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UV curing packaging adhesive for liquid crystal display

A liquid crystal display and adhesive technology, applied in adhesives, adhesive types, polyurea/polyurethane adhesives, etc., can solve unreacted groups' aging resistance, unfavorable anti-yellowing performance, and UV curing adhesive performance can not be fully satisfied , The problem of less charged ions in the adhesive, etc., to achieve the effect of excellent solvent resistance, low curing shrinkage rate, and fast curing speed

Inactive Publication Date: 2010-06-09
BEIJING HYSTIC NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the most widely used epoxy acrylate system in the packaging of the electronic industry is its main characteristics: low cost, good reliability, fast photocuring reaction rate, high hardness and tensile strength after curing, and good solvent resistance; Disadvantages Yes: The cured adhesive layer is highly brittle, and the polymerization reaction is "frozen" by the rigid cross-linked network structure at a low conversion rate, and the remaining unreacted groups are not good for aging resistance, anti-yellowing and other properties
[0006] 3. Any external current-carrying substances during the use of the LCD will affect its normal operation, and the content of charged ions in the adhesive must be controlled to a minimum;
[0008] The performance of existing UV curing adhesives cannot fully meet the above requirements

Method used

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  • UV curing packaging adhesive for liquid crystal display

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Under normal temperature and pressure, according to the content of each component specified in the following Table 1, the prepolymer is selected from polyurethane acrylate, and the reactive diluent monomer is selected from a mixture of ethyl acrylate and ethoxylated bisphenol A diacrylate. The initiator is selected from 1-hydroxy-cyclohexyl phenyl ketone, and the auxiliary agent is selected from gamma-aminopropyl triethoxysilane. Add the above materials into the reaction vessel, and disperse evenly with a planetary mixer at a temperature of 20-40°C. The UV curing light source can be a 1000W medium pressure mercury lamp with a light intensity of 80mW / cm 2 , the effective optical radiation center wavelength is 365nm. Dispensing glue at the position where the liquid crystal display is dispensing, at 200mj / cm 2 Solidify under the accumulated energy, cool for 5 minutes, conduct high temperature and high humidity 85℃×85%RH×1500h, high and low temperature impact -40~80℃×1500...

Embodiment 2

[0029] Repeat the method of Example 1 according to the content of each component specified in the following table 1, the prepolymer is selected from polyurethane acrylate and epoxy acrylate, and the reactive diluent monomer is selected from hydroxyethyl methacrylate and ethoxylated bisphenol A diacrylate mixture, the photoinitiator is a mixture of 1-hydroxy-cyclohexyl phenyl ketone and benzoin dimethyl ether, and the auxiliary agent is γ-[(2,3)-glycidyloxy]propyltrimethoxysilane . The preparation and test environment are the same as those in Example 1, and the test results are listed in Table 1.

Embodiment 3

[0031] Repeat the method of Example 1 according to the content specified in the following table 1, the prepolymer is selected from urethane acrylate, epoxy acrylate and polyester acrylate to mix, the reactive diluent monomer is selected from hydroxyethyl methacrylate, and the photoinitiator is selected from 2,4,6-trimethylbenzoyl-diphenylphosphine oxide and 2-hydroxy-2-dimethyl-1-propanone are mixed, and the auxiliary agent is γ-(methacryloyloxy)propyl trimethoxy silane and γ-mercaptopropyltrimethoxysilane mixed. The preparation and test environment are the same as those in Example 1, and the test results are listed in Table 1.

[0032] The examples listed in Table 1 and the test results of high temperature and high humidity, high and low temperature impact, destructive boiling water bath, etc. show that: the ultraviolet curable adhesive of the present invention has fast curing speed, low curing shrinkage rate, high bonding strength with glass and metal, and is durable. It ha...

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Abstract

The invention provides a UV curing packaging adhesive for a liquid crystal display. Based on 100 weight parts, the adhesive consists of following components: 40 to 70 parts of prepolymer, 20 to 50 parts of active diluent monomer, 1 to 8 parts of photoinitiator, and 0.1 to 5 parts of assistant. The prepolymer is one or a mixture of more of the urethane acrylate, epoxy acrylate and polyster acrylate. The UV curing packaging adhesive for the liquid crystal display has the characteristics of high curing speed, low shrinkage rate and excellent damp heat resistance.

Description

technical field [0001] The invention relates to an adhesive, in particular to an ultraviolet curing packaging adhesive for a liquid crystal display. Background technique [0002] At present, there are more than 100 manufacturers and research institutes in my country engaged in the research of liquid crystal display (LCD) devices. These LCD manufacturers all need UV curing packaging adhesives, and their market demand is huge. The main suppliers of LCD packaging adhesives in the world include Henkel Loctite, Japan’s Three Bond, Dymax and other manufacturers. Most of the adhesives used in my country rely on imports, and the research and development of UV-curable packaging adhesives for flat-panel liquid crystal displays is still relatively small in my country. UV curing packaging adhesives are mainly composed of prepolymers, reactive diluent monomers, photoinitiators, and additives. Among them, prepolymer and active diluent monomer are photosensitive components, which play a d...

Claims

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Application Information

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IPC IPC(8): C09J175/14C09J163/10C09J167/06C09K3/10G02F1/1339
Inventor 郭嘉咏
Owner BEIJING HYSTIC NEW MATERIALS
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