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Moisture-curable modified polysiloxane and preparation method and application thereof

A technology of polysiloxane and moisture curing, which is applied in the field of silicone adhesives, can solve problems such as viscosity peaks, and achieve good bonding performance, low cost, and mild curing conditions

Inactive Publication Date: 2021-01-12
肇庆市武大环境技术研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The third object of the present invention is to provide an application of modified polysiloxane, which can be used to prepare room temperature vulcanized silicone rubber, which can fundamentally solve the problem of traditional polysiloxane curing process. There is a problem of "viscosity peak", improve the storage stability of the product, and at the same time ensure the normal curing of the product, the prepared silicone rubber composition has excellent performance and good application value

Method used

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  • Moisture-curable modified polysiloxane and preparation method and application thereof
  • Moisture-curable modified polysiloxane and preparation method and application thereof
  • Moisture-curable modified polysiloxane and preparation method and application thereof

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Effect test

Embodiment 1

[0050] Add 100g of hydroxyhydrocarbyl polysiloxane of 1000cst (hydroxyl content 6.0mmol / 100g), 1.3g of isocyanatopropyltrimethoxysilane, and n-titanate 1 part of butyl ester was stirred and reacted under vacuum for 4 hours to obtain a trimethoxy-terminated polysiloxane product with a viscosity of 1200 cst.

[0051] The IR comparison chart of hydroxyhydrocarbyl polysiloxane and trimethoxy end-capped polysiloxane product is as follows figure 1 . In hydroxyhydrocarbyl polysiloxane, silyl group (Si-CH 3 ) stretching vibration peak appears at 2 964cm -1 and 2 906cm -1 ; its symmetrical deformation vibration peak appears at 1261cm -1 and 1411cm -1 Office; 2848cm -1 The absorption at is attributed to the methylene (CH 2 ) characteristic peak; 1020cm -1 with 1 099cm -1 The characteristic absorption at is the antisymmetric stretching vibration absorption of the silicon-oxygen (Si-O-Si) bond, and the characteristic peak of the hydroxyl group (OH) appears at 3 693 cm -1 place. ...

Embodiment 2

[0053] Add 5000cst (hydroxyl content 3.0mmol / 100g) of hydroxyhydrocarbyl polysiloxane 100g, isocyanatopropyltriethoxysilane 0.9g, titanic acid 1 part of n-butyl ester was stirred and reacted under vacuum for 4 hours to obtain a triethoxy-terminated polysiloxane product with a viscosity of 6000 cst.

Embodiment 3

[0055] Add 20000cst (hydroxyl content 1.0mmol / 100g) of hydroxyhydrocarbyl polysiloxane 100g, isocyanatopropyl diethoxysilane 0.2g, titanic acid 1 part of n-butyl ester was stirred and reacted under vacuum for 4 hours to obtain dimethoxy-terminated polysiloxane with a viscosity of 23000 cst.

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Abstract

The invention relates to moisture-curable modified polysiloxane and a preparation method and application thereof. The modified polysiloxane is obtained by carrying out addition reaction on double-terminal hydroxyl alkyl polysiloxane and isocyanato alkoxy silane. The modified polysiloxane has a single linear structure, has a siloxy end group, can be moisture-cured at room temperature, has stable viscosity before and after curing, and has the advantages of mild curing conditions, no curing depth limitation and deep curing. The modified polysiloxane is applied to preparation of room-temperature vulcanized silicone rubber, the problem of 'viscosity peak' existing in the traditional polysiloxane curing process can be fundamentally solved, the storage stability of the product is improved, meanwhile, normal curing of the product is guaranteed, and the prepared silicone rubber composition is excellent in performance and has good application value.

Description

technical field [0001] The invention relates to a modified polysiloxane, in particular to a moisture-curable modified polysiloxane and its preparation method and the application of alkoxypolysiloxane in silicone rubber compositions, belonging to organic Silicone adhesive field. Background technique [0002] One-component room temperature moisture vulcanized silicone rubber products are easy to apply, the vulcanization process is less affected by temperature, and have good adhesion. They have been widely used in the fields of construction, electronics, aerospace, auto parts and photovoltaic cells. RTV silicone rubber is generally composed of hydroxyl-terminated polysiloxane, alkoxysilane crosslinking agent, filler and organometallic catalyst. In the process of mixing and preparing, there will be a short-term cross-linking process, which will lead to a sharp increase in the viscosity of the system, and even the phenomenon of gel agglomeration, which is called "viscosity peak"...

Claims

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Application Information

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IPC IPC(8): C08G18/77C08G18/61C08L75/04C08K13/04C08K7/26C08K5/544C08K3/04C08K5/57C08K3/26C08K13/02
CPCC08G18/778C08G18/61C08K13/04C08K7/26C08K5/544C08K3/04C08K5/57C08K3/26C08K13/02C08K2003/265C08L75/04
Inventor 侯浩波纪建业叶非华张鹏举李银生江俊锋
Owner 肇庆市武大环境技术研究院
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