Preparation method for aerogel vacuum insulation board and core material thereof

Abstract

The invention provides a preparation method for a vacuum insulation board and a core material thereof. The preparation method uses a siliceous non-metallic mineral clay as a silicon source, obtains amixed water glass solution by a high temperature and high pressure alkali solution reaction, and achieves a preparation process without by-products. An inorganic / organic hybrid aerogel vacuum insulation board is prepared by an inorganic dispersion sol-gel method under a normal pressure, expensive silicon alkoxide chemical raw materials are replaced, so that the comprehensive utilization added value of non-metallic mineral clay in China is greatly increased, the process is simple and easy to implement, the cost is low, and large-scale application potential is achieved. The vacuum insulation board can be separately applied to a building thermal insulation project, have good anti-near-infrared performance, good strength and toughness, low cost, no cold and hot bridge phenomenon, long vacuum retention time and non-easy bag expansion and scratch, is combined with double-layer three-dimensional reinforced components, and achieves the possibility of preparation of the large-body vacuum insulation board.

Description

technical field [0001] The invention relates to the preparation of porous materials from non-metallic minerals, the technical field of silica airgel building energy saving, consumption reduction and heat preservation, in particular to a method of preparing inorganic / organic hybrid gas by using siliceous non-metallic mineral clay as a silicon source by microwave drying The invention relates to a preparation method of a gel vacuum insulation panel and a core material thereof. Background technique [0002] my country is rich in siliceous non-metallic mineral clay mineral resources, but the degree of development and utilization is not high, and the degree of deep processing is even lower, resulting in a serious waste of non-metallic mineral resources. Therefore, strengthening the research on the deep processing of non-metallic minerals, making non-renewable mineral resources rationally developed and utilized, and increasing the added value of non-metallic mineral utilization are...

AI Technical Summary

Problems solved by technology

But, there is following problem in current airgel vacuum insulation panel: (1) adopt silicon alkoxide class as; (TEOS, TMOS) polysiloxane etc. are silicon source, and the silica airgel cost of preparation is high, It is expensive and has certain toxicity, which cannot meet the market demand; (2) A single silicon aerogel and a single carbon aerogel are brittle, low in strength, and poor in toughness, and cannot be used alone in building insulation projects. High-quality non-metallic mineral clay resources, low degree of deep processing, and low added value; (3) In the process of preparing airgel materials by drying at normal pressure, the drying process has become the biggest problem restricting the preparation of airgel. When drying at room temperature, there are The two-phase interfacial tension of gas and liquid can easily cause the gel skeleton to collapse and lead to shrinkage. The key technology is to find ways to reduce the capillary tension of the solvent and improve the strength of the gel skeleton. Non-aerogel; 4) The existing vacuum insulation panels are sealed on three sides and four sides, causing the edge of the panel to be too wide, and there is no insulation layer in the middle of 10-15mm between the panels and panels, resulting in thermal bridge phenomenon; (5) For the existing vacuum insulation panels, it is easy to hang the phenomenon of broken bags, and the vacuum degree is difficult to maintain for a long time

It is difficult to form a vacuum insulation panel with a large airgel material, and it provides a silicon source that is easy to obtain and has a simple process, which can greatly reduce the cost of airgel preparation and improve the mechanical properties of silica airgel. To improve the added value of the comprehensive utilization of siliceous non-metallic mineral clay, a preparation method of using siliceous non-metallic mineral clay as a silicon source for microwave drying to prepare inorganic / organic hybrid airgel vacuum insulation panels and their core materials