JP2008038049A - Luster coating agent for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a luster coating agent for vehicle, which surely fills and hides a flaw, maintains luster for a long period of time and has excellent storage stability. <P>SOLUTION: The luster coating agent for vehicle is prepared by mixing a moisture-curable silicone oligomer having a refractive index of ≥1.400 with a curing catalyst and, if necessary, a diluent. When the luster coating agent for vehicle is applied to the metal surface, the coated surface or the resin surface of a vehicle, a flaw is surely filled and hidden and the luster coating agent for vehicle continuously exhibits polishing performance and maintains the luster for a long period of time. The luster coating agent for vehicle has excellent storage stability and realizes stable preservation. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a glazing coating agent for vehicles, and more specifically, forms a cured coating film by applying to a metal surface such as a vehicle wheel, a painted surface such as a vehicle body, a resin surface such as a vehicle bumper, The present invention relates to a glazing coating agent for vehicles that imparts gloss to metal surfaces, painted surfaces, and resin surfaces.

  2. Description of the Related Art Conventionally, it is often practiced to apply a surface protective agent or the like to a painted surface of a vehicle such as an automobile so as to give gloss and gloss and to protect the surface.

For example, (1) 0.1-10.0 parts by weight of moisture curable organopolysiloxane, (2) organotin compound or metal chelate as a film formation regulator, or the like 0.0005 to 1.0 parts by weight of a mixture of (3) 75.0 to 99.0 parts by weight of volatile dimethylpolysiloxane having a boiling point of 100 to 250 ° C. as a carrier (4) 0.1 to 20.0 organopolysiloxane oil A deteriorated coating film for automobiles containing a part by weight and a small wound repairing and polishing agent have been proposed (for example, see Patent Document 1).
JP-A-10-36771

  However, in the deteriorated coating film for automobiles and the small wound repairing and polishing agent described in Patent Document 1, the volatile dimethylpolysiloxane and the organopolysiloxane oil disappear with time, so that the polishing performance is lowered. Therefore, although a good gloss can be obtained immediately after application, there is a problem that the gloss state is lowered after a long period of time. In addition, when the medicine is stored for a long period of time, there is a problem that it lacks storage stability, such as solidification.

  Furthermore, the deteriorated coating film for automobiles and the small wound repairing and polishing agent described in Patent Document 1 have a problem that the coating film repairing effect and the repairing effect on the small wound part are not yet sufficient.

  An object of the present invention is to provide a vehicular glazing coating agent that can reliably fill a flaw, hide a flaw steadily, maintain gloss over a long period of time, and has excellent storage stability. There is.

  In order to achieve the above object, the veneer coating agent for vehicles of the present invention is characterized by containing a moisture curable silicone oligomer having a refractive index of 1.400 or more and a curing catalyst.

  Moreover, in the glazing coating agent for vehicles of the present invention, it is preferable that the moisture-curable silicone oligomer is an alkoxysilane compound represented by the following general formula (1) or a partially hydrolyzed condensate thereof.

R ¹ _n Si (OR ² ) _4-n (1)
(In General Formula (1), R ¹ represents a hydrogen atom or a substituted or unsubstituted monovalent hydrocarbon group, R ² represents an alkyl group, and n represents an integer of 0 to 3. ¹ and R ² may be the same or different from each other.
In the vehicular glazing coating agent of the present invention, it is preferable that the surface hardness of the cured coating film of the coating agent is 5H or less in terms of pencil hardness.

In the vehicular glazing coating agent of the present invention, it is preferable that R ¹ in the general formula (1) contains at least a monovalent hydrocarbon group having 4 or more carbon atoms.

  Moreover, it is preferable that the glazing coating agent for vehicles of the present invention further contains a diluent.

  In the vehicle polish coating agent of the present invention, it is preferable that the diluent is at least one selected from the group consisting of hydrocarbon solvents, ester solvents, glycol ether solvents, and ketone solvents. is there.

  In the vehicle polish coating agent of the present invention, it is preferable that the hydrocarbon solvent is a paraffin solvent.

  According to the glazing coating agent for a vehicle of the present invention, it is possible to reliably fill a flaw and hide a flaw steadily, and to continuously exhibit the glazing performance and maintain the shine for a long time. In addition, the storage stability is excellent and stable storage can be realized.

  The vehicle polish coating agent of the present invention contains a moisture curable silicone oligomer and a curing catalyst.

  In the present invention, the moisture curable silicone oligomer is, for example, a low molecular weight silicone alkoxy oligomer having an alkoxysilyl group at the molecular end, and is cured at room temperature by crosslinking of the alkoxysilyl group in the presence of a curing catalyst described later. To do.

  Such a moisture-curable silicone oligomer is represented by the following general formula (1), for example.

R ¹ _n Si (OR ² ) _4-n (1)
(In General Formula (1), R ¹ represents a hydrogen atom or a substituted or unsubstituted monovalent hydrocarbon group, R ² represents an alkyl group, and n represents an integer of 0 to 3. ¹ and R ² may be the same or different from each other.
Examples of R ¹ include a hydrogen atom or a substituted or unsubstituted monovalent hydrocarbon group.

In R ¹ , examples of the unsubstituted monovalent hydrocarbon group include an alkyl group, a cycloalkyl group, an aryl group, and an aralkyl group.

  Examples of the alkyl group include methyl, ethyl, propyl, iso-propyl, butyl, iso-butyl, sec-butyl, tert-butyl, pentyl, iso-pentyl, sec-pentyl, hexyl, heptyl, n-octyl, isooctyl. Alkyl groups having 1 to 18 carbon atoms such as 2-ethylhexyl, nonyl, decyl, isodecyl, dodecyl, tetradecyl, hexadecyl, and octadecyl.

  Examples of the cycloalkyl group include cycloalkyl groups having 3 to 8 carbon atoms such as cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, and cyclooctyl.

  Examples of the aryl group include aryl groups having 6 to 14 carbon atoms such as phenyl, tolyl, xylyl, biphenyl, naphthyl, anthryl, and phenanthryl.

  Examples of the aralkyl group include benzyl, 1-phenylethyl, 2-phenylethyl, 1-phenylpropyl, 2-phenylpropyl, 3-phenylpropyl, diphenylmethyl, o, m or p-methylbenzyl, o, m or Examples include aralkyl groups having 7 to 13 carbon atoms such as p-ethylbenzyl.

In R ¹ , examples of the substituted monovalent hydrocarbon group include those obtained by substituting the above-described unsubstituted monovalent hydrocarbon group with a substituent. Examples of such a substituent include a halogen atom. (For example, chlorine, fluorine, bromine and iodine), hydroxyl, cyano, amino, carboxyl and the like. These substituents may be the same or different from each other. For example, 1 to 3 substituents may be substituted.

R ¹ preferably includes at least a monovalent hydrocarbon group having 4 or more carbon atoms, and more specifically, R ¹ is an unsubstituted monovalent hydrocarbon group having ¹ to 3 carbon atoms. A combination of a hydrocarbon group and an unsubstituted monovalent hydrocarbon group having 4 or more carbon atoms, more preferably an alkyl group having 1 to 3 carbon atoms and an aryl group having 6 to 14 carbon atoms. It is a combination.

If R ¹ contains at least a monovalent hydrocarbon group having 4 or more carbon atoms, the refractive index (described later) of the moisture-curable silicone oligomer is maintained at a value extremely higher than 1.400, and the gloss of the vehicle is increased. The glazing performance of the dispensing coating agent can be exhibited more continuously.

R ² includes an alkyl group, preferably an alkyl group having 1 to 4 carbon atoms such as methyl, ethyl, propyl, iso-propyl, butyl, iso-butyl, sec-butyl, tert-butyl and the like. .

R ¹ and R ² are independent of each other and may be the same or different from each other.

  n shows the integer of 0-3, for example, Preferably, 1 or 2 is shown.

  Specific examples of such alkoxysilane compounds include methyltrimethoxysilane, methyltriethoxysilane, methyltriisopropoxysilane, methyltributoxysilane, ethyltrimethoxysilane, propyltrimethoxysilane, and dimethyldimethoxysilane. , Phenyltrimethoxysilane, diphenyldimethoxysilane, phenylmethyldimethoxysilane, tetramethoxysilane, tetraethoxysilane, tetraisopropoxysilane, tetrabutoxysilane, or a mixture thereof.

  A partially hydrolyzed condensate of an alkoxysilane compound means that water is added to the above alkoxysilane compound and heated while stirring in the presence of a catalyst to cause partial hydrolysis and condensation. Is obtained.

  The moisture curable silicone oligomer can also be represented by the following average composition formula (2).

R ¹ _a Si (OR ² ) _b O _{(4-ab) / 2} (2)
(In the average composition formula (2), R ¹ represents hydrogen or a substituted or unsubstituted monovalent hydrocarbon group, R ² represents an alkyl group, and a represents an average value of 0.40 to 1. B represents a value within the range of 70, and b represents a value at which the ratio of OR ² bonded to a silicon atom in the average composition formula (2) is 5% by weight or more, and R ¹ or R ² represents They may be the same or different from each other.)
Incidentally, in the average composition formula (2), as ^{R 1} and ^{R 2,} include the same ones as ^{R 1} and ^{R 2} in the general formula (1) described above.

Further, b in the average composition formula (2) is such that the ratio of OR ² bonded to the silicon atom in the average composition formula (2) is, for example, 5 wt% or more, preferably 10 wt% or more, usually 50 The value is not more than wt%, preferably not more than 40 wt%. If b in the above average composition formula (2) is a value in which the ratio of OR ² bonded to the silicon atom in the average composition formula (2) falls within the above range, the surface hardness increases with the crosslinking density. Sufficient glazing performance can be obtained.

  In the present invention, the moisture curable silicone oligomer has a refractive index at 25 ° C. of, for example, 1.400 or more, preferably 1.420 or more, more preferably 1.450 or more, usually 1.600 or less. . The refractive index is a value measured according to JIS K 0062.

  Since the refractive index of the moisture curable silicone oligomer is in the above-described range, the gloss coating agent for vehicle of the present invention can continuously exhibit the gloss performance and maintain the gloss over a long period of time. .

The moisture-curable silicone oligomer has a kinematic viscosity at 25 ° C. of, for example, 500 mm ² / s or less, preferably 200 mm ² / s or less. When the kinematic viscosity of the moisture-curable silicone oligomer is within the above-described range, the surface hardness is increased together with the crosslinking density, and sufficient polishing performance can be obtained. When the kinematic viscosity of the moisture curable silicone oligomer exceeds the above range, the surface hardness decreases with the crosslinking density, and sufficient glossing performance may not be obtained. There may be difficulties in workability.

  Such moisture curable silicone oligomer is available as a commercial product, for example, KR-500 (refractive index: 1.403), X-40-9225 (refractive index: 1.407), X-40- 9246 (refractive index: 1.407), X-40-9250 (refractive index: 1.407), KR-217 (refractive index: 1.545), KR-9218 (refractive index: 1.529), KR- 213 (refractive index: 1.525), KR-510 (refractive index: 1.509), X-40-9227 (refractive index: 1.460), X-40-9247 (refractive index: 1.508), X-41-1053 (refractive index: 1.414), X-41-1056 (refractive index: 1.442), X-41-1805 (refractive index: 1.418), X-41-1810 (refractive index) : 1.422), X-41-2651 (refractive index 1.405) (or more, all manufactured by Shin-Etsu Chemical Co., Ltd.) and the like can be used.

  These moisture curable silicone oligomers may be used alone or in combination of two or more.

  The blending ratio of the moisture curable silicone oligomer is 0.1 to 95% by weight, preferably 1 to 70% by weight, based on the total amount of the vehicle polish coating agent of the present invention. If the blending ratio of the moisture-curable silicone oligomer is less than the above range with respect to the total amount of the vehicle polish coating agent of the present invention, a uniform coating film (film) cannot be obtained, and the above range. If it exceeds 1, coating film formation is good, but workability may be difficult.

  In the present invention, the curing catalyst is not particularly limited as long as it is a catalyst capable of curing a moisture curable silicone oligomer, but for example, an organic tin compound such as dibutyltin diacetate, dibutyltin dioctylate, dibutyltin dilaurate, for example, aluminum Organoaluminum compounds such as tris (acetylacetone), aluminum tris (acetoacetate ethyl), aluminum diisopropoxy (acetoacetate ethyl), for example, zirconium (acetylacetone), zirconium tris (acetylacetone), zirconium tetrakis (ethylene glycol monomethyl ether), Organics such as zirconium tetrakis (ethylene glycol monoethyl ether) and zirconium tetrakis (ethylene glycol monobutyl ether) Organic metal compounds such as ruthenium compounds such as titanium tetrakis (ethylene glycol monomethyl ether), titanium tetrakis (ethylene glycol monoethyl ether), titanium tetrakis (ethylene glycol monobutyl ether), such as hydrochloric acid, nitric acid, sulfuric acid , Mineral acids such as phosphoric acid, organic acids such as formic acid, acetic acid, oxalic acid, trifluoroacetic acid, for example, inorganic bases such as ammonia, sodium hydroxide, potassium hydroxide, ethylenediamine, alkanolamine, etc. Examples include alkalis such as organic bases, and amino compounds such as amino-modified silicone, aminosilane, silazane, and amines. Among these, Preferably, an organic aluminum compound, an organic titanium compound, and mineral acids are mentioned.

  Moreover, a curing catalyst is available as a commercial item, for example, DX-9740 (organo aluminum compound type), D-20 (organic titanium compound type), X-40-2309A (phosphoric acid type) (above, all Shin-Etsu Chemical Co., Ltd.) is used.

  These curing catalysts may be used alone or in combination of two or more.

  The blending ratio of the curing catalyst is 0.1 to 70% by weight, preferably 1 to 50% by weight, based on the total amount of the moisture curable silicone oligomer in the present invention. If the blending ratio of the curing catalyst is within the above range, the curing reaction can be sufficiently advanced.

  In the present invention, as the moisture curable silicone oligomer, a commercially available moisture curable silicone oligomer containing a curing catalyst in advance may be used. Examples of such commercially available products include X-40-175 (curing catalyst DX-175; containing 5 wt%), X-40-2327 (curing catalyst X-40-2309A; containing 30 wt%), KR- 400 (curing catalyst DX-9740; containing 10% by weight) (above, manufactured by Shin-Etsu Chemical Co., Ltd.) or the like is used. The moisture curable silicone oligomer containing these curing catalysts in advance may be used alone or in combination of two or more.

  Moreover, the glazing coating agent for vehicles of this invention can contain a diluent further.

  The diluent is not particularly limited as long as it can dissolve or disperse the moisture-curable silicone oligomer and the curing catalyst. For example, alcohol-based solvents such as methyl alcohol, ethyl alcohol, isopropyl alcohol, for example, ethyl acetate, acetic acid Ester solvents such as butyl, methoxybutyl acetate, ethyl glycol acetate, amyl acetate, for example, glycol ether solvents such as ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, such as methyl ethyl ketone, methyl isobutyl ketone, Ketone solvents such as diisobutylketone and acetylacetone, such as n-hexane, n-heptane, n-octane, iso Octane, or paraffinic solvents, such as mineral turpentine, cyclopentane, and naphthenic solvents, such as cyclohexane, benzene, toluene, etc. hydrocarbon solvents such as aromatic solvents such as xylene. More preferred are hydrocarbon solvents, ester solvents, glycol ether solvents, and ketone solvents. The hydrocarbon solvent is preferably a paraffin solvent. These diluents may be used alone or in combination of two or more.

  Further, the blending ratio of the diluent may be the remaining weight% in which each component is blended with respect to the total amount of the vehicle polish coating agent of the present invention, for example, 5 to 95 weight%, preferably 20 to 20 weight%. 90% by weight. When the blending ratio of the diluent is within the above range, the polishing performance of the vehicle polishing coating agent is effectively exhibited and the effect of repairing small scratches is sufficiently exhibited to obtain good workability. be able to.

  And the glazing coating agent for vehicles of this invention can be suitably prepared by mix | blending each above-described component.

  In addition, the vehicular glazing coating agent of the present invention is commonly used as a glazing agent, as long as it does not impair the excellent effects of the present invention. For example, viscosity adjusting agents, anti-aging agents, ultraviolet rays Additives such as absorbents, colorants such as general pigments or dyes and fluorescent pigments, fragrances, and surfactants can be appropriately blended as necessary.

  In the present invention, as described later, the surface hardness of the cured coating film (film) of the coating agent after applying and curing the vehicle glaze coating agent is 5H or less in pencil hardness, preferably 3H or less, usually B or more. If the pencil hardness is within the above-described range, sufficient glossing performance and sustainability can be obtained.

  In addition, pencil hardness is shown as a pencil scratch value of a cured coating film from the scratch of a cured coating film measured according to JIS K 5400 8.4.2.

  The use of the vehicle glaze coating agent of the present invention thus obtained is not particularly limited. For example, metal surfaces such as wheels of vehicles (for example, automobiles and motorcycles), vehicle bodies (for example, It is used as a polishing coating agent for paint surfaces such as bonnets and door panels, and resin surfaces such as covers for vehicle bumpers and lamps (for example, head lamps, tail lamps, turn signal lamps).

  Application to the metal surface, painted surface, or resin surface is not particularly limited. For example, the sponge is impregnated with the vehicle polish coating agent of the present invention, and the metal surface, painted surface, or resin surface is rubbed with the sponge. A known method is appropriately used. The application method can be appropriately selected depending on the purpose and application, such as brushing or spray coating. In addition, after application | coating, what is necessary is just to wipe off with a cloth, paper, etc. if necessary.

  In this way, the glossy coating agent for vehicles applied to a metal surface, painted surface or resin surface is affected by the curing catalyst and moisture in the air as the solvent component such as diluent volatilizes. The moisture curable silicone oligomer is cured, and a cured coating film is formed on the metal surface, painted surface or resin surface.

  And this cured coating coats a metal surface, a paint surface, or a resin surface, can reliably fill the scratches that they have, and can reliably hide the scratches, and can also be a metal surface, a paint surface, or a resin surface. It is possible to impart a good gloss to the surface of the glass, to continuously exhibit its glossing performance, and to maintain the gloss over a long period of time.

  Furthermore, this veneering coating agent for vehicles is excellent in storage stability and can realize stable preservation.

  Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited thereto.

Example 1
・ Moisture curable silicone oligomer 95.0% by weight
(Refractive index (value measured in advance according to JIS K 0062; the same applies hereinafter): 1.403 <25 ° C.>, R ¹ (shows R ¹ represented by the general formula (1); the same applies hereinafter): Methyl, alkoxy group content: 28% by weight, kinematic viscosity: 25 mm ² / s <25 ° C>, medium polymer type)
(Product name: KR-500, manufactured by Shin-Etsu Chemical Co., Ltd.)
・ Curing catalyst (organoaluminum compound type) 5.0% by weight
(Product name: DX-9740, manufactured by Shin-Etsu Chemical Co., Ltd.)
Each of the above components was added with stirring and dissolved to obtain a vehicle gloss coating agent.

Example 2
Moisture curable silicone oligomer 40.0% by weight
(Refractive index: 1.407 <25 ° C.>, R ¹ : methyl, alkoxy group content: 24 wt%, kinematic viscosity: 100 mm ² / s <25 ° C.>, high polymer type)
(Product name: X-40-9225, manufactured by Shin-Etsu Chemical Co., Ltd.)
・ Curing catalyst (organic titanium compound type) 1.2% by weight
(Product name: D-20, manufactured by Shin-Etsu Chemical Co., Ltd.)
・ Isopropyl alcohol 58.8% by weight
Each of the above components was added to isopropyl alcohol with stirring and dissolved to obtain a vehicle glaze coating agent.

Example 3
Moisture curable silicone oligomer 40.0% by weight
(Refractive index: 1.403 <25 ° C.>, R ¹ : methyl, alkoxy group content: 28 wt%, kinematic viscosity: 25 mm ² / s <25 ° C.>, medium polymer type)
(Product name: KR-500, manufactured by Shin-Etsu Chemical Co., Ltd.)
・ Curing catalyst (Organic titanium compound type) 1.6% by weight
(Product name: D-20, manufactured by Shin-Etsu Chemical Co., Ltd.)
・ Butyl acetate 58.4 wt%
The above-mentioned components were added to butyl acetate with stirring and dissolved to obtain a veneering coating agent for vehicles.

Example 4
Moisture curable silicone oligomer 32.0% by weight
(Refractive index: 1.403 <25 ° C.>, R ¹ : methyl, alkoxy group content: 28 wt%, kinematic viscosity: 25 mm ² / s <25 ° C.>, medium polymer type)
(Product name: KR-500, manufactured by Shin-Etsu Chemical Co., Ltd.)
・ Moisture curable silicone oligomer 8.0% by weight
(Refractive index: 1.407 <25 ° C.>, R ¹ : methyl, alkoxy group content: 25 wt%, kinematic viscosity: 160 mm ² / s <25 ° C.>, thickening type)
(Product name: X-40-9250, manufactured by Shin-Etsu Chemical Co., Ltd.)
・ Curing catalyst (organic titanium compound type) 0.8% by weight
(Product name: D-20, manufactured by Shin-Etsu Chemical Co., Ltd.)
N-hexane 59.2% by weight
The above-mentioned components were added to n-hexane with stirring and dissolved to obtain a vehicle gloss coating agent.

Example 5
Moisture curable silicone oligomer 40.0% by weight
(Refractive index: 1.529 <25 ° C.>, R ¹ : methyl / phenyl (combination of methyl and phenyl, the same applies hereinafter), alkoxy group content: 15% by weight, kinematic viscosity: 40 mm ² / s <25 ° C.> Medium hardness type)
(Product name: KR-9218, manufactured by Shin-Etsu Chemical Co., Ltd.)
・ Curing catalyst (phosphoric acid type) 20.0 wt%
(Product name: X-40-2309A, manufactured by Shin-Etsu Chemical Co., Ltd.)
・ Ethylene glycol dimethyl ether 10.0% by weight
・ Methyl ethyl ketone 30.0% by weight
Each of the above components was added to ethylene glycol dimethyl ether and methyl ethyl ketone with stirring and dissolved to obtain a vehicle gloss coating agent.

Example 6
Moisture curable silicone oligomer 40.0% by weight
(Refractive index: 1.509 <25 ° C.>, R ¹ : methyl / phenyl, alkoxy group content: 17% by weight, kinematic viscosity: 100 mm ² / s <25 ° C.>, high hardness type)
(Product name: KR-510, manufactured by Shin-Etsu Chemical Co., Ltd.)
・ Curing catalyst (phosphoric acid type) 20.0% by weight
(Product name: X-40-2309A, manufactured by Shin-Etsu Chemical Co., Ltd.)
・ Toluene 40.0% by weight
Each of the above components was added to toluene with stirring and dissolved to obtain a vehicle glaze coating agent.

Example 7
Moisture curable silicone oligomer 40.0% by weight
(Refractive index: 1.435 <25 ° C.>, R ¹ : methyl / phenyl, alkoxy group content: 35 wt%, kinematic viscosity: 22 mm ² / s <25 ° C.>, impact type)
(Product name: X-40-175, curing catalyst DX-175 (organic titanium compound type) containing 5% by weight, manufactured by Shin-Etsu Chemical Co., Ltd.)
・ Isooctane 60.0% by weight
Each of the above components was added to isooctane with stirring and dissolved to obtain a vehicle gloss coating agent.

Comparative Example 1
Moisture curable silicone oligomer 40.0% by weight
(Refractive index: 1.394 <25 ° C.>, R ¹ : methyl, alkoxy group content: 45 wt%, kinematic viscosity: 5 mm ² / s <25 ° C.>, low polymer type)
(Product name: KC-89S, manufactured by Shin-Etsu Chemical Co., Ltd.)
・ Curing catalyst (Organic titanium compound type) 2.0% by weight
(Product name: D-20, manufactured by Shin-Etsu Chemical Co., Ltd.)
・ Silicon solvent 58.0% by weight
The above-mentioned components were added to a silicone solvent with stirring and dissolved to obtain a vehicle gloss coating agent.

Comparative Example 2
Moisture curable silicone oligomer 100.0% by weight
(Refractive index 1.390 <25 ° C.>, R ¹ : methyl, alkoxy group content: 45% by weight, kinematic viscosity: 1.2 mm ² / s <25 ° C.>, high hardness type)
(Product name: KR-400, curing catalyst DX-9740 (organoaluminum compound type) containing 10% by weight, manufactured by Shin-Etsu Chemical Co., Ltd.)
The above components were obtained as a vehicle polish coating agent.

Comparative Example 3
Moisture curable silicone oligomer 40.0% by weight
(Refractive index: 1.387 <25 ° C.>, R ¹ : hydrogen, alkoxy group content: 65 wt%, kinematic viscosity: 4 mm ² / s <25 ° C.>, ultra-high hardness type)
(Product name: X-40-2308, manufactured by Shin-Etsu Chemical Co., Ltd.)
・ Curing catalyst (organoaluminum compound type) 2.0% by weight
(Product name: DX-9740, manufactured by Shin-Etsu Chemical Co., Ltd.)
・ Diethylene glycol 10.0% by weight
・ Ethyl alcohol 48.0 wt%
The above-mentioned components were added to diethylene glycol and ethyl alcohol with stirring and dissolved to obtain a vehicle gloss coating agent.

Evaluation (1) Concealment of Scratches The vehicle polishing coating agent of each Example and each Comparative Example was uniformly applied to the painted surface of a vehicle having small scratches.

  After the coating, it was naturally dried for about 5 minutes, and then the surface was wiped with a clean towel. Then, after natural drying further for about one week, the concealment property of a wound was evaluated.

The results are shown in Table 1. The evaluation of the hiding property of the scratches in Table 1 was as follows.
A: Scratches are hardly noticeable.
○: The scratch is less noticeable than the uncoated part.
Δ: Scratches are slightly less noticeable than unapplied portions.
X: Scratches have almost no difference from uncoated parts.

Test Example A polish coating agent for vehicles obtained in each example and each comparative example was applied to a polished steel plate of 70 mm × 150 mm and a thickness of 1.5 mm by a roll coater method. The thickness was adjusted to 10 μm and uniformly applied.

  After coating, the film was dried for 7 days under conditions of a temperature of 25 ° C. and a humidity of 70%.

Thereafter, the following test (2) was performed and evaluated.
(2) Pencil Hardness According to JIS K 5400 8.4.2, the pencil scratch value of the cured coating film was measured from the scratch of the cured coating film. The results are shown in Table 1.
(3) Storage stability 80 mL of the vehicle glaze coating agent obtained in each Example and each Comparative Example was placed in a 100 mL capacity glass bottle, purged with nitrogen, and sealed, and in a 50 ° C. atmosphere for 1 month It was allowed to stand (store), and the changes in the “state in the container”, “curability” and “coating performance” of the polish coating agent for vehicles were evaluated.

The results are shown in Table 1. The storage stability in Table 1 was evaluated as follows.
A: No change from before storage.
○: Curability is slightly lowered, but there is no problem in coating film performance.
(Triangle | delta): Both sclerosis | hardenability and coating-film performance are falling.
X: The liquid state of the glossy coating agent for vehicles changes and cannot be used.

Example of actual vehicle test As a real vehicle, a 1998 Toyota Corolla van white painted car and a 2005 Toyota Mark II Brid black painted car were prepared.

  Next, 2 g of the vehicle polish coating agent of each example and each comparative example was taken into 5 cm × 5 cm of urethane sponge, and each was uniformly distributed in one section (about 50 cm × 50 cm) of the bonnet portion of two actual vehicles. Each was applied to the compartment.

  After applying and naturally drying for 5 minutes, the surface was wiped off with a clean towel.

Thereafter, the following tests (4) and (5) were performed and evaluated.
(4) Initial polishing performance The state of gloss immediately after application of the vehicle polishing coating agent in an actual vehicle test example was visually observed.

The results are shown in Table 1. The initial glossing performance in Table 1 was evaluated as follows.
A: There was no shading or unevenness, and a deep gloss was observed.
○: The gloss was observed.
Δ: A slight gloss was observed.
X: Gloss with shading and unevenness was observed.
(5) Persistence of polishing performance Cars were washed with a neutral car shampoo using a car wash sponge every month from the application of the vehicle polishing coating agent in the actual vehicle test example. And after application | coating, the glossiness state of the cured coating film of the bonnet after car washing at the time of January, March, and June passed was observed visually.

The results are shown in Table 1. The evaluation of the durability of the polishing performance in Table 1 was as follows.
A: A gloss maintained in almost the same state as the initial gloss was observed.
○: A gloss maintained slightly lower than the initial gloss was observed.
(Triangle | delta): The gloss maintained in the state lower than the initial gloss was observed.
X: Gloss was not observed, and a state in which there was almost no difference from the uncoated part was observed.

Claims (7)

  A gloss coating agent for vehicles, comprising a moisture curable silicone oligomer having a refractive index of 1.400 or more and a curing catalyst. The veneer polish coating agent according to claim 1, wherein the moisture-curable silicone oligomer is an alkoxysilane compound represented by the following general formula (1) or a partially hydrolyzed condensate thereof.
R ¹ _n Si (OR ² ) _4-n (1)
(In General Formula (1), R ¹ represents a hydrogen atom or a substituted or unsubstituted monovalent hydrocarbon group, R ² represents an alkyl group, and n represents an integer of 0 to 3. ¹ and R ² may be the same or different from each other.   The vehicle polish coating agent according to claim 1 or 2, wherein the surface hardness of the cured coating film of the coating agent is 5H or less in pencil hardness. R ¹ in the general formula (1) includes at least a monovalent hydrocarbon group having 4 or more carbon atoms, and is a glazing for vehicles according to any one of claims 1 to 3. Coating agent.   Furthermore, the glaze coating agent for vehicles in any one of Claims 1-4 containing the diluent.   6. The veneer polish coating according to claim 5, wherein the diluent is at least one selected from the group consisting of hydrocarbon solvents, ester solvents, glycol ether solvents, and ketone solvents. Agent.   The veneer polish coating agent according to claim 6, wherein the hydrocarbon solvent is a paraffin solvent.