SU1397418A1 - Method of water-repellency treatment of expanded clay aggregate - Google Patents

Abstract

The invention relates to the production of building materials and can be used to hydrophoize the expanded clay obtained by firing in a rotary kiln. To reduce water absorption, the clay granules heated at 110-170 ° C are treated first with an aerosol of sodium methyl or ethyl silicate and then with the residual product of thermal decomposition of coal, and the cooling is carried out in water. The processed clay with a density of 400 kg / m is characterized by water absorption for 24 hours 0.04-0.09%, and after 7 days of testing in water - 0.10-0.23%. 1 tab. i (L

Description

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The invention relates to the production of building materials and may be used to hydrophobize expanded clay obtained by firing in a rotary kiln.

The purpose of the invention is to reduce water absorption.

The method of hydrophobicizing claydite involves treating the granules with methyl or ethyl silicate sodium, heated with the granules of claydite, and then the residual product of thermal decomposition of coal, the cooling being carried out in water, the residual product of thermal decomposition of COAL includes heavy resin and neutral oils separated from light resin. To hydrophobize claydite, a mixture of neutral oils and heavy resin is used in a ratio of ma.h 0.3: 1.0. Products are obtained at a pilot industrial plant in the processing of brown coal and are characterized by the following desirable properties.

Characteristics of neutral oils (liquid product): density 0.877-0.960 g / cm, iodine number (g iodine per 100 g) 14.3-18.0; content,%: carbon 86.2-87.0: hydrogen 9 , 9-11,4; oxygen 2.2-3.1; srezdn mol.

310-419.

Heavy resin characteristic

(solid): density 1.0-1.3 g / cm, softening temperature

50-90 ° C; elemental composition%: carbon 79-80; hydrogen 5., 8-6,4; sulfur 0.13-0.40; nitrogen 0.8-1.1; the content of the main components,%: asphaltenes 41-80, carboids 6-15, the rest of the ash, mechanical impurities,

As methyl-1; of ethylsilicone and sodium sodium, silicone liquid of the NGL-11 grade or

 NGL-10,

i Example Clay gravel in a rotating drum is heated to 110-170 ° C or used after a kiln with this temperature, then during rotation of the drum through the central face hole for 5 minutes with a spray gun, 1% solution of GKZH-11 is injected with a spray bottle; after purging, the volume of the drum with air is inserted into the same opening by a chute with a perforated bottom for even distribution

5 0 5

0

P

five

five

0

five

nor the length of the drum pour liquid mixture. A heated fluidized mixture of heavy and light resin, a product of the thermochemical destruction of brown coal, is introduced into the rotating drum through a groove in a rotating drum. After 20-30 minutes of mixing, the drum is stopped, the contents of the drum are cooled by air blowing and at 60-80 seconds, the treated clay is poured into cold water to prevent the grains from sticking to each other. Treated expanded clay gravel has an equal, semi-gloss black coating.

Examples of the proposed method and the properties of the processed filler compared with the known are presented in the table.

Aerosol treatment of aqueous hydrophobic preparations from NGL ensures uniform processing of the entire effective surface of claydite and chemical fixation of hydrophobic substances on a silicate substrate, changing the properties of the surface layer at the molecular level, its modification with an organic substance, which contributes to the adhesion of the main film-forming substance - a mixture heavy and light resin.

Reducing the moisture absorption of the claydite ensures the preservation of stable thermal and hydroisolation properties. The treated clay (gravel and sand) can be used as a bulk insulation material in conditions of excessive moisture and for the preparation of asphalt ceramite concrete.

Claims (1)

Invention Formula Method hydrophobization expanded clay by treating the heated expanded clay granules organosilicate composition and subsequent cooling, characterized in that, in order to reduce water absorption, expanded clay pellets are heated to 110 to 170 and treated with methyl or aerosol initially etilsilikonata solution and then the residual product of thermal decomposition of coal, and cooling is carried out in water. Heating temperature of expanded clay granules, PC Processing of granules of expanded clay aerosol: sodium methylsiliconate (GKZH-P) sodium ethylsiliconate (GKZH-S) Subsequent processing of expanded clay granules residual product of thermal decomposition of coal (resin) Cooling of treated granules Characteristics of the treated claydite fraction 5-20 mm with a bulk density of 400 kg / cm: water absorption in 24 hours,% water absorption after testing in water for 7 days,% BY 140 170,100 Processing granules organo-silicate position Water Water Water Natural 0.06 0.04 0.09 1.45 0.12 0.10 0.23 3.3