A light-weight thermal insulation material containing silica micropowder

Abstract

The invention belongs to the technical field of refractory materials and mainly relates to a lightweight thermal-insulting material containing silicon oxide micro powder. The lightweight thermal-insulting material containing the silicon oxide micro powder, provided by the invention, consists of a solid raw material and a liquid raw material; the total mass percentage of the solid raw material is 100 percent, and the solid raw material specifically consists of 1-85 percent by weight of silicon oxide micro powder, 0-80 percent by weight of gas phase white carbon black, 5-25 percent by weight of refractory fibers, 2-20 percent by weight of a foaming agent and 0.1-10 percent by weight of acid; the liquid raw material consists of a silica sol and water and occupies 40-300 percent of the total mass percentage of the solid raw material; the silica sol is an industrial-grade silica sol, and the content of silicon oxide is 28-30 percent. The lightweight thermal-insulting material provided by the invention has the benefits that the purpose of controlling the material thermal conductivity is achieved; the service life of equipment is prolonged.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and mainly relates to a lightweight heat insulating material containing silicon oxide micropowder. Background technique [0002] Due to its high porosity, small bulk density and thermal insulation properties, lightweight heat insulation materials are widely used in various industrial kilns as thermal insulation linings between refractory bricks and steel shells to obtain good energy-saving effects and high energy utilization rate. Commonly used lightweight insulation materials have a bulk density of 0.5 to 1.5 g / cm 3 , for bulk densities less than 0.5 g / cm 3 Ultra-lightweight insulation material suitable for manufacture in the following ways: [0003] 1) Filler burning method, filling some combustibles or volatile substances into the slurry, and using the method of burning off the filler at high temperature to make the material porous. The advantage is that the pore size and poro...

AI Technical Summary

Problems solved by technology

The disadvantages are: low strength, uneven distribution of pores, and environmental pollution during the production process

The disadvantages are: the high temperature strength is low, the material used in castables is easy to delaminate, and the shrinkage line changes greatly; it needs to be fired twice when used in refractory bricks, which is costly and not conducive to handling

The disadvantages are: complex process, high cost, and most of the pores are obvious pores or through holes

Disadvantages are: most of the pores are through holes, the scope of use is narrow, and they are mostly used to filter gases and impurities

Disadvantages are: the stability of the foam is poor, the drying shrinkage line changes greatly, and it is difficult to control

The disadvantages are: the curing time is long, the speed of foaming is not easy to control, resulting in a large change in the bulk density of the material

The disadvantage is: the cost of the material is high, and the fiber is easy to crystallize, and the stability is poor

Since lightweight insulation materials are porous materials, a large amount of liquid is required to participate in the mixing process, especially for ultra-light insulation materials with low volume density, which are easy to crack during the drying process, so supercritical drying is generally used process, but this process is complicated and the production cost is high, which is not conducive to large-scale production and application

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