JPH0333556Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a molding structure for an automobile. In recent years, it has become popular for side moldings and bumper moldings made of synthetic resin to be attached directly to the vehicle body using pressure-sensitive tape or adhesives, and due to cost considerations, vinyl chloride resin is the main material used for the moldings. It is used. Further, with the trend toward lighter automobiles, foamed synthetic resin moldings are sometimes used. In the case of foam molding, polishing may be performed to improve the precision of the bonding surface to the vehicle body panel.
When polishing is performed, it is inevitable that air bubbles will be exposed on the joint surface. The molding has an appropriate modulus (hardness) depending on the purpose.
However, by adjusting the amount of plasticizer added to the vinyl chloride resin, a product with the desired modulus can be obtained. However, depending on the type of plasticizer, when used as side moldings or bumper moldings, weather resistance and adhesion properties are either suitable or unsuitable as shown in Table 1, and a plasticizer that satisfies all purposes has not yet emerged. Not yet. It is believed that the main cause of the decrease in adhesiveness in the molding is that the plasticizer in the molding migrates to the pressure sensitive tape and weakens its adhesive strength. Furthermore, when the joint surface of the molding made of foamed synthetic resin is polished to improve precision, the contact area with the pressure-sensitive tape is small, and a decrease in adhesive strength is inevitable. This invention eliminates the drawbacks of conventional moldings for automobiles by preventing the adhesiveness of foamed synthetic resin moldings from deteriorating even when plasticizers are used. An embodiment of this invention will be described based on the drawings. 5 is a molding body made of foamed synthetic resin used as a side molding or bumper molding of an automobile, and is made by adding a plasticizer to vinyl chloride resin to adjust the modulus (hardness). Further, the bonding surface of the foamed synthetic resin molding body 5 for bonding to the vehicle body panel is polished to form a polished surface 6 with exposed air bubbles. Furthermore, a UVcure primer 3 is applied to the polished surface 6, and the primer 3 fills the exposed air bubbles on the polished surface 6. When attaching the foamed synthetic resin molding body 5 to the vehicle body panel, pressure sensitive tape 4 or urethane bonding agent is applied to the primer 3 surface, and then the foamed synthetic resin molding body 5 is attached to the vehicle body panel. It is to be attached to. Since the ultraviolet curing primer 3 is interposed between the polished surface 6 and the pressure-sensitive tape 4, etc., the plasticizer present in the molding body 5 cannot be transferred to the pressure-sensitive tape 4, etc. Even if a plasticizer such as that shown in 1, which has an adverse effect on the adhesive strength of the pressure-sensitive tape 4 or the like, is used, no problem will occur. Particularly recently, there has been a trend for softer moldings for automobiles to be required, and for this reason, increasing the amount of plasticizer can be a sufficient response to this demand. Furthermore, when the bonding surface is polished to achieve precision, the bubble surface is exposed, so if the pressure-sensitive tape 4 is attached directly to the bonding surface, the adhesive area with the pressure-sensitive tape 4 will be narrowed and the adhesive force will be reduced. However, by applying the primer 3 to the bonding surface, it is possible to prevent the plasticizer from migrating to the pressure-sensitive tape 4, etc., and also to fill in the concave portions of the bubble surface and improve the adhesive strength. As mentioned above, in this invention, the molding body 5 made of foamed synthetic resin, which is adhered to the vehicle body panel with pressure sensitive tape 4 or urethane adhesive,
It is made by adding a foaming agent and various plasticizers to vinyl chloride resin, and the bonding surface of the molding body 5 to the vehicle body panel is formed into a polished surface 6 with exposed air bubbles, and the polished surface 6 and the pressure sensitive tape 4 An ultraviolet curing primer 3 is interposed between the polishing surface 6 and the polishing surface 6 so as to fill the exposed air bubbles. According to this invention, the transfer of the plasticizer present in the molding body 5 made of foamed synthetic resin to the pressure sensitive tape 4 etc. is prevented, so the pressure sensitive tape 4 is made of plasticizer.
It has the advantage that there is little weakening of the adhesive strength of other materials. Furthermore, since the primer 3 fills the exposed air bubbles on the polished surface 6, strong adhesive force can be obtained. 【table】

[Brief explanation of the drawing]

FIG. 1 is a vertical cut front view of a molding structure for an automobile showing an embodiment of this invention. 3... Ultraviolet curing primer for preventing plasticizer migration, 4... Pressure sensitive tape, 5... Molding body, 6... Polished surface.

Claims (1)

[Scope of utility model registration request] The molding body made of foamed synthetic resin, which is adhered to the car body panel with pressure sensitive tape or urethane adhesive, etc., is made of vinyl chloride resin with a foaming agent and various plasticizers added, and the molding body is bonded to the car body panel. The bonding surface is configured as a polished surface with exposed air bubbles, and an ultraviolet curing primer for preventing plasticizer migration is interposed between the polished surface and the pressure sensitive tape etc. so as to fill the exposed air bubbles on the polished surface. Characteristic automotive molding structure.