Double-coating cellulose triacetate film

Abstract

The invention belongs to the technical field of cellulose triacetate films, and particularly relates to a double-coating cellulose triacetate film. The invention discloses the double-coating cellulosetriacetate film which sequentially comprises a cellulose triacetate film, a cellulose acetate butyrate layer and a cellulose acetate butyrate grafting layer from bottom to top, wherein the celluloseacetate butyrate layer comprises the following components in parts by mass: 5-10 parts of cellulose acetate butyrate; 84 to 90 parts of a first solvent; 0.7 to 1.5 parts of a plasticizer; the cellulose acetate butyrate grafting layer comprises the following components: 5-20 parts of olefin resin; 60 to 80 parts of a second solvent; and 0.1 to 2 parts of a catalyst.

Description

technical field [0001] The invention belongs to the technical field of cellulose triacetate films, in particular to a double-coated cellulose triacetate film. Background technique [0002] Cellulose triacetate film (TAC) is widely used in the support body and protective film of polarizer due to its excellent optical and physical properties. With the development of film materials, polarizers are widely used in various thermosetting resin glasses, so that ordinary resin glasses have the function of polarizing. This technical field requires polarizers and resins to have good adhesion, that is, cellulose triacetate Ester film has good adhesion to resin. The main component of cellulose triacetate film is cellulose triacetate, which is obtained by the esterification reaction of acetic anhydride and hydroxyl groups on cellulose. Cellulose triacetate contains a large amount of ester groups and a very small amount of hydroxyl groups , when the prepared polarizer is bonded to other ...

AI Technical Summary

Problems solved by technology

The main component of cellulose triacetate film is cellulose triacetate, which is obtained by the esterification reaction of acetic anhydride and hydroxyl groups on cellulose. Cellulose triacetate contains a large amount of ester groups and a very small amount of hydroxyl groups , when the prepared polarizer is bonded to other materials, it often appears that the bond is not strong or even impossible to bond

With the development of the glasses industry, the product produced by this patent can no longer meet the current market demand, and there are certain defects in this product: the product curls, and there is a certain shrinkage, which affects the flatness of the polarizer; the CN101186716A patent product has curling and shrinkage defects. The reason is: the coating uses a strong polar solvent as the main solvent. When they dissolve CAB as a coating solution and coat the surface of the TAC film, due to the strong polarity of the solvent, the base film TAC is quickly dissolved, and the TAC is made in the drying process. Serious curling and shrinkage occur in the base film, and it is not easy to change the drying process and conditions; in addition, there is a situation of weak bonding after the product is bonded to the resin; the main reasons for the weak bonding defect of the CN101186716A patent product are: 1. The CAB resin used in this patent has not been optimized. From the perspective of the CAB resin model, the CAB resin with low butyryl content has a relatively high hardness. When the coating is bonded to a thermosetting resin, it is impossible to achieve adhesion due to the difficulty of bending due to the high hardness. Second, the coating CAB is bonded to the resin CR-39, and the bonding mechanism is the physical bonding between the hydroxyl group on the surface of the CAB resin coating and the CR-39 lens

[0004] In patents JP2002062423A and JP2009544499A, after coating the surface of the polarizing film with a urethane-based adhesive and drying it, and pasting a polycarbonate sheet, the bonding between the polarizer and the thermosetting resin is realized. The layer belongs to the amide substance, and the bonding between the substance and polycarbonate is still a physical bond, and the bonding fastness still has certain deficiencies.

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