JP2003062519A - Method for coating intumescent fireproof coating material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for coating an intumescent fireproof coating material capable of efficiently providing a flat finish face. SOLUTION: The coating method forms a layer to be coated so that a recess part of a coating material layer has the thickness of a projection part thereof or more after forming the coating material layer unevenly, and smoothly polishes the layer to be coated after drying and hardening the layer to be coated. In the method, the coating material layer is formed with the intumescent fireproof coating material, and the Taber's abrasion loss of the layer to be coated is 0.1-5.0 g. Furthermore, when the carbonizing temperature of the coating material layer is compared with that of the layer to be coated, the layer to be coated is carbonized at the lower temperature.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for coating a foam fire-resistant paint for coating a steel material such as a steel frame used in a structure typified by a building with a foam fire-resistant paint for finishing.

[0002]

2. Description of the Related Art Conventionally, various fireproof coating materials have been used for the purpose of delaying the temperature rise of steel materials used in structures from the heat of a fire. In recent years, in addition to those that form an air insulation layer with inorganic fibers such as rock wool, asbestos, and ceramic fibers, and fireproof coating materials such as calcium silicate board, lightweight cement mortar, and gypsum board, foamed fireproof paint is often used. Is coming.

This foamed refractory paint is disclosed in Japanese Patent Laid-Open No. 5-8631.
No. 0, JP-A-5-70540 and JP-A-6-1.
As described in Japanese Patent No. 6975 and the like, a coating film is foamed by a high temperature such as a fire to form a vapor phase-containing heat insulating layer, thereby obtaining a heat insulating effect and exhibiting fire resistance performance.

This foam-type fire-resistant coating material has a film thickness of about 2 mm and has a fire-resistant property, and it is aesthetically preferable due to its thinness, the amount of the foamed fire-resistant coating material used is small, and the coating work efficiency is excellent. It is often used because it is. Foam-type fireproof paint is often applied by spraying with a spray gun or the like.

[0005]

However, in the case of coating by spraying using a spray gun or the like, when a film thickness of about 2 mm is secured in order to obtain a predetermined fire resistance performance, the coating can be efficiently performed once. However, in many cases, the coating film has an uneven surface, and it is often not possible to obtain a flat finished surface like steel materials such as steel frames.

When a flat finished surface such as steel material such as steel frame is to be obtained, it can be obtained by coating several thin films of several μm to several hundreds of μm, but this leads to a long construction period. And may not be efficient. In addition, considerable skill is required to uniformly coat a steel frame having a complicated shape such as an H shape or an L shape. Therefore, a foamed refractory sheet in the form of a sheet is disclosed in JP-A-2000-1925.
No. 70 publication. By using such a sheet-like material, it is possible to obtain a fire-resistant property and a flat finished surface.

However, when manufacturing a foamed fireproof sheet, special manufacturing equipment is required, and the manufacturing process is laborious unlike the foamed fireproof paint. Further, it may be difficult to attach the foamed fireproof sheet to a steel frame having a complicated shape such as an H shape or an L shape. The present invention has been made by paying attention to the problems existing in the prior art as described above. It is an object of the present invention to provide a method for coating a foamed refractory paint capable of efficiently obtaining a flat finished surface.

[0008]

In order to achieve the above-mentioned object, a method for coating a foamed fire-resistant paint according to a first aspect of the invention is such that after a paint layer is formed in an uneven shape, the concave portion of the paint layer is Form the coating layer so that it is thicker than the thickness of the convex part of the paint layer,
A coating method in which the coating layer is dried and cured, and then the coating layer is polished smoothly, wherein the coating layer is formed of a foamed refractory coating, and the Taber abrasion loss of the coating layer is 0.1 to 5 That is, it is 0.0 g.

According to a second aspect of the present invention, there is provided a method for coating a foamed refractory paint, wherein the coating layer and the coating layer are carbonized at a lower temperature when the coating layer and the coating layer are compared in carbonization temperature. It is to be.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below. The present invention is to form a coating layer in a concave-convex shape, then form a coating layer so that the concave portions of the coating layer are equal to or larger than the thickness of the convex portions of the coating layer, and after the coating layer is dried and cured, the coating layer is formed. The coating layer is formed by a foamed refractory coating, and the Taber abrasion loss of the coating layer is 0.1 to 5.0 g.

First, the foamed fire-resistant paint for forming a paint layer is one which is applied to steel materials used for steel-framed columns and beams, and the fire-resistant performance is obtained by the applied and hardened paint layer. The paint layer formed on the foamed fire-resistant paint is often formed so as to cover the outer surface of steel or the like, and when the steel or other material coated with the paint layer is exposed to a fire, it foams to form the heat insulation layer. To form. This foamed and formed heat insulating layer prevents buckling of steel materials and the like due to a rapid temperature rise such as fire.

The foamed fire-resistant paint is mainly composed of a synthetic resin, a polyhydric alcohol and a flame-retardant foaming agent. When the surface temperature reaches about 200 ° C. when exposed to fire, foaming starts,
A porous heat insulating layer having a thickness of several tens of times the dry film thickness at room temperature is formed. The mechanism of this foaming is that the inorganic acid released from the flame-retardant foaming agent that has been heated is combined with the carbonized layer forming material to form a carbonized layer. On the other hand, the synthetic resin of the paint melts and the foaming agent decomposes in the form of simultaneous or subsequent progress, generating gas such as carbon dioxide gas, ammonia, and steam, making the synthetic resin foam and expanding the carbonized layer. The vapor phase-containing heat insulating layer having a thickness of tens of times the initial dry film thickness is formed.

The synthetic resin, which is one of the main components of the foamed fire-resistant paint, has the function of providing adhesion and weather resistance of the coating film at room temperature and bonding the main components to each other. Layer, and one that forms the gas phase-containing heat insulating layer. Any kind of synthetic resin can be used. Examples include melamine resin, acrylic resin,
Examples thereof include alkyd resin, vinyl chloride resin, vinyl acetate resin, urethane resin, epoxy resin, silicone resin and polyester resin. These resins may be used alone, or may be copolymerized and used by mixing them. Further, as the form of these resins, those dissolved in an organic solvent or those dispersed in water as an emulsion can be used.

From the viewpoint of environmental pollution, the above synthetic resin is preferably used as an emulsion dispersed in water. Synthetic resin emulsions are used because water evaporates at the time of coating and drying the foamed fireproof paint, does not pollute the atmosphere, and is easily available.

The polyhydric alcohol dehydrates and condenses with a flame-retardant foaming agent, which will be described later, and forms a foamed layer by decomposition gas of the flame-retardant foaming agent. Examples of the polyhydric alcohol include pentaerythritol, dipentaerythritol, tripentaerythritol, polypentaerythritol, triethylene glycol, sorbitol, resorcinol, glycerin, trimethylolmethane, trimethylolpropane, diethylene glycol, propylene glycol, hexamethylene glycol, etc. Is exemplified. Among them, one or more kinds arbitrarily selected from pentaerythritol, dipentaerythritol, tripentaerythritol and polypentaerythritol are preferable. Further, dipentaerythritol is more preferably used because it has excellent water resistance.

The flame-retardant foaming agent is one which, when the paint layer formed of the foamed fire-resistant paint is heated, generates a gas such as ammonia gas and simultaneously lowers the temperature of the coated surface by an endothermic reaction. . This flame-retardant foaming agent preferably uses ammonium phosphate and / or ammonium polyphosphate. It is also possible to use a product whose surface is coated with melamine or the like in microcapsules. Further, the flame-retardant effect is brought about by bonding with the polyhydric alcohol or the synthetic resin, and the foam layer having the stitch structure is formed.

It is also possible to add titanium dioxide or expansive graphite to the foamed refractory paint. The addition of titanium dioxide promotes the bonding of the foam layer due to its catalytic effect, so that the foam layer having a high shape retention property is formed. The crystal form of titanium dioxide includes anatase type and rutile type, and anatase type titanium dioxide is preferably used. The anatase type titanium dioxide further promotes its catalytic effect.

Expandable graphite has a property that when heated, the compound existing between the graphite layers is thermally decomposed, and the whole expands. By adding expandable graphite, a foamed fireproof with a thinner film and a higher fireproof performance. A paint is obtained. The coating film to which expansive graphite is added expands rapidly due to heating during a fire or the like, thereby improving the heat insulation performance of the foam layer. As such expandable graphite, graphite acid sulfate,
Examples thereof include sodium graphite, potassium graphite, halogenated graphite, graphite oxide, aluminum chloride graphite compound, and ferric chloride graphite.

Further, the foamed refractory paint may contain other components in addition to the above components. Other components can be contained within a range that does not impair the effect of the foamed fireproof coating. As its components, fillers and extenders such as calcium carbonate, clay, silica sand, aluminum hydroxide, alumina, silica, inorganic fiber, rock wool, halogen-based, phosphorus-based, antimony trioxide-based flame retardants and defoaming agents. Agents, dispersants, surfactants such as wetting agents, plasticizers, film-forming aids, solvents such as antifreezing agents, color pigments, metal soaps, stabilizers, thickeners for viscosity / viscosity adjustment, preservatives, There are antifungal agents. The foamed refractory paint composed of the above materials can be obtained by a conventional method such as stirring and mixing.

Next, the coating layer will be described. The type and material of the coating material forming the coating layer are not particularly limited, and it is necessary that the Taber-type wear loss is 0.1 to 5.0 g. This coating layer is in a state of being formed by applying a coating material, followed by curing and drying.

This Taber type wear reduction is for quantitatively judging the easiness of polishing the coating layer. The larger the Taber abrasion loss, the easier the polishing workability of the coating layer. If the Taber abrasion loss is 0.1 g or more, polishing can be easily performed. However, if the Taber abrasion loss is too large, the coating layer becomes brittle. When the Taber abrasion loss is 5.0 g or less, the coating layer can be prevented from becoming brittle, and the polishing unevenness in the polishing process is small.

That is, the Taber type wear reduction is 0.1 to
Within the range of 5.0 g, the coating layer can be easily polished and the coating layer does not become brittle. The Taber-type wear loss amount is more preferably in the range of 0.1 to 2.0 g, and the polishing workability of the coating layer is good, and brittleness can be further prevented.

The Taber-type wear reduction is based on JIS-K560.
It was measured according to the method for measuring the wear resistance by the wear ring method in the mechanical properties of coating films in the general paint coating test method specified in 0. In this measurement method, the test body of the coating layer formed by the target coating material is attached to a rotating horizontal disk, a wear wheel is attached to this, a test load of 1 kg is applied, and the test body is rotated, and the test at that time is performed. This is a test method for evaluating the degree of wear of the body. Rotation speed is 100r
pm, and the difference between the weight of the test body at the start of the test and the weight of the test body at the end of the test is taken as the wear reduction.

Examples of the coating material capable of forming the coating layer as described above include a paint, a coating material or a putty material containing a synthetic resin and a filler as main components. As the synthetic resin which is one of the main components of the covering material, a synthetic resin used for foamed fireproof paint can be used, and it is preferable to use the same kind of synthetic resin as the foamed fireproof paint. By using the same kind of synthetic resin as the foam fire-resistant paint, the adhesion with the paint layer formed by the foam fire-resistant paint becomes excellent.

As the other main component, the filler,
Materials such as calcium carbonate, talc, clay and silica sand are often used. The particle size of this filler is 1.0 to 5
The range of 0 μm is preferable, and the coating material using the filler in this range has good polishing workability and does not make the coating layer brittle. Further, the coating layer is preferably carbonized at a temperature lower than the foaming start temperature of the paint layer formed of the foamed fireproof paint. As described above, the coating layer is carbonized before the coating layer is foamed, so that it is difficult to prevent the coating layer from foaming.

Next, a coating method using each coating composition having the above structure will be described. First, the foamed fireproof paint is applied to the steel material of the steel frame columns and beams, which are the objects to be painted. Further, there is no problem even if the rust preventive paint or the primer is applied before the foamed fireproof paint is applied.

This coating can be carried out by a commonly used coating method such as spray coating, roller coating, trowel or spatula coating. Of these painting methods,
Spray coating is preferably used because of high coating efficiency such as high coating speed and the required film thickness can be coated a small number of times. The film thickness of the paint layer of the foamed fireproof paint is appropriately selected and determined according to the fireproof performance required for the article to be coated. But in many cases,
The average film thickness is about 1 mm to 5 mm, and the range has a sufficient fire resistance.

By the above-mentioned coating method, a paint layer of foamed fireproof paint is formed. The formed paint layer is uneven. Next, after forming the uneven coating layer,
A coating layer is formed of a coating material so that the concave portions are larger than the convex portions. As a method for forming the coating layer, the coating material can be applied by coating in the same manner as the foamed refractory paint.

After the coating layer is dried and cured, the coating layer is polished smoothly. Sandpaper, sanders, grinders, milling cutters, and the like are used as polishing tools and devices used for this polishing. In particular,
Sanders and grinders are preferably used. further,
After smooth polishing, it is possible to apply a coating material for the purpose of protecting the coating layer, imparting a color tone, and the like, which is often preferred.

As described above, according to this embodiment, the following effects are exhibited. -After forming the coating layer in a concavo-convex shape, the coating layer is formed so that the concave portion of the coating layer is equal to or larger than the thickness of the convex portion of the coating layer,
A coating method in which the coating layer is dried and cured, and then the coating layer is polished smoothly, wherein the coating layer is formed of a foamed refractory coating, and the Taber abrasion loss of the coating layer is 0.1 to 5 When it is 0.0 g, a flat finished surface can be efficiently obtained.

When the carbonization temperatures of the coating layer and the coating layer are compared, the coating layer carbonizes at a lower temperature, which makes it difficult to inhibit foaming of the coating layer. · Excellent adhesion to the paint layer formed by the foamed fireproof paint by using the same kind of synthetic resin as the synthetic resin used for foamed fireproof paint, which is one of the main components of the coating material Becomes

When the particle diameter of the filler, which is the other main component of the coating material, is in the range of 1.0 to 50 μm, the polishing workability is good and the coating layer does not become brittle. Further, by coating the paint after smooth polishing, the coating layer can be protected and the color tone can be imparted.

[0033]

Embodiments of the present invention will be described in detail below. The foamed refractory paints used in these examples and comparative examples are mainly composed of synthetic resin, polyhydric alcohol, and flame-retardant foaming agent.

The synthetic resin is an acrylic resin type synthetic resin emulsion, and the polyhydric alcohol is dipentaerythritol. Moreover, ammonium polyphosphate was used as the flame-retardant foaming agent. Further, it contains anatase type titanium dioxide and graphite acid sulfate, and as its components, a defoaming agent, a dispersant, a wetting agent, a plasticizer, a film-forming aid, an antifreezing agent, and a thickening agent. .

The foamed refractory paint constructed as described above was painted using a resin gun which is often used for painting the outer wall. The painted object is 90 cm in length and 90 in width.
The iron plate had a thickness of 3.0 cm and a thickness of 3.0 mm and had been subjected to anticorrosion treatment. The formed paint layer of the foamed fire-resistant paint has a crater shape with an average thickness of 2.5 mm and an unevenness height of 0.7 mm.

Four such test pieces were prepared, the coating materials used in Examples and Comparative Examples were applied, and the ease of polishing was judged. The covering material used in Example 1 is a putty material containing a commercially available acrylic resin-based synthetic resin emulsion and calcium carbonate as a main component, in which the wear loss of the covering layer formed by the covering material is 0.2 g. And, I made a spatula. Further, in Example 2, the amount of wear reduction is 3.8 g.
This is a coating material mainly composed of acrylic resin-based synthetic resin emulsion, silica sand, and calcium carbonate, and was coated with a resin gun.

As Comparative Example 1, mortar having a wear loss of 0.04 g and containing cement silica sand as a main component was applied with a trowel. Further, in Comparative Example 2, the wear loss was 5.8 g.
The acrylic resin-based synthetic resin emulsion and the coating material containing calcium carbonate as the main component were coated with a resin gun. The coating material was applied so that the concave portions were larger than the convex portions on the uneven coating layer to form the coating layer.

The wear loss is measured in accordance with the method for measuring the wear resistance by the wear ring method in the mechanical properties of coating films in the general paint coating test method specified in JIS-K5600. . The test conditions were as follows: a test load of 1 kg was applied, the rotation speed was 100 rpm, and the wear wheel was H-22.
It was used. The difference between the weight of the test body at the start of the test and the weight of the test body at the end of the test was measured.

Next, after the test bodies of Examples 1 and 2 and Comparative Examples 1 and 2 are cured and dried, the test bodies are smoothly polished. As a polishing tool used for this polishing,
I used a sander. This sander uses a finishing sander for finishing, and the finishing sander has a # 8 count.
A sandpaper of 0 was attached and polishing was performed. To determine the ease of polishing, the time required for polishing and the degree of finish were used as standards.

In Example 1, it takes about 15 minutes,
It has a smooth finish. In Example 2, it took 10 minutes and a smooth finish was obtained. On the other hand, in Comparative Example 1, the polishing process was performed for about 30 minutes, but the polishing could not be finished smoothly. In Comparative Example 2, although polishing was performed for about 5 minutes, there were several places where the paint layer of the foamed fireproof paint was exposed. Further, the coating layer was brittle, and the coating layer could be removed during the polishing process, so that the surface could not be finished smoothly.

Further, these test bodies were heated, and the degree of foaming of the paint layer formed of the foamed fireproof paint was visually confirmed. In the test bodies of Examples 1 and 2, it was found that the coating layer was foamed after the coating layer was carbonized, and the fire resistance was sufficient. However, in the test body of Comparative Example 1, since the coating layer was not carbonized, the paint layer was not foamed and had no fire resistance. Moreover, in the test body of Comparative Example 2,
There were several places without a coating layer, and the paint layer foamed sufficiently. From this example and the comparative example, it is possible to efficiently obtain a flat finished surface by the Taber-type wear loss of the coating layer being 0.1 to 5.0 g, and the performance of the foamed fire-resistant paint. It turns out that it does not hinder the.

Next, the technical idea which can be understood from the above embodiment will be described below. The coating method according to any one of claims 1 and 2, wherein the synthetic resin, which is one of the main components of the coating material, is the same type of synthetic resin as that used in the foamed fireproof paint. . As a result, the adhesion to the paint layer formed of the foamed fireproof paint is excellent.

The coating according to any one of claims 1 to 3, wherein the particle diameter of the filler, which is another main component of the coating material, is in the range of 1.0 to 50 µm. Method. As a result, the polishing workability is good and the coating layer does not become brittle.

The coating method according to any one of claims 1 to 3, characterized in that the coating material is applied after smooth polishing. As a result, the coating layer can be protected and the color tone can be imparted.

[0045]

Since the present invention is constructed as described above, it has the following effects. According to the method for coating a foamed fire-resistant paint of the invention described in claim 1, a flat finished surface can be efficiently obtained.

According to the method for coating the foamed refractory paint of the invention described in claim 2, in addition to the effect of the invention described in claim 1,
It becomes difficult to inhibit the foaming of the paint layer.

Claims (2)

[Claims] 1. A coating layer is formed in a concavo-convex shape, and then a coating layer is formed so that the concave portion of the coating layer is equal to or larger than the thickness of the convex portion of the coating layer, and the coating layer is dried and cured, and then coated. A coating method for polishing a layer smoothly, wherein the paint layer is formed of a foam fire resistant paint, and the Taber abrasion loss of the coating layer is 0.1 to 5.0 g. How to paint. 2. The method for coating a foamed refractory paint according to claim 1, wherein, when the carbonization temperatures of the coating layer and the coating layer are compared, the coating layer carbonizes at a lower temperature.