Vacuum heat insulating plate and preparation and application thereof

Abstract

The invention provides a vacuum heat insulating plate and preparation and application of the vacuum heat insulating plate. The vacuum heat insulating plate comprises a heat insulating core material and a film material coating the heat insulating core material. The heat insulating core material comprises nanoscale silicon dioxide and is formed by mixing the nanoscale silicon dioxide with multi-scale expanded perlites and chopped fibers in the weight ratio of 10:5-30:1. The specific surface area of the nanoscale silicon dioxide is 100-400m<2> / g. The incompact stacking density of the multi-size expanded perlites is lower than 350kg / m<3>. The length of the chopped fibers is less than 10mm, and the diameter is less than 20mum. The vacuum heat insulating plate is obtained by uniformly mixing the raw materials, putting the uniformly mixed raw materials into a mold for pressing and molding, taking out the molded core materials, drying the molded core materials to constant weight, putting the core materials into a bag which is prepared from the film material in advance, vacuumizing till the vacuum degree is less than 0.1Pa, and then performing hot sealing. The vacuum heat insulating plate is high in strength and good in heat insulating effect. In this way, the vacuum heat insulating plate is applied to the heat insulation of building walls.

Description

technical field [0001] The invention mainly relates to a preparation method for building thermal insulation materials. In particular, it relates to a preparation method of a vacuum heat insulating board which is light, flame retardant, low in cost, and has a thermal insulation effect 5-10 times that of traditional thermal insulation materials, and which can be used in the construction industry. Background technique [0002] With the rapid development of the economy and the improvement of people's living standards, people's demand for buildings is also increasing. The 21st century is a very large development period of energy consumption, and the problem of high energy consumption in the construction industry is becoming increasingly prominent. The "Energy Conservation Law of the People's Republic of China" implemented in 1998 made provisions on building energy conservation, requiring buildings to improve thermal insulation performance and reduce energy consumption for heatin...

AI Technical Summary

Problems solved by technology

Scholars such as Vos et al. (1996), Manini (1999), Malone (1999), Stroobants (2001) prepared vacuum insulation panels with polymer as the core material, but the core material has four disadvantages: 1) High vacuum degree requirement; 2 ) foaming agent is not good for the environment; 3) flammable; 4) it is difficult to achieve high foaming porosity

In 2005, IEA / ECBCS Annex39 conducted research on vacuum insulation panels with fumed silica as the core material. Although the thermal conductivity of the vacuum insulation panel can reach 4mW / m K, its high price limits its wide application. sex