Intermediate sandwich type heat insulating layer material and preparation method thereof

Abstract

The invention discloses an intermediate sandwich type heat insulating layer material and a preparation method thereof. The method comprises the following steps: 1) pre-vulcanization: preparing a firstanode film according to the structure of a lower heat insulating layer, performing lower layer patching in the first anode film, and then performing pre-vulcanization treatment after closing the filmwith a cathode film, so as to obtain a lower heat insulating layer; 2) bonding: applying an adhesive to the upper surface of the lower heat insulating layer and the lower surface of a reinforcing layer, and compacting the lower heat insulating layer and the reinforcing layer to ensure that the lower heat insulating layer and the reinforcing layer is completely fitted; 3) final vulcanization: preparing a second anode film according to the structure of an upper heat insulating layer, applying the adhesive to the upper surface of the reinforcing layer, performing upper layer patching, covering the second anode film on the upper layer patches, and performing final vulcanization treatment after closing the film with the cathode film, so as to obtain the intermediate sandwich type heat insulating layer material. According to the invention, the lower heat insulating layer is subjected to pre-vulcanization and molding firstly, so that the positioning of the reinforcing layer and the lower heat insulating layer as well as the fitting of molded surfaces are ensured, the simultaneous flow of the upper heat insulating layer and the lower heat insulating layer is reduced, and the elongation deformation of the reinforcing layer is avoided, thereby ensuring that the size of the reinforcing layer is more precise.

Description

technical field [0001] The invention relates to the technical field of heat insulation materials, in particular to a sandwich type heat insulation layer material and a preparation method thereof. Background technique [0002] At present, the commonly used thermal insulation layer can be divided into three types according to the base material: rubber-type thermal insulation material, which is made by adding ablation-resistant filler to rubber-like elastomer; resin-type thermal insulation material, which is made by adding ablation-resistant filler to resin as the base ; At the same time, in recent years, ablation-resistant and heat-insulating materials that use both have begun to appear. In general, flexible elastomers, such as nitrile rubber (NBR), ethylene propylene diene monomer (EPDM) and silicone rubber, etc., are often used as the matrix of rubber-type insulation layers due to their good process performance, low density and low thermal conductivity. Material. The inter...

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Problems solved by technology

Although the above molding process can improve the ablation resistance and erosion resistance of the heat insulation layer, due to the flow and thermal expansion of the two heat insulation layers during the heating and pressurization vulcanization process, the structure of the middle layer often deforms and elongates , thus affecting the entire structure

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