CS270250B2 - Method of buildings' supplementary insulation - Google Patents

Description

The invention also relates to a method for additional insulation of buildings by injecting a polymer composition into holes drilled in masonry.

The additional insulation of buildings # masonry pillars # from moisture is a technical problem # that has long been employed by professionals around the world, often it happens that masonry of buildings without or with insufficient insulation # is damaged by moisture and slowly becomes disturbed. This process can be suppressed if additional substances are deposited in the masonry or pillars which, due to the chemical reactions taking place at the designated sites, form a water-impermeable layer and thus prevent further moisture penetration.

The insulating composition may be introduced into the wall by drilling the wall through a series of bores. The isolated emulsion solution or suspension is then injected into the drilled holes. Cement mortar (Baumeister # 10) has long been used as an insulator, but it is also known to use a water glass composition (CS Patent No. 174548).

Hungarian Patent Specification No. 155545 discloses a process in which a solution of a silicone polymer prepared by dissolving the polymer in an organic solvent is applied to the surface of the wall to be protected.

For similar purposes, Machar Patent No. 165711 proposes an alcoholic solution # which contains ethylilicate and polyalkoxymethylsiloxane.

In these known compositions, an insulating effect is obtained by reacting tetraethoxysilane and polyethoxypolymethylsiloxane in the water present in the wall at ambient temperature to form a silicone resin. A water-impermeable layer of silicone resin prevents additional moisture from entering the wall to be treated.

In the method for post-isolation of buildings by injection according to the invention, a composition is used which is prepared by adding to the 2,5% to 24% mixture of tetraethoxysilane and the peroxy-polysiloxane oligomer of formula (I).

EtO OEt _R 1 - O - Г.1 bto OEt (AND) n

where n is an integer from 2 to 6 # as well as mixtures of these oligomers, prepared in a ratio of 3: 1 to 1: 3 #

2.5 to 6% of a blend containing 2 to 1: 4: 1 dichloroalkylsilane containing from 1 to 4 carbon atoms in the alkyl groups and an aluminum alcoholate or a mixture of aluminum alcoholates # then add up to 95% alcohol β 1 to 4 carbon atoms or mixtures of such alcohols # The mixture is stirred at 30 to 60 ° C for 30 to 120 minutes and then cooled to room temperature.

The process for producing the insulating composition of the present invention produces a product which contains aluminum incorporated in the molecule. This product hydrolyzes due to the water contained in the wall and is chemically bound by condensation with the silicate material of the wall.

In the process of the present invention, the effect achieved with the present composition exceeds the effect achieved with the prior art compositions for the following reasons: the water impermeable layer is formed substantially faster than the known compositions or the aluminum ions incorporated into the molecule contribute to condensation and act as a catalyst # or accelerate coupling reactions with the wall;

CS 270 250 B2 the aluminum-containing composition forms a water-impermeable layer that outperforms known products in terms of resistance to heat, weathering and chemicals; the composition is cheaper than the previously known compositions, since the introduction of aluminum compounds reduces the cost.

Less insulation material is required to achieve the same effect.

Insulation according to the invention is carried out by first injecting into the holes drilled in the masonry as a preliminary composition as above diluted to a solids content of 0.1 to 0.5% by weight. and after 5 to 30 minutes, the same composition containing 5 to 30 wt. solids.

The highly diluted solution is particularly suitable for penetrating all cracks, soils and pores.

In the case of hollow or cracked walls, it is advantageous to pour the holes with a repair cementitious mortar containing perlite and, once the mortar has hardened, to re-drill the injection holes. . These holes must then be free of dust, preferably lime water. The holes are then filled with the above-described composition.

The following examples illustrate the process of the present invention without limiting it in any way.

Example 1

Into a reactor equipped with a stirrer and a reflux condenser, 93.75 wt. parts of ethanol. To this is added at 50 ° C 2.5 parts by weight. 50% ethanolic solution of dichlorodimethylsilane. 1.25 wt. parts by weight of aluminum triisopropylate, 1.9 wt. parts of tetraethoxysilane and 0.6 wt. The mixture is stirred for 30 minutes and stored for one more day before use. The product obtained is suitable for insulating walls against moisture.

Example 2

A 0.5 wt.% Solution is prepared from the composition of Example 1 by diluting with ethanol. solids. Taking into account that the composition also contains ethanol, 50 parts by weight are calculated. of alcohol 5 parts wt. composition. In the test wall, holes at an angle of 30 ° are drilled at a height of 18 cm from the ground, and a diluted solution is injected into the holes. After 10 minutes, the composition of Example 1 (i.e. 30% by weight of the solid containing the composition) is injected into the holes. After 15 hours, the test wall is placed in water for 6 hours. The water content is 1.8 wt.

Claims (4)

A method for additionally insulating buildings by injecting a polymer composition prepared by contacting a polymer composition 2.5 to 24% of a mixture consisting of a tetraethoxysilane and a tetraethoxysilane oligomer of formula (I) -i-n-sx (I), EtO / tet n where 3: 2.5 n represents an integer from 2 to 1: 1, adds up to 6% of a mixture containing from 1 to 4 carbon atoms 6, as well as mixtures of these oligomers, prepared in an aluminum ratio, in a weight ratio of 2: 1 to 4: 1 dichloroalkylsilane in alkyl and aluminum alcoholate or a mixture of alcoholates CS 270 250 B2 is then added 75 to 95% of a C 1 -C 4 -alcohol or a mixture of such alcohols, the mixture is stirred at 30 to 60 ° C for 30 to 120 minutes and then cooled to room temperature, characterized by first pre-injecting said composition diluted to a solids content of 0.1 to 0.5% by weight, and after 5 to 30 minutes, is further injected with said composition comprising 5 to 30% by weight of solid.