KR100387656B1 - Solid coating method of weather strip sponge part by extrusion process - Google Patents

Abstract

The present invention relates to an extruded solid-coated material and a method for treating the weather strip sponge tube using the same, and more particularly, to a solid-coated material suitable for the extruded surface treatment for the weather strip sponge tube and a weather strip sponge tube using the coating material. The present invention relates to a weather strip sponge tube surface treatment method in which a thin solid layer is introduced. According to the present invention, not only the appearance beauty of the weather strip sponge tube, but also can improve the wear resistance excellent in compression load and compressive permanent shrinkage, etc., as well as economical and prevent environmental pollution unlike conventional coating liquid surface treatment method It can have an effect.

Description

Solid coating method of weather strip sponge part by extrusion process

The present invention relates to an extruded solid-coated material and a method for treating the weather strip sponge tube using the same, and more particularly, to a solid-coated material suitable for the extruded surface treatment for the weather strip sponge tube and a weather strip sponge tube using the coating material. The present invention relates to a weather strip sponge tube surface treatment method in which a thin solid layer is introduced.

Weather strips for automobiles are parts that seal the body and prevent wind noise, water and dust from entering the vehicle. The weather strip should maintain a uniform and constant surface pressure in order to minimize the force required to open or lower the door or trunk and to open / close the door or trunk while sealing from the external environment. The weather strip is in the form of a rubber solid or sponge foam, and the material used is mainly ethylene-propylene rubber (EPDM) having excellent weather resistance. In addition to ethylene-propylene rubber, a thermoplastic rubber (TPV) material is used. The thermoplastic rubber material has a tendency to be easier to produce and reduce cost than ethylene-propylene rubber. In addition, in weather strips such as glass run channels, the coefficient of friction on the surface has a great influence on the operation of the glass, and silicon or urethane coating is applied to the surface. .

This weather strip is composed of a solid carrier (A) portion and a sponge tube (B) portion as shown in FIG. The double solid carrier part is attached to the body to hold the weather strip, and the sponge tube part prevents the inflow of water, noise and dust from the outside environment into the vehicle by closing the gap between the body and the door. . In particular, the sponge tube part is repeatedly contacted with the vehicle body, and the micro-vibration between the vehicle body and the door causes contamination on the vehicle body painted surface and causes wear on the weather strip. This phenomenon is more severe in a van-type passenger car having a sliding door structure or a vehicle equipped with a diesel engine in which vibrations of a vehicle body are generated. Therefore, in this case, various surface treatment agents have been applied to improve the appearance and wear resistance of this part. In other words, when surface treatment is performed on the weather strip sponge tube part, it is required to wear resistance much like sliding doors, hard tops, and taxis with a lot of passengers getting on and off. It is a trend applied for the improvement, and the silicone type and the urethane type are most applied as such a surface treatment agent.

However, when the silicone surface treatment agent is introduced, it causes environmental pollution and deterioration of working environment due to solvent, and even after application to the product, initial performance is satisfied, but its performance decreases rapidly as the service life increases, and surface bleeding phenomenon and coating liquid There has been a problem of adhesion to the chassis part of the body causing contamination. In addition, the urethane coating application has excellent initial and long-term performance, but requires additional processing such as coating liquid purchase cost, additional processing equipment such as spray gun for coating, and coating drying furnace for coating liquid drying. It leads to cost increase and environmental pollution and deterioration of working environment by solvent. In particular, in recent years to develop a water-soluble coating agent for the prevention of environmental pollution by a solvent, there is still a problem that its physical properties do not reach the level of the existing coating liquid.

Accordingly, there is an urgent need for the development of a new coating method that can improve the appearance and wear resistance of the weather strip sponge tube, as well as economical and prevent environmental pollution, unlike the conventional coating liquid surface treatment method.

Therefore, the nickname of the present invention, as a result of intensive efforts to solve the above problems, developed a coating material for surface treatment by extrusion instead of the surface treatment method by the coating liquid and extruded surface treatment method to the coating material on the weather strip sponge tube The present invention was completed by confirming that there was no environmental pollution while improving appearance and abrasion resistance by introducing into.

After all, the main object of the present invention is to provide an extruded solid-coating material comprising 60 to 70 parts by weight of paraffinic oil and 1.5 to 3 parts by weight of dithiocarbamate or thiazole vulcanization accelerator based on 100 parts by weight of EPDM (raw material). There is.

In addition, another object of the present invention is a triple extrusion method of sponge partial extrusion (A), solid carrier partial extrusion (C) and insert (B) extrusion, the product profile in the extruder (D) profile) temperature is 80 to 88 ℃, the temperature of the Ultra High Frequency (UHF) chamber (E, F) is 240 to 260 ℃, the product surface temperature at the outlet of the UHF chamber (E, F) is 140 to 170 ℃, And the temperature of the hot air vulcanization (HAV) chamber (G, H) is 260 to 280 ℃, the product surface temperature at the outlet of the HAV chamber (G, H) is 230 to 260 ℃, their extrusion speed is 11 to 13m It is to provide an extrusion surface treatment method characterized in that / min.

1 shows the general shape of the weather strip.

Figure 2 shows a cross-sectional structure of the weather strip according to the present invention.

Figure 3 shows an extrusion production process according to the present invention.

Figure 4 is a photograph (10 times, 50 times) of the appearance quality and structure of the weather strip sponge tube produced in Examples and Comparative Examples.

[Description of Symbols for Main Parts of Drawing]

1: sponge tube

2: solid carrier

Hereinafter, the extrusion-type solid-coating material of the present invention and the weather strip sponge tube surface treatment method using the same will be described in more detail.

First, the present invention comprises 60 to 70 parts by weight of paraffinic oil, 0.7 to 1.4 parts by weight of dithiocarbamate vulcanization accelerator and 2.1 to 3.5 parts by weight of thiazole vulcanization accelerator based on 100 parts by weight of ethylene-propylene rubber (EPDM). It features a solid-coating material.

Here, the solid-coated material is particularly important for the viscosity (mooney viscosity), hardness (hardness), contamination and physical properties of the material, the viscosity (mooney viscosity) is ML1 + 4 (125 ℃) 30 to 38, and also Hardness should be 50 to 70, and it is preferable that there is no contamination since it is a part in contact with the painted surface of the vehicle body. Therefore, in order to remove contaminants, a paraffinic oil having no aromatic group, that is, a P-6 oil, is used, and the content thereof is preferably 60 to 70 parts by weight based on 100 parts by weight of EPDM. Because, if the content thereof is less than 60 parts by weight, the extrusion becomes difficult, while in excess of 70 parts by weight there is a problem that can cause contamination by the remaining oil.

In addition, in the present invention, dithiocarbamate accelerators and thiazole accelerators are used to remove contaminants while accelerating vulcanization, and their contents are 0.7 to 1.4 with respect to 100 parts by weight of EPDM, respectively. Parts by weight, 2.1 to 3.5 parts by weight are preferred. At this time, the vulcanization time by these accelerators is quickly adjusted to prevent contamination by the unvulcanized. That is, the vulcanization time measured by the rheometer should be 5 minutes to 6 minutes for the torque value T90 at RHEO (170min) at 170 ° C.

In addition, in the present invention, 60 to 70 parts by weight of carbon black fast extrusion furnace (FEF), 30 to 50 parts by weight of carbon black SRF (Semi Reinforcing Furnace), carbonic acid based on 100 parts by weight of EPDM in order to satisfy the characteristics of the solid-coated material 30 to 35 parts by weight of calcium (CaCO ₃ -L), 4 to 6 parts by weight of zinc oxide (ZnO), 1 to 2 parts by weight of stearic acid, 2.5 to 3.5 parts by weight of polyethylene glycol, 7 to 10 parts by weight of moisture remover Part, and sulfur (S) 1.7 to 2.3 additionally.

In addition, the present invention, as shown in Figure 3, the surface treatment of the weather-stiff sponge tube by the triple extrusion method of sponge partial extrusion (A), solid carrier partial extrusion (C) and insert (B) extrusion The method relates to a sequential process into an extruder, a UHF chamber, and a HAV chamber, wherein the temperature and extrusion rate conditions are as follows.

That is, in the extruded surface treatment method according to the present invention, the product profile temperature in the extruder D is preferably 80 to 88 ° C, and the temperature of the UHF chambers E and F is 240 to 260 ° C and UHF. The product surface temperature at the outlet of the chambers E and F is 140 to 170 ° C, and the temperature of the HAV chambers G and H is 260 to 280 ° C, and the outlet of the HAV chambers G and H is It is preferable that the product surface temperature in () is 230-260 degreeC. In addition, if the extrusion speed is too late, the productivity is lowered, which causes a unit cost increase. If the extrusion speed is too fast, the vulcanization is not complete, which is not preferable because of problems such as shape retention and contamination of the product. It is preferable.

As described above, the weather strip sponge tube according to the present invention is manufactured, wherein the thickness of the solid layer should be within 0.1 to 0.3 mm (see FIG. 2). This is because if the thickness is too thick, the load is very large during compression of the weather strip, so the door feeling is drastically reduced, and the sealing property is also worsened, which is undesirable.

Hereinafter, the present invention will be described in more detail with reference to Examples. However, these examples are only for illustrating the present invention in more detail, it will be apparent to those of ordinary skill in the art that the scope of the present invention is not limited by these examples. .

Examples and Comparative Examples:

To prepare a solid coating material using a conventional method with a composition and content as shown in Table 1, and then prepared a specimen of the weather strip sponge tube in such a way that a gate is formed in the detention to be introduced to the top of the sponge tube. . As a comparative example, specimens of the weather strip sponge tube which were used conventionally were produced and compared. In addition, under the conditions summarized in Table 1, abrasion, compressive load, and compressive permanent shrinkage were respectively measured by a conventional method, and the results are summarized in Table 1 and shown together. In addition, the results of photographing the appearance quality and structure 10 times, 50 times in the magnification is shown in Figure 4, as a result it can be seen that the appearance of the specimen produced by the embodiment is better.

As described in detail above, the present invention relates to an extruded solid coated weatherstrip sponge tube. Therefore, according to the present invention, not only the appearance beauty of the weather strip sponge tube, but also the excellent wear resistance can be improved not only in compression load and compressive permanent shrinkage, but also economical and environmental pollution unlike conventional coating liquid surface treatment method. It shows an effect that can be prevented.

Claims (2)

Extruded solid-coating material comprising 60 to 70 parts by weight of paraffinic oil, 0.7 to 1.4 parts by weight of dithiocarbamate vulcanization accelerator and 2.1 to 3.5 parts by weight of thiazole vulcanization accelerator based on 100 parts by weight of ethylene propylene rubber (EPDM). In the triple extrusion method of sponge partial extrusion (A), solid carrier partial extrusion (C) and insert (B) extrusion, the product profile temperature in the extruder (D) is 80 to 88 ° C. , UHF (Ultra High Frequency) chamber (E, F) temperature is 240 to 260 ℃, product surface temperature at the exit of the UHF chamber (E, F) is 140 to 170 ℃, and hot air vulcanization (HAV) chamber ( The temperature of the G, H) is 260 to 280 ℃, the product surface temperature at the outlet of the HAV chamber (G, H) is 230 to 260 ℃, their extrusion speed is characterized in that the extrusion speed is 11 to 13m / min Surface treatment method.