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As the demand for plastic products for automobiles is higher than that for civilian products, ordinary polypropylene plastics have not been able to meet the requirements for use on automobiles. Therefore, the development and application of modified polypropylene materials have developed rapidly in recent years. Polypropylene is used as the main component and others. Polymer blending is a simple and effective method for polypropylene modification. In general, blending two or more polymers can produce a mixture that combines the properties of these polymers.
(1) Improve low temperature impact resistance. Adding EPDM, polybutylene, butyl rubber, polyisobutylene, EVA, etc. to polypropylene can increase the impact strength of polypropylene, and in particular can increase the low-temperature impact strength of polypropylene.
(2) Improve coloring. Adding PA, PU, ​​polyacrylate, polyester, etc. to polypropylene can improve the coloration of polypropylene.
(3) Improve antistatic properties. Polypropylene has a high degree of insulation, so it is easy to carry static electricity, the effect of adding antistatic agents alone is not significant, such as mixed with polyvinyl alcohol has a good antistatic effect.
(4) Flame retardancy. Polyethylene, like most plastics, can be burned and has a large heat of combustion, which is extremely unfavorable for the application of polypropylene in automobiles. Therefore, flame retardancy is improved by adding a flame retardant.
(5) Fill and strengthen modified polypropylene. Polypropylene filled with talcum powder, mica, calcium carbonate, glass microspheres, etc., can improve the heat resistance rigidity, dimensional stability, etc., but the modification effect does not exceed the performance range of the general resin, but also can not reach the required properties of engineering plastics, Therefore, glass fiber (surface treated and having a high affinity with the resin) may be added to improve heat resistance, dimensional stability, creep resistance, mechanical strength, and the like.
Application and Development of Polypropylene in Automobile Engineering
Polypropylene has a rich source of raw materials, low price, excellent performance, and wide range of uses. At present, the development speed is the fastest among thermoplastics. The amount of each car in the car up to 10 kg ~ 20 kg, up to dozens of varieties of parts. Mainly body parts, ventilation heating system accessories, engine accessories and exterior parts. According to the mounting position of the product on the vehicle, different requirements are imposed on the material of the product. Generally, the material is required to have heat resistance, impact resistance, aging resistance, and high rigidity. Therefore, the indicator can be selected after selecting a certain brand of material, at the same time to consider the cost.