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Preparation of an anti-yellowing liquid optical glue

An optical adhesive, liquid technology, used in adhesives, adhesive types, polyurea/polyurethane adhesives, etc., can solve problems such as large volume shrinkage, brittle cured film, yellowing, etc.

Active Publication Date: 2016-06-08
江苏矽时代材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] At present, in order to obtain a higher refractive index, aliphatic urethane acrylate is usually selected together with a high-refractive monomer containing more benzene rings to increase the refractive index of the glue, so it is difficult to avoid the occurrence of glue under conditions such as ultraviolet rays and humid heat. The problem of yellowing, and there are shortcomings such as large volume shrinkage after curing, and the cured film is relatively brittle

Method used

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  • Preparation of an anti-yellowing liquid optical glue
  • Preparation of an anti-yellowing liquid optical glue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Prepare aliphatic urethane acrylate prepolymer, denoted as prepolymer A, and the preparation method is as follows:

[0034] Add 63g of polypropylene glycol (PPG-2000) and 125g of polytetrahydrofuran glycol (PTMEG-3000, BASF) into a flask equipped with a thermometer, an exhaust port, and a stirring device, dehydrate in vacuum at 110°C for 2 hours, remove the vacuum, and pass nitrogen protection , add 0.2g catalyst dibutyltin dilaurate, drop to 70 ℃, add dropwise 62g isophorone diisocyanate, react for 3h, then add dropwise 35g hydroxyethyl acrylate, 0.12g dibutyltin dilaurate, tert-butyl p- Hydroquinone, continue to react for 5h, measure free NCO content <0.5% by titration method, and obtain prepolymer A with a viscosity of 10000-12000cps and a refractive index of 1.465-1.470.

Embodiment 2

[0036] Prepare the aromatic urethane acrylate prepolymer, denoted as prepolymer B, and the preparation method is as follows:

[0037] Add 35g of polybutadiene diol (molecular weight 2500-2800) and 61g of polycarbonate diol (PCDL-2000) into a flask equipped with a thermometer, an air inlet and a stirring device, dehydrate under vacuum at 110°C for 2 hours, remove Vacuum, nitrogen protection, add 0.14g catalyst dibutyltin dilaurate, lower to 70°C, add dropwise 30g toluene diisocyanate, react for 3h, then add dropwise 25g hydroxyethyl acrylate, 0.08g dibutyltin dilaurate, tert-butyl Base hydroquinone, continue to react for 5h, and measure the free NCO content <0.5% by titration method to obtain prepolymer B with a viscosity of 5500-6500cps and a refractive index of 1.527-1.530.

Embodiment 3

[0039] Prepare epoxy acrylate prepolymer, denoted as prepolymer C, preparation method is as follows:

[0040] Add 220g of hydrogenated bisphenol A epoxy resin to a flask equipped with a thermometer, an exhaust port and a stirring device, vacuum dehydrate at 110°C for 2 hours, remove the vacuum, pass nitrogen protection, cool down to 100°C, and add 0.6g of catalyst triphenyl Phosphine and 0.4g tetramethylammonium bromide, polymerization inhibitor tert-butyl hydroquinone, drop 50g to continue the reaction for 5h, the acid value of the system was determined by titration method to obtain prepolymer C, viscosity 15000-18000cps, refractive index 1.570-1.575.

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Abstract

An anti-yellowing liquid optical adhesive composed of various modified acrylate resins, in parts by weight, including: epoxy acrylate (10-20 parts), aliphatic urethane acrylate (60-70 parts), aromatic family of urethane acrylates (1-10 parts), acrylate monomers (1-15 parts) and photoinitiators (1-3 parts). The optical glue of the present invention has the advantages of high refraction, high light transmittance (>99%), resistance to heat and humidity without yellowing, ultra-low hardness (Shore E 2-10) and extremely low volume shrinkage.

Description

technical field [0001] The invention relates to a UV adhesive material, more specifically, to the preparation of an anti-yellowing liquid optical adhesive for laminating capacitive touch screen ITO glass and glass. Background technique [0002] Due to the addition of operating systems such as ISO, Windows7 and Android, the new generation of smart operating systems provides a more advanced user interface and more functional applications, and also correspondingly increases the requirements for touch screens. Influenced by Apple's iPhone and iPad, capacitors Touch screen is gradually becoming a mainstream touch technology, and the year-on-year growth of touch screen shipments is very stable. In 2009, there were nearly 10 different touch technologies on the market, but in 2010, projected capacitive touch has become the first choice of many international manufacturers due to its simplicity, low cost, and multi-touch advantages. my country has a huge production base of touch scre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/14C09J163/10
Inventor 熊璠朱令干
Owner 江苏矽时代材料科技有限公司