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Low-modulus high-elongation high-adhesive-strength organosilicon sealing material and its preparing method

A high elongation, sealing material technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of low bonding strength of substrates, low modulus, high elongation, and reduced adhesion. Long curing time, high elongation, good high and low temperature resistance

Active Publication Date: 2008-03-26
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This also has the disadvantages described in U.S.P.4410677: the plasticizer does not participate in the vulcanization crosslinking reaction, and is easy to migrate to the surface of the sealing material, reducing the adhesion, causing the seal to fail, and causing environmental pollution
[0009] Zhongguan has reported patents. Although silicone sealing materials with low modulus and high elongation have been produced, they all have shortcomings, and their bonding strength to the substrate is not high, so their applications are limited.
However, ketoxime silane is used as a chain extender to realize low modulus and high elongation, and silane coupling agents containing cyano and secondary amino groups are used as tackifiers to improve mechanical properties and bond strength to substrates. See the report

Method used

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  • Low-modulus high-elongation high-adhesive-strength organosilicon sealing material and its preparing method
  • Low-modulus high-elongation high-adhesive-strength organosilicon sealing material and its preparing method
  • Low-modulus high-elongation high-adhesive-strength organosilicon sealing material and its preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 100 parts of hydroxyl-terminated polydimethylsiloxane (25° C., 53000 cP), 100 parts of dried superfine activated calcium carbonate with a particle size range of 0.04-20 μm treated with stearic acid were placed in a vacuum-tight condition Mix in a planetary mixer for 2-3 hours to obtain the base rubber; then add 8 parts of dimethyl dibutylketoxime silane chain extender and 5 parts of methyl tributyl ketoxime silane crosslinking agent, under vacuum airtight condition Mix for 8-10 minutes; finally add 0.1 part of dibutyltin dilaurate catalyst and 1 part of 7A silane coupling agent, mix for 8-10 minutes, vacuum remove air bubbles and some low molecular substances generated during the reaction, and then seal and store .

[0036] The other three groups of silicone sealing materials were prepared in the same way, except that 6 parts, 3 parts and 0 parts of dimethyldibutylketoximosilane chain extender were added respectively. Inject the prepared silicone sealing material into ...

Embodiment 2

[0041] 100 parts of hydroxyl-terminated polydimethylsiloxane (25° C., 53000 cP), 100 parts of dried superfine activated calcium carbonate with a particle size range of 0.04-20 μm treated with stearic acid were placed in a vacuum-tight condition Mix in a planetary mixer for 2-3 hours to obtain the base rubber; then add 8 parts of methyl vinyl dibutylketoxime silane chain extender and 4 parts of methyl tributylketoxime silane cross-linking agent, vacuum airtight condition Mix at low temperature for 8-10 minutes; finally add 0.1 part of dibutyltin dilaurate catalyst and 1 part of 7A silane coupling agent, mix for 8-10 minutes, remove air bubbles and some low molecular substances generated in the reaction by vacuum, seal save.

[0042] The other three groups of silicone sealing materials were prepared in the same way, except that 6 parts, 2 parts and 0 parts of methylvinyl dibutylketoxime silane chain extender were added respectively. Inject the prepared silicone sealing material...

Embodiment 3

[0047] 100 parts of hydroxyl-terminated polydimethylsiloxane (25° C., 53000 cP), 100 parts of dried superfine activated calcium carbonate with a particle size range of 0.04-20 μm treated with stearic acid were placed in a vacuum-tight condition Mix in a planetary mixer for 2-3 hours to obtain the base compound. Then add 6 parts of dimethyl dibutylketoxime silane chain extender and 5 parts of methyl tributyl ketoxime silane crosslinking agent, and mix for 8-10 minutes under vacuum airtight condition; finally add 0.1 part of dibutyl dilaurel Acid tin catalyst and 1 part of 7A silane coupling agent, mix for 8-10 minutes, vacuum remove air bubbles and some low molecular substances generated in the reaction, and then seal and store.

[0048] The other four groups of silicone sealing materials were prepared in the same way, except for the type of silane coupling agent. One part of KH-792, 6A, DL-602 or no silane coupling agent is added respectively. Inject the prepared silicone se...

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Abstract

The invention discloses a method to make low modulus high extensibility high strength of bond organic silicon sealed material. The components are poly-organic radical siloxane 100 portions, filling material 50-200 portions, extending agent 1-10 portions, cross linking fixation agent 2-10 portions, activator 0.05-2 portions and silane coupling agent 0.1-5 portions. The sealing material has excellent weathering aging endurance and temperature endurance, good cementing and good water endurance.

Description

technical field [0001] The invention relates to a silicone sealing material with low modulus, high elongation and high bonding strength and a preparation method thereof. The invention specifically relates to a room temperature vulcanization (RTV) silicone sealing material with low modulus, high elongation, good sealing and bonding performance, high storage stability, strong elastic expansion and contraction ability, and excellent weather resistance and a preparation method thereof. Background technique [0002] With the rapid development of construction and transportation in my country, large-scale construction facilities, highways and tunnel projects are increasing day by day. The problem of concrete expansion joints has attracted great attention from the engineering community. It is required to further improve the aging resistance, water resistance and elasticity of concrete expansion joint materials. performance, overall adhesion and strength. At present, the concrete joi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/14C09K3/10C08K5/54
Inventor 郑强徐晓明林薇薇高传花郑苏秦陶小乐
Owner ZHEJIANG UNIV
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