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Single-component polyurethane sealant suitable for metal bonding and preparation method thereof

A polyurethane sealant, a single-component technology, applied in the field of sealants, can solve the problems of poor thermal stability, poor metal bonding performance, bubbles and cracks of single-component sealants, and achieve storage stability, aging resistance, flow good sex effect

Inactive Publication Date: 2020-01-31
SHANGHAI DIMU NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the thermal stability of single-component sealants is poor. Conventional products can only withstand a short-term high temperature of 120°C. Bubbles and cracks may occur in high-temperature thermal environments. They are not resistant to aging and have poor adhesion to metals, which cannot meet the requirements. , thus limiting its further application

Method used

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  • Single-component polyurethane sealant suitable for metal bonding and preparation method thereof

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preparation example Construction

[0039] In one embodiment, the silane coupling agent includes silane coupling agent D, and the preparation method of the silane coupling agent D includes: adding γ-glycidyl propyl methyl dimethoxy in a four-necked flask base silane, toluene, chloroplatinic acid-isopropanol, open the condensing device and the stirring device, blow nitrogen, heat to 75-85 ℃, add dimethylaminopropyl acrylamide and eugenol glycidyl ether dropwise, within 2-3 hours Addition is complete, heated to 110 ~ 130 ° C, react for 1h, that is.

[0040] Preferably, the weight ratio of the total weight of the γ-glycidylpropylmethyldimethoxysilane and dimethylaminopropylacrylamide to toluene is 1: (1-2); more preferably, the The weight ratio of the total weight of γ-glycidylpropylmethyldimethoxysilane and dimethylaminopropylacrylamide to toluene is 1:1.5.

[0041] Preferably, the molar ratio of the γ-glycidylpropylmethyldimethoxysilane to dimethylaminopropylacrylamide is (1-1.5):1; more preferably, the γ-glycid...

Embodiment 1

[0085] Embodiment 1 of the present invention provides a one-component polyurethane sealant for bonding metals. In parts by weight, its preparation raw materials include 35 parts of polyurethane prepolymer, 5 parts of plasticizer, 0.5 part of water absorbing agent, 1 Part adhesion promoter, 0.01 part catalyst, 20 parts calcium carbonate, 2 parts carbon black, 0.5 part fumed silica.

[0086] The polyurethane prepolymer is purchased from Wuhan Shiquanxing New Material Technology Co., Ltd., the model is SG-AC50; the plasticizer is dioctyl phthalate; the water absorbing agent is p-toluenesulfonyl Isocyanate; The catalyst is di-n-butyltin dilaurate; The nano-calcium carbonate is purchased from Shandong Hongxiang Zinc Industry Co., Ltd.; The rubber carbon black is purchased from Guangzhou Xianrenhui International Trade Co., Ltd., and the model is N330; Fumed silica was purchased from Shanghai Mo High-tech Material Technology Co., Ltd., with a particle size of 30 nm.

[0087] The raw...

Embodiment 2

[0100] Embodiment 2 of the present invention provides a one-component polyurethane sealant for bonding metals. In parts by weight, its preparation raw materials include 50 parts of polyurethane prepolymer, 40 parts of plasticizer, 6 parts of water absorbing agent, 1.5 parts of 1 part adhesion promoter, 1 part catalyst, 40 parts calcium carbonate, 10 parts carbon black, 5 parts fumed silica.

[0101] The polyurethane prepolymer is purchased from Wuhan Shiquanxing New Material Technology Co., Ltd., the model is SG-AC50; the plasticizer is dioctyl phthalate; the water absorbing agent is p-toluenesulfonyl Isocyanate; The catalyst is di-n-butyltin dilaurate; The nano-calcium carbonate is purchased from Shandong Hongxiang Zinc Industry Co., Ltd.; The rubber carbon black is purchased from Guangzhou Xianrenhui International Trade Co., Ltd., and the model is N330; Fumed silica was purchased from Shanghai Mo High-tech Material Technology Co., Ltd., with a particle size of 30 nm.

[010...

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Abstract

The invention relates to the field of sealants, in particular to a single-component polyurethane sealant suitable for metal bonding and a preparation method. The single-component polyurethane sealantis prepared from the following raw materials in parts by weight: 35-50 parts of a polyurethane prepolymer, 5-40 parts of a plasticizer, 0.5-6 parts of a water absorbent, 1-1.5 parts of an adhesion promoter and 0.01-1 part of a catalyst. According to the invention, isophorone diisocyanate and hexamethylene diisocyanate are used as an isocyanate; diethylenetriamine propyl trimethoxy silane, 3-anilino propyl trimethoxy silane and a silane coupling agent D are taken as a silane coupling agent to prepare a bonding accelerate for using in the single-component polyurethane sealant; the single-component polyurethane sealant has good fluidity, can avoid formation of a water vapor weak boundary layer, can maintain certain tensile strength, can resist aging, high temperature and low temperature, canbear an extreme application environment, and is stable in storage and wide in application range.

Description

technical field [0001] The invention relates to the field of sealant, more specifically, the invention relates to a one-component polyurethane sealant suitable for metal bonding and a preparation method. Background technique [0002] Sealant is a material used to fill the configuration gap to achieve sealing effect. It can deform with the shape of the sealing surface and is not easy to flow. [0003] At present, polyurethane sealants are mainly divided into two types: one-component and two-component. One-component is moisture-curing type, and two-component is reaction-curing type. Two-component has the characteristics of fast curing and good performance, but it needs to be prepared when used, and the process is complicated. One-component sealant has the characteristics of convenient construction, no need to mix, and easy extrusion, and is suitable for automatic assembly line operations. Therefore, the development and utilization of one-component sealant has attracted much a...

Claims

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Application Information

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IPC IPC(8): C09J175/04C09J11/08C08G18/32C08G18/28C08G18/75C08G18/73
CPCC08G18/289C08G18/3893C08G18/73C08G18/751C08L2201/08C08L2205/025C09J11/08C09J175/04C08L75/04
Inventor 田方军刘斌
Owner SHANGHAI DIMU NEW MATERIAL TECH