Polyvinyl alcohol film preparation method

A polyvinyl alcohol-based and polyvinyl alcohol technology, which is applied in the field of preparation of polyvinyl alcohol-based films

Active Publication Date: 2017-03-22
重庆光谱新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the above method is used to manufacture PVA polarizing film, it will inevitably require large-scale transformation of downstream production lines, which is usually not what polarizer manufacturers want to see

Method used

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preparation example Construction

[0024] The invention provides a method for preparing a polyvinyl alcohol-based film, comprising: providing a composite film; the composite film includes a first polyvinyl alcohol-based film layer and a second polyvinyl alcohol-based film layer arranged on the first polyvinyl alcohol-based film layer Polyvinyl alcohol-based film layer; the first polyvinyl alcohol-based film layer is a polarizer manufacturing layer; the second polyvinyl alcohol-based film layer is a water-soluble polyvinyl alcohol-based film; the composite film is swollen and dyed , After stretching and fixing, the water-soluble polyvinyl alcohol-based film is removed to obtain a polyvinyl alcohol-based film.

[0025] The present invention has no special limitation on the sources of all raw materials, which can be commercially available.

[0026] According to the present invention, the composite film includes a first polyvinyl alcohol-based film layer and a second polyvinyl alcohol-based film layer arranged on t...

Embodiment 1

[0058] The film coating solution for the second polyvinyl alcohol film layer is configured according to the mass ratio, polyvinyl alcohol: glycerol: sodium lauryl sulfate: water = 8: 0.64: ​​0.08: 92. The degree of polymerization of polyvinyl alcohol is 2800, and the degree of saponification is 89%.

[0059] The film coating solution for the first polyvinyl alcohol film layer is configured according to the mass ratio, polyvinyl alcohol: glycerol: sodium lauryl sulfate: water = 8: 0.64: ​​0.08: 92. Wherein the degree of polymerization of polyvinyl alcohol is 9000, and the degree of saponification is 99.99%.

[0060] Through double-layer co-extrusion, it is coated on a drum or a steel belt, and dried and formed on its surface. Usually, the drying temperature is preferably 70°C; the moisture content is controlled to 17%, and a preformed film is obtained. The pre-formed film can be dried by multi-roller and oven to further control the film to 3.5%. After drying, the manufacture ...

Embodiment 2

[0063] The film coating solution for the second polyvinyl alcohol film layer is configured according to the mass ratio, polyvinyl alcohol: glycerol: sodium lauryl sulfate: water = 40: 12: 0.4: 48. Wherein the degree of polymerization of polyvinyl alcohol is 1000, and the degree of saponification is 87%.

[0064] The film coating solution of the first polyvinyl alcohol film layer is configured according to mass ratio, polyvinyl alcohol: glycerol: sodium lauryl sulfate: water = 40: 12: 0.4: 48. Wherein the degree of polymerization of polyvinyl alcohol is 1000, and the degree of saponification is 99.99%.

[0065]Through double-layer co-extrusion, it is coated on a drum or a steel belt, and dried and formed on its surface. Usually, the drying temperature is preferably 99°C; the moisture content is controlled to 25%, and a preformed film is obtained. The pre-formed film can be dried by multi-roller and oven to further control the film to 3.5%. After drying, the manufacture of the...

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Abstract

The invention provides a polyvinyl alcohol film preparation method. The method includes: providing a composite film, wherein the composite film comprises a first polyvinyl alcohol film layer and a second polyvinyl alcohol film layer on the first polyvinyl alcohol film layer, the first polyvinyl alcohol film layer is a polaroid manufacturing layer, and the second polyvinyl alcohol film layer is a water-soluble polyvinyl alcohol film; subjecting the composite film to swelling, dyeing, stretching and fixing, and removing the water-soluble polyvinyl alcohol film to obtain a water-soluble polyvinyl alcohol film. Compared with the prior art, the polyvinyl alcohol film preparation method has advantages that by swelling, dyeing, stretching and fixing of the double-layer composite film, a double-layer substrate structure is capable of providing more stable extending power for film extension as compared with single-layer films, so that high-magnification stretching can be realized; in addition, the two film layers are both polyvinyl alcohol films structurally and basically uniform in stretching stress, stretching separation and nonuniformity in stretching can be avoided, and accordingly extension fracture caused by excessive thinness of the film is avoided.

Description

technical field [0001] The invention belongs to the technical field of polymer films, in particular to a preparation method of a polyvinyl alcohol film. Background technique [0002] Polarizer is an important part of liquid crystal display (LCD), mainly used to control the optical activity of the light passing through the liquid crystal, usually formed by directional adsorption of iodine or dichroic dye of dichroic pigment on polyvinyl alcohol resin film made of polarizing film. With the thinner and lighter LCD products, polarizers are also developing in the direction of thinner thickness and larger size. Thinning of polyvinyl alcohol (PVA) films for polarizers is the primary problem to be solved. However, many production problems will occur after the PVA film is thinned. For example, after the thickness of the PVA film is reduced, it is difficult to achieve high-magnification stretching in the back-stage dyeing and stretching process, and the phenomenon of broken bands is...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L29/04D06P3/58B29C69/00B29L7/00B29L9/00
Inventor 李承龙吕新坤谢凯玲谭海军古文正丁丽婷
Owner 重庆光谱新材料科技有限公司
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