The hottest engineering plastics show their magic

2022-08-02
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Engineering plastics have shown their magic power in the automotive field

and targeted policy resources. 14.3% of the global greenhouse gases come from the automotive industry. Under the background that the development of low-carbon economy has become a global consensus, energy conservation and environmental protection are the two major problems facing the automotive industry. The application of plastics in automobiles can achieve the sustainable development of reduction, reuse and recycling. At present, the average use of single vehicle plastic in developed countries is more than 150kg, accounting for 12% ~ 20% of the total vehicle mass, while the use of single vehicle plastic in China accounts for about 7% ~ 10% of the vehicle weight. Among the automotive plastics, general plastics (PP, PE, PVC, ABS) have the lowest price, accounting for about 50%, followed by engineering plastics (PA, PC, PPO, PBT, POM) accounting for about 15%, and special engineering plastics (PSU, peek, PES) have higher price and lower proportion

nylon (PA)

pa has high impact strength and excellent comprehensive properties such as friction resistance, heat resistance, chemical resistance, lubricity and dyeability. In the automotive industry, PA is mainly used in automotive engines and their surrounding components. The components around the engine are mainly heating and vibrating components, which are required to withstand the ambient temperature of -40 ℃ ~ 140 ℃, and to be resistant to sand impact, salt spray corrosion, and the erosion of various oils and detergents. Intake manifold is the most typical application of modified PA in automobile, mainly using PA6 and PA66. PA11 is widely used in European and American countries as the brake pipe and oil pipeline of automobiles. PA is also used in the automotive industry for engine cylinder cover, engine decorative cover, radiator water chamber, accelerator pedal, fuel tank, fuel pipe, diversion cover, etc. in China, these materials are generally more transparent than polyethylene and polypropylene, which are responsible for reviewing the overall deployment and important plans to promote the development of new material industry, and are also used in domestic Audi, Jetta, Santana and other models

polycarbonate (PC)

at present, PC is mainly used in automobile interior and exterior parts in the form of alloy, mainly pc/abs, pc/pbt and pc/pet alloys, mainly used in lamps, instrument signs, sun visors and window glasses

pc/abs alloy is the most suitable material for automotive interior parts, and it is also an ideal material for manufacturing automotive dashboard. Its thermal deformation temperature is 110 ~ 135 ℃. The new generation of pc/abs alloy has the characteristics of hydrolytic stability, ultra-low gloss and chemical solvent resistance, and can even be recycled

pc/pbt or pc/pet alloy materials have not only the high heat resistance and high impact resistance of PC, but also the chemical resistance, wear resistance and molding processability of PBT or pet. They are ideal materials for manufacturing automotive exterior parts. Pc/pbt and pc/pet alloys toughened by elastomer are more suitable for making automobile body panels, automobile side guards, fenders, automobile door frames, etc. The injection molded exterior parts of high heat-resistant pc/pbt and pc/pet can not be painted. Pc/pet alloy can also be used to make automobile exhaust port and license plate cover

polyester (PBT, PET)

pbt is widely used in the production of bumpers, carburetor components, fenders, spoilers, spark plug panels, fuel supply system parts, instrument panels, automobile igniters, accelerators and clutch pedals. Pet is rarely used alone. It is mostly reinforced by glass fiber or modified by filling, copolymerization, blending and other methods. The application of modified PET in automobile includes door reflector frame, fog lamp, sound horn, sunroof frame and ceiling, etc

the decorative ring material used to be mainly heat-resistant PC material, which has been gradually replaced by pbt/pet lamp material in recent years. Compared with heat-resistant PC, the material is characterized by high heat resistance, good processability, low cost and high surface gloss; Excellent processing stability and hydrolysis resistance; With excellent fluidity and heat resistance, it can realize the integration of the headlamp reflector and decorative ring

Polyoxymethylene (POM)

polyoxymethylene resin is a highly crystalline polymer with hardness, strength and rigidity similar to metal. It has good self lubrication, good fatigue resistance and low friction factor under a wide range of temperature and humidity conditions. It is mainly used for sliding and rolling mechanical parts with strict qualitative requirements

the modified POM has very low wear resistance coefficient and strong rigidity. It is very suitable for manufacturing automobile pumps, carburetor components, oil pipelines, power valves, universal joint bearings, cranks, handles, instrument panels, automobile window elevator devices, electric switches, safety belt buckles, etc

POM type three-layer composite materials are widely used in automobile chassis bushings, such as steering knuckle bushings, various support bushings, front and rear leaf spring bushings, etc. it is a three-layer composite material with cold-rolled steel plate as the matrix, sintered porous bronze powder as the intermediate layer, and modified POM as the friction reducing layer on the surface. It has not only the mechanical strength and rigidity of steel, but also excellent anti-wear and anti-wear properties

in the practical application of polyphenylene oxide (PPO)

in the automotive industry, most of them use modified PPO (MPPO), and the leading industrialized products are still ppo/ps, ppo/pa and ppo/pbt alloys

ppo/ps alloy is suitable for wet, loaded occasions with high requirements for electrical insulation and good dimensional stability. It is suitable for manufacturing automobile wheel covers, front lamp glass slots, tail lamp shells and other parts, as well as automobile electrical components such as connection boxes, fuse boxes and disconnect switch shells. Ppo/pa alloy can be used to make automobile exterior parts, such as large baffle, cushion and rear baffle, because of its excellent mechanical properties, dimensional stability, oil resistance, electrical insulation and impact resistance

ppo/pbt alloy has high hot deformation temperature and low sensitivity to moisture. It is an ideal material for manufacturing automobile outer panels

special engineering plastics

polyphenylene sulfide (PPS) has high strength and excellent comprehensive performance, and is regarded as an ideal material for automobile lightweight. Used for automobile functional parts: parts and components of igniter, heater, carburetor, clutch, transmission, gearbox, bearing bracket, lampshade, bumper, fan, exhaust system, reflector and lamp holder. It can replace metal to make exhaust funnel circulating valve, water pump impeller, pneumatic signal adjuster, etc

polyether ether ketone (PEEK) has excellent heat resistance, wear resistance, vibration absorption, ultra-high melting point of 340 ℃ and excellent chemical resistance and hydrolysis resistance. It can be used for piston set, gasket, washer, bearing, transmission, braking and air conditioning system, transmission device, gear and electronic sensor, etc

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