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Two-part curable adhesive composition

A curing type and adhesive technology, which is applied in the direction of non-polymer adhesive additives, adhesives, polyurea/polyurethane adhesives, etc., can solve the problems of reduced tensile properties and foaming of cured products, and achieve the purpose of inhibiting foaming. Excellent foaming and tensile properties, and low temperature dependence

Active Publication Date: 2021-05-04
THE YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the adhesive composition is rapidly cured using a catalyst, foaming may occur, thereby causing a problem that the tensile properties of the cured product are reduced.

Method used

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  • Two-part curable adhesive composition
  • Two-part curable adhesive composition
  • Two-part curable adhesive composition

Examples

Experimental program
Comparison scheme
Effect test

experiment example

[0125] In order to investigate the effects of the present invention, adhesive compositions were prepared according to the compounding quantities shown in Tables 1 to 3, and the foamability, usable time, breaking strength, elongation at break, and stored energy of the cured product were measured. Elastic Modulus.

[0126] Urethane prepolymers 1 to 4 were prepared in the following manner, and the additives shown in the table were added to prepare the main ingredient. In addition, the raw materials shown in the table were mixed to prepare a curing agent.

[0127]

[0128] 100 g of polytetramethylene ether glycol and 100 g of 4,4'-diphenylmethane diisocyanate (index 4.0) were stirred at 80°C for 4 hours in a nitrogen atmosphere to react to synthesize a carbamate Prepolymer 1.

[0129]

[0130] 100 g of polytetramethylene ether glycol and 150 g of 4,4'-diphenylmethane diisocyanate (index 6.0) were stirred at 80°C for 4 hours in a nitrogen atmosphere to react to synthesize car...

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PUM

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Abstract

This two-part curable adhesive composition comprises: a main agent (A) containing a urethane prepolymer (a1) and a residual polyisocyanate (a2); and a curing agent (B) comprising an amorphous polyol compound (b1) and a polyamine compound (b2). The equivalent ratio of isocyanate groups within a raw material polyisocyanate to hydroxyl groups within the polyol compound is 2.05-12. The equivalent ratio of isocyanate groups within the main agent (A) to amine groups within the polyamine compound (b2) is 1.2-6. The equivalent ratio of isocyanate groups within the main agent (A) to hydroxyl groups within the amorphous polyol compound (b1) is 2-12.

Description

technical field [0001] The present invention relates to a two-component curable adhesive composition comprising a main agent and a curing agent. Background technique [0002] In structural bodies such as automobile bodies, parts made of dissimilar materials may be bonded together using an adhesive. By bonding via an adhesive, even if the difference in thermal expansion coefficient between members is large, the occurrence of strain and warpage can be suppressed. On the other hand, adhesives used in such applications are required to have good tensile properties such as breaking strength and elongation at break in a cured state as a criterion of adhesive strength. [0003] As an adhesive composition capable of obtaining a cured product excellent in elongation at break, a two-component curing type comprising a main ingredient containing a urethane prepolymer and a curing agent containing a compound having an active hydrogen group is known. polyurethane adhesive composition. F...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/04C09J11/04C09J11/06C09J175/06C09J175/08
CPCC09J175/06C09J175/08C08G18/4854C08G18/7671C08G18/44C08G18/10C08G18/4845C08G18/324C08G18/69C08G18/3206C08G18/6529C08G18/6685C09J175/04
Inventor 木村和资影山裕一山元裕太郎
Owner THE YOKOHAMA RUBBER CO LTD