Automotive sealant strip classification and maintenance methods

The automotive sealant tape is one of the most important components of automobiles. It is widely used in doors, windows, bodywork, seats, sunroofs, engine boxes, trunks and other parts. It can produce rubber hinges used to install luggage compartment doors for passenger cars. With other waterproof, sealing and other effects.

Automotive sealant classification:

1, vulcanized rubber sealant

Generally three yuan ethylene propylene material. Excellent overall performance, outstanding ozone resistance, excellent weatherability, good resistance to high temperature and low temperature, outstanding chemical resistance, resistance to various polar solutes, and low relative density. The disadvantage is the large amount of swelling in general mineral oils and lubricating oils, generally dark products. Operating temperature range -60 ~ +150 °C. With its wide scope of application and excellent comprehensive performance, it has been recognized by domestic and foreign industrial enterprises.

2, silicone rubber sealant

Outstanding resistance to high and low temperature, ozone and weathering resistance; excellent hydrophobicity and proper air permeability; unrivalled insulation properties; sanitary grades that meet food hygiene requirements to meet the requirements of various colors. The disadvantage is that the mechanical strength is the worst in the rubber material and it is not resistant to oil. Operating temperature range -100 ~ +300 °C. It can be used in high temperature, cold, ultraviolet radiation and high-rise buildings.

3, neoprene sealant (CR)

Compared with other specialty rubbers, individual performance is worse, but the overall performance balance is good. It has excellent weather resistance, ozone resistance, heat aging resistance, oil and solvent resistance, good chemical resistance, excellent flame resistance, and good adhesion. Poor storage stability, hardenability during storage, and poor cold resistance. Relative density is high. Generally black products. Used in environments with oil, heat, and acid resistance requirements. Operating temperature range -30 ~ +120 °C.

4, nitrile rubber seal

The main features are oil and solvent resistance, but not tolerant to ketones, esters and chlorinated hydrocarbons, etc. The elasticity and mechanical properties are very good. Disadvantages are aging cracks in ozone and oxidation, poor cold resistance and low temperature resistance.

5, thermoplastic elastomer sealant

Has good elasticity and excellent abrasion resistance, good oil resistance, wide adjustable hardness range (Shore A hardness 65-80 degrees), excellent mechanical properties (tensile strength, elongation at break), excellent The cold resistance and chemical resistance of intertwined corrosion, the higher the price of raw materials. Recyclable material. Operating temperature range -60 ~ +80 °C. It is suitable for areas with strong vibration such as earthquake-prone areas, near railways or factories with high-power cranes, and areas with strong ultraviolet radiation.

6, thermoplastic vulcanizate (TPV) sealant

With the flexibility and elasticity of rubber, it can be produced by plastic processing method without vulcanization, and the waste can be recycled and reused. It is a material with a wide range of properties, good heat resistance, cold resistance, relative density, oil resistance, solvent resistance similar to neoprene, resistance to permanent deformation and abrasion resistance is not very good. Operating temperature range -40 ~ +150 °C. Applicable to cold, and high-rise buildings.

7. Plasticized polyvinyl chloride (PPVC) sealant

Materials are cheap and easy to obtain, with corrosion resistance, wear resistance, acid and alkali resistance and various chemical media, resistant to combustion, high mechanical strength; the disadvantage is that with the plasticizer within the system is easy to migrate, become hard and brittle, lose with the extension of time Elasticity, resistance to aging, poor weatherability and low temperature performance. Generally dark products. It is suitable for occasions where the light is not strong, the temperature does not change greatly, and the weather conditions are not bad.

8, surface coating material

The surface of the sealing strip is coated with polyurethane, silicone, PTFE, etc. to replace the traditional surface flocking process. The coated sealing strip has good wear resistance and smoothness, especially the sealing strip after coating the silicone surface layer coating, and the surface friction coefficient is small, which is favorable for sliding of the door and window fan. Suitable for doors and windows with sliding doors, sashes. It is a substitute for traditional siliconized wool tops.

Daily maintenance and use of automotive sealant strips:

1. Check if the seal has large cracks and breaks. If the seal breaks, it can be repaired with an adhesive. In particular, it is easy to repair large cracks by using adhesives for sealing tapes. Of course, if the sealing strip is seriously damaged or has a relatively large degree of aging, it is better to replace it with a new one.

2. After the car owner uses car detergent to clean the door and window sealant, it is better to apply a layer of high-permeability protective agent, which can not only prevent the aging of the sealer but also greatly improve the sealability of the sealer. In addition, the gaps between the sealing strips are easily filled with sand and dust, causing rust. For this purpose, dust and dust should be removed with a brush.

3, in the replacement of the whole body, should be a layer of sealant in the overlap of the weld seam, the thickness of the adhesive layer should be about 1mm, and the adhesive layer shall not have defects such as viscous, air bubbles. 3mm-4mm elastic coating and anti-corrosion coating should be applied on the entire under floor surface and under the front wheel cover. These measures can not only greatly enhance the vehicle's tightness and reduce the rust speed of the body, but also can greatly improve ride comfort.

4. The seal between the door and the car body is a difficult part. The seal requirement is strict, the part that should be sealed is relatively long, the cross-sectional shape of each seal part is not the same, and the door is frequently opened and closed. In the limousine, three lanes, four lanes of seals, and a quadruple-seal construction with the front pillars and the roof side cross-members are installed. This kind of multi-channel seal is generally arranged in the front door seam, in addition to the sealing function, there is the role of car noise insulation.

5. After the window glass is damaged, the owner should check the seal for damage when changing the glass. Since the windows do not always return to their original shape after repair, it is also necessary to ensure that the window glass can be easily sealed or lifted in addition to 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 or the glass tank, the owner can easily pull the seal off by hand.

6. When the car owner changes the roof, he should first apply a layer of conductive sealant at the pressure joint of the roof, and then apply the folded edge glue in the flow sink and joints after welding. This will not only help the car body. The seal can also prevent the car body from causing early corrosion due to water accumulation at the flange weld.

7, the car sunroof is the basic configuration of most family cars. When the sunroof of the car is opened, the rubber seal track is exposed to the air, it is inevitable that dust will accumulate and even run into small gravel. Prolonged use may cause the skylight to deform due to wear and block the drain hole. Therefore, it is very important to apply the lubricant to the track regularly to clear the track.

Although the car sealant is a small part inside the body, it can ensure that the door of the switch is heavy and heavy, and it can also make the car weatherproof, dustproof, heat-insulating and soundproof, and it can decorate the edges of the doors and windows. When the body is subject to vibration and distortion, the sealing strip also acts as a buffer, absorbs shock, and protects the glass. Therefore, car maintenance is not a trivial matter, and any link can not be ignored.