Classifications

• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
  • C09K3/00—Materials not provided for elsewhere
  • C09K3/14—Anti-slip materials; Abrasives
  • C09K3/1454—Abrasive powders, suspensions and pastes for polishing
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09G—POLISHING COMPOSITIONS; SKI WAXES
  • C09G1/00—Polishing compositions
  • C09G1/02—Polishing compositions containing abrasives or grinding agents

Definitions

• the present invention relates to an abrasive composition, and particularly relates to an abrasive composition suitable for buff abrading a coated film surface of an automobile.
• An external plate part of a car such as a bonnet and a door that has been damaged from a car accident, etc. may be repaired in a manner which is described in patent document 1.
• a dented portion due to damage is hammered out, a putty is applied on the surface, a primer surfacer is sprayed thereto, to make the surface flat.
• the texture matching is generally carried out by abrading convex parts with water-resistant abrasive paper of #1000 (PlOOO) to #3000 (P3000) so as to make pitch and height of convex-concave on the coated film surface coincident with a circumference portion. Thereafter, buff abrading with a fine compound is conducted so as to remove abrasive traces of the water-resistant abrasive paper, and then texture matching is conducted through buff abrading with a super-fine compound so as to remove buffing traces of the fine compound. Finally, a finishing process is carried out by using ultra-fine compound so as to provide luster. [0007]
• an electric or air driving polisher having a rotation of about 1500 to 3000 rpm is used, and a towel buff, a wool buff, a corduroy buff, a sponge buff and the like are used for a surface to be contact with a coated film surface.
• the liquid compound is dropped on the contact surface of the buff, and a coated film surface is buff-abraded.
• a conventional compound employed for a buff abrading process contains abrasive particles, and oils and fats dissolved in a petroleum solvent, which are emulsified or dispersed in water with a surfactant.
• patent document 2 describes an aqueous abrasive composition which comprises a lubricating oil such as dibasic acid esters and phosphoric acid esters.
• Patent document 3 describes an aqueous abrasive composition which comprises plastic particles.
• Water-proof abrasive paper of #2000 presently has the finest pitch, but forms abrasive traces. So the abrasive traces have to be abraded out with a buff and a compound, but the operation takes labor and time since poor abrasive efficiency due to free particles. Although abrasive cloth-paper provides high abrasive efficiency, abrasive traces becomes rough. In addition, abrasive cloth-paper abrades only a convex portion of an orange peel, and does not abrade a concave portion.
• Patent document l Japanese Patent Kokai Publication No. 123065/1997
• Patent document 2 Japanese Patent Kokai Publication No. 2004- 25323
• Patent document 3 Japanese Patent Kokai Publication No. 2004- 89907
• the present invention solves the above-described conventional problems and the object thereof is to provide an abrasive composition that is excellent in abrasive power, and capable of erasing abrasive traces formed on a coated film in a short period.
• Means for solving problems [0012]
• the present invention provides an abrasive composition which comprises at least water, abrasive particles, a petroleum -based solvent, a surfactant, and a thickener, further comprises 0.1 to 20% by weight of a plasticizer, and the object is achieved thereby.
• An abrasive composition of the present invention is unlikely to disorder convex-concave of an orange peel as being liquid, excellent in abrasive power to be able to erase abrasive traces formed on a coated film in a short period, and a surface after being abraded has excellent smoothness.
• An abrasive composition of the present invention is a water-based composition comprising at least water, abrasive particles, a petroleu ⁇ r based solvent, a surfactant, a thickener and a plasticizer.
• a plasticizer is preferably excellent in swelling and lubricating properties for a coated film. This is because a surface of the coated film is softened to improve abrasive power.
• the plasticizer is found to have a solubility parameter (SP value) of 8.7 to 11, preferably 9 to 10.
• the solubility parameter ( ⁇ i) referred herein is the value calculated from the Small equation. A calculation method is shown on VII/682 to VII/685 of Polymer Handbook Forth Edition. [0017]
• plasticizers examples include acetyltri-n-butyl citrate, acetyltriethyl citrate, triethyl citrate, tributoxy phosphate, dimethyl glutarate, a mixture of dimethyl glutarate, dimethyl adipate and dimethyl succinate, and the like.
• Particularly preferred plasticizers include acetyltri- n-butyl citrate.
• a plasticizer is contained such that the plasticizer concentration of an abrasive composition is from 0.1 to 20% by weight, preferably from 0.5 to 5% by weight.
• the plasticizer concentration in an abrasive composition is less than 0.1% by weight, abrasive efficiency is not sufficiently improved; the concentration exceeding 20% by weight may cause deterioration of the coated film.
• Abrasive particles to be used in the present invention preferably have an average particle diameter ranging from 0.5 to 50 ⁇ m.
• the average particle diameter is preferably from 10 to 50 ⁇ m in a roughly abrading step of buff abrasion and is preferably from about 0.5 to about 10 ⁇ m in a finishing abrading step.
• the average particle diameter of abrasive particles is below 0.5 ⁇ m, abrasive power is too weak; if the average particle diameter exceeds 50 ⁇ m, abrasive scratches become too deep, thereby consuming much time for abrading.
• Hardness of an abrasive material constituting abrasive particles that is used approximately ranges from 3 to 10 in the old Mohs hardness, preferably ranges from 4 to 10. For the old Mohs hardness being less than 3, abrasive power is too weak.
• the abrasives include well known natural abrasives and artificial abrasives.
• Natural abrasives that are suitably used include (sintered) diatomaceous earth, tripoli, (sintered) kaolin, silica powder, and the like; artificial abrasives that are suitably used include alumina abrasives (e.g., a sintered alumina abrasive, a brown alumina abrasive/a white alumina abrasive/a pink alumina abrasive/mono-crystalline fused alumina abrasive, and the like), colloidal silica, synthetic silica, calcium carbonate, stannic oxide, and the like. In the present invention, these abrasives can be used alone or in combination of not less than two kinds. [0021]
• the content of abrasive particles that may be used ranges from 1 to 60% by weight based on 100% by weight of the total abrasive composition. When the content of abrasive particles is less than 1% by weight, abrasive power is too weak; when the content exceeds 60% by weight, finishing is poor and powder scattering in operation is increased. [0022] Petroleum-based solvent
• a petroleum -based solvent stands for an organic solvent obtained by fractional distillation of petroleum.
• Petroleum-based solvents used in the present invention favorably comprise saturated aliphatic hydrocarbons and/or saturated aliphatic cyclic hydrocarbons, having a boiling point of 120 0 C or more, which improve wetness of an abrasive composition for a coated film in order to improve abrasive power of abrasive particles, or possess action such as slightly softening a coated film.
• the boiling point of a petroleum-based solvent is below 12O 0 C, the action of the petroleum -based solvent and the stability of the emulsion cannot be sufficiently obtained on account of too quick drying.
• Examples of such petroleum-based solvent include petroleum -based aliphatic solvents such as kerosine, solvent naphtha, Stoddard solvent; saturated aliphatic hydrocarbons such as nonane, decane and dodecane! terpene -based solvents such as camphor oil, turpentine oil and pine oil; terpenes such as pinene and dipineneJ and the like. These can be used alone or in combination of not less than two kinds. [0024]
• petroleum -based aliphatic solvents such as kerosine, solvent naphtha, Stoddard solvent
• saturated aliphatic hydrocarbons such as nonane, decane and dodecane!
• terpene -based solvents such as camphor oil, turpentine oil and pine oil
• terpenes such as pinene and dipineneJ and the like.
• Aromatic hydrocarbons have an aromatic ring and thus is harmful to a human body, and also odor thereof is strong as well, thereby having a detrimental effect on the environment. Accordingly, no use of aromatic hydrocarbons is preferable.
• a petroleum-based solvent is used in an amount so as to account for
• an abrasive composition dries too quickly to have sufficient abrasive amount. When it exceeds 60% by weight, an abrasive composition slowly dries and remains thick for long time, so it is difficult to notice stop timing for the operations.
• Surfactant decreases interfacial tension between a dispersion phase and a dispersion medium thereof and is a component necessary for dispersing abrasive particles, emulsifying a solvent, or the like.
• the surfactants include soaps made of fatty acids such as oleic acid and stearic acid, polyoxyethylene alkyl ether, and the like.
• a thickener For increasing and controlling viscosity of an abrasive composition, a thickener can be added. Extraordinary low viscosity of an abrasive composition tends to cause the composition to flow down a vertical surface of an automobile, and therefore a workman cannot suitably abrade the automobile using the composition. Hence, a thickener is used for adjusting the viscosity of an abrasive composition.
• Typical examples of the thickener include hydrated aluminum silicate, a dimethyldioctadecyl salt of montmorillonite clay, alkali- soluble acrylic polymer emulsion, colloidal silica, and heavy metal soaps such as lead oleate, zinc oleate, zinc stearate and aluminum stearate.
• Preferred thickeners to be used in the present invention include an aqueous emulsion of alkali-soluble acrylic polymer.
• a thixotropic agent can be used.
• a thixotropic agent is a colloidal solution, and when an outer force is applied thereto, the solution changes from gel to sol to exhibit fluidity. When the sol is allowed to stand, it returns to the original gel again.
• examples of the thixotropic agent include inorganic substances such as anhydrous aluminum silicate, clay and fine mica powder, and organic substances such as fatty acid derivatives and hydrogenated castor oil.
• a stabilizer and a preservative can be employed.
• Typical examples include methylparaben, ethylparaben, propylparaben, butylparaben, potassium sorbate, sorbic acid and o-phenylphenol.
• a pigment, a dye and a flavor can also optionally be added to an abrasive composition of the present invention.
• Blending the above-described components with water can give a abrasive composition of the present invention.
• water that may be used include tap water, distilled water, and deionized water. Deionized water is preferable. This is because ions or other substances are removed therefrom that facilitate growth of microorganisms in an abrasive composition, thereby to cause a low possibility of growing the microorganisms.
• Water is used in an amount so as to account for 10 to 60% by weight, preferably 20 to 40% by weight of an abrasive composition.
• an abrasive composition for instance, a mixture is continuously stirred while adding to water the components such as a surfactant, a thickener, a plasticizer, an additive, a petroleum -based solvent and abrasive particles. Thereafter, the abrasive composition is mixed using a high shear blender until a uniform dispersion is formed.
• a process of finishing a coated film surface of the present invention by first, dusts, coating lumps, coating defects and the like on a surface of a coated film which has been coated with spraying, is removed by using a water-resistant abrasive paper having an abrasive particle size of 5 to 15 ⁇ m (#1000 to #3000 according to JIS R 6001) and water.
• Abrasive traces generated by a water-resistant abrasive paper, an elastic abrasive material and the like, are then erased by using an abrasive composition of the present invention.
• an abrasive composition of the present invention is placed on a hard-type buff such as an wool buff, and a coated film surface, on which abrasive traces have been formed, is abraded therewith.
• Tools for abrading include a single action sander, a single polisher, and the like which are equipped with a hard-type intermediate buff pad.
• polishing is conducted for finish by using a sponge buff and a liquid abrasive composition having an abrasive particle size of about 2 to 3 ⁇ m.
• a plasticizer generally is poor in volatility, so the plasticizer remained in coated film organization may have bad influence on the physical properties of the coated film after being repaired. Therefore, when abrasive traces are erased with an abrasive composition of the present invention, a coated film which have contacted with a plasticizer is preferred to be removed entirely by further conducting polishing as described above.
• a Acetyltri-n-butyl citrate (SP Value'- 9.06)
• b Alumina having an average particle diameter of 20 ⁇ m [0040]
• the resulting abrasive composition was evaluated in abrasive power and finishing abilities.
• the evaluation procedures are as follows.
• SCALLOP DISK #1200 manufactured by 3M Company was applied to "SCALLOP PAD", and they were made to go and back on a coated film surface of the test piece 30 times by hand to form abrasive traces.
• a face element was exchanged to "SEPARATE SOFT SPONGE BUFF 5764" manufactured by 3M Company, an ultrafine particle compound manufactured by 3M Company "HARD 2L” was placed on the coated film surface, and polishing was conducted.
• a face element was exchanged to "SEPARATE SOFT SPONGE BUFF 5764" manufactured by 3M Company, an ultra-fine particle compound manufactured by 3M Company "HARD 2L” was placed on the coated film surface, and polishing was conducted.
• Example 2 An abrasive composition was prepared according to substantially the same manner as described in Example 1 except that content of the plasticizer was 4.76% by weight. Composition of this abrasive composition is shown in Table 2. [0052] [Table 2]
• An abrasive composition was prepared according to substantially the same manner as described in Example 1 except that no plasticizer was employed.
• the composition of this abrasive composition is shown in Table 3. [0056] [Table 3]

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• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Polishing Bodies And Polishing Tools (AREA)
• Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Applications Claiming Priority (2)

Publications (1)

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• 2005
  • 2005-01-14 JP JP2005008000A patent/JP2006193658A/ja active Pending
• 2006
  • 2006-01-12 JP JP2007551359A patent/JP2008527149A/ja not_active Withdrawn
  • 2006-01-12 WO PCT/US2006/001011 patent/WO2006076449A1/en active Application Filing
  • 2006-01-12 CA CA002594786A patent/CA2594786A1/en not_active Abandoned
  • 2006-01-12 EP EP06718124A patent/EP1841832A1/de not_active Withdrawn
  • 2006-01-12 CN CN 200680001743 patent/CN101098944A/zh active Pending

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