KR910004679B1 - Process for the preparation of water proofing agent - Google Patents

Abstract

The water-proofing doping agent is prepared by (1) making a polymeric colloidal solution of uncrosslinked polydimethylsiloxane (ASTM D-1418 polymer classification VMQ) in an organic solvent (mineral spirit, kerosene or their mixture), and (2) mixing the above solution and a gelled reaction product of aluminum stearate and an aromatic solvent (toluene, xylene or their mixture). The doping agent has a good durability and permeability.

Description

Manufacturing method of permeable coating waterproofing agent

The present invention provides an uncrosslinked polydimethyl siloxane, which is an elastic body, to a kerosene or mineral spirit in order to impart waterproofness to a part necessary for a building, particularly a red brick wall, a cement mortar wall, an aqueous paint wall, a rooftop, a tile roof, a slate roof, and wood. The present invention relates to a method for preparing a new and advanced permeable coating waterproofing agent having excellent permeability, good durability and waterproofness, which is prepared by mixing a gelled solution by reacting aluminum stearate with toluene or xylene in a dissolved solution.

Although various kinds of permeable coating waterproofing agents are commercially available in the market, many problems are exposed in the effect and durability. That is, the permeable coating waterproofing agents such as polystyrene, polyvinyl chloride and aqueous solution vinyl chloride, and vinylidene chloride emulsion, which are mainly used, bring unnatural luster to the building when applied to the exterior walls or roofs of buildings. The effect is to easily age, shorten the life and easily weather and lose its performance.

In addition, the permeable coating waterproofing agent diluted with toluene, xylene, mineral spirit, etc., which is widely used and thought to be the most reliable, is durable as the resin itself, but the physical adhesion of the silicone resin molecule with the three-dimensional network structure with the inorganic material of the building wall It is usually weak and loses its water-repellent performance within two to three years due to light vibrations and impacts on buildings. On the other hand, since the solvent type uses a large amount of aromatic solvents such as benzene, toluene, and xylene, it is not only harmful to the human body but also causes swelling or discoloration of the paint wall.

For example, the silicone resin solvent-type permeable coating waterproofing agent Aqua Seal (trade name) manufactured by Nippon Steel Chemical Co., Ltd. and Liquid Plastic (trade name) manufactured by EL, P., and I., UK, are swelling of the wall surface when sprayed on the paint wall due to the use of petroleum solvents. It causes discoloration.

See also Blumental's data [W.B. Blumental, Ind. Eng.chem. 42, 640 (1950)], emulsion-type permeable coating waterproofing agent based on paraffin wax, although the production price is low, most of the yellowing phenomenon occurs due to the emulsifier effect, and the effect is long lasting due to weak wear resistance. It is not known. According to Schönberg's improved data (EG Hochberg and Associates, Waterproofing Agent, A Marcketing Technical study, Chester, NJ, 1976, pp 111-127), the permeable coating waterproofing agent has excellent performance in many ways. However, there is a disadvantage that the price is much higher than other products. Among these points, silicone resin has a large contact angle to water due to the influence of methyl groups, but its chemical structure is three-dimensional network structure, which has a weak contact force due to the low contact surface with inorganic spheres of building walls. The structure of the good silicon is used as it is, but only to increase the bonding force with inorganic spheres such as concrete, the invention has been invented a permeable coating waterproofing agent having a good performance than expected.

The permeable coating waterproofing agent of the present invention is red brick wall, water paint wall, cement mortar wall, artificial and natural stone, PALC (Precastable Autoclaved Light Ceramic), cement tile, clay tile, slate, cement block, gypsum board, tiles It is a permeable waterproofing agent for building that gives a waterproof and water repellent effect by simply spraying, brushing, lorbarium, and dipping. Concrete structures are exposed to moisture due to the outflow of slaked lime [Ca (OH) ₂ ], hardening of the structure, and air holes which are generated during hardening shrinkage, resulting in the appearance of whitening on the outer wall, mold on the inner wall, and weathering. Not only harm, but also shorten the life. However, when the waterproofing agent of the present invention is not used, there is no change in the color of the exterior, but rather, it protects the outer wall of the gun, lengthens the life and prevents the passage of water, but the air circulation is free, which prevents mold habitats, dust, Even dirt can be cleaned by rainfall to keep the vivid primary color longer.

In addition, the main raw material of the waterproofing agent itself is a long elastic molecule which is a flexible elastic body, not a hard resin, and penetrates deeply into the inorganic material of the building sphere, and the diluent evaporates and the flexible molecule sticks and wraps to show strong binding force. It is a (-Si-O-Si-) repeating unit and has strong resistance to oxygen, ozone and ultraviolet rays. On the other hand, the linear cross-linked elastic body attached to the inorganic spheres has a large contact angle with water due to the methyl group doubling outwards, so that raindrops do not stick to the walls and fall down in rainy weather.

The present invention is made of polydimethylsiloxane (ASTMD-1418, Polymer Clsddificston VMQ uncrosslinked elastomer, aka silicone rubber) and aluminum stearate as the main raw materials, and after reacting aluminum stearate with a small amount of toluene, xylene, etc. It is then used by dispersing in the silicone rubber solution (polymer polymer solution) dissolved in kerosene or mineral spirit. As a result, during construction, if it penetrates into the construction surface quickly and the solvent is volatilized, the solid content adheres by the material and the physical adhesion of the construction surface to change the surface tension, thereby exhibiting waterproof performance.

In detail, the manufacturing method of the present invention reacts aluminum stearate with toluene or xylene, and then mixes the unvulcanized polydimethylsiloxane, that is, silicone rubber with a polymer colloidal solution using mineral spirit, kerosene or a mixture thereof.

Conventional silicone resin-type permeable coating waterproofing agent is obtained by diluting a cross-linked resin in an aromatic solvent with a three-dimensional network structure, so that physical resilience between the building sphere and the silicone resin molecule is extremely weak. Although it has a weakness to desorb from the polydimethyl siloxane of the present invention is a linear flexible polymer is very strong because it adheres to the sphere is characterized by having excellent durability and excellent performance.

In order to know the effect of the permeable coating waterproofing agent of the present invention, commercially available aqua seals (trade name, manufactured by Nippon Steel Chemical Co., Ltd.) and vinyl chloride, vinylidene chloride permeable coating waterproofing agent [polymer waterproofing, polymer publishing] ), P. 143 (1972)] and the waterproofing agent of the present invention according to the Korean Industrial Standard KSF2451 (Testing Method for Construction Cement Waterproofing Agent) are shown in Table 1 below. It can be seen that the characteristics are remarkably excellent in absorption ratio, permeability ratio and the like.

TABLE 1

Test score comparison table

* Test method: KSF: KSF-2451 (Test method for building cement waterproofing agent)

The following examples illustrate the present invention in more detail but are not intended to limit the scope thereof.

Example 1

4 kg of uncrosslinked polydimethylsiloxane (silicone rubber) was added to 100 l of mineral spirits to make a uniform colloidal solution. Then, 1 kg of aluminum stearate was reacted with 20 l of xylene at 50-80 ° C., mixed and stirred for 30 minutes. 40g of dicumyl peroxide dissolved in aged acetone was added to cement wall, red brick wall, water paint wall, artificial or natural stone, and dried for 24 hours. The primary color was maintained without any change of surface. Performance was shown.

Example 2

The same result was obtained using what was melt | dissolved in kerosene instead of the mineral spirit of Example 1.

Example 3

Toluene was used instead of xylene of Example 1 to obtain the same result.

Example 4

The same result was obtained using benzoyl peroxide instead of the dicumylperoxide of Example 1.

Example 5

The same result was obtained using the mixture liquid of kerosene instead of the mineral spirit used alone of Example 1.

Example 6

The same results were obtained without the reaction solution of aluminum stearate and xylene of Example 1.

Example 7

The same result was obtained without dicumyl peroxide dissolved in acetone of Example 1.

Example 8

The same result was obtained using bis (2,4-dichlorobenzoylperoxide) instead of the dicumylperoxide of Example 1.

Claims (3)

It is prepared by preparing uncrosslinked polydimethylsiloxane (ASTM D-1418 polymer classification, VMQ) as a polymer collide solution in an organic solvent and then gelling the solution by reacting aluminum stearate with an aromatic solvent. Method for producing a permeable coating waterproofing agent. The method for producing a permeable coating waterproofing agent according to claim 1, wherein mineral spirit, kerosene or a mixture thereof is used as an organic solvent. The method for producing a permeable waterproofing agent according to claim 1, wherein toluene, xylene or a mixture thereof is used as the aromatic solvent.