Optical adhesive and preparation method thereof

A technology of optical glue and isocyanate, applied in the direction of adhesives, adhesive types, polyurea/polyurethane adhesives, etc., can solve the problems of touch screen product quality decline, short service life of optical glue, yellowing, etc., to achieve yellowing and aging The speed drops, the anti-yellowing performance is excellent, and the effect of improving the service life

Inactive Publication Date: 2014-10-15
TAICANG ZHANXIN ADHESIVE MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, epoxy acrylates and bisphenol A epoxy acrylic resins are prone to aging and yellowing, res...

Method used

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  • Optical adhesive and preparation method thereof
  • Optical adhesive and preparation method thereof
  • Optical adhesive and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] An optical glue, comprising:

[0028]

[0029] Prepared as follows:

[0030] (1) Preparation of polyurethane acrylate prepolymer

[0031] Add in the flask: heat 129g (0.0645mol) polytetrahydrofuran diol (molecular weight 2000, PTMGE-2000, BASF), 108g (0.036mol) polycaprolactone diol (molecular weight 3000, Daicel, Japan) to 115°C , vacuum dehydration for 2 hours, adopt the Karl Fischer method to measure the moisture content to be below 0.05%, add 0.095g (0.00015mol) dibutyltin dilaurate as catalyst, heat up to 100°C, add dropwise 42.5g (0.17mol) 2 , 2-diphenylmethane diisocyanate, stirred and reacted for 5 hours, then added 12.6g (0.15mol) methacrylate, 0.35g (0.000554mol) dibutyltin dilaurate, 0.16g (0.0007mol) 2-hydroxy- 4-methoxybenzophenone, reacted at 85°C for 7 hours, after the reaction was completed, the isocyanate was measured by infrared spectroscopy at 2270cm -1 The stretching vibration front at the position drops to the same, that is, the isocyanate gro...

Embodiment 2

[0035] An optical glue comprising

[0036]

[0037] Prepared as follows:

[0038] (1) Preparation of polyurethane acrylate prepolymer

[0039] Add in the flask: heat 129g (0.0645mol) polytetrahydrofuran diol (molecular weight 2000, PTMGE-2000, BASF), 108g (0.036mol) polycaprolactone diol (molecular weight 3000, Daicel, Japan) to 115°C , vacuum dehydration for 2 hours, adopt Karl Fischer method to measure moisture content to be below 0.05%, add 0.095g (0.00015mol) dibutyltin dilaurate as catalyst, be warming up to 115 ℃, drop 45g (0.18mol) 2, 2-Diphenylmethane diisocyanate, stirred for 5 hours, then added 15.1g (0.18mol) methacrylate, 0.35g (0.000554mol) dibutyltin dilaurate, 0.18g (0.0008mol) 2-hydroxy-4 -Methoxybenzophenone, reacted at 90°C for 8 hours. After the reaction was completed, the isocyanate was measured at 2270cm by infrared spectroscopy. -1 The stretching vibration front at the position drops to the same, that is, the isocyanate group reacts completely, and ...

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PUM

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Abstract

The invention discloses an optical adhesive, which is prepared from the following ingredients in parts by weight through mixing: 35-38 parts of polyurethane-acrylate prepolymer, 0.4-0.8 part of 2-hydroxy-4-methoxybenzophenone, 8-12 parts of isobornyl acrylate, 35-40 parts of a plasticizer, 6-8 parts of a coupling agent, 2-3 parts of a photoinitiator and 1-2 parts of an antioxidant. The invention further discloses a preparation method for the optical adhesive, which comprises the following steps: uniformly mixing the polyurethane-acrylate prepolymer, the 2-hydroxy-4-methoxybenzophenone, isobornyl acrylate, the plasticizer, the coupling agent, the photoinitiator and the antioxidant, heating the mixture to 50-80 DEG C, stirring for reaction for 1.5-1.8 h, performing vacuum-pumping for removing bubbles, and cooling, so that the optical adhesive is prepared. The optical adhesive provided by the invention has the advantages as follows: yellowing and ageing speed of the optical adhesive is lowered in the use process greatly, the service life of the optical adhesive is prolonged, and the refractive index of the optical adhesive is increased.

Description

technical field [0001] The invention relates to an optical glue and a preparation method thereof. Background technique [0002] Optical glue is colorless and transparent, has good bonding strength, can be cured at room temperature, and has little curing shrinkage. It is mainly used for the bonding of electronic paper, transparent devices, projection screen assembly, display assembly, lens assembly, resistive touch screen, capacitive touch screen, panels and other related electronic optical devices. There are many kinds of optical adhesives due to the different raw materials used or the different dosages of the same raw materials. At present, optical adhesives generally choose bisphenol A epoxy acrylic resin or acrylic acid containing sulfur elements as the main resin. In order to obtain stronger bonding strength, epoxy acrylate is generally selected. However, epoxy acrylates and bisphenol A epoxy acrylic resins are prone to aging and yellowing, resulting in a short service...

Claims

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Application Information

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IPC IPC(8): C09J175/14C09J11/06C08G18/67C08G18/66C08G18/48C08G18/42C08G18/12
Inventor 瞿清钱健陈振东
Owner TAICANG ZHANXIN ADHESIVE MATERIAL
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