SU948958A1 - Raw mix for making heat insulating products - Google Patents

Description

(5kJ RAW MATERIAL MIXTES FOR THE MANUFACTURE OF HEAT-INSULATING

PRODUCTS

The invention relates to construction materials and is intended for the manufacture of thermal insulation products used for the lining of thermal units. The known raw material mixture for the manufacture of heat insulating material, comprising 17-28% phosphate binder, 6-22% refractory clay raw material, 2 -3%; chamotte; 16-53% claydite | .ll The disadvantage of this mixture is high apparent density thermal insulation products. Closest to the offer is a raw mix for the manufacture of insulating concrete, comprising 20-50% phosphate binder, 3-50% ot-modification of technical alumina, 25-55% fine technical alumina, 0, dimethylcyclosilazane 2. The disadvantage of this mixture is its apparent apparent density and low heat resistance. The aim of the invention is to reduce the apparent density, increase the heat resistance of thermal insulation products and utilize waste products. This goal is achieved by the fact that the raw mix for the manufacture of thermal insulation products, including phosphate binder, finely ground technical alumina and a pore-forming agent, contains polymethylphenyl cyclosilazane as a pore-forming agent and, additionally, waste production of chamotte lightweight with the following ratio of components, wt.%: Phosphate production, in the following ratio of components, wt.%: Phosphate, in addition to the following ratio of components, wt. Fine ground technical alumina 30-35 Polymethylphenyl cyclosilazane2-5 Waste from chamotte lightweight production Introduction of an organic cyclosilazane oligomer to the recipe Blending the mixture in combination with a phosphate binder leads to a swelling of the concrete mixture, after chemical interaction between these components with release of ammonia. The reaction of the organocyclosilane oligomer with the phosphate moiety is slower than individual organosilazane cycles, because the oligomeric chain is more stable and resistant to chemical reagents due to the increased content of tertiary nitrogen, which is less reactive, and besides, due to the steric effect of the phenolic cores cycle from degradation in an oxidizing environment. The delayed effect of the pore-forming agent in the system is more convenient in the technological process of manufacturing heat-insulating products, since there is no loss of the mixture due to rapid expansion and leakage from the metal forms. The coarse grains of fireclay lightly moistened with a phosphate binder roll fine alumina industrial alumina — this is how a screen is made of refractory powder filler. Such a combination of large-scale inclusions with finely ground refractory filler results in heat-resistant structures, and, consequently, the heat resistance of such products increases significantly. The combination of the introduction of a large porous filler and a pore-forming organocyclo-silane oligomer with a phosphate component into the raw material mixture leads to the formation of heat-insulating products with a reduced apparent density. In addition, the combination of fine technical alumina with the phosphate component i during heat treatment causes additional swelling of the raw mix, which also reduces the apparent density of the products. The use of chamotte lightweight in the composition of the waste mixture makes it possible to solve the problem of production waste disposal, which significantly reduces the cost of manufactured phosphate thermal insulation materials. The chemical composition of chamotte lightweight wastes is the same as that of standard chamotte lightweight produced by domestic enterprises. When more than 25% of waste of chamotte lightweight production is introduced into the composition of the raw mix, the layer of phosphate in the tinder is reduced, consisting of fine technical alumina and phosphate binder, and in some places may be completely absent. Such a breakdown of the structure leads to a deterioration in the thermophysical properties and, in particular, to a decrease in heat resistance and mechanical strength. A reduction in the compositional composition of waste products of chamotte lightweight less than 18 leads to a compaction of the structure of thermal insulation products, which entails the loss of the material, an increase in its apparent density and thermal conductivity. Experimental studies have shown that heat resistance, apparent density and other physical and technical characteristics are provided only by a certain quantitative content of the components in the raw mix, which lie within the specified limits. Example 1. In a pre-prepared mixture consisting of 18 wt. chamotte lightweight waste of 10-20 mm fraction and. 50 wt.% Of an aluminochromophosphate binder, 30 wt. fine ground technical alumina and mix. 2 weight of polymethylphenyl cyclosilazane is added to the mixture. The composition is thoroughly mixed, laid into molds and heat treated, Example 2. In a pre-prepared mixture consisting of 2 wt. waste chamotte lightweight fraction of 10-20 mm and 39 weight, | Phosphoric acid is added 3% weight,% of technical alumina with a specific surface area of at least 8500 and mixed. 3% by weight of polymethylphenyl cyclosilazane is added to the mixture. The composition is thoroughly mixed, placed in a mold and thermoablative. An example of an H-B pre-cooked mixture consisting of 25 wt.%, Waste of chamotte lightweight with a fraction of 10-20 mm and 35 wt. orthophosphoric acid, 35 ppm of technical alumina with a specific surface area of at least 8500 cm / g is injected and measured. 5 wt D of polymethylphenyl cyclosilazane is added to the mixture. The composition is thoroughly mixed, placed in a mold and thermoablative.

The table shows the physicomechanical properties of the heat insulating material of the proposed and known compositions.

Thermal insulation products made from the raw mix of any proposed composition specified in

Alumochromophosphate binder

Technical alumina with a specific

verhnostkz not less than 8500 cm / g

Chamotte lightweight waste fraction

10-20 mm

Polymethylphenylcyclosilazane

Phosphoric acid

Technical alumina with a specific surface area of at least 8500

Chamotte lightweight waste fraction

10-20 mm

Polymethylphenylcyclosilazane

Phosphoric acid

Technical alumina with specific

surface not less than 8500 smHg

Waste lightweight fraction fraction

10-20 mm

Polymethylphenylcyclosilazane

Known composition

Phosphoric acid „

DrNL technical scanty surface not less than 8500

Tonic density of at least 10,000

 .one . .

Octamethyltetracyclosilazane

"89586

examples, have a higher heat resistance and a lower apparent density compared to the prototype. All this makes it possible to significantly expand the scope, improve the efficiency and quality of operation of thermal units.

The estimated annual economic effect from the use of the invention will be 150 thousand rubles. per 10 glass furnaces, which must be insulated during the year.

0.90

12

0.70

15

0.85

12

Claims (1)

1.00 Claims of the invention Raw materials mixture for the manufacture of thermal insulating products, including phosphate binder, finely ground technical alumina, and a porogenizer, characterized in that, in order to reduce the apparent density, to increase the thermal resistance of heat insulating products and disposal. production waste, it contains as porous (polymethylphenyl cyclosilazane binder and additionally chamotte lightweight production waste in the following ratio of components, weight: nr. information taken into account in the examination 1. Author's certificate CttP 108930, class C 04 B 29/02, 197. 2, USSR Author's certificate 78283, class C Qi B 29/02, 1977