What is the development prospect of PBT engineering plastics in the automotive field
With the opening of the light-weight direction of cars, the development and application of PBT engineering plastics in cars by car manufacturers has always been the focus of the car industry and plastic industry.
PBT, as a full crystalline polyester, crystallizes rapidly and is easy to form; Melting point up to 225 ℃, good heat resistance; Low water absorption and good standard stability; Low friction coefficient and wear resistance; Good chemical, solvent and weather resistance; Good bending creep property; High flame retardant grade; The modified PBT materials satisfying the different functional requirements of various car parts can be obtained through various modified processing methods. In addition to their excellent functions, various toughened, filled and reinforced PBT and PBT Alloy materials have been widely used in cars, and new skills and applications have been continuously coming out.
The detailed application of PBT engineering plastics in car exterior and interior decoration and electrical includes: ashtray, door lock system, mirror, door handle, lamp frame, bumper, wiper, fuse box, connector, combustion system, lamp socket, etc. Car interior materials should have outstanding functions such as high temperature resistance, low gloss and high weather resistance; In addition to the functions of interior parts, exterior parts are also required to have the functions of high strength, high endurance, environmental condition resistance and impact resistance; Electrical components require flame retardant and insulating materials.
(1) car ashtray: in order to meet the requirements of flame retardance and temperature resistance, the material can be high flame retardant modified PBT, and the thermal deformation temperature can be up to 200 ℃.
(2) car door handle: the door handle is not only a functional part for opening and closing the door, but also a decorative part. The door handle is made of thermoplastic. Glass fiber reinforced PBT can be selected, which has the characteristics of weather resistance, chemicals and high stiffness.
(3) car door lock system: the car door lock system requires polymer materials to have excellent rigidity and standard stability, and the frequent rise and fall of doors and windows leads to higher ambient temperature. The modified PBT engineering plastic is an engineering plastic with excellent rigidity and high temperature resistance, which is the ambition in this field.
(4) car front large lamp decorative frame
As a kind of functional exterior decoration, the lamp decorative ring has become an important part of the personalized planning of cars. According to the particularity of the application environment, long-term application, light distribution, wall thickness and equipment of the lamp trim ring, the material is generally required to have the characteristics of high heat resistance, low fog value, high surface gloss, high rigidity and resistance.
The lamp structure can use 30% glass fiber to strengthen PBT, because it has high heat deformation temperature, excellent adhesion with glass metal, and high-grade bending strength. It has the characteristics of high temperature resistance, high strength, high rigidity, standard stability and creep resistance. This special material has excellent processability, good product apparent quality, less visible fusion lines, and excellent fluidity, which makes it suitable for manufacturing disordered headlight frames with short forming time. It can be mixed with most plastic colorants, other additives and fillers, and is easy to use.
(5) lamp shell: lamp is used for vehicle lighting, which can be divided into front lamp, rear lamp, turn signal lamp, license plate lamp, etc. The lamp plays an important role in the process of vehicle safety. The lamp housing material shall have high heat resistance and high strength.
(6) mirror housing
(7) car swing window shell
(8) car radiator grille: the radiator grille is an open part set to cool the engine and is located in the front of the car body. Pc/pbt has high low-temperature impact strength and strong corrosion resistance to automotive chemicals. The radiator grille of cars processed with pc/pbt is easy to paint.
(9) car bumper: bumper is one of the primary exterior trim parts of car. The requirements for materials are ultra-high impact, excellent cold resistance and excellent shock resistance. At present, impact resistant PP is widely used as the base material for the bumper of general cars, while pbt/pc high-function alloy is widely used as the base material for the bumper of high-end brand cars. This material has high impact strength, which is much higher than the PP material of the same type. It can well absorb the impact energy due to collision, so the car has higher safety.
(10) wiper handle bracket: glass fiber reinforced PBT can be selected for vehicle wiper handle, which has the characteristics of high rigidity, weather resistance and chemical resistance.
(11) car fuse box
(12) car combustion coil shell: glass fiber reinforced PBT, with high mechanical strength, strong dielectric function and good temperature resistance. It can meet the requirements of the shell of the combustion system for stress cracking resistance (equipped with metal inserts), standard stability and good electrical insulation.
(13) lamp socket: high rigidity, excellent temperature resistance and standard stability.
(14) car terminal block
In 2013, China' s car output reached 22.4 million. According to the budget of about 150kg plastic per car, the domestic car plastic market can increase by 3.36 million tons every year. During this period, PBT engineering plastics and modified products accounted for about 3-5%, about 170000 tons.
As the price of PBT engineering plastics has continued to fall in recent years, its outstanding cost performance has shown more and more significant advantages, especially in the field of cars, it has a bright future in replacing metal materials for non stressed parts.
Article source: PBT engineering plastics http://www.xrtsm.com.cn/
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