JPH0143109B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a construction base plate suitable for use as a heat insulating material and base material with excellent dew resistance for walls or roofs of residential buildings, and a method for manufacturing the same.

In general, architectural boards such as soft fiberboard, plywood, and gypsum board are widely used as base boards for interior and exterior walls of buildings such as houses, base boards for roofs, and the like. In particular, fiberboards such as soft fiberboards are porous and have excellent heat insulating properties, and they also have excellent breathability in that they absorb and dissipate moisture in the air depending on the surrounding environmental conditions. It exhibits a humidity control effect in a space and has the effect of suppressing the occurrence of dew condensation, and is suitable as a substrate for the base plate as described above.

On the other hand, it has been known that one way to improve the heat insulation properties of such base plates is to lower the radiant heat absorption rate of the base plate by pasting aluminum foil or sheets on the surface of the base plate. ing.

However, although such adhesion of aluminum foil or sheet is effective in improving the heat insulation properties of the base plate, on the other hand, it reduces the breathing performance of the base plate. Therefore, there is a problem in that dew condensation is likely to occur in, for example, a space within a wall where such a base plate is installed. Particularly, in the case of a base plate made of fiberboard such as soft fiberboard or wood-based material, one of its advantages will be lost.

For this reason, it may be possible to solve the above problems by providing perforations in the aluminum foil or sheet, but this merely improves the perforations and provides sufficient dew-proofing properties. It is still insufficient to do so. However, if the number of through holes is increased too much for this purpose, the exposed portion of the substrate surface will increase and the radiant heat absorption rate will increase, making it impossible to improve the heat insulation properties. Furthermore, in terms of production, it is undesirable that an aluminum foil or sheet must be attached to the substrate and holes must be provided in the foil or sheet.

Therefore, in view of these points, the present invention aims to easily obtain a construction base plate that has a low radiant heat absorption rate and excellent heat insulation properties, and also has absorption performance and excellent dew resistance. It is something.

For this purpose, the structure of the architectural base board of the present invention is such that an aluminum powder-containing coating layer is provided on the surface of a base such as a fiberboard, and is formed by applying an aluminum powder-containing paint. The coating layer has a low radiant heat absorption rate and has excellent heat insulation properties, and the coating layer's moderate water vapor permeability provides effective dew protection without significantly impairing the breathing performance of the board. It is designed to be expressed.

A further object of the present invention is to provide a method for manufacturing the architectural base plate having the above-mentioned structure, which effectively improves not only the heat insulation properties but also the dew proof properties, and which also has good productivity.

That is, in the manufacturing method of the present invention, a fibrous slurry prepared using wood fibers or mineral fibers as the main raw material is formed into a wet mat by wet papermaking, and after coating the surface of the wet mat with an aluminum powder-containing paint, This method is characterized by drying a wet mat, thereby drying the aluminum powder-containing coating layer at the same time as drying the substrate such as fiberboard, and in this drying process, part of the moisture in the substrate such as fiberboard is removed. By evaporation of moisture in the paint and paint from the coating layer, a large number of extremely fine water vapor permeation channels are formed in the coating layer, resulting in good water vapor permeability.

Hereinafter, the present invention will be explained in detail based on the drawings.

FIG. 1 shows an architectural base plate A according to the present invention,
The architectural base board A has a substrate 1 surface such as fiberboard,
An aluminum powder-containing coating layer 2 is provided by applying and drying an aluminum powder-containing paint.

As the substrate 1, in addition to fiberboard such as soft fiberboard and mineral fiberboard, plywood, particle board,
Suitable materials include calcium silicate boards, gypsum boards, magnesium carbonate boards, etc., which are porous and have good heat insulation properties, and also have wet absorption and release performance (breathing performance). In particular, soft fiberboards such as insulation boards and sheathing insulation boards are materials with excellent heat insulation and breathability, and are usually brown in color and have a high radiant heat absorption rate. When used as the substrate 1 of the base plate A, the effect of the aluminum powder-containing coating layer 2 is effectively expressed, and the base plate A with excellent heat insulation and dew resistance can be formed, which is desirable.

Further, the aluminum powder-containing coating layer 2 is colored almost uniformly in an aluminum color over the entire surface of the substrate 1, and is formed by applying and drying a paint such as a water-based paint while lowering the radiant heat absorption rate of the base plate A. Therefore, it has a large number of extremely fine pores through which water vapor permeates, and has good water vapor permeability.

The architectural base plate A having the above-mentioned configuration is
The heat insulating properties of the substrate 1 and the low radiant heat absorption of the aluminum powder-containing coating layer 2 on the surface of the substrate 1 provide excellent heat insulating properties, and the moisture vapor permeability of the coating layer 2 improves the breathing performance of the substrate 1. It has excellent dew resistance without much damage. In addition, it can be obtained by a simple method of coating the surface of the substrate 1 with a paint containing aluminum powder, making it easier and more productive than conventional methods of pasting aluminum foil or sheet or forming holes in the foil. It can be formed easily. Although FIG. 1 shows the aluminum powder-containing coating layer 2 formed on one side of the substrate 1, it is of course possible to form it on both sides.

Therefore, when such a base plate A for construction is used as a base plate for an exterior wall, for example, as shown in FIG. When the wall is constructed by attaching an external wall material such as a siding material 6, the radiant heat from the siding material 6 is applied to the aluminum powder-containing coating layer 2.
The moisture generated in the wall space is absorbed by the substrate 1 through the water vapor permeable coating layer 2, resulting in condensation. will not occur.

Next, a method for manufacturing the above-mentioned architectural base plate A will be explained.

First, the main raw materials are wood fibers made by defibrating wood with a pulper, etc., or mineral fibers such as rock wool and slag wool, and if necessary, binders such as starch, synthetic resins, rosin, wax, asphalt, etc. A fibrous slurry prepared by adding a water-resistant agent and a fixing agent such as sulfuric acid is formed into a wet mat by wet papermaking using a circular net type wet papermaking machine or the like.

Next, a paint containing aluminum powder is applied to the surface of this wet mat. As the aluminum powder-containing paint used here, it is preferable to use a water-based paint. This water-based paint is, for example, one whose main components are aluminum powder and a synthetic resin aqueous solution or synthetic resin emulsion, diluted with water appropriately, and more specifically, aluminum powder is mixed with a solvent such as mineral spirits and a water-soluble paint. The pigment component is a paste prepared by mixing with a surfactant, and the synthetic resin aqueous solution or synthetic resin emulsion includes, for example, water-soluble phenolic resin,
Examples include acrylic resins such as melamine resins, urea resins, acrylic resins, acrylic styrene resin emulsions, and ethylene vinyl acetate resin emulsions, styrene resins, and vinyl acetate resin emulsions.

It is preferable to use scale-like aluminum powder as the aluminum powder, since it is possible to obtain a coated layer with good hiding properties even with a small amount of aluminum powder.

Further, the aluminum powder-containing paint may be applied in the following manner.

That is, when applying an aluminum powder-containing paint using a synthetic resin liquid with ionic properties as a vehicle, this paint and a gelling agent, which has an ionicity opposite to that of the synthetic resin, are applied, and air is removed in advance. This is a coating method in which the two are mixed inside or on the coating surface to form a resin flock. For example, when an anionic acrylic styrene resin emulsion is used in a paint containing aluminum powder, a cationic gelling agent such as aluminum sulfate, polyacrylamide, or epichlorohydrin is used as the gelling agent. With such a method, the aluminum powder-containing coating layer can be more effectively formed on the surface of the wet mat.

Thereafter, the wet pine whose surface was coated with the aluminum powder-containing paint as described above was dried in a drying device, thereby forming the architectural base plate A of the present invention in which the aluminum powder-containing coating layer 2 was formed on the surface of the substrate 1. is manufactured.

Therefore, the architectural base plate A obtained in this way is formed by coating the surface of wet pine with aluminum powder-containing paint and then drying it, so that the aluminum powder is applied at the same time as the wet pine is dried. The containing coating layer 2 can be dried and can be manufactured with good productivity. Moreover, in this drying process, the moisture in the paint and the substrate such as fiberboard
A portion of the water inside evaporates from the coating layer 2, and this evaporation results in the formation of many extremely fine water vapor transmission channels in the coating layer 2.
It is possible to obtain a base plate A having superior dew-proofing properties compared to the case where a paint is simply applied to the surface of the substrate 1.

Now, to show a specific example of the method of the present invention, a slurry-like material prepared by adding additives such as a binder, a waterproofing agent, and a fixing agent to wood fibers obtained by defibrating wood chips with a pulper is used. A moist fibrous pine is obtained by papermaking using a circular net type wet papermaking machine, and on the surface of this wet pine, an aluminum powder paste (solid content 65 After applying 300g/ ^m2 of aluminum powder-containing paint consisting of 4 parts by weight of acrylic styrene copolymer emulsion resin (solid content 50% by weight) and 60 parts by weight of water,
It was dried with a dryer to obtain a base board for construction. This architectural base board has a silvery white color and has excellent heat insulation properties due to the heat insulation properties of the fiberboard substrate and the low radiant heat absorption rate of the aluminum powder-containing coating layer applied to the substrate surface. It has excellent dew resistance due to the good water vapor permeability of the coating layer.

As described above, according to the architectural base board of the present invention,
Since it has excellent heat insulation and dew-proof properties and is easily obtained, it can be provided at a low cost and is suitable as a base material for walls, roofs, etc.

Furthermore, according to the manufacturing method of the present invention, heat insulation properties,
This has the advantage that the above-mentioned architectural base plate having excellent dew resistance can be manufactured with high productivity, and the dew resistance can be further improved.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an example of the architectural base plate of the present invention, and FIG. 2 is a cross-sectional view showing a construction state when the architectural base plate of FIG. 1 is used as an exterior wall base plate. A... Architectural base plate, 1... Substrate, 2... Aluminum powder-containing coating layer.

Claims (1)

[Scope of Claims] 1. A base board for construction in which an aluminum powder-containing coating layer is provided by applying an aluminum powder-containing paint to a base surface such as a fiberboard. 2 Claim 1 in which the substrate is a soft fiberboard
Architectural base board as described in section. 3. A fibrous slurry prepared using wood fibers or mineral fibers as the main raw material is wet-formed to form a wet pine, a paint containing aluminum powder is applied to the surface of the wet pine, and then the wet pine is dried. Characteristic manufacturing method for architectural base plates. 4. The method for producing a base board for construction according to claim 3, wherein the aluminum powder-containing paint is a water-based paint prepared by containing scale-like aluminum powder, an aqueous synthetic resin solution or a synthetic resin emulsion, and water as main components.