Thiol-modified polyurethane adhesive prepolymer and preparation method thereof

A technology of polyurethane adhesives and prepolymers, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of limiting the application range of mercaptans, good fluidity, and low viscosity

Inactive Publication Date: 2020-01-10
SHANDONG EFIRM BIOCHEMISTRY & ENVIRONMENTAL PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most mercaptans are small molecular substances, which make them have low viscosity and good fluidity, which greatly limits the application range of mercaptans in the field of adhesives.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0029] The application also provides a preparation method of the mercaptan-modified polyurethane adhesive prepolymer, which includes the following steps:

[0030] A) Mix the isocyanate and the initiator according to the ratio to obtain the mixture;

[0031] B) The mixture is mixed with mercaptan, and after reaction, a mercaptan-modified polyurethane adhesive prepolymer is obtained.

[0032] In the preparation process, the application first mixes the isocyanate and the initiator according to the ratio to obtain a mixture; the mixing temperature is 10-30°C, and the mixing time is 0.5-2h. The mixing is carried out under stirring conditions to make the two uniformly dispersed.

[0033] The application then mixes the mixture with the thiol compound, and obtains the thiol modified polyurethane adhesive prepolymer after the reaction. In the above reaction, it is preferably carried out under vacuum stirring conditions, the vacuum degree of the vacuum stirring conditions is ≤-0.095MPa, the re...

Embodiment 1

[0037] (1) Add 40g of 1,6-hexamethylene diisocyanate and 5g of dibutyltin dichloride to the reaction kettle, and stir at 25°C for 1 hour to make the two uniformly dispersed to obtain a mixture;

[0038] (2) In the mixture obtained in step (1), after adding 960 g of pentaerythritol tetrakis (3-mercaptopropionate), the temperature is increased to 70°C, and the degassing and stirring reaction is performed for 6 hours under the condition of vacuum degree ≤ -0.095MPa to obtain Thiol modified polyurethane adhesive prepolymer.

[0039] After testing, the mercapto group content of the mercaptan-modified polyurethane adhesive prepolymer provided in Example 1 of the present invention is 25.3%, the NCO content is 0.2%, and the viscosity is 5400 mpa*s.

Embodiment 2

[0041] (1) Add 80g of 1,6-hexamethylene diisocyanate and 5g of dibutyltin dichloride to the reaction kettle and stir at 25°C for 1 hour to make the two uniformly dispersed to obtain a mixture;

[0042] (2) In the mixture obtained in step (1), after adding 920 g of pentaerythritol tetrakis (3-mercaptopropionate), the temperature is raised to 70°C, and the degassing and stirring reaction is carried out for 6 hours under the condition of vacuum degree ≤ -0.095MPa to obtain Thiol modified polyurethane adhesive prepolymer.

[0043] After testing, the mercapto group content of the mercaptan-modified polyurethane adhesive prepolymer provided in Example 2 of the present invention is 23.5%, the NCO content is 0.3%, and the viscosity is 10530 mpa*s.

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Abstract

The invention provides a thiol-modified polyurethane adhesive prepolymer. The thiol-modified polyurethane adhesive prepolymer is prepared from a thiol compound, isocyanate and an organic tin initiator; and the thiol compound contains two or more -SH groups, and the isocyanate contains two or more -NCO groups. Components with different proportions and contents are adopted to prepare the polyurethane adhesive prepolymer with different sulfydryl contents and viscosities according to actual application requirements.

Description

Technical field [0001] The invention relates to the technical field of polyurethane adhesives, in particular to a mercaptan-modified polyurethane adhesive prepolymer and a preparation method thereof. Background technique [0002] In organic chemistry, mercaptans are a class of non-aromatic compounds containing sulfhydryl functional groups; structurally speaking, they can be regarded as the formation of oxygen in ordinary alcohols replaced by sulfur. [0003] Thiols are widely used in the field of adhesives, especially in the field of fast curing epoxy resin adhesives at room temperature, and have the advantages of fast curing speed and high bonding strength after curing. However, most mercaptans are small molecular substances, which make them have the problems of low viscosity and good fluidity, which greatly limits the application range of mercaptans in the field of adhesives. [0004] Polyurethane adhesives are adhesives containing urethane groups or isocyanate groups in the molec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/38C08G18/10C09J175/04
CPCC08G18/10C08G18/3876C09J175/04
Inventor 梁万根崔卫华张超费潇瑶宋吻吻
Owner SHANDONG EFIRM BIOCHEMISTRY & ENVIRONMENTAL PROTECTION CO LTD
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