RU2568446C1 - Liquid-glass composition - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: liquid-glass composition for gluing building products, includes sodium liquid glass, 30-50% solution of sodium hydroxide, low-calcium TPP fly ash, antifreeze additive and gypsum binding agent and water, Portland cement, modified by plasma-chemical procession, quartz sand, modified by plasma-chemical procession with the following component ratio, wt %: sodium liquid glass - 19-23; 30-50% water solution of sodium hydroxide - 3-4.6; modified Portland cement - 16-24; low calcium fly ash - 29-33; modified quartz sand - 9.5-16; antifreeze additive - 2.8-5; gypsum binding agent - 0.5-0.7; water - the remaining part.

EFFECT: increase of adhesion strength and water resistance.

2 tbl, 1 ex

Description

The invention relates to construction production and can be used for gluing and repairing structures of heavy, light and cellular concrete, brick, upon receipt of binders for composites of reduced fire hazard.

Known polymer silicate composition for building products, including, by weight. %: water glass 10.2-12.0, sodium silicofluoride 1.5-2.3, furyl alcohol 0.42-0.5, phenol-formaldehyde resin 0.18-0.22, quartz sand 20-21, the mixture is 2-5 wt. including 50% aqueous solution of NCl and 95-98 wt. including a 50% solution of Na ₃ PO ₄ 0.6-1.48, acid-resistant crushed stone - the rest (ed. certificate SU No. 1133243, class 04B 28/26, 01/07/1985).

Known adhesive composition for building products, including, by weight. %: Portland cement 10-20, trisodium phosphate 1-2, ground silicate block 10-20, expanded clay sand 8-39, liquid glass - the rest (ed. certificate SU No. 1102784, class С04В 28/26, 07/15/1984 )

The closest analogue is a liquid glass composition for building products, including, by weight. %: sodium liquid glass 19-23, 30-50% aqueous solution of sodium hydroxide 3-4.6, Portland cement 16-24, low-calcium fly ash 29-33, aggregate - fine-grained quartz sand 9.5-16.0 , antifrosty additive 2.8-5.0, gypsum binder 0.5-0.7, water - the rest (patent RU No. 2199502, С04В 28/26, 02.27.2003).

A disadvantage of the known compositions is the low adhesive strength.

The technical result is an increase in adhesive strength and water resistance of the liquid glass composition.

The technical result is achieved in that the liquid glass composition, including sodium liquid glass, 30-50% aqueous sodium hydroxide solution, Portland cement, low-calcium fly ash, aggregate - fine-grained quartz sand, antifreeze additive, gypsum binder and water, contains a modified plasma chemical processing Portland cement and modified by plasma-chemical processing fine-grained quartz sand with Mkr = 1.25, and as a gypsum binder - two-water gypsum in the following ratio nents wt. %:

sodium liquid glass 19-23 30-50% aqueous sodium hydroxide solution 3-4,6 specified portland cement 16-24 low calcium fly ash 29-33 specified fine quartz sand 9.5-16 antifrosty additive 2.8-5 gypsum plaster 0.5-0.7 water rest

Modification of Portland cement and fine sand was carried out separately in a nonequilibrium low-temperature plasma generator with plasma characteristics: temperature T _PL = 5 · 10 ⁴ K, density n _e = 10 ¹⁸ cm ^-3 and particle motion energy T _e = 4-5 eV.

To prepare a liquid-glass composition, salable liquid glass (GOST 13078-81) with a density of 1360-1520 kg / m ³ and a silicate module of 2.65-3.5 was used.

To slow down the setting time of liquid glass and bring its silicate module (1.6-2.4) to a working value, the composition contains sodium hydroxide (GOST 2263-79), introduced into liquid glass in the form of a 30-50% aqueous solution.

As a hardener, the composition contains a modified Portland cement M500, as a filler - a modified fine-grained quartz sand with MKR = 1.25, low-base fly ash (GOST 4233-86), as an antifreeze additive, the composition may contain sodium chloride (GOST 4233-77 ), carbamide (urea), sodium nitrite (GOST 19906-74), and two-water gypsum as a regulator of setting Portland cement (GOST 4013-82).

The proposed liquid glass composition has a high adhesive strength, as well as high water resistance.

Example.

The liquid-glass composition is prepared from the starting components in the form of a dry mixture and a liquid component (water glass, 30% aqueous sodium hydroxide solution, sodium chloride and water). Previously, Portland cement and quartz sand are subjected to plasmochemical modification. The estimated amount of the dry mixture, consisting of modified Portland cement, modified fine-grained quartz sand with MKR = 1.25, low-calcium fly ash and two-water gypsum, and the liquid component are loaded into a standard bowl and mixed thoroughly. From the obtained liquid-glass composition, beam samples 40 × 40 × 160 mm in size are formed, which after 28 days. experiencing bending and compression. Adhesive strength is determined on a RMI-5 device.

To determine the water resistance, cubes with a side of 50 mm are formed from the obtained composition. Samples of 3 days harden in air, then 25 days in water.

Table No. 1 shows the compositions of the liquid glass composition. Table No. 2 shows the characteristics of samples obtained from the claimed liquid glass composition.

Claims (1)

A liquid-glass composition for bonding building products, including sodium liquid glass, 30-50% sodium hydroxide solution, low-calcium fly ash of TPPs, antifreeze additive, gypsum binder and water, characterized in that it contains Portland cement modified by plasma-chemical treatment as a hardener, silica sand modified by plasma-chemical processing as a filler in the following ratio of components, mass. %:
Sodium water glass - 19-23;
30-50% aqueous sodium hydroxide solution - 3-4.6;
Modified Portland cement - 16-24;
Low calcium fly ash - 29-33;
Modified quartz sand - 9.5-16;
Antifrosty supplement - 2.8-5;
Gypsum binder - 0.5-0.7;
Water is the rest.