SU1240748A1 - Raw mixture for producing heat-protecting coating - Google Patents

Description

The invention relates to building materials and is intended for the manufacture of a heat-shielding coating with an application temperature of up.

The purpose of the invention is to increase the adhesion strength, decrease the thermal conductivity and toxicity in the working area when applying the coating on a hot surface.

Example 1. In a mixer, 35% by weight of asbestos is mixed with 20% by weight of tailings for the production of concentrated phosphate fertilizers. The resulting mixture is applied to the insulated surface using a spraying unit of a UNOP-III design, and at the exit of the gun-gun. dry the mixture is moistened with 45 wt.% liquid glass.

Example 2. In the mixer mix 53.5 wt.% Asbestos with 11.5 wt.% Tailings production of concentrated phosphate fertilizers. The resulting mixture is applied to an insulated surface, and a dry mixture is moistened with 35% by weight of liquid glass at the exit of the spray gun.

Example 3. In a mixer, 72 wt.% Of asbestos is mixed with 3 wt.% Of tailings for the production of concentrated phosphate fertilizers. The resulting mixture is applied to an insulated surface, and at the outlet of the spray gun, the dry mixture is moistened with 25% by weight of water glass.

The tails of the production of concentrated phosphate fertilizers are a fine product.

Tensile strength at stretching perpendicular to the formation, kgf / cm at

on metal at, С 100

150

240748I

consisting of dihydrate gypsum, phosphoric acid in soluble and bound states, and a small amount of uncomposed portions of phosphorus forite.

When used as a filler for asbestos and additionally tailings for the production of concentrated phosphate fertilizers, contact with a hot surface does not instantly cure the coating. Since the constituent of the tails is double; gypsum under the action of temperature and in the presence of bound phosphoric acid goes into semi-aqueous by the following chemical reaction:

ten

CaSO.

f ° g

7U P .KgU

CaSO. 0.5 N, 0 + kktx})

+ n-H.O-Q,

The presence of bound phosphoric acid in the mixture determines the thermal character of this reaction and shifts the reaction to the right, which leads to a significant decrease in temperature at the boundary between the hot surface and the heat shield.

The test results are shown in the table.

As can be seen from the proposed table, the use of this raw material mixture will increase the adhesion of heat. Lozash 1: Good coating to various materials, reduce the coefficient of thermal conductivity and improve working conditions.

1.1

1, 1 1.1

0.90 0.81

0.90 0.80 0.90 0.81

on concrete at WITH

20

100

150 bricks at, with

20

100

150

Flexural strength, kgf / cm (when tested at 150 ° C)

Compressive strength, kgf / cm (when tested at 150 ° C)

The limit of n) accuracy at

stratification, kgf / cm

(when tested at

Heat conductivity coefficient, W / m.K

Excretion of harmful substances

Table continuation

1.18

1.17

1.18

1.16

1.16

1.15

3.2

6.9

0.3

0, 079

ten

1.1 1.0

0.94 0.93 0.94

2.9 6.4

0.89 0.90 0.90

0.85 0.85 0.84

2.7 6.1

0.26 0.21 0.07 0.06

Claims (1)

RAW MATERIAL MIXTURE FOR THE PRODUCTION OF HEAT PROTECTIVE COATING, containing asbestos and liquid glass, characterized in that, in order to increase the adhesion strength, reduce the thermal conductivity and toxicity in the working area when applied to a hot surface, it additionally contains tailings for the production of concentrated phosphorus fertilizers when applied the corresponding ratio of components, May.%: Asbestos 35-72 Liquid glass 25-45 Tailings of production of concentrated phosphorus fertilizers 3-20