Polyisocyanate composition for concrete impregnation and method for concrete impregnating

FIELD: building materials.

SUBSTANCE: invention relates to polyisocyanate compositions used for impregnation of concrete construction surfaces for aims of their anti-corrosive protection, and to a method for concrete impregnating by using the indicated composition. The claimed composition comprises earth-alkali metal salt dissolvable in polyisocyanate taken in the amount 0.1-5 mas. p. p. per 100 mas. p. p. of polyisocyanate. Except for, the composition can comprise additionally a hydrophobic solvent and a hydrophobic plasticizer. The claimed composition provides the deep penetration of impregnation up to 9.5 mm. The composition can be used in impregnation of brick masonry, sandy-cement covering for floors, in reconstruction of reservoirs for liquids storage and ferroconcrete constructions.

EFFECT: improved and valuable properties of composition.

6 cl, 1 tbl, 27 ex

 

The technical field

The invention relates to compositions of which the main component is a polyisocyanate, and may find use in the impregnation of the surfaces of concrete structures and structures with the purpose of corrosion protection.

The level of technology

The compositions containing the polyisocyanate, are widely used for impregnation of concrete.

The composition according to the author's certificate of the USSR 1348323 (04 41/63, publ. 30.10.87) contains a polyisocyanate, butyl ester acetic acid, aqueous solution of sodium silicate and an aqueous solution of kerosene contact Petrov.

The composition according to the author's certificate of the USSR 1560530 (04 41/63, publ. 30.04.90) contains a polyisocyanate and an ester of orthosilicic acid content 2-3 silicon atoms.

The composition according to the author's certificate of the USSR 1574581 (04 41/63, publ. 30.06.90) contains methyl methacrylate, the polymerization initiator, the polyisocyanate, alkylbenzenesulfonate calcium and acetone.

The composition according to the author's certificate of the USSR 1715791 (04 41/63, publ. 29.02.92) contains a polyisocyanate, butyl ester acetic acid, liquid glass, oligopyrroles and alkylsilanes sodium.

The composition according to the author's certificate of the USSR 1825768 (04 41/63, publ. 07.07.93) contains epoxy Dianova resin, polyisocyanate, 2,4,6-Tris-(dimethylaminomethyl)-phenol and phenylglycidyl ether.

Composition containing met methacrylat, dimethylaniline, polyisocyanate and benzoyl peroxide, as described in the book "Corrosion in construction" (Vol.5, Moscow, minmontazhspetsstroj of the USSR, 1988, p.12-16).

In the patent of the Russian Federation 2202582 (C 09 D 133/10, C 09 D 175/04, C 08 L 75/04 publ. 20.04.2003) specified the disadvantage of this composition is low penetrating power. According to the invention, it is increased by adding to the composition of the hydroxyl-containing compound selected from the group of lower alcohols and/or simple low molecular weight polyesters.

Low penetration ability is a drawback, common to all polyisocyanate compositions. Since the surface of the pores impregnated concrete, as a rule, is always water, isocyanate groups easily with her react. When the viscosity of the composition increases dramatically and the impregnation process is terminated. So, if the composition for impregnation consists of MDI as described in example 23 of the patent of the Russian Federation 2128674 (C 08 G 18/02, C 08 L 79/00, publ. 10.04.99), after application of the composition on the surface of the concrete by any known method is the impregnation of concrete can be discontinued after three or four hours. During this time, the polyisocyanate penetrates into concrete volume by a fraction of a millimeter.

To reduce the probability of interaction of the isocyanate groups with water it is necessary to either reduce the probability of interaction isocyanate GRU is p with water, either lower the speed of such interaction. The first can be achieved, for example, a thorough drying of the concrete, which is practically difficult to implement. The second reach of the introduction into the composition of hydrophobic solvent or plasticizer, which slightly increases the penetrating power of the composition and, consequently, the depth of impregnation.

The impregnation can be carried out also by injection, in which the composition is injected into the concrete within a short period of time under pressure. However, this method has limited application and is not the subject of this review.

In the patent JP 10-130575 (19.05.1998) disclosed polyisocyanate composition for impregnation of concrete containing 0,0005-1·10-7parts by weight of salts of alkaline earth metal (in particular, calcium, strontium or barium) per 100 parts by weight of isocyanate component, such as diphenylmethanediisocyanate. Additionally, the composition may contain polyoxypropyleneglycol and dioctylphthalate. Salt of the alkali metal is in the composition in suspension and catalyzes the interaction of MDI with a film of water sorption on the surface of the concrete stone. Polyoxypropyleneglycol enhances the catalytic effect of salts of alkaline earth metals. That is, salts of alkaline earth metals in this composition took contribute is to increase its viscosity and, consequently, reduces its penetration capability.

The invention

The basis of the invention tasked to develop a polyisocyanate composition having a high penetrating power.

Another object of the invention is to develop a method that provides greater depth of impregnation of concrete.

According to the invention, the first task is solved in that the polyisocyanate composition for impregnation of concrete used salt, alkaline earth metal, soluble in the polyisocyanate or organicheskikh solvents, and this salt is taken in an amount of 0.1-5 parts by weight per 100 parts by weight of MDI.

When the salt content of alkaline earth metal lower to 0.1 parts by weight of the penetrating ability of the composition does not increase. Add in the salt composition of the alkali earth metal in an amount greater than 5 parts by weight, increases the viscosity of the composition, i.e. reduces its penetration capability.

Preferably, as salts of alkaline earth metal composition contains a salt of fatty acid.

Especially good results are obtained when the salts of alkaline earth metals are used in combination with hydrophobic solvents and/or plasticizers.

The second objective of the invention is solved in that in the method of impregnation of concrete, comprising coating the surface of concrete polisiya atoi composition, as the polyisocyanate composition using the composition described above.

Contained in the deposited compositions of salts of alkaline earth metal block the interaction of the isocyanate groups with water in the concrete, the time to reach the critical composition viscosity increases and it manages to penetrate deeper into the surface layer of concrete. This is particularly evident when using compositions containing the salts of the alkali earth metal salt of a fatty acid. It can be assumed that such salts as surfactants, are sorbed on the surface of pores impregnated concrete and create a structural barrier, which barrier contact isocyanate groups existing in the concrete with water.

Examples of carrying out the invention

Examples of polyisocyanates suitable for carrying out the invention are crude diphenylmethanediisocyanate, distillation residues from the production of diisocyanate, the product of the interaction of 1M polypropylenglycol with MM=1000 and 2M diisocyanate.

Examples of salts of alkaline earth metals suitable for use in the composition are calcium chloride, magnesium chloride, barium chloride, calcium acetate, calcium oleate, magnesium oleate or barium oleate.

Examples of hydrophobic solvents suitable for use in the composition are toluene, xylene.

Examples of hydrophobic plasticizers suitable for use in the composition are dibutyl phthalate, dioctylphthalate, tricresylphosphate.

Can be used and other well-known experts in the field of substance related to the above mentioned groups of substances.

The table below shows examples of compositions that were tested during the impregnation of concrete. The composition was prepared immediately before testing. Salts of fatty acids was dissolved directly in the composition. Salts of other acids previously dissolved in a small amount of solvent is acetone, alcohol or toluene and then added to the composition. As acetone and alcohol used in neznachitelnym quantities and their presence does not affect the properties of the compositions in the examples they are not specified.

We investigated the depth of impregnation. For this purpose, we used the columns of concrete with a diameter of 1 cm with a porosity of 4% and a humidity of 5%. On the test column was put on the rubber tube and put it vertically. In the segment of the tube, protruding above the surface of the column layer 1 cm poured the prepared composition, the top of the tube was closed by a metal disk. The experiments were carried out at a temperature of 20°C. After three days nitialize the remainder of the composition from the tube was decanted and determined the depth of impregnation. The results of measuring the response given in the fourth column of the table.

Ingredients compositionAmount., wt. partsThe depth of impregnation, mm
1The crude diphenylmethanediisocyanate1000,5
2The crude diphenylmethanediisocyanate1001,5
Toluene100
3The crude diphenylmethanediisocyanate1001
Dibutyl20
4The crude diphenylmethanediisocyanate1001
Tricresylphosphate100
5The crude diphenylmethanediisocyanate1000,5
Sodium chloride1
6The crude diphenylmethanediisocyanate1001
Calcium chloride1
7The crude diphenylmethanediisocyanate100 1
Calcium acetate1
8The crude diphenylmethanediisocyanate1001
Magnesium chloride1
9The crude diphenylmethanediisocyanate1001
The barium chloride1
10The crude diphenylmethanediisocyanate1002,5
Magnesium chloride1
Toluene100
11The crude diphenylmethanediisocyanate1003
Magnesium chloride1
Xylene100
The dioctylphthalate20
12The crude diphenylmethanediisocyanate1001
The magnesium oleate0,1
13Neoc is on diphenylmethanediisocyanate 1002,5
The magnesium oleate0,5
14The crude diphenylmethanediisocyanate1003,5
The magnesium oleate1
15The crude diphenylmethanediisocyanate1003,5
The magnesium oleate2
16The crude diphenylmethanediisocyanate1003
The magnesium oleate3
17The crude diphenylmethanediisocyanate1002
The magnesium oleate5
18The crude diphenylmethanediisocyanate1005,5
The magnesium oleate1
The dioctylphthalate20
19The crude diphenylmethanediisocyanate1007,5
The magnesium oleate1
Xylene20
20The crude diphenylmethanediisocyanate1009,5
The magnesium oleate1
Xylene100
The dioctylphthalate20
21Distillation residues from the production of diisocyanate1000
22Distillation residues from the production of diisocyanate1001
Toluene100
23Distillation residues from the production of diisocyanate1002
Magnesium chloride1
Toluene100
24Distillation residues from the production of diisocyanate1004
The calcium oleate1
Toluene100
25The product of the interaction of 1M polypropylenglycol
MM=1000 and 2M diisocyanate1000.5
26The product of the interaction of 1M polypropylenglycol
MM=1000 and 2M diisocyanate100
Toluene1002
27The product of the interaction of 1M polypropylenglycol
MM=1000 and 2M diisocyanate100
The barium oleate1
Toluene1006

In the table examples 1-5, 21, 22, 25, 26 are shown for comparison. From examples 1, 21 and 25 can be seen that in the case of using only the polyisocyanates depth of saturation is negligible. Adding alkali metal salt (example 5) at a depth of impregnation is not affected. As can be seen from examples 2, 3, 4, 22, 26, introduction to the composition of the hydrophobic solvent or plasticizer increases the penetrating power of the comp the positions and therefore, the depth of impregnation.

Example 6-9 shows that when introduced into the composition of chlorides and acetates of alkaline earth metals is achieved depth of impregnation commensurate with that achieved by the introduction of hydrophobic solvents or plasticizers.

A greater depth of impregnation is achieved by the introduction of salts of fatty acids (examples 13-17).

The depth of saturation increases, if together with chlorides and acetates of alkaline earth metals using hydrophobic solvents and plasticizers (examples 10, 11, 23).

Nailuchshie results are achieved when the composition contains a salt of a fatty acid and a hydrophobic solvents and plasticizers (examples 18, 19, 20, 27).

Composition for industrial use are sold in finished form. An industrial application of the prepared composition was applied on the surface of concrete structures by spraying, brush or roller.

The composition can be used for drawing on the walls of new and repair of old structures or facilities: tanks for storing liquids, concrete and reinforced concrete structures, various hydraulic structures, premises, under the influence of moisture, such as basements. and so the depth of penetration of the composition, including when applied to wet surface is resti, provides a large thickness of the hardened layer and, consequently, increase the corrosion resistance of structures and facilities, as well as better protection from moisture.

It should be noted that the use of a composition is not limited to the impregnation of concrete surfaces. For professionals it is clear that it can also be used for impregnation of such surfaces, such as brick, sand and cement floorings and roofs etc.

1. Polyisocyanate composition for impregnation of concrete containing salt, alkaline earth metal, characterized in that it contains salt, alkaline earth metal, soluble in the polyisocyanate or in organic solvents, in an amount of 0.1-5 parts by weight per 100 parts by weight of MDI.

2. Polyisocyanate composition according to claim 1, characterized in that salts of alkaline earth metal it contains a salt of fatty acid.

3. Polyisocyanate composition according to claim 2, characterized in that salts of alkaline earth metal it contains calcium chloride, magnesium chloride, barium chloride, calcium acetate, calcium oleate, magnesium oleate or barium oleate.

4. Polyisocyanate composition according to one of claims 1 to 3, characterized in that it further comprises a hydrophobic solvent.

5. Polyisocyanate composition according to one of claims 1 to 4, otlichayushiesya, that it further comprises a hydrophobic plasticizer.

6. The method of impregnation of concrete, comprising coating the surface of the concrete polyisocyanate composition, characterized in that the polyisocyanate composition use composition according to one of claims 1 to 5.



 

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