JPH01299677A - Method for electrostatically coating plastic part - Google Patents

Abstract

PURPOSE:To apply a uniform electrostatic coating by fixing one end of a tape to a plastic part, fixing the other end to a metallic part, applying a conductive primer on the plastic part and tape, and then simultaneously electrostatically coating the metallic and plastic parts. CONSTITUTION:When the fuel filler lid of a car body is electrostatically coated, for example, one end of a tape 10 is fixed to the fuel filler lid 4 as the plastic part, and the other end of the tape 10 is fixed to a metallic hinge 5 through a bolt 6. A conductive primer is applied on the plastic part and tape 10 under such conditions, and dried. By this operation, electric conductivity is imparted to the surface of the plastic part. Subsequently, an atomized paint is negatively charged in an electrostatic coating booth with a material to be coated as the anode to simultaneously deposit the paint on the metallic and plastic parts as the material to be coated, and intermediate coating and final coating are carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method for coating resin parts such as fuel filler lids and tractor pull head ride lids simultaneously with metal vehicle body panels.

(Prior Art) An electrostatic coating method in which atomized and charged paint is attached to the surface of a metal part by electrostatic attraction is widely used as an intermediate coating and an E-coating method for car bodies.

On the other hand, some recent automobiles have parts of their bodies, such as fuel filler lids, made of resin.

If you try to apply electrostatic painting to a car body that has some resin parts built in at the same time, the charge rate will be different from the metal car body panel because the resin parts are non-self-conductors, and the resin parts will be coated with electrostatic paint. There is a problem that the paint adheres to the surface, making it impossible to apply uniformly.

As a prior art to solve this problem, Japanese Unexamined Patent Publication No. 131-2
27870 and JP-A-81-2458135 are known. Japanese Patent Publication No. 81-227870
The technology disclosed in JP-A-61-245885 connects a metal vehicle body panel and a resin fuel filler lid using a metal jig, and the technology disclosed in JP-A-61-245885 connects a metal vehicle body panel and a resin fuel filler lid. By applying a conductive primer in advance and applying salt so that the conductive primer comes into contact with the vehicle body panel, the vehicle body panel and the resin fuel filler lid can be electrostatically coated at the same time.

(Problems to be Solved by the Invention) In JP-A No. 111-227870, a special metal jig must be prepared, and even when a metal jig is used, sufficient electricity cannot be supplied to the resin parts. Is it possible to give a certain level of uniformity? ! Cannot be painted.

On the other hand, according to Japanese Patent Application Laid-open No. 61-245885, the above problem is solved, but 1. For example, when the fuel filler lid is opened in order to electrostatically paint the concave part of the vehicle body provided inside the fuel filler lid at the same time. When performing electrostatic painting, the conductive primer applied to the fuel filler lid loses contact with the vehicle body, creating an electrically discontinuous state and preventing uniform electrostatic painting.

(Means for Solving the Problems) In order to solve the above problems, the present invention fixes one end of the tape to a resin component such as a fuel filler lid or a tractor pull head ride lid, and fixes the other end of the tape to a resin component such as a fuel filler lid or a tractor pull head ride lid. was fixed to a metal part, a conductive primer was applied to the surface of this tape and the resin part, and then electrostatic coating was applied to the metal 111 part and the resin part at the same time.

(Function) Even if the resin part is separated from the metal part by rotating or sliding, the resin part and the metal part are electrically connected via the conductive primer applied to the tape. Therefore, uniform electrostatic coating can be applied.

(Example) Embodiments of the present invention will now be described with reference to the accompanying drawings.

11rI4 to 3 are diagrams showing the state before the coating is applied when electrostatic coating is applied to the Fehrfila lid, and Figures 4 to 6 are diagrams showing the state before the coating is applied when electrostatic coating is applied to the tractor pull head ride lid. Specifically, Figure 1 is a plan cross-sectional view of the fuel filler lid attached to the vehicle body, Figure 2 is a perspective view of the fuel filler lid opened, and Figure 3 is an enlarged view of the main parts of Figure 2. , Fig. 4 is a perspective view showing the tractor pull head ride lid attached to the vehicle body, Fig. 5 is a perspective view showing the state in which the tractor pull head ride lid is removed from the state shown in Fig. 4, and ti11B is the 5th It is an enlarged view of part A in the figure.

First, to explain the fuel filler lid, a recess 2 is formed in the side panel 1 of the vehicle body, a 7-fuel injection port 3 is provided at the bottom of each of the four parts 2, and a resin inlet is provided at the opening of the recess 2. The fuel filler lid 4 is installed so that it can be opened and closed. That is, a hinge 5 is fixed to the inner surface of the recess 2 via a bolt 6 and a nut 7, and an angle portion 9 of the fuel filler lid 4 is rotatably supported by the hinge 5 via a shaft 8. One end of the tape IO is attached to the fuel filler lid 4, and is fixed to the metal hinge 5 via the bolt 6 at the other end of the tape 10.

Here, the surfaces of the tape 10 and the fuel filler lid 4 are coated with a conductive primer.

Further, as the tape 10, a tape that can withstand the temperature at which the conductive primer is dried and more preferably allows the paint to easily penetrate is used.

On the other hand, regarding the retractable head ride lid,
A metal hinge 24 is attached with bolts 23 within the four parts 22 formed on the front panel 21 of the vehicle body, a resin bracket 26 is rotatably supported on this hinge 24 via a shaft 25, and a retractable head ride lid is attached to this bracket 26. 27 and swings the bracket 26 with a drive arm 28, thereby opening and closing the retractable head ride lid 27.

Also in this embodiment, the metal hinge 24 and the resin bracket 26 are bridged with the tape 10, and the bracket 26. A conductive primer is applied to the retractable headlight lid 27 and the tape 10.

Next, an outline of the electrostatic coating method of the present invention will be explained based on FIG. 7.

First, metal parts such as hinges are coated with an undercoat using electrodeposition coating, and then dried.

In addition, for resin parts such as fuel filler lids or tractor pull head ride lids, attach the resin part to the metal part, electrodeposit one end of the tape IO on the resin part and the other end on the metal part, In this state, a conductive primer is applied to the resin parts and the tape 10, and then dried. This operation imparts electrical conductivity to the surface of the resin component. This state is shown in FIGS. 1 to 6.

After this, in an electrostatic coating booth, the object to be painted is used as an anode, the atomized paint is negatively charged, the paint is efficiently attached to the metal parts and resin parts to be painted, intermediate coating and Apply top coat.

In the example, the other end of the tape was attached to the metal part before applying the conductive primer to the tape, but the tape was not applied between the metal part and the resin part. A conductive primer may be applied before tensioning, and the resin parts and metal parts are not limited to those mentioned in the examples.

(Effect of the invention) [Table 1 shows the resistance value (unit: MΩ: 106) between the resin part (fuel filler lid) and the metal part (hinge)
Ω) for the presence or absence of tape, and in each case, the results of testing for the presence or absence of color difference with the main body (vehicle body) are shown.

(Left below) As is clear from this table, according to the present invention, metal parts and resin parts are electrically connected by a tape coated with a conductive primer, so electrostatic painting can be performed at the same time. uniformity can be maintained even when

[Brief explanation of the drawing]

Figure 1 is a plan sectional view of the fuel filler lid attached to the vehicle body, Figure 2 is a perspective view of the fuel filler lid opened, Figure 3 is an enlarged view of the main parts of Figure 2, and Figure 4 Figure 5 is a perspective view of the tractor pull head ride lid attached to the vehicle body; Figure 5 is a perspective view of the tractor pull head ride lid removed from the state shown in Figure 4;
The figure is an enlarged view of part A in FIG. 5, and FIG. 7 is a block diagram showing the painting order. In addition, in the drawing, 1.21 is the vehicle body panel, 2 and 22 are the recesses, and 4
, 27 are resin parts, 5.24 are metal parts, and 10 is a tape.

Claims (3)

[Claims] (1) Attach one end of the tape to the resin part and the other end to the metal part, apply a conductive primer to the resin part and the tape, and then apply static electricity to the metal part and the resin part at the same time. An electrostatic coating method for resin parts, characterized by applying a coating. (2) The electrostatic coating method for resin parts according to claim (1), wherein the tape is heat resistant and paint permeable. (3) The application of the conductive primer is performed after one end of the tape is fixed to the resin part and the other end to the metal part. Electric coating method.