JPS6126948B2 - - Google Patents

Description

[Detailed description of the invention]

TECHNICAL FIELD The present invention relates to a resin composition that is flexible, has low frictional resistance, has excellent abrasion resistance, and is difficult to adhere to other members such as glass or painted sheet metal. Prior Art In general, automotive weather strips such as glass run or glass outer are made of rubber or soft material.
The material is PVC etc. In this case, for the purpose of reducing sliding resistance (friction coefficient), improving wear resistance, and preventing sticking without impairing sealing performance with other parts,
Surface treatments such as flocking with short nylon fibers and painting with urethane paint, silicone paint, etc. are performed.
However, these have complicated treatment processes and high equipment costs.
Therefore, manufacturing costs are high, and sufficient product performance cannot always be obtained. Therefore, instead of flocking or painting, the treatment process has been simplified by coating with a resin composition such as polyethylene or thermoplastic urethane. The adhesion force was not completely satisfied. Purpose of the Invention The present invention has been made to eliminate the above-mentioned defects, and its purpose is to provide a resin composition that has a small coefficient of friction, excellent wear resistance, and has a small adhesion force to other members. It is in. Composition of the Invention In order to achieve the above object, the present invention comprises 100 parts by weight of a thermoplastic elastomer, 5 to 20 parts by weight of silicone oil, 10 to 50 parts by weight of fluororesin powder, and ~100 parts by weight of low melting point polyolefin constitutes the resin composition. Therefore, the characteristics, blending amount, etc. of each of the above-mentioned components will be explained. The thermoplastic elastomer which is the main component of the resin composition of the present invention includes styrene type, urethane type, copolyester type, nylon type, etc., and the type thereof is not particularly limited. The elastomer provides good sealing properties with the mating member due to its appropriate flexibility, and is highly effective as a binder for each component to prevent deterioration in wear resistance. Furthermore, silicone oil has the effect of increasing the lubricity of the resin composition and lowering the coefficient of friction. This silicone oil has poor lubricity when it is less than 5 parts by weight.
If it exceeds 20 parts by weight, workability will decrease, so 5 to 20 parts by weight
Parts by weight are preferred. Similarly, fluorine resin powder also improves lubricity,
Reduces the coefficient of friction. If the amount is less than 5 parts by weight, the effect will be small, and if it is more than 100 parts by weight, the mechanical strength will be significantly lowered, resulting in a problem, so 10 to 50 parts by weight is desirable. Furthermore, when this fluorine resin powder is coated or insert molded onto a different material such as rubber, resin, or metal, it reduces the surface free energy of the resin composition (reduces the surface tension) in the molten state. It has the effect of biting into the surface better and improving adhesion (adhesion). Furthermore, low-melting point polyolefins include polyethylene, polypropylene, copolymers thereof, waxes, etc., and they have the effect of increasing the lubricity of the resin composition, dispersion processability, abrasion resistance, adhesion to rubber, and strength. There is. 10 to 100 parts by weight of this low melting point polyolefin having a melting point of 150° C. or lower is used. Effects of the Invention As is clear from the evaluation results of Examples described below, the resin composition of the present invention, which is composed of the above four components, has a lower friction coefficient and wear resistance compared to the conventional ones (Comparative Examples 1 to 8). It has excellent properties, can reduce the adhesion force to other members such as glass, and has the effect of improving the adhesion force to rubber etc. Therefore, it is suitable for automotive weather strips such as glass runs and glass outerwear. Examples Next, examples of the present invention will be described, but before that, methods for measuring friction coefficient, abrasion resistance, adhesion force, and peeling force (adhesion force) when applied to rubber will be explained. First, the coefficient of friction was measured using a test piece with a square shape of 50 mm on one side, which was prepared by coating the surface of an EPDM rubber base material 2a with a thickness of 2 mm with a resin composition to form a coating film 2b with a thickness of 0.3 mm. Prepare 2. Then, as shown in FIG. 1, the rubber base material 2a side of the test piece 2 is adhered to the bottom surface of the iron plate 1 with double-sided tape, and the coating film 2b side of the test piece 2 is placed on the top surface of the glass plate 3. A load is applied onto the iron plate 1 using the weight 4. Then, the wire 5 fixed to the iron plate 1 is tested every minute by a Tensilon type tensile tester (not shown).
Measured by pulling at a speed of 100 mm. At this time,
The weight is set so that the sum of the weight W1 of the weight 4, the weight W2 of the iron plate 1, and the weight W3 of the double-sided tape is 1 kg. Note that the upper surface of the glass plate 3 is degreased and cleaned using trichlorethylene every time a measurement is performed. The abrasion resistance of the resin composition was tested using a pendulum type abrasion tester (not shown), and the abrasion element was a glass abrasion element with a width of 20 mm, a thickness of 5 mm, and a tip radius of 10 mm, as shown in Figure 2. Child 6 is used. To perform an abrasion resistance test using the above testing machine, first, the surface of a crosslinked EPDM rubber sheet is degreased and cleaned, then a primer is applied, and then a resin composition is coated on the top surface to form a 0.3 mm thick coating film. Height 150
Prepare a test piece with a width of 10 mm and a glass abrasion element 6 pressed against the coating side of this test piece and slide it back and forth with a load of 3 kg (stroke 100 mm, speed 1 time/sec).
It is measured by the number of times the EPDM rubber substrate is slid back and forth until it is exposed. As shown in FIGS. 3 and 4, the device for measuring the adhesion force between the resin composition and other members includes a glass fixing jig 7, a glass plate 8 fitted to the jig 7, and an upper surface of the glass plate 8. Test piece 9 (the test piece 2
A steel plate 10 (60 mm long, 60 mm wide, 2 mm thick) is attached to the rubber base material 9a side of the rubber base material 9a (same as ) with double-sided tape.
and a tensioning jig 12 placed on the upper surface of the iron plate 10 and connected to a tensilon (not shown) via a wire 11. To measure the adhesion force using the above measuring device,
First, the rubber base material 9a side of the test piece 9 is adhered to the iron plate 10 using double-sided tape. And this test piece 9
The coating film 9b side was brought into contact with the top surface of the glass plate 8 on which water droplets were dripped, and a 3 kg weight (not shown) was placed on the iron plate 10. Leave this state in a constant temperature bath at 80°C for 1 hour. Furthermore, take it out of the thermostatic chamber and let it cool in the air.
After leaving it for 30 minutes, the weight was removed and the tensioning jig 12 was pulled through the wire 11 using a tensilon (not shown). The maximum load (Kg) at this time is taken as the fixing force. Next, a tensile tester is used to measure the peeling force when coating the resin composition on the EPDM rubber base material 9a to form the coating film 9b. In this case, the test piece 9 is formed to have a length of 50 mm and a width of 5 mm, and the peel strength (Kg/cm) when the coating film 9b is peeled off from the rubber base material 9a is measured. In addition, when the coating film 9b breaks, a cloth with low elasticity is bonded to the surface of the coating film 9b of the test piece 9 with an adhesive to reinforce it. Now, Table 1 shows the component formulations of Comparative Examples 1 to 4 and Examples 1 to 2 based on thermoplastic urethane elastomers, and blank columns indicate no addition. Table 2 shows the evaluation results of Comparative Examples 1 to 4 and Examples 1 and 2. As is clear from Table 2, Comparative Examples 1 to 4 do not satisfy any of the four properties of friction coefficient, wear resistance, adhesion force, and peeling force, but Examples 1 and 2
Both satisfy all of the above four properties.

【table】

[Table] Table 3 shows the component formulations of Comparative Examples 5 to 8 and Examples 3 and 4 based on polyamide elastomer,
Table 4 shows the evaluation results. As is clear from Table 4, Examples 3 and 4 satisfy all four properties of friction coefficient, wear resistance, adhesion force, and peeling force, but Comparative Examples 5 to 8 satisfy any of these properties. Not satisfied.

【table】

[Table] Next, Examples 5 to 8 shown in Table 5 will be described. Examples 5 and 6 are based on thermoplastic urethane elastomer, and Examples 7 and 8 are based on nylon elastomer. Further, in Examples 5 to 8, molybdenum disulfide was added, although it is not an essential requirement of the present invention. This molybdenum disulfide has the effect of increasing the lubricity of the resin composition, but
It is desirable that the amount added be 1 to 50 parts by weight. The evaluation results of these Examples 5 to 8 are shown in Table 6, and it can be seen that the friction coefficient and adhesion force are further improved compared to Examples 1 and 3 described above. Finally, Table 7 shows specific examples of each component used in each of Examples 1 to 8 described above.

【table】

【table】

【table】

【table】 [Brief explanation of the drawing]

Fig. 1 is a front view showing the friction coefficient measuring device, Fig. 2 is a perspective view of a glass abrasion element used in a pendulum type abrasion tester, Fig. 3 is a front view showing the adhesion force measuring device, Fig. 4 is also a plan view.

Claims (1)

[Claims] 1 100 parts by weight of thermoplastic elastomer, and 5 to 100 parts by weight of thermoplastic elastomer
20 parts by weight of silicone oil, 10 to 50 parts by weight of fluororesin powder, and 10 to 100 parts by weight of melting point 150℃ or less
1. A resin composition comprising: parts by weight of a low melting point polyolefin.