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Preparation method of thin polyvinyl alcohol polarizing film

A technology of polyvinyl alcohol and polarizing film, applied in the direction of optics, polarizing elements, optical elements, etc., can solve problems such as defects, difficult peeling, curling, etc., achieve uniform strength characteristics, avoid stress unevenness, polarization and light transmittance high effect

Active Publication Date: 2019-06-25
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

[0002] Polarizers with light transmission and shielding properties are the basic components of liquid crystal displays (LCDs), and are widely used in display devices, such as liquid crystal displays and organic light-emitting diodes. In recent years, as liquid crystal displays become thinner, polarizers The sheet is also required to have a thinner thickness, and as a method of manufacturing a thin polarizer, it is more common to stretch a laminated body having a thermoplastic resin substrate and a polyvinyl alcohol (PVA) resin layer, and then perform dyeing treatment. A polarizing film can be formed on a resin substrate; in this method, it is usually necessary to peel off the dyed PVA film from the resin substrate after stretching to form a polarizing film, due to the intermolecular force between the substrate and the PVA film Or the adhesive is attached together, it is not easy to peel off after stretching or curling occurs during the peeling process; at the same time, defects in the PVA layer such as damage to the PVA layer or deformation of the substrate will occur during the peeling process, making the final PVA polarizing film Deterioration of optical properties (such as degree of polarization, etc.)

Method used

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  • Preparation method of thin polyvinyl alcohol polarizing film

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preparation example Construction

[0020] The preparation method of thin polyvinyl alcohol polarizing film of the present invention comprises the following steps:

[0021] a. Preheating the thermoplastic resin substrate;

[0022] b. Form a polyvinyl alcohol layer on a thermoplastic resin substrate and dry it to obtain a laminate; the formation of the laminate can adopt any existing suitable method, such as casting coating, wet film making, melt extrusion, casting film etc., preferably formed by coating a coating liquid containing a PVA-based resin on a thermoplastic substrate; the coating liquid is a solution obtained by dissolving the above-mentioned PVA-based resin in a solvent, and examples of the solvent include dimethyl sulfoxide , dimethylformamide, dimethylacetamide, ethylene glycol, propylene glycol, trimethylolpropane, glycerol, water, etc., preferably water; the polyvinyl alcohol (PVA) resin concentration of the solution is preferably relative to 100 parts by weight of the solution 10-30 parts by wei...

Embodiment 1

[0036] The preparation method of the thin polyvinyl alcohol polarizing film of the present embodiment comprises the following steps:

[0037] a. Preheating the thermoplastic resin substrate, the thermoplastic resin substrate is composed of linear polyphenylene sulfide resin with a crystallinity of 10%, the preheating temperature is 40° C., and the thickness of the thermoplastic substrate is 30 μm;

[0038] b. A polyvinyl alcohol layer is formed by coating on a thermoplastic resin substrate and dried at a temperature of 70°C to obtain a laminate. The surface of the thermoplastic resin substrate used to form the laminate is polished, and the surface roughness is 0.05 μm The coating liquid is water, and the solution concentration is 10 parts of polyvinyl alcohol (PVA) in 100 parts by weight of the solution, and plasticizer ethylene glycol is also added in the solution; the degree of polymerization of polyvinyl alcohol is 1500, and the degree of saponification is 99mol%; The thick...

Embodiment 2

[0042] The preparation method of the thin polyvinyl alcohol polarizing film of the present embodiment comprises the following steps:

[0043] Include the following steps:

[0044] a. Preheating the thermoplastic resin substrate, the thermoplastic resin substrate is composed of linear polyphenylene sulfide resin with a crystallinity of 8%, the preheating temperature is 60° C., and the thickness of the thermoplastic substrate is 150 μm;

[0045] b. A polyvinyl alcohol layer is formed by coating on a thermoplastic resin substrate and dried at a temperature of 90°C to obtain a laminate. The surface of the thermoplastic resin substrate used to form the laminate is polished, and the surface roughness is 0.03 μm The coating solution is water, and the concentration of the solution is 20 parts of polyvinyl alcohol (PVA) in 100 parts by weight of the solution, and plasticizer glycerin is also added in the solution; the degree of polymerization of polyvinyl alcohol is 3800, and the degre...

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Abstract

The invention discloses a preparation method for a thin polyvinyl alcohol (PVA) polarizing film. According to the invention, a thermoplastic resin base material is preheated before a laminate body is formed; a PVA layer is formed on the preheated base material to obtain the laminate body, and the uneven stress of a PVA film can be avoided during a drying process of the laminate body; a formed polarizing film can be easily stripped from the base material, and the crimp caused by the uneven stress cannot happen during a stripping process; an even thin film can be obtained through drying and stretching, intrinsic good characteristics of the polarizing film can be ensured, and the polarizing film has even strength, high degree of polarization and high light transmittance.

Description

technical field [0001] The invention relates to a preparation method of a polyvinyl alcohol film, in particular to a preparation method of a thin polyvinyl alcohol polarizing film. Background technique [0002] Polarizers with light transmission and shielding properties are the basic components of liquid crystal displays (LCDs), and are widely used in display devices, such as liquid crystal displays and organic light-emitting diodes. In recent years, as liquid crystal displays become thinner, polarizers The sheet is also required to have a thinner thickness, and as a method of manufacturing a thin polarizer, it is more common to stretch a laminated body having a thermoplastic resin substrate and a polyvinyl alcohol (PVA) resin layer, and then perform dyeing treatment. A polarizing film can be formed on a resin substrate; in this method, it is usually necessary to peel off the dyed PVA film from the resin substrate after stretching to form a polarizing film, due to the interm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30
CPCG02B5/305
Inventor 丁丽婷吕新坤胡明源
Owner 重庆光谱新材料科技有限公司
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