Optical adhesive and preparation method thereof

Abstract

The invention relates to an optical adhesive and a preparation method thereof, the optical adhesive comprises, by weight 45-80 parts of polyester polyurethane acrylate; 10-40 parts of a reactive diluent; 0.5-6 parts of a photoinitiator; 1-10 parts of a filler and 0.5-5 parts of an additive. The optical adhesive is mainly applied to mobile phone, tablet personal computer and other electronics industries, aims at slow OCA and LOCA curing speed, poor adhesion strength, poor solvent resistance, poor adhesive body strength and other defects, can achieve the functions of protective coating, adhesion and filling and the like of glass surface or the glass surface treated with a coating , and has the advantages of no solvent, single component, fast curing speed, excellent adhesion, high adhesive body strength, good solvent resistance, good damp heat resistance and the like.

Description

technical field [0001] The invention relates to an adhesive and a preparation method thereof, in particular to an optical adhesive and a preparation method thereof. Background technique [0002] Optical adhesives are widely used in the electronics industry. OCA film and LOCA are commonly used in the market. The main components are acrylate polymers and rubber-modified elastomers. The cured cross-linking density is low, and they are mainly used for LCD touch screens. In the bonding process of the screen, the filling and bonding between the touch screen and the LCD module has the advantages of yellowing resistance, elasticity, low hardness, high light transmittance, low haze, etc., and also has the advantages of slow curing speed and sticky Disadvantages such as poor relay, poor colloid body strength, and poor solvent resistance. At present, most of OCA and LOCA can only play the role of filling, and the adhesion to the glass surface is not enough, especially in the case of a...

AI Technical Summary

Problems solved by technology

[0002] Optical adhesives are widely used in the electronics industry. OCA film and LOCA are commonly used in the market. The main components are acrylate polymers and rubber-modified elastomers. The cured cross-linking density is low, and they are mainly used for LCD touch screens. In the bonding process of the screen, the filling and bonding between the touch screen and the LCD module has the advantages of yellowing resistance, elasticity, low hardness, high light transmittance, low haze, etc., and also has the advantages of slow curing speed and sticky Disadvantages such as poor relay, poor colloidal body strength, and poor solvent resistance

At present, most of OCA and LOCA can only play the role of filling, and the adhesion to the glass surface is not enough, especially in the case of a thin adhesive layer (below 50 microns), it is difficult to meet the requirement of 5B adhesion of 100 cells, and the resistance Boiling water, solvent resistance and other poor performance

[0003] In the process of processing the cover glass of mobile phones, tablets, and TV sets, the commonly used coatings are mainly solvent-based two-component coatings, which need to be ready-to-use (poor stability) when used, and need to be pre-heated during the curing process. Solvent drying (complicated process), and then photocuring to form a film; for example, mobile phone glass cover inks (white, black, etc.) are all solvent-based coatings, and require long-term high-temperature baking during the curing process, which seriously affects the product. The convenience of use and the high efficiency of production cannot meet the requirements of the electronics industry for dispensing technology

Therefore, at present, OCA and LOCA cannot achieve high-strength bonding, filling and protection for photosensitive or optically demanding components such as touch screens and cameras.

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