JPH0536468B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a two-component instant-setting coating composition, and more particularly to a two-component instant-setting coating composition that uses an anionic asphalt emulsion and an acrylic resin emulsion and is particularly suitable for spray mixing. . Two-component instant-setting adhesives are known that consist of a main agent based on an acrylic resin emulsion and a curing agent based on a polyvalent metal salt, but since the main purpose of such adhesives is adhesion, It has excellent adhesion, or tackiness, and can be used as a waterproof coating layer,
It cannot be used for applications such as buffer coating layers, joint materials, and protective base materials for vehicles and structures. Therefore, the present inventor conducted intensive research on a two-component instant-hardening coating composition that can be used for the above applications, and found that an anionic asphalt emulsion was added to the main ingredient based on the acrylic resin emulsion. The present inventors have discovered that a coating composition capable of forming a flexible coating layer with excellent mechanical strength and water impermeability can be obtained by doing so, and have completed the present invention. According to the present invention, the present invention is characterized in that it consists of (a) a first liquid containing anionic asphalt emulsion and an acrylic resin emulsion as main components, and (b) a second liquid consisting of an aqueous solution of an inorganic polyvalent metal salt. A two-part instant-setting coating composition is provided. In the composition of the present invention, the "anionic asphalt emulsion", which is one of the main components of the first liquid (base ingredient), is a product obtained by emulsifying and finely dispersing asphalt in an aqueous medium using an anionic surfactant. As the asphalt, straight asphalt, blown asphalt, solvent-deasphalted asphalt (for example, propane-deasphalt asphalt), natural asphalt, etc. are used. Also,
Examples of anionic surfactants used to emulsify and finely disperse asphalt include higher fatty acid metal salts such as sodium lauryl sulfate, sodium stearate, and sodium oleate; sodium lauryl sulfate and sodium cetyl sulfate. salt, stearyl sulfate sodium salt, oleyl sulfate sodium salt, lauryl ether sulfate sodium salt [C ₁₂ H ₂₅ O (CH ₂ CH ₂ O) _o SO ₃ Na, n=2
~4], sulfate ester salts such as α-olefin sulfonate; sulfonates such as sodium alkylbenzenesulfonate and sodium dodecylbenzenesulfonate; alkali metal salts of petroleum sulfonates; naphthenates (e.g.

[Formula]); resin acid salt; or a combination of two or more of these, or a combination of these with clay, bentonite, etc. The anionic asphalt emulsion used in the present invention can generally have a PH in the range of 7 to 11, preferably 8 to 10, and generally have a solids content of 40 to 80% by weight, preferably 50 to 60%. weight%
can be in the range of Such anionic asphalt emulsion is usually produced by heating asphalt until it has a viscosity of about 2 poise, and heating an aqueous solution of the anionic surfactant as described above to a temperature of about 70 to about 80°C. By treating both at the same time with a homogenizer, such as a Harrell homogenizer (the gap between the rotor and stator is preferably about 0.008 to 1.0 mm), the asphalt can be made into fine particles in an aqueous solution of an anionic surfactant, and an emulsion can be obtained. There are also commercially available products such as "Flint Coat" manufactured by Shell Sekiyu Co., Ltd., and others.
It is also easily available as a product equivalent to JIS K2208 MA-1 and MA-2. As the "acrylic resin emulsion", which is another main component of the second liquid, a type in which acrylic resin is emulsified and finely dispersed in an aqueous medium using an anionic or nonionic surfactant is suitable. As the acrylic resin, those commonly used in acrylic resin emulsion paints can be similarly used, such as acrylic acid alkyl esters such as methyl acrylate, ethyl acrylate, butyl acrylate, and 2-ethylhexyl acrylate. A homopolymer of or a copolymer of two or more of these acrylic esters,
Alternatively, copolymers containing the acrylic acid alkyl ester as a main component with other monomers are included. Particularly suitable is an acrylic resin emulsion whose main resin component is a butyl acrylate homopolymer. Such acrylic resin emulsions generally have a
10, preferably in the range of 7 to 9, and the solids content is generally 45 to 70% by weight,
It can preferably range from 55 to 65% by weight. The blending ratio of the anionic asphalt emulsion and the acrylic resin emulsion in the second liquid (main ingredient) can be changed depending on the use of the final product, the type of these emulsions, etc., but in general, the ratio of the anionic asphalt emulsion to the acrylic resin emulsion is
Solid content weight ratio of acrylic resin emulsion,
A range of 1/10 to 9/1, preferably 6/4 to 4/1 is convenient. In addition, the total concentration of asphalt and acrylic resin in the second liquid is generally 40 to 70% by weight, preferably 50% by weight.
It is preferable to blend the anionic asphalt emulsion and the acrylic resin emulsion so that the amount is in the range of 60% by weight. The second liquid may further contain silicone antifoaming agents such as organopolysiloxane, aggregates such as silica and talc, carboxymethyl cellulose, hydroxyethyl cellulose, asbestos powder, and alkaline thickeners (sodium polyacrylate) as necessary. A thickener such as a compound) may be added. Generally, the aggregate can be blended in a proportion of 5 to 25% by weight based on the total weight of the anionic asphalt emulsion and the acrylic resin emulsion, and the thickener can be blended in a proportion of 0.1 to 10% by weight. be able to. Next, the inorganic polyvalent metal salt used in the second liquid (curing agent) of the present invention is a metal salt that dissolves in water and dissociates metal ions with a divalent or higher charge. Examples include iron, ferric chloride, alum, aluminum chloride, magnesium chloride, barium chloride, cadmium chloride, copper sulfate, manganese chloride, zinc chloride, calcium chloride, etc., each of which may be used alone or in combination of two or more. can be used. These polyvalent metal salts can be dissolved in an aqueous medium, usually water, to form a second solution. The concentration of the polyvalent metal salt in this second liquid can be varied depending on the type of metal salt and the type of second liquid used, but it is generally in the range of 1 to 30% by weight, preferably 3 to 7% by weight. It is appropriate to When the first liquid and the second liquid described above are mixed, they instantly solidify (gel) to form a coating film that does not sag. Therefore, it is necessary to mix the first liquid and the second liquid in the air (spray mixture) using, for example, a double-headed spray gun at the coating site, and apply the mixture onto the adherend. The mixing ratio of the first liquid and the second liquid at that time is not strictly limited and can be varied widely depending on the type of the first liquid and the second liquid, but in general, the weight of the first liquid/second liquid is The ratio is approximately 5/1 to 10/
1, preferably 8/1 to 9/1. The composition of the present invention is generally applied to a wet thickness of about 2 to about 8 mm, particularly about 4 to about 6 mm, depending on the application, and is flexible, has high mechanical strength, and has excellent waterproof properties. A film can be formed. Thus, the coating composition of the present invention does not sag during painting, and also allows easy separation of free water and dries quickly. It is applied as a primer, and then the first liquid and the second liquid are spray-coated on top of it (the coating thickness is usually preferably in the range of 4 to 6 mm wet, but depending on the situation it may be about 10 mm).
(2) As a buffer material (stress isolation layer) for tunnels, the composition of the present invention is applied wet to a thickness of about 2 to 6 mm on top of the excavated rock, and then concrete is applied. (3) Use it as an on-site construction type joint material with good elongation and adhesive strength at break; or (4) Vehicles.
It can be used as a protective underbody material for foundations and pile bodies of various structures. Particularly in the case of application (4) above, hot melt asphalt and asphalt sheets have been used in the past, but they had the disadvantage of extremely low work efficiency when working on objects with complex shapes. Since the composition of the invention can be easily applied with a double-headed spray gun, work efficiency can be greatly improved. Next, the present invention will be further explained by examples. Example 1 Preparation of the first liquid: Prescription Anionic asphalt emulsion (Flint Coat FL: manufactured by Shell Sekiyu) 60 parts by weight Acrylic resin ester emulsion (Primal N-580: manufactured by Rohm & Haas)
40 parts by weight Defoamer (SN-Defoamer 5016: manufactured by San Nopco) 0.4 parts by weight The above components were mixed and stirred with a propeller mixer until uniform. The properties of the thus obtained first liquid were as follows. Hue: Dark brown PH: 8.3 Specific gravity: 1.0 (25°C) Solid content: 55% by weight Viscosity: 100 cps (25°C) Preparation of the first solution: Dissolve calcium chloride in water to make a 5% aqueous solution of calcium chloride. The first and second liquids prepared above were charged into an airless type outmix sprayer made by Nippon Gray, and the primary pressure was 2.5~2.5 using a dual gun.
When the paint was sprayed onto the surface of the base material (concrete) at 3Kg/cm ² and a sprayer magnification of 30 times, a soft paint film with little free water was obtained. The properties of the coating film after drying were as follows. Fraas embrittlement point: -37℃ (according to JIS K2207) Tensile strength: 5.1Kgf/cm ² (according to JIS A6021) Tear strength: 4.6Kgf/cm ² (according to JIS A6021) Elongation at break: 1000% (JIS A6021 by)

Claims (1)

[Claims] 1 (a) Anionic asphalt emulsion (A)
and a first liquid containing acrylic resin emulsion (B) as a main component and having a solid content weight ratio of (A)/(B) in the range of 1/10 to 9/1, and (b) a concentration of 1 to 30% by weight. and a first liquid consisting of an aqueous solution of an inorganic polyvalent metal salt within the range of A two-component instant-setting coating composition, characterized in that it is used as a coating composition.