JPS583987B2 - Mineral coating composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in inorganic coating compositions for coating the surfaces of exterior materials such as slate.

Conventionally, adding cement to alkali silicate has been known for a long time as waterproof cement, but the reaction between the two is rapid and generates heat, leading to deterioration of the chemical and resulting in a decrease in waterproofing and adhesive strength. There was a drawback that it could not be used as an inorganic coating composition as it was.

The present invention was made in view of the drawbacks of the conventional example, and
The object of the present invention is to provide an inorganic coating composition that suppresses the reaction rate between alkali silicate and cement, cures at low or room temperature, does not cause deterioration of the agent, and does not cause a decrease in waterproofing power or adhesive strength. is to provide.

The present invention will be explained in detail below.

Alkali silicate is M20・XSiO2 (where M is an alkali metal, -N(CH20H)4, -N(C2H40H)4 or N
(CH3)2C6Hl5, and X is 0.2 to 9.0
represents a positive number.

), and examples of alkali metal salts include lithium silicate, sodium silicate, and potassium silicate.

If X, which represents the amount of silica in the water-soluble alkali silicate that serves as the binder for the inorganic coating composition, is less than 0.2, a film will not be formed on the surface of the exterior material, or even if a film is formed, the water resistance will be poor. Only an extremely poor film was obtained, while X
If X is thicker than 9.0, the alkali silicate becomes poorly soluble or insoluble in water, and the resulting film becomes brittle, so X is set to 0.
．． It is desirable to set it to 2 to 9.0.

The phosphates include primary phosphates, secondary phosphates, tertiary phosphates, sesquiphosphates, mechphosphates, etc., containing at least one metal selected from Ca, Zn, A6, and Fe.

As the cement, voltant cement, white cement, alkali cement, magnesia cement, etc. are used.

Therefore, an inorganic coating composition is prepared by blending one or more alkali silicate used as a binder with at least one phosphate of Ca, Zn, Al, and Fe and cement. The inorganic coating composition is used as an inorganic coating that is applied to the surface of an exterior material such as slate and cured at room temperature or a relatively low temperature. Because of the presence of different types of phosphates, the alkali silicate and cement slowly react and harden, generating little curing heat and preventing a decline in adhesive strength and waterproofing ability.

In addition, as for the blending ratio of the above-mentioned inorganic coating composition, it is desirable to mix 100 parts of alkali silicate, 10 to 50 parts of phosphate, and 10 to 80 parts of cement, and further add extender pigments such as silica and calcium carbonate, and organic and inorganic fibers. may also be blended.

As mentioned above, the present invention uses alkali silicate with Ca, Zn, and A.
6. Since the inorganic coating composition is made by blending at least one type of phosphate of Fe and cement, the phosphate can suppress the reaction rate between the alkali silicate and cement, and the phosphate can reduce the reaction heat. The composition can be cured at room temperature or relatively low temperature, and the waterproofing ability and adhesive strength of the film formed from the composition will not decrease due to reaction heat. .

The present invention will be explained in detail below with reference to Examples.

Example 1 Lithium silicate 50 parts by weight Potassium silicate 50 Monozinc phosphate
10〃Voltland cement
50〃Silica〃〃Water 2o〃After kneading the above mixture, it was applied onto a slate and baked and hardened at 50°C for 30 minutes.

As is clear from Table 1, the coating formed on the slate had good hardness, flame retardancy, and water resistance.

Example 2 Sodium silicate 50 parts by weight Lithium silicate 50 Aluminum metaphosphate
40 Magnesia cement
10〃Calcium carbonate 40〃Water
30 After kneading the above mixture, it was coated on a slate and baked and dried at 120°C for 10 minutes.

As is clear from Table 1, the coating on the slate had good hardness, flame retardancy, and water resistance.

Example 3 Potassium silicate 50 parts by weight Colloidal silica 50 Tertiary calcium phosphate
30 Aluminum sesquiphosphate
20〃Alumina cement 20 parts by weight Boltland cement 50〃Silica
60〃 Water 60〃 After kneading the above mixture, apply it to wood and leave at room temperature, RH 80%
The samples were cured for 24 hours in a curing box.

As is clear from Table 1, the coating on wood has hardness, vinegar flammability,
Both water resistance was good.

Example 4 Colloidal silicate strength 70 parts by weight Lithium silicate 20〃Iron phosphate
50〃Alumina cement
20〃Silica 30〃Water 50〃After kneading the above mixture, it was spray coated onto a slate.

Baking was carried out at 50℃RH100% for 3 hours, then 24 hours.
It was left indoors for an hour.

As is clear from Table 1, the coating on the slate had good hardness, flame retardancy, and water resistance.

Claims (1)

[Claims] 1. An inorganic coating composition comprising an alkali silicate, a phosphate of at least one of Ca, Zn, Al, and Fe, and cement.