JP2000169791A - Low temperature hardenable coating composition for water-related article forming water-repelleant surface and easily removing life polluting material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a coating composition which gives water repellency to the surface of a water-related housing instrument and increases the ability of removing a life polluting material by making the coating composition contain a hydroxylic group- containing siloxane polymer and an aliphatic polyisocyanate crosslinking agent. SOLUTION: The aliphatic polyisocyanate crosslinking agent (B) is mixed with the hydroxylic group-containing polysiloxane polymer (A) having number average molecular weight of 1,000-100,000 and hydrxylic value of 50-290 mg/KOH obtained by copolymerizing 1-40 wt.% of a siloxane macromonomer represented by formula I and/or formula II having a number average molecular weight of 300-30,000, 5-98 wt.% of a hydroxylic group-containing vinyl monomer and 0-94 wt.% of another unsaturated monomer copolymerizable therewith in an organic solvent in the existence of a polymerization initiator under a pressure of not more than 30 kg/cm2G at a temperature of -20-50 deg.C, an equivalent ratio of the hydroxylic group of the component A to the isocyanate group of the component B being 1/0.3-1/2.5 (wherein R1 is a 1-10C alkyl; R2, R5 and R6 are each a 1-6C divalent hydrocarbon group; R3, R4 and R7 are each H or methyl; and n is 6-300).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a coating composition, and more particularly to a low-temperature-curable coating composition for plumbing articles which forms a water-slidable surface and has easy removal of living pollutants. .

[0002]

2. Description of the Related Art Conventionally, reinforced plastic molded products such as SMC (sheet molding compound) and BMC (bulk molding compound) have been used for water-supply housing equipment such as bathtubs, washbasins, toilets, and the like. ing.

[0003] However, household pollutants such as scales, cosmetics (lipstick, nail polish, etc.), magic ink, etc. adhere to the surface of the reinforced plastic molded product, and detergents or compounds must be used to remove these. There was a problem that it had to be done.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, to be able to cure at low temperature, to impart lubricity to the surface of household equipment for water use, and to easily remove household pollutants. An object of the present invention is to provide a coating material having properties.

[0005]

Means for Solving the Problems The present inventors have solved the above-mentioned problems and have been able to cure at a low temperature, impart water-slidability to the surface of household equipment for water use, and easily remove household pollutants. Intensive studies have been conducted to develop a coating material having a property.

As a result, they have found that a film formed by crosslinking and curing a specific hydroxyl group-containing siloxane polymer together with a specific crosslinking agent meets the above object, and have completed the present invention.

Thus, according to the present invention, (A) (a)
formula

[0008]

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In the formula, R ¹ represents an alkyl group having 1 to 10 carbon atoms; R ² represents a divalent hydrocarbon group having 1 to 6 carbon atoms; R ³ represents a hydrogen atom or a methyl group; Is 6 ~
Is a number of 300 and / or

[0010]

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In the formula, R ⁴ and R ⁷ are the same or different and represent a hydrogen atom or a methyl group; R ⁵ and R ⁶ are the same or different and represent a divalent hydrocarbon group having 1 to 6 carbon atoms; Is 6
Obtained by copolymerization of 1 to 40% by weight of a siloxane macromonomer represented by the following formula: (b) a hydroxyl group-containing vinyl monomer, and (c) another unsaturated monomer copolymerizable therewith, if necessary. Hydroxyl value is 50 ~
For a plumbing article having a water-slidable surface characterized by comprising a hydroxyl group-containing siloxane polymer in the range of 290 mg KOH / g and (B) an aliphatic polyisocyanate cross-linking agent and having easy removal of living pollutants. A low temperature curable coating composition is provided.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the coating composition of the present invention will be described in more detail.

The siloxane macromonomer (a) In the present invention, the hydroxyl-containing siloxane polymer (A)
Siloxane macromonomer (a) used for the production of
Is to impart lubricity to the surface of the cross-linked coating film, the following formula

[0014]

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And / or the following formula

[0016]

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Wherein R ¹ is an alkyl group having 1 to 10 carbon atoms, and R ² is an alkyl group having 1 to 10 carbon atoms.
6, a divalent hydrocarbon group, R ³ represents a hydrogen atom or a methyl group, R ⁴ and R ⁷ are the same or different and represent a hydrogen atom or a methyl group, and R ⁵ and R ⁶ are the same or different Represents a divalent hydrocarbon group having 1 to 6 carbon atoms;
And n mean the average degree of polymerization of dimethylsiloxane units, and both are numbers in the range of 6 to 300, preferably 6 to 100.

The siloxane macromonomer (a) is generally in the range of 300 to 30,000, preferably 500 to 20,000.
It can have a number average molecular weight in the range of 00.

Hydroxyl-containing vinyl monomer (b) In the present invention, the hydroxyl-containing siloxane polymer (A)
Hydroxyl-containing vinyl monomer (b) used for the production of
Has both a role as a cross-linking functional group with a cross-linking agent and a role of providing lubricity, and specifically, for example,
C2-C8 hydroxyalkyl esters of acrylic acid or methacrylic acid such as 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, and hydroxybutyl (meth) acrylate Monoesters of polyether polyols such as polyethylene glycol, polypropylene glycol and polybutylene glycol with unsaturated carboxylic acids such as (meth) acrylic acid; hydroxyalkyl vinyl ethers, allyl alcohol, hydroxyalkyl esters of (meth) acrylic acid, Poly) alkylene glycol mono (meth) acrylate and the like and lactones (for example, ε-caprolactone,
adduct with γ-valerolactone); monoethers of polyether polyols such as polyethylene glycol, polypropylene glycol and polybutylene glycol with hydroxyl-containing unsaturated monomers such as 2-hydroxyethyl (meth) acrylate; A saturated carboxylic acid;
Adducts with monoepoxy compounds such as Cardura E10 (manufactured by Shell Chemical) or α-olefin epoxide; glycidyl (meth) acrylate and acetic acid, propionic acid,
adducts with monobasic acids such as pt-butylbenzoic acid and fatty acids; acid anhydride-containing unsaturated compounds such as maleic anhydride and itaconic anhydride; ethylene glycol;
Monoester or diester with glycols such as 6-hexanediol and neopentyl glycol; containing hydroxyalkyl vinyl ethers such as hydroxyethyl vinyl ether and chlorine such as 3-chloro-2-hydroxypropyl (meth) acrylate. Examples thereof include a hydroxyl group-containing monomer and allyl alcohol.

Other unsaturated monomers (c) Examples of other unsaturated monomers (c) copolymerized with the siloxane macromonomer (a) and the hydroxyl group-containing vinyl monomer (b) as required include acrylic acid, Methacrylic acid, crotonic acid, itaconic acid, maleic acid, fumaric acid, 2-carboxyethyl (meth) acrylate, 2-carboxypropyl (meth) acrylate,
Carboxyl group-containing unsaturated monomers such as 5-carboxypentyl (meth) acrylate; methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, (meth) Butyl acrylate (n-, i-, t-), (meth)
Hexyl acrylate, 2-ethylhexyl (meth) acrylate, n-octyl (meth) acrylate, decyl (meth) acrylate, lauryl (meth) acrylate, stearyl (meth) acrylate, cyclohexyl (meth) acrylate, etc. Acrylic acid or methacrylic acid having 1 to 1 carbon atoms
An alkyl ester or cycloalkyl ester of 18;
C2-C18 alkoxyalkyl esters of acrylic acid or methacrylic acid, such as methoxybutyl (meth) acrylate, methoxyethyl (meth) acrylate, and ethoxybutyl (meth) acrylate; ethyl vinyl ether, n
-Chain alkyl vinyl ethers such as propyl vinyl ether, isopropyl vinyl ether, butyl vinyl ether, t-butyl vinyl ether, pentyl vinyl ether, hexyl vinyl ether and octyl vinyl ether; cycloalkyl vinyl ethers such as cyclopentyl vinyl ether and cyclohexyl vinyl ether; phenyl vinyl ether and trivinyl phenyl ether Aryl vinyl ethers such as benzyl vinyl ether and phenethyl vinyl ether; allyl ethers such as allyl glycidyl ether and allyl ethyl ether; vinyl acetate, vinyl propionate, vinyl lactate, vinyl butyrate, vinyl isobutyrate, and vinyl caproate , Vinyl isocaproate, vinyl pivalate, caprin Vinyl, Beobamonoma - vinyl esters of (Shell Chemical Co., Ltd.) and the like; isopropenyl acetate, propenyl esters of isopropenyl propionate, ethylene, propylene, butylene, olefinic compounds such as vinyl chloride; styrene, alpha-methyl styrene,
Vinyl aromatic compounds such as vinyltoluene and α-chlorostyrene; N, N-dimethylaminoethyl (meth) acrylate, N, N-diethylaminoethyl (meth) acrylate, Nt-butylaminoethyl (meth) acrylate, etc. Nitrogen-containing alkyl (meth) acrylate; acrylamide, methacrylamide, N-methyl (meth) acrylamide, N-ethyl (meth) acrylamide, N
-Methylol (meth) acrylamide, N-methoxymethyl (meth) acrylamide, N-butoxymethyl (meth) acrylamide, N, N-dimethyl (meth) acrylamide, N, N-dimethylaminopropyl (meth) acrylamide, N, N -Dimethylaminoethyl (meth)
Polymerizable amides such as acrylamide; aromatic nitrogen-containing monomers such as 2-vinylpyridine, 1-vinyl-2-pyrrolidone and 4-vinylpyridine; polymerizable nitriles such as acrylonitrile and methacrylonitrile; vinyltrimethoxysilane and vinyl Triethoxysilane, vinyltris (2-methoxyethoxy) silane, γ- (meth) acryloyloxypropyltrimethoxysilane, vinyltriacetooxysilane, β- (meth) acryloyloxyethyltrimethoxysilane, γ- (meth) acryloyloxy Hydrolyzable alkoxysilyl group-containing monomers such as propyltriethoxysilane; polymerizable glycidyl compounds such as glycidyl (meth) acrylate and allyl glycidyl ether; diallyl phthalate, diallyl isophthalate, triallyl iso Allyl monomers such as annulate, diallyltetrabromophthalate, pentaerythritol diallyl ether and allyl glycidyl ether; perfluorobutylethyl (meth) acrylate, perfluoroisononylethyl (meth) acrylate, perfluorooctylethyl (meth) ) Perfluoroalkyl (meth) acrylates such as acrylates; ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, 1,3-butylene Glycol di (meth) acrylate, 1,4-butanediol diacrylate, glycerin di (meth) acrylate, glycerin tri (meth) acrylate, trimethylo Propanedioic (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol di (meth) acrylate, pentaerythritol tri (meth)
Acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, hydroxyisocyanurate tri (meth)
Acrylate, neopentyl glycol diacrylate, 1,6-hexanediol diacrylate, glycerol allyloxydi (meth) acrylate, 1,1,1
Tris (hydroxymethyl) ethanedi (meth) acrylate, 1,1,1-tris (hydroxymethyl) ethanetri (meth) acrylate, triallyl isocyanurate, triallyl trimellitate, diallyl terephthalate, diallyl phthalate, diallyl isophthalate,
Examples thereof include (meth) acrylates of polyhydric alcohols such as pentaerythritol diallyl ether and divinylbenzene.

Hydroxyl-containing siloxane polymer (A) In the present invention, hydroxyl-containing siloxane polymer (A)
Can be obtained by copolymerizing the siloxane macromonomer (a), the hydroxyl group-containing vinyl monomer (b), and another unsaturated monomer (c) copolymerizable therewith, if necessary.

The copolymerization ratio of the siloxane macromonomer, the hydroxyl group-containing vinyl monomer and, if necessary, other unsaturated monomers copolymerizable therewith can vary widely depending on the desired physical properties of the hydroxyl group-containing siloxane polymer (A). In general, it is desirable to be within the following range based on the total amount of the above monomers.

Siloxane macromonomer (a): 1-4
0% by weight, especially 2 to 25% by weight Hydroxyl-containing vinyl monomer (b): 5 to 98% by weight, especially 10 to 70% by weight Other unsaturated monomer (c): 0 to 94% by weight, especially 5 to 5%
The copolymerization of the above monomers is usually carried out in an organic solvent in the presence of about 0.01 to about 8 parts by weight of a polymerization initiator per 100 parts by weight of the total amount of the monomers, from about -20 ° C to about 20 ° C. The reaction can be carried out at a temperature of 150 ° C. at normal pressure or optionally under pressure up to about 30 kg / cm ² G.

The hydroxyl group-containing siloxane polymer (A) thus obtained is generally 1,000 to 100,000,
Preferably it may have a number average molecular weight in the range of 3,000 to 50,000. Furthermore, the hydroxyl group-containing siloxane polymer (A) generally has a content of 50 to 290 mg KO.
It may have a hydroxyl value in the range of H / g, preferably 90-200 mg KOH / g.

Crosslinking Agent Component (B) In the present invention, an aliphatic polyisocyanate compound is used as a crosslinking agent for crosslinking and curing the above-mentioned hydroxyl-containing siloxane polymer (A).

Examples of the aliphatic polyisocyanate compound include hexamethylene diisocyanate, trimethylene diisocyanate, 1,4-tetramethylene diisocyanate, pentamethylene diisocyanate,
Aliphatic diisocyanates such as 1,2-propylene diisocyanate, 1,2-butylene diisocyanate, 1,3-butylene diisocyanate, 2,3-butylene diisocyanate, trimethylhexamethylene diisocyanate, dimer acid diisocyanate, and lysine diisocyanate; Adducts, isocyanuric ring type adducts; excessive amounts of these polyisocyanate compounds, ethylene glycol, propylene glycol, trimethylolpropane, hexanetriol,
An isocyanate-terminated prepolymer obtained by reacting a low-molecular-weight active hydrogen-containing compound such as castor oil can be used.

Coating Composition According to the Present Invention The coating composition of the present invention is obtained by adding an appropriate organic solvent to the above-mentioned hydroxyl-containing siloxane polymer (A) and the crosslinking agent component (B) and mixing them as appropriate. Can be adjusted.

It is desirable that the coating composition of the present invention is a two-pack type in which the component (A) and the component (B) are separated, and that both components are mixed immediately before use.

The mixing ratio of the crosslinking agent component (B) to the siloxane polymer (A) can be varied over a wide range depending on the type of the crosslinking agent component (B) and the like. )) To the equivalent ratio of the isocyanate group of the crosslinking agent component (B) to the hydroxyl group of 1 / 0.3 to 1
/2.5, preferably in the range of 1 / 0.5 to 1 / 2.0.

The coating composition of the present invention may further contain, if necessary, for example, a color pigment, an extender pigment, a rust preventive pigment, a dye,
Surfactants and other additives known per se, which are commonly used in paints, can also be added.

The coating composition of the present invention thus obtained is useful for application to the surface of household equipment for water use such as bathtubs, washbasins, and toilets.

The coating composition of the present invention is applied to these devices by a method known per se, such as spray coating, brush coating, roller coating, roll coating, dip coating, and curtain flow coater coating. Can be. Further, the thickness of the applied film can be changed according to the use of the object to be coated, etc., but generally, the cured film thickness is preferably 1 to 100 μm, particularly preferably about 10 to 50 μm. .

The conditions for crosslinking and curing of the coating composition of the present invention are determined according to the type of the hydroxyl-containing siloxane polymer (A) and the crosslinking agent component (B) used in the preparation of the composition. Usually, room temperature to about 100 ° C, preferably room temperature to about 80 ° C, more preferably room temperature to about 6 ° C.
Conditions at a temperature of 0 ° C. for about 10 to about 60 minutes can be used.

The surface of the coating film formed by using the coating composition of the present invention in this manner is excellent in lubricity. For example, the surface of an object coated with a conventional fluorinated ethylene resin becomes water droplets. The contact angle of water is about 108 °, but the mass 1
Even when the film on which 0 mg of water droplets are attached is tilted at 90 °, the water droplets remain stopped and do not fall under their own weight. However, the film formed from the polymer composition of the present invention has a water droplet contact angle of about 100 °. And the mass 10 attached to the film
The water droplets of mg show excellent water-slip properties such that the film starts to slide under its own weight and falls only by tilting the film at an angle within 50 ° from the horizontal plane.

Thus, the coating composition of the present invention is extremely useful as a surface treatment agent for household equipment for water use, which prevents adhesion of water droplets and easily adheres to living pollutants.

[0036]

According to the present invention, a water-slidable surface is formed,
Also provided is a low-temperature curable coating composition for plumbing articles having easy removal of living pollutants.

[0037]

The present invention will be described more specifically with reference to the following examples. Hereinafter, simply “parts” and “%” mean “parts by weight” and “% by weight”, respectively.

Production Example 1 A four-necked flask equipped with a thermometer, a reflux condenser, a stirrer and a dropping device was charged with 53.8 parts of xylene and 28 parts of methyl isobutyl ketone, heated under stirring, and kept at 115 ° C. Was. Next, at 115 ° C., a mixture composed of the monomers shown in Table 1 and 4.2 parts of azobisisobutyronitrile as a polymerization initiator was added dropwise over 3 hours. After dropping, 1
Aged at 15 ° C for 2 hours, solid content concentration 55%, hydroxyl value 1
A solution of a hydroxyl group-containing siloxane polymer (A-1) having 51 mgKOH / g and a number average molecular weight of 12,000 was obtained.

Production Examples 2 to 4 Except that the monomer compositions shown in Table 1 below were used, the hydroxyl group-containing siloxane polymers (A-2) to
A solution of (A-4) was obtained. The special values of the obtained polymer are also shown in Table 1.

In Table 1, (Note 1) “Silaprene FM-0721”: a methacryl group-containing siloxane macromonomer manufactured by Chisso Corporation, trade name, molecular weight of about 5,000, structural formula

[0041]

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(Note 2) “Silaprene FM-772”
1 ": a methacryl group-containing siloxane macromonomer, manufactured by Chisso Corporation, trade name, molecular weight about 5,000, structural formula

[0043]

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[0044]

[Table 1]

Examples 1 to 9 and Comparative Examples 1 to 2 According to the composition (solid content) shown in Table 2 below, the hydroxyl-containing siloxane polymer (A), the crosslinking agent component (B) and the catalyst were mixed and stirred, and A composition was obtained.

In Table 2, (Note 3) "TPA90EX": trade name, manufactured by Asahi Kasei Corporation, hexamethylene diisocyanate isocyanurate polymer, solid content 90%.

(Note 4) “N-3500”: manufactured by Sumitomo Bayer Urethane Co., Ltd., trade name “Dismodule N-3”
500 ", a nullate of hexamethylene diisocyanate, solid content 100%.

(Note 5) "U-100": Nitto Kasei Corporation
"Neostan U-100", trade name, dibutyltin dilaurate.

(Note 6) "Rethane PG2KA clear":
2-part urethane curable paint, manufactured by Kansai Paint Co., Ltd.
Main agent / hardener mixture ratio = 2/1.

The polymer compositions obtained in Examples 1 to 9 were applied on a glass plate using a No. 10 bar coater, heated under the conditions for forming a crosslinked coating film shown in Table 2, and further kept at room temperature for 1 week. To give a cured film for testing.

A performance test was performed on the obtained cured test film. Table 2 also shows the results. The test method in Table 2 is as follows.

Initial curability : The coating film was rubbed 30 times with ethanol-soaked gauze, and the appearance was evaluated according to the following criteria.

：: No abnormality, Δ: Slight shine is observed, ×: Severe shine.

Chemical resistance (No. 1) : The coating film was used as “Look toilet detergent” (Lion Corporation product name, acidic solution)
Was immersed at 25 ° C. for 24 hours, then taken out and wiped with a gauze soaked with ethanol, and the appearance was evaluated according to the following criteria.

：: No abnormality, Δ: Slight swelling observed, ×: Swelling observed over the entire coated surface.

Chemical resistance ( No. 2) : The coating film is "domest"
After immersing in (Nippon Lever Co., Ltd. product, trade name, alkaline solution) at 25 ° C. for 24 hours, it was taken out and wiped off with ethanol-soaked gauze, and the appearance was evaluated according to the following criteria.

：: no abnormality, Δ: slight swelling observed, ×: swelling observed on the entire coated surface.

Magic repellency : A line was drawn on the coated surface with a large (red) oil-based magic ink, and the repellency was examined.

：: repells like oil droplets, x: does not repel at all, and a line can be drawn.

Magic removability : A line was drawn on the coated surface with a large oil-based magic ink (red), and the coating was evaluated after drying for 1 hour.

：: Can be easily wiped off with a cloth. ×: Line remains clearly.

Nail polish removal : A line was drawn on the coated surface with "Noevir Nail Color 341" (trade name, product of Noevir Co., Ltd.) and dried for 1 hour to evaluate.

：: Can be easily wiped off with a cloth. ×: Clearly remains when wiped with a cloth.

Stain removal (No. 1) : Instant coffee (Ajinomoto General Foods Co., Ltd. product),
"Charmy Compact" (Lion Corporation product, trade name, household detergent), a suspension obtained by mixing tap water at a weight ratio of 5: 1: 100 was sprayed, followed by drying at 70 ° C. for 5 minutes. The appearance was evaluated by wiping with a cloth.

：: no stain at all, Δ: slightly stained, ×: noticeable stain.

Stain removal ( No. 2) : The coated plate was left on a sink (a place where domestic wastewater is applied) for one month, dried, wiped off with a cloth, and evaluated for appearance.

：: no stain at all, Δ: slightly stained, ×: noticeable stain.

Slope angle : CA- manufactured by Kyowa Interface Science Co., Ltd.
Using an X-type contact angle meter, under an atmosphere of 23 ° C. and 65% RH, about 10 mg of deionized water is dropped on the film using a micro syringe, and the glass plate is slowly tilted, and the water droplets slide. The starting angle was defined as the sliding angle.

Contact angle : CA- manufactured by Kyowa Interface Science Co., Ltd.
Using an X-type contact angle meter, about 10 mg of deionized water was dropped on the film using a microsyringe under an atmosphere of 23 ° C. and 65% RH, and the angle formed by the film and the tangent to the end of the water droplet. Was measured within one minute from the dropping of the droplet.

[0070]

[Table 2]

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4J034 BA03 DA01 DB03 DB07 DC50 DM01 DM08 DM18 HA01 HA02 HA07 HA11 HA18 HB08 HC03 JA44 QA02 QA03 QB11 QB13 QB17 QD06 RA07 4J038 CG141 CH051 CH121 CL001 DG272 GA03 NA05 NA06

Claims (5)

[Claims] (1) Formula (A) (a) In the formula, R ¹ represents an alkyl group having 1 to 10 carbon atoms, R ²
Represents a divalent hydrocarbon group having 1 to 6 carbon atoms, R ³ represents a hydrogen atom or a methyl group, m represents a number of 6 to 300, and / or a compound represented by the formula: In the formula, R ⁴ and R ⁷ are the same or different and represent a hydrogen atom or a methyl group, and R ⁵ and R ⁶ are the same or different and have 1 carbon atom.
Represents a divalent hydrocarbon group of from 6 to 6, and n is a number of from 6 to 300.
% By weight, (b) a hydroxyl group-containing vinyl monomer, and if necessary, (c) a hydroxyl value obtained by copolymerization of another unsaturated monomer copolymerizable therewith with a hydroxyl value of 50 to 290 mg KO.
A hydroxyl-containing siloxane polymer in the range of H / g,
And (B) a low-temperature curable coating composition for plumbing articles having a water-slidable surface and being easily removable from living contaminants, comprising an aliphatic polyisocyanate crosslinking agent. 2. The composition according to claim 1, wherein the hydroxyl group-containing siloxane polymer (A) has a hydroxyl value in the range of 90 to 200 mgKOH / g. 3. The equivalent ratio of the hydroxyl group of the hydroxyl group-containing siloxane polymer (A) to the isocyanate group of the aliphatic polyisocyanate crosslinking agent (B) is in the range of 1 / 0.3 to 1 / 2.5. A composition as described. 4. The composition according to claim 1, wherein a water droplet having a mass of 10 mg on the surface is capable of forming a film that starts sliding at an inclination angle of 50 ° or less from a horizontal plane by its own weight. 5. A plumbing article coated with the composition according to claim 1.