JPH068553B2 - Construction method of wall surface in house - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for constructing a wall surface of a house, and more particularly to an improvement in a method for constructing a wall surface using a wall base plate to which a coated wall coating material can be directly applied.

The surface of the substrate such as plywood or fiberboard is coated with resin paint, adhesive, bituminous substance, etc. mixed with inorganic particles, powder, and lightweight foam particles, and firmly adhered to the surface of the substrate for rough surface roughness. The wall base material on which a coating layer with a surface is formed is nailed to the frame structure of the house such as columns, studs, furrows, etc. without any gaps, and the wall coating material is applied over the entire surface. Proposals for simplifying construction have been made and are being put to practical use.

This method drastically reduces on-site work such as lath underlay, asphalt felt upholstery, lath net up, etc. in conventional wall construction methods, and recoating work such as undercoating, intermediate coating and finish coating. Can be completed with a single finish coating, thus shortening the curing period,
This has resulted in a significant reduction in overall work volume for wall construction, a significant reduction in work time, and improved workability.

In addition, the physical shape of the coating layer formed on the surface of the wall base plate, the chemical composition, and the appropriate selection of the coating wall coating material to be applied to the surface can improve the adhesion between them. Since it was significantly improved, it had the effect of restraining the initial drying shrinkage of the wall coating material by the dissipation of water in the wall coating material and preventing and suppressing the occurrence of shrinkage cracks accompanying the initial drying. .

However, it was found that after initial drying, as the drying further progressed, fine cracks called hair cracks appeared on the wall surface.

Various large and small capillary voids are formed in the painted wall tissue after initial drying, and the water in the painted wall tissue evaporates because the water in the relatively large capillary voids moves in the painted wall tissue. The water in the small capillary voids then evaporates. The water in such a capillary void causes a large surface tension, and this stress acts in the direction to reduce the capillary void, so that it exerts a contracting action on the wall tissue, which is the cause of the hair crack. It was

For the purpose of preventing cracks due to drying shrinkage of the wall coating material, a method of mixing an expansive admixture suitable for the drying shrinkage into the wall coating material has been considered, but this method is for preventing cracks due to initial drying. Although it was effective, it was not possible to prevent hair cracks. The present invention aims to provide a wall construction method for preventing hair cracks that occur after initial drying.

In the present invention, as the wall coating material, a mixture of cement and aggregate mixed with kneading water obtained by mixing emulsion of nonionic surfactant and synthetic resin or latex and water is used. As a result, hair cracks can be largely prevented. In particular, it has been found that good results can be obtained by using a nonionic surfactant having a molecular weight of 1000 or less and an HLB value in the range of 5 to 15.

The amount of the nonionic surfactant added is preferably 0.5 to 8% by weight with respect to the amount of cement in the wall coating material.

The substrate used for the wall base plate is an organic plate such as plywood, fiber board, wood shaving board, gypsum board, cement board, and calcareous board, an inorganic board, or a board formed of an organic and inorganic material, or a combination thereof. It may be a composite plate in which plate-like bodies are combined, and those substrates may have two sides or four as needed.
It is used that the edge of the edge is chamfered, trimmed, and actual processed, and the surface of the substrate is optionally subjected to a surface treatment such as a sealer treatment and a waterproof treatment.

The coating layer formed on the substrate surface of the wall base plate may be one or more selected from the group consisting of a solution or emulsion of synthetic resin, a latex solution of natural rubber or synthetic rubber, and a methyl cellulose solution, if necessary. Dispersant, defoaming agent, thickener, surfactant, etc. are added, and if necessary, a coating material containing inorganic material powder, particles, and expanded particles is applied,
Or bituminous or bituminous and synthetic resin or bituminous paint with atactic component added to it, or these bituminous paints with inorganic powder, particles, or foamed particles mixed as necessary. , Dried and formed. This surface may be relatively smooth or may be a rough surface having large irregularities.

The wall foundation plate as described above is nailed and fixed to a frame structure of a house such as a pillar, a stud, and a furring strip to perform a wall foundation treatment. In the wall foundation treatment, the caulking agent is further filled in the butt joints of the wall foundation plate,
Perform joint treatment. After the caulking agent is filled, the joint portion may further include fixing a mesh-like joint sheet such as a gauze cloth, a glass fiber net, and a wire mesh with a stapler or the like.

Then, the mixture of cement and aggregate is mixed with non-ionic surfactant and kneading water obtained by mixing emulsion or latex of synthetic resin with water, and mixed to prepare a wall coating material, which is then iron coated. , Spraying, etc., is applied to the entire surface of the wall base including the joints.

The cement used is Portland cement,
It is a commonly used cement such as white cement.

As the aggregate, sand, calcium carbonate, silica sand, pearlite, or the like is used.

As the nonionic surfactant, polyoxyethylene alkyl ether, polyoxyethylene, polyoxyethylene alkylphenol ether, sorbitan fatty acid ester, oxyethylene, oxypropylene, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene alkylamine, polyoxy Ethylene fatty acid ester, glycerin fatty acid ester, glycerin ester,
Polyoxyethylene higher alcohol ether and the like are used, and those having a molecular weight of 1000 or less and an HLB value in the range of 5 to 15 are preferable. When the molecular weight is 1000 or more, it becomes difficult to dissolve in water, and it is difficult to enter the capillary structure yet, and the effect of preventing hair cracks is reduced. Also, when the HLB value is 5 or less, the surfactant itself becomes highly lipophilic and acts as an antifoaming agent, eliminating the bubbles generated during kneading with cement, and the trowel separation during trowel coating becomes poor and workability is improved. In addition, the lower layer mortar itself becomes more hydrophobic during splicing, which hinders adhesion to the splicing mortar and reduces the adhesive strength. Further, when the HLB value is 15 or more, the hydrophilicity of the surfactant itself becomes large, so that the surfactant acts as a foaming agent and foams more than necessary when kneading with cement, resulting in a decrease in strength of the mortar itself. If an anionic surfactant is used instead of a nonionic surfactant, it will be adsorbed on the surface of the cement particles, so that the penetration into the capillary structure will be poor, which will slow the hardening of the cement itself and The wall coating material is likely to dry out, leading to a decrease in mortar strength.

A suitable amount of the nonionic surfactant added is 0.5 to 8% by weight. If it is less than 0.5%, the effect of preventing hair cracks decreases, and if it exceeds 8%, an effect proportional to it cannot be expected. The surface tension of kneading water is 40 dyn /
It is better to adjust it to cm ² or less.

As the synthetic resin used in the synthetic resin emulsion,
Vinyl acetate resin, vinyl chloride resin, epoxy resin, acrylic resin, etc. are available. As latex, MBR (methacrylate butadiene rubber), NBR (nitrile butadiene rubber), SBR (styrene butadiene rubber), etc. are walls. It is appropriately selected and used according to the material in the coating layer of the base plate. The addition amount is appropriately 1 to 20% by weight with respect to the amount of cement. If the amount added exceeds 20%, the viscosity increases excessively, increasing the number of air bubbles in the wall coating material week,
Decrease wall strength.

As described above, when a coating wall coating material obtained by mixing a mixture of cement and aggregate with kneading water obtained by mixing an emulsion or latex of a nonionic surfactant and synthetic resin with water and water is applied to the above-mentioned wall base material. Is a strong adhesion between the coating layer on the wall base plate and the coating material on the wall, which restrains the drying shrinkage in the initial stage to prevent the occurrence of cracks, and the capillary tube during the subsequent curing period. Since the tensile stress at the time of evaporation and movement of water in the structure is reduced, the occurrence of hair cracks can be almost completely prevented.

Furthermore, in the method of the present invention, it is more effective if the above expansive admixture is used in combination.

Claims (5)

[Claims] 1. In a construction direction of a wall surface using a mortar wall base plate capable of directly applying a mortar wall coating material on the surface, the wall base plate is a wall base structure such as a pillar, a stake column, or a furring strip. We fixed it with nails on the material and gave it a wall base treatment, and further, on all these surfaces, to the mixture of cement and aggregate,
A method for constructing a wall surface in a house, which comprises applying a coating material mixed with kneading water containing a nonionic surfactant and a synthetic resin emulsion or latex. 2. The method according to claim 1, wherein the nonionic surfactant has a molecular weight of 1000 or less and an HLB value of 5 to 15. 3. The method according to claim 1, wherein the nonionic surfactant is 0.5 to 8% by weight based on the amount of cement in the wall coating material. 4. A first term claims, characterized in that the surface tension of the water for kneading is adjusted to below 40 dyn / cm ² ~
The method according to any one of item 3. 5. A coating layer in which the emulsion or latex of the synthetic resin is 1 to 20% by weight with respect to the amount of cement in the wall coating material, and the synthetic resin forms the surface of the wall base plate. Claims 1 to 4 characterized in that the material is selected from the group of materials and resins having good adhesiveness.
The method according to any one of the items.