Composition for forming reaction type polyurethane hot-melt adhesive and hot-melt adhesive

A technology of polyurethane hot-melt adhesives and compositions, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve problems such as poor storage stability, and achieve the effect of improving storage stability

Inactive Publication Date: 2009-05-06
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the shortcoming of the poor storage stability of reactive polyurethane hot melt adhesives in the prior art, to provide a composition with good storage stability for forming reactive polyurethane hot melt adhesives and the composition formed by the composition Reactive polyurethane hot melt adhesive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This example illustrates the composition for forming a reactive polyurethane hot melt adhesive of the present invention and the reactive polyurethane hot melt adhesive formed from the composition.

[0030]Drop into the polyoxypropylene glycol of 70 weight parts (PPG, Jinling Petrochemical Production, number-average molecular weight 1000, hydroxyl value 30mgKOH / g) in the reactor that thermometer, agitator and condensing unit are housed with vacuum dehydration unit Stir and dehydrate at 110°C for 2.5 hours under a vacuum of 0.07 MPa, then cool down to 45°C and add 17 parts by weight of 4,4′-diphenylmethylene diisocyanate (MDI-100HL, produced by Yantai Wanhua Polyurethane Co., Ltd. , the content of isocyanate group is 29% by weight), under the protection of nitrogen, heat up to 80 ℃ of contact reaction 1.5 hours to obtain the polyurethane prepolymer of isocyanate group termination, add the chain extender 1 of 3 weight parts again, 4-butanediol React for 20 minutes, then lo...

Embodiment 2

[0034] This example illustrates the composition for forming a reactive polyurethane hot melt adhesive of the present invention and the reactive polyurethane hot melt adhesive formed from the composition.

[0035] Drop into the polybutylene adipate diol (PBA of 50 weight parts in the reactor that thermometer, agitator and condensing unit are housed with vacuum dehydration device, Jinling petrochemical production, number-average molecular weight 1000, hydroxyl value 32mgKOH / g) and 15 parts by weight of polytetrahydrofuran diol (PTMG, produced by Shanghai Gaoqiao Petrochemical, number average molecular weight 2000, hydroxyl value 58mgKOH / g) were stirred and dehydrated for 3 hours under a vacuum of 0.07 MPa at 100°C , then cool down to 40°C and add 25 parts by weight of 4,4'-diphenylmethylene diisocyanate (MDI-100HL, produced by Yantai Wanhua Polyurethane Company, the content of isocyanate group is 29% by weight), under nitrogen protection , heated up to 70°C for 3 hours of contac...

Embodiment 3

[0037] This example illustrates the composition for forming a reactive polyurethane hot melt adhesive of the present invention and the reactive polyurethane hot melt adhesive formed from the composition.

[0038] Drop into the polyhexamethylene adipate diol of 50 weight parts (Jinling Petrochemical Production, number-average molecular weight 2000, hydroxyl value 80mgKOH / g) and 16 parts by weight of polytetrahydrofuran diol (PTMG, Shanghai Gaoqiao Petrochemical production, number average molecular weight 3000, hydroxyl value 90mgKOH / g) was stirred and dehydrated for 2 hours under a vacuum of 0.09 MPa at 120 ° C, and then Cool down to 45°C and add 18 parts by weight of 4,4'-diphenylmethylene diisocyanate (MDI-100HL, produced by Yantai Wanhua Polyurethane Co., Ltd., the content of isocyanate group is 29% by weight), under the protection of nitrogen, the temperature rises Contact reaction at 80°C for 1.5 hours to obtain isocyanate-terminated polyurethane prepolymer, then add 5 pa...

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Abstract

The invention provides a composition for forming a reactive polyurethane hot melt adhesive, which contains polylol, isocyanate and a chain extendor, wherein the composition also contains a sealant, the sealant is an organic compound with at least one functional group containing active hydrogen, and the sealant can perform a nucleophilic addition reaction with an isocyanate group. The invention can greatly improve the storage stability of the polyurethane hot melt adhesive by adding the sealant into the composition for forming the polyurethane hot melt adhesive.

Description

technical field [0001] The present invention relates to a composition for forming hot-melt adhesive and the hot-melt adhesive formed by the composition, in particular to a composition for forming reactive polyurethane hot-melt adhesive and the reactive polyurethane hot-melt adhesive formed by the composition Polyurethane hot melt adhesive. Background technique [0002] Reactive polyurethane hot melt adhesive is a kind of coating under melting conditions, curing, and then the isocyanate end group reacts with the moisture or active hydrogen atoms in the air or substrate to further cure, so as to obtain high bond strength. Reactive polyurethane hot-melt adhesives have good solvent resistance and high temperature resistance, and do not require solvents during coating, so the market demand continues to increase. [0003] At present, the isocyanate group-terminated polyurethane prepolymer is usually prepared by the prepolymer method, and other additives are added to prepare the r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/04C08G18/48C08G18/42C08G18/24
Inventor 杨志祥张文娟
Owner BYD CO LTD
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