JP2622027B2 - Bituminous coating waterproofing composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION << Industrial Application >> The present invention relates to a bituminous coating and waterproofing composition used for the purpose of waterproofing, moistureproofing, rustproofing, filling, etc. on the interior and exterior of civil engineering and building structures.

<< Conventional technology >> Bitumen products have been widely used as waterproofing materials because of their good adhesion and self-sealing properties, and they are inexpensive and economical, and are widely used in civil engineering and building structures. It is used.

As a method of applying such a bituminous material, a method of spraying a heated and melted bituminous material or rolling a mixture of the heated and melted bituminous material with an aggregate, etc. is adopted. ing.

However, in these methods, since a high-temperature bitumen material that is heated and melted is handled, there is a problem that generation of an odor becomes a problem, a risk of fire, and a risk of burns of an operator.

On the other hand, there is a cooling method using a bitumen emulsion prepared by emulsifying a bitumen alone or a bitumen emulsion prepared by using a latex or an emulsion in combination with this bituminous emulsion. This cooling method is a method of applying or spraying bitumen emulsions at normal temperature and hardening them by applying them to the construction object, and there is no need to heat and melt the bituminous substances, so the molten high-temperature bituminous substances are not handled. No odor or fire / burn hazard.

<< Problems to be Solved by the Invention >> However, bitumen emulsions employed in the above-mentioned cooling method are generally liable to cause poor curing at low temperatures,
Water and raindrops may cause whitening, outflow, swelling, and the like. Further, at high temperatures, there is a problem that blisters and cracks are easily generated in the coating film due to rapid surface drying.

The present invention has been made in view of the above circumstances, and can be applied to a cooling method, can be cured in a short time, and is free from odors, burns, and fires. Poor curing, whitening and outflow due to water and raindrops,
It is an object of the present invention to provide a bituminous coating waterproof composition which does not cause problems such as blistering of a coating film at high temperatures.

<< Means and Actions for Solving the Problems >> To achieve the above object, the bituminous coating and waterproofing composition of the present invention comprises a bitumen emulsion (A), cement or a mixture of cement and an inorganic filler (B), And a metal acrylate and a polymerization catalyst (C).

It is characterized by comprising a bitumen emulsion (A), cement or a mixture of cement and an inorganic filler (B), and a metal methacrylate and a polymerization catalyst (C).

It further comprises a bitumen emulsion (A), cement or a mixture of cement and an inorganic filler (B), and a metal acrylate, metal methacrylate and a polymerization catalyst (C).

According to the above configuration, there is no need to heat and melt bituminous materials, and it is not affected by external conditions such as temperature and humidity at the time of construction or drying and wetting of the construction base. It is possible to obtain a bituminous coating waterproof composition capable of forming a defect-free thick film without whitening or outflow.

The bituminous emulsion (A) used in the present invention may be a single substance such as petroleum asphalt, natural asphalt, Gilsonite, coal tar, pitch or the like, or a mixture thereof, selected from anionic, nonionic and cationic surfactants. Single emulsion prepared as an emulsion using
Or, the emulsion prepared in this manner and a latex composed of synthetic rubber such as SBR, CR, IR, or a synthetic resin emulsion composed of ethylene-vinyl acetate copolymer, acrylic resin, PVC, vinylidene chloride, PVA, or the like, or This is a mixture emulsion in which a mixture is used in combination.

As the bituminous emulsion (A) used in the present invention, those containing 20% by weight or more of solids can be used, and those containing 50% by weight or more of solids are particularly preferable. The proportion of the bituminous emulsion (A) in the bituminous coating and waterproofing composition is 30 to 90 parts by weight, preferably 60 to 80 parts by weight.

The cement or cement and the inorganic filler (B) used in the present invention may be ordinary Portland cement, early-strength Portland cement, ultra-high-strength Portland cement, blast-furnace cement, silica cement, ultra-rapid hardening cement or the like. Or a mixture of the above cement and an inorganic filler consisting of calcium carbonate, talc, clay, gypsum or the like alone or a mixture thereof.

The proportion of the cement or the mixture of the cement and the inorganic filler (B) used in the present invention in the bitumen-coated waterproofing composition is 5 to 50 parts by weight, preferably 20 to 40 parts by weight.

Further, the metal acrylate, metal methacrylate and the polymerization catalyst (C) used in the present invention are salts of an alkaline earth metal with acrylic acid or methacrylic acid, such as magnesium acrylate, calcium acrylate, and the like. Magnesium methacrylate, calcium methacrylate, etc.
Alternatively, zinc acrylate, aluminum acrylate, zinc methacrylate, aluminum methacrylate and the like can be mentioned. The polymerization catalyst is preferably composed of a combination of an oxidizing agent and a reducing agent, and is preferably water-soluble. Examples of the oxidizing agent include sodium, potassium, and ammonium persulfates. Examples of the reducing agent include sodium bisulfite, sodium sulfite, sodium thiosulfate, dimethylaminopropionitrile, triethanolamine, nitrilotrispropionamide,
Examples include sodium isoascorbate, morpholine, Rongalit, and citric acid.

The proportion of the metal acrylate or metal methacrylate in the bituminous coating waterproof composition of the metal acrylate, metal methacrylate and the polymerization catalyst (C) used in the present invention is in the range of 1 to 20 parts by weight. In particular, 5 to 15 parts by weight is suitable.

The bituminous coating and waterproofing composition of the present invention is characterized in that it cures in a short period of time, and spray spray coating is preferred for its application.

<< Examples >> Examples of the present invention will be described in detail below.

Example 1 100 parts by weight of SBR-based asphalt emulsion (solid content: 75%)
40 parts by weight of ordinary Portland cement was added and mixed with stirring until the mixture became sufficiently homogeneous. Next, 1 part by weight of 5 g of sodium persulfate dissolved in 100 g of water was added to the above mixture, followed by stirring and mixing. Further, 5,10,20 parts by weight of 0.6 g of nitrilotrispropionamide dissolved in 100 g of a 30% aqueous solution of magnesium acrylate were added to each of the above mixtures, and the mixture was stirred and mixed. Coating gave a bituminous coated waterproofing composition.

When the bituminous waterproof composition was immediately immersed in water, there was no outflow of the bituminous waterproof composition.

The above test was carried out at 5 ° C. and 25 ° C., with similar results.

Comparative Example 1 100 parts by weight of SBR asphalt emulsion (solid content: 75%)
40 parts by weight of ordinary Portland cement was added, and the mixture was stirred and mixed until sufficiently homogeneous, and immediately applied to a glass plate so as to have a thickness of 3 mm to obtain a bituminous coating waterproof composition.

When this bituminous waterproof composition was immediately immersed in water, the bituminous waterproof composition flowed out.

Example 2 100 parts by weight of SBR-based asphalt emulsion (solid content: 75%)
40 parts by weight of ordinary Portland cement was added and mixed with stirring until the mixture became sufficiently homogeneous. Next, 1 part by weight of 5 g of sodium persulfate dissolved in 100 g of water was added to the above mixture, followed by stirring and mixing. Further, 20 parts by weight of 0.6 g of nitrilotrispropionamide dissolved in 100 g of a 30% aqueous solution of magnesium acrylate are added to the above mixture, and the mixture is stirred and mixed.
Immediately on a glass plate so as to have a thickness of 3 mm, a bituminous waterproof composition was obtained.

 The characteristics are shown in Table 1.

Comparative Example 2 100 parts by weight of SBR asphalt emulsion (solid content: 75%)
40 parts by weight of ordinary Portland cement was added, and the mixture was stirred and mixed until sufficiently homogeneous, and immediately applied to a glass plate so as to have a thickness of 3 mm to obtain a bituminous coating waterproof composition.

 The characteristics are shown in Table 1.

As described above, the bituminous coating and waterproofing composition obtained by the present invention does not cause problems such as odor, burns, and fire at the time of application, and can provide a waterproofing layer in a short time even at a low temperature. It also has excellent resistance to rainfall.

<Effects> As described above, the bituminous coating and waterproofing composition of the present invention can be applied to a cold method and can be cured in a short time. Therefore, there is no fear of odor, burns, and fire. Problems such as poor curing at the time, whitening and outflow by water and raindrops, and blistering of the coating film at high temperatures can be solved.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Yoshimasa Hayashi 4-640 Shimoseito, Kiyose-shi, Tokyo Co., Ltd. Inside the Obayashi Corporation Technical Research Institute (72) Haruka Ogawa 4-640 Shimoseido Shimito-shi, Tokyo (72) Inventor Kiyoshige Nishibayashi, Ltd. 4-640 Shimoseito, Kiyose-shi, Tokyo, Ltd. Inside

Claims (3)

(57) [Claims] 1. A bitumen-coated waterproofing composition comprising a bitumen emulsion (A), cement or a mixture of cement and an inorganic filler (B), and a metal acrylate and a polymerization catalyst (C). Composition. 2. A bitumen-coated waterproofing composition comprising a bitumen emulsion (A), a cement or a mixture of cement and an inorganic filler (B), and a metal methacrylate and a polymerization catalyst (C). Composition. 3. A composition comprising a bitumen emulsion (A), cement or a mixture of cement and an inorganic filler (B), and a metal acrylate, metal methacrylate and a polymerization catalyst (C). Bituminous applied waterproofing composition.