JPS629420B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention mainly relates to improvements in mortar base materials used for external walls of wooden buildings. Traditionally, this type of mortar wall construction was done by placing a waterproof sheet on the wall base, then placing metal lath on top of it and nailing it to serve as the mortar base, and then layering cement mortar over this.
In recent years, mortar base plates have been developed that can be directly coated with mortar, omitting the complicated metal laminate process that requires a lot of labor. As shown in Fig. 1, this type of mortar base plate is prepared by applying waterproof paint to the surface of plywood a and drying it to form a waterproof layer b in advance.
Apply cement mortar on top of the waterproof layer b,
It is known that a cement mortar layer c that has been cured and hardened is formed. However, manufacturing this mortar base board requires time and effort to first apply waterproof paint to plywood a, wait for it to dry, and then apply cement mortar on top of it, which requires double application work. However, the cement mortar layer c must be cured and hardened over a long period of time, resulting in poor production efficiency and a drawback that mass production is not possible. Furthermore,
This product has drawbacks such as poor adhesion between the waterproof paint layer b and the cement mortar layer c, and is susceptible to peeling and cracking due to vibrations and the like. The present invention eliminates the drawbacks of the conventional mortar base plate, and provides a stable and robust mortar base material that is easy to manufacture, suitable for high-efficiency production, and is made of synthetic resin on a wooden or inorganic base plate. A slurry mixture consisting of an aqueous emulsion of resin or/and rubber and asphalt, colloidal silica, and inorganic aggregate is coated and dried to form a coating film. Next, the present invention will be explained with reference to an example of implementation shown in the second figure. 1 indicates a wooden or inorganic substrate, such as plywood, particle board, hard board, wood wool cement board, pulp cement board, slate board, board, calcium silicate board, etc. In the present invention, a mortar base material 3 is provided on the surface of the substrate 1 with a coating film 2 that is rapidly formed into one body by coating and drying a slurry mixture as detailed below. The surface of the coating film 2 may be a smooth surface, but generally a rough surface 2
(a) or, although not shown, by applying pressure with an embossing roller or by other means, a predetermined uneven surface is formed on the smooth or rough surface, and when mortar is applied to the upper surface, the applied mortar becomes an anchor. It is preferable that the mortar be bonded to form a more stable and robust mortar coating. The coating film 2 is made of synthetic resin or/
and quickly obtained by applying and heating drying a slurry-like mixture consisting of an aqueous emulsion of rubber and asphalt, colloidal silica, and inorganic aggregate,
The coating film has excellent impregnation adhesion and binding power to the substrate 1, is hard but strong, and has excellent waterproof properties. Next, the slurry mixture will be explained. The aqueous emulsion is generally prepared by incorporating a synthetic resin or rubber into an asphalt emulsion.
Asphalt emulsion is mainly composed of straight asphalt and has a solid content of 50 to 60% by emulsifying it with water and an emulsifier.
%, has excellent waterproofness, permeability, antiseptic properties, and adhesive properties. As synthetic resin or rubber,
In particular, materials that have good compatibility with asphalt, such as acrylic styrene copolymers, ethylene vinyl acetate resins, acrylic acid ester resins, urethane resins, styrene butadiene rubber, chloroprene rubber, and ethylene propylene rubber, are made into emulsions. The aqueous emulsion is prepared by mixing with an asphalt emulsion, or by mixing it with an asphalt emulsion and then emulsifying it. The amount of synthetic resin or/and rubber added is preferably 5 to 25% in terms of solid content to the asphalt emulsion.
Addition of about % by weight improves the ease of applying the slurry mixture, the elasticity and temperature sensitivity of asphalt, prevents softening and stickiness, and increases adhesive strength. The colloidal silica that is combined with the aqueous suspension is obtained by removing most of the sodium ions from an aqueous sodium silicate solution, resulting in silica polymerizing and becoming a colloid. It eliminates blocking phenomenon, enhances adhesion, provides resistance to the alkalinity of the finishing layer mortar applied thereon, prevents interfacial peeling, and creates a very dense and hard coating. It provides a film, impregnates and adheres to the substrate 1, has very strong binding force, and is useful for improving waterproofness. The amount of colloidal silica to be added is generally 4 to 40 parts by weight per 100 parts by weight of the solid content of the aqueous suspension, and most preferably 10 to 25 parts by weight. . Inorganic aggregates added to these ingredients include ordinary mineral powder, such as silica powder, charcoal, river sand, talc, clay, perlite, shirasu balloons, and inorganic short fibers such as asbestos and glass. Yes, one or more of them are used. Paint film 2
When the surface 2a is particularly rough, an inorganic aggregate with a large particle size, for example 3 to 10 mesh, is used.
The surface of the coating film 2 can also be provided with an uneven surface shape such as a large number of dotted lines by molding. Such a rough or uneven surface provides anchoring properties to the mortar applied to the surface, and is useful for forming a well-bonded mortar coating layer. The amount of inorganic aggregate added is
It is preferably used in an amount of 50 to 200% by weight based on the aqueous emulsion and colloidal silica blend, which helps to improve the strength, impact resistance, weather resistance, coating workability, and adhesion of top coat mortar of the coating film. The slurry mixture thus blended and kneaded is applied to the surface of the base material 1 to a thickness of 0.5 to 2 mm. In this case, it is common to use powder particles or short fibers with a relatively large diameter as the inorganic aggregate, and to form the surface of the coating layer into a rough surface. Gives an uneven surface shape to the surface. Next, this is dried with high efficiency through a hot air drying oven to obtain the mortar base material 3 of the present invention in which the coating film 2 having at least a rough surface 2a is integrally formed on the surface of the substrate 1. . In this manufacturing process, the coating layer of the slurry mixture sufficiently impregnates the substrate 1,
Upon drying, a coating film 3 is obtained which is strongly bonded and has no fear of peeling or cracking. Moreover, the coating film 3 is
It is highly waterproof and does not allow rainwater to enter, and is also antiseptic.
Provides decay resistance. Next, more detailed embodiments of the present invention will be described. A slurry mixture consisting of the following two compositions was applied to a 10 mm plywood board and a slate board at a rate of 2 kg/m ² , respectively, and dried through a hot air drying oven at 80°C to form each mortar base material of the present invention. Manufactured.

【table】

[Table] The properties of these product samples were tested according to the test method of JISA6910 (exterior wall materials for buildings).
The results are shown in Table 1 below.

【table】

[Table] As is clear from the above table, the mortar base material of the present invention passed all of the above characteristics and showed excellent results. As described above, according to the present invention, a coated and dried coating film of a slurry-like mixture containing an aqueous emulsion of synthetic resin or/and rubber and asphalt, colloidal silica, and inorganic aggregate is integrally formed on the substrate surface. Since the mortar base material is composed of a mortar base material, production efficiency is significantly improved, and the mortar base material has an extremely strong bond to the substrate, has excellent crack resistance, is strong and robust, and is highly waterproof and weather resistant. This method has the effect of eliminating the drawbacks of the conventional method.

[Brief explanation of the drawing]

Figure 1 is a partially cutaway perspective view of the conventional product, Figure 2
The figure shows a partially cutaway perspective view of the product of the present invention. 1...Substrate, 2...Coating film layer, 2a...Rough surface, 3
...Mortar base material of the present invention.

Claims (1)

[Claims] 1. A slurry-like mixture consisting of an aqueous emulsion of synthetic resin or/and rubber and asphalt, colloidal silica, and inorganic aggregate is applied to a wood-based or inorganic substrate surface and dried to form a coating film. Mortar base material formed on the body. 2. 4 to 40 parts by weight of colloidal silica is blended to 100 parts by weight of the solid content of the aqueous emulsion, and 50 to 200 parts by weight of inorganic aggregate is added to this mixture.
The mortar base material according to claim 1, which is a dry coating film of a slurry-like mixture obtained by mixing. 3. The mortar base material according to claim 1, wherein the surface of the coating film is a rough surface, an uneven surface, or a combination thereof.