JPH0575869B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a base material for construction, and particularly to a base material with excellent fire-retardant performance that can be directly coated with a spray coating material, and a method for producing the same.

[Prior art and purpose and structure of the present invention]

Conventionally, many base materials have been proposed that are nailed to the base structure material in advance for applying decorative mortar. This type of conventional base material has succeeded in significantly shortening the construction period in that decorative mortar can be applied directly onto the base material without the need for surface treatment such as lath netting or mortar coating. be. However, if we go one step further and remove the process of applying intermediate coat mortar from the on-site construction, we can perform finishing processes such as coating mortar directly on the base material, making it possible to further shorten the construction period. is conceivable.

However, if such a construction base material were to be made, a decorative mortar layer would have to be laminated on the base material in advance, which would significantly increase the weight and also pose problems in terms of the strength of the base material. It will arise.

Based on the above findings, the present invention has been developed by providing a lightweight cement layer 4 corresponding to an intermediate mortar layer on the base material in advance, as will be described in detail below. The aim is to provide foundation materials for construction.

[Explanation of Examples] Examples of the present invention will be described below.

The construction base material of the present invention is formed from a substrate 1, a waterproof coating layer 2, a mixture layer 3, a lightweight cement layer 4, and a surface cement layer 5, as shown in FIG.

As the substrate 1, a plate-like body made of an inorganic or organic material, or a mixed or composite board of an inorganic and organic material, such as a plywood fiberboard, a wood chip board, a gypsum board, a cement board, a wood chip cement board, or a calcium silicate board, is used.

Next, a synthetic resin, latex, bituminous material, or an emulsion thereof is uniformly coated on the surface of the substrate 1 using a coating device such as a roll coater or a flow coater and dried to form a waterproof coating layer 2.

Synthetic resins for the waterproof coating layer 2 include vinyl acetate resin, vinyl chloride resin, acrylic resin, epoxy resin, etc., and latexes include acrylonitrile butadiene rubber (NBR), butadiene acrylic rubber (MBR), styrene butadiene rubber (SBR), etc. However, tar, asphalt, etc. are used as bituminous substances.

Clay, talc,
Auxiliary substances such as fillers such as calcium carbonate or dispersants may be added and mixed.

When the substrate surface is a porous plate, the waterproof coating layer 2 makes the surface a smooth surface to prevent moisture from permeating through the surface (improving waterproof performance), and prevents the substrate itself from expanding due to hygroscopic expansion due to permeated moisture. It functions to prevent warping and decay.

Also, depending on the material of the substrate 1, the waterproof coating layer 2 prevents the elution of water or alkali-soluble components (scum), and delays the curing due to the scum of the mixture layer 3 and lightweight cement layer 4 applied thereon. It also serves to eliminate the occurrence of inhibition.

Furthermore, by smoothing the surface with the waterproof coating layer 2, when the surface is porous, voids (air pockets) in the surface recesses are eliminated and the generation of air bubbles is prevented. This has the effect of substantially increasing the bonding area between the substrate 1 and the substrate 1.

Next, a mixture of cement, synthetic resin, latex, or bituminous material, aggregate, and water is applied onto the waterproof coating layer 2 in a layer using a coating device such as a roll coater, and then hardened or semi-hardened. form.

The mixture layer 3 may have a smooth surface or an uneven surface. The synthetic resin, latex, or bituminous substance added to the mixture layer 3 is the same as that used for the waterproof coating layer 2.

By using materials of the same type in this way, the synthetic resin, latex, bituminous material, etc. of the mixture layer 3 can be replaced by the synthetic resin, latex, bituminous material, etc. that constitute the waterproof coating layer 2.
Strong adhesion is achieved through intermolecular attraction with latex, bituminous materials, etc.

The aggregates other than lightweight aggregates used in the mixture layer 3 are selected from calcium carbonate, talc, clay, fly ash, incinerated ash, slag, etc., and each of them is used alone or in an appropriate mixture.

Next, a mixture of cement, lightweight aggregate, and water is coated on the mixture layer 3 in a layered manner using a coating device such as a roll coater or a spreading device such as a foamer to form a lightweight cement layer 4.

If desired, synthetic resins or latexes or bituminous materials similar to those mentioned above may be added to the lightweight cement layer 4.

The cement may be any of ordinary cement, early strength cement, ultra early strength cement, moderate heat cement, alumina cement, blast furnace cement, fly ash cement, silica cement, rapid hardening cement, etc., and is not particularly limited.

Lightweight aggregates include vermiculite, perlite, expansive rock, expanded clay, shirasu balloons, and synthetic resin foam beads such as polyethylene and polystyrene.
Pulverized particles of synthetic resin foam are selected, and each of them is used alone or in an appropriate mixture.

By using lightweight aggregate in this way, the lightweight cement layer 4 has a significantly lower specific gravity than the mixture layer 3.
Therefore, even if the lightweight cement layer 4 is formed thicker than the mixture layer 3, the weight as a construction base plate can be formed within a range that does not hinder handling on site. Furthermore, by forming the lightweight cement layer 4 thickly, excellent fire prevention performance can be obtained with a structure that only requires a finishing process after fixing the architectural base plate of the present invention to the structural base.

Next, after forming the lightweight cement layer 4, the surface cement layer 5 is formed by immediately spreading cement in a thin layer without curing and hardening. In this case, as shown in FIG. 2, the net-like material n may be placed on the lightweight cement layer 4 without curing and hardening the lightweight cement layer 4, if necessary, before the cement is spread.

The net-like material n may be made of cheesecloth, carbon fiber, glass fiber, alkali-resistant glass fiber, synthetic fiber such as vinylon or nylon, or metallic material such as wire mesh or lath mesh.

In this way, by providing a net-like object,
To prevent cracks from forming in the lightweight cement layer 4 and the surface cement 5 even if the base material for construction of the present invention is transported or constructed, even if the substrate is temporarily bent due to external addition. be able to.

The cement sprinkled on the surface is a lightweight cement layer 4
It absorbs the water inside and becomes hydrated.

The thus obtained laminate is compacted as necessary, and after compaction is naturally cured or steam cured to cure and harden the mixture layer 3, lightweight cement layer 4, and surface cement layer 5. Obtain building material.

[Actions and effects of the present invention]

As described above, the base material of the present invention has a waterproof coating layer 2, a mixture layer 3, a lightweight cement layer 4, and a surface cement layer 5 sequentially laminated on the surface of a substrate 1, and its functions and effects can be summarized as follows. That's right.

Since the base material of the present invention is provided with a lightweight cement layer 4 on the surface of the mixture layer 3 in advance, finishing such as applying finishing mortar is directly applied to the base material without applying an intermediate mortar layer as in the conventional method. By performing the treatment, wall surface construction can be easily performed. Therefore, the construction period can be significantly shortened compared to the conventional case of applying a decorative mortar layer.

Water absorption into the substrate 1 is completely prevented by the waterproof coating layer 2 on the surface, and the substrate 1 itself does not warp or dance due to water absorption. The moisture content does not decrease, and cracking in the mixture layer 3 and lightweight cement layer 4 is prevented.

Since the lightweight cement layer 4 is made of lightweight cement, the weight of the base material itself can be reduced.

[Brief explanation of the drawing]

Figure 1: Cross-sectional view of the base material of the present invention. Figure 2: Cross-sectional view of a net-like material placed on a lightweight cement layer. DESCRIPTION OF SYMBOLS 1... Substrate, 2... Waterproof coating layer, 3... Mixture layer, 4... Light cement layer, 5... Surface cement layer, n... Net-like material.

Claims (1)

[Claims] 1. A waterproof coating layer 2 made of synthetic resin, latex, or bituminous material is formed on the surface of the substrate 1, and cement, synthetic resin, latex, bituminous material, and lightweight bone are formed on the waterproof coating layer 2. Forming a mixture layer 3 of aggregates excluding wood, further forming a lightweight cement layer 4 made of a mixture of cement and lightweight aggregate on the mixture layer 3, and further forming a surface cement 5 on the surface thereof. An architectural base material characterized by: 2. A synthetic resin, latex, or bituminous substance is coated on the surface of the inorganic or organic substrate 1 and dried to form a waterproof coating layer 2. Next, cement and synthetic resin, latex, or bituminous material are coated on the waterproof coating layer 2. A mixture of aggregates other than solid material and lightweight aggregate is applied in a layer and then cured or semi-cured to form a mixture layer 3. Next, a lightweight cement layer consisting of a mixture of cement and lightweight aggregate is applied on the mixture layer 3. A method for producing a base material for construction, comprising: forming a surface cement layer 5, and further curing and hardening after dispersing cement to form a surface cement layer 5.