Aerogel vacuum insulation panel, core material thereof and preparation methods thereof

Abstract

The invention provides preparation methods for a vacuum insulation panel and a core material thereof. In the preparation methods, waste solid coal ash and straw ash discharged from a thermal power plant in China are used as a silicon source, thermokalite dissolution reaction is performed at a high temperature and a high pressure, an innovative inorganic dispersion sol-gel method and an epoxide method preparation process are adopted, a coagulation method for preparing organic aerogel, a co-polymerization method for preparing hydrophobic aerogel, and a doped modified aerogel in-situ method are combined, an in-situ co-precursor modification method is adopted, at the same time, a silane with a hydrophobic group is introduced and mixed with the silicon source for a sol-gel process, secondary hydrophobic modification of gel and organic matter toughening and strengthening are adopted, an inorganic / organic hybrid composite bulk aerogel vacuum insulation panel core material is prepared under normal pressure, and a vacuum insulation panel is prepared by using the core material. The vacuum insulation panel core material of the invention can be separately applied to the building thermal insulation engineering, has good anti-NIR performance, high strength and good toughness, does not crush under extrusion and is low in cost. The aerogel vacuum insulation panel of the invention does not produce a cold and heat bridge phenomenon, with the vacuum degree being maintained for a long time, is not prone to bulging and scratching, and can be made into a bulk.

Description

technical field [0001] The invention belongs to the technical field of inorganic / organic hybrid porous material airgel preparation, relates to the technical field of building heat preservation, energy saving and consumption reduction, waste solid utilization and recycling economy, and specifically relates to a method of using fly ash as a silicon source and microwave drying to prepare inorganic / organic aerogels. Method for hybrid airgel vacuum insulation panel and its core material. Background technique [0002] With the development of my country's thermal power generation industry, a large amount of waste solid fly ash and straw ash are discharged. The annual discharge of fly ash exceeds 1 billion tons, and the total accumulation reaches several billion tons, which seriously threatens my country's economic construction. and the ecological environment, while the utilization rate of fly ash in my country is less than 50%, and the added value is low. How to make rational use of...

AI Technical Summary

Problems solved by technology

[0005] The existing airgel vacuum insulation panels have the following problems: (1) the existing single silica aerogel and single carbon aerogel cannot be used alone in building insulation projects, and the near-infrared radiation resistance Poor, poor toughness, it will break when pinched

(2) The cost of the core material of the vacuum insulation panel prepared by the existing silica airgel is high, and the preparation and molding of the large block airgel panel is difficult

(3) The existing vacuum insulation panels are prone to cold and heat bridges due to thermal packaging problems and too wide edges of the reserved panels, and the vacuum degree is difficult to protect for a long time, which is prone to bag swelling and hanging damage

(4) In the process of airgel preparation, the drying process has become the biggest problem. This is the final step in the preparation of airgel. The high cost of supercritical drying makes it difficult to mass-produce. Freeze drying also has too many restrictions, and atmospheric drying is the most promising The existing problem is that during the drying process, the additional shrinkage internal stress brought by the liquid concave surface will cause devastating damage to the skeleton structure of the airgel, causing the structure to collapse and greatly reducing the performance of the airgel.