JP4833587B2 - Thermal barrier coating composition and construction having the coating film - Google Patents

Description

  The present invention relates to a thermal barrier coating composition that has a high thermal barrier property and prevents thermal energy from entering by efficiently reflecting thermal energy such as sunlight, and a structure having the coating film.

An increase in indoor temperature due to the thermal energy of sunlight causes a decrease in human sensitivity and discomfort, leading to a decrease in efficiency, and the occurrence of mistakes and accidents. As a method for preventing this, white paint has been conventionally applied to the roof, outer wall, and the like of buildings because of the heat-shielding effect by color. For example, the use of a white pigment in the paint suppresses the temperature rise of the roof and the outer wall, but it does not reach the heat shielding performance (see, for example, Patent Document 1). On the other hand, as a method for imparting a temperature rise and low thermal conductivity of the coating film, there is a technique in which a hollow sphere and a white pigment are used in the coating film (see, for example, Patent Document 2 and Patent Document 3). Since the body itself does not have a heat shielding effect, the heat shielding effect is reduced when exposed to the coating surface. Further, in this case, there are problems that the coating film tends to be thick, the painting work becomes complicated, and the coating film is likely to deteriorate over time. As described above, each research and development has been conducted from the viewpoint of the heat shielding effect due to the color of the paint and the reduction of the thermal conductivity of the paint film. Not.
Japanese Patent Laid-Open No. 2-185572 JP 2004-10903 A JP 2001-220502 A

  An object of the present invention is to provide a thermal barrier coating composition that has a high thermal barrier property and prevents thermal energy from entering by efficiently reflecting thermal energy such as sunlight, and a structure having the coating film. With the goal.

  As a result of intensive studies in view of such problems, the present inventors have used a combination of a large particle size titanium dioxide powder and a silica powder or a silicate powder in a paint, and a large particle size titanium dioxide using a silica powder or a silicate powder. It has been found that heat shielding performance can be obtained by floating the surface of the coating film on the surface of the coating film, and the present invention has been completed.

The present invention relates to the following.
(1) A thermal barrier coating composition comprising (A) a binder, (B) a large particle size titanium dioxide powder having a particle size of 0.5 to 5.0 μm, and (C) a silica powder or a silicate powder. .
(2) The thermal barrier coating composition according to (1), which contains 0.1 to 15.0% by weight of titanium dioxide powder having a large particle size.

(3) Silica powder or silicate powder is contained in an amount of 0.1 to 15.0% by weight, and the silica powder or silicate powder is mainly composed of silicate powder having a particle diameter of 5.0 to 30.0 μm. The thermal barrier coating composition according to (1) or (2).
(4) The thermal barrier coating composition according to any one of (1) to (3), wherein the silicate powder is aluminum sodium silicate powder, alumina silicate powder, or clay powder.
(5) A structure having on its surface a coating film formed using the thermal barrier coating composition according to any one of (1) to (4).

  The coating film formed by applying the thermal barrier coating composition containing the large-diameter titanium dioxide of the present invention and silica powder or silicate powder has increased the coating surface temperature due to solar energy, which has been a problem in the past. The thermal insulation performance to suppress can be obtained. Furthermore, since this coating film is excellent in accelerated weather resistance, a coating film that does not deteriorate over a long period of time can be formed on the surface of the structure.

In order to solve the above-mentioned problems, in the present invention, a thermal barrier coating composition and a structure in which a coating film is formed are obtained by the following means.
The large particle size titanium dioxide powder of the component (B) used in the present invention has a particle size of 0.5 to 5.0 μm, preferably 0.7 to 3.0 μm, more preferably 0.9 to 2.0 μm. Here, if the particle diameter of the large-diameter titanium dioxide powder is less than 0.5 μm, sufficient heat shielding performance cannot be obtained, and if it exceeds 5.0 μm, the dispersibility tends to decrease. The content of the large particle size titanium dioxide powder is preferably 0.1 to 15.0% by weight, more preferably 1.0 to 10.0% by weight, based on the thermal barrier coating composition. It is more preferable that the content is 2.0 to 6.0% by weight. Here, if the content of the large particle size titanium dioxide powder is less than 0.1% by weight, there is no heat-shielding effect. Tends to decrease.

  Among the silica powder or silicate powder of the component (C) used in the present invention, various kinds of silicate powder can be mentioned, for example, aluminum sodium silicate powder, alumina silicate powder, clay powder, etc. Sodium silicate powder is preferred. Silica powder and silicate powder are mainly composed of silica powder or silicate powder having a particle size of 5.0 to 30.0 μm, preferably 7.0 to 25.0 μm, more preferably 10.0 to 20.0 μm. It is preferable that Here, the main component means a component constituting at least 80.0% by weight, preferably 100% by weight, of the total amount of each of the silica powder and silicate powder used. The average particle size of the silica powder and silicate powder is preferably 10.0 to 20.0 μm, more preferably 12.0 to 18.0 μm, and 13.0 to 17.0 μm. Is more preferable. The content of the silica powder and the silicate powder (the content when only one is used, or the total content when both are used together) is 0.00 with respect to the thermal barrier coating composition. The content is preferably 1 to 15.0% by weight, more preferably 1.0 to 10.0% by weight, and even more preferably 2.0 to 6.0% by weight. Here, if the content of silica powder and silicate powder is less than 0.1% by weight, the floating effect of large-diameter titanium dioxide powder tends to be insufficient, and if it exceeds 15.0% by weight, the viscosity of the paint, There exists a tendency for adhesive force, crack resistance, etc. to fall.

  Examples of the binder used in the present invention include emulsion resins such as synthetic resins and aqueous emulsion resins. Synthetic resins include alkyd resins, amino alkyd resins, acrylic resins, phenol resins, urea resins, melamine resins, epoxy resins, polyurethane, polyvinyl chloride, polyvinyl acetate, and the like, and among them, acrylic resins are preferable. Examples of the water-based emulsion resin include silicon acrylic emulsion, acrylic emulsion, urethane emulsion, urethane acrylic emulsion and the like, and among them, silicon acrylic emulsion is preferable. Furthermore, the synthetic resin preferably has good mechanical stability and a glass transition temperature (hereinafter abbreviated as Tg) of 0 to 70 ° C. Below 0 ° C., the adhesion is good, but the coating film is too flexible and the wear resistance, stain resistance, drying property, and coating film strength are poor. When the temperature exceeds 70 ° C., excessive film-forming aids are added, the viscosity of the paint is remarkably increased, cracks are caused by a decrease in the flexibility of the coating film, and the water resistance of the coating film tends to decrease. Therefore, the Tg of the synthetic resin is more preferably 10 to 30 ° C. The average molecular weight of the synthetic resin (weight average molecular weight in terms of standard polystyrene by gel permeation chromatography) is preferably 100,000 to 200,000. If a polymer having an average molecular weight of less than 100,000 is used, the coating film strength is too weak, and the coating film may be peeled off such that the coating film is torn off or the stain resistance tends to be poor. On the other hand, if it exceeds 200,000, there is no problem in coating strength and stain resistance, but the viscosity tends to increase. More preferably, about 150,000 is good. In the case of an aqueous emulsion resin, the solid content concentration (hereinafter abbreviated as NV) is preferably 43 to 62% by weight. If it is less than 43% by weight, the NV in the paint tends to be low and the drying property tends to be inferior. If it exceeds 62% by weight, the viscosity of the paint tends to increase or the crack resistance tends to decrease. The amount of the binder such as a synthetic resin or water-based emulsion resin is preferably 10.0 to 70.0% by weight, more preferably 20.0 to 60.0% by weight, more preferably 30.0% with respect to the thermal barrier coating composition. More preferred is ˜50.0% by weight. If the amount is less than 10.0% by weight, the workability tends to increase due to an increase in the viscosity of the paint, whereas if it exceeds 70.0% by weight, the drying property and the contamination property tend to be inferior.

  The thermal barrier coating composition used in the present invention is generally produced by filling or kneading other components together with the above components. Examples of such components include a film forming aid, a plasticizer, a pigment, a silane coupling agent, a dispersant, and an antifoaming agent.

  As film-forming aids, butyl carbitol acetate, butyl carbitol, butyl cellosolve, butyl cellosolve acetate, benzyl acetate, 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, 2,2,4-trimethyl -1,3-pentanediol diisobutyrate, 2,2,4-trimethyl-1,3-pentanediol 2-ethylhexanoate isobutyrate, 2,2,4-trimethyl-1,3-pentanediol di-2- The content of ethyl hexanoate, 2-ethylhexyl glycol, propylene glycol monobutyl ether and the film-forming aid is preferably 0.1 to 20.0% by weight based on the thermal barrier coating composition. It is more preferable to contain 5 to 10.0% by weight, and 1.0 to 5.0 weight % And even more preferably it contains. Here, if the content of the film-forming auxiliary is less than 0.1% by weight, there is a tendency that film formation at the time of coating cannot be obtained. If it exceeds 20% by weight, film formation is good but coating film drying deteriorates. Tend.

  Examples of the plasticizer include phthalic acid esters such as dioctyl phthalate (DOP), phosphoric acid esters such as triethyl phosphate (TEP) and tributyl phosphate (TBP), phenyl glycidyl ether (PGE), benzyl alcohol, acetyl citrate plasticizer, An epoxy plasticizer, a trimet plasticizer, etc. are mentioned. The blending amount of the plasticizer is preferably 0.5 to 5.0% by weight, more preferably 1.0 to 4.0% by weight, and 1.5 to 2.5% by weight based on the thermal barrier coating composition. Further preferred. If it is less than 0.5% by weight, the flexibility at a low temperature tends to be inferior, whereas if it exceeds 5.0% by weight, the drying property and the contamination tend to be inferior.

  Examples of the pigment include those other than the above-mentioned large particle size titanium dioxide powder, silica powder, and silicate powder. For example, white pigments include titanium dioxide, zinc white, lithopone, lead having a particle size of 0.1 to 0.3 μm. Examples of coloring pigments include chrome yellow, titanium yellow, chromium oxide, iron oxide, ultramarine blue, bitumen, anthraquinone, quinacridone, perylene, isoindolinone, azo, and phthalocyanine pigments. Moreover, you may use together a phosphorescent pigment, a fluorescent pigment, a luminescent pigment, etc. individually as needed. The blending amount of the pigment is preferably 5.0 to 80.0% by weight, more preferably 10.0 to 70.0% by weight, and more preferably 20.0 to 60.0% by weight with respect to the thermal barrier coating composition. Further preferred. If it is less than 10.0% by weight, the non-volatile content of the coating tends to be low, resulting in a decrease in drying property and hiding power. On the other hand, when it exceeds 70.0% by weight, it becomes difficult to disperse, and the paintability tends to decrease due to the increase in the viscosity of the paint and the deterioration of the fluidity.

  Examples of the silane coupling agent include various silane coupling agents such as vinyl group, epoxy group, styryl group, methacryloxy group, acryloxy group, amino group, ureido group, chloropropyl group, mercapto group, isocyanate group, and sulfide group. Although the thing with a functional group is mentioned, an epoxy group is preferable. The content of the silane coupling agent is preferably 0.01 to 5.0% by weight, and preferably 0.02 to 4.0% by weight, based on the thermal barrier coating composition. More preferably, it is more preferably 0.03-3.0% by weight. Here, if the content of the silane coupling agent is less than 0.01% by weight, the effect of improving the coating film strength and water resistance tends to be insufficient, and if it exceeds 4.0% by weight, the paint balance is lost. There is a tendency for adhesive strength, viscosity, crack resistance, etc. to decrease and to increase in viscosity over time.

  Examples of dispersants include polycarboxylic acid alkylamine salts, alkylammonium salts, alkylroll aminoamides, polycarboxylic acid polyaminoamides, acrylic copolymer ammonium salts, polycarboxylic acid sodium salts, polycarboxylic acid ammonium salts, polycarboxylic acid salts. Examples thereof include carboxylic acid amino alcohol salts, polyaminoamide carboxylates, and polyaminoamide polar acid ester salts.

  Antifoaming agent includes modified silicone antifoaming agent, special silicone antifoaming agent, silicone antifoaming agent, silica antifoaming agent, silica silicone antifoaming agent, hydrophobic silica, hydrophobic silicone, wax, special Examples thereof include wax and polysiloxane.

  The blending amount of the dispersant and the antifoaming agent is preferably 0.1 to 5.0% by weight, more preferably 0.3 to 4.0% by weight, more preferably 0.5 to 3.0% by weight is more preferable. If it is less than 0.1% by weight, the dispersion and antifoaming properties of the paint tend to be low. On the other hand, if it exceeds 5.0% by weight, dispersibility and defoaming properties are good, but repellency and cocoon skin phenomenon tend to occur on the surface of the coating film during coating.

  When a paint is produced using the heat resistant paint composition of the present invention, the production method of the paint is not particularly limited, but first, it is necessary to disperse the pigment in the binder. As this method, usually, a binder and a pigment are mixed with water or an organic solvent, and this mixture is dispersed and kneaded using various dispersing and kneading apparatuses such as a three roll, ball mill, sand mill, bead mill, kneader and the like. be able to. In the case where the binder is an emulsion resin, water or an organic solvent is not always necessary, and can be appropriately used as necessary.

  Further, it is preferable to use the above-mentioned dispersant at the time of dispersing the pigment because the dispersibility and dispersion stability of the pigment are improved. The dispersant is preferably used in an amount of 50 parts by weight or less with respect to 100 parts by weight of the pigment when the pigment is dispersed. The large particle diameter titanium dioxide, silica powder or silicate powder, and other components may be added at the time of pigment dispersion or after dispersion. Similarly, water or an organic solvent may be used in the total amount when the pigment is dispersed, or a part thereof may be added after the dispersion. However, the aqueous organic solvent is preferably used in an amount of at least 50 parts by weight at the time of dispersion with respect to 100 parts by weight of the total amount of binder and pigment at the time of dispersion. If it is less than 50 parts by weight, the viscosity at the time of dispersion is too high, and it may be difficult to disperse particularly when dispersed by a ball mill, sand mill, bead mill or the like.

  There is no restriction | limiting in particular as water or the organic solvent used at the time of dispersion | distribution, As an organic solvent, a ketone type, alcohol type, an aromatic type etc. are mentioned, for example. Specific examples include acetone, methyl ethyl ketone, cyclohexane, ethylene glycol, propylene glycol, methyl alcohol, ethyl alcohol, isopropyl alcohol, n-butyl alcohol, benzene, toluene, xylene, ethyl lactate, and ethyl acetate. These may be used alone or in combination of two or more.

  However, the selection of water or an organic solvent is appropriately determined in combination with other materials such as pigments and dispersants. In some cases, when a certain organic solvent is used, the heat shielding performance that is a feature of the present invention. Obviously, the organic solvent cannot be used in the system. Therefore, although there is no restriction | limiting in the organic solvent to be used, You must select the organic solvent suitable for the type | system | group.

  Next, brush coating, spray coating, and roll coater coating are preferable as the coating method of the thermal barrier paint thus obtained, but electrostatic coating, curtain coating, dipping method, etc. can be applied depending on the object to be coated. It is. Further, after coating, the method of drying to form a coating film may be a method such as natural drying or baking, which is appropriately selected depending on the paint properties and the like.

  100-400 micrometers is preferable and, as for the film thickness in the coating of the thermal-insulation coating composition of this invention, 200-300 micrometers is more preferable. If the thickness is less than 100 μm, the film thickness is thin, so that the concealability is inferior and the heat shielding property tends to be lowered. When it exceeds 400 μm, the concealability and heat shielding properties are good, but the followability to the base material tends to be lowered.

The thermal barrier coating composition of the present invention is applied to an aluminum plate, a galvanized steel plate, an aluminum galvanized steel plate, an iron plate, a tin plate, a slate plate, concrete, or the like that forms a structure such as a building or a base material that has been subjected to any treatment. It is preferable to apply after applying a ground treatment such as a primer. For example, there is a method of applying a thermal barrier coating composition after coating an epoxy-based primer with a thickness of 10 to 100 μm.
By the above-described method, the thermal barrier coating composition of the present invention and the structure formed by coating them are obtained.

  EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, this invention is not restrict | limited to an Example at all. In Examples, “%” means “% by weight” and “parts” means “parts by weight” unless otherwise specified.

プライマルＡＣ６３１０： 固形分４８％
ディスパービック１８１： アルキルアンモニウム塩
ＢＹＫ−０１９： 変性シリコーン系消泡剤
ＤＯＰ： ジ−２−エチルヘエキシルフタレート
ＴＩＧ Ｒ−９００： 二酸化チタン（粒子径：０．１５〜０．２５μｍ、平均粒径：０．２μｍ）
テキサノール： ２，２，４−トリメチル−１，３−ペンタンジオールモノイソブチレート
ＫＢＭ−４０３： ３−グリシドキシプロピルトリメトキシシラン
Sipernat 820A： アルミニウムナトリウムシリケート、平均粒径：１５μｍ、粒子径が５．００〜３０．０μｍの範囲内にある主成分の重量％：８０％以上） [Example 1]

Primal AC6310: 48% solids
Dispersic 181: Alkylammonium salt BYK-019: Modified silicone antifoaming agent DOP: Di-2-ethylhexyl phthalate TIG R-900: Titanium dioxide (particle size: 0.15-0.25 μm, average particle size: 0.2μm)
Texanol: 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate KBM-403: 3-glycidoxypropyltrimethoxysilane
Sipernat 820A: Aluminum sodium silicate, average particle size: 15 μm, weight percentage of main component in the range of 5.00-30.0 μm: 80% or more)

  Components A to I shown in Table 1 were mixed with a dissolver and then applied to an iron plate.

プライマルＡＣ２５０８： 固形分４６．５％
ディスパービック１８３： 顔料に親和性のある官能基を含むブロック共重合物
ＢＹＫ−０１８： シリコーン系消泡剤
ＤＯＰ： ジ−２−エチルヘエキシルフタレート
ＴＩＧ Ｒ−９００： 二酸化チタン（粒子径：０．１５〜０．２５μｍ、平均粒径：０．２μｍ）
ＣＳ１２： ２，２，４−トリメチル−１，３−ペンタンジオールモノイソブチレート
ＫＢＭ−１００３： ビニルトリメトキシシラン
Sipernat 820A： アルミニウムナトリウムシリケート、平均粒径：１５μｍ、粒子径が５．００〜３０．０μｍの範囲内にある主成分の重量％：８０％以上） [Example 2]

Primal AC2508: Solid content 46.5%
Dispersic 183: Block copolymer containing functional group having affinity for pigment BYK-018: Silicone antifoaming agent DOP: Di-2-ethylhexyl phthalate TIG R-900: Titanium dioxide (particle size: 0. (15-0.25 μm, average particle size: 0.2 μm)
CS12: 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate KBM-1003: vinyltrimethoxysilane
Sipernat 820A: Aluminum sodium silicate, average particle size: 15 μm, weight percentage of main component in the range of 5.00-30.0 μm: 80% or more)

  Components A to I shown in Table 2 were mixed with a dissolver and then applied to an iron plate.

プライマルＡＣ２６１５： 固形分５０％
ディスパービック１８４： 顔料に親和性のある官能基を含むブロック共重合物
ＢＹＫ−０２１： シリカシリコーン系消泡剤
ＤＯＰ： ジ−２−エチルヘエキシルフタレート
ＴＩＧ Ｒ−９００： 二酸化チタン（粒子径：０．１５〜０．２５μｍ、平均粒径：０．２μｍ）
ＣＳ１６： ２，２，４−トリメチル−１，３−ペンタンジオールジイソブチレート
ＫＢＭ−５０３： ３−メタクリロキシプロピルトリメトキシシラン
Sipernat 820A： アルミニウムナトリウムシリケート、平均粒径：１５μｍ、粒子径が５．００〜３０．０μｍの範囲内にある主成分の重量％：８０％以上） [Example 3]

Primal AC2615: 50% solids
Dispersic 184: Block copolymer containing functional group having affinity for pigment BYK-021: Silica silicone antifoaming agent DOP: Di-2-ethylhexyl phthalate TIG R-900: Titanium dioxide (particle size: 0 .15-0.25 μm, average particle size: 0.2 μm)
CS16: 2,2,4-trimethyl-1,3-pentanediol diisobutyrate KBM-503: 3-methacryloxypropyltrimethoxysilane
Sipernat 820A: Aluminum sodium silicate, average particle size: 15 μm, weight percentage of main component in the range of 5.00-30.0 μm: 80% or more)

  Components A to I shown in Table 3 were mixed with a dissolver and then applied to an iron plate.

プライマルＪＰ−１１８ＦＦ： 固形分５０％
ディスパービック１９０： 顔料に親和性のある官能基を含むブロック共重合物
ＢＹＫ−０２４： 疎水性シリコーン系消泡剤
ＤＯＰ： ジ−２−エチルヘエキシルフタレート
ＴＩＧ Ｒ−９００： 二酸化チタン（粒子径：０．１５〜０．２５μｍ、平均粒径：０．２μｍ）
ＣＳ２０： ２，２，４−トリメチル−１，３−ペンタンジオール ２−エチルヘキサノエート イソブチレート
ＫＢＭ−６０３： アミノエチル３−アミノプロピルトリメトキシシラン
Sipernat 820A： アルミニウムナトリウムシリケート、平均粒径：１５μｍ、粒子径が５．００〜３０．０μｍの範囲内にある主成分の重量％：８０％以上） [Example 4]

Primal JP-118FF: 50% solid content
Dispersic 190: Block copolymer containing functional group having affinity for pigment BYK-024: Hydrophobic silicone-based antifoaming agent DOP: Di-2-ethylhexyl phthalate TIG R-900: Titanium dioxide (particle size: (0.15-0.25 μm, average particle size: 0.2 μm)
CS20: 2,2,4-trimethyl-1,3-pentanediol 2-ethylhexanoate isobutyrate KBM-603: aminoethyl 3-aminopropyltrimethoxysilane
Sipernat 820A: Aluminum sodium silicate, average particle size: 15 μm, weight percentage of main component in the range of 5.00-30.0 μm: 80% or more)

  The components A to I shown in Table 4 were mixed with a dissolver and then applied to an iron plate.

プライマルＡＣ２２３５： 固形分４６．５％
ディスパービック１９１： 顔料に親和性のある官能基を含む共重合物
ＢＹＫ−０２８： ポリシロキサン
ＤＯＰ： ジ−２−エチルヘエキシルフタレート
ＴＩＧ Ｒ−９００： 二酸化チタン（粒子径：０．１５〜０．２５μｍ、平均粒径：０．２μｍ）
ＣＳ２４： ２，２，４−トリメチル−１，３−ペンタンジオール ジ−２−エチルヘキサノエート
ＫＢＭ−９０３： ３−アミノプロピルトリメトキシシラン
Sipernat 820A： アルミニウムナトリウムシリケート、平均粒径：１５μｍ、粒子径が５．００〜３０．０μｍの範囲内にある主成分の重量％：８０％以上） [Example 5]

Primal AC2235: Solid content 46.5%
Dispersic 191: Copolymer containing functional group having affinity for pigment BYK-028: Polysiloxane DOP: Di-2-ethylhexyl phthalate TIG R-900: Titanium dioxide (particle size: 0.15 to 0. (25 μm, average particle size: 0.2 μm)
CS24: 2,2,4-trimethyl-1,3-pentanediol di-2-ethylhexanoate KBM-903: 3-aminopropyltrimethoxysilane
Sipernat 820A: Aluminum sodium silicate, average particle size: 15 μm, weight percentage of main component in the range of 5.00-30.0 μm: 80% or more)

  Components A to I shown in Table 5 were mixed with a dissolver and then applied to an iron plate.

プライマルＡＣ６３１０： 固形分４８％
ディスパービック１８１： アルキルアンモニウム塩
ＢＹＫ−０１９： 変性シリコーン系消泡剤
ＤＯＰ： ジ−２−エチルヘエキシルフタレート
ＴＩＧ Ｒ−９００： 二酸化チタン（粒子径：０．１５〜０．２５μｍ、平均粒径：０．２μｍ）
テキサノール： ２，２，４−トリメチル−１，３−ペンタンジオールモノイソブチレート
ＫＢＭ−４０３： ３−グリシドキシプロピルトリメトキシシラン [Comparative Example 1]
Except for removing the silicate powder from Example 1, when using the same ingredients as in Example 1 in almost the same amount

Primal AC6310: 48% solids
Dispersic 181: Alkylammonium salt BYK-019: Modified silicone antifoaming agent DOP: Di-2-ethylhexyl phthalate TIG R-900: Titanium dioxide (particle size: 0.15-0.25 μm, average particle size: 0.2μm)
Texanol: 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate KBM-403: 3-glycidoxypropyltrimethoxysilane

  The components A to H shown in Table 6 were mixed with a dissolver and then applied to an iron plate.

プライマルＡＣ６３１０： 固形分４８％
ディスパービック１８１： アルキルアンモニウム塩
ＢＹＫ−０１９： 変性シリコーン系消泡剤
ＤＯＰ： ジ−２−エチルヘエキシルフタレート
ＴＩＧ Ｒ−９００： 二酸化チタン（粒子径：０．１５〜０．２５μｍ、平均粒径：０．２μｍ）
テキサノール： ２，２，４−トリメチル−１，３−ペンタンジオールモノイソブチレート
ＫＢＭ−４０３： ３−グリシドキシプロピルトリメトキシシラン
Sipernat 820A： アルミニウムナトリウムシリケート、平均粒径：１５μｍ、粒子径が５．００〜３０．０μｍの範囲内にある主成分の重量％：８０％以上） [Comparative Example 2]
When the same components as in Example 1 were used in substantially the same amount except that the large-diameter titanium dioxide powder was removed from Example 1.

Primal AC6310: 48% solids
Dispersic 181: Alkylammonium salt BYK-019: Modified silicone antifoaming agent DOP: Di-2-ethylhexyl phthalate TIG R-900: Titanium dioxide (particle size: 0.15-0.25 μm, average particle size: 0.2μm)
Texanol: 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate KBM-403: 3-glycidoxypropyltrimethoxysilane
Sipernat 820A: Aluminum sodium silicate, average particle size: 15 μm, weight percentage of main component in the range of 5.00-30.0 μm: 80% or more)

  The components A to G shown in Table 7 were mixed with a dissolver and then applied to an iron plate and a glass plate.

[Comparative Example 3]
Unpainted iron plate

[Preparation of thermal insulation test plate]
It coated so that the coating-film thickness after drying might be set to 200 +/- 20micrometer using the film applicator whose clearance gap is 400 micrometers on the iron plate of thickness 0.8mm.
[Thermal insulation test]
The test plate produced by the above method was dried at room temperature for 3 days, and then irradiated with a 250 W infrared light bulb (manufactured by Toshiba Lighting & Technology Co., Ltd., model number IR110V250WRH) from a distance of 20 cm to test the increase in coating film surface temperature.
[Accelerated weather resistance test]
After the test plate produced by the above method is dried at room temperature for 3 days, the test room temperature is 63 ± 3 ° C., the amount of water is 2100 ± 100 ml / min using (model number WEL-SUN-HCH-BEN type manufactured by Suga Test Co., Ltd.). The accelerated weathering test was performed under the conditions of a discharge voltage of 50 ± 2 V and a discharge current of 60 ± 2 A for 18 minutes during irradiation for 120 minutes.

[Heat shielding test of coating film]

  From Table 8, in the case of the system (Comparative Examples 1 and 2) in which the large particle size titanium dioxide powder and the silicate powder are used individually, the coating surface temperature is remarkably increased from the result of the heat shielding test. I understand. Moreover, the surface temperature of the iron plate that has nothing painted on the surface (Comparative Example 3) is the highest. On the other hand, the system (Examples 1-5) which used the large particle size titanium dioxide powder and the silicate powder together did not have a significant increase in the coating film surface temperature in the heat shielding test. Thus, it was confirmed that the heat-shielding paint using the large-diameter titanium dioxide and silica powder or silicate powder in combination is excellent in heat-shielding performance.

Claims (2)

(A) a binder, (B) a large grain titanium dioxide powder particle size 0.5 to 5.0 .mu.m 0.1 to 15.0% by weight and (C) A Rumi um sodium silicate powder 0.1 to 15 A thermal barrier coating composition characterized by containing 0.0 % by weight and containing aluminum sodium silicate powder having a particle diameter of 5.0 to 30.0 μm as a main component . A construction having on its surface a coating film formed using the thermal barrier coating composition according to claim 1 .