Adhesive agent production method for polaroid

Abstract

The invention provides a method for preparing an adhesive for a polaroid. The method is characterized in that firstly, deionized water at normal temperature is used to wash, soak, re-wash and re-soak polyvinyl alcohol powder for 5 to 6 times for not less than 1 to 3 hours in total so as to reduce the content of alkali composition in the polyvinyl alcohol powder; secondly, the polyvinyl alcohol powder is dissolved according to a certain dissolution curve and is stored at constant temperature; thirdly, before the polyvinyl alcohol adhesive is used, a selected catalyst and a bridging agent are added into the polyvinyl alcohol powder and is stirred simultaneously; and finally, the mixture rolls in a dripping form to be spread between a polarized element polyvinyl alcohol film treated through dyeing and stretching and a TAC film treated through alkalinization, and is adhered, roasted and dried. The preparation method has the advantages of improving the performance of polyvinyl alcohol PVC hydrogel as well as weather resistance of the iodine polaroid.

Description

technical field [0001] The invention relates to an adhesive for polarizers and a formula for polyvinyl alcohol polymer water-soluble glue, in particular to the preparation of a polyvinyl alcohol polymer water-soluble glue with high moisture and heat resistance for polarizers of liquid crystal displays method. Background technique [0002] Polarizers are usually on the polarizing film formed by the adsorption and orientation of iodine or dichroic dyes of dichroic pigments on polyvinyl alcohol-based resins. Compared with dye-based polarizers, iodine-based polarizers have high transmittance and high polarization. Highness and other advantages, but in terms of optical durability is not as good as the dye-based polarizing plate, a number of documents were thickened triacetate cellulose protective film, stretched in acid solution, treated in the adjusted oxidizing solution before stretching, poly Add boric acid and zinc chloride to the vinyl alcohol PVA water glue, add glyoxal, g...

AI Technical Summary

Problems solved by technology

[0002] Polarizers are usually on the polarizing film formed by the adsorption and orientation of iodine or dichroic dyes of dichroic pigments on polyvinyl alcohol-based resins. Compared with dye-based polarizers, iodine-based polarizers have high transmittance and high polarization. Highness and other advantages, but in terms of optical durability is not as good as the dye-based polarizing plate, a number of documents were thickened triacetate cellulose protective film, stretched in acid solution, treated in the adjusted oxidizing solution before stretching, poly Add boric acid and zinc chloride to the vinyl alcohol PVA water glue, add glyoxal, glutaraldehyde, etc. to the polyvinyl alcohol PVA water glue to improve, the anti-humidity and heat resistance effects are not very significant, and 60℃*90% is common *500Hr weather-resistant polarizer shrinks by 100-500nm, which greatly limits the application of polarizers. The traditional production method of polyvinyl alcohol PVA water glue is to directly dissolve polyvinyl alcohol PVA powder in hot water, which will make polyethylene Part of the alkaline substances in the alcohol PVA powder have a bridging effect with the polyvinyl alcohol PVA to increase the initial viscosity of the polyvinyl alcohol PVA aqueous solution. At this time, adding a bridging agent will make the polyvinyl alcohol PVA aqueous solution viscosity too high. The appearance of the product is unfavorable. At the same time, the bridging part of the polyvinyl alcohol PVA and the alkaline substance reduces the effective number of hydroxyl groups, which is not conducive to the firmness of the bonding, thus affecting the weather resistance of the bonding product.