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Hydroxyl scavenging agent, preparation method thereof and vulcanized silicone rubber containing hydroxyl scavenging agent

A technology of hydroxyl scavenger and alkyl group, which is applied in the field of new hydroxyl scavenger, can solve the problems of widespread influence, slow curing speed of dealcoholized room temperature vulcanized silicone rubber, and poor versatility, and achieve the effect of accelerating deep curing speed

Active Publication Date: 2014-04-23
GUANGZHOU HUITIAN FINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A kind of method is to adopt titanate chelate as catalyst, and this catalyst can improve the storage stability of dealcoholization type room temperature vulcanization silicone rubber to a certain extent, but in storage process and after vulcanization, dealcoholization type room temperature vulcanization silicone rubber It is easy to turn yellow, which affects its wide use
Another method is to use alkoxy-terminated polydimethylsiloxane as the base polymer to prepare dealcoholized room temperature vulcanized silicone rubber, but the disadvantage of this polymer is that its end group is reactive. During storage, the cross-linking reaction will slowly occur when encountering moisture; in addition, the reactivity of this polymer is relatively mild, and the curing speed of the dealcoholized room temperature vulcanized silicone rubber prepared by this method is generally slow
Another method is to add a hydroxyl scavenger to effectively prevent the generation of free alcohol in dealcoholized room temperature vulcanized silicone rubber. The most commonly used hydroxyl scavenger is hexamethyldisilazane. The stability improvement effect of alcohol type room temperature vulcanization silicone rubber is greatly affected by the thickening accelerator, which is not very versatile, and will damage the deep curing performance of dealcohol type room temperature vulcanization silicone rubber

Method used

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  • Hydroxyl scavenging agent, preparation method thereof and vulcanized silicone rubber containing hydroxyl scavenging agent
  • Hydroxyl scavenging agent, preparation method thereof and vulcanized silicone rubber containing hydroxyl scavenging agent
  • Hydroxyl scavenging agent, preparation method thereof and vulcanized silicone rubber containing hydroxyl scavenging agent

Examples

Experimental program
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Effect test

Embodiment 1

[0116] 100 parts by weight of hydroxy-terminated polydimethylsiloxane with a dynamic viscosity of 5000mPa·s (degree of polymerization: about 600), 6 parts by weight of specific surface area of ​​150m 2 / g of hydrophobic fumed silica (average particle size 12nm), 10 parts by weight of polydimethyl silicone oil with a viscosity of 100 mPa·s (degree of polymerization about 60), 1.3 parts by weight of the above formula (1-1) The agent is mixed for 30min under the moisture barrier condition (the moisture barrier is to prevent the scavenger from reacting with the water vapor in the air, protect with nitrogen during the weighing and feeding process, and after feeding, the vacuum degree is less than -0.098Mpa); Parts by weight of methyltrimethoxysilane, 1.5 parts by weight of 3-aminopropyltriethoxysilane and 0.1 parts by weight of dibutyltin dilaurate catalyst, mixed for 30 minutes under a vacuum degree of less than -0.098Mpa; finally, dry N2 Under the protection of the packaging, seale...

Embodiment 2

[0118] Example 1 was repeated, except that 1.5 parts by weight of the scavenger of the above formula (1-2) was used instead of 1.3 parts by weight of the scavenger of the above formula (1-1).

Embodiment 3

[0120] Example 1 was repeated, except that 0.7 parts by weight of the scavenger of the formula (1-3) was used instead of 1.3 parts by weight of the scavenger of the formula (1-1).

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Abstract

The invention relates to a novel hydroxyl scavenging agent with a formula (I), wherein R, R1, R', A and x have meanings given by the context. Besides, the invention further relates to a preparation method of the hydroxyl scavenging agent and dealcoholization room temperature vulcanized silicone rubber containing the hydroxyl scavenging agent. The hydroxyl scavenging agent is capable of not only capturing free alcohol produced by the dealcoholization room temperature vulcanized silicone rubber, but also accelerating deep solidification speeds of the dealcoholization room temperature vulcanized silicone rubber.

Description

Technical field [0001] The present invention relates to a new type of hydroxyl scavenger, its preparation method and dealcoholization type room temperature vulcanized silicone rubber containing it. Background technique [0002] A common problem of dealcoholized RTV silicone rubber is that its vulcanization performance will gradually decrease or even disappear with the extension of storage time. The main reason is the existence of free alcohol in dealcoholized RTV silicone rubber in the organic metal catalyst. Under the equilibrium reaction with polysiloxane, the non-crosslinking function (CH 3 O)(CH 3 ) 2 SiO 1 / 2 End group. For this reason, many attempts have been made to improve the storage stability of dealcoholized RTV silicone rubber. One method is to use titanate chelate as a catalyst, which can improve the storage stability of dealcoholized RTV silicone rubber to a certain extent, but during storage and after vulcanization, dealcoholized RTV silicone rubber It is very eas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08K5/5445C07F7/18C08L83/04C08J3/24
Inventor 徐珊乐小飞赵勇刚
Owner GUANGZHOU HUITIAN FINE CHEM