Polyurethane structural adhesive having long working life and increasing rapidly in strength and preparation method thereof

A polyurethane and pot life technology, which is applied in the field of two-component polyurethane structural adhesives, can solve the problems of strong irritating odor and short operation time (generally no more than 30 minutes), so as to improve the hardness and strength after curing, and prolong the operation time , the effect of high boiling point

Inactive Publication Date: 2018-06-01
HUBEI HUITIAN NEW MATERIALS STOCK CO LTD +3
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The two-component acrylic structural adhesive has a simple process and can be mixed according to the visual weight ratio. Because of its advantages such as fast curing speed, it is widely used; but its disadvantages are obvious when used, such as short operating time (generally not more than 30 minutes), and there is a strong pungent smell, etc.

Method used

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  • Polyurethane structural adhesive having long working life and increasing rapidly in strength and preparation method thereof

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[0044] The present invention also provides a method for preparing any of the above-mentioned polyurethane structural adhesives with long pot life and fast strength increase, comprising the following steps:

[0045] Prepare component A and component B, the sequence of preparing component A and component B is not limited;

[0046] The preparation method of component A is: add castor oil polyol, bisphenol A modified polyether triol, environment-friendly organic solvent, polyether hexaol into the reaction kettle, heat to 100°C-120°C, and vacuum Stir and dehydrate under the state for 1-2 hours, then lower the temperature to 60°C, add it to the planetary stirring mixer, then add the viscosity-increasing agent, viscosity-reducing agent, retarder and delayed catalyst, and stir for 30 minutes under vacuum. Then add inorganic fillers and molecular sieve dewatering agents, and stir for 2 hours under vacuum to obtain component A;

[0047] Component B is an isocyanate curing agent compris...

Embodiment 1

[0052] In terms of mass percentage, add 35% castor oil polyol, 10% bisphenol A modified polyether triol, 5% environmentally friendly organic solvent, and 5% polyether hexaol to the reactor and heat to 100°C-120°C , and stirred and dehydrated under vacuum for 1 to 2 hours, then cooled to 60 ° C, added to the planetary mixer, and then added 0.5% viscosity-increasing additive, 1.1% viscosity reducing agent, 0.3% polymerization retarder and 0.2 % delayed catalyst, stirred under vacuum for 30 minutes, then added 37.3% inorganic filler, 5.6% molecular sieve dewatering agent, stirred under vacuum for 2 hours to obtain component A;

[0053] Component B is an isocyanate curing agent comprising liquefied diphenylmethane diisocyanate and polyphenyl polymethylene polyisocyanate;

[0054] Pack components A and B separately, and mix components A and B at a mass ratio of 5:1 to obtain a polyurethane structural adhesive with a long pot life and rapid strength increase.

Embodiment 2

[0056] In terms of mass percentage, add 20% castor oil polyol, 12% bisphenol A modified polyether triol, 10% environmentally friendly organic solvent, and 11.5% polyether hexaol to the reactor and heat to 100 ° C ~ 120 ° C , and stirred and dehydrated under vacuum for 1 to 2 hours, then cooled to 60 ° C, added to the planetary stirring mixer, and then added 1.0% viscosity-increasing additive, 0.4% viscosity reducing agent, 0.3% polymerization retarder and 0.2 % delayed catalyst, stirred under vacuum for 30 minutes, then added 37% inorganic filler, 7.6% molecular sieve dewatering agent, stirred under vacuum for 2 hours to obtain component A;

[0057] Component B is an isocyanate curing agent comprising liquefied diphenylmethane diisocyanate and polyphenyl polymethylene polyisocyanate;

[0058] Pack components A and B separately, and mix components A and B at a mass ratio of 5:1 to obtain a polyurethane structural adhesive with a long pot life and rapid strength increase.

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Abstract

The invention discloses a polyurethane structural adhesive having long working life and increasing rapidly in strength. The polyurethane structural adhesive is prepared from a component A and a component B, wherein the component A and the component B are mixed according to a mass ratio of 5 to 1, the component A is prepared from the following components by mass percent: 5%-40% of castor oil polyalcohol, 5%-45% of bisphenol A modified polyether triols, 5%-15% of environment-friendly organic solvent, 5%-28% of polyether hexahydric alcohol, 20%-75% of inorganic filler, 0.3%-3.5% of tackifier additive, 0.3%-3.5% of viscosity reducer, 0.3%-3.5% of retarder, 2%-8% of molecular sieve dehydrator, and 0.05%-1% of delaying catalyst, and the component B is an isocyanate curing agent being prepared from liquefied diphenylmethane diisocyanate and polyphenylpolymethylene polyisocyanate. The invention further discloses a preparation method of the polyurethane structural adhesive. The polyurethane structural adhesive has the advantage of the bi-component acrylic ester adhesive, and has the advantages of having no pungent odor, having long working life and increasing rapidly in strength at the sametime.

Description

technical field [0001] The invention relates to the field of two-component polyurethane structural adhesives, in particular to a polyurethane structural adhesive with long pot life and fast strength increase and a preparation method thereof. Background technique [0002] The two-component acrylic structural adhesive has a simple process and can be mixed according to the visual weight ratio. Because of its advantages such as fast curing speed, it is widely used; but its disadvantages are obvious when used, such as short operating time (generally not more than 30 minutes), and there is a strong pungent smell, etc. Especially in a closed environment, such as the automobile manufacturing industry, there is still a pungent smell after being placed for a long time. Therefore, it is generally expected to have a structural adhesive that is environmentally friendly, has a long operating time, and has a fast strength increase. [0003] The two-component polyurethane adhesive has exc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/14C09J11/06C09J11/08C08G18/76C08G18/67C08G18/48C08G18/08
CPCC08G18/0852C08G18/089C08G18/36C08G18/4829C08G18/7664C08G18/7671C09J11/06C09J11/08C09J175/14
Inventor 冯涛杨足明韩胜利吴正明章锋
Owner HUBEI HUITIAN NEW MATERIALS STOCK CO LTD
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