JP2552289B2 - Composite board for building base material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention provides a composite board for a building base material, which is based on a cement-based cured material board, and more specifically has waterproofness and nail pullout holding power. The present invention relates to a composite plate used as a base material for roofs and the like.

[Prior Art] As a base material for a building, for example, as a base material for a roof, conventionally, in the case of wooden construction, an asphalt roofing is laid on a base plate, and a roofing material such as a tile is arranged on it. However, in this construction method, although it is possible to fix the tiles by nailing the tiles to the base plate, the base plate rots due to moisture and the roofing also condenses due to the moisture, so that the waterproofness is low in reliability. Also, when arranging roof tiles in concrete construction or ALC construction, there is no corrosion due to moisture, but nailing is not possible and it is not waterproof. Even in the case of mortar that can be nailed (for example, sky mortar), after asphalt roofing is laid, the tiles are nailed and installed, but it requires a training period of about one week after placing, and the nail pullout retention force However, there are many problems such as the need to attach timber to the timber and fix the roof tiles at the eaves to supplement the next point.

The present invention has been made in view of the above problems.
Its purpose is to propose a composite board for a building base material, which is excellent in waterproofness and has a high nail pullout retention force.

[Structure of Invention]

This composite board for building base material is made by laminating and fixing a cement-based cured material board and a waterproof material layer disposed on the surface thereof, and the waterproof material layer is a base material mainly composed of asphalt and 8.8 to 40% by weight. The reinforcing short fibers are uniformly dispersed and mixed, and the short fibers are oriented in a plane direction parallel to the asphalt layer, and a nonwoven fabric is laminated on both sides of a solid asphalt composition layer having a thickness of 3 mm or more. It is characterized by being done.

The asphalt composition layer of the composite plate is a solid or semi-solid blown asphalt (eg, penetration (JIS.K2530) 10 to 20), rubber asphalt (eg, penetration 40 to 100), gilsonite (eg, needle) at room temperature. 0), improved asphalt mixed with synthetic resin, etc.
Alternatively, an asphalt mixture obtained by adding inorganic powder such as calcium carbonate, synthetic resin powder such as ethylene / vinyl acetate copolymer foam or comb tire powder to asphalt is used as a base material.

The reinforcing short fibers mixed with the base material are cotton linters (fiber length 2 to 15 mm), natural fibers such as coarse cotton, polyester fibers,
It is a synthetic fiber such as polypropylene fiber (for example, fineness 1 to 5 denier, fiber length 2 to 15 mm), or an inorganic fiber such as asbestos.

These fibers usually have a short fiber length of 20 mm or less, and are uniformly dispersed in a molten base material to form a dense asphalt composition layer having a thickness of 3 mm or more.

The amount of the reinforcing short fibers to be mixed is preferably a large amount within a range in which the fibers and the base material are homogeneously mixed and a dense structure having no bubbles or voids is formed. When the proportion of the fibers is too large, the amount of the base material filling the spaces between the fibers is insufficient, and the asphalt composition layer having a dense structure cannot be formed. On the other hand, if the amount is too small, the force for restraining the base material is insufficient, and the pullout holding force of the nail cannot be increased. The proportion of short fibers in the asphalt composition layer is affected by the density, bulkiness, asphalt fluidity, type and amount of hardness additives, etc., but it is necessary to set it in the range of 8.8-40% by weight. Is.

It is necessary that the thickness of the asphalt composition layer is 3 mm or more. If it is less than 3 mm, the layer holding the nail is too thin, and high pull-out holding force cannot be expected. The thickness is preferably 5 mm or more, which corresponds to the depth of the nail to be driven, and the thickness is usually 5
The range is up to 30 mm.

The non-woven fabric used for this composite plate may be any of the wet method, dry method, needle punch method, stitch bond method, spun bond method, etc., but the non-woven cloth by the spun bond method is preferable. Spunbond non-woven fabric, which is the main component, has heat resistance and dimensional stability that can withstand the molten asphalt temperature, has excellent processability, adheres well to the asphalt composition layer for coating protection, and is suitable for low cost and easy handling. is there.

To manufacture the waterproof material layer of this composite plate, for example, the following method is used. Asphalt, which is the main material, is mixed with a certain amount of inorganic powder, synthetic resin powder, etc., and the base material is heated and melted, short fibers for reinforcement are mixed, and the whole is uniformly dispersed. , Coat to the required thickness by the doctor knife coating method or slit die coating method, and stick the non-woven fabric on the upper surface. In this step, the non-woven fabric is firmly bonded to the asphalt composition layer in the molten state or the semi-molten state to form a waterproof material layer.

Supply the molten asphalt mixture onto the non-woven fabric,
When the asphalt composition layer is formed by the doctor knife coating method or the slit die coating method, the molten mixture is constrained by the doctor knife or the slit die to flow, and the reinforcing short fibers mixed are directed in the flowing direction of the mixture. Aligned and horizontally oriented. The short fibers oriented in this way strongly constrain the asphalt composition layer in the in-plane direction, greatly improve the pull-out retention force of nails driven into the asphalt composition layer, and greatly contribute to the increase in the in-plane strength of the asphalt composition layer. To do.

The waterproof material layer thus produced is bonded to a cement-based cured product board using an adhesive such as an epoxy adhesive to form a composite board.

FIG. 1 is a composite board according to the present invention made in this way, in which a cement-based cured product board 4 and a waterproof material layer 3 formed by laminating nonwoven fabrics 2 and 2 on both sides of an asphalt composition layer 1 are bonded. It is configured by bonding with the agent 5.

Further, a hydraulic cement composition may be cast in contact with the waterproof material layer and solidified to form a composite board in which the cement-based cured material board and the waterproof material layer are laminated and fixed.

FIG. 2 shows a composite board according to the present invention made in this way, in which the waterproof material layer 3 formed by laminating the nonwoven fabrics 2, 2 on both sides of the asphalt composition layer 1 and the cement-based cured material board 4 are both The cement-based cured product 6 that has penetrated into the non-woven fabric 2 at the interface of the above and has been cured is adhered.

In addition, for example, as shown in FIG. 3, concave grooves and ridges 8 are alternately formed on one surface of the waterproof material layer 3, and a hydraulic cement composition is placed in contact with this surface to form a composite board. You can also The waterproof material layer 3 and the cement-based hardened material plate 4 can be more firmly fixed at the intricate uneven interface via the cement-based hardened material 6 that has penetrated into the nonwoven fabric 2 and hardened.

Fig. 3 shows that the composite board constructed in this way is mounted on the building frame as a roof substrate, and the roof tile 9 on the board is nailed on it.
It is a roof laid by locking 10 in place.

Needless to say, the cement-based cured product plate of this composite plate can be reinforced by embedding reinforcing bars, lath wire nets, etc., if necessary.

[Work]

The present invention has the above configuration. The asphalt composition layer of this composite board for building base materials has a solid thickness of 3 m in which the base material and reinforcing short fibers oriented in the in-plane direction are uniformly dispersed and mixed.
It is a layer of m or more and does not permeate water and has high waterproof performance. Further, this layer allows nails to be driven therein, and the nails thus driven exert a high pull-out holding force under the resistance of the asphalt base material constrained by the reinforcing short fibers and the interlaced fibers. Since non-woven fabrics are laminated on both sides of the asphalt composition layer, cracks and fractures are unlikely to occur in the asphalt composition layer. Since a non-woven fabric exists at the interface with the cement-based cured product plate, the adhesive strength between the cement-based cured product plate and the asphalt composition layer is remarkably strengthened by permeating and curing the adhesive or hydraulic cement composition into this non-woven fabric. It can be anything.

〔Example〕

Polyester fiber spunbond non-woven fabric (weight, 100g / m
² ) On the upper surface, a mixture of 66.7 parts of asphalt, 6.7 parts of Gilsonite, 17.8 parts of ethylene / vinyl acetate copolymer foam powder, and 8.8 parts of polyester fiber (fiber length 10 to 15 mm) was coated with a doctor knife coating method. A 7 mm thick asphalt composition layer was formed, and the upper surface thereof and the same polyester fiber spunbonded non-woven fabric were bonded together to form a waterproof material layer having a thickness of about 7.5 mm.

Cement mortar was cast in contact with one surface of the waterproof material layer to form a cement mortar plate having a thickness of 50 mm. The cement mortar board and the waterproof material layer were firmly adhered to each other through the cement hardened product that had penetrated into the non-woven fabric and hardened to form a composite board.

It was possible to attach this composite plate to a building frame as a roof substrate and then attach roofing materials such as roof tiles and metal plates by nailing.

〔The invention's effect〕

The present invention is as described above. This composite board for base is attached to the frame of a building such as a concrete as a roof base material or a floor base material, and the nail material is directly nailed to the roof material or the floor material to be mounted. It is possible to impart high waterproofness at the same time. Further, the asphalt composition layer can enhance functions such as sound insulation, heat insulation, and shock absorption.

[Brief description of drawings]

1 and 2 (a) are cross-sectional views of the composite plate of the present invention, FIG. 2 (b) is an enlarged cross-sectional view of the interfacial non-woven fabric part of FIG. (A), and FIG. 3 is a tile laid on the upper surface. It is a sectional view of the composite plate. 1 ... Asphalt composition layer, 2 ... Nonwoven fabric, 3 ... Waterproof material layer, 4 ... Cement-based cured material plate, 5 ... Adhesive, 6
...... Penetration-cured cured product, 7 ...... concave groove, 8 ... ridge, 9
... tiles, 10 ... nails.

Claims (1)

(57) [Claims] 1. A cement-based cured product plate and a waterproof material layer disposed on the surface thereof are laminated and fixed, the waterproof material layer comprising a base material mainly composed of asphalt and 8.8 to 40% by weight of reinforcing short fibers. And are uniformly dispersed and mixed, and the short fibers are oriented in a plane direction parallel to the asphalt layer, and a non-woven fabric is laminated on both sides of a dense asphalt composition layer having a thickness of 3 mm or more. Characteristic composite board for building base materials.