Polarizer preparation method

Abstract

The invention provides a polarizer preparation method, which comprises: drying a dyed, stretched and cleaned PVA film at a drying temperature of 40-95 DEG C under a drying environment humidity of 50-100% RH to make the moisture content of the obtained plain film be 2-5 wt%; and forming a protective layer on the surface of the film to obtain the polarizer. By means of the technical scheme, on the premise that an existing polaroid manufacturing process is not changed basically, the drying conditions of the dyed, stretched and cleaned PVA film are optimized, the surface compatibility of the plainfilm is improved, the occurrence rate of cracking point defects and the like is effectively reduced, and therefore the product quality is improved.

Description

technical field [0001] The invention belongs to the technical field of polarizer preparation, and in particular relates to a method for preparing a polarizer. Background technique [0002] With the "ubiquitous" display technology, as a necessary part of the display - polarizer (ie, polarizer) is also increasingly used in the field. But what follows is that the performance requirements of polarizers are becoming more and more stringent in order to adapt to the widely varying use environments. [0003] Polarizers are usually obtained by uniaxially stretching films after dyeing polyvinyl alcohol-based films and dichroic materials (such as iodine, special dyes, etc.). Because it is made by stretching, the polarizer is easy to shrink and deform in harsh environments such as heat and humidity (such as ambient temperature higher than 60°C, humidity environment close to condensation, etc.), which in turn makes its optical properties (such as polarization) Decrease in degree, etc.)...

AI Technical Summary

Problems solved by technology

However, water-based adhesives sometimes peel off at the bonding interface under humidified conditions

In view of the above problems, the prior art has proposed adhesives for polarizers containing acetoacetyl group-containing polyvinyl alcohol-based resins and cross-linking agents. Although this method introduces hydrophobic groups, it can effectively improve the performance of PVA water-based adhesives in high-humidity environments. However, it also introduces the problem of incompatibility of the bonding interface. There is no obvious improvement in solving the crack point problem, which is manifested as bright spots and bright lines randomly distributed, and even peeling at the bonding interface. , will seriously affect the display effect

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