JP2015134331A - Repair method for vehicle components - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a repair method for vehicle components capable of improving reliability of adhesion of putty to a damaged part.SOLUTION: In a repair method for vehicle components, a worker performs rough correction for correcting a damaged part DP in a resin component WK to a shape close to its original shape as a first process. Next, the worker performs plasma processing on the damaged part DP as a second process. Concretely, the worker applies voltage to a pair of electrodes 104 in a plasma torch 101 and introduces nitrogen gas into the plasma torch 101 so as to emit plasma F from an irradiation port 103. The worker irradiates the damaged part DP in the resin component WK with the plasma F emitted from the irradiation port 103 of the plasma torch 101. Accordingly, a nitrided layer NL containing nitrogen in a surface layer of the damaged part DP is formed. After that, the worker performs painting on the nitrided layer NL.

Description

  The present invention relates to a method for repairing a vehicle component that repairs a damaged portion formed of a scratch, a crack or a depression generated in a resin component in a vehicle.

  Conventionally, when a resin part in a vehicle, such as a cover part of a door mirror, a bumper, or a cowl of a two-wheeled vehicle, is damaged, such as a scratch, a crack or a depression, the damaged part is repaired. For example, Patent Document 1 described below describes a method for repairing a polypropylene resin portion in which a primer is applied to the surface of a polypropylene resin net placed at a damaged portion, and then a putty is applied to be applied. In this case, the primer is a base agent for enhancing the adhesion between the polypropylene resin and the putty.

JP 2006-103242 A

  However, in the repair method described in Patent Document 1, since the primer itself is also a paint and is applied to the surface of the damaged portion, the reliability of maintaining the adhesion after the putty is applied is low. There is a problem.

  The present invention has been made to cope with the above-described problems, and an object of the present invention is to provide a vehicle part repair method that can improve the reliability of the putty adhesion to a damaged portion.

  In order to achieve the above object, a feature of the present invention is a vehicle part repairing method for repairing a damaged part consisting of a scratch, a crack or a depression generated in a resin part or a resin layer part having a resin layer in a vehicle, The present invention includes a nitride layer generation step for generating a nitride layer containing a nitrogen functional group on the surface of the damaged portion, and a putty application step for applying putty on the surface of the nitride layer. In this case, the resin layer component is a component in which a resin material (for example, paint) is applied to the surface of a material other than the resin material, for example, a metal material.

  According to the feature of the present invention configured as described above, the repair method of the vehicle part is not formed with a primer layer on the surface of the damaged part in the resin part or the resin layer part, but with a nitride layer on the surface layer of the damaged part. Since it forms, the reliability to the adhesiveness of the putty with respect to a damaged part can be improved.

  According to another feature of the present invention, in the repair method for a vehicle component, in the nitride layer generation step, the surface layer of the resin component contains 0.7% or more and 2.2% or less of nitrogen atoms relative to carbon atoms. To be included.

  According to the feature of the present invention configured as described above, the method for repairing a vehicle component is that at least 0.7% or more, preferably 0.7% or more and 2.2% with respect to carbon atoms on the surface layer of the resin component. Adhesion can be improved by including nitrogen atoms of no more than%.

  Another feature of the present invention is that, in the repair method for a vehicle component, the nitride layer generation step performs an atmospheric pressure plasma treatment using nitrogen as a plasma gas on the damaged portion.

  According to the feature of the present invention configured as described above, the repair method for vehicle parts performs the atmospheric pressure plasma treatment on the damaged portion, so that the workability and repair quality of the repair work can be improved. That is, in the conventional repair method, since the coating work is extremely complicated and the construction quality is likely to vary, there is a problem that the workability and the repair quality of the repair work are deteriorated. More specifically, since the primer is generally applied to the damaged portion by spraying with a spray can, it is difficult to apply uniformly to the periphery including the damaged portion, and masking is necessary around the application portion in advance. In addition, when the remaining amount of the primer in the spray can is reduced, there is a problem in that the droplet diameter to be sprayed varies, and so-called yuzu skin tends to occur. However, since the atmospheric pressure plasma treatment, which is a repair method for vehicle parts according to the present invention, only irradiates the damaged portion with the plasma for several seconds, the repair work can be performed easily and with high accuracy.

  Another feature of the present invention is that in the vehicle part repair method, the nitride layer generation step includes 1% or less of carbon dioxide in the plasma gas. In this case, as the plasma gas, in addition to carbon dioxide gas, carbon monoxide gas or nitrogen monoxide gas, that is, a gas gas containing oxygen atoms at room temperature can be widely used.

  According to the feature of the present invention configured as described above, since the vehicle repair method includes 1% or less of carbon dioxide in the plasma gas in the nitriding layer generation step, the plasma gas can be easily activated and the workability can be improved. It becomes good.

  Another feature of the present invention is that the nitride layer has a thickness of 20 nm or less according to the vehicle parts repair method.

  According to the feature of the present invention configured as described above, the repair method of the vehicle parts can perform the work process easily and in a short time because the nitride layer is 20 nm or less, and minimizes the composition change of the base material constituting the damaged portion. To the limit.

  Further, the present invention can be implemented not only as an invention of a vehicle parts repair method but also as an invention of a vehicle parts repair device.

  Specifically, a vehicle part repair device is a vehicle part repair device that repairs a damaged part formed of a crack or depression in a resin part or a resin layer part having a resin layer in a vehicle, and generates plasma. A plasma torch that has a gas injection nozzle for supplying a plasma gas composed of nitrogen gas between the pair of electrodes and emits plasma into the atmosphere, and a voltage between the pair of electrodes It is good to provide the voltage application means which applies.

  In this case, the plasma torch preferably has a carbon dioxide gas supply port for supplying carbon dioxide gas of 1% or less as plasma gas. In this case, the carbon dioxide gas supply port may be shared with the gas injection nozzle. The plasma torch is preferably formed in a size that can be held by hand. According to these, the same effect as the vehicle parts repair method can be expected.

It is the schematic diagram which showed the outline of the structure of the repair apparatus used for the repair method of the vehicle components which concerns on this invention. It is sectional drawing which shows typically the mode of the nitride layer formed in the surface layer of resin-made components by the repair method of the vehicle components which concern on this invention. It is a flowchart which shows the operation | work process of the repair method of the vehicle components which concerns on this invention. It is the table | surface which showed the processing conditions or the processing content with respect to each sample name in the verification experiment which this inventor performed. It is the table | surface which showed the test result of the crosscut test for every sample in the verification experiment which this inventor conducted. It is the table | surface which showed the test result of the water resistance test for every sample in the verification experiment which this inventor conducted. It is the table | surface which showed the measurement result of the water wettability measurement for every sample in the verification experiment which this inventor performed. It is the table | surface which showed the measurement result of the surface roughness measurement for every sample in the verification experiment which this inventor performed. It is the table | surface which showed the analysis result of the atomic composition analysis for every sample in the verification experiment which this inventor performed. It is the table | surface which showed the analysis result of the atomic composition analysis regarding nitrogen (N) for every sample in the verification experiment which this inventor conducted.

  Hereinafter, an embodiment of a vehicle parts repair method according to the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram showing an outline of a configuration of a repair device 100 used in a vehicle parts repair method according to the present invention. Note that the drawings referred to in this specification are schematically shown by exaggerating some of the components in order to facilitate understanding of the present invention. For this reason, the dimension, ratio, etc. between each component may differ. The repair device 100 is used when repairing a resin part WK in a vehicle, for example, a damaged part DP such as a scratch, a crack or a depression generated in a cover of a door mirror, a bumper or a cowl in a two-wheeled vehicle.

(Configuration of repair device 100)
The repair device 100 includes a plasma torch 101. The plasma torch 101 is a device for irradiating the damaged portion DP of the resin part WK with the plasma F, and mainly includes a housing 102, a pair of electrodes 104, and a gas injection nozzle 106. The housing 102 is a component constituting the outer surface of the plasma torch 101, and is formed by forming a resin material into a box shape that can be gripped by a person. The housing 102 has an irradiation port 103 formed by opening one of the six side surfaces (a side surface facing downward in the figure), and includes a pair of electrodes 104 and a gas injection nozzle 106 therein. ing.

  The irradiation port 103 is an opening for emitting plasma F. In the present embodiment, it is formed in a rectangular shape extending in the horizontal direction in the figure. A pair of electrodes 104 is provided on the back side of the irradiation port 103. The pair of electrodes 104 is an electrode for generating plasma by glow discharge, and is composed of a pair of metal wires arranged to face each other. In this case, the pair of electrodes 104 are arranged to face each other at an interval at which the strip-shaped plasma F having a width of 30 mm can be emitted from the irradiation port 103. The pair of electrodes 104 is electrically connected to the power supply device 110 via the electric cable 105. A gas injection nozzle 106 is provided on the back side of the pair of electrodes 104.

  The gas injection nozzle 106 is a nozzle for continuously supplying plasma gas to be converted into plasma between the pair of electrodes 104, and is configured by forming a resin material into a cylindrical shape. The gas injection nozzle 106 passes through the housing 101 and is exposed to the outside, and a tip portion thereof is connected to the gas cylinder 120 via a flexible hose 107.

  The power supply device 110 is an electric device for applying a voltage to the pair of electrodes 104. In the present embodiment, the power supply apparatus 110 can receive a power supply from a general household power supply (100 V) and apply a desired voltage to the pair of electrodes 104 in the range of 10 KV to 20 KV.

  The gas cylinder 120 is a container for storing nitrogen gas as plasma gas supplied to the gas injection nozzle 106. A flow rate adjusting valve 121 is provided on the hose 107 that guides the nitrogen gas stored in the gas cylinder 120 to the gas injection nozzle 106. The flow rate adjusting valve 1121 is a valve that can adjust the flow rate of the nitrogen gas flowing through the hose 107 to a desired flow rate.

(Operation of repair device 100)
Next, a vehicle part repair method using the repair device 100 configured as described above will be described. In this embodiment, a vehicle bumper made of a composite material of polypropylene resin is used as a resin part WK, and a repair process of a damaged portion DP formed by a depression generated on the outer surface of the resin part WK will be described.

  First, the worker performs rough correction of the damaged portion DP as the first step. The rough correction of the damaged portion DP is a process of making the damaged portion DP as close to the original shape as possible and smoothing the surface of the damaged portion DP. Specifically, when the damage is scratched, the operator smoothes the damaged portion DP by sanding it using sandpaper or the like to remove burrs or the coating film of the damaged portion DP. In the case where the damage is a depression such as a depression, the operator heats the damaged portion DP to make it in a semi-molten state and makes the damaged portion DP as close to the original shape as possible, and then performs the sanding to cause damage. The portion DP is smoothed. If the damage is a crack or a crack, the operator heats the damaged portion DP to make it in a semi-molten state and makes the damaged portion DP as close to the original shape as possible. Smooth DP.

  Next, the operator performs plasma processing on the damaged portion DP as a second step. Specifically, after preparing the repair device 100, the operator turns on the power supply device 110 while holding the plasma torch 101 and opens the flow rate adjustment valve 121. Thereby, the repair apparatus 100 emits the plasma F based on nitrogen gas from the irradiation port 103 in the plasma torch 101. The operator operates the operation element and the flow rate adjustment valve 121 in the power supply device 110 to adjust the output voltage from the power supply device 110 and the flow rate of nitrogen gas from the gas cylinder 120, respectively, thereby generating plasma F emitted from the irradiation port 103. The emission length is adjusted to about 40 mm and the emission width is adjusted to about 30 mm.

  Next, the operator irradiates the damaged portion DP of the resin part WK with the plasma F. Specifically, the operator holds the plasma torch 101 and irradiates the damaged portion DP in the resin part WK with the plasma F. In this case, the operator irradiates the damaged portion DP with the plasma F within a range of 1 second to 5 seconds. In this case, the operator can efficiently irradiate the damaged portion DP with the plasma F because the plasma F is formed wide. As a result, a nitride layer NL is formed on the surface layer of the damaged portion DP irradiated with the plasma F, as shown in FIG.

  Here, the nitride layer NL is a layer containing nitrogen in the surface layer of the damaged portion DP of the resin part WK, more specifically, nitrogen mainly C—NH (amino group) and N—C (O) (amide). It is a layer containing a functional group. The nitride layer NL is formed in a range of approximately 5 nm to 20 nm from the surface of the damaged portion DP of the resin part WK. Then, the operator who generates the nitride layer NL on the surface layer of the damaged portion DP of the resin part WK turns off the power supply 110 and closes the flow rate adjustment valve 121. Thereby, the repair apparatus 100 stops the emission of the plasma F from the irradiation port 103 of the plasma torch 101. The plasma treatment step in the second step corresponds to the nitride layer treatment step according to the present invention.

  Next, the worker applies putty to the damaged portion DP of the resin part WK as the third step. Specifically, the operator can perform the operation of applying putty immediately after performing the plasma treatment on the damaged portion DP of the resin part WK. In this case, the putty is made semi-solid with a resin material such as an unsaturated polyester resin or an epoxy resin. Since the operation of painting the putty is the same as the conventional operation, detailed description is omitted. The step of applying putty in the third step corresponds to the putty coating step according to the present invention.

  Next, the worker applies a surfacer on the putty applied on the damaged portion DP of the resin part WK as a fourth step. In this case, the worker applies the surfacer by masking the periphery of the damaged portion DP after the putty applied on the damaged portion DP is sufficiently dried. The surfacer is a base agent that is applied to fill fine scratches on the putty and improve the adhesion and uniformity of the paint. Since the operation of applying the surfacer is the same as the conventional operation, detailed description thereof is omitted.

  The operator may omit the work of applying the surfacer and apply the paint described later. Further, the operator may perform the plasma treatment in the second step instead of the operation of applying the surfacer. In this case, the operator does not need to mask around the damaged portion DP. By forming the nitride layer NL on the putty by this plasma treatment, the adhesion of the paint can be enhanced.

  Next, the worker paints the damaged portion DP of the resin part WK as the fifth step. Specifically, the worker waits for the surfacer to dry and applies the paint on the damaged portion DP including the periphery of the damaged portion DP. Since the operation | work which applies this coating material is the same as the conventional operation | work, detailed description is abbreviate | omitted.

  Here, the result of the demonstration experiment of the plasma treatment for the resin part WK performed by the present inventor will be described. As shown in FIG. 4, when applying the putty without performing the plasma treatment on the resin component WK, the inventor performs the putty after performing the plasma treatment on the resin component WK under four treatment conditions. In the case of applying a putty after applying an itro process to the resin part WK, a cross-cut test, a water resistance test, a water wettability measurement, a surface roughness measurement and a surface atomic composition analysis are performed, respectively. It was. In this case, the number of samples in the demonstration experiment is 10 for each of the untreated product, the plasma treated product, and the ittro treated product.

  Here, the four conditions in the plasma treatment are “N-1 treated product” and “N-3 treated product” in which the irradiation time is 1 second and 3 seconds using only nitrogen gas as the plasma gas, “NCO-1 treated product” and “NCO-3 treated product” were prepared by using a mixed gas obtained by adding 0.1% carbon dioxide gas to nitrogen gas as the plasma gas and setting the irradiation time to 1 second and 3 seconds. .

  In this case, when a mixed gas of nitrogen gas and carbon dioxide gas is used as the plasma gas, as shown by a two-dot chain line in FIG. 1, the gas cylinder 122 for storing the carbon dioxide gas and the carbon dioxide gas stored in the gas cylinder 122 are used as the gas. A hose 108 that leads to the injection nozzle 106 and a flow rate adjusting valve 123 that adjusts the flow rate of carbon dioxide in the hose 108 may be provided. The carbon dioxide gas as the plasma gas may be supplied by preparing a gas cylinder separate from the nitrogen gas, but is supplied by filling one gas cylinder, that is, the gas cylinder 120 with a mixed gas of nitrogen gas and carbon dioxide gas. Of course, it may be configured to do so.

Itro treatment is a surface modification treatment that forms a SiO ₂ (silicon oxide) layer on the surface of a plastic part WK by blowing a small amount of a silane compound into a butane flame. It is often used.

  First, the test result of the crosscut test will be described with reference to FIG. The cross cut test was conducted by the old JISK5400 paint general test (cross cut test) method. According to this cross-cut test, extremely good adhesion was confirmed in any of the samples subjected to plasma treatment under four treatment conditions.

  Next, the test results of the water resistance test will be described with reference to FIG. The water resistance test is to confirm what kind of change occurs in the boundary surface between the resin part WK and the putty when each sample is left in warm water at 80 ° C. for 10 hours. According to this water resistance test, good adhesion was confirmed in any of the samples subjected to the plasma treatment under the four treatment conditions as compared with the other samples.

  Next, the measurement result of the wettability measurement will be described with reference to FIG. The water wettability measurement is to measure the contact angle of water droplets attached to the surface of each sample. According to the measurement result of the water wettability measurement, it was confirmed that the hydrophilicity was improved in any of the samples subjected to the plasma treatment under the four treatment conditions. In this case, it was confirmed that the hydrophilicity of “N-3 treated product”, “NCO-1 treated product”, and “NCO-3 treated product” was improved as compared with “Itro treated product”. That is, it is conceivable that the adhesion to the putty is improved by performing the plasma treatment on the resin part WK.

  Next, the measurement result of the surface roughness measurement will be described with reference to FIG. In the surface roughness measurement, the surface roughness of each sample is measured by the root mean square roughness. According to the measurement results of the surface roughness measurement, it was confirmed that the surface roughness hardly changed even when the plasma treatment was performed on the resin part WK. On the other hand, it is confirmed that the surface roughness of an itro-treated product is roughened by the itro treatment, and this roughness is considered to improve the adhesion of a paint or the like.

  Next, the analysis result of the surface layer atomic composition analysis will be described with reference to FIGS. 9 and 10 respectively. Surface layer atomic composition analysis consists of two layers: a layer from the surface of each sample to 6.3 nm (depth corresponding to one molecule) and a layer from the surface to 13 nm (depth corresponding to two molecules). This is an analysis of the atomic composition. According to the analysis result of the surface layer atomic composition analysis, a slight decrease in carbon can be confirmed in the surface layer of the resin part WK, but the surface layer of the resin part WK is 0.7% or more and 2.2% relative to the carbon atoms. It can be confirmed that the adhesiveness is improved if it is constituted so as to contain not more than% nitrogen atoms. In this case, as shown in FIG. 10, nitrogen is present at nitrogen functional groups of “CN—H” and “N—C (O)”.

  On the other hand, in the ito-processed product, approximately half of the surface carbon is oxidized, and it cannot be said that the composition of the base material of the resin part WK is maintained. That is, according to the plasma treatment, the adhesiveness can be improved while suppressing the change in the composition of the base material of the resin part WK, while the change in the composition of the base material of the resin part WK is remarkably durable in the intro process. It can be inferior in terms of In FIG. 10, the chemical state of N at “˜6.3 nm” in the “NCO-3 treated product” is shown with a range because the measured value was unstable.

  As can be understood from the above operation description, according to the above embodiment, the vehicle part repair method does not form a primer layer on the surface of the damaged part DP in the resin part WK, but on the surface layer of the damaged part DP. Since the nitride layer NL is formed, the reliability of the putty adhesion to the damaged portion DP can be improved.

  Furthermore, in carrying out the present invention, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the object of the present invention.

  For example, in the above embodiment, only nitrogen gas is used as the plasma gas. However, as shown in the demonstration experiment, the plasma gas may be a mixed gas in which nitrogen gas contains 1% or less of carbon dioxide gas. According to this, the plasma gas can be easily activated in the nitride layer generation step, and the workability is improved. In addition, although nitrogen gas is used as the plasma gas in the present invention, it does not necessarily mean that only nitrogen gas is used, and the nitrogen gas can be contained in the surface layer of the resin component WK to the extent that the nitrogen functional group can be contained. It suffices if it contains gas, and preferably contains nitrogen gas as the main component.

  In the above embodiment, the nitride layer NL is formed in the range of 5 nm to 20 nm from the surface of the resin part WK. However, the formation depth of the nitride layer NL is not limited to the above embodiment, and can be formed to 20 nm or more. However, according to the inventor's demonstration experiment, it was confirmed that the nitride layer NL can sufficiently secure adhesion at a depth of 20 nm or less.

  Moreover, in the said embodiment, it comprised so that the plasma F radiate | emitted from the irradiation port 103 of the plasma torch 101 might be irradiated with respect to resin-made components WK. That is, the repair device 100 in the above embodiment is a so-called remote type plasma irradiation device. However, the vehicle parts repair method according to the present invention can be configured by a so-called direct type plasma irradiation apparatus in which a resin part WK is disposed between a pair of electrodes 104 to irradiate plasma.

  Therefore, the repair device 100 only needs to be configured to be able to perform plasma treatment using nitrogen gas as a plasma gas for the resin part WK. For example, instead of using a pair of electrodes 104, an induction coil is used, The power supply device 110 can also be configured to apply a high-frequency current to the induction coil.

  Moreover, in the said embodiment, the process which repairs the bumper for vehicles made from a polypropylene resin as the resin parts WK was demonstrated. However, the resin part WK can be widely applied to resin parts constituting the vehicle, such as a door mirror cover and a cowl in a two-wheeled vehicle. Further, the material constituting the resin part WK can be widely applied to various resin materials such as resin other than polypropylene resin, such as epoxy resin, ABS resin, and nylon resin. The present invention also relates to a part other than a resin part, specifically, a resin layer part in which a layer of a resin material is formed on the surface of a material other than a resin material, for example, a resin body part on the surface of a metal body. It can also be applied to body parts and fuel tanks coated with paint.

WK ... resin parts, DP ... damaged part, F ... plasma, NL ... nitride layer,
100 ... repair device,
DESCRIPTION OF SYMBOLS 101 ... Plasma torch, 102 ... Housing, 103 ... Irradiation port, 104 ... A pair of electrodes, 105 ... Electric cable, 106 ... Gas injection nozzle, 107 ... Hose, 108 ... Hose,
110 ... power supply,
DESCRIPTION OF SYMBOLS 120 ... Gas cylinder, 121 ... Flow control valve, 122 ... Gas cylinder, 123 ... Flow control valve.

Claims (5)

A repair method of a vehicle part for repairing a damaged part consisting of a scratch, a crack or a depression generated in a resin part or a resin layer part having a resin layer in a vehicle,
A nitride layer generating step for generating a nitride layer containing a nitrogen functional group on the surface of the damaged portion;
A vehicle part repairing method comprising a putty application step of applying putty to the surface of the nitride layer. In the repair method of the vehicle components described in claim 1,
The nitride layer generation step includes
A method for repairing a vehicle part, wherein a surface layer of the resin part contains 0.7% or more and 2.2% or less of nitrogen atoms with respect to carbon atoms. In the repair method of the vehicle parts described in claim 1 or claim 2,
The nitride layer generation step includes
A method for repairing a vehicle component, comprising performing an atmospheric pressure plasma treatment using nitrogen as a plasma gas on the damaged portion. In the repair method of the vehicle components described in claim 3,
The nitride layer generation step includes
A method for repairing vehicle parts, wherein the plasma gas contains carbon dioxide gas of 1% or less. In the repair method of the vehicle components as described in any one of Claim 1 thru | or 4,
The method for repairing a vehicle component, wherein the nitride layer is 20 nm or less.

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