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UV curing adhesive for polarizing plate, and preparation method and application thereof

A technology for polarizing plates and adhesives, applied in adhesives, non-macromolecular organic compound adhesives, optics, etc., can solve problems such as the curing state of adhesives that are easily damaged by moisture, the deterioration of polarization efficiency of polarizing plates, and light leakage of polarizing plates. , to improve durability, increase electron cloud density, and prevent cracks

Active Publication Date: 2020-12-04
JIANGSU TETRA NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Existing cationic curing adhesives have high adhesion and heat resistance to various films, but dark polymerization (delayed curing) occurs, so when the cured product of the adhesive is stored in the form of a coil, it is prone to curling deformation The problem
In addition, after curing, the adhesive is vulnerable to moisture damage and may cause changes in the curing state, so in order to ensure uniformity and reliability of curing, it is necessary to strictly control the environmental humidity and the moisture content of the polyvinyl alcohol (PVA) film content, increasing the difficulty of industrial operation
In addition, when existing adhesives are exposed to hot and humid conditions for a long time, polarizers using free radical curing adhesives suffer from deterioration in polarization efficiency and are prone to light leakage at the cut-off of polarizers dyed with iodine or dyes
In addition, the polarizing plate may cause serious light leakage under conditions worse than heat and humidity (such as soaking in warm water at 60°C)

Method used

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  • UV curing adhesive for polarizing plate, and preparation method and application thereof
  • UV curing adhesive for polarizing plate, and preparation method and application thereof
  • UV curing adhesive for polarizing plate, and preparation method and application thereof

Examples

Experimental program
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Embodiment

[0034] According to the parts by weight of Table 1, bifunctional alicyclic epoxy compounds, polyglycidyl ethers of aromatic compounds, bifunctional (meth)acrylic compounds, vinyl ether compounds, carboxylic acid compounds containing unsaturated double bonds, Cationic photoinitiators and free radical initiators are routinely mixed to prepare UV-curable adhesives for polarizers. Wherein, in embodiment 5, the vinyl ether compound is 4-hydroxybutyl vinyl ether; in embodiment 6, the carboxylic acid compound containing unsaturated double bonds is fumaric acid; in embodiment 10, will contain The carboxylic acid compound with saturated double bond is replaced with polycaprolactone trihydric alcohol, a conventional adhesion promoter; the rest of the raw materials are as above A to G.

Embodiment 8

[0052] The peeling force of embodiment 8 reaches 5.6N / cm (PET film), 5.3N / cm (TAC film), 5.5N / cm (COP film); the white edge after the existing commercially available adhesive polarizing plate is very little after heat and humidity resistance, 0.1 mm, but the peel force is low and selective, 3.1N / cm (PET film), 3.3N / cm (TAC film), 1.9N / cm (COP film).

[0053] Table 2 embodiment, comparative example test result

[0054]

[0055] The UV curing adhesive for polarizing plates designed in the present invention utilizes the characteristics of delayed curing technology, interpenetrating network technology (IPN) and free radical-cationic UV curing advantages, and on this basis creatively adds vinyl ether compounds and The carboxylic acid compound with unsaturated double bonds, while ensuring the higher bonding performance of the cured adhesive, significantly improves the curing speed, heat and humidity resistance and bonding strength of the adhesive; the UV curable adhesive of the e...

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Abstract

The invention discloses a UV curing adhesive for a polarizing plate, and a preparation method and application thereof. The UV curing adhesive for the polarizing plate is obtained by mixing an epoxy compound, a (meth)acrylate compound, a vinyl ether compound, a carboxylic acid compound containing unsaturated double bonds, a cationic photoinitiator and a free radical photoinitiator. The UV curing adhesive can prevent degradation of adhesiveness of the radical curable adhesive composition by maintaining a hydrogen bond between a polyvinyl alcohol (PVA) film and a hydroxyl group of the radical curable adhesive composition, thereby improving moisture resistance of the adhesive.

Description

technical field [0001] The invention relates to a UV curing adhesive, in particular to a UV curing adhesive for polarizing plates. Background technique [0002] Current polarizers have a laminated structure in which one or more optical films are adhered with an adhesive to one or two polarizers formed of a polyvinyl alcohol (PVA)-based resin, usually dyed with a dichroic dye or iodine. On the surface. In the related art, optical films based on triacetyl cellulose (TAC) films, polyethylene terephthalate (PET) films, cycloolefin polymer (COP) films, and acrylic films are mainly used as polarizing plates. [0003] Existing cationic curing adhesives have high adhesion and heat resistance to various films, but dark polymerization (delayed curing) occurs, so when the cured product of the adhesive is stored in the form of a coil, it is prone to curling deformation The problem. In addition, after curing, the adhesive is vulnerable to moisture damage and may cause changes in the c...

Claims

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Application Information

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IPC IPC(8): C09J4/02C09J4/06G02B5/30
CPCC09J4/00C09J4/06G02B5/305
Inventor 孟允韩建伟
Owner JIANGSU TETRA NEW MATERIAL TECH
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