JP2006026475A - Retouching method of coating film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a retouching method of a coating film by which suitable and efficient polishing can be performed to the coating film which is easily softened by heat. <P>SOLUTION: In the retouching method of the coating film wherein foreign matter 3 stuck onto a coating film surface after finish of coating is removed and then a part to be retouched 4 is polished to make the coating film flat and smooth, polishing is carried out while cooling the part to be repaired 4. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for repairing a coating film in which dust and the like are removed and repaired after completion of top coating, and more particularly, to a method for repairing a coating film related to polishing used for repair finishing.

  When adhesion of relatively small dust spots is found after the top coat is completed, so-called repair repair is performed.In this repair, the dust coat is removed using a knife or sanding paper, and the surface of the coating film is made flat to some extent. A paste-like abrasive containing fine abrasive grains is applied to the defective portion, and a polishing finish is performed using a polishing sander having a buff.

  However, when polishing is performed using a polishing sander, the temperature of the coating increases to about 50 to 60 ° C. due to frictional heat generated between the compound and the coating, and the coating is softened. Therefore, there is a problem that the polishing work cannot be completed in a short time.

  In particular, clear coatings with improved scratch resistance are designed to be softer than conventional coatings in order to absorb impacts that lead to scratches, so the heat generation phenomenon due to frictional heat is even more pronounced. Thus, there is a problem that the softening of the coating film is further promoted and polishing cannot be performed.

An object of this invention is to provide the coating-film repair method and polishing sander which can perform appropriate and efficient polishing with respect to the coating film which is easy to soften by heat.
In order to achieve the above object, according to the first aspect of the present invention, after removing foreign matter adhering to the coating surface after completion of coating, the coating is smoothed by polishing the repair site. In the repairing method, a coating film repairing method is provided in which polishing is performed while cooling the repaired part using a cooling means during the polishing.

  In order to achieve the above object, according to a second aspect of the present invention, there is provided a polishing sander in which a polishing buff is attached to a disk rotated by an air motor, the working air supplied to the air motor. There is provided a polishing sander having means for guiding the exhaust air to the periphery of the polishing buff and blowing the exhaust air to the repair site.

  In the method for repairing a coating film according to the present invention, polishing is performed while cooling the repaired part using a cooling means, and the polishing sander according to the present invention uses exhaust air of operating air supplied to the air motor around the polishing buff. Therefore, since the exhaust air is blown to the repair site, the temperature rise of the repair site due to frictional heat generated during polishing can be suppressed. Thereby, since softening of the coating film of a repair site | part can be suppressed, appropriate and efficient polishing can be performed also with respect to the coating film which is easy to produce softening by heat.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 is a partially broken front view showing an embodiment of a polishing sander according to the present invention, FIG. 2 is a conceptual diagram showing the procedure of a coating film repairing method according to the present invention, and FIG. 3 is a coating film according to the present invention. It is a figure which shows typically the abrasive | polishing agent with a coolant which can be used with the repair method of this.

  First, the structure of a preferred polishing sander used in this embodiment will be described with reference to FIG. 1. The polishing sander 1 includes an air motor M and an air connection port 12 to which compressed air serving as a drive source is supplied. , A disc-shaped disk pad 13 connected to the output shaft of the air motor of the main body 11, a finishing pad 14 mounted on the disk pad 13, and a finishing pad 14 that are replaceable. Wool buff (polishing cloth) 15.

  The main body 11 includes a gripping portion 16 for an operator to grip the polishing sander, an adjustment screw 17 for adjusting an air flow rate supplied through the air connection port 12, and a compression supplied to the air motor M. Triggers 17 for performing ON / OFF (and flow rate adjustment) of air are provided. The adjusting screw 17 is used to adjust the entire air flow rate of the compressed air supplied to the work place with respect to the polishing sander 1, whereas the trigger 17 is used by the operator when performing work. The rotation state of the buff is adjusted by grasping and releasing.

  The main body 11 is formed with an exhaust port for driving air supplied to the air motor M. In this example, exhaust ports are formed on both the upper surface and the lower surface of the main body 11. That is, the air exhausted from the air motor M is exhausted from the upper surface of the main body 11 by the exhaust air adjusting ring 18 provided on the upper surface of the main body 11 and the exhaust air adjusting ring 19 provided on the lower surface of the main body 11. It is possible to exhaust from the lower surface or from both. Therefore, the exhaust air adjustment rings 18 and 19 are configured to be able to adjust the flow rate of air exhausted from each.

  The air exhausted from the lower surface of the main body 11 by the exhaust air adjusting ring 19 is guided to an air guide cup 20 attached to the lower surface of the main body 11 and blown around the disk pad 13, the finishing pad 14 and the wool buff 15. . That is, if the exhaust air adjusting ring 19 is set so that air is also exhausted from the lower surface of the main body 11, the compressed air is generated around the buff 15 whenever the trigger 17 is held and the buff 15 is driven to rotate. It will be sprayed and the surrounding coating film can be cooled.

  Next, using the polishing sander 1 described above with reference to FIG. 1, as shown in FIG. 1A, the procedure for repairing the coating film in which the garbage 3 is adhered to the surface of the top coating film 2 will be described. To do.

  First, the dust 3 is removed using a knife or # 1500 to # 2500 sanding paper as shown in FIG. As a result, the garbage 3 is removed, but at the same time, a scar of the knife mark or the sanding paper mark remains in the repair portion 4.

  Polishing is performed using the above-described polishing sander 1 including the repaired portion 4 with the scratches and the periphery thereof. In this polishing, a paste-like abrasive containing fine abrasive particles is applied to the repair part 4 or the wool buff 15 of the polishing sander 1, and the trigger 17 is grasped while grasping the grasping part 16, so that the wool buff 15 is appropriately rotated. As shown in FIG. 3C, it is pressed evenly on the repair portion 4 and its surroundings. FIG. 4D is an enlarged view of the repaired portion 4, but the wool buff 15 rotates while the fine abrasive particles 5 are interposed between the wool buff 15 and the repaired portion 4. Flattened.

  In particular, in this example, during the polishing shown in FIG. 5C, the exhaust air adjusting rings 18 and 19 of the polishing sander 1 are adjusted, and the air is discharged from the air motor M to the repair portion 4 through the air guide cup 20. Compressed air should be blown. Thereby, even if it tries to raise the temperature of the repair part 4 by the frictional heat between the wool buff 15 and the repair part 4, this can be suppressed, and the softening of the coating film of the repair part 4 can be suppressed. As a result, appropriate and efficient polishing can be performed even for a coating film that is easily softened by heat.

  The method for repairing a coating film according to the present invention can be variously modified in addition to cooling the repaired portion 4 with gas using the polishing sander 1 described above.

  For example, when polishing is performed using the above-described polishing sander 1 or an ordinary polishing sander without the air guide cup 20, a paste-like abrasive added with an endothermic material is used. An example of such an abrasive is schematically shown in FIGS. FIG. 4A shows a state before polishing, and FIG. 4B shows a state during polishing. The abrasive 6 contains an appropriate amount of an endothermic material 8 coated with a material such as microgel 7 in addition to the fine abrasive particles 5, and the abrasive 5 breaks the microgel 7 due to external stress during polishing. The endothermic material 8 and the solvent of the abrasive 6 undergo an endothermic reaction to suppress the temperature rise of the repaired part 4 of the coating film.

Since water is used as a solvent for the general abrasive 6, the endothermic material 8 has an endothermic reaction with water, does not adversely affect the coating film and the abrasive particles 5, and further adversely affects the working environment such as ammonia. Any gas that does not generate the gas to be applied can be used. As an example, NH ₄ NO ₃ , NH ₄ Cl, Ba (NO ₃ ) _{2 and the} like can be fried.

  When polishing is performed using the abrasive 6 including the endothermic material 8, even if the temperature of the repair portion 4 is increased due to frictional heat between the wool buff 15 and the repair portion 4, this can be suppressed. Softening of the coating film 4 can be suppressed. As a result, appropriate and efficient polishing can be performed even for a coating film that is easily softened by heat. In particular, when used in combination with the polishing sander 1 shown in FIG.

  Further, polishing may be performed in a state where the heat-absorbing sheet is pasted around the repair portion 4 and in a range that does not interfere with the polishing work. This state is indicated by a dotted line (reference numeral 21) in FIG. An example of the endothermic sheet is one in which moisture contained in the gel absorbs heat and diverges.

  When polishing is performed with such an endothermic sheet 21 attached to the periphery of the repair portion 4, even if the temperature of the repair portion 4 increases due to frictional heat between the wool buff 15 and the repair portion 4, this can be suppressed. It is possible to suppress the softening of the coating film of the repair portion 4. As a result, appropriate and efficient polishing can be performed even for a coating film that is easily softened by heat. In particular, when used in combination with the polishing sander 1 and the abrasive 6 containing the endothermic material 8 shown in FIG.

  The present invention will now be described with reference to specific examples.

  As a coating film to be repaired, a coating with improved scratch resistance (self-healing clear # 200 manufactured by Sumitomo 3M Co., Ltd.) is applied on a steel plate at a film pressure of 30 to 35 μm, and this is cured to repair part 4 And sanded with # 2500 sanding paper so as to correspond.

  Finishing compound PN13084 manufactured by Sumitomo 3M was used as the abrasive 6 and SBS hard wool buff 5728 manufactured by Sumitomo 3M was used as the wool buff 15.

<Example 1> An endothermic sheet (Hotsama sheet manufactured by Kobayashi Pharmaceutical Co., Ltd.) is pasted around the repaired part and the coating film temperature is cooled to 10 to 20 ° C. In this state, the abrasive 6 and the wool buff 15 described above are used. The repair part 4 was polished by using. As a result, there was no feeling that the coating film was entangled with the wool buff, and polishing could be continued.

<Example 2> When polishing was performed while blowing compressed air of about ^{2 to} 4 kg / cm <2> to the repaired part 4 using the polishing sander 1 shown in FIG. It was possible to carry out.

<Example 3> A mixture of ammonium nitrate and urea (Hyeron Super manufactured by Lotte Electronics Co., Ltd.) as an endothermic material was added to the polishing agent 6 at a rate of 1 g with respect to 10 g of the polishing agent, and this was used as a polishing agent for polishing. However, there was no feeling that the coating film was entangled with the wool buff, and polishing could be continued.

<Comparative Example 1> When the repaired portion 4 is polished only with the abrasive 6 and the wool buff 15, the coating surface temperature rises to 50-60 ° C. in 10 seconds after the start, and the coating becomes soft and becomes a wool buff 15. I felt tangled. Polishing was continued in this state, but the scratches on the repairing part 4 disappeared, and new scratches due to polishing entered.

  The embodiment described above is described for facilitating the understanding of the present invention, and is not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

It is the partially broken front view which shows one Embodiment of the polishing sander which concerns on this invention. It is a conceptual diagram which shows the procedure of the repair method of the coating film which concerns on this invention. It is a figure which shows typically the abrasive | polishing agent with a coolant which can be used with the repair method of the coating film which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Polishing sander 11 ... Main body 12 ... Air connection port 13 ... Disc pad 14 ... Finishing pad 15 ... Wool buff 16 ... Gripping part 17 ... Trigger 18, 19 ... Exhaust air adjustment ring 20 ... Air guide cup 2 ... Coating film 3 ... Garbage (foreign matter)
4 ... repair part 5 ... abrasive particle 6 ... abrasive 7 ... microgel 8 ... endothermic material

Claims (7)

In the coating film repairing method, after removing the foreign matter adhering to the coating surface after completion of the coating and polishing the repaired part to smooth the coating film, the repairing part is cooled using a cooling means during the polishing. A method of repairing a coating film characterized by polishing while cooling. The method for repairing a coating film according to claim 1, wherein the cooling means is a gas that does not chemically react with the coating film. The method for repairing a coating film according to claim 2, wherein the gas is general-purpose work air supplied to a repair work place. 4. The method of repairing a coating film according to claim 3, wherein the air is air for operating a polishing sander used in polishing. The method for repairing a coating film according to claim 1, wherein the cooling means is an endothermic material added to an abrasive used in the polishing. The method for repairing a coating film according to claim 1, wherein the cooling means is an endothermic sheet attached to the periphery of the repair site. A polishing sander in which a polishing buff is mounted on a disk rotated by an air motor, and means for guiding exhaust air of operating air supplied to the air motor to the periphery of the polishing buff and blowing the exhaust air to a repair site A polishing sander characterized by comprising:

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