JP2001226636A - Paint composition, coated film structure therewith, and its coating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light-weight paint composition that can effectively use the waste incineration ash as a finishing material for buildings and the like in which the coated film is shock-resistant in thin layers, provide a coated film structure of freely selectable color tones without leakage of hazardous substance, and an application method therefor. SOLUTION: The objective paint composition includes 3-60 wt.% of waste incineration ash on the solid basis of the organic binder, additionally may contain an inorganic binder. This inorganic binder is preferably cement. In the coated film structure and the application method utilizing the paint composition, The surface of a material to be coated is coated with the paint composition and the resultant paint composition layer formed by the paint composition is coated with a top coat and the paint film and the top coat layer are laminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paint used for finishing such as painting of a structure such as a building, and a surface covering material using the paint. The present invention relates to a coating composition using ash, a coating film structure thereof, and a coating method thereof.

[0002]

2. Description of the Related Art Hitherto, various proposals have been made for a method of treating waste incineration ash, and there have also been proposals for using waste incineration ash. For example, kneading with cement to form a block or plate is disclosed in JP-A-7-155732.
Japanese Patent Application Laid-Open No. 8-35640 discloses that the mixture is kneaded with water glass to form a molded product. As a solidification method, Japanese Patent Application Laid-Open No. 7-155724 discloses that the mixture is kneaded with slaked lime and formed by pressure.

[0003]

However, the conventional method of using waste incineration ash is to solidify only into an inorganic binder such as cement, water glass and slaked lime.
The solidified material is hard, thick, and heavy. For this reason, it has been difficult to use it for makeup of structures such as buildings. That is, the impact resistance of the thin film is inferior, the film is thick, and the object is heavy, and a load is applied to the structure. These are because they were solidified by the inorganic binder.

[0004] Since waste incineration ash may contain harmful substances, the harmful substances may leak. Furthermore, those solidified using waste incineration ash,
It has a unique color tone of dark red and black incineration ash.

The present invention has been made by focusing on the problems existing in the prior art as described above. The purpose is to use the waste incineration ash as a finishing material for buildings and the like, which can be used effectively, and that the coating film has impact resistance in a thin film and is a light-weight coating composition, It is an object of the present invention to provide a coating film structure free of harmful substances from the coating film and having a free color tone and a coating method therefor.

[0006]

In order to achieve the above object, the coating composition according to the first aspect of the present invention comprises a waste incineration ash of 3 to 60% by weight based on the solid content of the organic binder. %
Is characterized by containing.

[0007] The coating composition of the invention according to claim 2 further contains an inorganic binder. According to a third aspect of the present invention, there is provided a coating film structure comprising: a coating composition layer formed from the coating composition according to the first or second aspect on the surface of an object to be coated; And a paint layer to be formed.

According to a fourth aspect of the present invention, there is provided a coating film formed from a top coating after the coating composition according to the first or second aspect is formed into a predetermined shape, cured and dried. The layers are stacked.

According to a fifth aspect of the present invention, there is provided a coating method comprising applying the coating composition of the first or second aspect to the surface of the object from the side of the object and curing and drying the composition. Is formed, and then a top coat is applied to the surface and cured and dried to form a paint layer.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail. The coating composition is characterized by containing waste incineration ash in an amount of 3 to 60% by weight based on the solid content of the organic binder.

First, industrial waste incineration ash is one of the main components of the coating composition. This is incineration ash generated by incineration, which is one of the methods for treating waste discharged as garbage. The main components are metals such as iron, zinc, copper and manganese. Cadmium as a minor component,
May contain harmful substances such as lead, arsenic, and cyanide.

The components of industrial waste incineration ash may fluctuate depending on where and when the incineration ash is collected. This is often affected by industrial waste emissions, types and local industries.

The organic binder is an essential component of the coating composition, and a thermoplastic resin or a thermosetting resin can be used. Examples of the thermoplastic resin include acrylic resin, vinyl acetate resin, vinyl chloride resin, urethane resin, and alkyd resin.Examples of the thermosetting resin include epoxy resin, polyester resin, phenol resin, melamine resin, and silicone resin. These can be used singly or copolymerized.

Further, a resin obtained by dissolving the resin in a solution or a resin dispersed in a solution is used. A synthetic resin emulsion in which a resin is dispersed in water is preferably used because of ease of use, ease of production, availability, and miscibility with an inorganic binder of the coating composition.

The synthetic resin emulsion may be a general one which can be produced by a usual polymerization technique such as emulsion polymerization. For example, there is a synthetic resin emulsion manufactured from a resin such as an acrylic resin, a styrene resin, a urethane resin, a silicone resin, a fluorine resin, and an epoxy resin.

From the viewpoint of suitability for paint, physical properties of the coating film, availability, and the like, an acrylic synthetic resin emulsion or an acrylic styrene synthetic resin emulsion produced from an acrylic resin or a styrene resin is preferably used. This synthetic resin emulsion is appropriately selected and used according to the use and performance of the coating composition. If necessary, a thermosensitive gelling agent may be used.

In a synthetic resin emulsion using a heat-sensitive gelling agent, when a certain temperature is reached, the synthetic resin emulsion gels and loses the fluidity of the synthetic resin emulsion. The gelation temperature can be changed according to the amount and type of the heat-sensitive gelling agent. Therefore, it can be set to a required temperature.

The glass transition temperature of the resin used in the synthetic resin emulsion is preferably in the range of -40 to 50 ° C., but it is necessary to select a synthetic resin having an appropriate glass transition temperature according to the use of the coating composition. Can be.

This coating composition contains waste incineration ash in an amount of 3 to 60% by weight based on the solid content of the organic binder. When the incineration ash of industrial waste is less than 3% by weight, the coating composition after curing and drying becomes easily flammable.
If the amount of the incinerated ash is more than 60% by weight, harmful substances contained in the incinerated ash may leak, and the durability of the cured coating composition may be impaired. . Industrial waste incineration ash is more preferably in the range of 3 to 30% by weight, leakage of harmful substances contained in the incineration ash is less likely to occur, and the durability of the coating composition after curing and drying is further improved.

Further, the coating composition may contain an inorganic binder. The inorganic binder improves the adhesive strength of the inorganic coating surface, and can reduce the organic content of the coating film, so that heat resistance and flame retardancy can be imparted, cement, silica sol, Examples include lithium silicate, alumina sol, calcined gypsum, lime, blast furnace slag, and the like.

Among the above-mentioned inorganic binders, cement is more preferably used in terms of availability and cost. Cement is a mineral powder that reacts with water and hardens,
Portland cement, white cement, mixed cement, special cement, etc. can be broadly classified. is there.

In the present invention, any kind of cement can be used. Commonly available ordinary Portland cement or white cement is preferably used. The inorganic binder preferably contains 5 to 70% by weight of the solid content of the inorganic binder with respect to the solid content of the organic binder. When the amount is less than 5% by weight, it is impossible to improve the adhesive strength to the inorganic coating surface, or to impart heat resistance and flame retardancy. If it is more than 70% by weight, the weight of the coating film will increase. A range of 5 to 50% by weight is more preferable.

The coating composition of the present invention comprises, as other additives, a low-boiling alcohol, a high-boiling solvent, a surfactant,
Ingredients generally used in the production of paints, such as thickeners, white pigments, coloring pigments, fillers, lightweight aggregates, flame retardants, preservatives, fungicides, antialgal agents and the like can be used. High-boiling solvents are used as film-forming aids and antifreezing agents, and surfactants are used as defoamers, dispersants, wetting agents and the like. Thickeners are used for viscosity and viscosity adjustment. Examples of the filler include calcium carbonate, aluminum hydroxide, alumina, silica sand, and fibers. Examples of the lightweight aggregate include foamed clay, pumice, perlite, styrofoam powder, shirasu balloon, hill stone, foam of glass powder, and the like. Examples of the flame retardant include halogen-based, phosphorus-based, and antimony trioxide-based compounds.

As the top coat, a water-based paint or a solvent-based paint such as an acrylic resin, a silicone resin, a urethane resin, or a silicone acrylic resin is used. This top coat can be appropriately selected according to the application and performance.

By applying the top coat, leakage of harmful substances contained in the incinerated ash does not occur more,
Improves the weather resistance of the coating surface of the coating composition, protects the coating surface of the coating composition such as preventing stains, and can freely change the color tone of the coating surface of the coating composition. . Further, by changing the type of the top coating material, gloss can be given or, conversely, gloss can be removed.

The object to be applied is an object to which the coating composition is applied, such as a wall surface of a structure such as a building. In addition, a flexible material or a plate-like material having no flexibility may be used. Non-woven, woven,
There are glass cloth, paper, etc., and in the case of plate-shaped and non-flexible, plywood, ceramic siding, metal siding, ALC plate, extrusion molded plate, calcium silicate plate,
A GRC board, a PC board, etc. are mentioned.

On a wall surface of a structure such as a building, a coating composition can be directly used as a material for finishing the building as a base adjustment material for the wall surface or a main material for patterning. After applying the coating composition and curing and drying, a top coat is applied.

Flexible materials such as nonwoven fabrics, woven fabrics, glass cloths, papers and the like, plywood, ceramic siding, metal siding, ALC plates, extruded plates, calcium silicate plates, GRC plates, PC plates, etc. After applying the coating composition, curing and drying it, apply a top coat to the object, so that the object to be coated in advance can be attached to the wall of a structure such as a building. Material.

Further, when the coating composition is formed into a predetermined shape, cured and dried, and then a coating layer formed of a top coat is laminated, the coating composition can be formed into a free shape, and can be formed into a tile shape or a brick shape. By molding into a block shape or the like, a surface covering material to be attached to a wall surface or the like of a structure such as a building.

Next, a description will be given of a coating method for obtaining a coating film structure using the coating composition configured as described above. By the way, the coating composition can be formed on the surface to be coated by a normal coating method such as a brush, a roller, a spray, a trowel, and a spatula to form a coating composition layer. Is appropriately selected according to the conditions and is not particularly limited. In addition, as a shaping method for shaping the coating composition into a predetermined shape, there are shaping methods such as a casting method and a press forming method, and any forming method can be used. The method is not particularly limited.

After the coating composition layer formed from the coating composition or the shaped coating composition is cured and dried, an overcoat is applied. The application methods include brush, roller,
It can be applied by a usual application method such as spray, iron, and spatula. Further, the shaped coating composition can be immersed in the top coating to form a top coating layer.

As described above, according to this embodiment, the following effects are exhibited. -With respect to the solid content of the organic binder, the incineration ash of industrial waste contains 3 to 60% by weight, and the 3 to 30% by weight of incineration ash of industrial waste is in a more preferable range. A highly durable coating composition is obtained in which the cured coating composition does not easily burn and does not leak harmful substances contained in the incinerated ash.

The use of an inorganic binder, preferably the use of cement, can improve the adhesion to an inorganic coating surface and reduce the organic content of the coating film. , Heat resistance and flame retardancy.

A harmful substance due to the fact that the coating composition layer formed of the coating composition and the coating layer formed of the top coating are laminated on the surface of the coating object from the coating object side, That can be obtained in a free color tone without any leakage of water.

The paint composition is formed into a predetermined shape, cured and dried, and then a paint layer formed of a top coat is laminated, so that there is no leakage of harmful substances and free color tone Is obtained.

When the organic binder is a synthetic resin emulsion, and preferably an acrylic synthetic resin emulsion, it is possible to easily obtain a coating material having good suitability for paint and physical properties of a cured film, and furthermore, an inorganic binder. A material excellent in miscibility with the material can be obtained.

By containing 5 to 50% by weight of the solid content of the inorganic binder with respect to the solid content of the organic binder,
It is possible to improve the adhesive strength of the inorganic coating surface, to provide heat resistance and flame retardancy, and to suppress an increase in the weight of the coating film.

[0038]

EXAMPLES The above embodiment will be described more specifically with reference to examples. The incineration ash of sewage sludge was used as the waste incineration ash. The incineration ash is dark red. As other components, an antifoaming agent, a wetting agent, a thickener and the like were used. In addition, a film thickening aid was added as necessary, and the compounding water was used.

As the organic binder, an acrylic synthetic resin emulsion having a solid content of 50% was used, and when an inorganic binder was contained, an ethylene-vinyl acetate synthetic resin emulsion having a solid content of 50% was used.

As the inorganic binder, ordinary Portland cement was used, and white sand was used as a filler. Table 1 below shows the formulations of Examples and Comparative Examples. The content of the organic binder and other components is a solid content.

[0041]

[Table 1] The coating compositions of Examples 1 to 3 and Comparative Examples 1 to 3 were poured into a mold made of silicone rubber having releasability, and were cured and dried to prepare test specimens. The test piece is 6
It is 200 mm wide and 200 mm thick and 5 mm thick. A top coat of a solvent type acrylic resin was applied to the entire surface of the test piece to obtain a test body. After measuring the weight of these test pieces, the leakage of harmful substances was confirmed, and the impact resistance was confirmed.

Since the top coat of the solvent type acrylic resin was white, the red test piece was a white test piece. In this leak test, a test body (unit: g) and deionized water (unit: ml) having an initial pH of 4.0 are mixed at a weight-volume ratio of 1:10. The mixed sample solution is stirred at normal temperature and normal pressure for 24 hours, and then allowed to stand for 30 minutes.
After the sample solution was centrifuged at 3000 rpm for 20 minutes, the supernatant was filtered through a membrane filter having a pore size of 0.45 μm to obtain a filtrate, which was used as a test solution. Verify what leaked into this test solution.

The impact resistance was determined by freely dropping the test piece from a height of 50 cm onto an asphalt-paved floor surface and verifying the degree of breakage of the test piece. Table 2 shows the weight of the test specimen, the results of the leak test, and Table 2.

[0044]

[Table 2] Combustion tests were performed on the test pieces of Example 1, Example 2, and Comparative Example 1. In this combustion test, the flame of a lighter was brought close to the test body, and the time required to ignite the test body was measured. The ignition time of the specimen of Example 1 was 30 seconds, and the ignition time of the specimen of Example 2 was 60 seconds. On the other hand, the ignition time of the test piece of Comparative Example 1 was 15 seconds. It can be seen that Comparative Example 1 is easy to burn because the amount of resin is large. It can be seen that in Example 2, the cement was contained as the inorganic binder, so that it was harder to burn as compared with Example 1.

The weight of Comparative Example 2 is higher than that of Example 2 because the content of the inorganic binder is large. Further, regarding the impact resistance, the specimen was hardened due to the large amount of the inorganic binder, and the corner of the specimen was cracked.

In Comparative Example 3, the content of the incinerated ash was large, and as a result of the leak test, there was a leak. The coating composition of Example 3 was formed into a tile shape, an overcoat was applied, and used as a surface covering material. The molding method is to pour the coating composition into a silicone resin mold, heat dry at 50 ° C. for 72 hours,
After curing and drying, it was released from the mold. Thereafter, a top coat was applied with a brush and air-dried at room temperature to obtain a surface covering material. The overcoat was white and was made of water-based silicone acrylic.

Calcium carbonate was added as a filler to the coating composition of Example 2 in an amount 10 times the solid content of the organic binder, and an appropriate amount of blending water was added to use as a base adjustment material for the ALC base. Was. The base adjustment was sprayed with a ricin gun. After the base adjustment, a white enamel paint composed of a solvent type acrylic resin was applied as a top coat paint by a spray gun.

Next, the technical ideas that can be grasped from the above embodiment will be described below. -The coating composition according to claim 2, wherein the inorganic binder is cement. This makes it possible to improve the adhesive strength to the inorganic coating surface and to reduce the organic content of the coating film, so that heat resistance and flame retardancy can be easily imparted.

The coating composition according to claim 1 or 2, wherein the organic binder is a synthetic resin emulsion, preferably an acrylic synthetic resin emulsion. With this configuration, it is easy to manufacture and obtain,
Further, a material excellent in miscibility with the inorganic binder can be obtained.

The coating composition according to claim 2, wherein the content of the inorganic binder is 5 to 50% by weight based on the solid content of the coating composition. This makes it possible to improve the adhesive strength of the inorganic material to the surface to be coated, impart heat resistance and flame retardancy, and suppress an increase in the weight of the coating film.

[0051]

The present invention is configured as described above, and has the following effects. According to the coating composition of the invention according to claim 1, waste incineration ash can be effectively used by using it as a finishing material for buildings and the like, and its coating film has impact resistance in a thin film, and is lightweight. It becomes.

According to the coating composition of the invention described in claim 2, in addition to the effects of the invention described in claim 1, it is possible to improve the adhesive strength to the surface to be coated with an inorganic material and to improve the content of the organic component in the coating film. Can provide heat resistance and flame retardancy.

According to the coating film structure of the third or fourth aspect of the present invention, no harmful substances leak from the coating film, and the color tone is free.

According to the coating method of the fifth aspect of the present invention, there is no leakage of harmful substances from the coating film and a free color tone can be obtained.

Continued on the front page F term (reference) 4D075 AE03 CA50 DA06 DC02 EB03 4J038 CC021 CD021 CD091 CF021 CG141 DB001 DD181 DG031 DL031 HA166 HA376 HA446 HA456 HA496 KA06 KA08 KA09 MA08 MA10 NA01 NA11 NA14 NA15 NA27 PA18 PC10 PC03 PC03

Claims (5)

[Claims] 1. A coating composition characterized in that the waste incineration ash contains 3 to 60% by weight based on the solid content of the organic binder. 2. The coating composition according to claim 1, further comprising an inorganic binder. 3. A coating composition layer formed from the coating composition according to claim 1 or 2 and a coating layer formed from a top coating composition are laminated on the surface of the coating object from the coating object side. A coating structure characterized by being made. 4. The coating composition according to claim 1 or 2 is applied to the surface of the object to be coated from the side of the object to be coated, cured and dried to form a coating composition layer. A coating method characterized by applying and curing and drying to form a paint layer. 5. A coating film structure characterized by laminating a coating layer formed of a top coat over the entire surface of the coating composition according to claim 1 or 2 formed into a predetermined shape.