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

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...

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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.

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