RU2550172C2 - Dry filling mixture - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to construction materials and can be used to finish concrete and plastered surfaces. A dry filling mixture, which includes air-slaked lime, filler, plasticising, mineral and polymer additives, contains Kratasol-PFM as the plasticising additive, redispersible Neolith P 4400 powder as the polymer additive, synthetic aluminosilicates as the mineral additive, says aluminosilicates being obtained by mixing water and aluminium sulphate to obtain a solution with pH 4, raising the pH to 8.5-11 by adding sodium silicate while stirring, separating the obtained precipitate, washing the precipitate until obtaining a filtrate with pH 6 and drying the precipitate, and chalk as filler, with the following ratio of components, pts.wt: air-slaked lime 58.9-66.7, filler - chalk 28.2-31.8, mineral additive - synthetic aluminosilicates 5.9-6.7, polymer additive - redispersible Neolith P 4400 powder 0.29-0.31, plasticising additive - Kratasol-PFM 0.57-0.63.

EFFECT: faster hardening of the composition and high water resistance.

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Description

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

Known compositions containing lime dough, ground mineral additive, water (PN Klochanov, AE Surzhanenko, I.Sh. Eidinov. Prescription and technological reference book for finishing work. - M .: Stroyizdat, 1973, p. 40 ) [2].

Also known is a composition containing sodium carboxymethyl cellulose, sodium methylsiliconate, laundry soap, styrene butadiene latex, push lime, polyvinyl chloride (ed. St. 1247364, C04B 26/04).

The closest in technical essence and the achieved result is a composition including sodium salt of carboxymethyl cellulose, fluff lime, aluminum sulfate, sodium hydroxide anhydrous and water glass solution with a density of 1.15-1.17 g / cm ³ (Pat. No. RU 2252204) .

The disadvantages of these compositions are low water resistance and slow curing time of the compositions.

The objective of the invention is to remedy these disadvantages.

The problem is solved in that the dry mixture for puttying, including fluffy lime, filler, plasticizing, polymer, mineral additives, contains Kratasol-PFM as a plasticizing additive, and Neolith P 4400 redispersible powder as a polymer additive, in as a mineral additive - synthesized aluminosilicates, and as a filler - chalk in the following ratio of components, mass. hours:

Lime Fluff 58.9-66.7 Filler (chalk) 28.2-31.8 Mineral supplement (synthesized aluminosilicates) 5.9-6.7 Polymer additive (redispersion powder "Neolith P 4400") 0.29-0.31 Plasticizing additive (Kratasol-PFM) 0.57-0.63

The synthesis technology of aluminosilicates includes the following operations: combining in the mixing zone of water and aluminum sulfate to obtain a solution with a pH of 4.0; increasing the pH of the mixture to a value in the range of 8.5-11 by adding sodium silicate with vigorous stirring; recovering the obtained solid precipitate, followed by washing to obtain pH = 6 (filtrate) and drying the precipitate at a temperature of 100 ° C.

The synthesized aluminosilicates allow you to adjust the structure formation and increase the water resistance of lime compositions.

The preparation of the composition of the dry mix for puttying is as follows. All components of the dry mix are metered and then mixed in any type of mixer.

Specific examples of the compositions and their properties are given in table. fifteen.

The following materials were used to prepare the dry mixture:

slaked lime (fluff) with an activity of 64-67%, a true density of 2230 kg / m ³ _, bulk density of 280 kg / m ³ , with a specific surface of 1000 m ² / kg (GOST 9179-77).

Kratasol PFM additive is a multifunctional additive that meets the requirements of GOST 24211 and belongs to the group of superplasticizers and additives that increase frost resistance. Plasticizing additive Kratasol PFM is a product obtained by multistage organic synthesis and is a copolymer based on sodium polymethylene naphthalenesulfonates with the addition of an air-entraining and hydrophobizing component. The properties of the additive Kratasol PFM are shown in table 2.

Redispersible powder Neolith P 4400 is a copolymer powder based on vinyl acetate and vinyl versatate. It is produced by the spray drying process of a latex dispersion with polyvinyl alcohol as a protective colloid, and it is easily redissolved in water. Delivered to Russia by EuroChem-1. The properties of the redispersible powder Neolith P 4400 are shown in table 3.

In the manufacture of putty chalk grade MM-2 was used (GOST 17498-72). Properties of chalk are shown in table 4.

Water resistance was assessed by the degree of coating chalking (points) after 24 hours exposure in water [3]. The degree of chalking is determined by the nature and degree of pigment freely separated from the surface of the coating by friction with a cloth (for light coatings - black).

Literature

1. Pat. No. RU 2252204 Russian Federation, IPC С04В 28/10. Mix for finishing works / Loganina V.I., Kislitsyna S.N., Makarova L.V., Zakharov O.A .; Applicant and patentee Penza State University of Architecture and Construction. - Publ. 05/20/2005.

2. Klochanov P.N. Prescription and technological reference book for finishing work / P.N. Klochanov, A.E. Surzhanenko, I.Sh. Eidipov. - M .: Stroyizdat. - 1973. - 320 p.

3. GOST 6992-68 Materials for paint and varnish. Method for determining the stability of the coating in atmospheric conditions.

Claims (1)

The composition of the dry mix for puttying, including fluffy lime, filler, plasticizing, mineral and polymer additives, characterized in that it contains Kratasol-PFM as a plasticizing additive, as a polymer additive - redispersible powder "Neolith P 4400", as mineral additives - synthesized aluminosilicates obtained by mixing water and aluminum sulfate to obtain a solution with pH 4, increase the pH to 8.5-11 by adding sodium silicate with stirring, separation of the obtained solid precipitate, etc. washing it to obtain a filtrate with a pH of 6 and drying the precipitate, and as a filler - chalk, in the following ratio of components, parts by weight:
Lime Fluff 58.9-66.7 Filler - chalk 28.2-31.8 Mineral supplement - synthesized aluminosilicates 5.9-6.7 Polymer additive - redispersible powder "Neolith P 4400" 0.29-0.31 Plasticizing additive - Kratasol-PFM 0.57-0.63