JPS5837268B2 - wall material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement of wall materials, and more specifically, it has excellent nonflammability, heat resistance, light resistance, strong adhesion to the substrate, and especially water resistance. The present invention also relates to a wall material having extremely excellent whitening resistance.

Examples of materials that have traditionally been used as wall materials include earth, plaster, plaster, cement mortar, and materials made from resin. Each product has some kind of drawback, and the current situation is that nothing perfect has yet been developed.

That is, for example, in the case of a material made from soil, if it is applied thickly, it will cause cracks and it will take a long time to dry, which poses a major problem in terms of construction time.

Furthermore, in the case of cement mortar, plaster, etc., cracks often occur after drying, causing water leakage, and the curing time is also unreasonably long, so it is difficult to say that they are efficient wall materials for construction.

Furthermore, synthetic resins are generally satisfactory in terms of water resistance and shortened construction time, but because synthetic resins are organic, they have poor heat resistance and are combustible in the event of a fire. There are drawbacks such as the possibility of burning and the generation of toxic gas.

The wall material of the present invention is an inorganic wall material developed and completed as a result of various researches with the aim of solving all the drawbacks of the conventional wall materials mentioned above.
It is characterized by adding 10,010 mol of magnesium chloride or magnesium sulfate per mole, and further adding an appropriate amount of water.

That is, the wall material according to the present invention is completely nonflammable because it is inorganic, does not generate any toxic gas even in the event of a fire, has strong adhesion to the substrate, and is water resistant and light resistant. It has excellent properties such as excellent hardness and whitening resistance, and it also cures quickly, which can significantly shorten the construction period.It has solved all of the drawbacks of conventional wall materials. It is an ideal wall material.

It is possible to knead lightly calcined magnesia with an aqueous solution of magnesium chloride or magnesium sulfate, leave it to harden and use it as a wall material, or pour this kneaded mixture into a mold and harden it to use it as a molded product. It has already been known as so-called "magnesia cement".

However, even after complete hardening, conventional cured magnesia cement has two major defects, the so-called "sweat phenomenon" and the "salt blow phenomenon."

In other words, it has poor water resistance, and the cured product has a "sweating phenomenon" in which water droplets are generated on the surface when it is humid, and a "whitening phenomenon" in which white powder is generated on the surface when it is dry, so it is not suitable for practical use. In order to avoid this, the surface is coated with a water-resistant synthetic resin material, and only a small amount of it can be used as an indoor painting material or wall material. The reality is that this is only the case.

The inventor of the present invention regretted this and conducted various studies, and as a result, he completed the present invention with the aim of completely eliminating the above two major defects found in conventional magnesia cement.

By the way, according to many researchers, if you add an aqueous solution of magnesium chloride or magnesium sulfate to light oxidation magnesia and knead it, the mixture will harden in a few hours, and the composition of this hardened material will be similar to that of Mg. 0-M8・YH20,
2MS'0・3MguX-YH20,3MtO-MIX-
It is said to be YH20 etc.

(Here, X is Ct2 or SO4, Y is 14 or 16)
.

Therefore, conventionally, it has been common knowledge that at least 1 mole of magnesium chloride or magnesium sulfate is added to 1 mole of light-burnt magnesia in magnesia cement, and this mixing method has always been adopted.

However, based on the results of various research and experiments over many years, the inventor of the present invention has determined that in order to harden lightly burnt magnesha,
Not only is it not necessary to add such a large amount of magnesium chloride or magnesium sulfate to 1 mole of light burnt magnesia, but rather, adding such a large amount causes deterioration of water resistance and whitening resistance. By adding a small amount of magnesium chloride or magnesium sulfate (about 100 to nmol) to 1 mol of light chloride magnesia, a cured product with sufficient practical strength can be obtained. We have discovered the surprising fact that the cured product can have complete water resistance and whitening resistance for the first time by adding magnesium or magnesium sulfate.

In the present invention, the amount of magnesium chloride or magnesium sulfate to be added to 1 mole of light magnesium magnesia (MrO) was determined to be in the range of 1 to 1 mole10010 based on the results of many experiments. This is because it has been found that the strength and fire resistance of the solidified material (wall material) can be maintained to a sufficiently satisfactory level.

1. In other words, the hygroscopicity of the solidified material obtained by adding more than n moles of magnesium chloride or magnesium sulfate to 1 mole of light morning magnesia is slightly hygroscopic when immersed in water. It disintegrates in a few days, and the consolidated products obtained by adding less than 100 moles of magnesium chloride or magnesium sulfate have good fire resistance after consolidation, but their mechanical The strength is extremely low, and the compressive strength in the case of 1 mol is about 5 kg/crL. Transverse bending 110 force is slightly 0. As a result of experiments, it was found that this was only about 5 kg/i and could not be put to practical use at all.

Furthermore, the addition of a very small amount of magnesium chloride or magnesium sulfate as in the present invention is used to add a small amount of aqueous resin to improve the physical strength of the magnesia cement after hardening and the adhesion to the substrate. It was also found that the addition of emulsions was possible.

On the other hand, in the case of conventional magnesia cement, since a large amount of magnesium chloride or magnesium sulfate is added, if a synthetic resin aqueous emulsion is added,
It was also found that it was completely impossible to add emulsion with the aim of improving strength and adhesion to the substrate because the emulsion immediately gelled or precipitated due to the concentrated salts.

Examples of the present invention will be described below.

Example 1 5 parts by weight of magnesium chloride hexahydrate crystals (MgC,e,2・6H20) were added to 100 parts by weight of lightly calcined magnesia (MfIO).
Add and mix 0 parts by weight (corresponding to the ratio of 2 mols of M?Ct to 1 mol of magnesia), 30 parts by weight of water, 150 parts of silica powder passed through a 100 mesh sieve, and 300 parts by weight of Kansui stone (2 liters). The mixture was thoroughly kneaded and applied to a wooden board and a straight board with a trowel to a thickness of 7 mm, and when left at room temperature of 25°C, it cured in about 3 hours, but no cracks appeared on the cured coated surface. I couldn't see it.

The adhesion strength to the substrate after being left for 3 days was 6.
．． It was very strong at 5kg/4 5.5}1/shrine.

Next, after immersing this test piece in water for one month,
I took it out and examined it, but there was no peeling or softening of the surface.
Even after drying this, no whitening phenomenon was observed at all.

Furthermore, after drying this test piece at 90°C for 2 hours,
No sweating phenomenon was observed even when the sample was kept in a constant temperature bath at 20° C. and 90% R-H for 3 days.

Comparative Example In order to compare with the above Example 1, a conventional magnesha cement formulation, that is, 100 parts by weight of lightly calcined magnesha was added with 1.0 parts of magnesium chloride hexahydrate crystals (MPC4/6H20).
0 parts by weight (corresponding to the ratio of 1 mole of F#C4Σ to 1 mole of magnesha), 50 parts by weight of water, 1
150 parts of silica powder passed through a 00 mesh sieve, Kansui stone (
A mixture of 300 parts by weight (300 parts by weight) was thoroughly kneaded and applied to a wooden board and a slate board with a trowel to a thickness of 71 nm, and when left at room temperature of 258C, it hardened in about 3 hours.

After leaving it for 3 days, it was immersed in water.
The part peeled off.

When it was immediately taken out of the water and examined, it was found that the paint film had softened and some swelling was visible.

When this was left to dry for 3 days at room temperature of -25°C, the coated surface turned white.

Furthermore, when this test piece was kept at 20 DEG C. and 90% RH for 2 days in a humid state, many water droplets were observed on the coated surface and a sweating phenomenon was observed.

Example 2 100 parts by weight of lightly burnt magnesha ('Mho), 25 parts by weight of magnesium sulfate heptahydrate crystals (MPSO, 7H20) (equivalent to a ratio of 1 mol of MP S 041 to 1 mol of magnesha), and 80 parts by weight of water. Parts by weight, aqueous emulsion of vinyl acetic acid and Eova copolymer resin (solid content 50%,
Boncourt 6620) manufactured by Dainippon Ink Industries ■ 10 copies,
Lightweight aggregate (Fuyolite No. 2: made by Fuyolite ■) 15
A test piece with a size of 40 mm x 40 mm x 150 mm was formed using a mold by adding and mixing 0 parts of the mixture and thoroughly kneading the mixture.

After curing, it was allowed to stand for 7 days and examined, and found that it had the same good properties as in Example 1.As a result of concrete examination of its physical strength, it had the following excellent strength characteristics. It showed thermal insulation properties.

Claims (1)

[Claims] 1 100% for 1 mole of light calcined magnesia (M?Q)
~ A wall material characterized by adding a bulk molar amount of magnesium chloride or magnesium sulfate and further adding an appropriate amount of water.