RU2497772C1 - Composition for decoration - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to building materials and can be applied for decoration of concrete, plastered surfaces. Composition for decoration, includes powdered lime, mineral filler and water, in which mineral filler is obtained by sedimentation from liquid glass with silicate module 2.9 introducing 30% solution of calcium chloride with further milling of dried sediment to size of particles 90-100 nm, and it is additionally contains quartz sand with particle size to 0.315 mm and fineness module 1.7, super-plasticiser C-3 and zinc stearate with the following component ratio, wt %: powdered lime 15.0-20.0; said quartz sand 55-64; said filler 4.8-7.0; super-plasticiser C-3 0.1-0.13; zinc stearate 0.64-0.72; water - the remaining part.

EFFECT: increase of water resistance and reduction of water absorption and hygroscopicity of lime coatings.

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Description

The invention relates to compositions used for finishing concrete and plaster surfaces.

Known compositions containing cement, lime dough, calcium chloride, iron minium (and.with. No. 666146 C04B 28/18).

The disadvantage of these compositions are low adhesion, strength, surface staining of coatings based on colorful compositions.

Closest to the invention is a composition for decoration (RF patent No. 2417964), including fluff lime, filler, water. As a filler, the composition contains colored powders obtained by precipitation from water glass with the addition of a precipitating agent and chromoform (copper sulfate CuSO ₄ and iron chloride FeCl ₃ ). The colored powders consist of calcium hydrosilicates, hydrated silica, hydrophosphates of chromophore metals of 90-100 nm in size, interacting with lime, which increases the strength of the lime coating.

However, coatings made from this composition have increased hygroscopicity and insufficient water resistance, which limits their use in the decoration of facades of buildings and structures.

The aim of the invention is to increase the water resistance of coatings.

This goal is achieved by the fact that in the composition for finishing, including lime powder, filler and water, an additional mineral filler based on calcium hydrosilicates, quartz sand with a particle size of up to 0.315 mm and a particle size of 1.7, and a complex of modifiers, consisting of superplasticizer C-3 and zinc stearate, in the following ratio of components, wt.%:

Lime fluff - 15.0-20.0;

Quartz sand - 55-64;

Mineral filler based on calcium hydrosilicates - 4.8-7.0;

Superplatifier C-3 - 0.1-0.13;

Zinc stearate 0.64-0.72;

Water is the rest.

As a binder, ensuring the strength of the coating and its decorative characteristics, we used building lime with an activity of 71-90%, which meets the requirements of GOST 9179-77.

As a fine aggregate, which reduces internal stresses in the coating and increases its crack resistance, quartz sand with grain sizes up to 0.315 mm with a true density of 2611 kg / m ³ , a particle size modulus of 1.7, and a bulk density of 1490 kg / m ^{3 were used} .

A powder containing nanosized calcium hydrosilicates was used as a mineral filler exhibiting hydraulic activity. The mineral filler was synthesized by precipitation of liquid sodium glass with a silicate module (M = 2.9) and density (ρ = 1663 kg / m) with a 30% solution of calcium chloride (TU 6-09-4711-81). The precipitate formed with constant stirring was filtered off, dried at a temperature of 105-300 ° С and crushed in a ball mill for 30 minutes. at a speed of rotation of 500 rpm. Implementation of the indicated technology for the synthesis of mineral filler provides the production of nanosized calcium hydrosilicates (size 90-100 nm) with increased hydraulic activity, which increases contact strength at the phase boundary, physical and mechanical and operational properties of lime coatings.

To reduce the water demand of the raw material mixture with the required mobility, C-3 superplasticizer was used according to TU 5745-004-43184789-05, with a content of polymethylene naphthalenesulfonates of at least 80 wt.%, Sodium sulfate of at least 7 wt.%, Technical lignosulfonates of not more than 10 wt. .%.

Zinc stearate according to TU 6-09-17-279-90 was used to increase the hydrophobicity of calcareous coatings, reduce water absorption and hygroscopicity, as well as increase the water resistance of coatings.

The preparation of the composition for decoration is as follows. Construction lime, mineral filler, silica sand and a complex of modifiers consisting of superplasticizer C-3 and zinc stearate are loaded into a mixer of any type, thoroughly mixed for 10 minutes. Then add a metered amount of tap water (GOST 23732-85) and mix thoroughly until a homogeneous mixture is obtained. The resulting mixture is used for finishing walling of buildings and structures.

The formulations of the proposed composition for decoration are given in table 1, and the properties of lime coatings are given in table 2.

As follows from table 2, the proposed compositions with comparable indicators of physical and mechanical properties have increased water resistance, which allows them to be used in the decoration of facades of buildings and structures.

Table 1 Name of ingredients Compositions, wt.% I II III IV V prototype Lime Fluff fifteen 16 eighteen 19 17 45 Quartz sand with grain size up to 0.315 mm 58 63.3 60 55 64 Mineral filler on basis hydrosilicate calcium 7 4.8 6 5.5 5 10 Super platifier S-3 0.1 0.1 0.13 0.13 0.12 Zinc stearate 0.64 0.7 0.67 0.64 0.69 Water 19.25 15.1 15,2 19.73 13.19 45

table 2 The name of indicators Compositions I II III IV V prototype Drying time, min: - to degree 3 fifteen 10 12 eleven fourteen 10 - to degree 5 25 fifteen eighteen twenty 22 twenty Adhesion, MPa 1,2 1.4 0.9 1,1 1.3 1.4 Compression strength at the age of 28 days, MPa 3.8 5,4 3.6 4.1 3,5 4.8 Water retention capacity,% 98 98.3 98 98.1 98 Water resistance (softening coefficient K _size ) 0.75 0.78 0.73 0.76 0.74 0.51 Appearance Quality Class VI VI

Claims (1)

The composition for finishing, including lime powder, mineral filler and water, characterized in that the mineral filler is obtained by precipitation from water glass with a silicate module 2.9 by introducing a 30% solution of calcium chloride, followed by grinding the dried precipitate to a particle size of 90-100 nm and additionally contains quartz sand with a particle size of up to 0.315 mm and a particle size modulus of 1.7, superplasticizer C-3 and zinc stearate in the following ratio of components, wt.%:
Lime Fluff 15.0-20.0 Specified Quartz Sand 55-64 Specified Filler 4.8-7.0 Superplasticizer S-3 0.1-0.13 Zinc stearate 0.64-0.72 Water Rest