RU1396511C - Method of obtaining raw mixture for manufacture of heat-insulating material - Google Patents

Abstract

The invention relates to the field of production of thermal insulation materials for urban and industrial construction. The purpose of the invention is to increase compressive strength, reduce fire hazard. Upon receipt of the raw material mixture for the manufacture of insulating material bodies, first the granules of the foaming volystyrene 20-30 wt.h are mixed with an aqueous solution of sodium silicate 16 24 wt., Then with a finely ground silicate g / n fight 100 wt. 18-20 wt.h, pore former 5-10 maach and mineral filler 8-16 wt. - and mixed, sodium silica powder before feed can be moistened up to 15%. Thermal insulation products with a bulk mass of 150 - 166 150-166 kg / m are characterized by strength at rounded 3.0 - 3.4 3JD-3.4 kgf / cm, moisture absorption in 24 hours 0.3 - 0.4% vol., Water absorption in 24 hours 3 , 0 - 32% vol .: thermal conductivity 0.05 W / m K, combustibility 3.1 - 4.3% (weight loss on the fire tube), combustibility according to the Km 28 - 0.36 method, moisture content 10 - 12%, tensile strength at break 0.7 - 0.8 0.7-0.8 kgf / cm. 2 tab.

Description

The invention relates to the production of thermal insulation materials based on polystyrene foam and inorganic binders intended for the production of thermal insulation products for civil and industrial construction.

The aim of the invention is to increase the compressive strength, reduce fire hazard and water absorption.

The invention is illustrated by the specific raw mixes given in Table 8. 1.

The raw material mixture is prepared as follows.

The expandable polystyrene is thoroughly mixed with an aqueous solution of sodium silicate with a density of 1.3-1.5 g / cm, then a finely ground silicate block is introduced and mixed, it is necessary to ensure that all granules are covered first with liquid glass and then with fine silicate powder on three . Under stirring, a mineral filler (perlite, fibrous zsbest), a pore former and sodium silicofluoride are added to the resulting mixture. The resulting mixture is loaded into a foaming mold into which 100

0

5

0

5

% saturated steam with a temperature of 95-98 ° C for 25 minutes Then the product is removed from the mold. Sodium silicofluoride can be moistened up to 15% before administration.

Physico-technical indicators of products from specific compositions of raw mixes are shown in table. 2.

Finished products have a fairly rigid closed mesh structure. On the cut of a sample of such a product, the uniform boundaries between glass and polystyrene granules are visible no more than 1-2 pieces in a cured glass cell, which leads, on the one hand, to an increase in the internal adhesion forces of components with different physicochemical properties, and on the other parties - to a uniform distribution of external loads on the samples. Due to the absence of accumulations in a certain volume of polystyrene or hardened glass granules, as well as a closed cellular structure, water absorption indicators are also improved.

(56) Copyright certificate of the USSR NS 272879. cl. From 04 to 38/08. 1967.

USSR copyright certificate, No. 1282468, cl. S 04B 38/02, 1985,

NOTE In Examples 7, 8, and 10, the moisture content of sodium cremifluoride is 15%. In Example 9, the moisture content of sodium silicofluoride was 7.5%.

thirty

Table 1

table 2

Continuation of the table. 2

 Formulas a and 3 on the strain

A method of producing a raw material mixture for the manufacture of a heat insulating material, comprising mixing finely ground silicate block of 100 parts by weight, sodium silicofluoride of 18-20 parts by weight, a burner of 5-10 parts by weight, of a mineral filler of 8-16 parts by weight. hours and expandable polystyrene a 20-30 parts by weight, mixture loading

Continuation of the table. 2

10

into a mold and subsequent foaming, characterized in that, in order to increase the compressive strength, reduce fire hazard and water absorption, the granules of the expanding polystyrene are first mixed with 16-24 parts by weight. an aqueous solution of sodium silicate with a density of 1.3-1.5 g / cm, then a finely ground silicate block is introduced, after which the rest of the compo are added and mixed.