JP2983101B2 - Leakage prevention composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water leakage preventing composition for preventing water leakage from concrete moldings, especially concrete buildings. More specifically, it is possible to prevent water leakage immediately even in rain by simply applying it to the water leakage site,
The present invention relates to a water leakage preventing composition having high permeability and improved storage stability.

[0002]

2. Description of the Related Art Leakage from cracks and gaps in concrete moldings, especially concrete buildings, causes serious damage. Since the roof and outer walls of concrete buildings are generally covered with multiple layers, such as waterproof layers, protective layers, and decorative layers, once rain leaks through those layers, it is extremely difficult to find the leak areas, and furthermore, sealing. In most cases, it cannot be prevented by partial repair with chemicals.
As a result, in the conventional method, it was necessary to perform a huge amount of labor, cost, and construction work, such as removal of the surface layer and the waterproof layer and replacement of the entire reed, including diagnosis of a location that caused a leak. Moreover, since these constructions cannot be carried out in rainy weather, it is impossible to prevent water leakage immediately.

In order to solve this difficulty, Japanese Patent Laid-Open Publication No. 2-29
4381 is (1) a surfactant, (2) a hydrophilic paste,
The present invention provides a rain leak preventive comprising (3) a water-insoluble powder and (4) water. According to this technology, it was found that even in the rain, it was possible to prevent rain leaks immediately with a very simple operation. However, this technique still had problems.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a method disclosed in
The present invention is intended to solve the following problems in the rain leak preventing agent shown in 294381. That is, (1) the water-insoluble powdery substance may settle and deposit during storage, and may not work effectively. (2) When applied from above the building surface layer, water-insoluble powdery substances may accumulate on the surface layer and may not reach the fine cracks in the concrete body. An object of the present invention is to solve such problems and to provide a composition which has improved storage stability and crack permeability, and which can immediately prevent rain leakage of concrete molded articles by simple construction. .

[0005]

SUMMARY OF THE INVENTION In order to solve such problems in the prior art, the present invention provides (1) osmotic water leakage characterized by containing a silica sol, a calcium-aggregating water-soluble polymer and water. (2) The composition for preventing water leakage according to the above (1), which comprises sodium higher fatty acid.

[0006] The osmotic water leakage preventing composition of the present invention (hereinafter referred to as the composition of the present invention) does not contain a water-insoluble powder, is not only stable to storage, but also forms a surface layer of a concrete molding in the rain. It was found that even if applied from above, it can penetrate deeply into the crack site and immediately and permanently prevent water leakage. The silica sol used in the present invention is an aqueous dispersion of silicic anhydride, and is commercially available as a transparent or cloudy stable liquid containing usually 20 to 45% by weight of silicic anhydride. The calcium-aggregating water-soluble polymer is a water-soluble polymer having a property of being aggregated into an insoluble gel when the aqueous solution comes into contact with calcium. Specific examples include sodium polyacrylate, sodium alginate, pectin and the like. Particularly, sodium polyacrylate is preferred.

The sodium higher fatty acid has 12 carbon atoms.
And sodium salts of 18 fatty acids can be used, and specific examples thereof include sodium salts such as lauric acid, myristic acid, palmitic acid and stearic acid. Mixtures of these may be used, and those commercially available as ordinary powdered soaps can be conveniently used. In the composition of the present invention,
The mixing ratio of the silica sol is not particularly limited, but is usually 0.1 to 50 as silicic anhydride based on the weight of the composition of the present invention.
It can be used in the range of weight%. The mixing ratio of the calcium-aggregating water-soluble polymer is not particularly limited, but it can be usually used in the range of 0.01 to 5% by weight of the solid content based on the weight of the composition of the present invention.

In the second invention of the present invention, the blending ratio of the higher fatty acid sodium is not particularly limited, but it can be usually used in the range of 0.1 to 10% by weight based on the weight of the composition of the present invention. The compositions of the present invention are prepared by dissolving or suspending these agents, preferably in water. Water may be mixed with a water-soluble solvent such as methanol or ethanol. It is generally preferred that the pH of the composition of the present invention is adjusted to 7.5 to 10.0. However, this is achieved spontaneously unless particularly acidic substances are added. A pH of 10.0 or more is not preferred because storage stability is impaired. Although the composition of the present invention is a very stable aqueous liquid during storage,
It is presumed that the effective leakage prevention effect is exhibited when the crack reaches the cracked part of the concrete structure for the following reasons. Of course, the present invention is not limited by such a reasoning.

The compositions of the present invention are particularly effective in preventing concrete from leaking water. In order to apply the composition of the present invention to a water leaking part such as concrete, the composition may be applied or poured into the water leaking part by ordinary means. The silica sol maintains an extremely stable colloidal state in the composition of the present invention, but when the highly fluid composition of the present invention permeates through the gaps in the surface layer and reaches the crack site of the concrete molding, the concrete molding is performed. Coagulation occurs due to the surface basicity of the product. At this time, the calcium-coagulable water-soluble polymer in the composition reacts with the calcium component on the concrete surface to form a water-insoluble coagulate, wraps the coagulated and precipitated silica gel particles, adheres tightly to the crack site of the concrete, and fills it. Since the hybrid composed of the silica gel and the agglomerated polymer is a deformable water-insoluble substance, once formed in a fine crack, it follows the crack even if the crack may expand in the future, Later intrusion of water can be prevented for a long time. The higher fatty acid sodium used in the second aspect of the present invention improves the permeability of the composition by its surface active effect, and is oriented on the concrete surface to form a water-repellent layer. As a result, the water leakage preventing property is further ensured.

[0010]

The present invention will be described below with reference to examples.

Example 1 A 0.2% aqueous solution of sodium polyacrylate ("Panakayak" manufactured by Nippon Kayaku Co., Ltd.) was prepared as a calcium-aggregating water-soluble polymer. To 5 liters of this solution, 1.5 liters of silica sol (“Snowtech 30” manufactured by Nissan Chemical Industries, Ltd.) was added with stirring. The whole was adjusted to 10 liters by adding water to obtain a composition of the present invention corresponding to claim 1. The contents of sodium polyacrylate and silicic anhydride in the composition are 0.1% and 4, respectively.
5%. The composition was allowed to stand at room temperature for 6 months, but was stable and did not show any sediment.

Example 2 A 0.2% aqueous solution of sodium alginate was prepared. To 5 liters of this solution, 1.5 liters of silica sol (“Snowtech 30” manufactured by Nissan Chemical Industries, Ltd.) was added with stirring. Water was added to make up the whole to 10 liters, and another composition of the present invention corresponding to claim 1 was obtained. The contents of sodium alginate and silicic anhydride in the composition were 0.1% and 4.5%, respectively. The composition was allowed to stand at room temperature for 6 months, but was stable and did not show any sediment.

Example 3 15 g of sodium polyacrylate ("Panakayak" manufactured by Nippon Kayaku Co., Ltd.) powder and 300 g of powdered soap were dispersed in 300 ml of ethanol, and water was gradually added to 6 liters with stirring. . 250 ml of silica sol ("Snowtex 30" manufactured by Nissan Chemical Industries, Ltd.) was added thereto, and water was added to adjust the whole to 10 liters. Thus, a composition of the present invention corresponding to claim 2 was obtained. The contents of the soap, sodium polyacrylate and silicic anhydride in the composition were 3%, 0.15% and 0.75%, respectively.
The composition was allowed to stand at room temperature for 6 months, but was stable and did not show any sediment.

Comparative Example A A 0.2% aqueous solution of sodium polyacrylate (“Panakayak” manufactured by Nippon Kayaku Co., Ltd.) was prepared and used as Comparative Example A. Comparative Example B 3 ml of Citakasol ("Snowtex 30" manufactured by Nissan Chemical Industries, Ltd.) was diluted to 100 ml with water, and anhydrous silica 0.9
% Was prepared as Comparative Example B. Comparative Example C A composition comprising the following components was prepared according to JP-A-2-294381. Surfactant; powder soap (Miyoshi oil paper) 30 g Hydrophilic paste; sodium polyacrylate (Nippon Kayaku) 3
0 g, aqueous varnish (Asahipen) 20 g, and vinyl acetate emulsion resin (Cemedine) 20 g. Water-insoluble powder; wood powder 100 g, clay 30 g, and superabsorbent polymer (Nippon Shokubai Chemical Co., Ltd. “Aquaric CA”)
10 g. Water; 4800 g. When this composition was left at room temperature for 6 months, a muddy sediment was observed.

Evaluation Example Using a mixture of cement 1 and sand 2, inner diameter 40 mm, inner height 3
A cup having a thickness of 0 mm and a thickness of 10 mm was formed. The cup was cut in half vertically with a cutter and reassembled, and the outer periphery was wrapped and fixed with vinyl tape to obtain a test cup. When 20 ml of water was poured into the test cup, the water flowed out within 10 seconds. The six test cups were immersed in water for 20 minutes and then taken out. The compositions of Examples 1, 2, 3, and Comparative Examples A, B, and C were added 20 ml each while being wet and left for 1 hour. In Examples 1 and 2 and Comparative Example C, the composition did not flow out. Example 3 eluted about 1 ml. Almost all of Comparative Examples A and B flowed out. The contents remaining in the six test cups were poured away, and 20 ml of water was added to each of the test cups in a wet state and allowed to stand.

The cups treated in Comparative Examples A and B immediately leaked, and all of the water flowed out within 30 seconds. Example 1,
In Examples 2 and 3, and Comparative Example C, no water leakage occurred even when left overnight. A disc-shaped rubber plate having a diameter of 40 mm and a thickness of 2 mm was laid at the bottom of the inner surface of each of the four test cups having similar cracks, and a disc made of foamed polyurethane having the same diameter and a thickness of 5 mm was inserted. To these cups, 20 ml of the compositions of Examples 1, 2, and 3 and Comparative Example C were added and left for 1 hour. No liquid leakage was observed from any of the cups. Discard the composition in the cups, wash with running water for 5 minutes, and add water 2 to each cup.
0 ml was added and left for 24 hours.

No water leakage was observed in the cups treated in Examples 1, 2 and 3. However, the cup treated in Comparative Example C showed water leakage. When the rubber plate was removed from the cup and observed, the water-insoluble powder did not reach the crack site of the cup. The rubber plate was removed from the test cups treated in Examples 1, 2 and 3, and the inner surface thereof was flushed with strong jet water.
It was washed for 0 minutes and dried in a dryer at 60 ° C. for 24 hours.
20 ml of water was added to each, and the mixture was allowed to stand. Seven hours later, a few drops of water were observed in the cups of Examples 1 and 2, but no water leakage was observed in the cup of Example 2. When the cracks in the cup were disassembled and examined closely, the gel treated in Example 1 had a gel-like material having a bottom thickness of about 2 mm deep, and the cup was treated in Example 2.
In the case of Example 3, it was generated over 5 mm or more, and the effect of preventing water leakage was ensured.

[0019]

According to the present invention, a rain-leakage inhibiting composition having improved storage stability and crack penetration while maintaining the effect of preventing rain-leakage is obtained.

Claims (2)

(57) [Claims] An osmotic water leakage preventing composition comprising a silica sol, a calcium-coagulable water-soluble polymer and water. 2. The composition according to claim 1, further comprising sodium higher fatty acid.