Mullite light insulating brick and preparation method thereof

Abstract

The invention relates to a mullite light insulating brick and a preparation method thereof. The technical scheme is as follows: the preparation method comprises the following steps of: by taking the following components by weight percent as raw materials: 30-40 wt% of a flint clay clinker, 20-30wt% of a clay clinker, 20-32wt% of kyanite micro-powder, 2-8 wt% of p-aluminum oxide micro-powder, 1-6wt% of light-burnt calcium oxide and 0.5-2wt% of silicon dioxide micro-powder, adding 20wt% of water and 0.5-2wt% of a water reducing agent, mixing and preparing a slurry; then, adding 0.1-0.5wt% of a foaming agent to prepare foams, stirring, adding 0.5-2 wt% of a gel, 0.1-1wt% of a thermosetting water-soluble high molecular compound and 0.5-2.5wt% of an accelerating agent, stirring, pouring, and molding; and finally, drying for 4-9 hours in a temperature of 30-50 DEG C, demolding, baking for 10-20 hours in a temperature of 60-120 DEG C, and preserving a temperature of 1350-1500 DEG C for 2-12 hours to obtain the mullite light insulating brick. The preparation method is short in de-molding time, short in drying period and environment-friendly; and the product is small in air hole size, uniform in air hole distribution, high in strength, low in volume density and low in heat conductivity coefficient.

Description

technical field [0001] The invention belongs to the technical field of lightweight heat-insulating refractory materials, and in particular relates to a lightweight mullite heat-insulating brick and a preparation method thereof. Background technique [0002] In view of the current situation of excessive energy consumption in my country and even the world, the research on thermal insulation and energy-saving materials is particularly important. Thermal insulation is one of the important measures for energy conservation. Thermal insulation materials with micro-nano pores have a series of excellent properties such as light weight and low thermal conductivity, and play an important role in the field of thermal insulation. [0003] At present, the methods for preparing porous lightweight insulation materials mainly include burn-off addition method, sol-gel method, gas generation method, self-propagating high-temperature synthesis method, gel injection molding method and porous raw...

AI Technical Summary

Problems solved by technology

Most of these methods are prepared with open pores, and their application range is limited. It is difficult to achieve a good thermal insulation effect in lightweight heat insulating materials, and the cost is high during the preparation process, which pollutes the environment and is not easy to control; such as "a A new formula of mullite lightweight thermal insulation brick" (CN101362651A) patented technology, using EPS poly light balls and sawdust to prepare mullite lightweight heat insulation bricks, the production process is more complicated, EPS poly light balls produce The stomata are unstable, and the stomata produced by sawdust are large and difficult to control and pollute the environment

[0004] The pore size distribution of the product obtained by the foam method is uniform, the size is easy to control, and the product is mostly closed pores, but the drying and demoulding time is long, and the stability of the foam restricts the performance of the product; Lightweight bricks as raw materials and their preparation methods” (CN101717267A) patented technology, the mullite lightweight bricks prepared by the foam method can only be demoulded after being dried at 100~120°C, and the demoulding time is very long