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Low-density small-pore-diameter silicon-rubber composite material and preparation method thereof

A composite material and silicone rubber technology, which is applied in the field of preparation of low-density micro-pore silicone rubber composite materials, can solve the problems of reducing the flexibility of silicone rubber composite materials, difficult to control the pore size, and difficult to obtain density, etc., and achieves easy industrial production and uniform pores. The effect of fine, simple preparation process

Inactive Publication Date: 2017-12-08
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If only hard microspheres are used for filling, the hard microspheres are easy to break, which will greatly reduce the flexibility of the silicone rubber composite material; the single use of flexible hollow microspheres will reduce the strength of the silicone rubber composite material, and the use of organic foaming agents will reduce the strength of the silicone rubber composite material. Foam, its decomposition products do not meet environmental protection requirements
All of the above limit the application of microporous silicone rubber composites
In addition, due to the contradiction between foaming and silicone rubber curing, it is difficult to control the pore size, especially it is difficult to obtain silicone rubber products with low density and uniform and fine pores

Method used

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  • Low-density small-pore-diameter silicon-rubber composite material and preparation method thereof
  • Low-density small-pore-diameter silicon-rubber composite material and preparation method thereof
  • Low-density small-pore-diameter silicon-rubber composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Get 100 parts by mass of vinyl polysiloxane, add 0.2 parts of platinum catalyst in advance; 10 parts by mass of hydrogen-containing silicone oil, add 0.2 parts of reaction inhibitor in advance, 5 parts by mass of sodium bicarbonate powder, 5 parts by mass of thermally expandable microspheres, The above components are dispersed by mechanical stirring to obtain a premix, and then the premix is ​​further blended by using a three-roll mill to disperse the components uniformly to obtain a premix. Then use a three-roll mill with a roll distance of 0.1mm to grind the mixed material to obtain a uniformly mixed material, and at the same time remove the air bubbles in the mixed colloid. In order to ensure the complete removal of the air bubbles, use a vacuum box again to further exhaust it. . The blended rubber was poured into the designed mold, and cured at a temperature of 60° C. for 1 hour to obtain a cured gel. Then the temperature was raised to 140°C, and the heat preservat...

Embodiment 2

[0029] Take 100 parts by mass of vinyl polysiloxane, add 0.1 part of platinum catalyst in advance; 10 parts by mass of hydrogen-containing silicone oil, add in advance 0.1 part of reaction inhibitor, 10 parts by mass of sodium bicarbonate powder, and 10 parts of thermally expandable microspheres. The above components are dispersed by mechanical stirring to obtain a premix, and then the premix is ​​further blended by using a three-roll mill to disperse the components uniformly to obtain a premix. Then use a three-roll mill with a roll distance of 0.1mm to grind the mixed material to obtain a uniformly mixed material, and at the same time remove the air bubbles in the mixed colloid. In order to ensure the complete removal of the air bubbles, use a vacuum box again to further exhaust it. . The blended rubber was poured into the designed mold, and cured at a temperature of 70°C for 1 hour to obtain a cured gel. Then the temperature was raised to 140°C, and the heat preservation t...

Embodiment 3

[0031] Take 100 parts by mass of vinyl polysiloxane, add 0.2 parts of platinum catalyst in advance; The above components are dispersed by mechanical stirring to obtain a premix, and then the premix is ​​further blended by using a three-roller mill to uniformly disperse each component to obtain a premix. Then use a three-roll mill with a roll distance of 0.1mm to grind the mixed material to obtain a uniformly mixed material, and at the same time remove the air bubbles in the mixed colloid. In order to ensure the complete removal of the air bubbles, use a vacuum box again to further exhaust it. . The blended rubber was poured into the designed mold, and cured at a temperature of 70°C for 1 hour to obtain a cured gel. Then the temperature was raised to 140°C, and the heat preservation treatment was carried out for 2 hours, so that the sodium bicarbonate powder filled in the colloid was decomposed and gasified, and at the same time, the liquid hydrocarbon inside the heat-expandab...

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Abstract

The invention relates to the field of silicon rubber and particularly relates to a low-density small-pore-diameter silicon-rubber composite material and a preparation method thereof. The silicon-rubber composite material comprises the following materials in parts by weight: 100 parts of vinyl polysiloxane, 0.01-1 part of a reaction inhibitor, 0.01-1 part of a cross-linking catalyst, 2-10 parts of hydrogen-containing silicon oil, 5-30 parts of thermal-expansion microspheres and 5-30 parts of superfine sodium bicarbonate powder. According to the low-density small-pore-diameter silicon-rubber composite material and the preparation method, the preparation process is simple, the hollow thermal-expansion microspheres and the superfine sodium bicarbonate powder are blended with all the components of silicon rubber according to a premixing ratio so as to be uniformly dispersed in silica-gel colloid, the mixture is cured to obtain composite silica-gel premix, and then the premixed composite colloid is put in a reasonable temperature for heat treatment so as to obtain the low-density microporous silicon-rubber composite material.

Description

technical field [0001] The invention relates to a silicone rubber composite product and a preparation method thereof, in particular to the preparation of a low-density microporous silicone rubber composite material. Background technique [0002] Microporous polymer material is a composite material obtained by mixing, curing, molding and curing matrix resin (binder) and hollow microspheres. Silicone rubber composite materials combine the advantages of silicone rubber materials such as excellent high and low temperature resistance, non-toxicity, excellent chemical stability, excellent electrical insulation, light aging resistance and physiological inertness, and also have the low density and quality of microporous materials. Lightweight, good damping and high resilience. Because of its unique structure and excellent performance, it has been widely used in chemical industry, automobile, electrical and electronic, machinery, medicine, aerospace and other fields. [0003] At pr...

Claims

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Application Information

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IPC IPC(8): C08L83/07C08L83/05C08K7/22C08K3/36C08J9/08
CPCC08J9/08C08J2203/02C08J2383/04C08J2483/04C08K2201/003C08L83/04C08L2203/14C08L2205/025C08K7/22C08K3/36
Inventor 乔梁姚代川郑精武应耀李旺昌余靓车声雷
Owner ZHEJIANG UNIV OF TECH
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