JP5188016B2 - Body panel repair method - Google Patents

Description

  The present invention relates to a method for repairing damage caused on a panel surface of various vehicles such as automobiles and trains. In particular, the curing time of the surfacer can be greatly shortened so that the repair work can be performed quickly, and the cured surfacer can be repaired. The present invention relates to a vehicle repair method capable of eliminating stickiness on a surface.

  When repairing a damaged outer panel of a vehicle, the old paint film is usually peeled off at the damaged location and removed as much as possible by knocking it out, and then putty is put on the location with a spatula or the like. The primer surfacer (or surfacer) is then applied and dried, and then the top coat is applied.

  In particular, the process using putty treatment and primer surfacer (surfacer) requires time for curing, and after curing, the coated surface needs to be polished smoothly for each coating in order to obtain a good surface condition. For this reason, a great deal of time and labor are required in these processes.

  And the surfacer used in the above repair work is used to erase the paper eyes and small burrows, improve the adhesion of the paint, suppress the suction of color and improve the finish of the paint If the surfacer is omitted, the painted paint will be sucked into the putty and cause gloss to be dismissed, so it plays an extremely important role in a series of repair work. It is difficult to omit this.

  Conventionally, as such surfacers, one-component ones called lacquer surfacers and two-component ones that are cured using a curing agent have been provided. In US Pat. No. 5,637, it has been proposed to use a one-component ultraviolet curable or visible light curable surfacer for the purpose of reducing the curing time.

  For example, a repair method using an ultraviolet curable surfacer is disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 2000-70845). In this document, an ultraviolet polymerizable composition is used as a putty and a primer surfacer. In addition, it is described that the time required for repairing the painted surface of the vehicle can be shortened by curing it with ultraviolet rays.

Further, a repair method using a visible light curable surfacer is disclosed in Patent Document 2 (Japanese Patent Application Laid-Open No. 2002-167526). This document includes a photopolymerization initiator having photosensitivity in the visible light region. Is used to reduce the work process time by irradiating and curing light having a wavelength in the range of 380 to 450 nm of 20 mw / cm ² or more. Yes.
JP 2000-70845 A JP 2002-167526 A

  As described above, a repair method using a visible light curable surfacer has been proposed. However, even if such a visible light curable surfacer is cured by irradiating the corresponding emission spectrum, the surface of the surfacer becomes sticky (tackiness), causing problems in the subsequent work. .

  In other words, after applying the surfacer, it is often done to dry well before applying the paint, and then sharpen with 320-1000 water-resistant paper to remove rough abrasive scratches and flatten the painted surface. When using a visible light curable surfacer as described above, the surface becomes sticky (tackiness), and even if it is sharpened with paper, the paper becomes clogged. There was a big problem.

  Therefore, the present invention provides a method for repairing a vehicle body panel that solves such a conventional problem and does not cause a sticky feeling (tackiness) at the time of curing even when a visible light curable surfacer is used. .

  In addition, in the case of a visible light curing type surfacer, it is common knowledge to cure by irradiating light in the visible wavelength region, but the curing time in such a curing method usually requires about 3 minutes. It has become.

  In view of this, the present invention provides a method for repairing a vehicle body panel that can reverse such conventional common sense and can further accelerate the curing time of a visible light curable surfacer.

  As a result of intensive studies to solve the above-mentioned problems, the inventors of the present invention irradiate visible light curable surfacers with light in the visible light wavelength region and further add light in the ultraviolet region and / or heat. As a result, the inventors have found a method for repairing a vehicle body panel that significantly shortens the curing time and does not cause a sticky feeling (tack feeling) during curing, and has completed the present invention.

  That is, the method for repairing a vehicle body panel according to the present invention is a method for repairing a panel surface of a damaged vehicle body, and the repair method involves applying a surfacer and curing the surfacer before applying a paint. The surfacer application / curing step includes a step of applying a surfacer containing a photopolymerization initiator having an absorption spectrum in the visible light wavelength region to the region where the paint is applied, and applying this to the emission spectrum of the visible light region. It is characterized by being cured by heating to 50 ° C. or higher using a lamp having

  The visible light polymerization type surfacer is generally produced by containing a polymerizable unsaturated group-containing resin, a polymerizable unsaturated compound, a filler, and a visible light polymerization initiator, and a visible light polymerization initiator. Are used that are excited by light energy in the region of 380 to 780 nm. As such a visible light polymerization initiator having photosensitivity in the visible light region, for example, Yamaoka et al., “Surface”, 27 (7), 548 (1989), Sato et al., “Summary of the 3rd Polymer Material Forum” 1B, page 18 (1994), such as camphorquinone, benzyl, trimethylbenzoyldiphenylphosphine oxide, methylthioxanthone, bispentadienyltitanium-di (pentafluorophenyl) alone, Other than organic peroxide catalyst / dye system, diphenyliodonium salt / dye, biimidazole / keto compound, hexaarylbimidazole compound / hydrogen donating compound, mercaptobenzothiazole / thiopyrylium salt, metal arene / cyanine dye Hexaaryl biimi described in Japanese Patent Publication No. 45-37377 Mention may be made of known complex initiator systems such as dazole / radical generators.

  Furthermore, examples of visible light polymerization initiators excited by light energy in the 400 to 700 nm region include camphorquinone, benzyl, α-naphthyl, 4,4′-dimethoxybenzyl, 2,4,6-trimethylbenzoyl, 2- Methylthioxanthone, 2,4-diethylthioxanthone, 2-chlorothioxanthone, anthraquinone, 3-ketocoumarin, diphenylphosphine oxide, acylphosphine oxide, dimethylaminobenzophenone, 10-butyl-2-chloroacridone, fluorenone, organic dye sensitizer Etc. In addition to these, known initiator systems include ionic dye-counter ion compound systems such as cationic dye-borate anion compounds (for example, JP-A-1-60606, JP-A-2-11607), metal arene compounds And organic dye systems (for example, JP-A-4-363308, JP-A-5-17525) and the like.

  As a surfacer using such a visible light polymerization initiator, a commercially available one can be used, and examples of such a surfacer include a trade name: Rock Light Cure Surfacer manufactured by Rock Paint Co., Ltd. And a photo-cured OPT (Opt) surfacer manufactured by Kansai Paint Co., Ltd., and the like.

  And in the repair method which concerns on this invention, while having irradiated the light which has a wavelength of visible region, and heating the apply | coated surfacer, the stickiness (tack feeling) of the surface after hardening can be eliminated. Thereby, the working efficiency of the subsequent polishing process of the surfacer can be greatly improved.

  When curing the surfacer, in addition to heating with a lamp having an emission spectrum in the visible light region, the surfacer may be heated with or without visible light using a heating means different from this lamp. it can. However, as described later, in order to shorten the curing time, it is desirable to heat with a lamp having an emission spectrum in the visible light region.

  In particular, when heating the coated surfacer, it is necessary to heat at 50 ° C. or higher, preferably 60 ° C. or higher, particularly preferably 70 ° C. or higher. In this case, if the heating temperature is less than 50 ° C., the sticky feeling (tack feeling) on the surface of the hardened surfacer cannot be removed, and the working efficiency cannot be improved.

  Moreover, in this invention, the repair method of the vehicle body panel which solved the said subject by irradiating the light of a wavelength range other than that besides the light of a visible light wavelength range is provided.

  That is, a method for repairing a damaged vehicle panel surface, the repair method including a surfacer coating / curing step of applying a surfacer and curing the surfacer prior to application of the paint, the surfacer coating / curing step Applies a surfacer containing a photopolymerization initiator having an absorption spectrum in the visible light wavelength region to the region where the paint is applied, and has a maximum emission spectrum in the wavelength region of 350 to 400 nm. A repair method for a vehicle body panel, characterized by irradiating and curing light having an emission spectrum in a wavelength region of less than 350 nm.

  Here, the general visible light polymerization reaction means that the visible light polymerization initiator is excited to become a radical by irradiating light having a wavelength that matches the absorption wavelength of the visible light polymerization initiator used. This is a reaction in which the double bond portion is activated and approaches one after another by approaching the polymerizable double bond (unsaturated group) of the prepolymer and monomer. Therefore, it is common sense to use an irradiator having an emission spectrum in the visible light region as long as it is a resin composition using a visible light curable polymerization initiator. In this regard, in the present invention, by irradiating light from an ultraviolet irradiator, the curing time was significantly shortened and the problem of stickiness (tackiness) on the surface after curing was successfully solved. .

  An irradiator that can be used to cure such a visible light curable surfacer is a metal halide lamp in which a metal is added in the form of a halide in addition to mercury in an arc tube, with a main axis of 365 nm. It is desirable to be able to emit an ultraviolet spectrum with a wavelength of 200 to 400 nm. In particular, in order to increase the curing speed of the surfacer, a metal halide lamp having an output of 1.0 kW or more, preferably 1.2 kW or more is used as a light source. The UV irradiation machine that was used is desirable.

  Hereinafter, embodiments of a vehicle body panel repair method according to the present invention will be described with reference to the drawings.

  FIG. 1 is a process diagram showing an example of a repair method according to the present invention, and FIGS. 2 and 3 show an ultraviolet irradiator 8 that can be suitably used for curing the surfacer 11 in the repair method according to the present embodiment. The spectral distribution is shown.

  This repair method will be described in detail with reference to FIG. 1. FIG. 1 (A) is a cross-sectional view of a recessed portion 2 of a vehicle body panel 1 that has been recessed due to damage. The state in which the depression 2 is generated is shown. In order to repair the dent 2, first, pretreatment such as degreasing of the old paint film 3 and removal of the old paint film 3 is performed, and then the feather edge is removed as shown in FIG. 1 (B). I do. The work of removing the feather edge can be performed with a sander 5 using paper of about # 120 to # 400. At that time, it is generally desirable to adjust the angle of the feather edge (angle formed with the steel plate 4) to 27 to 54 degrees. After removing the feather edge, the removed portion of the old paint film 3 and its periphery are cleaned by air blow or the like, and degreased with a waste cloth soaked with silicon off or the like.

  Next, in order to make the dent 2 subjected to the above pretreatment as shallow as possible, a panel drawer 6 (an instrument generally referred to as a puller) is used as shown in FIG. Pull out. After that, as shown in FIG. 1D, a putty 10 is embedded and cured. As the putty 10 that can be used here, various conventionally provided putty materials can be used. For example, a two-pack type putty material that hardens a resin using a curing agent, or UV polymerization starts. A photopolymerization type putty material formed by blending an agent or a visible light polymerization initiator can be used. The curing method for the embedded putty 10 is performed according to a method defined for each putty material.

  The part of the cured putty 10 that is raised from the old paint film 3 is flush with the old paint film 3 surface by using a double action sander, orbital sander 7, etc. as shown in FIG. Grind until the bottom of the body panel 1 is removed.

  Next, after masking the periphery with masking paper as necessary, as shown in FIG. 1 (F), the exposed surface of the putty 10, the exposed surface of the putty 10 and the boundary peripheral portion of the old coating film 3, As shown in FIG. 1 (G), the visible light curing type surfacer 11 is spray-applied, and the visible light polymerization type surfacer 11 is irradiated with light from the ultraviolet irradiator 8, and the surfacer 11 is applied. Harden.

  In particular, the irradiator 8 is preferably an ultraviolet irradiator 8 using a metal halide lamp having an output of 1.2 kw, which shows a relative spectral energy as shown in FIG. In addition, it is a metal halide lamp in which a metal is added in the form of a halide in addition to mercury in an arc tube, and emits an ultraviolet spectrum having a wavelength of 200 to 400 nm with a main axis of 365 nm as shown in FIG. Whatever is possible can be used. Note that the solid line in FIG. 3 is a standard type, and the chain line is a halogen-less type.

  In this embodiment, an ultraviolet irradiator 8 of 1.2 kw output using a metal halide lamp is used, and this is a light beam when irradiated at a distance of 12.5 cm ± 5 cm (distance from the surfacer 11). Since it can also be heated to 50 ° C. or more together with the irradiation, no heat treatment is performed. At the same time, if the irradiator used to cure the surfacer 11 is another irradiator conventionally used to cure the visible light curable resin, the surface tackiness after curing will be reduced. In order to eliminate this, it is desirable that heating be performed at the same time as the light irradiation or separately with a panel heater after the light irradiation.

  And the application | coating process of the surfacer 11 shown to the said FIG.1 (F), and the hardening process of the apply | coated surfacer 11 shown in FIG.1 (G) can be repeatedly performed until a required film thickness is obtained, Is repeated until a film thickness of about 50 μm to 80 μm is obtained. However, the surfacer 11 film formed here is at most 1 mm.

  By performing the application / curing step of the surfacer 11 as shown in FIGS. 1 (F) and 1 (G), the surfacer 11 can be rapidly cured, and the tackiness of the surface after curing can be eliminated. .

  Thereafter, the surface of the hardened surfacer 11 is first polished with # 400 paper using a double action sander, orbital sander 7, etc., and then polished with # 600 to 800 paper as shown in FIG. 1 (H). To do. At the time of this polishing, the surface of the surfacer 11 formed by the above-described process is free from clogging of the paper because the stickiness on the surface is eliminated, and the polishing operation can be performed efficiently. After this polishing operation, it is also possible to confirm the presence or absence of distortion using a strain relief spray. If distortion is found, the application and curing process of the surfacer 11 is repeated again. If no is found, the distortion removing spray is wiped off and the process proceeds to the top coating process.

  In the top coating process, first, after washing and degreasing, the top coating 12 is performed by a general method as shown in FIG. 1 (I), and polishing is performed to finish the depression 2 generated in the vehicle body panel 1. Can be repaired.

  In the following, in order to confirm the effect of the repair method shown in FIG. 1, the curing time of the visible light curable surfacer and the tackiness (stickiness) of the surface after curing were evaluated.

The environment in which the following experimental example was performed was 750 to 800 lux in brightness, an air temperature of 29 ° C., and a humidity of 66%.
[Experimental Example 1]

First, a visible light curable surfacer (trade name: Rocklight Cure Surfacer) manufactured by Rock Paint Co., Ltd. was diluted to 50% (volume ratio) and applied to a steel plate to prepare a test piece. This application is performed with a spray gun having a spray port having a diameter of 1.3 mm, the discharge amount is adjusted to about 140 ml / min, and the air pressure is set to 0.8 kgf / cm ^{2 to} 1.0 kgf / cm ^2. The distance was set to about 10 cm and spray coating was performed. Specimens, application area of the surfacer creates two kinds of things and 4 dm ² that of 1 dm ^2.

  After the surfacer was applied, each test piece was immediately irradiated with light from an ultraviolet irradiator to cure the applied surfacer. The irradiator used in this experimental example is a 1.2 kW ultraviolet irradiator in which a metal halide lamp is used as a light source and the spectral energy shown in FIG. 2 is relatively shown.

And in each test piece, the curing time of the surfacer is measured, the distance between the surfacer and the ultraviolet irradiation machine is adjusted within a range of 12.5 cm ± 5 cm, the heating temperature for the surfacer is adjusted, and the state after curing, in particular The tackiness (stickiness) on the surface after curing was evaluated. The evaluation results are shown in Table 1.
[Experimental example 2]

As in Example 1, two types of test pieces with different coating areas were prepared, and an ultraviolet irradiation machine was used for a visible light curing surfacer (artificial solar lighting manufactured by Celic: model “SOLAX-EVO II”). Instead, the time until the surfacer in each test piece was cured was measured. The curing time, the temperature on the surface of the surfacer, and the state after curing, in particular, the tackiness of the surface after curing (sticky feeling) were evaluated, and the results are shown in Table 2.
[Experimental Example 3]

When the surfacer was cured, the panel heater was used to irradiate light from the irradiator used in Experimental Example 2. The results are shown in Table 3.

As is apparent from the above results, the visible light curable surfacer can be rapidly cured by using an ultraviolet irradiator. Specifically, as is clear from the results of Experimental Example 1, the test piece having a surfacer coating area of 1 dm ² was cured in 25 seconds, 30 seconds, and 35 seconds, and the surfacer coating area was 4 dm ² . The pieces were cured in 60 seconds, 80 seconds, and 90 seconds. Further, as shown in Experimental Example 3, by applying heat at the time of curing, the tackiness of the surface after curing can be eliminated.

  Note that the vehicle body panel repair method of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention.

Process drawing showing repair method according to the present embodiment The spectral energy distribution figure about the irradiation light of the ultraviolet irradiation device used in this Embodiment. The spectral energy distribution figure about the irradiation light of another ultraviolet irradiation device.

Explanation of symbols

1 Body panel
2 Indentation
3 Old paint film
4 Steel plate
5 Sanders and other polishing tools
6 Panel drawer
7 Orbital Thunder
8 UV irradiation machine
10 Putty
11 Surfacer
12 Paint

Claims (3)

A method of repairing a panel surface of a damaged vehicle,
The repair method includes a surfacer application / curing step in which a surfacer is applied and cured prior to the application of the paint,
In the surfacer coating / curing step, a surfacer containing a photopolymerization initiator excited by light energy in a 400 to 700 nm region having an absorption spectrum in the visible light wavelength region is applied to the region where the paint is applied. Is cured using a lamp having an emission spectrum in the visible light region, and at the same time as the light irradiation by the lamp, or after the light irradiation , using a heating means different from the lamp , A method for repairing a vehicle body panel, characterized by eliminating the tackiness of the surface after curing by heating to above ℃.
The method for repairing a vehicle body panel according to claim 1, wherein the applied surfacer is heated to 70 degrees or more.

It said heating means is a panel heater, method of repairing a vehicle body panel according to claim 1 or 2.