CN104166172B - Special PVA film of a kind of sandwich construction polaroid and its preparation method and application - Google Patents
Special PVA film of a kind of sandwich construction polaroid and its preparation method and application Download PDFInfo
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- CN104166172B CN104166172B CN201410370734.9A CN201410370734A CN104166172B CN 104166172 B CN104166172 B CN 104166172B CN 201410370734 A CN201410370734 A CN 201410370734A CN 104166172 B CN104166172 B CN 104166172B
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Abstract
The invention belongs to the linear molecule permutation technology field of the special PVA multilayer film of polaroid, disclose special PVA film of a kind of sandwich construction polaroid and its preparation method and application.The special PVA film of this sandwich construction polaroid forms by three layers, and middle layer is the PVA material layer of cross-linking type, and the upper and lower are linear PVA material layer; Upper strata, thickness between middle layer and lower floor are followed successively by 2 ~ 3:4 ~ 6:2 ~ 3; The formula of described linear PVA material layer is weight percentage the PVA1799 of 60 ~ the 80% and plasticiser 3G8 of percentage by weight 20 ~ 40%; The formula of the PVA material layer of described cross-linking type is the crosslinking chemical glutaraldehyde of the PVA2499 of weight ratio number percent 70 ~ 80%, the plasticiser 3G8 of weight ratio number percent 19.5 ~ 28% and weight ratio number percent 0.5 ~ 2%.This film draw ratio is large, and not easily breaks; Molecule is linear and water resistance is better than traditional handicraft.
Description
Technical field
The invention belongs to the linear molecule permutation technology field of the special PVA multilayer film of polaroid, particularly special PVA film of a kind of sandwich construction polaroid and preparation method thereof, and PVA film makes PVA polaroid thus.
Background technology
The imaging of liquid crystal display must rely on polarized light, and all liquid crystal have front and back two panels polarized light piece to be close to liquid-crystalline glasses, the LCD panel of composition about gross thickness 1mm.If lacked any polaroid, LCD panel all can not show image.The basic structure of polaroid comprises: middle PVA (polyvinyl alcohol (PVA)); two-layer TAC (Triafol T); PSA film (pressure sensitive adhesive), Release film (release film) and Protectivefilm (diaphragm).Wherein, what play polarization is PVA layer; but PVA is very easily hydrolyzed; in order to protect the physical characteristics of light polarizing film; therefore having high light transmission rate, water-tolerant at the both sides of PVA each compound one deck has again (TAC) film of certain physical strength to protect, and which forms polaroid raw sheet.
Current polaroid production technology divides with the extension process of PVA film, has dry method and a wet two large class.The dry production technology of polaroid refers to that PVA film is the process carrying out extending under the steam ambient with uniform temperature and damp condition, the object of this process of early application, be the production efficiency that can improve technique, use the larger PVA film of fabric width to carry out producing and being unlikely to through normal off film.But the limitation of this technique is that the homogeneity of PVA film in extension process is restricted, the compound tension force of the former film of therefore formed polaroid, the homogeneity of tone and permanance are not easily stablized, and thus apply less in actual production technique.The wet production technology of polaroid refers to that PVA film is the process of carrying out dyeing, stretching in the liquid of certain proportioning.The early stage limitation of this process is that the stability contorting difficulty that PVA film extends in a liquid is comparatively large, PVA film easily disconnected film when therefore using this processes, and the fabric width of PVA film is restricted.
Summary of the invention
In order to solve the shortcoming and defect part of prior art, primary and foremost purpose of the present invention is to provide a kind of sandwich construction polaroid special PVA film.
Another object of the present invention is to the preparation method that the special PVA film of a kind of above-mentioned sandwich construction polaroid is provided.
Another object of the present invention is to provide the special PVA film of above-mentioned sandwich construction polaroid preparing the application in sandwich construction polaroid.
The object of the invention is achieved through the following technical solutions:
The special PVA film of a kind of sandwich construction polaroid, the special PVA film of this sandwich construction polaroid forms by three layers, and middle layer is the PVA material layer of cross-linking type, and the upper and lower are linear PVA material layer; Upper strata, thickness between middle layer and lower floor are followed successively by 2 ~ 3:4 ~ 6:2 ~ 3; The formula of described linear PVA material layer is weight percentage the PVA1799 of 60 ~ the 80% and plasticiser 3G8 of percentage by weight 20 ~ 40%; The formula of the PVA material layer of described cross-linking type is the crosslinking chemical glutaraldehyde of the PVA2499 of weight ratio number percent 70 ~ 80%, the plasticiser 3G8 of weight ratio number percent 19.5 ~ 28% and weight ratio number percent 0.5 ~ 2%.
The preparation method of the special PVA film of above-mentioned sandwich construction polaroid, according to following operation steps:
(1) PVA1799 is mixed by weight 7:3 with deionized water under normal temperature condition, make PVA1799 water absorption and swelling, mix with plasticiser 3G8 again after swelling 1 ~ 3 hour, add extruder feeding mouth after mixing and carry out casting film-forming, obtain linear PVA material layer; The percentage by weight of PVA1799 and plasticiser 3G8 is respectively 60 ~ 80% and 20 ~ 40%;
(2) crosslinking chemical glutaraldehyde is added in plasticiser 3G8, mix and obtain modification plastifier; PVA2499 is mixed by weight 7:3 with deionized water under normal temperature condition, make PVA2499 water absorption and swelling, mix with modification plastifier again after swelling 1 ~ 3 hour, add extruder feeding mouth after mixing and carry out casting film-forming, obtain the PVA material layer of cross-linking type; The weight ratio number percent of PVA2499, plasticiser 3G8 and crosslinking chemical glutaraldehyde is respectively 70 ~ 80%, 19.5 ~ 28% and 0.5 ~ 2%;
(3) by curtain coating extruder multiple flow passages distribution technique, carry out compound at extruder die head place and become composite membrane; The middle layer of composite membrane is the PVA material layer of cross-linking type, and the upper and lower are linear PVA material layer; The integral thickness of composite membrane is 80 ~ 140 μm;
(4) by being added with in the solution tank of hydrochloric acid after composite membrane being cooled to normal temperature, composite membrane is 2 ~ 3m/min by the speed of solution tank;
(5) again composite membrane is passed through the solution tank that sodium hydroxide solution is housed, acid solution residual in neutralized film, eventually passes the tank that pure water is housed, washes away soda acid;
(6) clean composite membrane is obtained the special PVA film of sandwich construction polaroid after drying.
The glutaraldehyde that composite membrane is made middle layer by hydrochloric acid by step (4) under acid conditions with the small part hydroxyl generation cross-linking reaction in the PVA of middle layer, reach the object improving mechanical property;
The mass percent concentration of step (4) described hydrochloric acid is 0.8 ~ 1.5%; The mass percent concentration 1 ~ 5% of step (5) described sodium hydroxide solution.
The application of the special PVA film of above-mentioned sandwich construction polaroid in preparation PVA polaroid.
Principle of the present invention is:
The special PVA film of sandwich construction polaroid of the present invention is made up of three-decker, and the upper and lower are linear PVA materials, and middle layer is the PVA material of cross-linking type.By the linear PVA material of the upper and lower, make monolithic film membrane have linear feature, by the PVA material of the cross-linking type in middle layer, the mechanics mechanical property of monolithic film membrane is greatly improved.The PVA film of this structure and the characteristic of linear molecule, have again the strong tensile property after being cross-linked.The PVA material of the upper and lower be adopt respectively model be 1799 and 2499 PVA material, add that plasticiser carries out curtain coating film extrusion, middle layer cross-linking type PVA contains plasticiser, micro-crosslinking chemical, can be improved the mechanics mechanical property in middle layer in the following process process after film forming by cross-linking reaction.Trilamellar membrane is combined into composite membrane by the form of curtain coating compound.
The present invention compared with prior art has following advantage and beneficial effect:
(1) sandwich construction polaroid of the present invention special PVA film draw ratio is large, and not easily breaks; (2) molecule linear ratio traditional handicraft of the present invention is better; (3) water resistance of sandwich construction polaroid of the present invention special PVA film is better than traditional.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment 1
(1) 70kg PVA1799 is mixed under normal temperature condition with 30kg deionized water, make PVA1799 water absorption and swelling, mix with 30kg plasticiser 3G8 again after swelling 1 hour, add extruder feeding mouth after mixing and carry out casting film-forming, obtain linear PVA material layer;
(2) 2kg crosslinking chemical glutaraldehyde is added in 28kg plasticiser 3G8, mix and obtain modification plastifier; 70kg PVA2499 is mixed under normal temperature condition with 30kg deionized water, make PVA2499 water absorption and swelling, mix with modification plastifier again after swelling 1 hour, add extruder feeding mouth after mixing and carry out casting film-forming, obtain the PVA material layer of cross-linking type;
(3) by curtain coating extruder multiple flow passages distribution technique, carry out compound at extruder die head place and become composite membrane; The middle layer of composite membrane is the PVA material layer of cross-linking type, and the upper and lower are linear PVA material layer; The integral thickness of composite membrane is 80 ~ 140 μm; Upper strata, thickness between middle layer and lower floor are followed successively by 1:3:1;
(4) be in the solution tank of 0.8% hydrochloric acid by being added with mass percent concentration after composite membrane being cooled to normal temperature, composite membrane is 2m/min by the speed of solution tank;
(5) again composite membrane is passed through the solution tank that mass percent concentration 1% sodium hydroxide solution is housed, acid solution residual in neutralized film, eventually passes the tank that pure water is housed, washes away soda acid;
(6) clean composite membrane is obtained the special PVA film of sandwich construction polaroid after drying.
Embodiment 2
(1) 70kg PVA1799 is mixed under normal temperature condition with 30kg deionized water, make PVA1799 water absorption and swelling, mix with 46.7kg plasticiser 3G8 again after swelling 2 hours, add extruder feeding mouth after mixing and carry out casting film-forming, obtain linear PVA material layer;
(2) 1kg crosslinking chemical glutaraldehyde is added in 25kg plasticiser 3G8, mix and obtain modification plastifier; 75kg PVA2499 is mixed under normal temperature condition with 32kg deionized water, make PVA2499 water absorption and swelling, mix with modification plastifier again after swelling 3 hours, add extruder feeding mouth after mixing and carry out casting film-forming, obtain the PVA material layer of cross-linking type;
(3) by curtain coating extruder multiple flow passages distribution technique, carry out compound at extruder die head place and become composite membrane; The middle layer of composite membrane is the PVA material layer of cross-linking type, and the upper and lower are linear PVA material layer; The integral thickness of composite membrane is 140 μm; Upper strata, thickness between middle layer and lower floor are followed successively by 3:4:3;
(4) be in the solution tank of 1.2% hydrochloric acid by being added with mass percent concentration after composite membrane being cooled to normal temperature, composite membrane is 2.5m/min by the speed of solution tank;
(5) again composite membrane is passed through the solution tank that mass percent concentration 3% sodium hydroxide solution is housed, acid solution residual in neutralized film, eventually passes the tank that pure water is housed, washes away soda acid;
(6) clean composite membrane is obtained the special PVA film of sandwich construction polaroid after drying.
Embodiment 3
(1) 70kg PVA1799 is mixed under normal temperature condition with 30kg deionized water, make PVA1799 water absorption and swelling, mix with 17.5kg plasticiser 3G8 again after swelling 3 hours, add extruder feeding mouth after mixing and carry out casting film-forming, obtain linear PVA material layer;
(2) 0.5kg crosslinking chemical glutaraldehyde is added in 19.5kg plasticiser 3G8, mix and obtain modification plastifier; 80kg PVA2499 is mixed under normal temperature condition with 34.3kg deionized water, make PVA2499 water absorption and swelling, mix with modification plastifier again after swelling 2 hours, add extruder feeding mouth after mixing and carry out casting film-forming, obtain the PVA material layer of cross-linking type;
(3) by curtain coating extruder multiple flow passages distribution technique, carry out compound at extruder die head place and become composite membrane; The middle layer of composite membrane is the PVA material layer of cross-linking type, and the upper and lower are linear PVA material layer; The integral thickness of composite membrane is 120 μm; Upper strata, thickness between middle layer and lower floor are followed successively by 1:2:1;
(4) be in the solution tank of 1.5% hydrochloric acid by being added with mass percent concentration after composite membrane being cooled to normal temperature, composite membrane is 3m/min by the speed of solution tank;
(5) again composite membrane is passed through the solution tank that mass percent concentration 5% sodium hydroxide solution is housed, acid solution residual in neutralized film, eventually passes the tank that pure water is housed, washes away soda acid;
(6) clean composite membrane is obtained the special PVA film of sandwich construction polaroid after drying.
Comparative example
70kgPVA1799 model is mixed with 30kg deionized water, mixes after 1 hour, the PVA particle containing water to be poured in 30kg plastifier 3G8 and fully mix.Mixed PVA potpourri is poured in curtain coating extruder and carries out casting film-forming, thickness is 80 μm.Curtain coating out after film carry out being cooled to normal temperature state, obtain PVA film.
The special PVA film of sandwich construction polaroid that embodiment 1,2 and 3 prepares, with the making of the PVA film manufactured in comparative example for polaroid, last test property indices is as following table 1:
Table 1 PVA polaroid performance detection data
| Breaking elongation/% | Pulling strengrth/MPa | Degree of polarization/% | Transmittance/% | |
| Comparative example | 4.2 | 21 | 98.86 | 41.5 |
| Embodiment 1 | 5.7 | 26 | 99.99 | 43.4 |
| Embodiment 2 | 6.8 | 34 | 99.99 | 44.5 |
| Embodiment 3 | 7.5 | 41 | 99.99 | 46.7 |
Can draw there has been very large lifting through modified PVA composite membrane than unmodified each performance of PVA film by table 1 analysis.
Above-described embodiment is the present invention's preferably embodiment; but embodiments of the present invention are not restricted to the described embodiments; change, the modification done under other any does not deviate from Spirit Essence of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (4)
1. the special PVA film of sandwich construction polaroid, is characterized in that: the special PVA film of this sandwich construction polaroid forms by three layers, and middle layer is the PVA material layer of cross-linking type, and the upper and lower are linear PVA material layer; Upper strata, thickness proportion relation between middle layer and lower floor are followed successively by 2 ~ 3:4 ~ 6:2 ~ 3; The formula of described linear PVA material layer is weight percentage the PVA1799 of 60 ~ the 80% and plasticiser 3G8 of percentage by weight 20 ~ 40%; The formula of the PVA material layer of described cross-linking type is the crosslinking chemical glutaraldehyde of the PVA2499 of weight ratio number percent 70 ~ 80%, the plasticiser 3G8 of weight ratio number percent 19.5 ~ 28% and weight ratio number percent 0.5 ~ 2%.
2. the preparation method of the special PVA film of a kind of sandwich construction polaroid according to claim 1, is characterized in that according to following operation steps:
(1) PVA1799 is mixed by weight 7:3 with deionized water under normal temperature condition, make PVA1799 water absorption and swelling, mix with plasticiser 3G8 again after swelling 1 ~ 3 hour, add extruder feeding mouth after mixing and carry out casting film-forming, obtain linear PVA material layer; The percentage by weight of PVA1799 and plasticiser 3G8 is respectively 60 ~ 80% and 20 ~ 40%;
(2) crosslinking chemical glutaraldehyde is added in plasticiser 3G8, mix and obtain modification plastifier; PVA2499 is mixed by weight 7:3 with deionized water under normal temperature condition, make PVA2499 water absorption and swelling, mix with modification plastifier again after swelling 1 ~ 3 hour, add extruder feeding mouth after mixing and carry out casting film-forming, obtain the PVA material layer of cross-linking type; The weight ratio number percent of PVA2499, plasticiser 3G8 and crosslinking chemical glutaraldehyde is respectively 70 ~ 80%, 19.5 ~ 28% and 0.5 ~ 2%;
(3) by curtain coating extruder multiple flow passages distribution technique, carry out compound at extruder die head place and become composite membrane; The middle layer of composite membrane is the PVA material layer of cross-linking type, and the upper and lower are linear PVA material layer; The integral thickness of composite membrane is 80 ~ 140 μm;
(4) by being added with in the solution tank of hydrochloric acid after composite membrane being cooled to normal temperature, composite membrane is 2 ~ 3m/min by the speed of solution tank;
(5) again composite membrane is passed through the solution tank that sodium hydroxide solution is housed, acid solution residual in neutralized film, eventually passes the tank that pure water is housed, washes away soda acid;
(6) clean composite membrane is obtained the special PVA film of sandwich construction polaroid after drying.
3. preparation method according to claim 2, is characterized in that: the mass percent concentration of step (4) described hydrochloric acid is 0.8 ~ 1.5%; The mass percent concentration 1 ~ 5% of step (5) described sodium hydroxide solution.
4. the application of the special PVA film of sandwich construction polaroid according to claim 1 in preparation PVA polaroid.
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| CN104656178B (en) * | 2015-01-15 | 2017-02-01 | 张宝庆 | Imaging polaroid for LCD imaging, and dyeing manufacturing method thereof |
| CN106519270B (en) * | 2016-10-27 | 2019-10-18 | 重庆云天化瀚恩新材料开发有限公司 | A kind of preparation method of polyvinyl alcohol film |
| CN107471694A (en) * | 2017-09-13 | 2017-12-15 | 安徽鼎正包装材料有限公司 | A kind of film forming preparation technology of PVA film |
| CN110539464B (en) * | 2019-09-16 | 2021-11-23 | 安徽皖维高新材料股份有限公司 | Method for improving tensile property of polyvinyl alcohol optical film |
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| TWI309200B (en) * | 2005-12-02 | 2009-05-01 | Daxon Technology Inc | Method for fabricating a polarization film |
| CN101089661A (en) * | 2006-06-16 | 2007-12-19 | 达信科技股份有限公司 | Polarization plate and manufacturing method thereof |
| JP5124704B1 (en) * | 2012-01-30 | 2013-01-23 | 住友化学株式会社 | Manufacturing method of polarizing plate |
| JP5362059B2 (en) * | 2012-03-09 | 2013-12-11 | 住友化学株式会社 | Method for producing polarizing laminated film |
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