A kind of heat-resistant one-component polyurethane sealant and preparation method thereof

A polyurethane sealant, a single-component technology, applied in the field of sealants, can solve the problems of limiting the scope of use of single-component polyurethane sealants, the main chain is prone to breakage, degradation, and performance cannot be maintained for a long time, and achieves excellent heat resistance. , Improve hardness and good adhesion

Active Publication Date: 2021-06-01
SHANDONG NORTH MODERN CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] One-component polyurethane sealant is widely used in the field of vehicle production, assembly and maintenance because of its good physical and mechanical properties, weather resistance, wear resistance and oil resistance. At present, more than 95% of automobile windshields at home and abroad are assembled using single One-component polyurethane adhesive sealant; however, ordinary one-component polyurethane sealant has poor heat resistance due to some groups in the main chain such as biuret and urethane groups, and its performance cannot be maintained for a long time in a high-temperature environment. When in use, the temperature should not exceed 120°C, and it will start to decompose when it is above 144°C, and the main chain is prone to breakage and degradation. Rapid degradation or even overall carbonization will occur at 150°C, which limits the scope of use of one-component polyurethane sealants

Method used

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  • A kind of heat-resistant one-component polyurethane sealant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] A heat-resistant single-component polyurethane sealant, consisting of the following raw materials: 20kg polyether polyol, 5kg polyester polyol, 5kg isocyanate, 14kg first plasticizer, 0.2kg water remover, 15kg filler, epoxy base Modified prepolymer 5kg, stabilizer 0.05kg, auxiliary agent 3kg and first catalyst 0.01kg;

[0051] The polyether polyol is a trifunctional polyoxypropylene ether with a molecular weight of 3000-6000;

[0052] The polyester polyol is a difunctional polycaprolactone polyol with a molecular weight of 1000-3000;

[0053] Described isocyanate is diphenylmethane diisocyanate;

[0054] The first plasticizer is epoxy soybean oil;

[0055] The water removal agent is p-toluenesulfonyl isocyanate;

[0056] The filler is obtained by mixing carbon black and light calcium carbonate according to a mass ratio of 2:1;

[0057] The stabilizer is 2-(2'-hydroxy-3',5'-dipentylphenyl)benzotriazole;

[0058] The auxiliary agent is obtained by mixing calcium oxid...

Embodiment 2

[0062] A heat-resistant single-component polyurethane sealant, consisting of the following raw materials: 40kg polyether polyol, 15kg polyester polyol, 14kg isocyanate, 28kg first plasticizer, 1kg water remover, 30kg filler, epoxy modified 15kg of permanent prepolymer, 0.7kg of stabilizer, 10kg of auxiliary agent and 0.4kg of the first catalyst;

[0063] The polyether polyol is a trifunctional polyoxyethylene ether with a molecular weight of 3000-6000;

[0064] The polyester polyol is a difunctional polycarbonate polyol with a molecular weight of 1000-3000;

[0065] The isocyanate is obtained by mixing diphenylmethane diisocyanate and toluene diisocyanate according to a mass ratio of 5:1;

[0066] The first plasticizer is phenyl alkylsulfonate;

[0067] The water removal agent is p-toluenesulfonyl isocyanate;

[0068] The filler is obtained by mixing carbon black and silicon micropowder according to a mass ratio of 1:1;

[0069] The stabilizer is 2-[2,4-bis(2,4-xylyl)-2-(1...

Embodiment 3

[0074] A heat-resistant single-component polyurethane sealant, consisting of the following raw materials: 25kg polyether polyol, 8kg polyester polyol, 8kg isocyanate, 15kg first plasticizer, 0.4kg water remover, 18kg filler, epoxy base Modified prepolymer 8kg, stabilizer 0.2kg, auxiliary agent 5kg and first catalyst 0.1kg;

[0075] The polyether polyol is a trifunctional polyoxypropylene ether with a molecular weight of 3000-6000;

[0076] The polyester polyol is a difunctional polycaprolactone polyol with a molecular weight of 1000-3000;

[0077] The isocyanate is obtained by mixing diphenylmethane diisocyanate and isophorone diisocyanate in a weight ratio of 3:1;

[0078] The first plasticizer is obtained by mixing diisodecyl phthalate and phenyl alkylsulfonate in a weight ratio of 1:4;

[0079] The water removal agent is p-toluenesulfonyl isocyanate;

[0080] The filler is obtained by mixing carbon black and talcum powder in a weight ratio of 1:1;

[0081] The stabilize...

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Abstract

The invention discloses a heat-resistant single-component polyurethane sealant and a preparation method thereof, which consists of the following raw materials: polyether polyol, polyester polyol, isocyanate, plasticizer, water remover, filler, epoxy modified non-toxic prepolymer, stabilizer, auxiliary agent and catalyst; the heat-resistant one-component polyurethane sealant of the present invention has excellent heat resistance, can be cured rapidly at 180-190°C, and will not soften or crack for 1 hour , cured at 195°C for 30 minutes and then placed for 1 hour, the tensile strength can reach more than 13MPa, the shear strength can reach more than 7MPa, the tear strength can reach more than 15N / mm, and the hardness is more than 60; One-component polyurethane sealant has good adhesion to metal and other substrates, and can be used for structural bonding of various metal substrates.

Description

technical field [0001] The invention relates to the technical field of sealants, in particular to a heat-resistant single-component polyurethane sealant and a preparation method thereof. Background technique [0002] One-component polyurethane sealant is widely used in the field of vehicle production, assembly and maintenance because of its good physical and mechanical properties, weather resistance, wear resistance and oil resistance. At present, more than 95% of automobile windshields at home and abroad are assembled using single One-component polyurethane adhesive sealant; however, ordinary one-component polyurethane sealant has poor heat resistance due to some groups in the main chain such as biuret and urethane groups, and its performance cannot be maintained for a long time in a high-temperature environment. When in use, the temperature should not exceed 120°C, and it will start to decompose when it is above 144°C, and the main chain is prone to breakage and degradatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/04
CPCC08L2201/08C08L2205/025C09J175/04C08L75/04
Inventor 杜厚俊蔡玉海王力于伟强刘杨华董斌张健伟王玉东
Owner SHANDONG NORTH MODERN CHEM IND
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