CN104356569B - A kind of polyvinyl alcohol film and preparation method thereof and a kind of polaroid - Google Patents

A kind of polyvinyl alcohol film and preparation method thereof and a kind of polaroid Download PDF

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CN104356569B
CN104356569B CN201410706432.4A CN201410706432A CN104356569B CN 104356569 B CN104356569 B CN 104356569B CN 201410706432 A CN201410706432 A CN 201410706432A CN 104356569 B CN104356569 B CN 104356569B
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polyvinyl alcohol
film
cyclodextrin
surfactant
composite elasticizer
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CN104356569A (en
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丁丽婷
吕新坤
胡明源
江林
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Chongqing spectrum New Material Technology Co.,Ltd.
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Yunnan Yuntianhua Co Ltd
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Abstract

The invention provides a kind of polyvinyl alcohol film, polyvinyl alcohol resin, composite elasticizer and surfactant are prepared from, described composite elasticizer includes many alcohol compounds and cyclodextrin.The present invention is using cyclodextrin and many alcohol compounds as composite elasticizer, wherein, cyclodextrin forms clathration with many alcohol compounds, effectively inhibit the migration in PVA film of the little molecule plasticizer, decrease the loss of plasticizer, further, the interaction of polyvinyl alcohol resin, composite elasticizer and surfactant also add tensile property and the optical property of polyvinyl alcohol film.It addition, in the dyeing course of polyvinyl alcohol film, cyclodextrin and KI3There is Inclusion property, add KI3Stability, improve the Color of PVA film.Result shows, residual volume >=80% of the plasticizer of the polaroid prepared by the present invention, hot strength >=70MPa, light transmission rate >=42.6%, degree of polarization >=99.1%.

Description

A kind of polyvinyl alcohol film and preparation method thereof and a kind of polaroid
Technical field
The invention belongs to technical field of liquid crystal display, be specifically related to a kind of polyvinyl alcohol film and preparation side thereof Method and a kind of polaroid.
Background technology
Polaroid is one of important component part of liquid crystal display, it is common that by polyvinyl alcohol masking stock solution Casting film-forming, simple tension or the stretching of Edge Coloring limit after dyeing, then process with boron compound is fixing, Or process with boron compound is fixing when dyeing stretching, manufacture polarizing film, then paste at this film surface Close three cellulose acetate membrane as protecting film.
In above-mentioned preparation process, for improving the extensibility of polyvinyl alcohol film, preferably in masking stock solution Adding plasticizer, the plasticizer that PVA film is conventional has glycols, many alcohols, amine etc., can individually or mix Close and use, wherein, be most commonly used that glycerol, but, the plasticizer in film in use can move Shifting is oozed out, and causes thin film to soften, tacky, and the PVA film losing plasticizer shrinks, hardening, simultaneously The plasticizer migrated, in follow-up stretching, dyeing course, is dissolved in the tank liquor of aqueous solution, causes PVA Plasticizer loading in film reduces, and causes Film Optics performance, extensibility to decline.
In order to solve the problems referred to above, people have studied different methods.Such as: Publication No. CN1168901A Patent documentation disclose a kind of method reducing the migration of plasticizer, will alkylene oxide and 3-6 hydroxyl many The compound of unit's alcohol additive reaction and PVA mixed incompatible polyvinyl alcohol film of preparing, but used by this invention Oxirane belong to toxic gas, and need to complete in acid condition additive reaction, the raw material of residual Also follow-up masking can be affected.Open a kind of use of knowing clearly of the patent documentation of Publication No. CN101619138A First surface activating agent, second surface activating agent reduce casting surface and plasticising oxidant layer, plasticising oxidant layer with The surface tension of polyvinyl alcohol film, thus the method improving thin film stripping performance, but said method fails Solve migration of plasticizer problem.The patent documentation of Application No. 201010161120.1 proposes a kind of by little molecule The plasticizer compounded by a certain percentage with polymeric plasticizer is to solve asking of polyvinyl alcohol film melt-processed Topic, but fail to improve migration of plasticizer.The patent documentation of Application No. 200910141337.3 discloses one Plant the compositions of polyhydric polyhedral oligomeric silsesquioxane (POSS) and polyvinyl alcohol, this POSS Compound is dissolved in polar solvent, but water insoluble, and industrialized production solvent usage amount is big, cost recovery High.The patent documentation of Application No. 201210439314.2 discloses a kind of polyvinyl alcohol blend, comprises poly- Vinyl alcohol and poly-(methyl) acrylate with hydrophilic alcoholic extract hydroxyl group, the most poly-(methyl) acrylic acid Ester is as plasticizer, but the PVA film tensile property prepared of the method and optical property are poor, uncomfortable In polaroid.
Summary of the invention
In view of this, the technical problem to be solved in the present invention is to provide a kind of polyvinyl alcohol film, this The plasticizer exudation amount of bright provided polyvinyl alcohol film is low, has preferable tensile property, and preparation Polaroid excellent in optical properties.
The invention provides a kind of polyvinyl alcohol film, by polyvinyl alcohol resin, composite elasticizer and surface Activating agent is prepared from, and described composite elasticizer includes many alcohol compounds and cyclodextrin.
Preferably, the mass ratio of described polyvinyl alcohol resin, composite elasticizer and surfactant is 100: (1~30): (0.01~3).
Preferably, the mass ratio of described many alcohol compounds and cyclodextrin is (5~40): 1.
Preferably, described many alcohol compounds are ethylene glycol, glycerol, propylene glycol, diethylene glycol, three sweet One or more in alcohol, tetraethylene glycol (TEG) and trimethylolpropane.
Preferably, described cyclodextrin is alpha-cyclodextrin, beta-schardinger dextrin-or gamma-cyclodextrin.
Preferably, described surfactant is anion surfactant or nonionic surfactant.
Present invention also offers the preparation method of a kind of polyvinyl alcohol film, comprise the following steps:
Polyvinyl alcohol resin, composite elasticizer, surfactant and solvent are mixed, heated and stirred, To polyvinyl alcohol masking stock solution, described polyvinyl alcohol masking stock solution masking is obtained polyvinyl alcohol film.
Preferably, the volatile matter content of described polyvinyl alcohol masking stock solution is 50%~95%.
Preferably, described solvent is dimethyl sulfoxide, dimethylformamide, dimethyl acetylamide, second two One or more in alcohol, propylene glycol, trimethylolpropane, G & W.
Present invention also offers a kind of by polyvinyl alcohol film of the present invention or by provided by the present invention Polaroid prepared by the polyvinyl alcohol film that preparation method prepares.
Compared with prior art, the invention provides a kind of polyvinyl alcohol film, by polyvinyl alcohol resin, Composite elasticizer and surfactant are prepared from, and described composite elasticizer includes many alcohol compounds and ring Dextrin.The present invention is using cyclodextrin and many alcohol compounds as composite elasticizer, and wherein, cyclodextrin is with many Alcohol compound forms clathration, effectively inhibits the migration in PVA film of the little molecule plasticizer, Decrease the loss of plasticizer, and, the phase of polyvinyl alcohol resin, composite elasticizer and surfactant Interaction also add tensile property and the optical property of polyvinyl alcohol film.It addition, at polyvinyl alcohol In the dyeing course of thin film, cyclodextrin and KI3There is Inclusion property, add KI3Stability, improve The Color of PVA film.
Result shows, residual volume >=80% of the plasticizer of the polaroid prepared by the present invention, hot strength >= 70MPa, light transmission rate >=42.6%, degree of polarization >=99.1%.
Detailed description of the invention
The invention provides a kind of polyvinyl alcohol film, by polyvinyl alcohol resin, composite elasticizer and surface Activating agent is prepared from, and described composite elasticizer includes many alcohol compounds and cyclodextrin.
The present invention prepares polyvinyl alcohol with polyvinyl alcohol resin, composite elasticizer and surfactant for raw material Thin film.Wherein, the mass ratio of described polyvinyl alcohol resin, composite elasticizer and surfactant is 100: (1~30): (0.01~3), preferably 100:(10~25): (0.1~1).
The polyvinyl alcohol degree of polymerization preferably 1500~6000 of the present invention, preferably 99 moles % of saponification degree with On, more preferably 99.5 moles more than %.The present invention does not has special limit to the source of described polyvinyl alcohol resin System, the most commercially available.Plasticizer used by the present invention is composite elasticizer, described composite elasticizer bag Including many alcohol compounds and cyclodextrin, wherein, the mass ratio of described many alcohol compounds and cyclodextrin is (5~40): 1, are preferably (10~30): 1.If many alcohol compounds are too small with the ratio of cyclodextrin content, Composite elasticizer reduces with the intermiscibility of PVA, and plasticizing effect weakens, and PVA film hot strength reduces; If many alcohol compounds are excessive with the ratio of cyclodextrin content, then the problem being susceptible to the migration of plasticizer.Institute Stating many alcohol compounds is ethylene glycol, glycerol, propylene glycol, diethylene glycol, 2,2'-ethylenedioxybis(ethanol)., tetraethylene glycol (TEG) and three One or more in hydroxymethyl-propane, preferably diethylene glycol, ethylene glycol or glycerol.Described cyclodextrin is Alpha-cyclodextrin, beta-schardinger dextrin-or gamma-cyclodextrin, preferably gamma-cyclodextrin.
The kind of described surfactant is not particularly limited by the present invention, preferred anionic surfactant Or nonionic surfactant;Described anion surfactant preferred sulfonic acid type anion surfactant, Sulfuric ester salt form surfactant or amido sulfuric acid salt form anion surfactant;More there is choosing, described Sulfonic acid type anion surfactant is dodecylbenzene sodium sulfonate or myristyl sodium sulfonate, described sulphuric acid Ester salt form surfactant is sodium octyl sulfate or sodium lauryl sulphate, described amido sulfuric acid salt form cloudy from Sub-surface activating agent is Palmic acid amide sodium sulfate or stearic ethanolamide sodium sulfate;Described non-from Sub-surface activating agent is polyoxyethylene lauryl ether, polyoxyethylene lauryl base phenyl ether and lauric acid list One or both in glycollic amide.
The thickness of polyvinyl alcohol film provided by the present invention is 40~90 μm, preferably 50~80 μm.
Present invention also offers the preparation method of a kind of polyvinyl alcohol film, comprise the following steps:
Polyvinyl alcohol resin, composite elasticizer, surfactant and solvent are mixed, heated and stirred, To polyvinyl alcohol masking stock solution, described polyvinyl alcohol masking stock solution masking is obtained polyvinyl alcohol film.
First polyvinyl alcohol resin, composite elasticizer, surfactant and solvent are mixed by the present invention, To mixture.
The polyvinyl alcohol degree of polymerization preferably 1500~6000 of the present invention, preferably 99 moles % of saponification degree with On, more preferably 99.5 moles more than %.The present invention does not has special limit to the source of described polyvinyl alcohol resin System, the most commercially available.Plasticizer used by the present invention is composite elasticizer, described composite elasticizer bag Including many alcohol compounds and cyclodextrin, wherein, the mass ratio of described many alcohol compounds and cyclodextrin is (5~40): 1, are preferably (10~30): 1.Described many alcohol compounds be ethylene glycol, glycerol, third One or more in glycol, diethylene glycol, 2,2'-ethylenedioxybis(ethanol)., tetraethylene glycol (TEG) and trimethylolpropane, preferably two Glycol, ethylene glycol or glycerol.Described cyclodextrin is alpha-cyclodextrin, beta-schardinger dextrin-or gamma-cyclodextrin, excellent Elect gamma-cyclodextrin as.
The kind of described surfactant is not particularly limited by the present invention, preferred anionic surfactant Or nonionic surfactant;Described anion surfactant preferred sulfonic acid type anion surfactant, Sulfuric ester salt form surfactant or amido sulfuric acid salt form anion surfactant;More there is choosing, described Sulfonic acid type anion surfactant is dodecylbenzene sodium sulfonate or myristyl sodium sulfonate, described sulphuric acid Ester salt form surfactant is sodium octyl sulfate or sodium lauryl sulphate, described amido sulfuric acid salt form cloudy from Sub-surface activating agent is Palmic acid amide sodium sulfate or stearic ethanolamide sodium sulfate;Described non-from Sub-surface activating agent is polyoxyethylene lauryl ether, polyoxyethylene lauryl base phenyl ether and lauric acid list One or both in glycollic amide.
Described solvent be dimethyl sulfoxide, dimethylformamide, dimethyl acetylamide, ethylene glycol, the third two One or more in alcohol, trimethylolpropane, G & W, preferably water.
After obtaining mixture, by described mixture heated and stirred, obtain polyvinyl alcohol masking stock solution.Described The volatile matter content of polyvinyl alcohol masking stock solution is 50%~95%, preferably 70%~95%.
Described polyvinyl alcohol masking stock solution masking is obtained polyvinyl alcohol film.The present invention is to described masking Method is not particularly limited, it is preferred to use casting film, film by wet, melt extrude or casting film Method prepares polyvinyl alcohol film.The thickness of the polyvinyl alcohol film prepared is 40~90 μm, preferably It is 50~80 μm.
Present invention also offers a kind of polyethylene prepared by above-mentioned polyvinyl alcohol film or said method The polaroid of alcohol film preparation.When being manufactured polaroid by polyvinyl alcohol film provided by the present invention, including PVA film is dyeed, uniaxial extension, fixing process, the step of dried, and regard it and need The most thermally processable, above steps order is not particularly limited by the present invention, for example, it is possible to simultaneously Implement dyeing and uniaxial extension, it is also possible to dyeing, uniaxial tension and fixing process are carried out simultaneously.
Wherein, the dyestuff that described dyeing uses is preferably iodine liquid.The present invention does not has special limit to described extension System, preferably according to mode known in the art, as used wet tensile method or dry stretch process;Described extension Multiplying power preferably more than 4 times, more preferably more than 5 times, further preferred more than 6 times.Described extension Temperature preferably 20~80 DEG C, more preferably 30~70 DEG C, more preferably 40~60 DEG C.Poly-second after extension Enol film thickness is preferably 5~30 μm, preferably 10~25 μm.Described PVA film is fixed Process, the treatment fluid of described treatment fluid preferred boronic acid containing compound.The PVA film of fixing process is done Dry, dried is preferably 40~150 DEG C, more preferably 60~150 DEG C.
Protecting film good to dried polyvinyl alcohol film laminating optical clear and mechanical strength is obtained polarisation Sheet.Wherein, described protecting film can be fitted in the one side of polyethylene film, it is also possible to is fitted in polyethylene Thin film two sides.Described protecting film is three cellulose acetate membrane, polyethylene terephthalate film, poly-methyl Acrylic acid methyl ester. film, polystyrene or polyester mesentery, preferably three cellulose acetate membrane.
The present invention is using cyclodextrin and many alcohol compounds as composite elasticizer, wherein, and cyclodextrin and polyol Compounds forms clathration, effectively inhibits the migration in PVA film of the little molecule plasticizer, subtracts Lack the loss of plasticizer, and, polyvinyl alcohol resin, composite elasticizer and surfactant mutual Effect also add tensile property and the optical property of polyvinyl alcohol film.It addition, it is thin at polyvinyl alcohol In the dyeing course of film, cyclodextrin and KI3There is Inclusion property, add KI3Stability, improve The Color of PVA film.
Result shows, residual volume >=80% of the plasticizer of the polaroid prepared by the present invention, hot strength >= 70MPa, light transmission rate >=42.6%, degree of polarization >=99.1%.
In order to be further appreciated by the present invention, a kind of polyvinyl alcohol present invention provided below in conjunction with embodiment Thin film and preparation method thereof and a kind of polaroid illustrate, and protection scope of the present invention is not by following reality Execute the restriction of example.
Embodiment 1
By the polyvinyl alcohol of 30 parts (degree of polymerization 2600, saponification degree 99.7%), the composite elasticizer of 3 parts, The dodecyl sodium sulfate of 0.1 part is configured to the PVA aqueous solution that volatile matter content is 85 mass %, wherein Composite elasticizer is the mixture of glycerol and cyclodextrin, and described glycerol with the mass ratio of cyclodextrin is 10:1, heated and stirred at 90 DEG C, until being completely dissolved, standing 24h de-bubble, obtaining thickness by the tape casting Degree is the PVA film of 74 μm.
Prepared PVA film is immersed in 30 DEG C of pure water and infiltrate 1min, containing I20.5g/L、KI 20g/L The dye bath of 30 DEG C in contaminate 200s, uniaxial extension is to 5 times of former length simultaneously, at fixing groove (boric acid Potassium 40g/L) and complementary color groove (KI 30g/L) in, continue to extend to 5.5 times of former length, in 80 DEG C be dried 4min, use 5wt% polyvinyl alcohol water solution is as binding agent, in upper three acetic acid of PVA film both sides laminating Cellulose membrane (LOF06306-1556, thick 80 μm), 50 DEG C are dried to obtain polaroid.
Embodiment 2
The compound increasing of 12 parts is added at the polyvinyl alcohol of 100 parts (degree of polymerization 2400, saponification degree 99.5%) Mould agent, the dodecyl sodium sulfate of 0.5 part is configured to the PVA aqueous solution that volatile matter content is 80 mass %, Wherein composite elasticizer is the mixture of glycerol and cyclodextrin, the quality of described glycerol and cyclodextrin it Ratio is 15:1, heated and stirred at 90 DEG C, until being completely dissolved, standing 24h de-bubble, obtaining by the tape casting To the PVA film that thickness is 75 μm.
The method identical according to embodiment 1 prepares polaroid.
Embodiment 3
The compound increasing of 10 parts is added at the polyvinyl alcohol of 100 parts (degree of polymerization 2600, saponification degree 99.7%) Mould agent, the dodecyl sodium sulfate of 3 parts is configured to the PVA aqueous solution that volatile matter content is 70 mass %, Wherein composite elasticizer is the mixture of glycerol and cyclodextrin, the quality of described glycerol and cyclodextrin it Ratio is 40:1, heated and stirred at 90 DEG C, until being completely dissolved, standing 24h de-bubble, obtaining by the tape casting To the PVA film that thickness is 74 μm.
The method identical according to embodiment 1 prepares polaroid.
Embodiment 4
The compound increasing of 20 parts is added at the polyvinyl alcohol of 100 parts (degree of polymerization 3500, saponification degree 99.5%) Mould agent, the dodecyl sodium sulfate of 2 parts is configured to the PVA aqueous solution that volatile matter content is 90 mass %, Wherein composite elasticizer is the mixture of glycerol and cyclodextrin, the quality of described glycerol and cyclodextrin it Ratio is 25:1, heated and stirred at 90 DEG C, until being completely dissolved, standing 24h de-bubble, obtaining by the tape casting To the PVA film that thickness is 75 μm.
The method identical according to embodiment 1 prepares polaroid.
Embodiment 5
The compound increasing of 30 parts is added at the polyvinyl alcohol of 100 parts (degree of polymerization 4500, saponification degree 99.7%) Mould agent, the dodecyl sodium sulfate of 1.5 parts is configured to the PVA aqueous solution that volatile matter content is 95 mass %, Wherein composite elasticizer is the mixture of glycerol and cyclodextrin, the quality of described glycerol and cyclodextrin it Ratio is 5:1, heated and stirred at 90 DEG C, until being completely dissolved, standing 24h de-bubble, obtaining by the tape casting Thickness is the PVA film of 74 μm.
The method identical according to embodiment 1 prepares polaroid.
Embodiment 6
The compound increasing of 15 parts is added at the polyvinyl alcohol of 100 parts (degree of polymerization 1500, saponification degree 99.5%) Mould agent, the dodecyl sodium sulfate of 0.01 part is configured to the PVA aqueous solution that volatile matter content is 50 mass %, Wherein composite elasticizer is the mixture of glycerol and cyclodextrin, the quality of described glycerol and cyclodextrin it Ratio is 30:1, heated and stirred at 90 DEG C, until being completely dissolved, standing 24h de-bubble, obtaining by the tape casting To the PVA film that thickness is 74 μm.
The method identical according to embodiment 1 prepares polaroid.
Comparative example 1
Add the third the three of 12 parts in the polyvinyl alcohol of 100 parts (degree of polymerization 2400, saponification degree 99.5%) Alcohol, the dodecyl sodium sulfate of 0.5 part are configured to the PVA aqueous solution that volatile matter content is 80 mass %, Heated and stirred at 90 DEG C, until being completely dissolved, stands de-bubble, and obtaining thickness by the tape casting is 76 μm PVA film.
The method identical according to embodiment 1 prepares polaroid.
Comparative example 2
In the polyvinyl alcohol of 100 parts (degree of polymerization 3500, saponification degree 99.5%), interpolation 20 parts is compound Plasticizer, the dodecyl sodium sulfate of 2 parts are configured to the PVA aqueous solution that volatile matter content is 90 mass %, Wherein composite elasticizer is the mixture of glycerol and cyclodextrin, the quality of described glycerol and cyclodextrin it Ratio is 3:1, heated and stirred at 90 DEG C, until being completely dissolved, standing de-bubble, obtaining thickness by the tape casting It it is the PVA film of 76 μm.
The method identical according to embodiment 1 prepares polaroid.
Comparative example 3
Add the third the three of 10 parts in the polyvinyl alcohol of 100 parts (degree of polymerization 1700, saponification degree 99.7%) Alcohol, the dodecyl sodium sulfate of 3 parts are configured to the PVA aqueous solution that volatile matter content is 30 mass %, its Middle composite elasticizer is the mixture of glycerol and cyclodextrin, described glycerol and the mass ratio of cyclodextrin For 50:1, heated and stirred at 90 DEG C, until being completely dissolved, standing de-bubble, obtaining thickness by the tape casting It it is the PVA film of 75 μm.
The method identical according to embodiment 1 prepares polaroid.
By embodiment 1~6 and comparative example 1~3 evaluate the residual volume of plasticizer, PVA film as follows Hot strength and the transmitance of polaroid, degree of polarization, result is shown in table 1.
(1) residual volume of plasticizer
Measure the residual volume after stretching, dyeing of the plasticizer in PVA film, after stretching, dyeing The value that plasticizer loading obtains divided by the plasticizer loading in PVA film before stretching, dyeing represents plasticizer Participation ratio, concrete assay method is:
Cut the sample of 1cm*2cm from the central part of PVA film, put into DMSO-d6It is made into 5 matter The solution of amount %, is warmed up to 90 DEG C and extremely dissolves completely, use 500MHz,1H-NMR in pulse daley Time 20s, measures at temperature 30 DEG C, the NMR spectra of gained measure containing of plasticizer in each sample Amount.By the crest of 2 hydrogen partials of glycerol methylene (integrated intensity of crest is Sg) near 3.3ppm, The crest of 2 hydrogen partials of methylene of PVA is (integrated intensity of crest is Sp) inspection near 1.5ppm Measure, utilize its integrated intensity and calculate the content R (quality %) of glycerol in PVA according to Formulas I.
R=(92/94) × (Sg × Sp) × 100 Formulas I
(2) hot strength
Regulation with reference to GB/T12683-2009 is measured.
(3) transmitance
In the middle position of the width of light polarizing film, cut the light polarizing film sample of about 4cm*4cm, with dividing Light photometer (Japan's Shimadzu UV-2200 type, attached integrating sphere), according to JIS Z870 benchmark, carries out C Light source, 2 ° of visuals field visible region visibility correction, by 45 ° of the outrigger shaft direction of relative light polarizing film Transmitance (Y) is obtained with the meansigma methods in-45 ° of directions.
(4) degree of polarization
Use above-mentioned spectrophotometric determination: first measure 2 identical Polarizers with the parallel side of polarizing axis Transmitance during formula overlap, the most parallel transmitance Y, transmitance overlapping in the way of polarizing axis is orthogonal, The most orthogonal transmitance Y, obtain degree of polarization V according to Formula II.
V={ (Y-Y)/(Y+Y) 1/2*100 Formula II
Table 1 test result
As can be seen from Table 1, residual volume >=80% of the plasticizer of the polaroid prepared by the present invention, stretching Intensity >=70MPa, light transmission rate >=42.6%, degree of polarization >=99.1%.Polyethylene provided by the present invention The plasticizer exudation amount of alcohol thin film is low, has preferable tensile property, and the polaroid optical property of preparation Excellent.
The above is only the preferred embodiment of the present invention, it is noted that general for the art For logical technical staff, under the premise without departing from the principles of the invention, it is also possible to make some improvement and profit Decorations, these improvements and modifications also should be regarded as protection scope of the present invention.

Claims (8)

1. a polyvinyl alcohol film, it is characterised in that by polyvinyl alcohol resin, compound plasticising Agent and surfactant are prepared from, and described composite elasticizer includes that many alcohol compounds and ring are stuck with paste Essence;Described many alcohol compounds be ethylene glycol, glycerol, propylene glycol, diethylene glycol, 2,2'-ethylenedioxybis(ethanol)., One or more in tetraethylene glycol (TEG) and trimethylolpropane;Described many alcohol compounds and cyclodextrin Mass ratio be (5~40): 1.
Polyvinyl alcohol film the most according to claim 1, it is characterised in that described poly-second The mass ratio of enol resin, composite elasticizer and surfactant is 100:(1~30): (0.01~3).
Polyvinyl alcohol film the most according to claim 1, it is characterised in that described ring is stuck with paste Essence is alpha-cyclodextrin, beta-schardinger dextrin-or gamma-cyclodextrin.
Polyvinyl alcohol film the most according to claim 1, it is characterised in that described surface Activating agent is anion surfactant or nonionic surfactant.
5. the preparation method of a polyvinyl alcohol film, it is characterised in that comprise the following steps:
Polyvinyl alcohol resin, composite elasticizer, surfactant and solvent being mixed, heating is stirred Mix, obtain polyvinyl alcohol masking stock solution, described polyvinyl alcohol masking stock solution masking is obtained poly-second Enol thin film;
Described composite elasticizer includes many alcohol compounds and cyclodextrin;Described many alcohol compounds For ethylene glycol, glycerol, propylene glycol, diethylene glycol, 2,2'-ethylenedioxybis(ethanol)., tetraethylene glycol (TEG) and trihydroxy methyl third One or more in alkane;The mass ratio of described many alcohol compounds and cyclodextrin is (5~40): 1.
Preparation method the most according to claim 5, it is characterised in that described polyvinyl alcohol The volatile matter content of masking stock solution is 50%~95%.
Preparation method the most according to claim 5, it is characterised in that described solvent is two Methyl sulfoxide, dimethylformamide, dimethyl acetylamide, ethylene glycol, propylene glycol, three hydroxyl first One or more in base propane, G & W.
8. one kind by the polyvinyl alcohol film described in Claims 1 to 4 any one or by right Require polaroid prepared by the polyvinyl alcohol film that 5~7 any one preparation methoies prepare.
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