Sprayable silicone rubber-based lightweight ablation-resistant thermal insulation coating and application thereof

Abstract

The invention relates to a sprayable silicone rubber-based lightweight ablation-resistant thermal insulation coating and an application thereof. The coating is prepared from a component A and a component B according to a mass ratio of 100:0.5 to 100:3, the component A is prepared from, by weight, 80-110 parts of room temperature-vulcanized silicone rubber, 40-50 parts of a flame-retardant filler,3-5 parts of a chopped carbon fiber filler, 10-12 parts of a silicon-based reinforcing filler, 0.5-1 part of a dispersing aid, 5-10 parts of a coupling agent and 100-150 parts of a solvent, and the component B is prepared from a cross-linking agent tetraethyl orthosilicate or hydrogen-containing silicone oil and a catalyst dibutyltin dilaurate or tetrabutyl titanate according to a mass part ratioof 7:3. Compared with coatings in the prior art, the coating in the invention has a higher bonding strength with the coating layer of a metal substrate; the chopped carbon fibers form a strong honeycomb structure in a residual carbon layer, so that the coating layer has excellent erosion resistance, and can effectively protect the surfaces of rockets and other aeronautics and astronautics devicesfrom being ablated and damaged; and the ablation products of the coating mainly comprise CO2 and SiO2, so the coating is green and non-polluting.

Description

technical field [0001] The invention relates to the technical field of high-temperature ablation-resistant coatings, in particular to a sprayable silicone rubber-based lightweight ablation-resistant and heat-insulating coating and its application. Background technique [0002] With the development of my country's aerospace and national defense technology, ablation-resistant coatings have been used more and more. For example, the surface of various aerospace vehicles such as the surface of the bundled launch vehicle body needs to be coated with a layer of ablation-resistant and heat-resistant coating to resist the heat flow load of hundreds to tens of thousands of kilowatts per square meter. At present, the traditional heat-resistant coatings on the market use phenolic resin, epoxy resin, etc. as matrix resins, relying on the addition of low-density fillers (cork powder, hollow glass microspheres, etc.) ) to achieve the ablation resistance of the coating. This type of coatin...

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Problems solved by technology

Its characteristic is to use methyltriethylsilane, dimethyldiethoxysilane and phenyltriethoxysilane as raw materials to prepare silicone resin through hydrolysis and condensation, and select the above-mentioned self-made silicone resin 30-40% , 30-45% of muscovite powder, 10-20% of chromium trioxide, 10-20% (weight) of aluminum silicate fiber, diluted with absolute ethanol, and prepared into ablation heat-insulating coating, but, because its resin adopts The most important thing is silicone resin, which cannot be cured at room temperature, let alone achieve good bonding with metal substrates

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