JP2006103242A - Repairing method of polypropylene resin part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a repairing method of a resin bumper formed of a polypropylene resin in order to repair damaged parts where cracks or the like are generated while securing strength. <P>SOLUTION: The repairing method is used for repairing damaged parts of the resin bumper composed of the polypropylene resin, in which cracking is generated by impact. The method comprises a polypropylene resin piece adhering process for adhering a polypropylene resin piece on an inside face of the damaged part through an adhesive, a polypropylene resin net covering process for covering the surface of the damaged part with a polypropylene resin net through the adhesive, and a putty coating process for coating the net with a putty. The adhesive is applied for fixing on a front face and a back face of the net through grids of the polypropylene resin net so as to secure strong fixing without producing thickness on the surface of the bumper. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for repairing a polypropylene resin portion, for example, a method for repairing a resin bumper mounted on the front and rear of an automobile, and this is applied to a damaged portion in which a crack or crack is generated in a resin bumper made of polypropylene resin. The present invention relates to a repair method for a polypropylene resin portion (bumper) that is restored to its original state.

As resin bumpers to be mounted on the front and rear of automobiles, those made of polypropylene resin are widely used due to the freedom of design and the structure of shock absorption. This resin bumper is integrally formed of polypropylene resin.
When the surface of this resin bumper is damaged due to a collision or the like, it is repaired by applying putty, polishing, and coating (Patent Document 1).
JP 2002-67895 A

However, if the above damage is a scratch, it can be repaired by the method of Patent Document 1 described above, but for damage such as cracks or cracks in the bumper, cracks etc. are only caused by putty application, polishing, and painting. Since it cannot be repaired, the repair method cannot deal with the bumper after the repair because the sufficient strength that the bumper originally had cannot be secured and it does not function as a bumper.
Therefore, the resin bumper in which cracks and the like are generated has to be replaced with new parts.

  The present invention has been made in view of the above circumstances, and in a resin part made of polypropylene resin, for example, a bumper made of polypropylene resin, a method for repairing a polypropylene resin part capable of repairing a damaged part having cracks and the like while ensuring strength is provided. It is intended to provide.

In order to achieve the above object, the present invention provides a method for repairing a polypyropylene resin part that repairs a damaged part 2 in which a resin bumper (polypyropylene resin part) 1 made of polypropylene resin has been cracked by impact, and includes the following steps: It is characterized by having.
Polypropylene resin piece sticking process. In this step, the polypropylene resin piece 20 is attached from the inner surface of the damaged portion 2 via the adhesive 21. The polypropylene resin piece 20 is made of a polypropylene synthetic resin, and is formed of a patch-like piece having an area large enough to cover the damaged portion from the inner surface.
Polypropylene resin net coating process. In this step, the surface of the damaged portion 2 is covered with a polypropylene resin net 30 via an adhesive 31. The polypropylene resin net 30 is a lattice-shaped net made of a polypropylene synthetic resin, and has an area large enough to cover the damaged portion from the surface.
Putty application process. In this step, the putty 40 is applied on the polypropylene resin net 30.

In the polypropylene resin net coating step, it is preferable to dispose the polypropylene resin net 30 so as to cover the damaged portion 2 and then apply the adhesive 31 from above.
This is because the application area of the adhesive 31 corresponding to the net area can be easily grasped because the polypropylene resin net 30 has already been arranged.

Moreover, it is suitable to have an adhesive drying step of spraying a curing agent from the surface and drying the adhesive after the polypropylene resin net coating step.
This is because by having the adhesive drying step, the curing of the adhesive for fixing the polypropylene resin net is accelerated and the workability is improved.

  According to the repair method of the polypyropylene resin portion of the present invention, the damaged portion 2 in the resin bumper 1 is covered from the inner surface by the polypropylene resin piece 20 and from the surface by the polypropylene resin net 30 and fixed through the adhesives 21 and 31. Therefore, even when repairing the damaged portion 2 in which a crack or a crack has occurred, the strength can be sufficiently secured for repair.

In that case, by using the polypropylene resin net 30, it can fix without having thickness in the surface side.
In addition, the adhesive 31 enters through the lattice of the polypropylene resin net 30 so that the adhesive 31 exists on the front side and the back side of the net, and the polypropylene resin net 30 is covered with the adhesive 31 to ensure strong fixing. it can.

  Therefore, it is possible to reuse the resin bumper in which cracks and cracks that have been forced to be replaced with new parts are repaired, and to effectively use existing parts and achieve an energy saving effect.

An example of an embodiment of a method for repairing a polypropylene resin portion of the present invention will be described with reference to the drawings. The polypyropylene resin part can be used not only for resin bumpers but also for hoods and doors in automobiles. The repair method will be described by taking a resin bumper made of polypyropylene resin as an example.
FIG. 1 is a perspective explanatory view of a resin bumper to be repaired by the method of the present invention, FIG. 2 (a) is a polypropylene resin piece used in the method of the present invention, and FIG. 2 (b) is a polypropylene resin net used in the method of the present invention. FIG. 3 is a perspective explanatory view, and FIG. 3 is an explanatory view of the work process on the resin bumper surface side of the method of the present invention.

First, the resin bumper 1 made of a polypropylene resin having the damaged portion 2 in which a crack or a crack has occurred due to a collision or the like is removed from the vehicle body (not shown).
Next, the bumper material is polished from the surface to the resin bumper surface portion 10 where the damaged portion 2 of the resin bumper 1 is present, and a taper surface 11 for mounting a polypropylene resin net and applying a putty, which will be described later, is used as a resin. It forms in the crack location of the damaged part 2 on the bumper side.

  Then, the polypropylene resin piece 20 is stuck through the adhesive 21 from the inner surface of the damaged part 2 (polypropylene resin piece sticking step). As shown in FIG. 2A, the polypropylene resin piece 20 is made of a polypropylene synthetic resin, and is formed of a patch-like piece having an area large enough to cover the damaged portion 2 from the inner surface. Although it is rectangular in FIG. 2A, an appropriate shape is used according to the size of the damaged portion 2.

The polypropylene resin piece 20 is applied so that the adhesive 21 is applied to the entire grounding surface side of the resin bumper so that the cracked portion of the damaged portion 2 is located at a substantially central position of the polypropylene resin piece 20.
The adhesive 21 is for fixing the polypropylene resin piece 20 and the inside of the resin bumper surface portion 10, and is preferably a quick-drying type capable of exhibiting an adhesive effect without dissolving the polypropylene resin. When a quick-drying type adhesive is used, good workability can be ensured because it cures in about 2 minutes.

  Next, the surface (tapered surface 11) of the damaged portion 2 is covered with a polypropylene resin net 30 made of polypropylene resin, and applied according to the net area so as to be filled with the adhesive 31 (polypropylene resin net covering step). ). As shown in FIG. 2B, the polypropylene resin net 30 is a lattice-shaped net made of polypropylene synthetic resin, has a lattice interval of about 20 to 50 mesh, and has a shape corresponding to the damaged portion 2. And an area large enough to cover the damaged portion 2 from the surface. The reason why the lattice spacing of 10 to 50 mesh is used is to allow the adhesive 31 to be present on the front side and the back side of the net by the entry of the adhesive 31 through the lattice. This is because a mesh hole) is required. Further, the net is mounted so that the crack of the damaged portion 2 is located at the substantially center position of the polypropylene resin net 30.

  The adhesive 31 is applied so as to cover the polypropylene resin net 30 so that the polypropylene resin net 30 and the resin bumper surface 10 are fixed to the resin bumper surface by entering from the lattice of the polypropylene resin net 30. The By using the polypropylene resin net 30 and the adhesive 31, the damaged portion 2 can be covered without having a thickness on the resin bumper surface side.

Since the adhesive 31 is applied from above the polypropylene resin net 30, the adhesive 31 enters the taper surface 11 side through the lattice of the polypropylene resin net 30 and is fixed to the resin bumper side. Since 31 also remains on the polypropylene resin net 30, the polypropylene resin net 30 can be covered, and strong fixation can be secured.
Moreover, the application area of the adhesive 31 according to the net area of the polypropylene resin 30 can be easily grasped by applying the adhesive 31 from the polypropylene resin net 30.

As the adhesive 31, the same quick-drying type as that used when fixing the polypropylene resin piece 20 and the resin bumper 1 is used.
Then, after the adhesive is applied, a quick-drying type adhesive is reacted and sprayed on the entire surface of the polypropylene resin net 30 to which the adhesive is applied. By spraying this curing accelerator, the drying time of the adhesive 31 can be shortened to about several seconds, and workability can be improved.

  In the above example, after the polypropylene resin net 30 is placed, the adhesive is applied and the curing accelerator is spray-coated. First, the adhesive is applied onto the resin bumper, and then the polypropylene resin net 30 is placed. Then, the procedure of spray coating the curing accelerator may be used. Even in this case, the adhesive 31 enters the polypropylene resin net 30 through the lattice of the polypropylene resin net 30 so that the adhesive is present on the front and back sides of the polypropylene resin net, and the polypropylene resin net is covered with the adhesive. By doing so, it is possible to secure a strong fixation.

Next, a primer (adhesive) is applied onto the polypropylene resin net 30 disposed so as to cover the tapered surface 11, and the putty 40 is applied. The primer is for improving the adhesion with the putty 40.
The putty placed after the putty 40 is dried is polished and surfaced to form a flat surface on the resin bumper surface portion 10. Thereafter, a primer surfacer is applied as a base of the paint, and a normal painting with the paint is performed to complete the operation.

  In the above-described example, the method for repairing a resin bumper made of a polypyropylene resin has been described. However, if the part uses a polypyropylene resin, the repair work can be performed in the same work process. It can also be used as a repair method for parts.

It is an isometric view explanatory drawing of the resin bumper which the damage part produced by the collision etc. (A) is a perspective explanatory view of a polypropylene resin piece used in the bumper repair method of the present invention, (b) is a perspective explanatory view of a polypropylene resin net. It is process drawing for demonstrating the operation | work process of the bumper repair method by this invention, (a)-(e) is sectional explanatory drawing in the resin bumper surface part which has a damaged part.

Explanation of sign

1 Resin bumper (polypropylene resin part)
2 Damaged part 10 Resin bumper surface part 11 Tapered surface 20 Polypropylene resin piece 21 Adhesive 30 Polypropylene resin net 31 Adhesive 40 Putty

Claims (3)

For a part made of polypropylene resin, when a crack occurs due to impact, a repair method for the polypropylene resin part to repair the damaged part,
A polypropylene resin piece attaching step for attaching a polypropylene resin piece through an adhesive from the inner surface of the damaged portion;
A polypropylene resin net coating step of covering the surface of the damaged portion with a polypropylene resin net via an adhesive;
A putty application process for applying putty on the net;
The repair method of the polypropylene resin part characterized by comprising. The method for repairing a polypropylene resin portion according to claim 1, wherein the polypropylene resin net coating step is performed by applying an adhesive from above after disposing the net so as to cover the damaged portion. The repair method of the polypropylene resin part of Claim 1 which has an adhesive agent drying process which sprays a hardening | curing agent from the surface and dries an adhesive agent after a polypropylene resin net coating process.

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