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Packaging adhesive for OLED flexible display screen and preparation method thereof

A technology of flexible display and encapsulation adhesive, applied in the direction of adhesive, modified epoxy resin adhesive, adhesive type, etc., to achieve the effect of simple preparation method, reduced curing shrinkage rate, and good market application prospect

Active Publication Date: 2022-07-22
烟台万华聚氨酯合成材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems existing in OLED display packaging glue in the prior art, the present invention provides a kind of packaging glue for OLED flexible display and its preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: Preparation of encapsulant for OLED flexible display

[0027] (1) Weigh 35 parts by weight of acrylate oligomer and 5 parts by weight of liquid rubber, and mix them uniformly to obtain a modified prepolymer. The acrylate oligomer is aliphatic polyurethane acrylate oligomer, and the liquid rubber is liquid isoprene rubber.

[0028] (2) 20 parts by weight of monofunctional acrylate and 20 parts by weight of multifunctional acrylate are weighed and mixed uniformly to obtain a modified acrylic monomer. The monofunctional acrylate is hydroxyethyl acrylate, and the multifunctional acrylate is neopentyl glycol dimethacrylate.

[0029] (3) First, the modified prepolymer prepared in step (1) and the modified acrylic monomer prepared in step (2) were mixed at 80° C. for 4 hours at a rotation speed of 300 rpm, and mixed once. Then add 8 parts by weight of photoinitiator and 3 parts by weight of coupling agent, mix for 2 hours at 35 ° C and 300 rpm, and perform seconda...

Embodiment 2

[0030] Example 2: Preparation of encapsulant for OLED flexible display

[0031] (1) Weigh 24 parts by weight of acrylate oligomer and 6 parts by weight of liquid rubber, and mix them uniformly to obtain a modified prepolymer. Described acrylate oligomer is 12 parts by weight of aromatic polyurethane acrylate oligomer and 12 parts by weight of pure acrylate resin oligomer, and described liquid rubber is 3 parts by weight of liquid polybutadiene rubber and 3 parts by weight of parts of liquid polystyrene butadiene rubber.

[0032] (2) 20 parts by weight of monofunctional acrylate and 10 parts by weight of multifunctional acrylate are weighed and mixed uniformly to obtain a modified acrylic monomer. The monofunctional acrylate is 10 parts by weight of hydroxypropyl acrylate and 10 parts by weight of isobornyl acrylate, and the multifunctional acrylate is 5 parts by weight of tripropylene glycol dimethacrylate and 5 parts by weight of dimethyl acrylate. based on ethylene glycol ...

Embodiment 3

[0034] Example 3: Preparation of encapsulant for OLED flexible display

[0035] (1) 36 parts by weight of acrylate oligomer and 9 parts by weight of liquid rubber were weighed and mixed uniformly to obtain a modified prepolymer. The acrylate oligomer is 18 parts by weight of aliphatic polyurethane acrylate oligomer and 18 parts by weight of bisphenol A epoxy diacrylate oligomer, and the liquid rubber is liquid polybutadiene rubber.

[0036] (2) 29 parts by weight of monofunctional acrylate and 16 parts by weight of multifunctional acrylate are weighed and mixed uniformly to obtain a modified acrylic monomer. The monofunctional acrylate is 16 parts by weight of hydroxyethyl methacrylate and 13 parts by weight of hydroxypropyl methacrylate, and the multifunctional acrylate is 8 parts by weight of diethylene glycol dimethacrylate and 8 parts by weight. Parts by weight of 1,6 hexanediol dimethacrylate.

[0037] (3) First, the modified prepolymer prepared in step (1) and the modi...

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Abstract

The invention provides a packaging adhesive for an OLED flexible display screen and a preparation method of the packaging adhesive. The packaging adhesive is prepared from the following components in parts by weight: 30 to 45 parts of a modified prepolymer, 30 to 45 parts of a modified acrylic monomer, 5 to 10 parts of a photoinitiator and 1 to 10 parts of an auxiliary agent. The modified prepolymer is composed of an acrylate oligomer and liquid rubber, and the weight ratio of the acrylate oligomer to the liquid rubber is (4-7): 1. The modified acrylic monomer is composed of monofunctional acrylate and polyfunctional acrylate, and the weight ratio of the monofunctional acrylate to the polyfunctional acrylate is (1-4): 1. According to the packaging adhesive disclosed by the invention, the modified prepolymer and the modified acrylic monomer are compounded for use in a specific proportion, and the photoinitiator and the auxiliary agent are introduced on the basis of a synergistic effect of the two, so that the obtained packaging adhesive remarkably improves the bending resistance of the OLED flexible display screen, also effectively reduces the water permeability, and is low in preparation cost and environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of adhesives, and relates to an encapsulation adhesive, in particular to an encapsulation adhesive for an OLED flexible display screen and a preparation method thereof. Background technique [0002] OLED display is a display screen made of organic light-emitting body. It has the characteristics of self-luminescence, no light source, high contrast ratio, thin thickness, wide viewing angle and fast response speed. It is considered as an emerging application technology of next-generation flat-panel displays. Compared with traditional LCD screens, OLED screens undoubtedly have significant advantages; most notably, based on their lightness and thinness, OLED screens can be made into flexible screens that bend and fold. Compared with the traditional rigid screen, the flexible screen has good flexibility, light and thin volume, low power consumption, and resistance to rubbing. With the comprehensive upgrade of ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/14C09J133/00C09J163/10C09J109/00C09J109/06
CPCC09J175/14C09J133/00C09J163/10C08L9/00C08L33/00C08L9/06C08L75/14C08L63/10Y02E10/549
Inventor 刘士锋李兵帅邱昭鹏
Owner 烟台万华聚氨酯合成材料有限公司
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