JPS6013992B2 - Alkali silicate and curing agent compounds for architectural coatings such as wall materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in alkali acid and curing agent formulations for architectural coatings such as wall materials.

Alkali silicates, especially sodium silicates, are inexpensive, have strong adhesion to many materials such as wood, paper, concrete, metal, etc., and are nonflammable and heat resistant, so they are used as adhesives and paints. It is being considered useful as a raw material for etc.

Since alkali silicate is water-soluble, when using it as an adhesive or paint, it is added to an aqueous alkali silicate solution.
A so-called "curing agent" is added, and after the adhesion, coating, etc. processes are left at room temperature or heated, the adhesive layer and paint layer are cured by the added curing agent and made insoluble in water. It accomplishes the intended purpose.

For this purpose, an extremely large number of substances have been developed in research circles and patent applications have been filed as hardening agents for alkali silicate. At present, adhesive layers and paint layers with sufficient water resistance have not yet been formed or applied.

The present inventors have dealt with the above problem, and as a result of various research and studies to solve this problem, the present inventors have developed an alkali silicate material that has an appropriate curing speed, is completely cured at room temperature, and has an alkali silicate material after curing. Kawako discovered a hardening agent that could provide satisfactory water resistance.
The present invention was completed. That is, alkali silicate 100
0.5 to 100 parts of basic magnesium carbonate (M chick C03(OH)2・umbrella q.) per part by weight (solid content) and, if necessary, zinc oxide (Z: 0) and/or It has been confirmed that by adding 0.5 to 100 parts of calcium lotus acid (CaSi03), the alkali silicate after curing can form an adhesive layer and a paint layer that have the necessary and sufficient water resistance. .

Conventionally, as alkali curing agents for lotus acid, a large number of compounds have been used, such as inorganic substances such as silifluoride Q salts, condensed aluminum phosphates, shelf salts, sulfites, and aluminates, and organic substances such as amine shelf salts and acid amides. Substances have been researched and developed, and patent applications have been filed, but some of these have curing speeds that are too fast or too slow, and the so-called "convenient time" is inappropriate, so adhesives, There are drawbacks such as difficulty in painting operations, or even if the curing speed is appropriate, the water resistance of the cured product is insufficient, so when the adhesive layer or paint layer gets wet after curing, However, it had the serious drawback that it elutes and is stored away, completely losing its practical value.

The present invention completely eliminates these drawbacks, has a "handy time" that allows work such as gluing and painting to be performed without any trouble, and provides satisfactorily water resistance and weather resistance even after curing. The object of the present invention is to provide an alkali lotus acid and curing agent formulation for architectural coatings such as sillage materials.

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

In addition, in the examples, examples were shown in which zinc oxide and/or calcium reedate were added, but these two substances are not essential components in the present invention, and by adding and using these two substances together, the cured product can be improved. It was confirmed that even more complete water resistance could be imparted to the product.

[Example 1] Alkali silicate (X20・nSi02) [X is an alkali metal, n is 1 to 4.2], for example, JIS sodium oxalate No. 2 1
00 parts by weight, basic magnesium carbonate (M&C03(O
H) 2. Umbrella q. ) 3 parts by weight, zinc oxide (Zn0) 10
Add 12 parts by weight of water to an alkali silicate and curing agent compound for architectural paints such as wall materials, which consists of 30 parts by weight of lotus sand (Toyoura standard sand).
of wood, slate, concrete (Boltland cement: sand =
1:3), etc., by spraying two sides thick and painting with a trowel.

The contaminant's availability time is at a temperature of 23°C and an R. Day. It took about 3 hours at 60%, which was a convenient time suitable for painting work.
As a result of leaving the above painted surface at room temperature (230) for 2 hours,
After being completely cured, this sample was further left at room temperature for 3 days and was subjected to a performance test as an architectural inorganic paint material according to JIS-A-6910.The results are shown in the following table. [Example 2] Sodium silicate, for example, 100 parts of JIS No. 3 powdered sodium silicate, 10 parts of basic magnesium carbonate, calcium silicate (
An alkali silicate for architectural paint for wall materials, etc., consisting of 20 parts of CaSiQ) powder, 30 parts of Japanese sand (Toyoura standard sand), and 5 parts of synthetic resin powder (for example, Hoechst's "Movinyl DM-300" powdered acrylic resin). , 25 parts of water was thoroughly stirred into the curing agent formulation, and the mixture was mixed onto a slate plate. L. C. It was spray-painted on the surface of the board, etc., and was applied to a thickness of 2 ribs.

The potability time of the bran mixture is about 2 hours at room temperature (23°C), and after leaving the coated material at room temperature for 3 days, the above-mentioned JIS
As a result of quality inspection using 1A-6910, Example 1
As in the case of , all test items were passed. Note that water permeability was further improved by adding synthetic resin.

Claims (1)

[Claims] 1 Alkali silicate (X_2O·nSiO_2) [X is an alkali metal, ie, Li, K, Na, etc. n is 1 to 4.2] Basic magnesium carbonate (Mg_2CO_3(OH)
_2・4aq. ) An alkali silicate and curing agent compound for architectural coatings such as wall materials, characterized in that it contains 0.5 to 100 parts (in terms of solid content).