JP2000288466A - Heat insulating coating structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an outermost layer excellent in anti-fouling properties by providing a heat insulating coating film layer and the transparent outermost layer and forming a coating film layer containing a transparent resin part and a hydrophilic agent as the outermost layer. SOLUTION: This heat insulating coating structure is provided with the heat insulating coating film layer composed of a coating film forming resin of one or more kinds of acryl urethane resin, acryl resin, fluorine-containing urethane resin, fluororesin or an inorganic resin for coating and the transparent outermost layer. As the transparent outermost layer, the coating film layer containing the transparent resin components such as one or more kinds of acryl urethane resin, acryl resin, acryl silicone resin, fluorine-containing urethane resin, fluororesin or an inorganic resin for coating and the hydrophilic agent such as colloidal silica, polysiloxane, a water soluble organic polymer, a surfactant, a silane coupling agent or two of them is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal barrier coating structure which is excellent in durability of a thermal barrier coating and durability of a thermal barrier effect. More specifically, the present invention relates to a thermal barrier coating structure having a thermal barrier coating layer and a transparent outermost layer, wherein the transparent outermost layer is a coating layer containing a transparent resin component and a hydrophilizing agent.

[0002]

2. Description of the Related Art Conventionally, it has been known that a rooftop or a roof of a building receives direct sunlight, absorbs solar energy, and causes various obstacles. Especially in a building, the temperature of the roof surface rises remarkably due to the sunlight and the indoor temperature rises. Along with this, a decrease in habitability, an increase in air conditioning costs, and a decrease in quality of articles stored in the room occur. Increased air conditioning costs lead to power consumption and waste of natural resources. Conventionally, in order to solve these problems, a method of applying a thermal barrier paint to a roof or a rooftop surface has been used. However, in some cases, environmental conditions in the atmosphere are reduced, and soiling of buildings and civil engineering structures in urban areas is a major problem. These stains are said to be lipophilic stains caused by automobile exhaust gas and factory soot. In general, these stains are mostly of a black color, and these stains adhere to and accumulate on the surfaces of buildings and civil engineering structures, causing aesthetic and environmental deterioration. These stains adhere to the surface of the article coated with the thermal barrier paint as described above.
It is known that when deposited, its thermal barrier effect is significantly reduced. In order to prevent this, or to improve the durability of the thermal barrier paint, or to improve the appearance, a protective finish layer or surface finish layer is provided by top-coating another paint on the surface of the conventional thermal barrier paint. (Eg, Japanese Patent Publication No. 1-243636). However, the effect of the antifouling property is not sufficient with ordinary paints, and the heat shielding properties have been remarkably reduced with time.

[0003]

SUMMARY OF THE INVENTION According to the present invention, there is provided a thermal barrier coating structure having an outermost layer (top coat) excellent in antifouling properties and capable of maintaining the effect of thermal barrier coating for a long period of time. Can be.

[0004]

According to the present invention, there is provided a heat shielding film having a thermal barrier coating layer and a transparent outermost layer, wherein the transparent outermost layer is a coating layer containing a transparent resin component and a hydrophilizing agent. Related to paint structure.

[0005] The transparent outermost layer preferably further comprises a curing agent, a curing catalyst and / or a hydrolysis catalyst.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The thermal barrier coating layer in the present invention is formed by applying a conventionally known thermal barrier paint to a surface of a roof or the like via a primer layer if necessary. In the present invention, the thermal barrier paint is not particularly limited, and a known and commercially available thermal barrier paint can be used. However, as will be described later, when the outermost layer is formed directly on the surface of the thermal barrier coating, use a film-forming resin having excellent affinity, adhesion, and durability with the resin component constituting the outermost layer. Is desirable.

[0007] Examples of the coating film forming resin used for the heat shielding paint include one or more of acrylic urethane resin, acrylic resin, acrylic silicon resin, fluorine-containing urethane resin, fluorine resin, and inorganic resin for paint. can give.

[0008] The thermal barrier paint further contains pigments for reflecting solar energy, glass powder, silica powder, alumina powder, hollow glass beads, and the like. In addition, additives usually blended in paints may be blended.

The thermal barrier coating structure of the present invention is characterized in that a coating film having excellent transparency and antifouling properties is formed on the outermost layer (top coat).

The essential components of the outermost layer are a transparent resin component and a hydrophilizing agent.

Examples of the transparent resin component include one or more of acrylic urethane resin, acrylic resin, acrylic silicon resin, fluorine-containing urethane resin, fluororesin, and inorganic resin for paint. Among them, acrylic silicone resin, fluorine-containing urethane resin and fluorine resin are preferable, and fluorine-containing urethane resin and fluorine resin are particularly preferable because they have excellent durability, weather resistance and chemical resistance.

Examples of the acrylic urethane resin include those comprising a solvent-soluble acrylic polyol and an isocyanate-based curing agent.

Examples of the acrylic resin include a solvent-soluble acrylic copolymer having an acid value (acrylic lacquer) and an aqueous dispersion type acrylic copolymer.

Examples of the acrylic silicone resin include a solvent-soluble or aqueous dispersion type acrylic copolymer having an alkoxysilyl group in a side chain, and the like. It is preferable because it has excellent heat effect persistence.

As the fluorinated urethane resin, for example, a resin composed of a solvent-soluble fluorinated polyol resin and an isocyanate-based curing agent is preferable because of its excellent durability and heat-shielding effect.

Examples of the fluorine resin include a solvent-soluble vinylidene fluoride-based resin, an aqueous dispersion-type vinylidene fluoride-based resin, and a solvent-soluble fluorine-containing acrylic copolymer. Vinylidene fluoride resin and aqueous dispersion type vinylidene fluoride resin are durable, stain resistant,
It is preferable because of its excellent heat-shielding effect. Examples of the solvent-soluble vinylidene fluoride resin include Zeffle LC series and Zeffle SE series manufactured by Daikin Industries, Ltd.

Examples of the inorganic resin for coating include Bellclean manufactured by NOF Corporation, porcelain manufactured by Toupe Corporation, and Glasca manufactured by Nippon Synthetic Rubber Co., Ltd.

The particle diameter of the organic polymer particles in the organic polymer aqueous dispersion is, for example, 50 to 250 nm.
Preferably it is 80 to 200 nm and the particle size is 50 n
If it is less than m, the viscosity of the aqueous dispersion increases, and a high-concentration aqueous dispersion tends not to be obtained. If it exceeds 250 nm, the particles tend to settle and coagulate during storage of the aqueous dispersion.

The hydrophilizing agent added to the outermost layer has a function of making the surface of the outermost layer hydrophilic, making it difficult for dirt to adhere to the surface, and making it easy to wash off the dirt that has adhered to the surface by rain or the like. Examples of such a hydrophilizing agent include colloidal silica, polysiloxane, a water-soluble organic polymer, a surfactant,
Examples include a silane coupling agent or two or more of these.

The colloidal silica is produced, for example, by removing sodium from water glass (ion exchange method, acid decomposition method, peptization method), and has a primary particle diameter of 4 to 15%.
0 nm, preferably 5 to 50 nm, which is usually supplied as an aqueous dispersion and can be used as such.

When the resin component of the outermost layer is an anionic emulsion, colloidal silica which is on the basic side in a water-dispersible state is preferred from the viewpoint of good paint stability. As the basic colloidal silica, for example, non-stabilized silica (pH) commercially available under the trade names Snowtex-O, Snowtex-OL or Snowtex-CM40 (all manufactured by Nissan Chemical Industries, Ltd.)
7.0 or more) can be used. When the pH is reduced, not only the stability of the colloidal silica but also the stability of the coating when formed into a coating is reduced, and aggregation and gelation tend to occur.

In the present invention, the mixing ratio of the colloidal silica may be, for example, 1% of the solid content of the organic polymer aqueous dispersion.
The solid content of colloidal silica is 10 to 50 parts, preferably 20 to 50 parts, and more preferably 30 to 45 parts with respect to 00 parts (parts by weight, hereinafter the same). If the compounding ratio is less than 1 part, the surface hardness and adhesion tend not to be obtained, and if it exceeds 50 parts, the film formability of the coating film is not sufficient, and the gloss tends to further decrease.

Examples of the polysiloxane include alkoxypolysiloxanes such as methoxypolysiloxane, ethoxypolysiloxane, and methylmethoxypolysiloxane; and fluorine-containing polysiloxanes such as fluoroalkoxymethoxypolysiloxane. Among these, alkoxypolysiloxanes and fluorinated polysiloxanes, particularly methoxypolysiloxane and fluoroalkoxymethoxypolysiloxane are preferable from the viewpoint of excellent stain resistance and durability of the heat shielding effect. The mixing ratio of the polysiloxane is, for example, 1 to 40 parts, preferably 5 to 20 parts, of the solid content of the polysiloxane with respect to 100 parts of the solid content of the aqueous organic polymer dispersion.

Examples of the water-soluble organic polymer include water-soluble acrylic resin, water-soluble polyvinyl alcohol, polyethylene glycol and the like. Among these, a water-soluble acrylic resin and a water-soluble polyvinyl alcohol are preferable from the viewpoint of excellent stain resistance and hardness. The mixing ratio of the water-soluble organic polymer is the same as that of the polysiloxane.

The surfactant may be used alone, but is preferably used in combination with colloidal silica, polysiloxane or a water-soluble organic polymer.

As the surfactant, any of a cationic surfactant, an anionic surfactant, a nonionic surfactant, and an amphoteric surfactant can be used. Nonionic surfactants are preferred from the viewpoint that the coating film has low chargeability and excellent stain resistance.

Examples of the nonionic surfactant include an alkylbenzene type and a modified silicone type having a polyethylene oxide chain. Of these, modified silicones having a polyethylene oxide chain are preferred from the viewpoint of excellent stain resistance.

The mixing ratio of the surfactant is 0.1 to 10 parts, preferably 0.5 to 2 parts, per 100 parts of the resin component.

The silane coupling agent can be used alone, but is preferably used in combination with colloidal silica. Examples of the silane coupling agent include a polyether-modified silane coupling agent, an epoxy silane coupling agent, an isocyanate silane coupling agent, and an amine silane coupling agent.

In the present invention, it is preferable to blend a polyether-modified silane coupling agent together with colloidal silica. The purpose of blending the polyether-modified silane coupling agent is to improve the flexibility in addition to the adhesion to the thermal barrier coating, the weather resistance, chemical resistance, and film forming properties of the top coat when the coating is formed. Another object of the present invention is to stabilize an aqueous dispersion of a resin component and colloidal silica, particularly when obtaining a coating for the outermost layer, in addition to the effect of further improving the composition. The stabilizing effect of the aqueous dispersion is an effect that is not observed in other silane coupling agents.

Examples of the polyether-modified silane coupling agent include those represented by the following general formula (I):

[0032]

Embedded image

(Wherein R ¹ is an alkyl group, allyl group, aryl group or hydrogen atom having 1 to 9 carbon atoms, R ² is an organic group or hydrogen atom having 1 to 8 carbon atoms, and R ³ is 2 to 2 carbon atoms. 4
And R ⁴ is an organic group having 1 to 8 carbon atoms or a hydrogen atom, n is an integer of 1 to 10, and a is an integer of 0 to 2).

Specific examples of the polyether-modified silane coupling agent include, for example,

[0035]

Embedded image

[0036]

Embedded image

(N is an integer of 1 to 10),
In particular, from the viewpoint of stability, contamination, surface hardness, adhesion to the substrate, and water resistance

[0038]

Embedded image

Is preferred.

The addition amount of the polyether-modified silane coupling agent is 0.1 to 40 parts, preferably 1 to 30 parts, per 100 parts of the solid content of colloidal silica. If the amount is too small, the stability is reduced, and aggregation and gelation tend to occur.
If the amount is too large, the water resistance, surface hardness, adhesion to the substrate, etc. will be poor.

An epoxy silane coupling agent may be added in addition to the polyether-modified silane coupling agent. Epoxy silane coupling agents are particularly suitable when the resin component has an acid value. That is, the carboxyl group and the epoxy group in the resin react to improve the adhesion between the colloidal silica and the resin, thereby increasing the water resistance. Therefore, it is preferable to add the epoxy-based silane coupling agent at the final stage of preparing the paint for the outermost layer.

As the epoxy silane coupling agent, for example, a compound represented by the following general formula:

[0043]

Embedded image

(Wherein R ¹ , R ² , a and n are the same as those described above). Specific examples include, for example, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, γ-glycidoxypropylmethyldimethoxysilane,
γ-glycidoxypropyldimethylmethoxysilane, γ
-Glycidoxypropylmethyldiethoxysilane, γ-
Glycidoxypropyldimethylethoxysilane, γ-glycidoxypropylethyldimethoxysilane, γ-glycidoxypropyldiethylmethoxysilane, γ-glycidoxypropylethyldiethoxysilane, γ-glycidoxypropyldiethylethoxysilane, β − (3,4-
Epoxycyclohexyl) ethyltrimethoxysilane,
β- (3,4-epoxycyclohexyl) ethyltriethoxysilane, β- (3,4-epoxycyclohexyl) ethylmethyldimethoxysilane, β- (3,4-epoxycyclohexyl) ethyldimethylmethoxysilane, β- (3 4-epoxycyclohexyl) ethylmethyldiethoxysilane, β- (3,4-epoxycyclohexyl) ethyldimethylethoxysilane, β- (3
4-epoxycyclohexyl) ethylethyldimethoxysilane, β- (3,4-epoxycyclohexyl) ethyldiethylmethoxysilane, β- (3,4-epoxycyclohexyl) ethylethyldiethoxysilane, β-
(3,4-epoxycyclohexyl) ethyldiethylethoxysilane, 3-epoxypropyltrimethoxysilane, 3-epoxypropyltriethoxysilane, 3-epoxypropylmethyldimethoxysilane, 3-epoxypropyldimethylmethoxysilane, 3-epoxypropylmethyl Diethoxysilane, 3-epoxypropyldimethylethoxysilane, 3-epoxypropylethyldimethoxysilane, 3-epoxypropyldiethylmethoxysilane, 3-epoxypropylethyldiethoxysilane, 3-epoxypropyldiethylethoxysilane, 4
-Epoxybutyryltrimethoxysilane, 6-epoxyhexyltrimethoxysilane, 8-epoxyoctyltrimethoxysilane, 4-epoxybutyryltriethoxysilane, 6-epoxyhexyltriethoxysilane, 8
-Epoxy octyl triethoxy silane, etc., in particular, adhesion to a water-resistant substrate, coating film hardness, stain resistance,
Γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropylmethyldimethoxysilane, γ-glycidoxypropyltriethoxysilane, β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane because of their excellent pot life And β- (3,4-epoxycyclohexyl) ethyltriethoxysilane are preferred.

The amount of the epoxy-based silane coupling agent is 0.1 to 45 parts per 100 parts of the solid content of the organic polymer.
Parts, preferably 0.2 to 40 parts.

Further, other silane coupling agents described in, for example, JP-A-8-120210 may be further used in combination.

When an epoxy-based silane coupling agent is used in combination, it is preferable to add and mix the epoxy-based silane coupling agent to the above organic polymer aqueous dispersion immediately before use. In this case, the aqueous coating composition of the present invention is a two-part type having a first liquid composed of an aqueous dispersion of an organic polymer, colloidal silica, and a polyether-modified silane coupling agent, and a second liquid composed of an epoxy silane coupling agent. Water-based paint.

In the present invention, the hardness and water resistance of the coating film are determined.
It is preferable to mix one or two of a curing agent, a curing catalyst, and a hydrolysis catalyst in order to improve stain resistance and the like. The mixing ratio is 0.1 per 100 parts of the resin component.
1 to 50 parts, preferably 1 to 30 parts.

Examples of the curing agent include isocyanate-based curing agents and melamine-based curing agents. Of these, isocyanate-based curing agents are preferred from the viewpoint of workability and reactivity.

Examples of the curing catalyst include an aluminum compound and a tin compound.

Examples of the hydrolysis catalyst include aluminum alkoxide, aluminum chelate and alkyltin carboxylate, and among these, aluminum chelate is preferable because of its excellent stain resistance.

The coating for the outermost layer in the present invention may optionally contain, if necessary, additives known in the field of coatings. Other additives include, for example, UV absorbers, HAL
S, a film forming aid, a matting agent, and the like. Examples of the film-forming auxiliary include Texanol CS- available from Chisso Corporation.
In addition to 12, there may be mentioned diethyl adipate, butyl carbitol acetate and the like.

Next, specific examples of preferred embodiments of the coating composition for the outermost layer in the present invention will be described, but the present invention is not limited to these specific embodiments.

(A-1) (a-1) Fluorine-containing urethane resin or solvent-soluble vinylidene fluoride resin (b-1) Polysiloxane (A-2) (a-1) Fluorine-containing urethane resin Or solvent-soluble vinylidene fluoride resin (b-2) fluorine-containing polysiloxane (A-3) (a-1) fluorine-containing urethane resin or solvent-soluble vinylidene fluoride resin (b-1) Polysiloxane (c-1) Hydrolysis catalyst (A-4) (a-1) Fluorine-containing urethane resin or solvent-soluble vinylidene fluoride resin (b-3) Alkoxypolysiloxane (c-1) Hydrolysis Catalyst (A-5) (a-1) Fluorine-containing urethane resin or solvent-soluble vinylidene fluoride resin (b-4) Methoxyalkoxypolysiloxane (c-1) Hydrolysis catalyst (A-6) (a -1) Fluorine-containing urethane resin or solvent-soluble vinylidene fluoride resin (b -5) Methoxypolysiloxane (c-1) Hydrolysis catalyst (A-7) (a-1) Fluorine-containing urethane resin or solvent-soluble vinylidene fluoride resin (b-3) Alkoxypolysiloxane (c- 2) Aluminum compound or tin compound (A-8) (a-1) Fluorine-containing urethane resin or solvent-soluble vinylidene fluoride resin (b-4) Methoxyalkoxypolysiloxane (c-2) Aluminum compound or tin Compound (A-9) (a-1) Fluorine-containing urethane resin or solvent-soluble vinylidene fluoride resin (b-5) Methoxypolysiloxane (c-2) Aluminum compound or tin compound

(B-1) (a-1) Acrylic urethane resin (b-1) polysiloxane (B-2) (a-1) Acrylic urethane resin (b-2) Fluorine-containing polysiloxane (B-3) ) (A-1) Acrylic urethane resin (b-1) polysiloxane (c-1) Hydrolysis catalyst (B-4) (a-1) Acrylic urethane resin (b-3) Alkoxy polysiloxane (c-1) Hydrolysis catalyst (B-5) (a-1) Acrylic urethane resin (b-4) Methoxyalkoxypolysiloxane (c-1) Hydrolysis catalyst (B-6) (a-1) Acrylic urethane resin (b -5) Methoxy polysiloxane (c-1) Hydrolysis catalyst (B-7) (a-1) Acrylic urethane resin (b-3) Alkoxy polysiloxane (c-2) Aluminum compound or tin compound (B-8) (A-1) Acrylic urethane tree Fat (b-4) Methoxyalkoxypolysiloxane (c-2) Aluminum compound or tin compound (B-9) (a-1) Acrylic urethane resin (b-5) Methoxypolysiloxane (c-2) Aluminum compound or tin Compound

(C-1) (a-1) Acrylic silicone resin (b-1) Polysiloxane (C-2) (a-1) Acrylic silicone resin (b-2) Fluorine-containing polysiloxane (C-3) (A-1) Acrylic silicone resin (b-1) Borisiloxac (c-1) Hydrolysis catalyst (C-4) (a-1) Acrylic silicone resin (b-3) Alkoxypolysiloxane (c-1) Hydrolysis Decomposition catalyst (C-5) (a-1) Acrylic silicone resin (b-4) Methoxyalkoxypolysiloxane (c-1) Hydrolysis catalyst (C-6) (a-1) Acrylic silicone resin (b-5) Methoxypolysiloxane (c-1) Hydrolysis catalyst (C-7) (a-1) Acrylic silicone resin (b-3) Alkoxypolysiloxane (c-2) Aluminum compound or tin compound (C-8) (a- 1) Acrylic silicone resin (B-4) Methoxyalkoxypolysiloxane (c-2) Aluminum compound or tin compound (C-9) (a-1) Acrylic silicone resin (b-5) Methoxypolysiloxane (c-2) Aluminum compound or tin compound

(D-1) (a-1) Fluorine-containing resin emulsion and / or acrylic silicone resin emulsion (b-1) Colloidal silica (D-2) (a-1) Fluorine-containing resin emulsion and / or Acrylic silicone resin emulsion (b-1) Colloidal silica (d-1) Silane coupling agent (D-3) (a-1) Fluorine resin emulsion and / or acrylic silicone resin emulsion (b-1) Colloidal silica ( d-2) Polyether-modified silane coupling agent and / or epoxy group-containing silane coupling agent (D-4) (a-1) Fluorine-containing resin emulsion and / or acrylic silicone resin emulsion (b-1) Colloidal silica (C-3) Water-dispersible isocyanate (D-5) (a-1) Fluoro resin emulsion And / or acrylic silicone resin emulsion (b-2) water-soluble acrylic resin or water-soluble polyvinyl alcohol (D-6) (a-1) fluorine-containing resin emulsion and / or acrylic silicone resin emulsion (b-2) water-soluble Acrylic resin or water-soluble polyvinyl alcohol (c-3) Water-dispersible isocyanate

(E-1) (a-1) Acrylic resin emulsion (b-1) Colloidal silica (E-2) (a-1) Acrylic resin emulsion (b-1) Colloidal silica (d-1) Silane cup Ring agent (E-3) (a-1) Acrylic resin emulsion (b-1) Colloidal silica (d-2) Polyether-modified silane coupling agent and / or epoxy group-containing silane coupling agent (E-4) ( a-1) Acrylic resin emulsion (b-1) Colloidal silica (c-3) Water-dispersible isocyanate (E-5) (a-1) Acrylic resin emulsion (b-2) Water-soluble acrylic resin or water-soluble polyvinyl alcohol (E-6) (a-1) Acrylic resin emulsion (b-2) Water-soluble acrylic resin or water-soluble polyvinyl alcohol (c-3) Water-dispersible iso Aneto

[0059]

EXAMPLES Next, the present invention will be described more specifically based on examples, but the present invention is not limited to only these examples.

Example 1 A concrete slab having a thickness of 50 mm, a polystyrene foam sheet having a thickness of 30 mm, and a butyl rubber sheet having a thickness of 1.2 mm were sequentially laminated and bonded with a synthetic rubber adhesive, and a cool top # 3000N was placed on the butyl rubber sheet. Time interval of 3 hours with a white paint (water-based thermal barrier paint manufactured by Koatsu Gas Kogyo Co., Ltd.)
It was applied twice with an interval of not less than an hour, and was applied so that the final film thickness was 40.0 μm, thereby producing a 300 mm × 300 mm test plate.

Separately 100 parts of Zeffle LC-950 (a coating varnish made of a vinylidene fluoride copolymer and an acrylic resin, manufactured by Daikin Industries, Ltd.), 150 parts of butyl acetate
And 3.8 parts of Zeffle GH-100 (fluorine-containing polysiloxane) were added, and the outermost layer paint prepared by stirring well was spray-coated on the test plate to give a dry film thickness of 30 parts.
It was coated to a thickness of μm to obtain a thermal barrier coating.

The obtained thermal barrier coated plate was horizontally exposed at a height of 1 m from the roof surface for 6 months, and then the temperature rise of the butyl rubber sheet of the thermal barrier coated plate due to direct sunlight in summer was measured. And the difference from the outside air temperature (50 ° C.) is 1
It was 0 ° C.

Comparative Example 1 In Example 1, Zeffle GH-1 was used as the paint for the outermost layer.
A test plate coated with a heat shield was prepared in the same manner except that No. 00 was not added, and a similar heat shield experiment was performed. As a result, the temperature of the butyl rubber sheet was 50 ° C.
(° C.) was 20 ° C.

Example 2 Templex Primer EP (a coating type ceramic heat-insulating paint for a metal substrate manufactured by Asahi Glass Coat and Resin Co., Ltd.) was applied to the roof (color steel plate) of a small outdoor storage (Inaba Co., Ltd.). Paint) once with a brush and the film thickness is 40
A μm undercoat layer was formed. After one day, use Tempplex (Asahi Glass Coat and Resin Co., Ltd. Coating Type Ceramic Thermal Insulation Paint for Metal Base) within 2 hours.
Coating was performed twice to form a thermal barrier coating having a final thickness of 380 μm.

Next, 100 parts (parts by weight of solid content, hereinafter the same) of a fluorine-containing resin emulsion (Zeffle SE-310 manufactured by Daikin Industries, Ltd.) were added to the roof on which the thermal barrier coating was formed, (Texanol C manufactured by Chisso Corporation)
S-12) 15 parts, colloidal silica (Nissan Chemical Co., Ltd.)
40 parts of Snowtex CM40 manufactured by Nippon Unicar Co., Ltd.)
1230) 4 parts and 2.3 parts of an epoxy-based silane coupling agent (AZ-6173 manufactured by Nippon Unicar Co., Ltd.) were prepared.
Coating was performed so as to be 0 to 40 μm. For comparison, the same thermal barrier coating was applied to the roof of the same type of storeroom, and the same preparation was performed except that colloidal silica, polyether-modified silane coupling agent and epoxy silane coupling agent were not blended. An outermost layer paint for comparison was applied with a roller so that the dry film thickness became 30 to 40 μm, and was used as a comparative storage.

These storages were placed outdoors in Settsu City, Osaka Prefecture for 6 months from February to August, and the heat shielding part of the roof was exposed, and the color difference (ΔL *) value after 6 months of exposure was determined. However, the storage of the present invention was 3.1, whereas the storage for comparison was 11.2, which was inferior in stain resistance. In addition, when the temperature near the tabletop inside the storage room was measured in the afternoon, when it was exposed to direct sunlight in the summer (early August), the storage room for comparison reached a maximum of 44.2 ° C. In the storeroom of the invention, the maximum temperature was 32.5 ° C. and 11.7 ° C., which was lower.

Examples 3 to 8 and Comparative Examples 2 to 4 The heat-shielding paint (tempplex) used in Example 2 was applied to an aluminum plate having a thickness of 1 mm so as to have a dry film thickness of 100 μm. The outermost layer paint shown in Table 1 was applied thereon with an air spray gun so as to have a dry film thickness of 40 μm, and dried at room temperature for 1 week to produce a heat-shielding coated plate. The following test was performed on this heat shield coated plate. Table 1 shows the results.

Stain resistance test: The stain resistance test was carried out by exposing the heat-shielding coated plate to the south side at an inclination of 30 ° in Settsu-shi, Osaka for 6 months and measuring with a colorimeter of the coating film (manufactured by Nippon Denshoku Co., Ltd.). Color difference (Δ
L *).

Weather resistance test: The thermal barrier coating plate was accelerated in a weather resistance tester (Sunshine Weatherometer (SWOM), manufactured by Suga Test Instruments Co., Ltd.). Co., Ltd.) and evaluated by gloss retention.

[0070]

[Table 1]

As is clear from Table 1, when the coating structure of the present invention is used, the stain resistance (ΔL * value) is greatly improved despite no difference in weather resistance.

[0072]

According to the present invention, it is possible to provide a thermal barrier coating structure having an outermost layer (top coat) which is excellent in antifouling property and can maintain the effect of thermal barrier coating for a long period of time.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C09D 133/00 C09D 133/00 (72) Inventor Susumu Wada 1-1-1 Nishiichitsuya, Settsu-shi, Osaka Daikin Industries Inside Yodogawa Works (72) Inventor Hiroo Mitsuhata 1-1, Nishiichitsuya, Settsu-shi, Osaka Daikin Industries, Ltd. Yodogawa Works F-term (reference) 4D075 EA43 EB16 EB22 EB38 EB42 EC03 EC35 EC37 4F100 AA20B AE01 AK01B AK12 AK16B AK17B AK25B AK51B AK52B AK79B AL05B AN02 AT00 BA02 CA02B CA02H CA18B CA18H CA30B CA30H CC00A CC00B DJ01 GB07 JB09B JJ02A JL06 JN01B 4J038 CD091 CG141 CL001 DG191 DL032 HA446 J0432 NA446

Claims (5)

[Claims] 1. A thermal barrier coating structure comprising a thermal barrier coating layer and a transparent outermost layer, wherein the transparent outermost layer is a coating layer containing a transparent resin component and a hydrophilizing agent. 2. The coating structure according to claim 1, wherein the transparent outermost layer further contains a curing agent, a curing catalyst and / or a hydrolysis catalyst. 3. The transparent resin component of the transparent outermost layer is an acrylic urethane resin, an acrylic resin, an acrylic silicone resin, a fluorinated urethane resin, a fluororesin, an inorganic resin for paint, or two or more of these. Or the coating structure of 2. 4. The coating structure according to claim 3, wherein the transparent outermost transparent resin component is a solvent-soluble vinylidene resin. 5. The method according to claim 1, wherein the hydrophilizing agent is colloidal silica, polysiloxane, a water-soluble organic polymer, a surfactant, a silane coupling agent, or two or more thereof.
The coating structure according to any one of Items 1 to 4,