JPS5847545B2 - Architectural base material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a base material used when constructing mortar-coated walls, tile walls, etc. of buildings, and more specifically, a waterproof layer is provided on a plate-like base material such as plywood. It relates to a base material on which a layer made of a mixture of an inorganic binder such as cement and foamed synthetic resin particles is provided.

Conventionally, the general method for constructing mortar-painted walls in buildings is to first attach a lath base plate, then attach waterproof paper such as asphalt roofing paper on top of that, and then attach a wire mesh such as metal lath on top of that. A construction method in which mortar was applied after the coating was applied (hereinafter referred to as the lath wire mesh construction method) was used, but the groundwork in this method was done on-site and required manpower and time, and the mortar painting process also Undercoat (rubbing)/drying: Intermediate coating/drying 2nd coat/drying: 3
It requires two steps: undercoating, drying, topcoating, and drying, and this drying time requires at least 1 to 2 weeks, so the total construction period from applying the lath base board to the final finished size is extremely long. It had to become something.

Even with waterproofing after painting, it is difficult to completely prevent water from penetrating due to tears in the waterproof paper during the on-site construction process, and as a result, base boards, columns, foundations, etc. become damp, leading to rot and termites. They were often subjected to such harm.

As for cracks in the mortar after construction, the mortar layer is mainly attached to the wire mesh, and is only attached to the lath base plate in spots through the wire mesh. The main plate could not be held down, and cracks were inevitable.

To address these drawbacks, conventional methods have been developed in which a layer of rubber, asphalt, or synthetic resin is provided on the surface of a plate-like base material such as plywood, which has the functions of both waterproofing and mortar adhesion. There are materials that have a waterproof layer made of rubber or other material on the surface of the material, and then have an uneven layer of about 1 mm in diameter, mainly made of cement or inorganic aggregate, to improve adhesion to mortar. Groundwork work is simplified, construction time is shortened, and plate-like base materials such as plywood are firmly attached to pillars and studs of buildings, so they have the same effect as braced structures and have increased strength. It was also said that the occurrence of mortar cracks would be reduced.

However, in either case, three or two painting steps were required, similar to the usual lath wire mesh process, and this did not lead to a reduction in the construction period.

The reason for this is thought to be that the surface of the base material is smooth, so there is no need for the undercoating process (lassing and rubbing) that is carried out in the lath wire mesh construction method, but in the former case, the waterproof adhesive layer of K does not have water absorbency. If a large amount of mortar is applied, shearing will occur, and an undercoating process of about 2 to 4 mm will inevitably be necessary.

-1 In the latter case, even if the cement layer is about 1 cm thick, the absolute water absorption capacity of the layer is insufficient even if the cement itself has good water absorption, and the mortar cannot be applied thickly, making it possible to omit the undercoating process. That's because there wasn't.

Regarding cracks in the mortar mentioned above, this method increases the structural strength of the building and reduces the deformation of the base material, making it difficult for cracks to occur, but on the other hand, since the mortar layer is in close contact with the structure, The impact force applied to the structure is easily propagated, and can provide an opening for cracks to occur.

If the cement layer can be thickened using the latter method, water absorption will be improved and a large amount of mortar can be attached, but when cutting the base material, a hard cement layer will be cut, which will also increase the weight. There are disadvantages such as poor workability and efficiency, and the need for a large amount of labor.

Another type of base material using plywood as a base material7 is one in which a synthetic resin foam sheet mixed with inorganic powder and foamed is attached to the substrate1, but this shortens the construction period for the base work. Since water absorption is low, mortar cannot be coated thickly, and the painting process is required three or two times, so shortening of construction time cannot be expected. However, since the resin is relatively soft, it cannot withstand the drying shrinkage stress of the mortar, and the cracks caused by this deformation are generally less effective in preventing cracks.

The present invention has been developed in order to provide a base material for construction that solves the above-mentioned drawbacks of the conventional construction material, and consists of applying a waterproof layer on a plate-like base material such as plywood, and applying an inorganic bond such as cement on top of the waterproof layer. This is a base material that has a layer made of a mixture of wood and foamed resin particles, and this mixture layer has a large amount of fine voids, so it has good water absorption, and it is possible to apply a thick layer of mortar at once, reducing construction time. can be significantly shortened.

The mixed layer has a low specific gravity, and even if the layer is made thicker, the weight does not increase significantly, making it easy to transport.

Since soft foamed resin particles are mixed with cement, it is easy to cut and can be easily cut with a saw, giving it excellent workability.

Regarding cracks in mortar, it contains a large amount of material with a buffering effect, such as foamed resin particles, so the impact force from the structure is absorbed, and the cracked mortar is prevented from shifting due to dry shrinkage stress. Since the cement part forms a solid skeleton, this increases the structural strength of the building, reduces the deformation of the base material, and, together with the complete adhesion of the mortar to the base material, makes it extremely difficult for cracks to occur.

In addition, since the inorganic layer has good dimensional stability against moisture, warping of the base material due to the influence of moisture before and after mortar coating is absent or suppressed to a large extent, and a mortar-coated surface with a smooth surface can be obtained.

In addition, since it contains a large amount of foamed synthetic resin particles, it compensates for the inherent disadvantage of mortar, which has poor insulation properties, and improves the insulation properties of buildings.

The mixture layer has appropriate rigidity and plasticity, has good nail holding power, and has excellent properties such as being able to be nailed directly into the structure, and is easy to manufacture. It is also possible to use waste resin particles, making it extremely inexpensive.

When used alone, the mixture layer has low bending strength, similar to foamed concrete, etc., but in the case of the present invention, since it is composited with a wooden plate-like base material, the weak point is eliminated and a configuration with the minimum necessary thickness can be achieved. It has many features such as

The present invention will be explained in detail below.

FIG. 1 is a cross-sectional view of a base board for construction according to the present invention, and FIG. 2 is a perspective view thereof, in which 1 is a plate-shaped base material, 2 is a waterproof layer, 3 is a foamed synthetic resin coarse particle, 4. Foamed resin fine particles, 5.
6 indicates an inorganic binder, and 6 indicates a composite layer.

In addition to plywood, the plate-like base material of the present invention mainly uses wood-based materials such as fiberboard, particle board, wood wool boards, and honeycomb core plywood, but is not necessarily limited to wood-based materials. Any material can be used as long as it is light, has relatively high bending stress, and can be easily cut.

For the waterproof layer, any resin known as a waterproof material and used in paint film waterproofing methods may be used, but in particular, resin emulsions such as acrylic, ethylene/vinyl acetate, and polypropylene; styrene/butadiene rubber may be used. Synthetic rubber latex such as chloropyrene rubber, butyl rubber, acrylonitrile butadiene rubber, methyl acrylate butadiene rubber; Bituminous emulsion such as asphalt, tar, rubber asphalt; Mixture of butyl rubber and bituminous emulsion; It is desirable to have a mixed emulsion that is waterproof, has good adhesion to deaf cement, and can be easily applied with a coating device such as a normal roll coater or flow coater.

In cases where strict waterproofing is required, such as in areas with high humidity such as around bathrooms, a waterproof sheet for sheet waterproofing methods such as butyl rubber or synthetic resin such as rubberized asphalt can be used as a base material by using a primer etc. It can also be used as an adhesive waterproof layer.

The mixed layer of an inorganic bonding material such as cement and foamed synthetic resin particles (hereinafter referred to as the mixture layer) formed on the waterproof layer can be made of ordinary Boltland cement, plaster, etc. or ultra-fast hardening if required from line suitability. High alumina, high gypsum, fast-setting cements such as cement, thermosetting cement, etc. may also be used.

Depending on the application, if it is necessary to increase the bonding strength and flexibility of cement, use a water-based diversion such as synthetic resin emulsion or synthetic rubber latex with a solid content of 20% by weight.
It is also possible to mix within the range.

Furthermore, whether the thickness of the mixture layer is equal to the thickness of the base material, 1
If the material is bent or bent, it may cause warping or a decrease in the bending strength of the entire base material. It may be mixed in by 0.2 to 5% of the weight of cement.

The foamed synthetic resin particles may be any resin that can form a foam, such as styrene, urea, phenol, urethane, vinyl chloride, or polyethylene. The better the insulation and fire protection performance.

Foamed synthetic resin particles such as Amatano can be made from defective products and waste generated during manufacturing, such as polystyrene and polyethylene, which are used in large quantities for packaging materials and containers, and can be easily pulverized into granules. It also has the advantage of being able to be manufactured at extremely low cost.

The bulk specific gravity of the mixture layer after hardening is adjusted by the mixing ratio of foamed synthetic resin particles and cement, but it is 0.4 to 0.8 when used as a normal mortar base; high strength when the mortar coating layer is thick. Since material fracture strength of 0.8 to 1 is required.
．． 2; When finishing with a light material such as ricin finish directly on the base material, a material with a density of about 0.2 to 0.3 has good heat insulation performance and is suitable.

The particle size of the crushed foamed synthetic resin particles is related to the thickness and specific gravity of the mixture layer, but is generally in the range of 0.2 to 10 mm.

If you are aiming for a product with a low specific gravity, it is necessary to densely pack the foamed synthetic resin particles, and the smaller the particle size, the better, but if there are too many small-diameter particles, the contact area with the cement paste will become too large.
Since a portion of the resin is absorbed into the foam, the specific gravity does not decrease as much as expected, and it is necessary to also mix in appropriately large foamed resin particles.

In order to apply the mixture layer having the above-mentioned structure onto a dry or semi-dry plate-like base material with a waterproof coating, after adjusting the viscosity with water, coat the mixture layer with a continuous coating gun or knife coater to a thickness of 2 to 20 rrvn. 7. The product of the present invention is completed by curing and curing under room temperature and heating.

The base material of the present invention manufactured in this way can be used for mortar walls,
In addition to tiled walls, it can be used for interior walls such as gypsum plaster, dolomite plaster, plaster walls, high walls, sand walls, and fiber walls.

The present invention will now be illustrated by examples.

Example 1: Thickness: 7 mm, width: 910 mm, length: 18 mm, treated with antiseptic and insect repellent treatment
Apply acrylic emulsion (trade name, Tufftac NO. 200, manufactured by Sanyo Kokusaku Pulb Co., Ltd.) to 20 m of type ■ plywood using a roll coater at 250? /rr? After drying at 80°C for 5 minutes, spray the mixture formulated as shown in Table 1 evenly using a continuous rinsing gun to a thickness of 5 cm, and dry with hot air at 60°C for 10 minutes. It was poured with water and allowed to accumulate and harden for 3 days.

The obtained architectural base board was suitable as a base for mortar coating.

Example 2 An emulsion mainly composed of asphalt/polypropylene was applied with a roll coater to 300g/1f of plywood with a thickness of 5wn, width of 910wn, and length of 1820mm that had been subjected to insect repellent and antiseptic treatment. After drying at 80°C for 10 minutes, the mixture prepared in the proportions shown in Table 2 was continuously and evenly applied with a knife coater to a thickness of 80°C.
After curing by heating for 30 minutes at 1°C, the mixture layer at the periphery was chamfered with a groover so that joint treatment with caulking material could be easily performed. 1-, which was suitable.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a base plate for construction according to the present invention, and FIG. 2 is a perspective view thereof. 1...Plate base material, 2...Waterproof layer, 3.
. . . Coarse foamed resin particles, 4. Fine foamed resin particles, 5. Inorganic binder, 6. Composite layer.

Claims (1)

[Scope of Claims] 1. On a wood-based plate-like base material, a mixture of a resin emulsion, a rubber latex, a bituminous emulsion, a mixture of butyl rubber and a bituminous emulsion, a mixed emulsion of polypropylene and a bituminous substance is deposited. A construction base material comprising a waterproof layer and a mixture layer consisting of an inorganic binder and foamed resin particles. 2 Add particle size 0.2 to 10 mm to cement as a mixture layer.
The main component is foamed resin particles of 1, and the bulk specific gravity after curing is 0.
．． 2 to 1.2 rMn and a thickness of 2 to 20 rMn.