JP2010163553A - Abrasive composition and polishing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an abrasive composition which has satisfactory damage removing properties and wiping properties and has excellent re-coating properties and by which satisfactory glossiness can be imparted to a coating surface without giving a polishing damage to the coating surface, the polishing damage and white blur are not floated and a working step can be shortened without the need of defatting treatment operation even when the abrasive composition is used before coating treatment, and to provide a polishing method. <P>SOLUTION: The abrasive composition includes abrasive particles, a hydrocarbon-based solvent, a lubricant made of a silicone elastomer (except a silicone oil-impregnated silicone elastomer), a surfactant, a thickner and water. In the polishing method, the coating surface is polished by using the abrasive composition and a single action polisher and a double action polisher to remove a damage. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an abrasive composition and a polishing method suitable for polishing a painted surface of, for example, automobile coating or building coating.

  Conventionally, when polishing painted surfaces such as automobile paints and building paints, oil-based abrasive compositions containing a small amount of petroleum solvents such as mineral spirits, emulsifiers, waxes, abrasives, silicone oils, water, and petroleum An aqueous type abrasive composition in which an abrasive is dispersed in a water-based emulsifier or saponified wax component emulsified with a solvent or silicone oil has been used.

Such an abrasive composition is designed to have a large abrasive particle size in order to remove scratches on the painted surface. For this reason, large scratches on the painted surface can be removed, but many fine scratches such as line scratches are easily attached, and gloss after polishing is difficult to obtain.
Therefore, as a method for improving the gloss of the painted surface after polishing, a method of blending dimethyl silicone oil has been proposed (for example, see Patent Document 1). Dimethyl silicone oil can improve the gloss of the coating film by changing the refractive index of light on the painted surface. Moreover, since it has a defoaming effect, an abrasive | polishing agent composition with few foams can be obtained.
In addition, a method for blending polyethylene wax or the like into an abrasive composition to make polishing scratches inconspicuous has been proposed (see, for example, Patent Document 2).

JP 2000-328045 A Japanese Patent No. 2848657

However, as described in Patent Document 1, with an abrasive composition containing dimethyl silicone oil, for example, when the painted surface of an automobile paint is polished, the dimethyl silicone oil drops off after rain or car wash, and scratches and white blurring appear. A rising phenomenon was seen.
In order to confirm these phenomena more easily, the coated surface polished with the abrasive composition may be degreased with an alcohol solvent such as isopropyl alcohol or a hydrocarbon solvent such as normal hexane. In the case where dimethyl silicone oil is blended in the abrasive composition, when the coated surface after polishing is degreased, fine line scratches and white blurred scratches emerge.
Such a collection of fine flaws is observed more clearly, particularly under sunlight or mercury lamps, and this significantly impairs the appearance of the painted surface.

Also, after polishing with an abrasive composition containing dimethylsilicone oil, if a coating treatment such as a glass-based coating treatment is performed, the coating process is being performed by a solvent having a strong dissolving power contained in the glass-based coating agent. Or whitening after work. In order to prevent this whitening phenomenon, an operation such as degreasing the painted surface after polishing with a degreasing solvent before coating treatment is necessary, and the work efficiency is likely to be lowered.
Furthermore, dimethyl silicone oil has been pointed out as a causative substance that causes the paint to repel when it is repainted on the painted surface after polishing. Therefore, the abrasive | polishing agent composition which mix | blended dimethyl silicone oil was inferior to repaintability.

In addition, in the case of an abrasive composition containing polyethylene wax or the like as described in Patent Document 2, since the surface is temporarily smoothed by embedding wax in fine scratches generated by polishing, with time, There was a problem that the wax was dropped and the polishing scratches became noticeable again.
Incidentally, the abrasive composition is required to have excellent wiping property after polishing as well as scratch removability, but the conventional abrasive composition does not necessarily satisfy the wiping property.

  The present invention has good scratch removability and wiping properties, is excellent in repaintability, imparts a good gloss without scratching the painted surface, and causes polishing scratches and white blurring. In addition, an object of the present invention is to provide an abrasive composition and a polishing method that can shorten the work process without requiring a degreasing operation even if used before the coating treatment.

  As a result of intensive studies to solve the above problems, the present inventors use an abrasive composition that combines a specific lubricant, abrasive particles, hydrocarbon solvent, surfactant, and thickener. Good scratch removal, wiping, and repaintability are obtained. Polished scratches do not float after rain or car wash, and require degreasing even if used before coating. And found that not. And based on this knowledge, it came to complete this invention.

The present invention employs the following configuration.
[1] An abrasive comprising a lubricant, a surfactant, a thickener and water comprising abrasive particles, a hydrocarbon solvent, and a silicone elastomer (excluding silicone oil-impregnated silicone elastomer). Composition.
[2] 0.1 to 10% by mass of a lubricant comprising 5 to 30% by mass of abrasive particles, 7 to 40% by mass of a hydrocarbon solvent, and a silicone elastomer (excluding silicone oil-impregnated type silicone elastomer), surface activity The abrasive composition according to [1], comprising 0.2 to 5% by mass of an agent, 0.1 to 5% by mass of a thickener, and 25 to 85% by mass of water.
[3] The polishing according to [1] or [2], wherein the abrasive particles are α-alumina having an α-crystal particle diameter of 1 μm or less and an average particle diameter of 0.3 to 3 μm. Agent composition.
[4] A polishing method characterized by using the abrasive composition according to any one of [1] to [3], polishing a coated surface using a single action polisher and a double action polisher, and extinguishing scratches. .
[5] The polishing method according to [4], wherein the polishing is performed before a glass coating treatment or a coating treatment according to the glass coating treatment.

According to the abrasive composition of the present invention, it has good scratch removability in polishing a coated surface, and can impart good gloss without causing polishing scratches. In addition, since the abrasive composition of the present invention has good wiping properties after polishing, it is excellent in polishing workability, and since repaintability is good, even if the painted surface after polishing is further repainted with paint or the like, Can be suppressed. Furthermore, since the scratched scratches are less likely to cause scratches and white blurring again due to, for example, rainfall or car wash, excellent gloss can be maintained for a long period of time. In addition, even if it is used before a coating process such as a glass-based coating process, it is not necessary to degrease with a solvent after polishing, so that the work process of the coating process can be shortened.
Moreover, according to the polishing method of the present invention, scratches on the painted surface can be sufficiently removed, and gloss can be imparted to the painted surface. Further, polishing scratches and white blurring do not appear, and even if used before the coating process, the work process can be shortened without requiring a degreasing operation.

[Abrasive composition]
The abrasive composition of the present invention contains abrasive particles, a hydrocarbon solvent, a lubricant composed of a silicone elastomer, a surfactant, a thickener and water.

(Abrasive particles)
Examples of the abrasive particles include fine particles such as cerium oxide, zirconium oxide, aluminum oxide, colloidal silica, calcium carbonate silicon carbide, and silicon nitride. Among these, aluminum oxide, specifically α-alumina is preferable, and α-alumina having an α-crystal particle diameter of 1 μm or less and an average particle diameter of 0.3 to 3 μm is particularly preferable.

If the α-crystal particle diameter of α-alumina exceeds 1 μm, white blurring or polishing scratches may appear if water adheres to the coated surface polished with the abrasive composition due to, for example, rain or car wash. It becomes easy to do. The α-alumina particle diameter of α-alumina is more preferably 0.7 μm or less. Further, the lower limit of the α-crystal particle diameter is preferably 0.1 μm or more.
On the other hand, if the average particle diameter of α-alumina is less than 0.3 μm, the polishing effect tends to be reduced, and if it exceeds 3 μm, polishing scratches tend to adhere to the painted surface. The average particle size is preferably 1.0 to 2.0 μm.
Examples of such α-alumina include “Alumina A-32”, “Alumina A-33F”, “Alumina A-43L”, “Alumina A-50F”, “Alumina A-50K”, “ Alumina A-50N "," Alumina AES-11 "," Alumina AMS-2 "manufactured by Sumitomo Chemical Co., Ltd.

In the present invention, the α-crystal particle size is a particle size of a single crystal and is a value obtained by observation with a scanning electron microscope (for example, “S-2400” manufactured by Hitachi, Ltd.).
The average particle diameter is a value determined by measurement with a laser diffraction / scattering particle size distribution measuring apparatus (for example, “LA-920” manufactured by Horiba, Ltd.).

  The content of the abrasive particles is preferably 5 to 30% by mass and more preferably 10 to 25% by mass in 100% by mass of the abrasive composition. If the content of the abrasive particles is within the above range, scratches, dirt, stains, etc. on the painted surface can be efficiently scraped off. If the content of the abrasive particles is less than 5% by mass, it tends to be difficult to obtain a sufficient polishing effect. If the content exceeds 30% by mass, although the polishing effect can be obtained, the coated surface may be damaged by polishing, The load tends to increase.

(Hydrocarbon solvent)
As the hydrocarbon solvent, a solvent considering volatility is used. In the present invention, “volatile” is determined by the boiling point or the distillation temperature. As the hydrocarbon solvent, it is preferable to use a hydrocarbon solvent having an initial boiling point in distillation of 150 ° C. or higher and an end point of 350 ° C. or lower. If the initial boiling point is less than 150 ° C, the hydrocarbon solvent tends to volatilize, and there is a tendency that sufficient polishing cannot be performed. If the end point exceeds 350 ° C, the hydrocarbon solvent is difficult to volatilize, and it takes time to finish polishing. Tend to require.

  Such hydrocarbon solvents include “Isolol 300” and “Isolol 400” manufactured by Nippon Oil Corporation, “Isopar G”, “Isopar H”, “Isopar L” and “Isopar M” manufactured by ExxonMobil. “IP Solvent 1620”, “IP Solvent 2028”, “IP Solvent 2835” manufactured by Idemitsu Kosan Co., Ltd., “Shellsol MC311”, “Shellsol MC422”, “Shellsol MC531”, “Shellsol” manufactured by Shell Sekiyu KK Isoparaffin hydrocarbons such as MC611; “No. O Solvent” manufactured by Nippon Oil Corporation, “NS Clean 100”, “NS Clean 110”, “NS Clean 200”, “NS Clean 220” manufactured by Japan Energy , “NS Clean 230”, “Smoyl P-40” manufactured by Matsumura Oil Co., Ltd. Normal paraffinic hydrocarbons such as Moyl P-60 and Sumoy P-80; Exxon Mobil's Exol D40, Exol D80, Exol D110, Exol D130, Idemitsu Kosan Such as “Dafney Cleaner SD3”, “Dafney Cleaner NM”, “Dafney Cleaner NH”, “Dafney Cleaner AR2”, “Dafney Cleaner AR3”, “Dafney Cleaner MD3”, “Shellsol D70” manufactured by Shell Sekiyu Examples thereof include, but are not limited to, naphthenic hydrocarbons. These hydrocarbon solvents may be used alone or in combination of two or more.

  The content of the hydrocarbon-based solvent is preferably 7 to 40% by mass and more preferably 10 to 30% by mass in 100% by mass of the abrasive composition. When the content of the hydrocarbon solvent is within the above range, dirt (especially organic dirt) on the painted surface can be efficiently scraped off. When the content of the hydrocarbon solvent is less than 7% by mass, it is difficult to obtain a sufficient polishing effect and the load during operation tends to increase, and when it exceeds 40% by mass, the resin forming the coating film is swollen or There is a risk of dissolving.

(Lubricant)
The lubricant is made of a silicone elastomer (excluding silicone oil-impregnated silicone elastomer). By using such a lubricant, it becomes possible to impart appropriate extensibility to the abrasive particles and to suppress the adhesion of the abrasive composition to the painted surface, and therefore, the abrasive composition has good wiping properties, and Repaintability can be imparted. Further, even if water adheres to the coated surface polished with the abrasive composition of the present invention due to, for example, rain or a car wash, it is possible to suppress the occurrence of white blurring or the emergence of polishing scratches. Furthermore, even if a coating process such as a glass-based coating process is performed after polishing, it is possible to suppress the occurrence of a whitening phenomenon during or after the coating process. Therefore, it is not necessary to perform a degreasing process after the polishing, thereby shortening the work process.
When a lubricant composed of a silicone oil-impregnated silicone elastomer is used, dimethyl silicone oil remains on the painted surface, and surface inhibition tends to occur when various types of coating are applied to the painted surface after polishing. Moreover, when the painted surface after polishing is repainted, the adhesion of the coating film tends to be lowered.

  As the silicone elastomer, those dispersed with a surfactant can be used. For example, Tospearl series such as “Trefill E-506S”, “BY29-129”, “DY33-440F” manufactured by Toray Dow Corning Co., Ltd., “Tospearl 120”, “Tospearl 140” manufactured by GE Toshiba Silicone However, it is not limited to these.

  0.1-10 mass% is preferable in 100 mass% of abrasive | polishing agents composition, and, as for content of the lubricant which consists of silicone elastomers, 0.3-5 mass% is more preferable. When the content of the lubricant is within the above range, the elongation property of the abrasive composition and the wiping property with a waste cloth after polishing are improved, and the polishing workability is improved. If the content of the lubricant is less than 0.1% by mass, the effect of improving the polishing workability tends to be difficult to obtain, and if it exceeds 10% by mass, the polishing effect tends to decrease.

(Surfactant)
The surfactant is used for the purpose of emulsifying the hydrocarbon solvent described above. There is no restriction | limiting in particular as surfactant, For example, a nonionic surfactant, an anionic surfactant, an amphoteric surfactant etc. are mentioned.
Nonionic surfactants include water-soluble polyoxyethylene secondary alcohol ether, polyoxyalkylene alkyl ether, polyoxyethylene alkylphenyl ether, polyoxyethylene fatty acid amide, polyoxyethylene alkylamine, polypropylene glycol ethylene oxide Polyethylene glycol type such as adducts; polyoxyethylene fatty acid ester, polyhydric alcohol fatty acid ester, polyoxyethylene polyhydric alcohol fatty acid ester, polyoxyethylene mono or di or tri fatty acid ester, sorbitan mono or di or tri fatty acid ester, sorbitan Examples include polyhydric alcohol types such as ethylene oxide adducts of mono, di, or tri fatty acid esters, and sucrose fatty acid esters. In addition, as commercially available products, “Reodol TW-L120” manufactured by Kao Corporation, “Softanol 90” manufactured by Nippon Shokubai Co., Ltd., “Sannonic HD-100”, “Ionette MO-400” manufactured by Sanyo Chemical Industries, Ltd., Sakamoto Pharmaceutical Co., Ltd. “S-FACE O-601P”, “S-FACE O-1001P”, and the like are available.

  Examples of the anionic surfactant include aliphatic monocarboxylate, N-acyl sarcosine, N-acyl glutamate, and the like; resin fatty acid salt such as rosin tol oil fatty acid salt; alkyl sulfosuccinate, dialkyl Sulfosuccinate, alkane sulfonate, α-olefin sulfonate, alkylbenzene sulfonate, alkyl naphthalene sulfonate, alkyl diphenyl ether sulfonate, naphthalene sulfonate, N-methyl-N-alkyl taurate, etc. Sulfate salt type; sulfate ester type such as alkyl sulfate ester salt, polyoxyethylene higher alcohol ether sulfate salt, polyoxyethylene alkylphenyl ether sulfate salt; alkyl phosphate salt, polyoxyethylene higher alcohol phosphate salt salt, polyol Shi and phosphoric acid ester salt type such as ethylene phenyl ether phosphoric acid salts. Moreover, “Emar TD”, “Emar 20T”, “Neopelex G-25” manufactured by Kao Corporation, “Sandet ALH” manufactured by Sanyo Kasei Kogyo Co., Ltd., and the like are listed as commercial products.

  Examples of amphoteric surfactants include betaine types such as alkyldimethylaminoacetic acid betaines and alkylimidazolinium betaines, and amine oxide types such as lauryldimethylamine oxide. In addition, examples of commercially available products include “Amphitor 24B” and “Amphitol 20YB” manufactured by Kao Corporation and “Amogen AOL” manufactured by Daiichi Kogyo Seiyaku Co., Ltd.

  The content of the surfactant is preferably 0.2 to 5% by mass and more preferably 0.3 to 3% by mass in 100% by mass of the abrasive composition. When the content of the surfactant is within the above range, the emulsifiability of the hydrocarbon solvent becomes good, and the storage stability of the abrasive composition can be maintained well. If the content of the surfactant is less than 0.2%, the storage stability of the abrasive composition tends to decrease, and if it exceeds 5% by mass, the resin forming the coating film may swell or dissolve. .

(Thickener)
The thickener is used for the purpose of improving the handleability of the abrasive composition. The thickener is not particularly limited, and examples thereof include cellulose thickeners such as methylcellulose, crystalline cellulose, starches, cellulose derivatives, xanthan gum, and alkali thickening acrylic polymers as water-soluble synthetic polymer thickeners. It is done. These thickeners may be used alone or in combination of two or more.

An alkali thickening acrylic polymer is particularly preferably used as the thickening agent. Alkali-thickening acrylic polymers can be used in combination with an appropriate alkali agent to give the abrasive composition the necessary viscosity. The dispersion stability of the abrasive composition and the stability of the emulsion Can be improved. Moreover, polishing workability | operativity can be favorably maintained by using an alkali thickening type acrylic polymer.
Examples of the alkali-thickening acrylic polymer include “Primal TT-935”, “Primal TT-615”, “Primal DR-72”, “Primal DR-1” manufactured by Rohm and Haas Japan, and BF Goodrich. “Carbopol 981”, “Carbopol 934”, and the like.

  0.1-5 mass% is preferable in 100 mass% of abrasive | polishing agents composition, and, as for content of a thickener, 0.3-3 mass% is more preferable. If content of a thickener is in the said range, moderate viscosity can be provided to an abrasive | polishing agent composition, and favorable grinding | polishing workability | operativity will be obtained. When the content of the thickener is less than 0.1% by mass, it is difficult to obtain an appropriate viscosity, and scattering during the polishing operation tends to occur. When the content exceeds 5% by mass, the load during the operation is large. The working efficiency tends to decrease.

Alkaline agents used in combination with the above thickeners are not particularly limited, but alkanolamines such as monoethanolamine, diethanolamine, triethanolamine, isopropanolamine, diisopropanolamine, triisopropanolamine, methyldiethanolamine, and ethyldiethanolamine Is preferably used.
When using an alkali agent, it is preferable to adjust pH of an abrasive | polishing agent composition to 6.0-10.0 with the alkali agent, and it is more preferable to adjust to 7.5-9.5.

(water)
The water content is preferably 25 to 85% by mass and more preferably 30 to 80% by mass in 100% by mass of the abrasive composition.

(Other)
The abrasive composition of the present invention includes various organic solvents, rust preventives, preservatives, pH adjusters, chelating agents, antifreeze agents, dyes, and fragrances as long as the purpose of the present invention is not impaired. Etc. can be blended.

  According to the abrasive composition of the present invention described above, since a specific lubricant, abrasive particles, hydrocarbon solvent, surfactant, thickener and the like are combined, good scratch removability, wiping property, and Repaintability is obtained. Moreover, even if water adheres to the scratched part polished using the abrasive composition of the present invention due to, for example, rain or a car wash, white blurring or polishing scratches can be suppressed. Moreover, even if a coating treatment such as a glass-based coating treatment is performed after polishing, it is possible to suppress the occurrence of a whitening phenomenon during or after the coating treatment, so that it is not necessary to perform a degreasing treatment after polishing, and the work process can be shortened.

[Polishing method]
The polishing method of the present invention is a method for polishing a coated surface using the above-described abrasive composition.
As a specific example of the polishing method, for example, an appropriate amount of the above-mentioned abrasive composition is taken in a buff such as sponge, urethane, wool, etc., and a polisher such as a single action polisher or a double action polisher or a polishing machine such as a sand grinder is used. Examples of the method include polishing the painted surface to remove scratches and adhering dirt, and then performing dry wiping or wet wiping as necessary to remove excess polishing composition. In particular, it is preferable to polish the painted surface using a single action polisher and a double action polisher. Further, if necessary, an appropriate amount of the above-mentioned abrasive composition can be taken on a sponge, cloth or the like and polished by hand.

Polishing of the painted surface is preferably performed before the glass-based coating treatment or the coating treatment according to the glass-based coating treatment. By performing these treatments on the painted surface after polishing, functionality can be imparted to the painted surface.
In the present invention, “coating treatment according to glass-based coating treatment” means a coating agent containing a monomer component that reacts with water in a solvent to form a siloxane bond for the purpose of protecting the painted surface or polishing. Is a process of applying, drying, wiping and the like.

By the way, when polishing with a conventional abrasive composition containing dimethyl silicone oil, if a coating treatment such as a glass-based coating treatment is performed after polishing, a coating with a strong solvent contained in the glass-based coating agent is applied. Whitening may occur during or after the treatment. Therefore, in order to prevent this whitening phenomenon, it is necessary to degrease the painted surface after polishing with a degreasing solvent before performing the coating treatment, and the working efficiency tends to be lowered.
However, with the polishing method of the present invention, the coated surface is polished using the above-described abrasive composition of the present invention, so that the whitening phenomenon can be suppressed even if a coating treatment is performed. Therefore, it is not necessary to perform a degreasing process when performing the coating process, and the work process can be shortened.

  Examples of the coated surface to which the polishing method of the present invention is applied include a resin coating film formed by a paint for coating, a surface of a resin molded product, and the like in an automobile body or a building.

  According to the polishing method of the present invention described above, it is possible to easily remove scratches and attached dirt from the painted surface without discoloring or altering the painted surface or eroding or swelling the resin forming the coating film. Can be removed. It is also effective as a pretreatment for processing that imparts functionality to the painted surface, such as glass-based coating treatment.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples.

[Example 1]
<Preparation of abrasive composition>
In a 1000 mL mixing container, 100 g of hydrocarbon solvent “Exsol D80” (trade name, manufactured by ExxonMobil), 60 g of “Exsol D110” (trade name, manufactured by ExxonMobil), “Smoyl P-60” (Product) Name, manufactured by Matsumura Sekiyu Co., Ltd.) 10 g, nonionic surfactant “Leodol TW-L120” (trade name, manufactured by Kao) 5 g, “S-FACE O-601P” (trade name, manufactured by Sakamoto Pharmaceutical Co., Ltd.) 5 g was charged and heated to 60 to 70 ° C. and mixed with stirring. While gradually adding 200 g of hot water at about 60 ° C. to this, the mixture was stirred and mixed with a strong shearing force to obtain an emulsion.
In a separate 1000 mL mixing container, 200 g of water and “alumina A-50N” as abrasive particles (trade name, manufactured by Nippon Light Metal Co., Ltd., α-crystal particle size: 0.3 μm, average particle size: 1.2 μm) ) 150 g, 5 g of “DY33-440F” (trade name, manufactured by Toray Dow Corning Co.) as a lubricant, and 0 g of “triethanolamine” as an alkaline agent were stirred and mixed to obtain a dispersion. The emulsified liquid is added to this dispersion, and after stirring and mixing, 10 g of “Primal TT-615” (trade name, manufactured by Rohm and Haas) as a thickener, “RHODOPOL23” (trade name, manufactured by Rhône-Poulenc) ) 10 g and the remaining water were added to obtain an abrasive composition having a total amount of 1000 g. The polishing composition had a pH of 7.0. Table 1 shows the blending amount (parts by mass) of each component in the abrasive composition and the pH of the abrasive composition.
In addition, the α-crystal particle diameter of the abrasive particles was determined by observation with a scanning electron microscope (“S-2400” manufactured by Hitachi, Ltd.). On the other hand, the average particle size of the abrasive particles was determined by measurement with a laser diffraction / scattering particle size distribution analyzer (“LA-920” manufactured by Horiba, Ltd.).

<Evaluation>
The obtained abrasive | polishing agent composition was evaluated with the following method. The evaluation results are shown in Table 1.
(1) Evaluation of removability of paper eye Using a substrate coated with clear urethane coating (manufactured by PPG) as a coating plate for evaluation test, the following treatments (i) to (iv) are performed in order. The removability was evaluated.
(I) The coated surface of the evaluation test coating plate is polished with # 3000 paper.
(Ii) 1 g of the abrasive composition is applied to an electric single action polisher using a short-hair wool buff and polished for 10 seconds.
(Iii) Thereafter, 1 g of the abrasive composition is applied to an electric double action polisher using a urethane sponge buff and polished for 10 seconds.
(Iv) After the excess abrasive composition was wiped dry with a waste cloth, it was degreased and washed with n-hexane, the state of the painted surface of the evaluation test coating plate was visually observed, and evaluated according to the following evaluation criteria.
○: The scratches on the paper eyes disappeared.
X: Scratches on paper eyes remain.

(2) Evaluation of white blurring property After evaluating the removability of the paper eye of (1), the presence or absence of white blurring on the coated surface was visually observed and evaluated according to the following evaluation criteria. In addition, white blurring is observed so that a coating surface may become glaring if scratches are caused by the abrasive composition or the buff used during polishing.
○: No glare.
X: There is glare.

(3) Evaluation of wiping property When the removal property of the paper eye of (1) was evaluated, the wiping property when the excess abrasive composition was wiped dry with a waste was evaluated according to the following evaluation criteria.
○: There is no catch and it can be wiped off smoothly.
Δ: Slightly caught but can be wiped off.
X: There is a catch and it is hard to wipe off.

(4) Evaluation of repaintability In the evaluation of the removability of the paper eye in (1), the urethane paint was applied by spraying and dried without performing degreasing washing with n-hexane in the treatment (iv). Thereafter, a paint peeling test was conducted.
In the paint peeling test, a cross-cut test was performed in accordance with JIS B-7753, and the number of remaining sheets was represented by numbers.

(5) Whitening property after glass-based coating treatment In the evaluation of the removability of the paper eye in (1), the glass-based coating agent G′ZOX is not formed on the degreasing cleaning with n-hexane in the treatment (iv). (Product name, manufactured by Soft 99) was coated on the painted surface using another sponge buff according to the method of using the product. After standing for 3 hours, the state of the coating plate for evaluation test was visually observed and evaluated according to the following evaluation criteria.
○: No whitening.
X: There is whitening.

[Examples 2-6, Comparative Examples 1-5]
Carried out in the same manner as in Example 1 except that the blends of hydrocarbon solvent, surfactant, abrasive particles, lubricant, alkali agent, thickener and water were changed as shown in Tables 1 and 2, respectively. The abrasive | polishing agent composition of Examples 2-6 and Comparative Examples 1-5 was obtained. The obtained abrasive composition was evaluated in the same manner as in Example 1. Tables 1 and 2 show the pH and evaluation results of the abrasive composition.

Abbreviations in Table 1 and Table 2 represent the following.
“Exor D80”: manufactured by ExxonMobil,
“Exor D110”: manufactured by ExxonMobil,
“Smoyl P-60”: Made by Matsumura Oil Co., Ltd.
“Leodoll TW-L120”: Kao Corporation
“S-FACE O-1001P” manufactured by Sakamoto Pharmaceutical Co., Ltd.
“S-FACE O-601P”: Sakamoto Pharmaceutical Co., Ltd.
“Alumina A-50N”: α-crystal particle size: 0.3 μm, average particle size: 1.2 μm, manufactured by Nippon Light Metal Co., Ltd.
“Alumina A-33F”: α-crystal particle diameter: 0.7 μm, average particle diameter: 0.7 μm, manufactured by Nippon Light Metal Co., Ltd.
“Alumina A-32”: α-crystal particle size: 1.0 μm, average particle size: 1.0 μm, manufactured by Nippon Light Metal Co., Ltd.
“Alumina A-31”: α-crystal particle diameter: 4.5 μm, average particle diameter: 5.0 μm, manufactured by Nippon Light Metal Co., Ltd.
“DY33-440F”: silicone elastomer, manufactured by Toray Dow Corning,
"SH200 300CS": Silicone oil, manufactured by Toray Dow Corning,
“Trefill E-508”: Silicone oil impregnated silicone elastomer, manufactured by Toray Dow Corning,
“Primal TT-615”: manufactured by Rohm and Haas Japan,
“Primal DR-72” manufactured by Rohm and Haas Japan,
“RHODOPOL23”: manufactured by Rhône Poulen.

  As is clear from Tables 1 and 2, the abrasives of Examples 1 to 6 containing a specific amount of a hydrocarbon solvent, a surfactant, abrasive particles, a lubricant comprising a silicone elastomer, an alkali agent, a thickener and water. Since the composition was excellent in the removability of the paper eye on the painted surface and the white blurring property, it was excellent in imparting gloss to the painted surface. Moreover, since the abrasive | polishing agent composition of Examples 1-6 is excellent in wiping off, workability | operativity can be improved. Furthermore, since it is excellent also in the repaintability and the whitening property after a glass-type coating process, it becomes possible to abbreviate | omit a degreasing process and can shorten a work process.

In contrast, the abrasive compositions of Comparative Examples 1 and 2 in which silicone oil was blended as a lubricant were inferior in repaintability, and whitening was confirmed after the glass-based coating treatment.
The abrasive compositions of Comparative Example 3 and Comparative Example 4 in which castor oil was blended as a lubricant had poor wiping properties, and whitening after glass-based coating treatment was also observed. In particular, since the abrasive composition of Comparative Example 3 contained abrasive particles having an α-crystal particle diameter of 4.5 μm and an average particle diameter of 5.0 μm, white blur was confirmed.
The abrasive composition of Comparative Example 5 in which a silicone oil-impregnated silicone elastomer was blended as a lubricant showed white blurring, poor repaintability, and whitening after glass-based coating treatment was also confirmed.

  If the abrasive composition of the present invention is used, in finish polishing of painted surfaces such as automobile coating and building coating, the surface of the coated resin is discolored without causing scratches while having good scratch removability, Since it does not change, erode, or swell, it can give a good gloss after finishing. In addition, it is excellent in wiping with a waste cloth after polishing, and the polished scratches are less likely to rise again due to rainfall or car wash. Accordingly, when used for pretreatment of a coating mainly composed of a solvent such as a glass-based coating, it is not necessary to degrease and remove with a solvent, and the process can be simplified.

Claims (5)

  An abrasive composition comprising a lubricant, a surfactant, a thickener and water comprising abrasive particles, a hydrocarbon solvent, and a silicone elastomer (excluding silicone oil-impregnated silicone elastomer).   Abrasive particles 5 to 30% by mass, hydrocarbon solvents 7 to 40% by mass, a lubricant composed of a silicone elastomer (excluding a silicone oil-impregnated silicone elastomer) 0.1 to 10% by mass, a surfactant 0. The abrasive composition according to claim 1, comprising 2 to 5 mass%, a thickener 0.1 to 5 mass% and water 25 to 85 mass%.   The abrasive composition according to claim 1, wherein the abrasive particles are α-alumina having an α-crystal particle diameter of 1 μm or less and an average particle diameter of 0.3 to 3 μm.   A polishing method comprising polishing the coated surface using the single-action polisher and double-action polisher using the abrasive composition according to any one of claims 1 to 3.   The polishing method according to claim 4, wherein the polishing is performed before a glass-based coating treatment or a coating treatment according to the glass-based coating treatment.