JPS6139468B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a wall base material with a structure that can prevent mortar walls from peeling off when finishing mortar walls on substrates such as plywood and noncombustible boards without using felt and metal lath. be.

Generally, when finishing a mortar wall on a substrate such as plywood or noncombustible board, to prevent the mortar wall from peeling off and to obtain a waterproof effect, felt and metal lath are pasted on the substrate and mortar is troweled on top. It is customary. Attaching felt and metal lath on site is time-consuming and does not save labor or shorten the construction period.

Conventionally, in order to save labor and shorten the construction period by eliminating the need to attach felt and metal lath on-site, incisions were made in the board itself, or resin mixed with coarse aggregate was roughly sprayed onto the board, or cement paste was applied to the board. There is provided a base material which is coated to create an uneven surface and has a structure having an uneven surface. However, although these improve the adhesion to the mortar wall by increasing the contact area due to the unevenness, there is no adhesion (wedge effect), so there is no risk of the mortar wall coming off.

Therefore, the present invention aims to provide a wall base material that can be produced in a factory, can be delivered to a construction site and immediately finished with mortar, has both adhesion and adhesion, and is free from the risk of mortar walls peeling off. More specifically, a base layer containing an adhesive material and a large number of meltable beads is formed on a substrate, and holes for mortar engagement by melting the beads are provided on the surface of the base layer. The company provides wall base materials. Note that in this application, melting refers to melting or melting.

According to the wall base material of the present invention, the surface irregularities are composed of mortar attachment holes with small openings and large interiors, so that the adhesiveness is improved by increasing the contact area with the mortar wall, and the mortar attachment is also improved. Not only can the holes provide anchoring properties and prevent the mortar wall from peeling off, but the structure has a large number of holes for mortar anchoring on a flat surface, so
It has the advantage of being able to be stacked during storage before construction, making it easy to handle and transport.

As the substrate, plywood, noncombustible board, etc. made of wood, wood and paper, synthetic resin, cloth, etc. can be used, and plywood is preferred because of its high strength. The adhesive material is cement, sand, etc., which is mixed with water and used as cement mortar.
When making this cement mortar, it is recommended to add an adhesive emulsion. When the emulsion is added, the emulsion penetrates into the plywood, improving the adhesion between the plywood and the cement mortar, and also improving the strength of the pores formed after melting a large number of mixed beads, improving the adhesion ( This increases the wedge effect and eliminates the risk of mortar walls falling off. In addition, by mixing the emulsion, the mortar becomes a water-impermeable layer, which can be expected to provide water-blocking effects to plywood. Emulsions include asphalt emulsions, vinyl acetate emulsions, ethylene-vinyl acetate copolymer emulsions, acrylic emulsions, mixtures or copolymers of these, and rubber latexes, which are stable emulsions when mixed with cement, and after curing. Any material that does not re-emulsify due to moisture may be used.

The beads to be melted may be polyethylene, polymethylstyrene, copolymers of styrene and isoprene, etc., styrenic resins such as polyethylene-modified polystyrene resin, or foamed polyethylene, polypropylene, vinyl chloride, polyurethane, etc. beads can be used. In the case of foam, when it is melted, its volume decreases and a space is formed, so there is no need to remove the melted material, making it easier to manufacture mortar anchoring holes. In particular, foamed polyethylene beads are preferable because there are fewer restrictions on solvents.

Hereinafter, the structure of the wall base material of the present invention and its manufacturing method will be explained in detail with reference to the drawings.

A cement mortar is made by adding water to a mixture of cement and sand. As mentioned above, it is advisable to add an emulsion at this time. The amount of emulsion added is 5 to 25 parts by weight per 100 parts by weight of cement.
Parts by weight (10 to 50 as an emulsion with a solids content of 50%)
Parts by weight) are preferable because they exhibit remarkable effects.
Meanwhile make a large number of meltable beads. The shape of these beads may be polygonal like crushed ones, but
A spherical shape is preferable because it has a large anchoring effect on average, and the particle size is suitably in the range of 1 to 10 mm, and 3 to 10 mm.
5mm is desirable. If it is less than 1 mm, the hole is too small and it is difficult for mortar cement to enter when finishing the mortar wall of the product of the present invention, and if it is more than 10 mm, the ratio between the opening size of the hole and the internal size is small, and the wedge effect is reduced in both cases. Moreover, if the particle size is large, the thickness of the base layer will also become large and the weight will increase, which is not preferable.

Next, add a large number of beads 1 to the cement mortar.
The mixture is sprayed onto the substrate 2 with a mortar gun or applied with a metal trowel and cured and dried to form a base layer 3 on the substrate 2 as shown in the first figure. After hardening and drying the base layer 3, beads 1 are formed using heat or a solvent.
is dissolved and removed to obtain the wall base material of the present invention shown in the second figure. Reference numeral 4 denotes a mortar attachment hole formed after melting a large number of beads 1.

If mortar is troweled onto the surface of the wall base material of the present invention having a large number of mortar attachment holes 4, the mortar will enter each hole 4 as shown in Figure 3, and after hardening and drying, the wedge effect will As a result, the mortar wall 5 is fixed and prevented from falling off.

In addition, when mixing a large number of beads 1 into cement or sand in advance, if a small amount of solvent is mixed into the beads, the beads and sand will stick to each other and become familiar, making it easier to align them in the base layer 3. This prevents it from coming off the surface.

Note that calcium carbonate and water-soluble plastic beads can also be used as beads in the present invention.
In short, any material may be used as long as it can be melted by heat or a solvent to form a space. When water-soluble plastic beads are used, a water-insoluble plastic material may be used as the fixing material.

Further, the substrate 2 and the base layer 3 may be firmly fixed to each other by providing a dovetail groove in the substrate 2 when forming the base layer 3.

Next, an example will be described.

Example: Make cement mortar by thoroughly kneading 100 parts of cement, 100 parts of finely powdered silica sand, and 60 parts of acrylic emulsion diluted to a concentration of 25%, and add powder with a particle size of 3 to 5 mm.
Equal volumes of spherical expanded polystyrene beads are mixed in and stirred well, and this is sprayed onto plywood at a rate of 2 kg/m ² using a mortar gun and allowed to harden and dry to form a base layer. The flame of a burner is applied to this base layer to dissolve and remove the expanded polystyrene beads. A mortar prepared by mixing 100 parts of cement, 200 parts of sand, and an appropriate amount of water was troweled onto a surface with numerous pores created by dissolving and removing expanded polystyrene beads, and after 28 days, a tensile test was conducted on the mortar wall. When I did this,
A tensile strength of over 20Kg/cm ² was obtained.

Example 1 kg of expanded polystyrene beads expanded 50 times
A mixture of 30 kg of silica sand and 0.2 kg of xylene is added and stirred rapidly, and the surface of the expanded polystyrene beads is locally dissolved by the xylene adhering to the surface of the silica sand, causing the expanded polystyrene beads and silica sand to adhere. This was mixed in an equal volume into the cement mortar of the example, stirred well, and then sprayed onto plywood at a rate of 3 kg/m ² using a mortar gun and hardened and dried to form a base layer. A mist of xylene is sprayed onto this base layer to dissolve and remove the expanded polystyrene beads. Mortar was troweled on the surface with many pores created by dissolving and removing expanded polystyrene beads in the same manner as in Example 1, and after 28 days, a tensile test of the mortar wall was performed, and the result was 20 kg/cm ² or more. Obtained tensile strength.

In this way, in the wall base material of the present invention, a base layer containing an adhesive material and a large number of meltable beads is formed on a substrate, and holes for mortar engagement are formed on the surface of this base layer by melting the beads. The mortar wall installed on the surface of the base layer can improve adhesion due to the increased contact area due to the large number of holes, and can prevent it from falling off due to the adhesion (wedge effect) due to the large number of holes. .

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the wall base material of the present invention during the manufacturing process, Figure 2 is a cross-sectional view of the wall base material of the present invention, and Figure 3 is a cross-section of the wall base material of the present invention with a mortar wall installed. It is a diagram. DESCRIPTION OF SYMBOLS 1...Multiple meltable beads, 2...Substrate, 3...Underlayer, 4...Hole for mortar attachment, 5
...Mortar wall.

Claims (1)

[Claims] 1. For walls, characterized in that a base layer containing an adhesive material and a large number of meltable beads is formed on a substrate, and holes for mortar engagement by melting the beads are provided on the surface of the base layer. Base material.