SU833782A1 - Method of producing composition for protecting concrete surface - Google Patents

Description

(54) METHOD FOR PREPARING A COMPOSITION FOR PROTECTION OF THE SURFACE OF CONCRETE

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The image refers to the methods of preparing the composition of the composite material for the surface treatment of concrete and reinforced concrete products in order to protect them from aggressive actions and improve their performance.

There is a known method for preparing a composition used for the surface treatment of concrete products, better and airfield and airfield coatings, as well as for repairing cracks, crevices and gouges by mixing monomer, polymer, accelerator and polymerization initiator, as well as reducing viscosity, followed by the introduction of mineral and full bodies and immediate application to the surface of a concrete product. Such a mixture hardens without heat at 1020 C and in a short time.

The disadvantage of the known condition is that, when mixing a solid polymer with a monometer, the former does not completely dissolve during the period of perementation with a mineral filler (1-2 minutes).

which requires the introduction of significant amounts of polymer in order to achieve the necessary uniformity and workability of a freshly prepared polymer-mineral mixture ,.

In addition, one-time preparation of the composition directly at the site of its application in each individual case creates significant inconveniences and difficulties associated with multiple dosing of the components of the mixture, which leads to heterogeneity of the properties of the prepared composition and reduction in the quality of finished ispels.

A disadvantage of the known method is that it does not allow organizing the centralized production of the composite material with its subsequent storage and transportation over long distances to the place of immediate exposure.

The closest to the proposed method of preparation of the composition, to protect the surface of betsha by applying 8. Mineral filler polymethyl megacrylate, benzoyl peroxide and plastic board in the following ratio of components, wt.% 92.40: 5.00: 0.35:: 2.25 respectively, with subsequent mixing with preliminarily, with a prepared mixture of methyl methacrylate, a polymerization accelerator, and oligoester acrylate with a low-sided ratio of components, masses. % 93.4: 3.2: 3.2 respectively 2. The disadvantage of this method is that the initiator is applied to the surface of the mineral filler by their combined mechanical mixing, which leads to local unevenness of the initiator distributor throughout the mineral part and a significant loss of initiator activity due to the mechanical forces of friction arising in the process of mixing and, consequently, a decrease in the strength and water resistance of concrete. The purpose of the invention is to increase the strength and wetting of concrete. The goal is achieved by the fact that in the method of preparing the composition for protecting the concrete surface by applying polymethyl methacrylate and benzoyl peroxide to the mineral filler, followed by mixing with the previously prepared mixture

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PRI mme R-2. Separately ready t50

The liquid part of the composition, wt.% g methyl methacrylate 80, Og polymethyl methacrylate 14.2; oligoether 5, O; dimethylaniline 0.8 by mechanical mixing of the components until 55 a uniform solution of viscosity 6O is formed.

The dry part of the composition is prepared by treating mineral filler.

(silica sand 9O, 0 wt.% + gypsum 1O, 0 wt.%) pre-made mixture consisting, wt.%: acetone 80.0; polymethyl methacrylate 5, benzoyl peroxide 15 taken in an amount of 8% by weight of the mineral filler. After complete removal of acetone in an air stream at a temperature not higher than 30 °, the dry part of the composition is ready for use. 2 methyl methacrylate, a polymerization accelerator and oligoether acrylate on a mineral filler are applied in an amount of 8-10% of its weight; a mixture containing, in mass%: polymethyl methacrylate, 3.0-6.0; benzoyl peroxide 10-25, organic solvent 70-85 and dried to completely remove the organic solvent, and then stirring with a pre-cooked mixture containing, in wt.%: methyl methacrylate. 75-80; a molecular mass of 1OOOOO-120000 10-18, a polymerization accelerator 0.8-1.2, and an oligoestercrylag, 5-13, until a homogeneous mass is obtained. Example 1. Separately, the liquid part of the composition of the composition, wt.%, Is prepared: methyl methacrylate 93.4; oligoester acrylate 3.2; dimethylaniline 3,2, and then - the dry part of the composition by mechanical mixing of the mixture composition, wt.%: quartz sand 80.0 gypsum 12.4, polymethyl methacrylate 5.0, with pre-prepared paste, wt.%: benzoyl peroxide 0.35 in dibutyl phthalate 2.25. The separately obtained liquid and dry parts are then mixed in a 1: 4 ratio until a homogeneous mass is formed. The properties of the samples prepared by the proposed and known methods of exthenes in the table.

5 63376 6

PRI me R 3. The liquid part of the composite strength and water resistance of concrete to

The positions are prepared according to Example 2. A dry minemineral filler is applied to the head to a composition that is also prepared at a rate of 8-10% of its weight, a mixture of some 2, with the difference that on the treatment-holding, k®cc.%: poly methyl methacrylate

mineral parts took 9.0 mixtures of soy-j 3,, 0 | benzoyl peroxide 10-25; acetone, polymethylmethacrylate solvent 70-85 and subjected to

and benzoyl peroxide. dried to completely remove the organic

Note ep4; The liquid portion of the composite solvent, and then

Positions are prepared. In Example 2. mixing with a pre-prepared

The dry part of the composition is prepared with a dry mixture containing, in wt.%:

Example 2 with the only difference that Methyl methacrylate: 75-8O

for the treatment of the mineral part, Polymethylmethac10, 0% of a mixture consisting of acetone, polyerylate with molecular

methyl methacrylate and benzoyl peroxide. mass 1OOOOO Formula of the invention Polymerization accelerator 0.8-1.2

The method of preparation of the composition for oligoether acrylate. 5-13 protection of the surface of concrete by applying 1 ° of obtaining the same on the mineral filler poly-20 NATIVE mass. Methyl methacrylate a and benzoyl peroxide Sources of information, followed by mixing with a pbc-taken into account in the examination of a prepared mixture of methyl methyl germanium application No. 1227376, methacrylate, polymerization accelerator. 1967. and Oligoethylacrylate A, distinguished by -25, “For the application of the Federal Republic of Germany N 1646927 / iti and with the fact that, with the aim of increasing 4 by 25 / O2, the publication. 1973.

, 5 -12000010-18

Claims (2)

Claim The method of preparing a composition for protecting the surface of concrete by applying poly-20 methyl methacrylate and benzoyl peroxide to a mineral filler, followed by mixing with a pre-prepared mixture of methyl methacrylate, a polymerization accelerator and oligoester acrylate a, differs by 25 ill and that in order to increase ; 75-80 10-18 0.8-1.2 5 -13 strength and water resistance of concrete on a mineral filler is applied in an amount of 8-10% of its weight a mixture containing, schss.%: Poly methyl methacryl at 3.0-6.0 (benzoyl peroxide 10-25; organic solvent 70- 85 and subjected to drying until the organic solvent is completely removed, and then stirring is carried out with a pre-prepared mixture containing, wt.%: Methyl methacrylate Poly methyl methacrylate with a molecular weight of 100,000-120000 Polymerization accelerator Oligoether acrylate to obtain a homogeneous mass. Sources of information taken into account in the examination 1. The application of Germany No. 1227376, published. 1967. 2. The application of Germany N? 1646927, ^ c. From 04 to 25/02, published. 1973.