RU2455265C2 - Composition for concrete protective coating - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to a composition for concrete protective coating and can be used in protecting freshly laid concrete of roads and aerodromes from dehydration, as well as in hydraulic engineering and monolithic building construction. The composition for concrete protective coating contains latex, a paraffin component, C₁₃ fatty acid, an alkaline component, a surfactant - OP-7 or OP-10, a thickener and water. The alkaline component is selected from triethanol amine and the paraffin component is paraffin wax, with the following ratio of components, wt %: latex 2-25, paraffin wax 3-25, C₁₃ fatty acid 0.5-3,0, triethanol amine 0.3-5.0, said surfactant 0.1-0.5, thickener 0.1-0.5, water - the balance.

EFFECT: preparation of a composition with optimum viscosity which does not change during prolonged storage.

2 cl, 1 tbl

Description

The invention relates to construction production and can be used to protect against dehydration of freshly laid concrete of roads and airfields, in hydraulic engineering and monolithic housing construction.

A known composition for applying to freshly laid concrete, including 45-65% divinyl styrene latex, solid hydrocarbons, waste production of lanolin, soda ash and water in the following ratio, wt.%:

45-65% divinyl styrene latex 5-50 Petrolatum 7.5-28.5 Lanolin production waste 1.0-3.8 Soda ash 0.5-1.9 Water Rest

(USSR copyright certificate No. 1100273, class C04B 41/30. Publ. 30.06.84 Bul. No. 24).

However, the known composition has insufficient ability to reduce the moisture absorption of freshly prepared concrete and protect the concrete from the formation of small cracks.

A composition for protecting freshly prepared concrete is also known, including 45-65% divinyl styrene latex, petrolatum, waste from the production of lanolin based on wool fatty acids, soda ash, a by-product of oil dewaxing, plasticizer and water in the following ratio, wt.%:

45-65% divinyl styrene latex 3-25 Petrolatum 3,5-20,1 Lanolin production waste 1.8-4.2 Soda ash 1.2-3.1

By-product of oil dewaxing - distillate gach or waste oil dehydration gacha - slop-vox

paraffin based 3.8-25.2 Plasticizer 0.5-5.6 Water Rest

(USSR author's certificate No. 1275016, CL 04B 41/63. Publ. 07.12.86, Bull. No. 45).

The disadvantage of this composition is the increased viscosity, and at low positive temperatures - the transformation into a non-fluid paste, which complicates its use in polygon conditions in the spring-autumn period.

Closest to the proposed in its technical essence is a composition for protective coating of concrete, including latex, solid hydrocarbons, paraffin component, fatty acids of fraction C 13, alkaline component and water (RF patent No. 2083520, CL 04B 26/02, 04B 24 / 08, С04В 24/04, С04В 41/63, published on July 10, 1997).

But this composition does not provide optimal viscosity, which complicates the work of technological equipment during its preparation. In addition, the viscosity of the composition increases significantly during long-term storage.

The problem to which the claimed invention is directed is to create a composition with optimal viscosity that does not change during long-term storage.

The problem is solved in that in the composition for the protective coating of concrete, including latex, paraffin component, C ₁₃ fatty acids, alkaline component and water, the surfactant OP-10 or OP-7 and a thickener are additionally introduced. Moreover, triethanolamine was chosen as the alkaline component, and solid paraffin was used as the paraffin component in the following ratio of components, wt.%:

Latex 2-25 Paraffin wax 3-25 C ₁₃ fatty acids 0.5-3.0 Triethanolamine 0.3-5.0 Specified Surfactant 0.1-0.5 Thickener 0.1-0.5 Water Rest

The introduced surfactant stabilizes the viscosity and ensures the preservation of its parameters during long-term storage.

And the introduced thickener makes it possible to obtain a composition with the desired viscosity.

Triethanolamine, selected as the alkaline component, ensures high stability of the paraffin component.

Hard paraffin, selected as a paraffin component, reduces the time of formation of a hard coating film, increases the reflective properties and the water-holding ability of the coating (see table).

Parameter The amount of wt.% Latex 2 fifteen 25 Paraffin wax 3 fourteen 25 Myristic acid 0.5 1.75 3.0 Triethanolamine 0.3 2.65 5,0 OP-10 0.1 0.3 0.5 OP-7 0.1 0.3 0.5 Thickener Na-carboxymethyl cellulose 0.1 0.3 0.5 Water 63.9 51.7 40.5 The viscosity of the composition according to B3-4, sec at a temperature of (20 ± 0.5) ° C 12 fifteen eighteen Preservation of the composition, month 12 12 12

The technical result is to improve the physico-mechanical properties of the composition.

The composition is prepared as follows.

The estimated amount of solid paraffin is melted at a temperature of 60 ° C. With stirring, add a solution prepared by mixing triethanolamine and fatty acid fraction C ₁₃ - myristic acid (C ₁₃ H ₂₇ COOH), a solution of triethanolamine soap fatty acid fraction C ₁₃ - myristic acid (C ₁₃ H ₂₇ COOH). The resulting emulsion is diluted with the calculated amount of latex stabilized with the surfactant OP-10 or OP-7. The viscosity of the composition is controlled by a thickener solution. Various types of thickener can be used, for example casein, cellulose, Na-carboxymethyl cellulose. Moreover, if the conditional viscosity along the funnel B3-4 at T = (20 ± 0.5) ° С for the prototype in a day was, for example, 11 seconds, and after 28 days - 17 seconds, then the proposed composition has a conditional viscosity for this the period remained constant - 12 sec. The composition is applied to open surfaces of freshly laid concrete by spraying at an air temperature of 1 ° C to 50 ° C.

The claimed composition in comparison with the prototype has an optimal viscosity that does not change during long-term storage, and can be effectively used to protect against dehydration of freshly laid concrete.

Claims (2)

1. The composition for the protective coating of concrete, including latex, paraffin component, fatty acid fraction C ₁₃ , an alkaline component and water, characterized in that it additionally contains a surfactant - ethoxylated alkyl phenols OP-10 or OP-7 and a thickener, while the triethanolamine is selected as the alkaline component, and solid paraffin is selected as the paraffin component in the following ratio of components, wt.%:
Latex 2-25 Paraffin wax 3-25 Fatty acid fraction C ₁₃ 0.5-3.0 Triethanolamine 0.3-5.0 Specified Surfactant 0.1-0.5 Thickener 0.1-0.5 Water Rest 2. The composition according to claim 1, characterized in that OP-10 is selected as a surfactant.