Silicone rubber composite material capable of undergoing ceramization and preparation method thereof

Abstract

The invention relates to a silicone rubber composite material capable of undergoing ceramization and a preparation method thereof. The material comprises the following components in parts by weight: 25-35 parts of silicone rubber, 15-20 parts of aluminium hydroxide, 20-25 parts of ammonium polyphosphate, 25-30 parts of clay minerals with layered structures and 0.3-0.6 part of vulcanizing agent. The preparation method of the material comprises the following steps: mixing the materials in an open mill or an internal mixer uniformly, carrying out primary vulcanization moulding in a compression moulding press and carrying out secondary vulcanization in a forced air drying oven. The silicone rubber composite material capable of undergoing ceramization has the main characteristics that the product formed in a wide temperature range of 200-1000 DEG C has self-supporting property and can be used in the field of flame retardance and fireproofing. The silicone rubber composite material capable of undergoing ceramization is simple to prepare and easy to machine-moulded, can adopt existing rubber product machining and preparation equipment, is convenient to produce industrially and has an extensive application prospect.

Description

Technical field: [0001] The invention relates to a silicon rubber composite material and a preparation method thereof, in particular to a self-supporting ceramizable silicon rubber composite material in a wide temperature range and a preparation method thereof, belonging to the field of refractory materials. Background technique: [0002] The ceramizable silicone rubber composite material has the characteristics of ordinary silicone rubber at room temperature, but it can form a ceramic protective layer at high temperature, which has a certain strength, thereby protecting the interior of the material from high temperature damage. The invention of ceramizable silicone rubber composite materials provides new ideas and methods for flame-retardant and fire-resistant materials. [0003] There has been some research in the field of ceramicization of silicone rubber-based composite materials at home and abroad. For example, the publication number CN104672916A discloses a kind of ce...

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Problems solved by technology

[0004] Although the service temperature of silicone rubber can reach 200°C, the thermal decomposition products of inorganic components in ceramizable silicone rubber composites may catalyze the cracking of silicone rubber, making silicone rubber prone to heat generation in an aerobic environment of 200-600°C. Cracking and pulverization greatly reduce the self-support and strength of composite materials in the ceramicization process and affect the use. At present, the strength and strength of ceramic products are improved by adding low melting point blends or glass powders containing alkali metals at home and abroad. Reduce the ceramization temperature, but due to the migration of alkali metal ions in the low melting point blend containing alkali metal or glass powder during the ceramization process of the composite material, the insulation of the composite material is reduced, and the current self-supporting ceramizable composite material The performance evaluations are all focused on 1000°C, without considering the self-supporting properties at 200-1000°C during the entire ceramicization process, and silicone rubber is prone to thermal cracking and pulverization in an aerobic environment at 200-600°C, which may lead to its self-supporting properties. deteriorating and affecting the use

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