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Automobile sealing strip is one of the important parts of automobiles. It is widely used in doors, windows, body, seats, sunroofs, engine boxes and trunks. It can be used to produce rubber hinges for installing passenger car luggage compartment doors. It has other functions such as waterproof and sealing.

classification of automotive sealant:

1. Vulcanized rubber sealant strip

General EPDM material. Excellent overall performance, with outstanding ozone resistance, excellent weather resistance, good high temperature and low temperature resistance, outstanding chemical resistance, ability to withstand a variety of polar solutes, relative density is small. The disadvantage is that the amount of expansion in general mineral oil and lubricating oil is large, and it is generally dark products. Use temperature range -60~150 ℃. With its wide application range and excellent comprehensive performance, it has been recognized by domestic and foreign industry enterprises.

2. Silicone rubber sealing strip

It has outstanding high and low temperature resistance, ozone resistance and weather resistance; it has excellent hydrophobicity and proper permeability; it has unparalleled insulation performance; it can reach the hygienic level of food hygiene requirements and can meet the requirements of various colors. The disadvantage is that the mechanical strength is the worst among rubber materials and is not resistant to oil. Use temperature range -100~300 ℃. Can be applied to high temperature, cold, strong ultraviolet radiation areas and high-rise buildings.

3. Neoprene sealant strip (CR)

Compared with other special rubber, the individual performance is worse, but the overall performance is well balanced. It has excellent weather resistance, ozone resistance, heat aging resistance, oil and solvent resistance, good chemical resistance and excellent flame resistance, and good adhesion. The storage stability is poor, the hardening phenomenon will occur during storage, and the cold resistance is not good. The relative density is larger. Generally black products. Used in oil resistance, heat resistance, acid and alkali resistance requirements of the environment. Use temperature range -30~120 ℃.

4. Nitrile rubber sealing strip

The main features are oil resistance, solvent resistance, but not resistant to ketones, esters and chlorinated hydrocarbons and other media, elastic and mechanical properties are very good. The disadvantage is that it is easy to age and crack in ozone and oxidation, and its cold resistance and low temperature resistance are poor.

5. Thermoplastic elastomer sealant strip

It has good elasticity and excellent wear resistance, good oil resistance, wide adjustable hardness range (Shore A hardness 65~80 degrees), superior mechanical properties (tensile strength, elongation at break), excellent cold resistance and chemical interweaving corrosion resistance, high price of raw materials. Materials that can be recycled. Use temperature range -60~80 ℃. It is suitable for earthquake-rich areas, areas with strong vibration such as railways or factories with high-power cranes, and areas with strong ultraviolet radiation.

6. Thermoplastic vulcanizate (TPV) sealant strip

With the flexibility and elasticity of rubber, it can be produced by plastic processing methods without vulcanization, and the waste can be recycled and reused. Is a wide range of performance materials, heat resistance, cold resistance is good, relative density is small, oil resistance, solvent resistance and neoprene similar, compression permanent deformation and wear resistance is not very good. Use temperature range -40~150 ℃. Can be applied to cold, as well as high-rise buildings.

7. Plasticized polyvinyl chloride (PPVC) sealant strip

The material is cheap and easy to obtain, with corrosion resistance, wear resistance, acid and alkali resistance and all kinds of chemical media, combustion resistance, high mechanical strength; The disadvantage is that the plasticizer in the system is easy to migrate, become hard and brittle with the extension of time, lose elasticity, aging resistance, poor weather resistance and low temperature performance. Generally dark products. It is suitable for occasions where the light is not strong, the temperature changes little, and the climatic conditions are not bad.

8. Surface coating materials

It is coated with polyurethane, silicone, polytetrafluoroethylene and other substances on the surface of the sealing strip to replace the surface flocking of the traditional process. The coated sealing strip has good wear resistance and smoothness, especially the sealing strip coated with silicone surface coating, the surface friction coefficient is small, which is conducive to the sliding of doors and windows. Suitable for doors and windows with sliding doors and sashes. It is a substitute for traditional siliconized wool.

Daily maintenance and use skills of automobile sealing strip:

1, check the sealing strip for large cracks, whether there is fracture. If the sealing strip is broken, it can be repaired with adhesive. In particular, the use of special adhesive sealing strip, it is easy to make up the large crack strip. Of course, if the sealing strip is seriously damaged or aged, it is better to replace the new sealing strip.

2. After the car owner uses car detergent to clean the door and window sealing strip, it is best to coat a layer of highly permeable protective agent, which can prevent the aging of the sealing strip and greatly improve the sealing of the sealing strip. In addition, the gaps between the sealing strips are easily filled with sand and dust, which causes corrosion. To this end, you should use a brush to remove dust and other clean.

3. When replacing the entire body, a layer of sealant should be applied to the overlapping part of the weld. The thickness of the adhesive layer should be about 1mm, and the adhesive layer should not have defects such as virtual adhesion and bubbles. The lower surface of the entire floor and the lower surface of the front wheel cover shall be coated with 3mm-4mm elastic coating and anti-corrosion coating. These measures can not only greatly enhance the sealing of the vehicle and slow down the corrosion rate of the body, but also greatly improve the ride comfort.

4. The sealing between the door and the body is a relatively difficult part. The sealing requirements are relatively strict. The part that should be sealed is relatively long. The cross-sectional shape of each sealing part is different, and the door is frequently opened and closed. In high-end cars, 3 and 4 seals are often installed, and the quadruple seal structure of the front pillar and the roof side beam is installed. This kind of multi-channel seal is generally arranged in the front door seam. In addition to the sealing function, it also has the function of sound insulation and noise reduction.

5. After the window glass is damaged, when the owner changes to the glass, check whether the sealing strip is damaged. Since the windows often fail to return to their original shape after repair, in addition to ensuring that the window glass can be easily pulled or lifted, attention should also be paid to the sealing around the window glass. If the gap between the glass and the glass notch is uneven, and the rubber strip is in poor contact with the glass and the glass groove, the owner can easily pull the sealing strip off by hand.

6. When changing the roof, the car owner should first apply a layer of conductive sealant on the pressing part around the roof, and then apply the hem glue in the flow groove and the joints after welding, which will not only help the body The seal can also prevent early corrosion of the car body due to water accumulation at the flanging welds.

7. Car sunroof is the basic configuration of most family cars. When the car sunroof is opened, the rubber sealing strip track is exposed to the air, which will inevitably accumulate dust and even run into small gravel. Prolonged use may cause the sunroof to deform due to wear and block the drain hole. Therefore, it is very important to clean the track regularly and apply lubricating oil to the track.

Although the car sealing strip is a small part in the car body, it can ensure that the door is stable and heavy, and it can also protect the car from wind and rain, dustproof, heat insulation, and sound insulation, and has a decorative effect on the edges of doors and windows. When the body is subjected to vibration and distortion, the sealing strip also plays the role of buffering, shock absorption and protecting the glass. Therefore, car maintenance is no small matter, any link can not be ignored.