0.01-20 parts, plasticizer 5-25 parts, surface are lived
Property agent 0.001-0.1 parts, antioxidant 0.0001-0.01 parts, iodine 0.001-0.01 parts, KI 0.01-1.0 parts, boric acid
0.001-0.1 parts；
（2）Polyvinyl alcohol is dissolved in water, make polyvinyl alcohol dissolved in water completely, be made concentration be 15-30% polyvinyl alcohol it is molten
Liquid, pH value of solution ＜ 7；Then add urea to be well mixed, and constant temperature keeps 0.5-16h at 20-90 DEG C；
（3）Surfactant and antioxidant are configured to the solution a that concentration is 0.01-0.1%, solution a is then added into plasticizer
In be well mixed form solution b；
（4）KI and iodine are configured to 0.01-30g/ml solution c；
（5）Compound concentration is 0.1-4mol/ml boric acid aqueous solution；
（6）Solution b, solution c are added in poly-vinyl alcohol solution, 10-30min is stirred and obtains solution d；
（7）At 55-100 DEG C, boric acid aqueous solution is added in solution d, is stirred 10-30min；
（8）To step（7）The liquid material elder generation machinery of acquisition stir after again using ultrasonic wave stir, be well mixed after by
Filter is prepared into the film stoste of polaroid；
（9）By step（8）The film stoste of acquisition is extruded by die head, the casting film-forming on roller, then is carried out through more pair roller barrels
Predrying, stretching, dry, be wound into polaroid.
A kind of 2. preparation method of polyvinyl alcohol polaroid as claimed in claim 1, it is characterised in that step（1）Middle use
Polyvinyl alcohol by alcoholysis again and wash and be dehydrated acquisition.
3. a kind of preparation method of polyvinyl alcohol polaroid as claimed in claim 2, it is characterised in that the polyvinyl alcohol
Water content is 35-50%.
4. a kind of preparation method of polyvinyl alcohol polaroid as claimed in claim 3, it is characterised in that polyvinyl alcohol used
The degree of polymerization is 1500-3000, and alcoholysis degree is 97-100 mol %.
A kind of 5. preparation method of polyvinyl alcohol polaroid as claimed in claim 1, it is characterised in that plasticizer purity used
≥ 99.5%。
A kind of 6. preparation method of polyvinyl alcohol polaroid as claimed in claim 1, it is characterised in that the step（1）- step
Suddenly（8）It is to be carried out under the protection of inert gas.
7. a kind of preparation method of polyvinyl alcohol polaroid as claimed in claim 6, it is characterised in that the inert gas is
Nitrogen.
A kind of 8. preparation method of polyvinyl alcohol polaroid as claimed in claim 1, it is characterised in that the step（1）In
The number of urea is 0.1-10 parts.
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| 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 |
| CN116100839A (en) * | 2023-03-09 | 2023-05-12 | 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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| CN109438734A (en) * | 2018-10-31 | 2019-03-08 | 中国石油化工股份有限公司 | A kind of good polyvinyl alcohol mesentery of durability and preparation method thereof |
| CN109181185B (en) * | 2018-10-31 | 2021-06-04 | 中国石油化工股份有限公司 | PVA (polyvinyl alcohol) series melt special for optical film and preparation method of film of PVA series melt |
| 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 |
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| CN116100839A (en) * | 2023-03-09 | 2023-05-12 | 合肥德瑞格光电科技有限公司 | Preparation method of light and thin polarizer original sheet |
| 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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