JPS6241140B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a weather strip that is attached to a window frame of an automobile door. Conventionally, weather strips have been used for this type of window frame that holds the window glass in a slidable manner.
For example, there is one shown in FIG. In the figure, 1 is the main body of the weather strip, which is integrally formed by extrusion molding of synthetic resin or rubber, and includes a base 1a that is fitted into the bottom of the sash 2, and a base 1a that is erected at both ends of the base 1a. A pair of side wall portions 1b fitted to both side wall portions of the sash 2, and this side wall portion 1b.
It consists of a lip portion 1c that extends in a curved manner from the end toward the base portion 1a. 3 is a window glass. Further, flocking 4 is applied by electrostatic flocking or the like near the surface of the base portion 1a and the lip portion 1c where the window glass 3 makes sliding contact. In the case of such a weather strip structure, the flocking 4 reduces the sliding resistance against the window glass 3 and provides an appropriate glass holding force, thereby allowing the window glass 3 to slide smoothly. ing. However, this configuration has the disadvantage that the process of applying flocking 4 to the main body 1 of the soft weather strip is complicated, and the cost inevitably increases due to the use of special adhesives and piles. . In addition, there were practical problems in that the flocked hair 4 was easily peeled off and had a short lifespan. On the other hand, in order to improve this drawback, a weather strip has also been provided in which a plurality of protrusions 5 are integrally provided on the surface of the main body 1 of the weather strip that comes into sliding contact with the window glass 3, as shown in FIG. ing. However, although it is advantageous in that it is simple in structure and inexpensive, it has relatively large sliding resistance.
The current situation is that there is still no substitute for flocked hair products. In addition, weather strips coated with silicone-added urethane resin or nylon are also available, but in the case of silicone-added urethane resins, when trying to improve durability, processability such as curing conditions deteriorates. . Furthermore, due to its hygroscopic nature, the nylon coating has had problems such as adhesion to the window glass when the humidity is high. The present invention has been made in view of these conventional problems, and uses a paint in which any of synthetic resins such as vinyl chloride, acrylic, chlorinated polyolefin, urethane, or nylon is dissolved. A colloidal paint is created by stirring and mixing a solvent with low solubility (poor solvent), and this colloidal paint is mixed with another synthetic resin paint of the same type that can form a strong coating film or with a synthetic resin of another type. By applying the paint made by adding the paint to at least the sliding contact surface of the weather strip main body against the window glass, drying and baking it, in other words, the paint creates a colloidal paint and exhibits its adhesion. By combining with the paint that
By making the sliding contact surface into a visually good and durable uneven state and reducing the sliding contact area with the window glass, the sliding contact resistance against the window glass is reduced, and the durability is good and the cost is reduced. The present invention provides a method for surface treatment of automotive weather strips that can be carried out. Embodiments of the present invention will be described below based on the drawings. FIG. 3 shows the process of forming microscopically uneven surfaces on the surface of the weatherstrip body according to the present invention.
First, a paint containing a synthetic resin such as vinyl chloride, acrylic, chlorinated polyolefin, urethane, or nylon is prepared. For example, as shown in FIG. 3a, a container 12 containing a nylon paint 11 dissolved with phenol, formic acid, cresol, or the like is prepared. Next, a solvent having relatively low solubility (poor solvent) is mixed into the paint 11 and stirred. Suitable solvents are, for example, isopropyl alcohol or methanol. In addition,
This poor solvent does not necessarily form the desired colloidal particles for all synthetic resin paints, and in order to form the desired colloidal particles, a solvent selected at random according to the type of synthetic resin paint is used. Currently, we are discovering a solvent that has a good degree of colloidal particle formation. By mixing and stirring isopropyl alcohol or methanol in this way, the inside of the container 12 becomes a state in which aggregated colloidal particles 11b are well-dispersed in the liquid paint 11a containing a poor solvent, as shown in FIG. 3b. . Next, such a colloidal paint with a good degree of colloid particle formation is applied to another nylon-based synthetic resin paint or another type of synthetic resin paint, such as a third synthetic resin paint.
As shown in Figure c, by adding the urethane resin to the paint 14 in the container 13, a colloidal paint containing the urethane resin can be easily obtained, and a strong coating film unique to urethane resin can be obtained. It is possible to take advantage of the property of being formable. The paint thus prepared is applied to the surface of the weather strip main body 1 shown in FIG. 1 that comes into sliding contact with the window glass, resulting in the result as shown in FIG. 3d. Subsequently, by drying and baking the applied paint, the paint 11a, colloidal particles 11b, and paint 14 are integrated on the weather strip main body 1. That is, the colloidal particles 11b are combined with the paints 11a and 14. A microscopically uneven surface 15 as shown in FIG. 3e is formed which is fixed with the coating film. The main body 1 of the weather strip having the uneven surface 15 is shown in FIGS. 4 to 6. 6 is a vehicle body panel. The steps from forming the main body of the weather strip to forming the uneven surface 15 are shown in FIG. 7A.
As shown in the figure, an extrusion process in which a rubber material is extruded into a predetermined shape using an extruder, a vulcanization process in which the molded product is vulcanized in a vulcanizer, and a colloidal paint containing the poor solvent and additive paint. The process consists of applying the rubber material to the main body of the molded weather strip using a coating roll, spray or brush, and after drying, heating and baking at approximately 120℃ for 5 minutes, and applying the rubber material using an extruder. Immediately after the extrusion process of extruding into a predetermined shape,
Primer application and drying step, step of applying colloidal paint to the body of the molded unvulcanized weather strip, and then heating and vulcanization of the extruded uncured weather strip using a vulcanizer. In the case of a weather strip that consists of a process of drying and baking a colloidal paint at the same time, and as shown in Figure 7B, in the case of a weather strip based on thermoplastic synthetic resin, the vinyl chloride material is passed through an extruder. An extrusion process in which the molded product is extruded into a predetermined shape, a process in which the molded product is cooled and hardened using a cooling device, a process in which a primer is applied to the main body of the molded weatherstrip and dried, a colloid containing a poor solvent is A coating process in which the paint is applied to the body of the molded weather strip using a coating roll, and the paint is dried, baked, and baked at approximately 120°C for 5 minutes.
After the process of simultaneously performing annealing, etc., and the extrusion process of extruding and molding the vinyl chloride material into a predetermined shape using an extruder, a primer is immediately applied to the main body of the weather strip, and the vinyl chloride material is extruded. The primer is dried using the heat of the weather strip, and then a colloidal paint is applied to the main body of the weather strip using a coating roll or the like. In this case as well, the paint is dried by the heat during extrusion. Next, after a cooling step in which the vinyl chloride material is cooled and hardened using a cooling device, there is a step in which the paint is baked and annealed at 120° C. for 5 minutes in a baking oven. The primer application and drying steps described in the above steps may be optionally removed. In addition, alcohols with an SP value of 11 or more, such as isopropyl alcohol, can be used as a poor solvent in paints made by mixing and dissolving urethane resin in a solvent with an SP value (solubility parameter) of around 9, such as methyl ethyl ketone, toluene, acetone, or trichloroethylene. When mixed and stirred to form a colloidal paint and added to a urethane-based paint or another different paint, the coefficient of friction is also lower than that of a surface coated with untreated urethane paint. Similar results were obtained when a colloidal paint obtained by mixing paraxylene into a chlorinated polypropylene dissolved in toluene was added to another paint as a chlorinated polyolefin. FIG. 8 shows a method for measuring the coefficient of friction on a glass plate of a sample made of the same material as the weatherstrip body. 31 is the sample 3
A weight 33 with a load of 1000 grams is placed on the glass plate 31, and one end of a thin wire 35 guided by a pulley 34 is connected to the glass plate 31. This thin wire 35 is stretched by a load cell. The dimensions of the paint 32 are 120 mm in length, 40 mm in width, and 2 mm in thickness.
The weight of the robot itself was 115 grams, and the tension speed using the load cell was set to 500 mm/min. The coefficient of friction against the glass plate 31 measured by this method is as shown in Table 1.

[Table] Thus, if the main body 1 of the weather strip with the surface 15 in sliding contact with the window glass is microscopically uneven is attached to the window frame, the sliding resistance against the window glass 3 will be significantly reduced, and the Glass 3 can be opened and closed easily. As explained above, according to the present invention, a solvent having low solubility for the paint is added to a paint in which any of synthetic resins such as vinyl chloride, acrylic, chlorinated polyolefin, urethane, or nylon is dissolved. By mixing, a colloidal paint containing colloidal particles of the synthetic resin with a high degree of formation is produced, and this colloidal paint is used to form a strong coating film with another synthetic resin paint of the same type or with a synthetic resin paint of another type. Since the weather strip was added to a paint that can be formed and applied to at least the sliding contact surface of the weather strip main body against the window glass, dried and baked, compared to the case where the colloidal paint was simply dried and baked, The sliding surface has good microscopic unevenness and is strong, providing appropriate frictional resistance to the window glass, allowing the window glass to open and close more smoothly, and increasing durability. It has a positive effect.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a conventional weather strip mounting structure, Fig. 2 is a perspective view showing another conventional example of a weather strip, Fig. 3 a, b, c,
d and e are process diagrams showing the surface treatment method of the weather strip of the present invention, FIGS. 4 to 6 are cross-sectional views showing the mounting structure of the weather strip subjected to the surface treatment method of the present invention, FIGS. 7A and 7B are process diagrams showing a method for forming a weather strip using the surface treatment method of the present invention, and FIG. 8 is a measurement of the coefficient of friction of the uneven surface formed by the present invention. It is an explanatory diagram showing a method. 1... Weather strip main body, 11... Nylon resin, 11b... Colloidal particles, 14...
Urethane resin paint, 15...Microscopically uneven surface.

Claims (1)

[Claims] 1 A paint in which any of synthetic resins such as vinyl chloride, acrylic, chlorinated polyolefin, urethane, or nylon is dissolved is mixed with a solvent with low solubility for the paint, and colloidal particles of the synthetic resin are mixed. Weather stripping is made by creating a colloidal paint containing the same type of paint, and adding this colloidal paint to another synthetic resin paint of the same type or another type of synthetic resin paint that can form a strong coating film. 1. A method of surface treatment for a weather strip for an automobile, characterized in that the coating is applied to at least the sliding surface of the main body against a window glass, dried and baked to make the sliding surface microscopically uneven.