Fluorosilicon modified polyether polymer and preparation method thereof

A polyether polymer, fluorosilicone modified technology, applied in polyurea/polyurethane adhesives, polyurea/polyurethane coatings, adhesive types, etc., can solve problems such as insufficient heat resistance and UV resistance, and achieve construction Convenience, good preparation reproducibility, and less environmental pollution

Inactive Publication Date: 2019-03-29
SHANGHAI DONGDA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This application overcomes the problem of insufficient heat resistance and UV resistance of silane-modified polyether polymers containing urethane bonds in the prior art, and provides a fluorosilicon-modified polyether polymer and its preparation method

Method used

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  • Fluorosilicon modified polyether polymer and preparation method thereof

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preparation example Construction

[0037] In a specific embodiment, the present invention provides a method for preparing a fluorosilicon-modified polyether polymer, comprising the steps of:

[0038] (1) Dehydrate and degas the polyether polyol under vacuum conditions at 90-130°C for 1-4 hours, then lower the temperature to 50-80°C, add diisocyanate and catalyst to the polyether polyol to control the isocyanate of the diisocyanate The molar ratio of cyanate groups to hydroxyl groups of polyether polyols is 1.1-2:1; high-purity nitrogen gas is introduced, stirred evenly, and then reacted at 50-90°C for 1-6 hours to obtain isocyanate-terminated polyether prepolymers.

[0039] (2) Mix the isocyanate-terminated polyether prepolymer with the fluorine-containing secondary aminosilane coupling agent according to the molar ratio of the amino group to the isocyanate group of 0.9-1.2:1. Under protection, react for 1-6 hours until the system is titrated without the presence of isocyanate to end the reaction, and then remo...

Embodiment 1

[0055] (1) Add 100 parts of γ-aminopropyltrimethoxysilane to a four-necked flask equipped with a stirrer, a constant pressure dropping funnel and an air duct, feed in nitrogen and start stirring, and add an equimolar amount of A certain amount of trifluoroethyl acrylate was added dropwise within 30 minutes, then the temperature was raised to 90°C, and the reaction was carried out for 4 hours to obtain a fluorine-containing secondary aminosilane coupling agent.

[0056] (2) Dehydrate and degas 100 parts of polyether polyol (C2160, Shanghai Dongda Chemical Co., Ltd.) with a number average molecular weight of 16000 under vacuum conditions at 110°C for 2 hours, then cool down to 60°C, and add TDI (diisocyanate) in sequence The molar ratio of isocyanate to the hydroxyl group of polyether polyol is 2:1), dibutyltin dilaurate (accounting for 0.1% of the mass of polyether polyol), feed high-purity nitrogen as reaction protection gas, stir evenly, and React at 90°C for 1 hour to obtain...

Embodiment 2

[0059] (1) Add 100 parts of γ-aminopropyltriethoxysilane into a four-necked flask equipped with a stirrer, a constant pressure dropping funnel and an air duct, feed nitrogen gas and start stirring, dropwise at 40°C, etc. The molar amount of tetrafluoropropyl acrylate was added dropwise within 30 minutes, then the temperature was raised to 90°C, and the reaction was carried out for 4 hours to obtain the fluorine-containing secondary aminosilane coupling agent;

[0060] (2) Dehydrate and degas 100 parts of polyether polyol (C2060, Shanghai Dongda Chemical Co., Ltd.) with a number average molecular weight of 6000 under vacuum conditions at 110°C for 2 hours, then cool down to 60°C, and add TDI (diisocyanate) in sequence The molar ratio of isocyanate to the hydroxyl group of polyether polyol is 1.3:1), dibutyltin dilaurate (accounting for 0.1% of the mass of polyether polyol), feed high-purity nitrogen as reaction protective gas, stir evenly, in React at 50°C for 6 hours to obtain...

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Abstract

The invention relates to a preparation method of a fluorosilicon modified polyether polymer. The method includes: (1) subjecting polyether polyol to dehydration and degassing under a 90-130DEG C vacuum condition for 1-4h, then performing cooling to 50-80DEG C, adding diisocyanate and a catalyst into polyether polyol; introducing inert gas, stirring the substances evenly, and carrying out reactionat 50-90DEG C for 1-6h, thus obtaining an isocyanate group-terminated polyether prepolymer; and (2) mixing the isocyanate group-terminated polyether prepolymer with a fluorine-containing secondary amino silane coupling agent, and carrying out reaction at 30-90DEG C under inert gas protection for 1-6h till no existence of isocyanato in the system through titration, and ending the reaction, thus obtaining the fluorosilicon modified polyether polymer. The invention also relates to the fluorosilicon modified polyether polymer and the fluorine-containing secondary amino silane coupling agent. The process of termination and modification on the isocyanate group polyether prepolymer with the secondary amino silane coupling agent is easily controllable, no gelation phenomenon occurs, and the product has good preparation reproducibility.

Description

technical field [0001] The present application relates to the technical field of sealants, in particular to a fluorosilicon-modified polyether polymer and a preparation method thereof. Background technique [0002] Silane modified sealant is a new type of sealant, which combines the advantages of silicone sealant and polyacid sealant, excellent bonding performance, wide adaptability to substrates, no organic solvents, free -NCO groups, The product is fast drying, fully cured, and there is no harmful gas emission during the curing process, low VOC, environmentally friendly, the surface can be painted, and there is no pollution to the substrate. In recent years, silane-modified polyether polymers can be widely used in various sectors of the national economy as base polymers for silane-modified sealants, adhesives or coatings. [0003] Silane-modified polyether polymers are based on polyether main chains, and some silane-modified polyether polymers contain a small amount of ur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/38C08G18/10C08G18/48C08G18/73C08G18/75C08G18/76C09J175/08C09D175/08
CPCC08G18/10C08G18/3893C08G18/4825C08G18/4829C08G18/73C08G18/755C08G18/7614C08G18/7671C09D175/08C09J175/08C08G18/38
Inventor 何志强王振波安鹏云梅生富
Owner SHANGHAI DONGDA CHEM
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