The use of engineering plastics in the automotive industry
Nylon is mainly used in automotive engines and engine peripheral components. The main varieties are GF-PA6, GF-PA66, and reinforced flame retardant PA6.
(1) Application on peripheral parts of automobile engines
Since the peripheral components of the engine are mainly heat-generating and vibrating components, most of the materials used for the components are glass-reinforced nylon. This is because nylon has a good overall performance. The main properties of nylon modified with glass fiber are greatly improved, such as strength, product precision, dimensional stability, etc. In addition, nylon has many varieties, is easy to recycle and recycle, and the price is relatively cheap. These factors make nylon an ideal choice for engine peripheral components. Intake manifold is the most typical application of modified nylon in automobiles. In 1990, BMW Motors of Germany first applied the intake manifold made of glass fiber reinforced nylon as a six-cylinder engine; later, Ford and DuPont The company cooperated and applied the intake manifold made of glass fiber reinforced PA66 to the V6 engine. After the world's major automobile companies followed suit, the modified nylon intake manifold was widely used.
(2) Application on automotive engine components.
Modified parts such as engine cover, engine cover and cylinder head cover are generally made of modified nylon. Compared with metal materials, the cylinder head cover is reduced in weight by 50% and the cost is reduced by 30%. In addition to engine components, reinforced nylon, such as oil filters, wipers, radiator grills, etc., can also be used for other force components of the car.
In the automotive industry, PBT is widely used in the production of bumpers, carburetor assemblies, fenders, spoilers, spark plug terminal plates, fuel supply system components, instrument panels, automotive igniters, accelerators and clutch pedals. PBT and enhanced PA, PC, POM competition in the automotive industry is very fierce, PA is easy to absorb water, PC heat resistance is not as good as PBT; in automotive applications, because PBT is better than PA, Will gradually replace PA,. In the case of relatively high relative humidity and very humid, the plasticity is likely to be lowered due to moisture, and corrosion is easily caused at the electrical node, and the modified PBT can often be used. At 80 ° C, 90% relative humidity, PBT can still be used normally, and the effect is very good.
PBT/PC alloy is the most widely used in high-class cars: it has good heat resistance, stress crack resistance, excellent wear resistance, chemical resistance, high low temperature impact strength, easy processing and good coating properties. High-end car bumpers, car floor, panels and motorcycle guards.
The automotive industry is the largest potential market for POM. POM is light in weight, easy to process and form, low in production cost, and similar in material properties to metals. Modified POM has low wear resistance and strong rigidity; it is very suitable for manufacturing automotive pumps, carburetor components, oil pipelines, power valves, upper bearings, motor gears, cranks, handles, instrument panels, and automotive window lifts. , electric switch, seat belt buckle, etc. The manufacture of wear parts such as bushings, gears and sliders is the strength of the modified POM. These parts have low metal wear, reduce the amount of lubricating oil and enhance the service life of the parts. Therefore, it can widely replace copper, zinc and other metal production bearings. , gears, levers, etc. POM's automotive parts are lighter in weight, low in noise, and easy to assemble and assemble, making them more and more widely used in the automotive industry.
Modified PC is mainly used for exterior parts and interior parts in automobiles due to its high mechanical properties and good appearance. The most widely used are PC/ABS alloy and PC/PBT alloy.
(1) Automotive interior parts PC/ABS alloy is the most suitable material for automotive interior parts. This is because the PC/ABS alloy has excellent heat resistance, impact resistance and rigidity, and good processing fluidity. It is also an ideal material for the manufacture of automotive dashboards. The heat distortion temperature of PC/ABS alloy is 110 °C ~ 135 °C, which can fully meet the heating requirements of parking in the hot summer at noon in tropical countries. PC/ABS alloy has good coating properties and adhesion to the cover film. Therefore, the instrument panel made of PC/ABS alloy can be directly sprayed with a soft top coat or a PVC film without surface pretreatment. PC/ABS alloys are also used to manufacture automotive parts such as automotive dashboard components, antifreeze panels, door handles, sloping panels, brackets, steering column jackets, trim panels, and air conditioning system accessories.
(2) Automotive exterior parts PC/PBT alloy and PC/PET alloy not only have high heat resistance and high impact of PC, but also have chemical resistance, wear resistance and molding processability of PBT and PET, so they are manufactured. The ideal material for automotive exterior parts. PC/PBT car bumpers can withstand low temperature impacts below -30 °C. When the bumper breaks, it is ductile fracture without debris. Elastomer toughened PC/PBT alloy and PC/PET alloy are more suitable for automobile body panels, automotive side panels, fenders, car door frames, etc. The injection molded exterior parts of the high heat resistant PC/PBT alloy and PC/PET alloy can be dispensed without painting. PC/PET alloys can be used to make car vents and license plates. PC/ABS alloys can also be used to make automotive exterior parts such as automotive wheel covers, mirror housings, and taillight covers. PC/ABS has good formability and can process large parts of automobiles, such as car fenders.
V. Polyphenylene ether
Modified PPO is mainly used in automobiles for parts requiring high heat resistance, flame retardancy, electrical properties, impact properties, dimensional stability, and mechanical strength. For example, PPO/PS alloy is suitable for the manufacture of automobile wheel cover, front lamp glass slot, tail light shell and other parts when it is suitable for moisture, load and high electrical insulation and good dimensional stability. It is also suitable for manufacturing connection box and fuse. Automotive electrical components such as boxes and circuit breaker housings.
PPO/PA alloys have excellent mechanical properties, dimensional stability, oil resistance, electrical insulation and impact resistance. Can be used to make automotive exterior parts such as large baffles, cushions, rear spoilers, etc. The future application direction of PPO/PA alloy for hoods with high glass transition temperature requirements.
PPO/PBT alloys have high heat distortion temperature and low moisture sensitivity, making them ideal materials for the manufacture of automotive exterior panels.