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Silicone rubber composite material with gradient bubble structure, and preparation method of silicone rubber composite material

A technology of composite materials and silicone rubber, which is applied in the field of silicone rubber composite materials with gradient cell structure and preparation, can solve the problems of different and no research reports on silicone rubber materials, and achieve easy operation, good application prospects, and good application prospects Effect

Active Publication Date: 2018-08-10
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The novelty search results of domestic and foreign patents and literatures show that: currently, the literature research reports on the preparation of cell gradient materials by supercritical fluid foaming technology use thermoplastic polymers, and there are no research reports on silicone rubber materials; the above methods may use lamination Hot pressing to form a gradient composite material or using different heterogeneous nucleating agents to adjust the cell diameter or using a single-port mold to control the directional adsorption of carbon dioxide in the matrix to form a concentration gradient is different from the rate gradient formed by the unilateral limited method of the present invention.

Method used

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  • Silicone rubber composite material with gradient bubble structure, and preparation method of silicone rubber composite material
  • Silicone rubber composite material with gradient bubble structure, and preparation method of silicone rubber composite material
  • Silicone rubber composite material with gradient bubble structure, and preparation method of silicone rubber composite material

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preparation example Construction

[0037] The first technical problem to be solved in the present invention is to provide a preparation method of a silicone rubber composite material with a gradient cell structure, the preparation method comprising the following steps:

[0038] 1) Preparation of silicone rubber composite material: using existing methods to make silicone rubber raw rubber, reinforcing filler, structural control agent and vulcanizing agent into a compound rubber;

[0039] 2) Preparing a silicon rubber composite body: hot pressing the mixed rubber obtained in step 1) to form a green body;

[0040] 3) Supercritical fluid foaming: Cover a part of the body obtained in step 2) with a stainless steel material, then place it in a high-pressure reactor, feed the gas for foaming, heat up, and pressurize until the gas turns into Supercritical fluid, when the supercritical fluid reaches a saturated state in the green body, the composite material green body is foamed by a rapid pressure relief method to obta...

Embodiment 1

[0048] A preparation method of a silicone rubber composite material with a gradient cell structure, comprising the following steps:

[0049] (1) Preparation of silicone rubber composite materials

[0050] Add 0.225g of graphene, 9g of white carbon black, 1.8g of hydroxy silicone oil, and 45g of methyl vinyl silicone rubber raw rubber into the internal mixer for mixing. After mixing, take out the mixture, and add 0.9g of it at room temperature after cooling Dicumyl peroxide, after mixing for 20min, obtains a silicone rubber composite material;

[0051] (2) Preparation of silicone rubber composite body

[0052] The composite material obtained in step (1) is placed on a flat hot plate at a temperature of 130° C. and a pressure of 10 MPa. After holding the pressure for 4 minutes under vacuum conditions, a sheet-shaped green body (cuboid) with a thickness of 2 mm is obtained;

[0053] (3) Supercritical fluid foaming

[0054] The green body is placed on a stainless steel plate, t...

Embodiment 2

[0059] A preparation method of a silicone rubber composite material with a gradient cell structure, comprising the following steps:

[0060] (1) Preparation of silicone rubber composite materials

[0061] Add 0.45g of graphene, 9g of white carbon black, 1.8g of hydroxy silicone oil, and 45g of methylvinyl silicone rubber raw rubber into the internal mixer for mixing. After the mixing is complete, take out the mixture, and add 0.9g of it at room temperature after cooling. Dicumyl peroxide, after mixing for 20min, obtains a silicone rubber composite material;

[0062] (2) Preparation of silicone rubber composite body

[0063] The composite material obtained in step (1) is placed on a flat hot plate at a temperature of 130° C. and a pressure of 10 MPa. After holding the pressure for 4 minutes under vacuum conditions, a sheet-shaped green body (cuboid) with a thickness of 2 mm is obtained;

[0064] (3) Supercritical fluid foaming

[0065] The green body is placed on a stainless...

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Abstract

The invention belongs to the field of silicone rubber foam materials, and relates to a silicone rubber composite material with a gradient bubble structure, and a preparation method of the silicone rubber composite material. The invention provides the preparation method of the silicone rubber composite material with the gradient bubble structure. The preparation method comprises the following steps: (1) preparing a silicone rubber composite material; (2) preparing a silicone rubber composite material green body; (3) carrying out supercritical fluid foaming: covering part of the green body, obtained in the step (2), with a metal material, and then putting the green body into a high pressure reaction kettle, introducing gas for foaming, heating, and pressurizing until the gas is converted into supercritical fluid; after the supercritical fluid reaches a saturated state in the green body, using a rapid pressure relief method to enable composite material green body to be foamed so as to obtain a foamed material; (4) vulcanizing. The preparation method provided by the invention is not only simple and stable in process, low in requirement for equipment and simple to operate, but is also good in controllability, thus having a very good application prospect.

Description

technical field [0001] The invention belongs to the field of silicone rubber foam materials, and relates to a silicone rubber composite material with gradient cell structure and a preparation method. Background technique [0002] Silicone rubber foam material is a porous elastic material formed by foaming silicone rubber. It integrates the characteristics of silicone rubber material and foam material. It not only has excellent characteristics such as high and low temperature resistance, aging resistance, radiation resistance, and physiological inertia, but also has relatively Low density, good characteristics of absorbing mechanical vibration and shock, and sound insulation, heat insulation, sealing and other functions, can be used as high-performance materials such as sealing, shock absorption, insulation, heat insulation, etc., in transportation, electronics industry and aerospace, etc. Fields have a wide range of uses. [0003] Functionally graded materials (Functionally...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04C08L83/07C08L83/08C08L83/05C08K13/04C08K7/24C08K3/04C08K3/36C08K3/22C08K3/26C08K7/28C08K3/34C08K5/14C08J9/12
CPCC08J9/0061C08J9/0066C08J9/122C08J2203/06C08J2383/04C08J2383/07C08J2383/08C08J2483/05C08K3/04C08K3/042C08K3/346C08K3/36C08K5/14C08K7/24C08K7/28C08K13/04C08K2003/2227C08K2003/2241C08K2003/2275C08K2003/2296C08K2003/265
Inventor 廖霞张远李浚松唐婉玉李光宪
Owner SICHUAN UNIV
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