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Two-component reactive polyurethane hot melt adhesive and preparation method thereof

A polyurethane hot-melt adhesive and reactive technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of inability to meet the bonding needs of electronic products, slow curing speed of hot melt adhesives, and slow curing speed Slow and other problems, to achieve the effect of fast curing speed, high initial bonding strength and high curing strength

Inactive Publication Date: 2020-04-17
YANTAI DARBOND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the one-component reactive hot melt adhesive has the problems of slow curing speed, low strength and surface pores. If the strength is not high enough, it cannot meet the structural bonding needs of electronic products; the curing speed is slow, and it takes seven days or more to fully cure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A two-component reactive polyurethane hot melt adhesive, including component A and component B mixed in a weight ratio of 1:1;

[0033] Among them, component A includes polybutylene adipate 40kg, PPG 30kg, 1,4 butanediol 3kg, terpene phenolic resin 10kg, 0.04kg organic bismuth and 40kg MDI;

[0034] Component B includes 40kg of polybutylene adipate, 30kg of PPG, 3kg of 1,4 butanediol, 10kg of terpene phenolic resin, 0.04kg of organic bismuth and 11kg of MDI.

[0035] The preparation method of above-mentioned two-component reactive polyurethane hot-melt adhesive, the steps are as follows:

[0036] (1) Preparation of component A

[0037] Take 40kg of polybutylene adipate, 30kg of PPG, 3kg of 1,4 butanediol and 10kg of terpene phenolic resin, stir and dehydrate at 130°C for 2 hours in a molten state, then cool down to 60°C, add 0.04kg of organic bismuth and 40kg of molten MDI, reacted for 0.5h, then raised the temperature to 80°C, reacted for 1h under vacuum, then raised...

Embodiment 2

[0042] A two-component reactive polyurethane hot melt adhesive, including component A and component B mixed in a weight ratio of 1:1;

[0043] Among them, A component includes phthalic anhydride diethylene glycol 10kg, polybutylene adipate 30kg, PPG 30kg, hydroquinone dihydroxyethyl ether 3kg, terpene phenolic resin 10kg, 0.04kg organic bismuth and 46kg MDI ;

[0044] Component B includes 10kg of phthalic anhydride diethylene glycol, 30kg of polybutylene adipate, 30kg of PPG, 3kg of hydroquinone dihydroxyethyl ether, 10kg of terpene phenolic resin, 0.04kg of organic bismuth and 13kg of MDI.

[0045] The preparation method of above-mentioned two-component reactive polyurethane hot-melt adhesive, the steps are as follows:

[0046] (1) Preparation of component A

[0047]Take 10kg of phthalic anhydride diethylene glycol, 30kg of polybutylene adipate, 30kg of PPG, 3kg of hydroquinone dihydroxyethyl ether, and 10kg of terpene phenolic resin, stir and dehydrate at 140°C for 2 hours...

Embodiment 3

[0052] A two-component reactive polyurethane hot melt adhesive, including component A and component B mixed in a weight ratio of 1:1;

[0053] Among them, component A includes polycaprolactone diol 10kg, polybutylene adipate 30kg, PPG 30kg, hydroquinone dihydroxyethyl ether 3kg, polyacrylate resin 10kg, organic bismuth 0.04kg and 51kg MDI;

[0054] Component B includes 10kg of polycaprolactone diol, 30kg of polybutylene adipate, 3kg of hydroquinone dihydroxyethyl ether, 10kg of polyacrylate resin, 0.04kg of organic bismuth and 17kg of MDI.

[0055] The preparation method of above-mentioned two-component reactive polyurethane hot-melt adhesive, the steps are as follows:

[0056] (1) Preparation of component A

[0057] Take polycaprolactone diol 10kg, polybutylene adipate 30kg, PPG 30kg, hydroquinone dihydroxyethyl ether 3kg, polyacrylate resin 10kg, stir and dehydrate at 140°C for 2 hours , then lower the temperature to 60°C, add 0.04kg organic bismuth and 51kg molten MDI, r...

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Abstract

The invention belongs to the technical field of hot melt adhesives, and particularly relates to a two-component reactive polyurethane hot melt adhesive and a preparation method thereof. According to the invention, a single-component reaction type hot melt adhesive is changed into a double-component reaction type hot melt adhesive; under the combined action of an isocyanate group-terminated polyurethane prepolymer and a hydroxyl-terminated polyurethane prepolymer, the obtained two-component reactive polyurethane hot melt adhesive has the advantages of high initial adhesion strength, quick positioning, high curing speed and high curing strength; the adhesive is wide in applicable base material range and small in shrinkage, can meet the requirement for bonding of most structural parts, and can be widely applied to structural bonding of electronics, industries and the like, the strength can be increased to 5-8 MPa within one hour, and the strength can reach about 15 MPa within 24 hours.

Description

technical field [0001] The invention belongs to the technical field of hot-melt adhesives, in particular to a two-component reactive polyurethane hot-melt adhesive and a preparation method thereof. Background technique [0002] With the rapid development of the hot melt adhesive industry in the field of electronic applications, it has penetrated into various application fields in the national economy. With the increasing awareness of environmental protection, solvent-based adhesives are gradually restricted. Environmentally friendly hot-melt adhesives are future development trend. Reactive polyurethane hot melt adhesive (HMPUR, PUR for short) is a one-component polyurethane adhesive that is solid at room temperature. When in use, the glue is melted by heating, and the glue layer is cooled and solidified to produce preliminary physical adhesion. The NCO-terminated polyurethane prepolymer in the adhesive layer reacts with the moisture in the air and the active hydrogen compo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/06C09J175/08C09J11/08C08G18/76C08G18/66C08G18/48C08G18/42C08G18/32
CPCC08G18/3206C08G18/3215C08G18/4018C08G18/4202C08G18/4238C08G18/4277C08G18/4825C08G18/6607C08G18/7671C09J11/08C09J175/06C09J175/08C08L61/14C08L33/08
Inventor 韩红伟王建斌陈田安解海华
Owner YANTAI DARBOND TECH