Preparation method of porous thermal insulation material with high closed porosity

Abstract

The invention discloses a preparation method of a porous thermal insulation material with high closed porosity. The invention belongs to the technical field of thermal insulation material preparation.According to the preparation method of the porous thermal insulation material with high closed porosity, thermal dissipation particles are embedded into organic foam, so after the organic foam is burnt out, the heat dissipation particles can be remained in the porous ceramic heat insulation material; in this process again, thermal expansion in the thermal dissipation particles is realized, and the outer gas decomposition layer is exploded, and a plurality of fragments are formed; along with continuous sintering, fragments of the outer gas decomposition layer are gradually melted, so the carbon fiber particles and the heat insulation particles are adhered to the pore wall of the porous ceramic heat insulation material together; after cooling, the strength of the hole wall can be effectively improved, meanwhile, the effect of blocking the hole wall is achieved, the hole closing rate is effectively increased, and due to the elasticity of the outer gas decomposition layer, the shock resistance of the porous ceramic thermal insulation material can be improved during accidental collision, and the situation that the hole wall is broken is reduced.

Description

technical field [0001] The invention relates to the technical field of heat insulation material preparation, and more specifically relates to a preparation method of a porous heat insulation material with high closed porosity. Background technique [0002] Thermal insulation material is a material that can block the transfer of heat flow, also known as thermal insulation material. Traditional thermal insulation materials, such as glass fiber, asbestos, rock wool, silicate, etc., new thermal insulation materials, such as airgel felt, vacuum panels, etc. [0003] Heat insulation materials are divided into three categories: porous materials, heat reflective materials and vacuum materials. The former uses the pores contained in the material itself to insulate heat, because the thermal conductivity of air or inert gas in the pores is very low, such as foam materials, fiber materials, etc.; heat reflective materials have a high reflection coefficient and can reflect heat, such as...

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Problems solved by technology

[0005] Most of the existing thermal insulation materials are porous structures. According to the fluidity, the thermal insulation performance of closed-cell thermal insulation materials is higher than that of open-pore thermal insulation materials. During the preparation of thermal insulation materials, it is difficult to control the opening and closing of gaps. As a result, the porous material after forming has a high opening rate. At the same time, the heat insulation material is porous and brittle. After forming, it is very easy to cause the pore wall to break due to collision, making the closed cells become open pores, which further leads to an increase in the opening rate. , affecting the overall thermal insulation of the insulation material

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