KR20030091391A - Weatherstrip for automobile - Google Patents

Abstract

PURPOSE: A weather strip for a vehicle is provided to obtain an active sealing system for controlling active sealing performance according to a change of vehicle speed and securing long-term sealing performance by uniformly maintaining face pressure for a door. CONSTITUTION: An active sealing system controls active sealing performance according to a change of vehicle speed and secures long-term sealing performance by uniformly maintaining face pressure for a door. In the active sealing system, a pressure sensor to measure the pressure difference of the room according to the vehicle speed and a speed sensor to sense the speed of a vehicle are mounted to the vehicle, and then an actuator is mounted to the inside of the door, to adjust the quantity of the air in a weather strip.

Description

Weather strip for vehicles {WEATHERSTRIP FOR AUTOMOBILE}

The present invention relates to an active sealing system of the automotive weather strip and a strip material, and more particularly, to maintain a constant surface pressure on the door to control the active sealing property according to the change in vehicle speed and to ensure long-term sealing performance. In the sealing system, a pressure sensor for measuring the pressure difference in the room according to the speed of the vehicle and a speed detecting sensor for detecting the speed of the vehicle are mounted on the vehicle, and then the actuator is mounted inside the door to be mounted in the weather strip. For application to weatherstrip active sealing systems and weatherstrip active sealing systems to control the air volume, polybutadiene, carbon black, paraffinic oils, silica fillers, binders, softeners, anti-aging agents, accelerators, and sulfur are constant It relates to a resin composition contained in the content. With the introduction of the active sealing system, semi-permanent sealing performance can be secured, common parts and simplification can be achieved, quality stability and color can be diversified, and odors generated in the vehicle and contamination of paint surfaces can be eliminated.

Weather strip for automobile is a part that seals the body and blocks wind noise, water and dust from getting inside the vehicle. Specifically, as shown in FIGS. 1A and 1B, the weather strip is composed of a soft area and a hard area. The soft area is a part that determines airtightness, and a sponge or soft molten rubber material is formed in the form of a tube. Applied, the hard area serves to fix and support the tube part 1 which influences the airtightness, and is usually called the trim part 2. The trim part 2 is composed of two opposing leg parts and a base part connecting them, and has a shape of a channel, and when applied to a vehicle body, left and right inserting force, detachment force, holding force for maintaining a mounting shape, etc. That's the part. That is, the lip portion 3 of the finger shape protrudes inwardly from two opposing leg portions, and when introduced into the vehicle body, it is fixed by the frictional force with the flange 4 of the vehicle body. In the case of the weather strip currently applied, the steel core part 5 is applied to the core part in order to maintain the shape of the trim part 2. However, in this case, an additional step of separating and bending the steel core 5 is required, and the protrusions generated in the trim 2 are a major cause of deterioration in appearance quality. In addition, lack of restoring force and rust generation of the steel core (5) leads to a decrease in airtightness, recyclability is also reduced because the steel core (5) must be removed separately during recycling.

The weather strip should seal the external environment and minimize the load or glass lifting force required to open and close the door or trunk. Accordingly, it is necessary to maintain a uniform and constant surface pressure, to exhibit a constant sealing function in the long term, and to have a small permanent deformation rate of the sealing part. At present, many efforts are being made to solve the problem of the weather strip, and the direction of progress is to replace the existing steel material with TPE (Thermoplastic Elastomer) and the corresponding material, and to harden the entire rubber part without the core. It can be represented by a method of replacing with a material.

Conventionally, the weather strip meets the above requirements mainly through the passive sealing system (PASSIVE SEALG SYSTEM) through the method of changing the sealing cross-sectional shape of the weather strip and the high durability of the material itself.

The sealing method of the weather strip based on the passive sealing system described above presents various problems.

1. Active response to external environments that change depending on conditions when driving a vehicle is impossible

2. Permanent deformation of the weather strip rubber due to the extension of the service life causes a deterioration of the sealing performance.

3. Excessive development period and sealing performance difference by section due to the application of multiple individual sections for each vehicle type

4. Difficulty of simultaneous improvement of the two performances due to the opposite performance phenomenon between the door peeling and sealing properties.

5. Deterioration of appearance by color introduction of weather strip rubber and difficulty of surface treatment

6. Degradation of finished vehicle's merchandise due to contamination

7. Difficulty in coping with the difference in performance and smell by product production lot by applying rubber

Therefore, as an alternative to the above problems, a lot of researches on the active sealing system (ACTIVE SEALG SYSTEM) in recent years, but this also has difficulty in the material development as well as the design aspect of the system.

Currently, rubber such as EPDM is widely used as a weather strip material of an active sealing system. As the material is manufactured by the foaming process, fouling by the chemical blowing agent occurs, resulting in a decrease in the working environment. In addition, the foaming gas is present inside the weather strip foaming cell, which causes disgusting odors in the vehicle compartment when mounted on the vehicle, resulting in deterioration of emotional quality. In addition, the appearance of the uneven part of the surface of the weather strip due to the foaming is reduced in appearance quality and extruded at the same time during the production process, so that foaming occurs, so there is a problem of excessive dimensional dispersion of the product for each lot of production. In addition, in case of the final ASSY of the product, appearance quality deteriorates due to the step difference between the extruded part and the molded part and the occurrence of discoloration during the connection molding of the extruded part, and the foaming should be performed simultaneously with the injection molding when connecting the extruded part. Therefore, a fast vulcanization system is applied, so a lot of combination drugs are needed. Accordingly, the movement of the chemicals to the surface due to the compatibility of the chemicals between the chemicals is caused to cause contamination of the coating surface, and the cost of the compounding due to the excessive application of various formulations remains a problem.

Thus, the inventors of the present invention tried to develop a material suitable for the active sealing system, as a result of producing a resin composition for the weather strip containing a polybutadiene and containing a certain amount of various additives therein, the composition is excellent in physicochemical properties It is possible to apply to the sealing system, thereby maintaining a constant surface pressure on the door at all times and to find out that it is possible to control the active sealing according to the change in vehicle speed to complete the present invention.

An object of the present invention is to provide an active sealing system (ACTIVE SEALG SYSTEM) to maintain a constant surface pressure on the door to ensure active sealing control and long-term sealing performance according to the change in vehicle speed.

In addition, another object of the present invention is to install a pressure sensor that can measure the pressure difference in the room according to the speed of the vehicle and a speed sensor to detect the speed of the vehicle in the vehicle, the actuator is mounted inside the door weather It is to provide an active sealing system of the weather strip to control the amount of air in the strip.

Another object of the present invention is to provide a material suitable for the weather strip active sealing system.

In addition, another object of the present invention is to provide a weather strip material excellent in abrasion resistance to withstand repeated opening and closing sections of the door, soft to low hardness and excellent elasticity.

In addition, another object of the present invention is to provide a weather strip material capable of introducing vivid colors and less pollutants as well as the generation of unpleasant odors, thereby improving the quality of automobile sensitivity.

Figure 1a is a perspective view showing a typical vehicle weather strip

FIG. 1B is a cross-sectional view of FIG. 1A

[Description of Symbols for Main Parts of Drawing]

1 tube portion 2 trim portion

3: lip 4: flange

5: core 6: air hole

The present invention provides an active sealing system that maintains a constant surface pressure on the door to ensure active sealing control and long-term sealing performance according to vehicle speed changes.

After installing a pressure sensor that can measure the pressure difference in the room according to the speed of the vehicle and a speed sensor that can detect the speed of the vehicle, the actuator is mounted inside the door to adjust the air volume in the weather strip. Provides an active sealing system of the weather strip.

In addition, the present invention is applied to the weather strip active sealing system,

15 to 25 parts by weight of carbon black (FEF), 10 to 20 parts by weight of carbon black (HAF), 2 to 5 parts by weight of paraffinic oil, 10 to 20 parts by weight of silica filler, and a binder, based on 100 parts by weight of polybutadiene. 3 to 7 parts by weight, 5 to 10 parts by weight of softener, 3 to 4.5 parts by weight of anti-aging agent (e.g. TMDQ, IPPD), 1 to 3 parts by weight of accelerator (e.g. CBS, MBTS, TMTD), and sulfur It provides the resin composition in which 1-2 weight part is contained.

Hereinafter, the present invention will be described in more detail.

The active sealing system of the present invention measures the pressure difference in the room according to the speed of the vehicle and electronically controls the amount of air remaining in the weather strip tube, thereby maintaining a constant surface pressure on the door at all times, thereby enabling active sealing according to the change in vehicle speed. Control and long-term sealing performance.

As the vehicle travels, air flow occurs along the exterior of the vehicle. As the speed increases, the flow becomes faster. As a result, the pressure difference between the inside and the outside of the traveling vehicle increases. That is, the pressure in the interior of the vehicle is reduced, and the gap between the interior and exterior of the vehicle, that is, the gap between the door and the body, is gradually widened to achieve a pressure balance inside and outside the vehicle. Therefore, this is the reason why noise suddenly occurs when the car, which is quiet at low speed, runs at high speed.

The operating principle of the system of the present invention is that the vehicle is equipped with a pressure sensor that can measure the pressure difference in the room according to the speed of the vehicle and a speed detection sensor that can detect the speed of the vehicle, and then the actuator (ACTUATOR) inside the door By mounting on, the signal transmitted from the sensor is recognized by the actuator to adjust the amount of air in the weather strip according to the speed and pressure change of the vehicle. Accordingly, the surface pressure on the door is kept constant at all times, and active sealing control according to the change in the vehicle speed becomes possible.

However, in order to apply the active sealing system of the present invention to a vehicle, a suitable material must be developed accordingly.

The weather strip required for the active sealing system according to the present invention must satisfy the following requirements.

1) Low air permeability keeps the air volume in the weather strip constant.

2) It has excellent wear resistance and must endure repeated opening and closing of door.

3) Low hardness, soft and good elasticity.

4) Low glass transition temperature and Tg (Glass transition temperature) should not have the disadvantage of hardening at low temperature.

5) It is possible to introduce vivid colors and show excellent appearance quality.

6) Because of low pollution, it should not cause deterioration of commercial vehicle body.

7) It should not cause unpleasant odors and lower the emotional quality of the vehicle interior.

EPDM (ETHYLEN-PROPYLEN-DIENE-RUBBER) is used as a material for the conventional weather strip sealing portion, but when the EPDM is applied to the system of the present invention, it is difficult to satisfy the requirements described above.

In order to develop a material suitable for the active sealing system of the present invention, the present inventors used polybutadiene (POLYBUTADIENE) as a base polymer instead of EPDM.

Polybutadiene has a CIS-1.4 content of 94% or more, excellent wear resistance, rebound elasticity, aging resistance and water resistance, and a glass transition temperature (Tg) of about 100 ° C., thus exhibiting no degradation at low temperatures.

However, by adopting the polybutadiene, it is possible to solve various problems caused in the case of the conventional foam type by the application of the non-foam type.

Carbon black is added for weather strip to obtain a certain level of mechanical properties, and 15 to 25 parts by weight and 10 to 20 parts by weight of FEF (Fast Extruding Furnace) and HAF (HIGH ABRASION FURNACE) are added to 100 parts by weight of polybutadiene. . In particular, in the case of the prior art, the SRF (SEMI-REINFORCING FURNACE) was applied to increase the overall weight rather than the physical reinforcement aspect, and the main purpose was to reduce the cost, whereas in the present invention, HAF (HIGH ABRASION FURNACE) was applied to 15PHR to provide sufficient abrasion reinforcement. FEF (FAST EXTRUSION FURNACE) was introduced for processability.

Paraffin-based oil was added in a minimum amount compared to the conventionally added excess to limit the content to 2 to 5 parts by weight in order to maximize the properties of the raw materials and increase the efficiency in processing.

In addition, in order to prevent the deterioration of aging properties, the vulcanizing agent (COUPLING AGENT) was introduced to increase the vulcanization content and to minimize the sulfur content to apply the E.V vulcanization system. The amount of the binder was limited to 3 to 7 parts by weight based on 100 parts by weight of polybutadiene in consideration of the degree of vulcanization controlling the physical properties of the final product.

In addition, as additives, 10 to 20 parts by weight of silica filler, 5 to 10 parts by weight of softener, 3 to 4.5 parts by weight of antioxidant, and 1 to 3 parts by weight of accelerator are further added.

The additives may be preferably used as commonly used in this field, the kind is not particularly limited in the present invention. In the embodiment of the present invention, CBS (N-cyclohexyl-2-benzothiazly sulfenamide), MBTS (Dibenzothiazyl disulfide), TMTD (Tetra methylthiuram disulfide) were used as the accelerator, and TMDQ (2,2,4-TRIMETHYL-) as an antioxidant. 1,2-DIHYDRO QUINOLINE POLYMER) and IPPD (TETRA METHYLTHIURAMDISULFIDE) were used.

In addition, the weather strip resin composition of the present invention contains 1-2 parts by weight of sulfur based on 100 parts by weight of polybutadiene for vulcanization.

Therefore, the weather strip manufactured by using the above-described composition is preferably introduced into the system for electronically controlling the amount of air remaining in the weather strip tube portion by the electromagnetic sensitive air injection according to the present invention so that the surface pressure of the door is kept constant at all times. It exhibits semi-permanent sealing property by this. This sealing performance prevents the long-term degradation of the currently applied weather strip, thereby deepening the permanent deformation of the rubber over time, reducing the elasticity can solve the problem of not showing a constant surface pressure on the door.

Although this invention is demonstrated based on an Example, this invention is not limited by an Example.

Example 1 and Comparative Example 1

To prepare the weatherstrip resin composition, each component was prepared as shown in Table 1 below, and then the weatherstrip resin composition was prepared by a conventional method.

Compounding agent (part by weight) Example 1 Comparative Example 1 Raw materials EPDM - 100 butadiene 100 - C / BLACK SRF - 80 FEF 20 - HAF 15 - Silica filler 12 12 Paraffinic oil 2.0 60 Binder 5 - Dimensional stabilizer - 3 Softener 7 7.5 Anti aging agents TMDQ 2 - IPPD 2 sulfur One 3 accelerant CBS 1 MBT 1.3 MBTS 0.2 ZnBDC 0.9 TMTD 0.1 DPG 1.1 CBS: N-CYCLOHEXYL-2-BENZOTHIAZYL SULFENAMIDEDPG: DIPHENYLGUANIDINEEPDM: ETHYLENE PROPRYLEN DIENE RUBBERFEF: FAST EXTRUSION FURNACEHAF: HIGH ABRASION FURNACEIPPD: N-ISOPRPYL-P-PHENYLENE NZENE TRIMETHYL-1,2-DIHYDRO QUINOLINE POLYMERTMTD: TETRA METHYLTHIURAMDISULFIDEZnBDC: ZINC DI-N-BUTYLDITHIOCARBAMATE

As shown in Table 1, in the comparative example, the ratio of the filling system and the oil to the base polymer material is 100: 92: 60, and the concept of the increase rather than the concept of reinforcement is applied, resulting in deterioration of physical properties. In the case of the embodiment was applied in a ratio of 100: 47: 2 was applied to the minimum amount of oil in order to maximize the characteristics of the raw material and increase the efficiency in processing. In the case of other fillers, binders, anti-aging agents, and the like were newly added as compared to those of the comparative example, and it was found that the content of sulfur was minimized.

Experimental Example 1

In order to measure the physical properties of the obtained resin composition, a specimen was prepared and then measured according to each standard, and the results are shown in Table 2 below.

Example 1 Comparative Example 1 Remarks Hardness (Hs) 50 55 Record value after 5 seconds MODULUS 100 20.15 17.2 SPEED 500 mm / min The tensile strength 266 251 Elongation 630 512 Tear strength 51 38 Aging Characteristics Hardness change +2 +5 After 70 ℃ × 72hr aging Tensile Strength Change -4% + 15% Elongation change -3% -14.04% Wear rate (%) 5% 30% AKRON TYPE TEST Volume change rate -0.5% -65% Pressure: 10kgf / cm ² 70 ℃ × 72hr Aging Compression set 14% 27% 70 ℃ × 72hr Aging Ozone resistance NO CRACK NO CRACK 50pphm × 40 ℃ × 72hr Pollution resistance No pollution Yellow discoloration 500g × 80 ℃ × 72hr

According to Table 2, the resin composition of the present invention is very soft compared to that of the comparative example, the physical properties are very good, the rate of change of aging characteristics is very small, there is little change in performance even after long-term use, it is excellent in wear resistance It can be seen. In particular, vans with sliding doors can prevent deterioration in appearance quality due to abrasion, and have excellent permanent reduction rate, so you can expect constant sealing performance even after long-term use. The problem of paint surface contamination that is a problem is also superior to the comparative example.

Accordingly, the active sealing system of the present invention is an important item because the air permeability of the material for the weather strip is very important because the control of the air volume of the weather strip according to the speed change of the vehicle is the main concept. In particular, after applying the air pressure of 10kgf / ㎠ to the test piece as shown in Table 2, the air permeability is very severe as -65% in the case of the conventional products, while the composition of the present invention is -0.5% It can be seen that is the optimal material with little.

Therefore, when the active sealing system using the new material of the present technology is applied, the residual air pressure on the door is kept constant at all times because the remaining air volume of the W / STRIP TUBE is controlled electronically by the electromagnetic sensitive air injection. Can exhibit semi-permanent sealing performance.

Accordingly,

1) Active SEAL control is possible due to vehicle speed change and external environment change;

2) Semi-permanent SEAL performance is possible;

3) common and simplified parts;

4) diversification of quality stability and color; And

5) Eliminates odor and paint surface contamination inside the vehicle.

Claims (2)

In the active sealing system to maintain a constant surface pressure on the door to ensure active sealing control and long-term sealing performance according to the change in vehicle speed, After installing a pressure sensor that can measure the pressure difference in the room according to the speed of the vehicle and a speed sensor that can detect the speed of the vehicle, the actuator is mounted inside the door to adjust the air volume in the weather strip. Weatherstrip's active sealing system. In automotive weatherstrip materials for application in active sealing systems, 15 to 25 parts by weight of carbon black (FEF), 10 to 20 parts by weight of carbon black (HAF), 2 to 5 parts by weight of paraffinic oil, 10 to 20 parts by weight of silica filler, and a binder, based on 100 parts by weight of polybutadiene. 3-7 weight part, 5-10 weight part of softeners, 3-4 4.5 weight part of anti-aging agents, 1-3 weight part of accelerators, and 1-2 weight part of sulfur are contained.