JPS62101634A - Production of molding - Google Patents

Abstract

PURPOSE:To obtain a molding having a coating which can resist peeling, discoloration, etc., for a long time, by molding a flexible synthetic resin containing a plasticizer into a molding and coating it after subjecting its external surface to low-temperature plasma treatment. CONSTITUTION:A molding M is produced from a flexible synthetic resin (e.g., flexible vinyl chloride resin) containing a plasticizer (e.g., dioctyl phthalate) and is held in a cylindrical chamber 20 by supporting it on a hunger 21. The hungers are rotated and the chamber 20 is evacuated to a high vacuum. A gas mixture formed by mixing CO2 gas with a gas such as He or Ar is slowly fed at a small flow rate from a cylinder 2 to the chamber 20 and at the same time microwaves are applied to the gas mixture to generate a plasma of the gas at a generator part 25. This plasma is applied to the molding M. This molding M is withdrawn and coated to obtain the purpose molding.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method of manufacturing a molding, and more particularly to a method of manufacturing a molding in which the outer surface of the molding body is coated with a desired color tone.

Conventional technology In general, vinyl chloride resins have good physical properties and are relatively inexpensive, so they are widely used in various molded products, and their physical properties can be further improved depending on the intended use. Preferably, various additives such as a low molecular weight plasticizer, an ultraviolet absorber, a coloring agent, and a flame retardant are mixed into the resin. For example, soft polyvinyl chloride resin is often used for vehicles, but it is made from dioctyl phthalate (D
OF), dioctyl phthalate (DHP), dibutyl phthalate (DBP), dioctylamine (DOA),
It is made soft by mixing a plasticizer such as trimetate ester. Furthermore, products such as moldings are formed by extrusion or injection molding using vinyl chloride resins containing this plasticizer. After molding the main body of the molding, the outer surface is painted in a desired color to enhance its decorativeness.

Problems to be Solved by the Invention By the way, in this molding, when the high-grade, low-polarized molding is used for a long period of time, the plasticizer leaks from the inside to the outside surface little by little, causing the paint film to peel off or discolor. Jlp
A situation arises. Further, it acts to stain and deteriorate the paint film on the side of the vehicle body panel in which the molding is placed in contact.

In order to eliminate such problems, measures have been taken, for example, to apply a topcoat after applying a special primer to the surface of the molding, or to combine various plasticizer distributions, but these methods require a lot of man-hours. This not only increases costs but also adds administrative complexity.

Means for Solving the Problems In the method for manufacturing a molding according to the present invention, after the molding body is molded from a soft synthetic resin containing a plasticizer, at least the outer surface thereof is subjected to low-temperature plasma treatment and painted. It is being done.

Function: This molding manufacturing method forms a crosslinked thin film on the outer surface of the molding body through plasma treatment using mixed gas irradiation, which prevents the exposure of the plasticizer and also reduces the sticky or sticky feeling on the outer surface. Since the amount can be reduced, it becomes possible to easily form a coating film with good decorative properties that does not cause peeling or discoloration even after long-term use.

Embodiments will now be described with reference to the accompanying drawings.

This molding manufacturing method involves forming a molding body using synthetic resin such as soft vinyl chloride resin, applying low-temperature plasma treatment to at least the outer surface of the molding body, and then painting the molding body that has undergone this plasma treatment. It is manufactured as a product by performing necessary processing including the following.

For example, as shown in Fig. 1, the molding body M is formed of a soft synthetic resin such as polyvinyl chloride to which a plasticizer is added, and the molding body M is formed of an elastic tape such as aluminum foil or polyethylene terephthalate resin. A tape-shaped decorative film T1 in which a core material C is embedded, and when a red tone is desired along the longitudinal direction of the molding body M, a colored polyvinyl chloride resin film or a metallic luster color of a metal base layer is injected. is placed on a part of the outer surface, and the decorative film T1 is covered with a tape-shaped protective film T2 formed with a slightly narrow width from a synthetic resin such as polyethylene or terephthalate. To mold this molding body M, as shown in FIG. 2, a core material C1, a decorative tape T1, and a protective tape T2 are introduced into the extrusion mold 10 through the respective insertion holes, and the synthetic resin is extruded within the orifice. Each can be placed at a predetermined position on the molding body M when taken out. After this extrusion, the molding body M is cooled in a cooling tank 11, sent out backward by a land clearing machine 12, and cut into a predetermined length by a continuously arranged cutter 13, thereby forming a molding body M. I can do it.

The molding body M is subjected to a post-processing process in which the ends are cut and molded. This shaping can be carried out by cutting perpendicularly to the axis of the molding body M, or by cutting obliquely as shown in FIGS. 3a and 3b. In addition, this molding body M has a fastener S such as a clip formed of a strong elastic material such as polyamide resin or polyacetal resin on the back surface near the terminal as shown in Fig. 4.
can be installed. The stopper S is to be locked into a stopper hole in the object to be attached when the molding main body M is attached to the object, and the base surface of the stopper S is forced into contact with the back surface of the molding main body to forcibly By rotating them, they can be welded together by frictional heat and can be accessed. Note that this stopper S may not need to be attached if the molding body M is light in weight per unit length.

The molding body M, which has been molded up to the garlic level, is subjected to low-temperature plasma treatment as shown in FIG. This low-temperature blasting process is carried out using a cylindrical chamber 20 (“Pelger”).
Also called. ) can be added by accommodating a large number of molding bodies M within. Chang/=Knee 2
0 is provided with a bunker 21 on which the molding body M is placed.
support. By rotating the hanger 21 and operating the oil rotary pump 22 and mechanical booster pump 23, the inside of the chamber 20 is brought to a vacuum level of lO2~
l While keeping it at around O-2TORR, add He to CO gas,
Gas such as Ar, Ne, H2, 02, air gas, or a mixture of two or more of them is supplied little by little from the pump 24. When the microwaves generated by an oscillator (not shown) are guided along with the supply, gas plasma is generated in the generator section 25 and passes through the transmission pipe 26 along with the gas flow, thereby irradiating the molding body M from the plasma outlet 27. be able to. During this irradiation, if the molding body M is a long object, a plurality of plasma outlets 27 are provided in the longitudinal direction of the chamber 20 as shown in FIG. In this case, it is preferable to provide a plasma outlet 27' on the side of the chamber 20 as well. After the plasma treatment was performed for about 10 to 60 seconds, the chamber 2
The process can be completed by returning the zero internal pressure to normal atmospheric pressure and taking out the molding body M. When this plasma treatment is applied, a crosslinked thin film is formed on the surface of the molding body M, and the extremely soft sticky feeling and sticking feeling that occurs when a large amount of plasticizer is contained is reduced from the surface. It becomes like this. In addition, although the plasma irradiation was explained using microwave oscillation in the above-mentioned embodiment, glow discharge, corona discharge, etc. can be applied in addition to this.

In addition, since the decorative tape T1 is covered with the protective tape T2 during plasma treatment, the film surface is not directly irradiated with plasma and problems such as fading and discoloration do not occur.

The molding subjected to this plasma treatment is then subjected to necessary processing. The processing includes forming an end cap E at the end of the molding body M as shown in FIG. This end camp E is the cavity type 30 of the injection mold. It can be formed by inserting the end side of the molding body M into the core mold 31 and injecting molten synthetic resin of the same quality as the molding body through the runner 32 and the cage 33. Also,
Prior to this, a thermally activated adhesive A1 may be applied to the cut end surface of the molding body M to firmly bond the end cap E. After molding the endcamp E, as shown in FIG. 8, the outer surface of the molding body M, including the endcamp E, is coated with urethane paint, polyester/urethane paint, or acrylic paint using a paint tool 40 such as a spray gun. Can be painted.

The coating can be applied by hanging the stopper S attached to the back surface of the molding body M on a hanger 41 or the like, so that a predetermined coating film P can be formed only on the outer surface side of the molding body M. When spraying this paint, if the decorative tape T1 is covered with the protective tape T2, the paint can be prevented from adhering to the decorative tape T1, and if it is not covered with the protective tape T2, a separate mask is used. Painting can be done using equipment.

After painting, for example, at a temperature of about 70 to 80°C,
After baking for about 40 minutes, the product is manufactured as product M1.

The molding product M1 manufactured in this way is the 9th molding product M1.
As shown in the figure, a pressure-sensitive double-sided adhesive tape T3 is applied to the back side, and as shown in Figure 10, the protective tape T2 is removed and the release paper is peeled off from the adhesive tape T3. It can be attached by applying a spiral urethane adhesive A2 and pressing it onto an object B to be attached, such as an automobile body panel, before it is cured, as shown in FIG. In the molded product M, even when used for a long period of time, a coating film P is formed on the surface of the molding body M via a crosslinked thin film, so the crosslinked thin film can absorb plasticizer molecules into the coating film. Since it does not penetrate into the layer side, it will not cause peeling or discoloration of the paint film. In addition, in the molding product M2, the decorative tape T1 can be prevented from being scratched by covering it with the protective tape T2 during extrusion molding, plasma treatment, and painting of the molding body M, so that good decorative properties can be maintained. .

Effects of the Invention As described above, according to the molding production method according to the present invention, a product that can be used for a long period of time can be easily produced because the coating film formed on the outer surface does not peel off or discolor. be able to.

[Brief explanation of drawings]

Fig. 1 is a partial perspective view showing an example of a molding main body that can be manufactured by the method according to the present invention, Fig. 2 is an explanatory view showing the manufacturing process of the molding main body, and Fig. 3 a and b are terminals of the molding main body. An explanatory diagram showing the cutting process, and FIG. 4 is a partial perspective view of the same molding body with a stopper attached to the back surface. Figures 5 and 6 are explanatory diagrams of the process of applying plasma treatment to the molding body, Figure 7 is an explanatory diagram of the process of attaching the end cap to the molding body, and Figure 8 is an explanatory diagram of the process of applying painting to the molding body. 9 is a partial perspective view of a molded product obtained by the method according to the present invention equipped with double-sided adhesive tape, FIG. 10 is an explanatory diagram of the process of peeling off the protective tape from the molded product, and FIG. 11 is This is an explanatory diagram showing the installation state of the molding product. M: Molding body, 20-27 (27'): Plasma treatment device, P: Paint film, TI = Decorative film, T
2. Protective film. Figure 1 Figure 3 Figure 5

Claims (3)

[Claims] (1) A method for producing a molding, which comprises forming the molding body from a soft synthetic resin containing a plasticizer, and then subjecting at least the outer surface of the molding body to low-temperature plasma treatment and painting. (2) The method of manufacturing a molding according to claim 1, wherein the decorative film disposed on a part of the outer surface of the molding body is covered with a protective film and the outer surface is subjected to plasma treatment. (3) The method for manufacturing a molding according to claim 2, wherein the protective film is peeled off after the outer surface is coated.