Polypropylene is rich in raw materials, low in price, excellent in performance, and widely used. The current development speed is the fastest in thermoplastics. The amount of each car in the car is 10 kg to 20 kg, and the number of parts can reach dozens. 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, after the indicator is determined, a certain brand of material can be selected, taking into account the cost.
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 the mainstay 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 to automobiles. Therefore, flame retardancy is improved by adding a flame retardant or the like.
(5) Fill and reinforce 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 general-purpose resins, and 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.
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