Adhesive composition for concrete surfaces

FIELD: construction.

SUBSTANCE: adhesive composition includes methyl methacrylate and benzoyl peroxide. The adhesive composition additionally contains triethanolamine, epoxy resin and a marshallite filler. Using the adhesive composition makes it possible to considerably increase the depth of porous material impregnation and to improve evenness of composition hardening in concrete. The adhesive composition may be used as a protective anticorrosion coating, in repair of various concrete structures from filling small cracks to puttying large defects, and also as a filling polymer composition for porous materials.

EFFECT: increased protection of concrete surfaces.

2 tbl, 7 ex

 

The claimed technical solution relates to building materials, namely, compositions for the repair and protection of concrete surfaces, and can be used as a protective anti-corrosion coating, repair of various structures of concrete and sealing small cracks to putty major defects, as well as casting polymer compositions for porous materials.

The most common among the compounds of this destination has received the formulations based on methyl methacrylate (MMA). These materials due to its low viscosity easily penetrate into the concrete, providing the obtained coating high strength (Ummarino. Betropolitan. Moscow, Stroyizdat, 1983, p.42).

It is known the use of copolymers based on methyl methacrylate (MMA), dimethylaniline, benzoyl peroxide, MDI for coating concrete surfaces (international application No. 2000129909/04). The coating on the basis of this composition is characterized by a high cohesive strength and considerable resistance.

The disadvantage of the composition is a significant viscosity, and therefore it is not a high sorption properties and capillarization in relation to the concrete and other porous materials. A second disadvantage of the composition is the presence in the system of toxic substances polyisocyanate and dimethylaniline

The closest technical solution to the claimed is anticorrosive composition for concrete, published in the collection "Corrosion in construction" (Vol.5, M., Machinostrotelnoi of the USSR, 1988, p.12-16). The composition has the following composition:

MMA - 75 parts by weight of

Polyisocyanat - 22 parts by weight of

Benzoyl peroxide and 15 parts by weight of

Dimethylaniline - 15 parts by weight of

However, in the case of high humidity impregnated material is observed podsinivanija composition and consequently there is insufficient depth of saturation and consequently a sharp decrease of the strength characteristics of the material. Also the disadvantage of this solution is the use of the composition of toxic substances.

The technical task to be solved by the invention is to provide a composition for impregnation of porous materials with high kapillaroprotektive, low sensitivity to moisture, ensuring high strength of the impregnated material, and replacement of toxic components on less toxic.

The problem is solved due to the adhesive composition comprising methyl methacrylate and benzoyl peroxide, optionally containing triethanolamine and epoxy resin in the following proportions of components: 100 parts by weight of methyl methacrylate, peraki the ü benzoyl 3-7 parts by weight, triethanolamine 5-20 parts by weight, epoxy resin 1-20 parts by weight of

The technical result of the use of the claimed composition is a significant depth of impregnation of a porous material, uniform curing of the composition in the concrete.

This technical result in the implementation of the proposed solutions is achieved by introducing into the composition containing methyl methacrylate and a curing initiator, advanced epoxy resin in an amount of from 1% to 20% and catalyst for the polymerization reaction, which is simultaneously curing agent is a tertiary aliphatic amine in an amount of from 5% to 20%.

At smaller values of the content of epoxy resin in the composition is observed incomplete polymerization of methyl methacrylate and the sample loses strength indicators, and at large values of the composition has a high viscosity, which prevents its use in the impregnation of porous materials.

When the content of triethanolamine below 5% of the polymerization of methyl methacrylate happening very slowly. Also observed in the excess of its content in the composition of more than 20%.

A particular case of implementation of the invention is the introduction into the composition of the filler artificial or natural origin, namely sand, quartz flour, solid and hollow glass microspheres, perlite, marshalite, in which Alceste from 50 to 600 parts by weight of filler per 100 parts by weight of the composition for application on vertical and inclined surfaces.

The main disadvantages of the prototype are low compressive strength and the presence in the system of toxic substances - polyisocyanate and dimethylaniline. Introduction to the system of triethanolamine allows you to increase the strength of the material and to reduce the harmful effects on the human body engaged in the manufacture of polymer concrete.

Additional search known solutions that match the distinctive features of the prototype of the signs showed that the claimed solution is not apparent to the expert in the obvious way from the prior art, and it is not detected.

Evaluation and evidence of the advantages of the claimed invention constructed on the measurement of technological and operational characteristics of the compositions with the same ratio of methyl methacrylate and different content of the initiator of the polymerization reaction (on 100 parts by weight of methyl methacrylate was used from 3 to 7 parts by weight of the initiator), but with the use in the inventive composition of epoxy resin, from 1% to 20% and triethanolamine in a ratio of from 5% to 10%.

The claimed invention can be implemented as follows. The methyl methacrylate is mixed with epoxy resin and before use in the resulting solution add the triethanolamine and benzoyl peroxide. In the particular case of the implementation of the image is etenia impose additional specified amount of filler.

The concrete surface is cleaned from external pollutants, conduct traditional treatment: peskostruya, degreasing. The prepared composition is applied by brush, trowel, roller or loading, then utverjdayut at ambient temperature.

The invention is illustrated by the following examples.

Example 1.

20.0 parts by weight of epoxy resin is dissolved in 100.0 parts by weight of methyl methacrylate. Before use, this solution introduces 12.5 parts by weight of triethanolamine and 3.0 parts by weight of benzoyl peroxide. In the particular case of the invention in the mixture is introduced 300 parts by weight of filler.

Example 2.

20.0 parts by weight of epoxy resin is dissolved in 100.0 parts by weight of methyl methacrylate. Before use, this solution introduces 12.5 parts by weight of triethanolamine and 7.0 parts by weight of benzoyl peroxide. In the particular case of the invention in the mixture is introduced 300 parts by weight of filler.

Example 3.

10.5 parts by weight of epoxy resin is dissolved in 100 parts by weight of methyl methacrylate. Before use, this solution is injected 5.0 parts by weight of triethanolamine and 3.0 parts by weight of benzoyl peroxide. In the particular case of the invention in the mixture is introduced 300 parts by weight of filler.

Example 4.

10.5 parts by weight of epoxy resin is dissolved in 100 parts by weight of methyl methacrylate. Before use, this solution is introduced 20.0 parts by weight of triethanolamine and 3 parts by weight of benzoyl peroxide. When the frequency of the om case of realization of the invention in the mixture is introduced 300 parts by weight of the filler.

Example 5.

1.0 parts by weight of epoxy resin is dissolved in 100 parts by weight of methyl methacrylate. Before use, this solution introduces 12.5 parts by weight of triethanolamine and 7.0 parts by weight of benzoyl peroxide. In the particular case of the invention in the mixture is introduced 300 parts by weight of filler.

Example 6.

20.0 parts by weight of epoxy resin is dissolved in 100 parts by weight of methyl methacrylate. Before use, this solution is injected 5.0 parts by weight of triethanolamine and 5.0 parts by weight of benzoyl peroxide. In the particular case of the invention in the mixture is introduced 300 parts by weight of filler.

Example 7.

10.5 parts by weight of epoxy resin is dissolved in 100 parts by weight of methyl methacrylate. Before use, this solution is injected 5.0 parts by weight of triethanolamine and 7.0 parts by weight of benzoyl peroxide. In the particular case of the invention in the mixture is introduced 300 parts by weight of filler.

The properties of the materials obtained with the use of known and proposed composition shown in table 1.

Table 1
PropertyTrack
KnownProposed sample
12 34567
1. Compressive strength after a month of curing, MPa39.160.060.342.540.550.185.3120.5
2. Water absorption one month after curing for 24 h, %3.51.31.43.12.23.01.41.1

As can be seen from the table, the change in the amount of epoxy resin, triethanolamine and benzoyl peroxide changes the properties of the obtained material. This is due to a change in the viscosity of the composition, and consequently, to reduce the depth of impregnation of the filler. When reducing the viscosity of the composition is increased smachivaemost filler-wicking composition of micro-cracks and chips of the filler. This leads to a decrease of water absorption and to increase the strength characteristics. The strength of the composition Uwe is aceveda due to polymerization of the components. Different contents of epoxy resin also affects the strength of the resulting material. The lack of resin - reducing the number of crosslinks as a result of the decrease in the compressive strength and the increase of water absorption. The optimal value of the operational characteristics is achieved in the absence of a system of excess monomers.

The depth of impregnation composition was determined on standard cement-sand samples with a ratio of: silica sand 3 parts by weight, the cement M-500 1 parts by weight of the Samples was applied to a polished surface with a layer of 20 mm and was overidealize within 72 hours. In the composition (1-7) was additionally introduced to 0.001 parts by weight of a fluorescent dye. After curing, the samples were subjected to cross-cut, the slice was exposed to a UV lamp portable-4. The depth of saturation was measured with a caliper on the emitting zone. Data saturation is presented in table 2.

Table 2
PropertiesTrack
KnownProposed sample
1234 567
1. The depth of impregnation, mm2,22,72,72,82,83,12,72,9
2. The presence of uncured phase %not less than 10no

Adhesive composition for concrete surfaces, including methyl methacrylate and benzoyl peroxide, characterized in that it further comprises triethanolamine, epoxy resin and the filler Marsala when the following ratio of components, parts by weight:

The methyl methacrylate100
Benzoyl peroxide3-7
Triethanolamine5-20
Epoxy1-20
Marsala300



 

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1 tbl, 6 ex

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2 tbl, 4 ex

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2 tbl, 3 ex

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2 tbl, 6 ex

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2 tbl, 13 ex

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