SU1636389A1 - Composition for manufacturing heat resistant materials - Google Patents

Abstract

This invention relates to heat-resistant materials for thermal insulation and linings of high-temperature aggregates. In order to increase strength, reduce fire shrinkage and thermal conductivity, the composition for the manufacture of heat-resistant materials contains the following components, wt%: multiliticarmonic fiber 59.3-78.5; potassium stearate 0.5-0.7; methylamine silicate aqueous solution (in terms of SiOg) 21-40. With a bulk density of 350–600 t / m3, the strength of the products after firing is 0.9–1.8 MPa, fire shrinkage 0.9–1.1%, thermal conductivity at 60) C = 0.09–0.16 W / m. K, at 1000 ° C 0.18-0.20 W / mK. 1 tab. with S (I

Description

The invention relates to building materials, namely, heat-resistant, used for linings of high-temperature and per-phase units, as well as for thermal insulation.

The purpose of the invention is to increase strength, reduce fire shrinkage and heat conductivity.

To make a refractory material, the methylamine silicate solution, together with potassium stearate, is stirred to obtain a fine foam mass at a speed of 640-900 rpm for 1.5-2.5 minutes. Add a fiber: fiber and mix for an additional 2.5-3.5 minutes. Then the articles are molded by the method of pressing under pressure of 0.01-0.0 MPa and dried at 200 ° C for

5 hours to obtain 2% moisture. Then burned at 1050 ° C for 4 h, the size of products 100x200x500 mm.

An aqueous solution of methylamine silicate is a binder. Chemical composition , %; Si02 10; CH3SH2 2-5; water - the rest. The degree of polymerization is 70-90, the stability is absolutely stable. It is made with stirring.

water, silicic acid and methylamine aqueous solution (25%).

 Potassium stearate is an alkaline foaming agent. Chemical composition: СН3 (СНг) fgCOOK. - Fiber - Mullite Silica

cotton wool.

In the proposed solution of methylamine silicate, silicate particles are formed

with oo oo

00 WITH

This structure is fine and stable: - due to their lower molecular weight, which leads to a decrease in thermal conductivity and a relative density. In this case, a uniform distribution of fine SiO particles on the surface of the fibers leads to a high homogeneity of the material and an increase in strength after drying.

The proposed composition allows reaching the target by forming a finite, finely porous fibrous structure with uniformly distributed silica on the fiber surface, which is achieved due to the low degree of polymerization (70-90) of the aqueous solution of methylamine silicate and its absolute stability.

The compositions and their properties are presented in the table. Application temperature 1200 ° C.

31636389

Claims (1)

The invention claims that as a silica-containing binder is an aqueous solution of methyl silicate. Composition for the manufacture of a heat resistant amine in the following ratio of com plex materials, including mullite. ponentov, wt.%: silica fiber and silica-Mullite-silica containing binder, distinguishing fiber -59.3-78.5 u and with the fact that, in order to increase the strength of the water and decrease the methylamine firewall shrinkage and thermal conductivity, it additionally contains (in terms of Si02) 21-40 potassium stearate and, in potassium stearate 0,