RU2083520C1 - Composition for protective coating of concrete - Google Patents

Abstract

FIELD: construction, more particularly preparation of composition for protective coating of concrete. SUBSTANCE: composition for protective coating of concrete (wt%): 2-25 latex; 3-25 solid hydrocarbons; 3-40 low- melting paraffin component; C₁₀-C₁₃- or C₁₀-C₁₆- or C₁₇-C₂₀-fatty acids; 1-6 C₂₁-C₂₅-fatty residues or C₁₀-C₂₀-soap stock stillage residues; 0.3-5 alkali component; 0.05-3 polyoxyethylene glycol and fatty acid mono- and diesters; 0.037-0.07 ethylenediaminotetracetic acid disodium salt trilon; 0.05-8.0 unsaturated oxidized polymeric acids or alkyd resins; 0.001-0.003 siccatives, the balance. The claimed composition has no thixotropy and water-retaining power. The resulting coating has high light reflecting power. EFFECT: improved properties of the composition. 2 tbl

Description

 The invention relates to construction production and can be used to protect against dehydration of freshly laid concrete of roads and airfields, lining of irrigation canals, in hydraulic engineering and monolithic housing construction, during solar thermal treatment, air-dry, induction, infrared and electric heating of freshly formed precast concrete and reinforced concrete structures and products, including bridge structures, beams, plates, piles, supports, pipes, tubing, cement-sand tiles, side stones, and same for water-repellency and reduce water absorption of precast concrete and concrete structures and products.

Known composition for coating, including, by weight. latex 5-50, petrolatum 7.5-28.5, waste from the production of lanolin 1.0-3.8, soda 0.5-1.9, water - the rest [1]
Closest to the proposed technical essence and the achieved result is a composition for a protective coating on freshly laid concrete, including high-melting and low-melting paraffin hydrocarbons, emulsifier, latex and water in the following ratio of components, wt.

High melting paraffin hydrocarbons 3,5-20,5
Low melting paraffin hydrocarbons 3.8-25.2
Emulsifier 3-7.3
Latex 3-25
Plasticizer 0.5-5.6
Water The rest.

The composition is prepared at a temperature of 70-90 ^o C [2]
Known compositions are characterized by increased viscosity, and at low positive temperatures they turn into non-flowing pastes, which makes it difficult or impossible to transport and use them in polygon conditions in the autumn-spring period of the construction of roads, airfields, lining of irrigation canals, etc. The introduction of a plasticizer in the composition due to their thixotropic properties gives only a temporary effect of lowering the viscosity and, moreover, reduces the aggregative stability of the compositions and the water-holding ability of the formed coatings. An additional dilution of the compositions with water leads to the same effect. In addition, the known compositions are characterized by insufficient water-holding and light-reflecting ability of coatings formed on the surface of freshly laid concrete, which reduces the quality of reinforced concrete products during hardening in conditions of low relative humidity and elevated temperatures.

 The objective of the invention is the reduction of viscosity and the exclusion of thixotropy of the composition, increasing the water-holding ability and light reflectance of the coating.

This is achieved by the fact that the composition for the protective coating of concrete, including latex, solid hydrocarbons, a low melting paraffin component, fatty acids, an alkaline component, a polyoxyethylene glycol plasticizer and water, contains C ₁₀ -C ₁₃ or C ₁₀ fatty acids as fatty acids -C ₁₆ or C ₁₀ -C ₂₁ or C ₁₇ -C ₂₀ and C ₂₁ -C ₂₅ fatty acids or their bottoms or bottoms of co-stocks of the C ₁₀ -C ₂₀ fraction as a plasticizer based on polyethylene glycol mono- and polyoxyethylene glycol diesters and fatty acids and supplements Tel'nykh disodium edetate Trilon "B", the oxidized unsaturated polymeric acids or alkyd resins and driers in the following ratio, wt.

Latexes 2-25
Solid hydrocarbons 3-25
Low melting paraffin component 3 40
Fatty acids of the fraction C ₁₀ -C ₁₃ or C ₁₀ -C ₁₆ or C ₁₇ -C ₂₀ or C ₁₀ -C ₂₁ 0.5 3
Fatty acids of fraction C ₂₁ -C ₂₅ or their bottoms or bottoms of co-stocks of fraction C ₁₀ -C ₂₀ 1 6
Alkaline component 0.3 5.0
Mono- and diesters of polyoxyethylene glycol and fatty acids 0.05 3.0
Disodium salt of ethylenediaminotetraacetic acid Trilon "B" 0,035 - 0,07
Unsaturated polymer oxidized acids or alkyd resins 0.05 8
Desiccants 0.001 0.03
Water The rest.

As a high-melting paraffin component, the composition contains solid petroleum paraffins (GOST 23683-79) with a melting point of 42 - 65 ^o C, or ceresin C ₃₆ -C ₅₅ (GOST 2488 79) with a melting point of 65 88 ^o C, or petrolatum (OST 38 01117 76) with a dropping point of 55 65 ^o C.

As a low-melting paraffin component, the composition contains soft petroleum paraffin (TU 38-101-1129-87) with a pour point of 14 - 32 ^o C or soft petroleum paraffin for the production of FFA (TU 38.601-09-165-80) Fractions 320 460 ^o or liquid petroleum paraffins of the C ₁₀ -C ₂₄ series with boiling limits at temperatures from 180 to 360 ^o C liquid paraffin for BVK fraction 180 320 ^o (TU 38.101856-84) or fraction 220 345 ^o (TU 38.101531-79) or normal liquid purified paraffin fraction 220 320 ^o (TU 38.101686-77) or paraffin oil for the production of liquid surfactants fraction 275 360 ^o (TU 38.101874-83) or distillate ha (TU 38-00-1299-78) with mineral oil content to 30% or slop vox mixture of soft paraffin and mineral oil (50%); pour point of gacha 25 29 ^o C, slop-wax 29 ^o C32 ^o C.

The high-melting paraffin component of the composition (hard paraffins, petrolatum, ceresin) accelerates the formation of a hard coating strip, increases its reflective properties and provides high moisture-holding ability of the coating at elevated temperatures (40 ^o C95 ^o C) of the medium and air-dry heating of concrete.

The low-melting paraffin component of the composition (liquid and soft paraffins, slop-vox, gach) ensures the clogging of the surface pores of concrete by impregnation and preservation of low surface water absorption of concrete after abrasion of the surface film of the coating (consisting of hard paraffins and latex) by the wheels of cars and aircraft. Low surface water absorption of road concrete significantly increases its resistance to aggressive anti-ice defrosting salts. As an acidic component, the composition contains low and medium molecular weight synthetic fatty acids of the C ₁₀ -C ₂₁ fraction, for example, acids of the C ₁₀ -C ₁₃ fraction with an acid number (CN) of 285 300 mg KOH / g or of the C ₁₀ -C ₁₆ fraction with CN 245 260 or fractions C ₁₇ -C ₂₀ with KP 195 205 or fractions C ₁₀ -C ₂₁ with KP 200 240 (GOST 23239-78) or oleic acid with KP 175 200 (GOST 7580-55) or bottoms of co-stocks of vegetable oils of fraction C ₁₀ -C ₂₀ with CK 180 190.

As a high molecular weight acid component, the composition contains synthetic fatty acids of the fraction C ₂₁ -C ₂₇ , for example, acids of the fraction C ₂₁ -C ₂₇ , for example, acids of the fraction C ₂₁ -C ₂₅ with CN 180 190 mg KOH / g (TU 38-10716- 75) or VAT residues of synthetic fatty acids with CN 60 135 (OST 38-01182-80) or stearic acid (GOST 66484-64) with CN 195-210 or wool fatty acids of fraction C ₉ -C ₃₄ with CN 40-100 (TU 17-61-03-02-82). As an alkaline component of the emulsifier, the composition contains a mixture of triethanolamine (TU 6-02-916-79) or diethanolamine (TU 6-02-701-78), or morpholine (TU 6-14-366-80) and potassium oxide hydrate (KOH ) according to GOST 9285-78 or potassium carbonate (potash) K ₂ CO ₃ (GOST 10690-73E) or 25% aqueous ammonia solution (GOST 9 77). As the latex of the aqueous rubber dispersion, the composition contains divinyl styrene latex 35% BS-30 or 45% BS-50, or 45% BS-85, or 46% SKS 65GP, or 55% SKS -50 GKP, or 65% SKS-S, or 30% SKS-30 (ShR, ShhP, U), or piperylene-styrene latex 42% SKPS-50, or 30% LPS-50 or latex of butyl rubber, or natural rubber latex of the Qualitex, Revertex, Revultex brands. Triethanolamine- (or diethylethanolamine-, or morpholino-) potassium or ammonium soaps of high molecular weight synthetic fatty acids (FR. C ₂₁ -C ₂₇ or their bottoms), formed during the synthesis of the paraffin component, and soaps of low and medium molecular weight synthetic fatty acids (FR . C ₁₀ -C ₁₆ or C ₁₀ -C ₂₁ , etc.) intensive dilution and complete removal of the effect of thixotropy (solidification) of the composition. Additional dilution and aggregative stability of the composition during storage provides the addition of rubber latex.

Fatty acids of lower molecular weight (C ₇ -C ₉ fractions) cause coagulation of the composition and cannot be used for its synthesis.

To soften the water used in the preparation of the composition, in order to prevent precipitation of alkaline soaps of the emulsifier (due to their interaction with multivalent cations Ca ⁺⁺ , Mo ⁺⁺ , Al ⁺⁺⁺ , etc. contained in untreated water) and additional thickening of the composition, the latter contains a complexing agent, for example, ethylene diamine-tetraacetic acid disodium salt Trilon "B" (TU 113-04-260-87).

For more effective fine dispersion of high-melting paraffins, petrolatum, ceresin during emulsification, the composition contains a dispersant ^ for example, leucanol or mono- and diesters of polyoxyethylene glycols and fatty acids of the general formula C _n H _2n ± 1 COO (C ₂ H ₄ O) _m H, where n 10 18, m 5 10.

 To improve film formation, increase light reflectance and adhesive strength of the coating to concrete, the composition contains unsaturated polymeric oxidized acids (drying oils) or alkyd resins (glyphthalic or pentaphthalic) and desiccants that accelerate film formation (calcium naphthenates, or lead and cobalt (II) linoleates, or manganese thallates or iron resinates).

The composition is prepared by dispersing in hot (50 80 ^o C) water the calculated amount of high-melting and low-melting paraffin components and unsaturated oxidized polymeric acids or alkyd resins with desiccants in the presence of an emulsifier, complexing agent and dispersant, followed by cooling of the resulting dispersion and shifting it with a calculated amount of latex.

The composition is applied to exposed surfaces of concrete, including freshly laid, by spraying, for example, pneumatic, airless, etc. at an air temperature of 1 50 ^o C. The formation time of a vapor-tight film on dry concrete is from 0.5 to 3 hours, on freshly laid concrete from 2 to 8 hours, depending on the temperature and relative humidity of the medium. The consumption of the composition for coating concrete is 150 300 g / m ² .

 Specific examples of implementation, physico-mechanical characteristics of concrete protected by the composition of the prototype and the proposed composition are presented in table. 1 and 2.

Claims (1)

A concrete coating composition comprising latex, solid hydrocarbons, a low melting paraffin component, fatty acids, an alkaline component, a polyethylene glycol plasticizer and water, characterized in that it contains C _{1 0} C _{1 3} fatty acids as fatty acids, or C _{1 0} - C _{1 6} , or C _{1 0} C _{2 1} , or C _{1 7} C _{2 0} and fatty acids C _{2 1} - C _{2 5} or their bottoms or bottoms of co-stocks of the fraction C _{1 0} C _{2 0} , as a plasticizer based on polyethylene glycol, mono- and diesters of polyoxyethylene glycol and fatty acids and tively disodium edetate Trilon "B", the oxidized unsaturated polymeric acids or alkyd resins and driers in the following ratio, wt. Latex 2 25
Solid hydrocarbons 3 25
Low melting paraffin component 3 40
Fatty acids of the fraction C _{1 0} C _{1 3} , or C _{1 0} C _{1 6} , or C _{1 0} - C _{2 1} , or C _{1 7}
C _{2 0} 0.5 3.0
Fatty acids of fraction C _{2 1} C _{2 5} or their bottoms or bottoms of co-stocks of fraction C _{1 0} - C _{2 0} 1 6
Alkaline component 0.3 5.0
Mono- and diesters of polyoxyethylene glycol and fatty acids 0.05 3.0
Disodium salt of ethylenediaminotetraacetic acid Trilon "B" 0,035 0,07
Unsaturated polymer oxidized acids or alkyd resins 0.05 8
Desiccants 0.001 0.03
Water the rest

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