Bis-secondary amine containing siloxane groups and preparation method and application of bis-secondary amine

A technology of siloxane group and bis-secondary amine is applied in the preparation of moisture-cured spray polyurea elastomer and its preparation field, which can solve the problem of poor adhesion, fast reaction speed of A/B mixed components, polyurea material Problems such as poor toughness

Active Publication Date: 2020-02-07
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the method of introducing silicone into polyurea is mainly to physically mix it with other diamines in component B and then spray it. The reaction speed of the A / B mixed component sprayed out by this method is too fast, and it is difficult to effectively infiltrate the substrate. The interior of the polyurea material has poor adhesion, and the cross-linking points in this system are urea groups, resulting in poor toughness of the polyurea material in the later stage

Method used

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  • Bis-secondary amine containing siloxane groups and preparation method and application of bis-secondary amine
  • Bis-secondary amine containing siloxane groups and preparation method and application of bis-secondary amine
  • Bis-secondary amine containing siloxane groups and preparation method and application of bis-secondary amine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] A preparation method of moisture-cured spray polyurea elastomer, comprising:

[0077] Preparation of component A:

[0078] Add 40 parts of polyoxypropylene diol (N210, Mn=1000) into the reactor, dehydrate at 110°C for 3 hours under a vacuum of 0.09MPa, and then lower the temperature to 60°C. Add 48 parts of isophorone diisocyanate to a reaction kettle with a stirrer and nitrogen protection, and add 5 parts of dibutyl phthalate and 0.1 part of dibutyltin dilaurate, and then dehydrate The polyoxypropylene diol is slowly added dropwise into the reaction kettle. After the dropwise addition, the temperature of the reaction system is raised to 90°C, and the temperature is kept for 3 hours. After defoaming, the temperature is lowered to obtain the isocyanate prepolymer group A with the -NCO content of 15.9%. Minute;

[0079] Preparation of component B:

[0080] equipped with stirrer, thermometer and N 2 Add 30 parts of isophorone diamine and 0.39 parts of tetraalkylammoniu...

Embodiment 2

[0083] A preparation method of moisture-cured spray polyurea elastomer, comprising:

[0084] Preparation of component A:

[0085] Add 51.25 parts of polyoxypropylene diol (N204, Mn=400) into the reactor, dehydrate at 110°C for 3 hours under a vacuum of 0.09MPa, and then lower the temperature to 60°C. The hexamethylene diisocyanate of 59 parts is joined in the reactor with agitator and nitrogen protection, the dibutyl phthalate of 15 parts and the dibutyltin dilaurate of 0.66 parts are added, then the dehydrated Slowly add polyoxypropylene diol to the reaction kettle dropwise. After the dropwise addition, raise the temperature of the reaction system to 90°C, keep it warm for 3 hours, and cool down after defoaming to obtain the isocyanate prepolymer A component with a -NCO content of 15%. ;

[0086] Preparation of component B:

[0087] equipped with stirrer, thermometer and N 2 Add 46.75 parts of diaminodicyclohexylmethane and 1.12 parts of tetraalkylammonium hydroxide to th...

Embodiment 3

[0090] A preparation method of moisture-cured spray polyurea elastomer, comprising:

[0091] Preparation of component A:

[0092] Add 37.2 parts of polyoxypropylene diol (N210, Mn=1000) into the reactor, dehydrate at 110°C for 3 hours under a vacuum of 0.09MPa, and then lower the temperature to 60°C. 62.8 parts of dicyclohexylmethane diisocyanate are added to a reactor with a stirrer and nitrogen protection, 10 parts of dibutyl phthalate and 0.4 part of dibutyltin dilaurate are added, and then the dehydrated Slowly add polyoxypropylene diol into the reaction kettle dropwise. After the dropwise addition, raise the temperature of the reaction system to 90°C, keep it warm for 3 hours, and cool down after defoaming to obtain component A of isocyanate prepolymer with a -NCO content of 15.4%. ;

[0093] Preparation of component B:

[0094] equipped with stirrer, thermometer and N 2 Add 15 parts of 1,3-propylenediamine and 0.64 parts of tetraalkylammonium hydroxide to the reaction ...

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Abstract

The invention discloses bis-secondary amine containing siloxane groups and a preparation method and application of the bis-secondary amine. The bis-secondary amine containing the siloxane groups is obtained by Michael addition reaction of one or more bis-primary amines and siloxane containing unsaturated double bonds. A B component of spray polyurea is prepared by mixing the bis-secondary amine and an auxiliary agent, an isocyanate prepolymer generated by reaction of polyether polyol and isocyanate is taken as a component A, and the component A and the component B are mixed and sprayed according to the volume ratio of the components A and B of 1 : 1 to obtain a polyurea material. Two active hydrogens of the bis-secondary amine can react with the isocyanate to generate linear polyurea, andthe siloxane groups can be hydrolyzed to generate Si-O-Si cross-linking points, so that the cross-linking speed of the amine and the isocyanate is reduced and the mechanical properties of the polyureamaterial are improved.

Description

technical field [0001] The invention relates to the technical field of spray-coated polyurea elastomers, in particular to bis-secondary amines containing siloxane groups and a preparation method thereof, which is used as a raw material to prepare moisture-cured spray-coated polyurea elastomers and a preparation method thereof. Background technique [0002] Spray polyurea elastomer is a new multi-functional material widely used in waterproof and anti-corrosion fields. It has excellent waterproof performance, anti-corrosion performance and wear resistance. Traditional waterproof materials such as acrylic emulsion waterproof coatings are not resistant to aging, cannot be exposed, have low strength, poor puncture resistance, high requirements on the construction environment, slow curing, low construction efficiency, etc., and the raw material system does not contain solvents. According to the current environmental protection requirements, it can be continuously sprayed on the su...

Claims

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Application Information

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IPC IPC(8): C08G18/38C08G18/66C08G18/48C09D175/02C09D7/61C07F7/18
CPCC08G18/3893C08G18/6685C09D175/02C09D7/61C07F7/1892C08K3/36
Inventor 杜秀才刘赵兴任树杰陈杰方璞吴鹏超姜庆梅
Owner WANHUA CHEM GRP CO LTD
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