A kind of building thermal insulation airgel material and preparation method thereof

Abstract

A building thermal insulation airgel material and a preparation method thereof. The building thermal insulation airgel material is characterized in that the raw material composition (parts by weight) is: 70-90 parts of silica sol, 10-28 parts of polyvinyl alcohol hot melt adhesive, and 1-2 parts of hydrophobic agent. The present invention takes silica sol as the main body, polyvinyl alcohol hot-melt adhesive as thermoplastic melt colloid, and inert gas as support body, through the instantaneous high temperature and high pressure of the continuous kneading screw reactor, the gel is in the extrusion cylinder Extruded, the liquid component in the wet gel expands due to instantaneous evaporation at the die mouth, and the inert gas acts as the airgel support while the liquid component volatilizes, ensuring that the airgel’s complete skeleton structure does not collapse, and the process is completed Transformation of wet gels to aerogels. The preparation process of the invention avoids the complex process of the supercritical drying method, and also avoids the defect of airgel channel collapse during normal pressure drying. The production process is simple, the operation is stable, and it can be produced continuously on a large scale. The airgel obtained has good strength, high porosity, and excellent thermal insulation performance, and can be applied to the fields of building insulation boards, insulation mortars, and insulation coatings.

Description

technical field [0001] The invention relates to the field of building thermal insulation materials, in particular to a building thermal insulation airgel material and a preparation method. Background technique [0002] Energy problems in today's world have become a major issue affecting development. Since building energy consumption accounts for 30% to 40% of the total energy consumption, building energy conservation is of great significance. Building thermal insulation materials are an important measure for building energy conservation. At present, the most widely used form of thermal insulation in the domestic market is external wall insulation. Due to the low thermal conductivity of organic thermal insulation materials and good thermal insulation performance, they are currently widely used in building energy conservation. However, organic thermal insulation materials have various disadvantages, such as the use of petroleum resources as raw materials, poor environmental pr...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the defects of low airgel strength, complicated preparation process and high cost at present, the present invention provides a building thermal insulation airgel material that can be used in the field of building energy saving