JPH0730606B2 - Building base material and method of manufacturing the same - Google Patents

Description

TECHNICAL FIELD The present invention relates to a building base material, in particular, a building base material fixed on a skeleton structure of a building, on which mortar, plaster, spray coating material, The present invention relates to a building base material suitable for applying or spraying a spray paint or the like to form a wall surface, and a manufacturing method thereof.

2. Description of the Related Art Conventionally, as the above-mentioned type of architectural base material, after waterproofing the surface of the wooden board, hydraulic cement is mixed with aggregate, or if necessary, synthetic resin emulsion is further added and mixed. There is known a base material on which a mixture layer is formed by applying the mixture described above, or a base material using an inorganic board such as an asbestos cement board in place of the wood board.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention Since the above-described type of construction base material can be nailed with a predetermined size base material to the base structure of the building and immediately applied and sprayed on the wall structure, it is a traditional wet wall construction. In the coating method, it has contributed to the omission of the undercoating process such as lapping underlays such as wood lapping and plywood, undercoating with waterproof sheets such as felt and roofing, pasting with lath netting, and mortar undercoating.

However, when using a building base material that uses a wood board that is a flammable material for the substrate as a fireproof structure material, thicken the coating layer on the substrate surface of the base material to increase the coating thickness of mortar such as a construction site. The overall thickness of the fireproof material on the outside of the wood board can be either thinned, or conversely, the coating layer on the substrate surface of the base material can be thinned to increase the coating thickness of mortar etc. in the field. Must meet the criteria. In the former case, the base material for construction itself becomes heavy and the workability is poor, and in the latter case, multiple recoating is required, resulting in poor work efficiency.

In order to solve the above-mentioned problem, it is also performed to use an inorganic plate as a base material substrate, but after the wall construction, the inorganic plate itself shrinks for a long period of time due to the carbonation effect of carbon dioxide gas in the air, A gap is created in the joint part of the inorganic board, which causes a crack on the surface of the coating material such as mortar applied on the base material along the joint portion, the coating material is peeled off, and the base structure of the building due to rainwater penetration Corrosion of the
It reduces the durability of the house.

In addition, the conventional building base material that uses a hydraulic inorganic board as a substrate absorbs water and moisture in stock, or absorbs and absorbs water due to rainfall after fixing the building base material to the base structure of the building. Calcium hydroxide generated during the sum reaction elutes, moves to the surface of the base material when water evaporates, reacts with carbon dioxide in the air to generate calcium carbonate (efflorescence), and the calcium carbonate layer is mortar, etc. The adhesive force between the top coating material and the mixture layer was reduced.

Means for Solving the Problems In the present invention, a hydraulic inorganic binder is used as a main component without forming or forming a waterproof layer on the surface of a hydraulic inorganic plate, and various inorganic and organic aggregates, A mixture layer containing a synthetic resin or a bituminous substance is formed, and the hydraulic inorganic plate and the hydraulic inorganic binder in the mixture layer are carbonated.

Action Since the hydraulic inorganic binder and the hydraulic inorganic binder in the mixture layer are carbonized, they are contracted,
After the construction, the top coat material layer does not crack or peel off, and corrosion of the building base structure can be prevented.

Examples In the present invention, the hydraulic inorganic plate means calcium hydroxide component (Ca (OH) ₂ ) or calcium oxide component (Ca
O) is included, and its typical examples are cement board, asbestos cement board, slag cement board, cement calcium silicate board, cement perlite board, slag lime board, ettringite cement board and the like.

When forming a waterproof layer on the surface of a hydraulic inorganic plate, synthetic resin such as vinyl acetate resin, vinyl chloride resin, acrylic resin, epoxy resin, ethylene-vinyl acetate resin,
Acrylonitrile butadiene rubber (NBR), butadiene acrylo rubber (MBR), styrene butadiene rubber (SBR)
Apply a waterproofing agent containing rubber latex, bituminous substances such as asphalt, tar, etc., or a mixture of these emulsions, alone or in combination, and dry to form a waterproof layer. If desired, calcium carbonate, talc, clay, etc. can be mixed with these waterproofing agents. The mixed substance formed on the surface of the hydraulic inorganic plate or the waterproof layer has a hydraulic inorganic binder as a main component, and the synthetic resin, rubber latex, bituminous substance or emulsion thereof used for the above-mentioned waterproof layer, or further Carbon charcoal, clay, fly ash, incineration ash, slag, sand, talc, limestone grains, silica stone grains,
Inorganic granular aggregate such as crushed stone, organic granular aggregate such as synthetic resin beads such as polyester, polyethylene and polystyrene, inorganic fibrous aggregate such as asbestos, rock wool, glass fiber, alumina fiber, steel fiber and carbon fiber, Polyethylene fiber, polypropylene fiber, aramid fiber,
Organic fibrous aggregate such as nylon fiber, vermiculite, expanded shale, expanded clay, perlite, shirasu balloon, inorganic foam lightweight aggregate such as glass foam beads, foamed polyethylene, polystyrene, synthetic resin foam beads such as urethane, or A roll coater, a reverse roll coater, a mixture prepared by mixing a single kind or a plurality of kinds of aggregates such as organic foam lightweight aggregates such as crushed granules of synthetic resin foam, adding an appropriate amount of water and stirring and mixing. It is formed by applying it in layers using a spraying device, a screen printing device, etc., and then curing and curing.

The mixture layer may be dried after coating to interrupt the curing reaction. The surface of the mixture layer may be flat or uneven.

The base plate thus obtained is cured by curing in carbon dioxide gas or a gas atmosphere containing carbon dioxide gas. For example, carbon dioxide is sent by feeding carbon dioxide gas into a curing chamber containing the base material or by passing the base material through a drying furnace filled with carbon dioxide gas.

At this time, calcium hydroxide and calcium oxide in the hydraulic inorganic plate and the mixture layer cause a carbonation reaction as described below and shrink.

CA (OH) ₂ + CO ₂ = CaCO ₃ + H ₂ O or 3CaO ・ 2SiO ₂・ 3H ₂ O + 3CO ₂ → 3CaCO ₃ + 2SiO ₂ + 3H ₂ O The generated calcium carbonate is retained as fine crystals inside the base material. In the stock of the base material, moisture absorption after being fixed to the base structure of the building does not cause elution of calcium hydroxide due to water absorption, and efflorescence can be prevented.
It is possible to prevent a decrease in the adhesive force between the mixture layer and the overcoat layer.

The above-mentioned waterproof layer not only has a waterproof effect, but also flattens the surface of the hydraulic inorganic plate, and when the hydraulic inorganic plate has a porous surface, when the mixture is applied, the voids in the concave portions of the surface ( Air bubbles) to prevent bubbles from being formed at the boundary surface between the hydraulic inorganic plate and the mixture layer. It also increases the adhesion area between the hydraulic inorganic plate and the mixture layer. Further, by appropriately selecting synthetic resin, rubber latex, bituminous substance, etc. in the waterproof layer and the mixture layer, the intermolecular attractive force of these substances improves the adhesive force between the layers.

The synthetic resin, rubber latex, and bituminous substance, etc. in the mixture improve the mixing and adhesion of the main component and the aggregate, and the waterproofness of the cured mixture layer and adhesion with the coating material applied on it. It also improves power.

Effects of the Invention The effects of the present invention are as follows.

1. The hydraulic inorganic plate in the base material and the coating material such as mortar applied on the base material are completely adhered via the waterproof layer and the mixture layer.

2. Since a hydraulic inorganic plate is used as the substrate, it can be used as a fireproof structural material, and the mixture layer and the coating material layer such as mortar applied thereon can be thinned, improving workability.

3. Since the hydraulic inorganic plate and the mixture layer have been carbonated in advance, carbonation after construction hardly occurs, and cracking and peeling of the topcoat due to shrinkage of the base material can be completely prevented.

4. By preventing cracks and flakes, it is possible to prevent corrosion of the underlying structure of buildings due to rainwater infiltration.

Claims (2)

[Claims] 1. A hydraulic inorganic bond on the surface of a hydraulic inorganic plate with or without a waterproof coating layer containing at least one selected from the group consisting of synthetic resins, latex and bituminous substances. 1 or more selected from the group consisting of synthetic resin, latex and bituminous material as the main component, and inorganic or organic granular or fibrous aggregate, inorganic or organic foam lightweight aggregate A construction base material, wherein a mixture layer in which seeds are mixed is formed, and the hydraulic inorganic plate and the hydraulic inorganic binder in the mixture layer are carbonated. 2. A waterproof layer is formed by coating one or more selected from the group consisting of synthetic resins, latex and bituminous substances on the surface of a hydraulic inorganic plate to form a waterproof layer, or without forming a waterproof layer. 1 or more selected from the group consisting of a synthetic resin, a latex and a bituminous substance containing a hard inorganic binder as a main component, and an inorganic or organic granular or fibrous aggregate or an inorganic or organic foamed lightweight aggregate
After applying one or several kinds of mixture in layers, it is dried if necessary to form a mixture layer, and then cured by curing in a carbon dioxide gas or a gas atmosphere containing carbon dioxide gas to obtain hydraulic properties. A method for producing a building base material, which comprises subjecting a hydraulic inorganic binder in an inorganic plate and a mixture layer to a carbonation treatment.