RU1781188C - Polymeric cement composition - Google Patents

Abstract

Usage: building materials industry. SUMMARY OF THE INVENTION: a polymer-cement composition contains, wt.%: Cement 46-75; polyethylene emulsion (in terms of 100% dry matter) 1.5-8.0; sodium silicate 0.5-2.5; water the rest. The tensile strength of the polymer-cement composition on a textile basis at the age of 7 days amounted to 1150 N. 4 tab.

Description

The invention relates to impregnating compositions used in the manufacture of protective coating materials on textile substrates for thermal insulation of pipelines.

A known composition / including (in parts) 1,0 hydraulic cement, 1,0 polyethylene, 1,0 water and 2,0 aggregate-vermiculite.

The closest in their technical essence and the achieved positive effect is the polymer-cement composition, including cement, water and polymer additives in the form of aqueous dispersions of polymers used for the manufacture of textile-based protective coating materials for thermal insulation of pipelines.

The disadvantage of the polymer-cement composition is the duration of the process of hardening, which is 7-8 days.

The aim of the invention is to reduce the hardening time.

This is achieved in that the polymer-cement composition, including cement, polymer emulsion, and water, contains as a polymer emulsion a polyethylene emulsion - sodium silicate, in the following ratio of components, wt.%: Cement46-75

Polyethylene emulsion (in terms of 100% dry matter) 1.5-8.0

Sodium silicate 0.5-2.5

Water Else

The laid impregnating half-cement composition is prepared as follows: water (2/3 parts of the calculated amount) is fed into the mixer with a volume of 0.6 m3, after which the required amount of cement (alumina or Portland cement) is fed from the measuring hopper and mixed until a homogeneous mass. Then sequentially

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with stirring, the calculated amount of polyethylene emulsion and sodium silicate, previously diluted with water in a ratio of 1: 1, is added. The composition is stirred until it is fully developed. The prepared composition of 85.5% concentration is fed by gravity into the bath, where, by the method of complete impregnation, up to 100% wet weight is applied to a textile base, which is a glued non-woven fabric with a surface density of 100 g / m2. A cloth impregnated with a composition using Portland cement is kept in a humid environment at a relative humidity of up to 80%, and a cloth impregnated with a composition using alumina cement is kept in cold water.

For the preparation of the polymer-cement composition and the manufacture of protective-roofing materials, the raw materials shown in Table 1 are used. 1.

The invention is illustrated by examples 1-8, presented in table. 2.

Example 1-3 describes a polymer-cement composition of the prototype.

Examples 4-6 characterize a polymer-cement composition using extreme and average component values in accordance with the claims.

Examples 7-8 characterize a polymer-cement composition with exorbitant component values.

In the table. 3 shows the curing time of polymer cement compositions according to

measures 1-8 on a textile basis - art.935508 glued fabric and changes in the strength of the impregnated base over time.

The curing time is determined by the time after which the strength of the impregnated base remains unchanged.

In the table. 4 shows the physicochemical parameters of protective coating materials impregnated with polymer-cement compositions according to examples 1-8 (examples 1-3 prototype).

An analysis of the physical and mechanical properties of textile-based protective coating materials according to Examples 1-8 is carried out according to GOST;

- tensile strength, flexibility in accordance with GOST2678-81 Roll roofing and waterproofing materials.

Claims (1)

The claims A polymer-cement composition for impregnating textile insulation of thermal pipelines, including cement, a polymer emulsion and water, characterized in that, in order to reduce the hardening time, it contains a polyethylene emulsion and additional sodium silicate as a polymer emulsion in the following ratio of components, wt.% : Cement46-75 Polyethylene emulsions (per dry matter) 1.5-8.0 Sodium silicate 0.5-2.5 Water Else. Material Alumina cement grade 500 Portland cement grade 400 Dispersion aqueous vinyl chloride with vinyl acetate / A-25 / Dispersion aqueous vinyl chloride with vinylidene chloride / TSW - P / Butadiene styrene aqueous dispersion / SKS-65 GP-B / Polyethylene emulsion Sodium Silicate Glued Nonwoven Table 1 Technical documentation / GOST. OST.TU / GOST 969-77 GOST 10178-85 TU 6-01 - 1181 -79ism. 1,2,3 TU 6-02 - 562 - 75 rev. 1,2,3 TU-38,103111-72 rev. 1,2,3 TU 6-05-1115-77 rev. 1,2,3 TU 6-05-1115-77 rev. 1.2 GOST 25441-82 Alumina cement - 60.0 - 46 Portland cement 50.0 - 70.0 Dispersion of aqueous vinyl chloride with vinyl acetate (A-25) 2.5 Dispersion of native vinyl chloride with vinylidene chloride (SVX-P) - - 7.0 Butadiene styrene water dispersion (SKS-65GP) - 5.0 Polyethylene emulsion - - - 1.5 Sodium silicate - - - 0.5 Water47.5 35.0 23.0 52.0 m ---- ""., The polymer additives included in the formulation of the impregnating compositions are presented in 100% dry matter Tal "ca2 75 thirty 80 60.5 8.0 1.0 2.5 0.3 14.5 68.7 10.0 zo 7.0 Table3 Table a