Automobile sealing strip has the function of filling various gaps between body components
Release time:
2021-02-22
The automobile sealing strip has the function of filling various gaps between body parts. It has the functions of shock absorption, waterproof, dustproof, sound insulation, decoration, etc., which improves the comfort of the driving experience and protects the body. It is mainly used for door leaves, door frames, front and rear windshields, engine covers and trunk covers. It is worth mentioning that many low-end models are only equipped with sealing strips in many locations to save costs. The key to the manufacture of automotive weatherstrip is the material used. Let me introduce the material of the car sealing strip, I hope it will help you.
Automobile sealing stripIt has the function of filling various gaps between body parts. It has the functions of shock absorption, waterproof, dustproof, sound insulation, decoration, etc., which improves the comfort of the driving experience and protects the body. It is mainly used for door leaves, door frames, front and rear windshields, engine covers and trunk covers. It is worth mentioning that many low-end models are only equipped with sealing strips in many locations to save costs. The key to the manufacture of automotive weatherstrip is the material used. Let me introduce the material of the car sealing strip, I hope it will help you.
1, polyvinyl chloride
Polyvinyl chloride (PVC) is a traditional general-purpose plastic. Its aging resistance and rubber feel can be greatly improved by modification. However, due to its poor elasticity, it is mainly used for the clamping of internal and external strips and some sealing strips. Part material. In trucks and agricultural vehicles, PVC is also often used as a body door frame seal. In automobiles, it is usually combined with EPDM as a light-colored accessory.
2, EPDM rubber
EPDM is made by polymerizing ethylene and propylene monomers with a small amount of non-conjugated dienes. Its structure is characterized by the absence of unsaturated double bonds in the main chain of the polymer molecule, but the introduction of unsaturated double bonds in the branches. Therefore, it has excellent weather resistance, heat resistance, ozone resistance, UV resistance, good processability and low compression set. It is the material for the production of sealing strips. At present, most automotive sealing strip materials are based on EPDM as the main raw material.
According to different parts and functions of the sealing strip, in practical applications, vulcanization, protection, reinforcement, operating system materials and special transfer materials (such as colorants and foaming agents) are added to EPDM materials to form dense glue (including black glue and color glue) and sponge glue.
3, thermoplastic elastomer
Thermoplastic elastomer materials (TPE / TPV) are materials developed in recent years. Its structural characteristics are composed of two phases: plastic and rubber. Therefore, it has the characteristics of plastic and rubber to a certain extent. It does not require vulcanization during processing, and it is easy to control the precise cross-section, and the material can be reused under certain conditions, and the pollution to the environment is small. Therefore, designers of the entire vehicle and sealing system are very concerned. However, due to its poor elasticity and large compression set, at the same time, sponge manufacturing technology is not mature enough and expensive, so the amount of use is greatly limited. At present, the main components are used to manufacture window side bars and window guides. With the improvement and perfection of TPE manufacturing technology, its application range will be further expanded.
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