Modified polyvinylalcohol (PVA) base film, preparation method thereof and polarizer

Abstract

The invention provides a modified polyvinylalcohol (PVA) base film, a preparation method thereof and a polarizer prepared by the modified PVA base film. The preparation method of the modified PVA base film comprises the following steps of: (1) adopting fluorosilane to carry out surface grafting modification on nano silicon dioxide so as to obtain modified nano silicon dioxide powder; (2) adding the modified nano silicon dioxide powder obtained in the step (1) into polyvinyl alcohol polymer aqueous solution so as to prepare polyvinyl alcohol polymer composite solution; and (3) casting the polyvinyl alcohol polymer composite solution prepared by the step (2) on the surface of a cast substrate so as to obtain the modified PVA base film. In the invention, nano silicone dioxide is modified by utilizing low-surface-energy fluorosilane, and further the PVA base film is modified in a crosslinking manner, so that the humidity-heat resistance and the stability of the PVA base film are improved and the mechanical performance and the stain resistance of the PVA base film are improved.

Description

technical field [0001] The invention relates to a polyvinyl alcohol base film, in particular to a modified polyvinyl alcohol base film, a preparation method thereof and a polarizer made from the modified polyvinyl alcohol base film. Background technique [0002] Polarizer is one of the indispensable and important parts of LCD display. Its function is to convert natural light into polarized light, and cooperate with the twisting of liquid crystal molecules to achieve the purpose of controlling the passage of light and the presentation of color signals. At present, most of the polarizers commonly used in LCDs are made of highly oriented polymers such as polyvinyl alcohol (PVA) base films, dyed with various dichroic dyes, and at a certain humidity After stretching at temperature and temperature, another layer of triacetate cellulose (TAC) film with high light transmittance, good water resistance and certain mechanical strength is compounded on both sides of the polyvinyl alcoho...

AI Technical Summary

Problems solved by technology

For example, Chinese Patent Publication No. 1979231A and No. 101281267A both use dibasic carboxylic acid and boric acid to cross-link the PVA base film, but boric acid increases the toughness of the PVA base film and limits the strength of the PVA base film during the extension process. Extension ratio

It was also silicon dioxide (SiO 2 ) is sprayed on the PVA base film with vacuum coating method and ion spraying method to improve the heat and humidity resistance characteristics of the PVA base film, but the cost of this silicon dioxide coating method is relatively high, and it will also cause silicon dioxide and PVA base film The problem of poor compatibility

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