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Yellowing resistant liquid optical adhesive

An optical adhesive and anti-yellowing technology, applied in adhesives, adhesive types, polyurea/polyurethane adhesives, etc., can solve problems such as large curing shrinkage, reduced bonding strength, and weak bonding. Achieve excellent anti-yellowing and aging resistance, improve uniformity, and promote uniform dispersion

Active Publication Date: 2013-11-06
SHENZHEN ANLI NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, epoxy-containing acrylate epoxy acrylate or bisphenol A epoxy acrylate will inevitably yellow, and the curing shrinkage rate is large, and it is hard and brittle after curing, while sulfur-containing acrylate generally exists The disadvantages of bad smell and weak adhesion, or adding plasticizers with high refractive index, such as phthalates and tricresyl phosphate, but the plasticizers do not participate in the curing reaction, resulting in the bonding strength of the product Reduced, and phthalates and tricresyl phosphate are toxic substances, the use is restricted

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Prepare polyurethane-modified acrylate prepolymer, which is denoted as prepolymer A, and the preparation method is as follows:

[0040] Add 113g of polypropylene glycol (PPG-2000, Jiangsu Haian Petrochemical Plant) and 87g of polycaprolactone diol (molecular weight 2000, Daicel, Japan) into a flask equipped with a thermometer, an air inlet and a stirring device, and heat to 100 ℃, vacuum dehydration for 2 hours, the moisture content was determined to be less than 0.05% by Karl Fischer method, 0.2g catalyst dibutyltin dilaurate was added, the temperature was raised to 115℃, 23.8g isophorone diisocyanate and 16.5g dibutyltin dilaurate were added dropwise Cyclohexylmethane diisocyanate (HMDI), stirred for 5 hours, then added 18.9g of hydroxypropyl acrylate and 0.1g of catalyst dibutyltin dilaurate, 0.2g of 2,2,6,6-tetramethylpiperidine nitroxide , continued the reaction at 90°C for 8 hours, after the reaction was completed, the stretching vibration peak of the isocyanate g...

Embodiment 2

[0046] Prepare polyurethane modified acrylate prepolymer, denoted as prepolymer B, preparation method comprises the following steps:

[0047] Add 129g of polytetrahydrofuran diol (PTMEG-2000, molecular weight of 2000, BASF) and 107g of polycaprolactone diol (molecular weight of 3000, Japan Daicel) into a flask equipped with a thermometer, an air inlet and a stirring device, and heat to 100°C, vacuum dehydrate for 2.5h, use the Karl Fischer method to measure the moisture content below 0.05%, add 0.095g catalyst dibutyltin dilaurate, raise the temperature to 100°C, add dropwise 27g isophorone diisocyanate and 14g Dicyclohexylmethane diisocyanate (HMDI), stirred for 4 hours, then added 27.6g o-hydroxycyclohexyl methacrylate and 0.35g catalyst dibutyltin dilaurate, 0.12g2,2,6,6-tetramethyl Piperidine nitroxide free radicals, continue to react at 80°C for 6h, the reaction is completed, and the isocyanate group is measured by infrared spectroscopy at 2270cm -1 The stretching vibrat...

Embodiment 3

[0053] Prepare polyurethane modified acrylate prepolymer, denoted as prepolymer C, preparation method comprises the following steps:

[0054] Add 180g of polypropylene glycol (PPG-3000, Jiangsu Haian Petrochemical Plant) and 80g of polycaprolactone diol (molecular weight 2000, Daicel, Japan) into a flask equipped with a thermometer, an air inlet and a stirring device, and heat to 90 ℃, vacuum dehydration for 1h, the moisture content was determined to be below 0.05% by Karl Fischer method, 0.39g of catalyst dibutyltin dilaurate was added, the temperature was raised to 90°C, 26g of isophorone diisocyanate and 12.4g of bicyclic Hexylmethane diisocyanate (HMDI), stirred for 6 hours, then added 20.2g of 2-hydroxyethyl methacrylate and 0.39g of catalyst dibutyltin dilaurate, 0.26g of 2,2,6,6-tetramethylpiperidine nitrogen oxide Free radicals continued to react at 90°C for 7 hours. After the reaction was completed, the stretching vibration peak of the isocyanate group at 2270cm-1 was...

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Abstract

The invention belongs to the technical field of adhesive materials and discloses yellowing resistant liquid optical adhesive. The yellowing resistant liquid optical adhesive comprises the following components of, by mass, 30 to 40% of polyurethane modified acrylate pre-polymers, 6 to 15% of active diluent monomers, 30 to 45% of plasticizers, 5 to 10% of coupling agents, 1.5 to 4% of photoinitiators, 0.5 to 3% of antioxidants and 0.1 to 1% of yellowing resistant polymerization inhibitor A. The yellowing resistant liquid optical adhesive has the advantages of enabling the light transmittance to be larger than 99% and being high in refractive index, yellowing resistant and remarkable in ageing resistance effect due to the synergistic effect of yellowing resistant polyurethane modified acrylates and the monomers, the plasticizers, the coupling agents, the photoinitiators, the antioxidants and the like.

Description

technical field [0001] The invention relates to an adhesive material, in particular to an anti-yellowing liquid optical adhesive. Background technique [0002] Along with the rapid development of the information industry, mobile phones, notebook computers, personal digital assistants (PDAs) and other handheld entertainment electronic products have become a necessity in people's lives, and liquid crystal displays (LCDs) have gradually become the mainstream displays of these electronic products. my country is the main production place of LCD in the world, but for the special adhesive to improve the performance of LCD - liquid optical glue, almost all depends on imports, which seriously hinders the localization process of my country's LCD manufacturing industry. [0003] Liquid Optical Adhesive (LOCA) is a special adhesive that has similar optical properties to transparent optical components and has good bonding performance. It bonds two or more transparent optical components i...

Claims

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Application Information

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IPC IPC(8): C09J175/14C08G18/67
Inventor 丁小卫钱柏太欧阳涛
Owner SHENZHEN ANLI NEW MATERIALS
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