JPS6031979B2 - Structure finishing agent coating method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION When applying an inorganic and/or organic finishing agent to the base surface of a concrete structure or a structure made of inorganic materials, the present invention can be applied by mixing a water-soluble solvent in advance. By applying a synthetic resin emulsion in a solubilized or semi-solubilized state as an undercoat to the base surface of the above-mentioned structure, and then applying a finishing agent on top of that, the adhesion between the base surface of the structure and the finishing agent layer can be improved. This relates to improving and preventing shedding, cracking, etc. in the finish layer.

Conventionally, when applying a finishing layer to the surface of concrete or inorganic materials, physical treatments such as roughening, solvent-based primer coating, or emulsion-type primer coating as in Japanese Patent Publication No. 44-18757 have been used. The roughening method does not always provide satisfactory adhesion, and solvent-based primers have excellent permeability into the substrate, but they contain water. It cannot be used under such conditions, and there are problems with solvent regulations and adhesion with the finishing layer.

Also, emulsion-type primers are good for the surface of lightweight concrete building materials, but on surfaces such as smooth concrete or inorganic materials, they become filtered, leaving only the resin on the surface and water penetrating into the interior. It looks like it did. Therefore, adhesion to the substrate is insufficient and it is not possible to completely prevent the finish layer from falling off, cracking, etc. The present invention has been made with the aim of improving the deficiencies caused by such subordinates.

That is, the present invention applies cement mortar and plaster to the base surface of concrete structures and structures made of inorganic materials.
Crushed stone (powder) using an inorganic finishing agent such as and/or a copolymer emulsion of an ethylenically unsaturated monomer as a binder.
, spray finishing agents containing extender pigments, coloring pigments, etc.
Or a synthetic resin that has been made solubilized or semi-solubilized by mixing a water-soluble solvent in advance when applying an organic finishing agent such as a paint that uses a copolymer emulsion of an ethylenically unsaturated monomer as a vehicle. By applying the emulsion to the base surface of the above-mentioned structure and applying the above-mentioned finishing agent on top of the emulsion, the undercoat resin penetrates into the base of the structure, creating a gitsuba effect, and at the same time applying the finishing agent. The objective is to improve the adhesion between the layers and to achieve alkali-resistant construction by selecting a primer. The undercoat used in the present invention is obtained by mixing a water-soluble solvent into a synthetic resin emulsion that becomes (semi) solubilized by mixing the solvent in an amount of 50% by weight or more based on the emulsion. As a synthetic resin emulsion, as an ethylenically unsaturated carboxylic acid copolymerized with about 0.5 to 5% of unsaturated carboxylic acid based on the weight of the resin, (
Preferred are meth)acrylic acid, crotonic acid, itaconic acid, maleic acid monoester, fumaric acid monoester, itaconic acid monoester, and the like.

Other ethylenically unsaturated monomers that can be copolymerized with the ethylenically unsaturated carboxylic acid include styrene, (meth)acrylate, saturated carboxylic acid vinyl ester, (meth)acrylonitrile, crotonic acid ester, dimaleate, difumarate, and ditaconate. , butadiene, isobutylene, etc. Water-soluble solvents include methanol, ethanol, and isof. Among these are methanol, ethanol, isopropanol, te-rebutanol, etc. be. The synthetic resin emulsion used as an undercoat can be produced by a conventional emulsion polymerization method using the above-mentioned ethylenically unsaturated carboxylic acids and other copolymerizable ethylenically unsaturated monomers, either alone or in combination. However, it is particularly preferable to use a resin emulsion having a composition that has alkali resistance.

In addition, when mixing a water-soluble solvent into a resin emulsion as described above to make the emulsion (semi) solubilized, methods such as diluting the emulsion with water in advance to prevent agglomeration are also used. . In this way, if the (semi-)solubilized emulsion with a particle size of 0.03 French or less is applied as an undercoat to the base surface of a concrete structure or inorganic material, and a finishing agent is applied on top of it, the finishing agent will be removed. It will not fall off or crack from the base material. Examples will be shown below, where parts or % represent parts by weight or % by weight.

Example 1 100 parts of a copolymer emulsion (concentration 45%, ammonia-neutralized product) consisting of 2.5 parts of acrylic acid, 5 parts of methyl methacrylate, and 5 parts of butyl acrylate was heated with isopropanol. 200 parts of the solution were gradually mixed in to obtain a clear solution with low viscosity (approximately 20 ps).

Apply this solution to the slate (application amount 500 pieces/final)
On the other hand, the above emulsion without isopropanol mixed in was applied in the same manner, and as a result of a peel test after drying, the emulsion without isopropanol peeled off, but the solution-coated product of this example did not peel off. Next, when the solution of this example was applied to a new concrete surface at a rate of 500 m/m and the emulsion without isopropanol was applied in the same manner, a peel test was conducted using adhesive tape. was peeled off, but the solution-coated product of this example did not peel off at all.

Example 2 The solution of Example 1 was applied to a commercially available cement roof tile for 50 evenings, and the emulsion of Example 1 diluted with water instead of isopropanol was coated 50 evenings/day, and the solution was simply soaked with water. Prepare 3 types and after drying for 2 hours, cement/sand: 1/3,
A mortar containing 50% water was flow-coated, and after 28 days it was allowed to fall from a height of 1, and the peeling status was observed.The solution coating of Example 1 was complete, and water was used instead of isopropanol. Some of the applied materials did not adhere well to the cement tiles and were peeling off.

Claims (1)

[Claims] 1 Synthesis in which a water-soluble solvent is mixed in advance to make it solubilized or semi-solubilized when applying an inorganic and/or organic finishing agent to the base surface of concrete structures and structures made of inorganic materials. A method for applying a finishing agent to a structure, which comprises undercoating a base surface of the structure with a resin emulsion, and applying a finishing agent thereon.