JPH042551B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a method for waterproofing a lightweight concrete board, in which a decorative layer is formed by pasting a waterproof member onto the surface of the lightweight concrete board.

Conventional technology Conventional concrete is a type of artificial stone,
It is made by mixing cement, sand, and gravel or crushed stone in a certain ratio, adding water, and kneading it. It is used for foundation work in civil engineering and construction, such as walls, roads, bridges, dams, and drainage pipes.

However, lightweight concrete boards have been proposed that are made by mixing cement, lime, silica sand, and aluminum powder in a certain ratio, adding water, and kneading the mixture.This concrete board is then coated or sprayed with paint and is generally used as a construction material. Although it is used, it is lightweight,
It has the advantage of being easy to handle.

Problems to be Solved by the Invention However, products molded using the former method are heavy and inconvenient to handle, and although they are fireproof, durable, and have heat insulation and heat retention effects, they tend to absorb water and permeate easily. There are problems such as accompanying expansion and contraction.
In the latter case, due to the alkaline action of the cement and lime on the base material, the aluminum powder generates hydrogen gas and bubbles before hardening, creating cavities on the inner and outer surfaces of the concrete, which tend to absorb water, making it unsuitable for use as a construction material. There is a problem.

Means for Solving the Problems This invention was made by focusing on these problems, and because porous materials such as lightweight concrete plates have a strong water absorption capacity, they cannot be used as general construction materials. However, for building users, concrete plates absorb water and moisture, which can damage items stored indoors. In order to prevent this, the present inventor has obtained the results of various studies. That is, the present invention forms a waterproof layer by pasting a waterproof member on the adhesive surface of a part of the lightweight aerated concrete board with a synthetic resin adhesive mixed with a filler. This is a method for waterproofing lightweight concrete plates, which is characterized by integrally forming a decorative layer on the surface of a waterproof layer.

The object used in the present invention is a lightweight concrete plate as described above. This concrete board is made by mixing cement, lime, silica sand, and aluminum powder in a certain ratio, adding water to the mix, and hardening it.Then, a filler is placed in a synthetic resin emulsion on the surface of the resulting lightweight concrete board. The purpose is to apply an adhesive coating material to a portion of the surface and side surfaces, and to form a waterproof layer and a decorative layer on the upper surface.

Function: The lightweight concrete board used in this invention is made by mixing cement, lime, silica sand, and aluminum powder in fixed proportions, and adding water to the mixture.The alkalinity of the cement and lime causes the aluminum powder to be mixed before hardening. The foam is gasified to create cavities inside and outside the structure, resulting in a lightweight concrete plate with water absorption properties.
Therefore, an adhesive containing a filler is applied to the outer wall surface and some of the side surfaces, and a waterproof layer and a decorative layer are further dried and formed on the upper surface.

Examples Examples of the present invention will be described below with reference to FIGS. 1 and 2.

When a conventional lightweight concrete plate 1, that is, cement, lime, silica sand, and aluminum powder is mixed and kneaded by adding an appropriate amount of water, it foams before hardening due to the alkalinity of the cement and lime, generating hydrogen gas. When dried, a water-absorbing lightweight concrete plate 1 with cavities formed within the structure is obtained.

An adhesive coating material 2 is applied to a part of the surface of the lightweight concrete board 1 as described above. A suitable mixing ratio for this adhesive coating material is one in which 5 to 150 parts of filler is mixed with 100 parts of synthetic resin emulsion. The following cases are considered as specific examples of the mixing ratio (1) and (2).

(1) Example Acrylic rubber synthetic resin emulsion 500 parts Filler (calcium carbonate) 700 parts Surfactant Antifoaming agent High boiling point solvent 1 part 1 part Viscosity agent (methyl cellulose) 1 part Water 30 parts (2) Example EVA-based synthesis Resin emulsion 500 parts Filler (calcium carbonate) 100 parts Viscous agent (methyl cellulose) 2 parts Surfactant (antifoaming agent) 3 parts Water 50 parts High boiling point solvent 1 part etc. Mixture shown in Examples (1) and (2) Adhesive coating material in proportion 2
When applied to the top surface of the lightweight concrete board 1, the filler fills the uneven surface of the concrete board 1 and acts as an adhesive, and the top surface has a waterproof layer 3 and a decorative layer 4 made of nonwoven fabric as a base material. Attach the parts and dry.

This waterproof member has a non-woven fabric as a base material, and the paint shown in formulation example (3) is applied to the top surface of the non-woven fabric to form a waterproof layer.
was formed, and the paint shown in Formulation Example (4) was further applied to the upper surface to form a decorative layer 4, and then dried.

Mixing example (3) Acrylic synthetic resin emulsion 300 parts Titanium oxide 50 parts Calcium carbonate 300 parts Antifoaming agent 0.1 part Pigment 0.3 parts Thickening agent 0.5 parts Mixing example (4) Styrene-acrylic copolymer emulsion 300 parts Titanium oxide 50 parts Carbonic acid Calcium 300 parts Pigment 0.3 parts Thickener 0.3 parts Antifoaming agent 0.1 part Pigment 0.3 parts Thickener 0.5 parts The paint mixed in the above ratio is used to form irregularities or patterns on the three surfaces of the waterproof layer. The decorative layer 4 is formed on the surface by spraying with a spray gun, or by using a plate type or a patterned roller type.

Effects of the invention Conventionally, lightweight concrete plates were coated with paint or sprayed with paint, but this method had the disadvantage of losing its strength because it was poor in waterproofness and easily peeled off. However, in the method of the present invention, the unevenness of the surface of the concrete plate is corrected using an adhesive containing a filler on the surface and side surfaces of the lightweight concrete plate, and the nonwoven fabric is applied to the upper surface of the concrete plate to function as an adhesive. The waterproof layer 3 and the decorative layer 4 are formed by strongly adhering the waterproof materials used as materials, increasing the strength and waterproofness of the concrete plate, and being extremely easy to handle. Since it forms a decorative layer 4, it has the characteristic of presenting a beautiful appearance.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which FIG. 1 is a partially cutaway slope view of a concrete plate of the present invention, and FIG. 2 is a cross-sectional view of the same. 1...Lightweight concrete board, 2...Adhesive, 3
...waterproof layer, 4...makeup layer.

Claims (1)

[Claims] 1. Waterproofing of a lightweight concrete board, characterized in that a synthetic resin adhesive mixed with filler is applied to a part of the outer peripheral surface of the lightweight concrete board, and a waterproof material is attached to the upper surface of the adhesive to form a decorative layer on the surface. Processing method.