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Bottom sizing agent for polyurethane sealant and preparation method of bottom sizing agent

A polyurethane sealant and primer technology, used in polyurea/polyurethane coatings, coatings, etc., can solve the problems of restricted product market expansion, slow research and development progress, etc., and achieve long open time, short surface drying time, and durability. Good moist heat performance

Active Publication Date: 2017-05-31
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 sealants cured by room temperature moisture are widely used in automobile manufacturing, construction and other industries. Polyurethane sealants have good adaptability to various substrates, but the current one-component polyurethane sealants are suitable for porous surfaces. For non-porous surfaces such as glass and metal, it needs to be used in conjunction with a primer, because it is difficult to form a good coating on glass and some metal substrates in a short period of time when it is used for bonding windshield glass and other structures. Therefore, it is necessary to apply a primer to the surface of the difficult-to-stick substrate in advance. After the primer is dry, apply the polyurethane sealant to the surface of the primer and compact it to ensure that the polyurethane sealant has no effect on the part. Good adhesion to substrates
[0003] At present, although the polyurethane sealant products of many manufacturers in the market can be applied in some domestic brands of automobiles, there is no primer product suitable for various polyurethane sealants on the market, and the research and development progress is relatively slow, resulting in the expansion of the product market being constrained by For foreign companies, research on primers suitable for a variety of polyurethane sealants, and the use of primers with good performance in the automotive industry, electronics and construction industries need to be developed urgently

Method used

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  • Bottom sizing agent for polyurethane sealant and preparation method of bottom sizing agent
  • Bottom sizing agent for polyurethane sealant and preparation method of bottom sizing agent

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preparation example Construction

[0078] The present invention also includes the preparation method of polyurethane sealant primer, comprising the following steps:

[0079] ①Put the polyester polyol at 100~120°C, pressure ≥0.092MPa, remove water for 1~2 hours, cool down to 60~70°C, add diisocyanate 1 to it, and react at 80~85°C for 2~3 hours , lower the temperature to 45-55°C, then add a silane-capping agent to it, react for 0.5-1 hour, then cool down to 20-30°C to obtain a silane-terminated polyurethane polymer;

[0080] Among them, the mass ratio of polyester polyol, diisocyanate 1, and silane blocking agent is 10~20:2~5:1~4;

[0081] The diisocyanate 1 is 4,4'-diphenylmethane diisocyanate, toluene diisocyanate, isophorone diisocyanate, hexamethylene diisocyanate, xylylene diisocyanate or liquefied MDI;

[0082] The silane capping agent is 3-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, γ-mercaptopropyltrimethoxysilane, anilinomethyltrimethoxysilane or γ-aminoethyl Aminopropyltrimethoxysilane;...

Embodiment 1

[0108] A polyurethane sealant primer, consisting of the following raw materials: 20 kg of silane-terminated polyurethane polymer, 20 kg of modified polyurethane, 1 kg of p-toluenesulfonyl isocyanate, 2 kg of carbon black, and anti-settling agent Organic bentonite 1kg, adhesion promoter N-75 2kg, solvent ethyl acetate 30kg and catalyst bismorpholino diethyl ether 0.05kg.

[0109] Its preparation method comprises the following steps:

[0110] ① Remove water from 30kg of polyester polyol at 100°C and pressure ≥ 0.092MPa for 1 hour, cool down to 60°C, add 6kg of 4,4`-diphenylmethane diisocyanate to it, and react at 80°C for 2 hours , lower the temperature to 45°C, then add 12kg of 3-aminopropyltrimethoxysilane to it, react for 0.5 hours, then lower the temperature to 20°C to obtain a silane-terminated polyurethane polymer;

[0111] ② Remove water from 30kg of acrylate polyol at 100°C and pressure ≥ 0.092MPa for 1 hour, cool down to 60°C, add 15kg of toluene diisocyanate into it, ...

Embodiment 2

[0114] A polyurethane sealant primer, consisting of the following raw materials: 30kg of silane-terminated polyurethane polymer, 30kg of modified polyurethane, 2kg of water-removing agent vinyltrimethoxysilane, 10kg of carbon black, and gas-phase anti-settling agent Silica 2kg, adhesion promoter TDI trimer 5kg, solvent butyl acetate 65kg and catalyst triethylamine 0.2kg;

[0115] Its preparation method comprises the following steps:

[0116] ① Put 40kg of polyester polyol at 120°C, pressure ≥ 0.092MPa, remove water for 2 hours, cool down to 70°C, add 10kg of isophorone diisocyanate to it, react at 85°C for 3 hours, cool down to 55°C , and then adding 2kg of γ-aminopropyltriethoxysilane to it, reacting for 1 hour, and cooling to 30°C to obtain a silane-terminated polyurethane polymer;

[0117] ② Remove water from 40kg of acrylate polyol at 120°C and pressure ≥0.092MPa for 2 hours, cool down to 70°C, add 6kg of hexamethylene diisocyanate to it, react at 85°C for 3 hours, and co...

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Abstract

The invention discloses a bottom sizing agent for a polyurethane sealant. The bottom sizing agent is prepared from the following raw materials in parts by weight: 20 to 30 parts of silane-terminated polyurethane polymer, 20 to 30 parts of modified polyurethane, 1 to 2 parts of a water remover, 2 to 10 parts of carbon black, 1 to 2 parts of an anti-settling agent, 2 to 5 parts of an adhesion promoter, 30 to 65 parts of a solvent and 0.05 to 0.2 part of a catalyst. The bottom sizing agent for the polyurethane sealant, disclosed by the invention, has good mobility, can quickly form films on the surfaces of substrates such as glass, ceramic and metal, and has extremely-strong bonding performance for the substrates and a polyurethane sealant; an isocyanate modified acrylate prepolymer has good film forming property, facilitates quick surface dryness of the bottom sizing agent, has good adhesivity for the substrates and promotes bonding of the bottom sizing agent and the substrates. The bottom sizing agent disclosed by the invention has the advantages of high adaptability to the substrates, good bonding properties for multiple substrates such as glass fiber reinforced plastics, ceramic and glass, good water-resisting, heat-resisting and damp heat resisting properties, short surface drying time, long open time and longer time for allowing sizing after base coating construction.

Description

technical field [0001] The invention relates to the technical field of sealant primer, in particular to a polyurethane sealant primer and a preparation method thereof. Background technique [0002] One-component polyurethane sealants cured by room temperature moisture are widely used in automobile manufacturing, construction and other industries. Polyurethane sealants have good adaptability to various substrates, but the current one-component polyurethane sealants are suitable for porous surfaces. For non-porous surfaces such as glass and metal, it needs to be used in conjunction with a primer, because it is difficult to form a good coating on glass and some metal substrates in a short period of time when it is used for bonding windshield glass and other structures. Therefore, it is necessary to apply a primer to the surface of the difficult-to-stick substrate in advance. After the primer is dry, apply the polyurethane sealant to the surface of the primer and compact it to e...

Claims

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Application Information

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IPC IPC(8): C09D175/06C09D175/14C09D7/12C08G18/42C08G18/38C08G18/67
CPCC08G18/3893C08G18/42C08G18/675C08L2201/08C08L2205/02C08L2205/03C09D7/61C09D7/62C09D7/63C09D175/06C09D175/14C08L75/14C08K13/02C08K3/36C08K3/04C08L75/06
Inventor 杜厚俊张健伟于春英王力董斌孙志权
Owner SHANDONG NORTH MODERN CHEM IND
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