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Sealant prime coat liquid and preparation method thereof

A technology of primer and sealant, applied in the field of sealant, can solve the problems of shrinkage of primer, self-performance decline, poor heat resistance of sealant, etc., to achieve good bonding performance and mechanical properties, moderate surface drying time , the effect of good heat resistance

Active Publication Date: 2021-09-03
长春市汇融密封材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the installation of more than 80% of automobile windshields is usually sealed with one-component moisture-curing polyurethane. One-component polyurethane sealants are widely used in the gaps between doors, windows and walls, and pipe joints. However, one-component sealants There will also be some problems in the actual operation process, such as high viscosity, paste at room temperature, poor fluidity, when bonding with the substrate, the surface of the substrate cannot be well wetted due to fluidity problems, which affects the overall Bonding effect; during the moisture curing process of one-component polyurethane, carbon dioxide gas will be generated, which will stay inside the sealant or at the bonding interface, forming pores or bubbles, resulting in a decrease in its own performance and seriously affecting the bonding strength. , complete interface damage occurs, which affects the safety of use; in addition, ordinary polyurethane sealant has poor heat resistance, and in a long-term high-temperature environment, problems at the bonding interface will shorten the service life of the sealant
[0003] At present, the most commonly used solution is to pre-coat the primer to improve the adhesion between the sealant and the substrate. However, the existing primer for the one-component moisture-curing polyurethane The compatibility of the primer is poor, the contradiction between the dry time of the primer liquid and the bonding strength is relatively large, and the shrinkage cavity of the primer liquid during the construction process and other problems

Method used

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  • Sealant prime coat liquid and preparation method thereof
  • Sealant prime coat liquid and preparation method thereof
  • Sealant prime coat liquid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A sealant primer, comprising the following raw materials in parts by weight: 10 parts of isocyanate, 1 part of silicone blocking agent, 10 parts of polyester polyol, 1 part of crosslinking agent, 1 part of chain extender, surfactant 0.5 parts, 50 parts of solvent;

[0029] The polyester polyol is a mixture of polycarbonate diol and polyether diol, and the mass ratio is polycarbonate diol and polyether diol=1:1;

[0030] The isocyanate is toluene diisocyanate, and the organosilicon blocking agent is tetramethyldisiloxane;

[0031] The crosslinking agent is a mixture of methyltriacetoxysilane, polytriallyl isocyanurate, isocyanatotrimethoxysilane and aminosilane, and the mass ratio is methyltriacetoxysilane: poly Triallyl isocyanurate: isocyanate trimethoxysilane: aminosilane = 2:1:1:2;

[0032] The chain extender is diethylaminoethanol;

[0033] The surfactant is a mixture of amino silicone oil and alcohol modified silicone oil, and the mass ratio is amino silicone oi...

Embodiment 2

[0040] A sealant primer, comprising the following raw materials in parts by weight: 20 parts of isocyanate, 5 parts of silicone end-capping agent, 20 parts of polyester polyol, 5 parts of crosslinking agent, 3 parts of chain extender, surfactant 2 parts, 80 parts of solvent;

[0041] The polyester polyol is a mixture of polycarbonate diol and polyether triol, and the mass ratio is polycarbonate diol and polyether triol=1:1.5;

[0042] The isocyanate is toluene diisocyanate, and the organosilicon blocking agent is tetramethyldisiloxane;

[0043] The crosslinking agent is a mixture of methyltriacetoxysilane, polytriallyl isocyanurate, isocyanatotrimethoxysilane and aminosilane, and the mass ratio is methyltriacetoxysilane: poly Triallyl isocyanurate: isocyanate trimethoxysilane: aminosilane = 2:1:1:2;

[0044] The chain extender is diethylaminoethanol, N, N-dihydroxyaniline;

[0045] The surfactant is a mixture of amino silicone oil and alcohol modified silicone oil, and the ...

Embodiment 3

[0052] A sealant primer, comprising the following raw materials in parts by weight: 15 parts of isocyanate, 3 parts of silicone end-capping agent, 15 parts of polyester polyol, 3 parts of crosslinking agent, 2 parts of chain extender, surfactant 1.2 parts, 65 parts of solvent;

[0053] The polyester polyol is a mixture of polycarbonate diol and polyether diol, and the mass ratio is polycarbonate diol and polyether diol=1:1.2;

[0054] The isocyanate is toluene diisocyanate, and the organosilicon blocking agent is tetramethyldisiloxane;

[0055] The crosslinking agent is a mixture of methyltriacetoxysilane, polytriallyl isocyanurate, isocyanatotrimethoxysilane and aminosilane, and the mass ratio is methyltriacetoxysilane: poly Triallyl isocyanurate: isocyanate trimethoxysilane: aminosilane = 2:1:1:2;

[0056] The chain extender is diethylaminoethanol, N, N-dihydroxyaniline, trimethylolpropane;

[0057] The surfactant is a mixture of amino silicone oil and alcohol modified si...

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Abstract

The invention relates to the technical field of sealants, in particular to a sealant prime coat liquid and a preparation method thereof. The sealant prime coat liquid comprises the following raw materials in parts by weight: 10-20 parts of isocyanate, 1-5 parts of an organosilicon end-capping agent, 10-20 parts of polyester polyol, 1-5 parts of a cross-linking agent, 1-3 parts of a chain extender, 0.5-2 parts of a surfactant and 50-80 parts of a solvent. The prime coat liquid prepared by the invention is good in compatibility, moderate in surface drying time, high in bonding strength, beneficial to adhesion of a base material and a sealant, convenient to construct and good in construction effect.

Description

technical field [0001] The invention relates to the technical field of sealant, in particular to a sealant primer and a preparation method thereof. Background technique [0002] Due to its excellent mechanical properties and good adhesion, polyurethane sealant has been widely used in building waterproofing and automotive sealing. At present, the installation of more than 80% of automobile windshields is usually sealed with one-component moisture-curing polyurethane. One-component polyurethane sealants are widely used in the gaps between doors, windows and walls, and pipe joints. However, one-component sealants There will also be some problems in the actual operation process, such as high viscosity, paste at room temperature, poor fluidity, when bonding with the substrate, the surface of the substrate cannot be well wetted due to fluidity problems, which affects the overall Bonding effect; during the moisture curing process of one-component polyurethane, carbon dioxide gas w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04C08G18/66C08G18/48C08G18/44C08G18/32
CPCC09D175/04C08G18/6622C08G18/4018C08G18/44C08G18/48Y02P20/129
Inventor 邹微丽
Owner 长春市汇融密封材料有限公司
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