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Polyvinyl alcohol (PVA) film and preparation method, polarizing film and polarizing filter thereof

A polyvinyl alcohol film, polyvinyl alcohol technology, applied in optics, polarizing elements, optical elements, etc., can solve the problems of reducing the utilization rate of swelling liquid and dyeing liquid, and increasing processing costs.

Active Publication Date: 2016-03-30
重庆光谱新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] For example, the Chinese patent whose publication number is CN103724642A discloses a process of making film by rollers and wet stretching. This process ensures the performance of large-sized PVA films in the process of film making by controlling the transverse thickness of the film. The prepared PVA film has no concave-convex streaks, but after the PVA film is swelled and dyed, a large number of small molecular substances are precipitated, which greatly reduces the usage rate of swelling solution and dyeing solution, and increases the processing cost

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  • Polyvinyl alcohol (PVA) film and preparation method, polarizing film and polarizing filter thereof

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preparation example Construction

[0036] The present invention also provides a kind of preparation method of polyvinyl alcohol film, comprises the following steps:

[0037] A) mixing polyvinyl alcohol, a plasticizer, a surfactant and a solvent to obtain a mixed solution;

[0038] The mass ratio of the polyvinyl alcohol, plasticizer and surfactant is (5-65): (0.1-12): (0.01-2);

[0039] The molecular weight distribution of the polyvinyl alcohol is 1.5~3.0;

[0040] B) forming a film from the mixed solution in step A) to obtain a polyvinyl alcohol film.

[0041] In the present invention, the polyvinyl alcohol is preferably washed first, and the small molecular substances are eluted in advance to further reduce the amount of dissolution. The specific washing steps are: soak the polyvinyl alcohol in water to obtain pretreated polyvinyl alcohol, and the soaked The temperature is preferably 0 to 80°C, more preferably 10 to 70°C, and most preferably 20 to 60°C. The present invention has no special limitation on th...

Embodiment 1

[0073] Use vinyl acetate as a monomer, methanol as a solvent, and azobisisobutyronitrile as an initiator to complete the synthesis of polyvinyl acetate. After removing residual impurities by washing with methanol, the alcohol of vinyl acetate is completed in sodium hydroxide solution. solution, and the polyvinyl alcohol with a degree of polymerization of 9000, a molecular weight distribution of 3.0 and a degree of saponification of 99.7% was prepared.

[0074] Soak and mix polyvinyl alcohol with a sufficient amount of water, wash at 40° C. for 16 hours, and filter to obtain polyvinyl alcohol. According to the mass ratio, polyvinyl alcohol: glycerol: sodium lauryl sulfate: water = 8: 0.4: 0.08: 92 After preparing the solution, heat and dissolve at 95 ° C, and remove the bubbles of the solution by standing still.

[0075] The polyvinyl alcohol mixed solution is cast onto the surface of the steel strip through the die to form an initial embryonic film. The temperature of the embr...

Embodiment 2

[0080] Use vinyl acetate as a monomer, methanol as a solvent, and azobisisobutyronitrile as an initiator to complete the synthesis of polyvinyl acetate. After removing residual impurities by washing with methanol, the alcohol of vinyl acetate is completed in sodium hydroxide solution. solution, and the polyvinyl alcohol with a degree of polymerization of 9000, a molecular weight distribution of 1.5 and a degree of saponification of 99.7% was prepared.

[0081] According to the mass ratio, polyvinyl alcohol: glycerol: sodium lauryl sulfate: water = 8: 0.4: 0.08: 92. Prepare the solution according to the ratio, heat and dissolve at 95°C, and remove the bubbles of the solution by standing still to obtain a polyvinyl alcohol mixed solution.

[0082] The polyvinyl alcohol mixed solution is cast onto the surface of the steel strip through the die to form an initial embryonic film. The temperature of the embryonic film is controlled at 70°C and the temperature of the steel strip is 6...

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Abstract

The invention provides a polyvinyl alcohol (PVA) film. The PVA film is prepared by the following raw materials of polyvinyl alcohol, a plasticizer and a surface active agent according to the mass ratio of (5-65):(0.1-12):(0.01-2); the molecular weight distribution of PVA is 1.5-3.0. The PVA film has the advantages that after repeated studying and finding, the molecular weight distribution of PVA polymer resin in the PVA film has a significant function on the property of the prepared film; by controlling the molecular weight distribution of the PVA polymer resin within the range of 1.5-3.0, after the PVA film is swelled and dyed, the separating of low-molecule matters is greatly reduced, the original complete structure is maintained, and the breaking is avoided in the subsequent drawing process. The invention also provides a preparation method, a polarizing film and a polarizing filter of the PVA film.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a polyvinyl alcohol film, a preparation method thereof, a polarizing film and a polarizing plate. Background technique [0002] Polarizer is an important part of liquid crystal display (LCD), mainly used to control the optical rotation of light passing through liquid crystal. Usually, it is made of a polarizing film formed by directionally adsorbing iodine of a dichroic pigment or a dichroic dye on a polyvinyl alcohol (PVA) resin film. [0003] According to the stretching process of polyvinyl alcohol film, the preparation method of polarizing film can be divided into two categories: wet stretching process and dry stretching process. Dry stretching process means that under certain temperature and humidity conditions, In the environment of inert gas, the polyvinyl alcohol film is stretched to a certain ratio, and then dyeing, color fixing, compounding, drying...

Claims

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Application Information

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IPC IPC(8): C08L29/04C08K5/053C08K5/41C08J5/18C08J7/00G02B5/30
CPCC08J5/18C08J7/08C08J2329/04C08K5/053C08K5/41C08L2203/16G02B5/305C08L29/04
Inventor 李承龙吕新坤胡明源谭海军谢凯玲古文正丁丽婷
Owner 重庆光谱新材料科技有限公司
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