Light composite rubber and preparation method thereof

A lightweight, composite technology, applied in the rubber field, can solve the problems of decreased mechanical properties and flame retardant properties, pollute the environment, not environmental protection, etc., and achieve the effect of improving mechanical properties and thermal insulation properties.

Active Publication Date: 2020-05-29
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Foaming silicone rubber is a commonly used lightweight method. Foaming can also improve the heat insulation performance of silicone rubber, but the mechanical properties and flame retardancy will be significantly reduced. In a...

Method used

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  • Light composite rubber and preparation method thereof
  • Light composite rubber and preparation method thereof
  • Light composite rubber and preparation method thereof

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preparation example Construction

[0030] In this application, the silica airgel / hollow glass microsphere composite was first prepared, which is an important component of lightweight composite rubber, and its preparation method directly affects the performance of lightweight composite rubber. Specifically, the embodiment of the present invention discloses a preparation method of a silica airgel / hollow glass microsphere composite, comprising the following steps:

[0031] A) mixing methyltrimethoxysilane, ethyl orthosilicate, silane coupling agent, water, ethanol and an acidic catalyst to obtain a modified silica sol;

[0032] B) cross-linking the modified silica sol with a basic catalyst to obtain a modified silica gel;

[0033] C) mixing the modified silica gel with hollow glass microspheres to obtain a modified silica gel / hollow glass microsphere composite;

[0034] D) The modified silica gel / hollow glass microsphere composite is solvent replaced and then vacuum-dried to obtain a silica airgel / hollo...

Embodiment 1

[0073] Embodiment 1 provides a kind of preparation method of lightweight composite rubber containing aerogel, and the detailed preparation steps are as follows:

[0074] (1) Mix methyltrimethoxysilane, ethyl orthosilicate, water, and ethanol with a molar ratio of 1:3:10:30, add 1mol / L acetic acid drop by drop to adjust the pH to about 2, and control the reaction temperature After 15 minutes at 55°C, after the silicon source is fully hydrolyzed, a certain amount of γ-aminopropyltriethoxysilane is added to dehydrate and condense with the hydroxyl groups on the surface of the silica sol to obtain a modified silica sol;

[0075] (2) Add 0.5mol / L sodium hydroxide dropwise to the modified silica sol obtained in step (1), until the pH is adjusted to 7-8, and the cross-linking reaction obtains the modified silica gel;

[0076] (3) Add the modified silica gel and hollow glass microspheres VS5500 obtained in step (2) into a low-speed mixer respectively, and mix and stir at 30 rpm fo...

Embodiment 2

[0085] The difference between Example 2 and Example 1 is that the ratio of raw materials in parts by weight is: 67.5 parts of raw methyl vinyl silicone rubber, 5 parts of silica airgel / hollow glass microsphere composite, flame retardant MM -38 parts of F, 15 parts of hydroxy silicone oil, 1 part of 2,5-dimethyl-2,5-bis(tert-butyl peroxy), 4,4'-bis(α,α-dimethylbenzyl) 1 part of diphenylamine, 0.5 part of 2-mercaptobenzimidazole and 2 parts of zinc stearate, wherein, the silica airgel and hollow glass microspheres in the composite of silica airgel / hollow glass microspheres The weight ratio of VS5500 is 1:4.

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Abstract

The invention provides a preparation method of a silicon dioxide aerogel/hollow glass bead compound. The invention further provides a light composite rubber, which is prepared from a main antioxidant,a plasticizer, raw silicone rubber, a flame retardant, a lubricant, an auxiliary antioxidant, a vulcanizing agent and the silicon dioxide aerogel/hollow glass bead compound. The invention further provides a preparation method of the light composite rubber. The provided light composite rubber has the characteristics of light weight, high strength, flame retardance, environment friendliness, excellent heat insulation performance and the like.

Description

technical field [0001] The invention relates to the technical field of rubber, in particular to an aerogel-containing lightweight composite rubber and a preparation method thereof. Background technique [0002] Silicone rubber is an elastomer whose main chain is alternately linked by Si-O-Si bonds and organic groups are connected to the side chains. Due to the special molecular structure, silicone rubber has many unique properties, such as: excellent weather resistance, aging resistance, chemical resistance and high and low temperature resistance, etc. Because the main chain of silicone rubber is particularly flexible, the strength of unreinforced silicone rubber is low, so a reinforcing agent must be added in actual use. The most commonly used reinforcing agent in silicone rubber is silica; The general term for silica and precipitated silica, but there are a large number of hydroxyl groups on the surface of silica, the surface energy is high, and the compatibility with sil...

Claims

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Application Information

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IPC IPC(8): C08K13/06C08K9/06C08K7/26C08K7/28C08L83/07
CPCC08K7/26C08K7/28C08K9/06C08K13/06C08K2201/005C08L83/04
Inventor 吴长征谢毅
Owner UNIV OF SCI & TECH OF CHINA
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