JPH0633667B2 - ALC board - Google Patents

Description

TECHNICAL FIELD The present invention relates to an ALC board suitable for an interior base material for a building which is lightweight and excellent in water resistance.

[Prior art]

Conventionally, gypsum board (JIS A6901) has been widely used as an interior base material for buildings, but the gypsum board softens when it absorbs water and weakens its strength, making it difficult to resist water. It has the drawback of being relatively heavy at 0.9.

Steam-cured lightweight aerated concrete (hereinafter referred to as ALC) has a bulk specific gravity of 0.45 to 0.55, is lightweight and non-combustible, has excellent water resistance and workability, but is inferior in flexural strength, so it is generally reinforced such as reinforcing bars and metal laths. It was necessary to put the material inside, and it could not be used as a thin plate suitable for the interior base material. Further, in order to increase the strength of such an ALC thin plate, as shown in, for example, JP-A-51-93930 and JP-A-51-131517, the surface layer portion thereof is covered with glass fiber or reinforced with a metal lath. Attempts have been made, but they have not reached the level where they can be put to practical use because of the high cost.

[Problems to be solved by the invention]

The present invention solves the above-mentioned problems, is sufficiently lightweight because it does not contain reinforcing bars, is superior in yield strength to gypsum board as an interior base board, and has ALC's original properties of noncombustibility, water resistance, and workability. The object is to provide an ALC board with goodness.

[Means for solving problems]

In order to achieve this object, the present invention has an ALC thin plate having a thickness of 10 to 20 mm, which does not include reinforcing bars, metal laths, and reinforcing bars, and has one surface made of, for example, vinyl acetate, acrylic, urethane, or epoxy. Synthetic polymer adhesive, using a high tensile strength organic synthetic adhesive, such as kraft paper, a high tensile strength paper is adhered over the entire surface, other surfaces such as water glass, cement ALC using a high-strength inorganic adhesive mainly composed of an inorganic material such as mortar
It is a board.

In using the ALC board of the present invention, if the side using the high tensile strength organic synthetic adhesive is the tension side and the side using the high hardness inorganic adhesive is the compression side, sufficient yield strength is obtained. can get.

The thickness of the ALC thin plate that does not include reinforcing bars is preferably 10 to 20 mm, and if it is less than 10 mm, it easily breaks during the manufacturing process. The type of paper to be applied is not particularly limited as long as it has a high tensile strength, and the tensile strength is about 5 kg / c measured by the method of JIS P8113.
It is preferably about m or more.

The material to be attached to both sides of the ALC is not limited to the above-mentioned paper, and a cloth or other material can be used as long as it has a small elongation and a large tensile strength.

[Action]

When bending stress is applied to the thin plate, fracture occurs when either the tension side or the compression side reaches the allowable stress level. JIS A69 is the ALC thin plate that does not include reinforcing bars and has no paper attached to the surface.
According to 015.3, when measuring the breaking load with a sample size of 400 mm × 300 mm, it is about 5 kg for a thickness of 10 mm, about 19 kg for a thickness of 20 mm and about 25 kg for a plaster board of 9 mm thickness. Although much inferior to that of the ALC board, the ALC board of the present invention uses a high tensile strength adhesive on the pulling side, and since the high tensile strength paper is adhered over the entire surface, the bending resistance is large. Also, since the paper is pasted over the entire surface using an adhesive with high hardness on the compression side, the proof stress against compression increases and the value of the fracture load 1.5-2 times that of gypsum board is obtained. Obtainable.

〔Example〕

Examples 1 to 4 Vinyl acetate-based resin as an adhesive on one side of an ALC thin plate having a specific gravity of 0.5, a width of 60 cm and a length of 1.8 m, which does not include a reinforcing bar and has a thickness of 10 mm, which is manufactured according to a conventional ALC manufacturing method. Sumika Flex (Sumitomo Chemical, trade name) or Synthetic rubber latex struct bond 105P (Mitsui Toatsu Co., trade name) is brushed at a rate of 300 g / m ² , and a thickness of 0.17 m
m kraft paper (manufactured by Daishowa Paper Industries, trade name Olympus, tensile strength 6 kg / cm measured by the method of JIS P8113) is attached, and on the other side, No. 3 silicate (made by Hokkaido Soda as a compression side adhesive) ) Or Cipotak K (Chubu Kogyo, trade name A
Brushed with LC adhesive cement, a mixture of cement and sand with resin emulsion added at a dry weight of 300 g / m ² , and kraft paper with a thickness of 0.11 mm (tensile strength 4.7 Kg / c
m) was attached and dried at 50 ° C. for 12 hours to prepare an ALC board. After cooling in the room JIS A6901 (gypsum board) 5.
A bending test (sample size 400 mm x 300 mm) was performed according to 3, and an impact test (sample size 400 mm x 300 mm) was performed according to JIS A5410 (asbestos cement board) 5.4.
Further, the amount of deflection of the central portion of the test piece during the bending test was also measured. The test results are shown in Table 1.

Comparative Example 1 The same adhesive Sumikaflex # 510 used on the pull side of Example 1 was used on both sides of the same ALC sheet as in Example 1 and the kraft paper described in the previous example was used on each side. An ALC board was manufactured by using the same, and the same tests as in Examples 1 to 4 were performed.

Comparative Example 2 A commercially available gypsum board having a thickness of 9 mm was used to perform the same test as that of the example for reference. The test results of the comparative example are also shown in Table 1.

From the results in the above table, the ALC board of the present invention has a breaking load of 1.5 to 2 times and an impact load of 2 times to more than that of gypsum board which is generally used as a building interior base material. In the case of using an adhesive having low hardness on both sides of the ALC thin plate as in Comparative Example 1, there was almost no difference in breaking load compared with the gypsum board.

〔effect〕

According to the present invention, since the metal lath and the reinforcing bar are not included,
It is possible to provide a board that is cheaper, lighter in weight, and has better yield strength than gypsum board.

Claims (1)

[Claims] 1. A thickness of 10 to 20 that does not include metal laths or reinforcing bars.
mm ALC thin plate with high tensile strength organic synthetic adhesive on one surface and high hardness inorganic adhesive on the other surface. ALC board worn.