PBT material is a crystalline aromatic polyester with excellent chemical corrosion resistance, low hygroscopicity and easy processing. However, the mechanical properties of unmodified PBT materials are mostly inferior to other engineering plastics, and there are also shortcomings such as low heat distortion temperature, dimensional stability at high temperatures, and sensitivity to impact strength. The modification of PBT materials mainly includes glass fiber reinforced PBT and flame retardant PBT.
The flame retardancy of PBT materials is UL94HB grade, and UL94V-0 can only be achieved after adding flame retardant. Common flame retardants are bromide, phosphide, chloride and antimony trioxide. At present, most of the flame retardant PBT is a flame retardant type in which decabromodiphenyl ether and antimony trioxide are added.
The glass fiber reinforced PBT material has excellent toughness and fatigue resistance, heat resistance, good weather resistance, good electrical properties and low water absorption. Qingdao Zhongxin Huamei Company's customers are enhanced and flame retardant modified according to customer requirements. After modification, the heat resistance, modulus, dimensional stability and flame retardancy can be significantly improved, and the flame retardant PBT material is widely used in automobiles, electronic and electrical industries.
Main features of PBT materials
1. Mechanical properties The tensile strength is similar to the tensile modulus and nylon;
2. The friction coefficient is small and self-lubricating;
3. Low water absorption and excellent electrical properties;
5, good dimensional stability;
6. Excellent chemical resistance and oil resistance.
The main application of PBT materials
1. Electronic appliances
Fuseless disconnector, electromagnetic switch, reversing transformer, home appliance handle, connector, etc.; PBT usually adds 30% glass fiber blending as connector, PBT due to mechanical properties, solvent resistance, good formability and low price Widely adopted.
2, cooling fan
Glass fiber reinforced PBT is mainly used in cooling fans. The cooling fan is placed in the machine for a long time to help dissipate heat. It requires heat resistance, flame retardancy, insulation and mechanical strength for plastic properties. PBT is usually 30% added. Applies as a cooling fan outer frame and a blade coil shaft.
3, electrical components
The glass fiber reinforced PBT is also used as a coil shaft in transformers and relays, and is generally formed by injection molding of 30% PBT. The physical properties required for the coil shaft include insulation, heat resistance, solder resistance, fluidity, strength, etc. Suitable materials include glass fiber reinforced PBT, glass fiber reinforced PA6, and glass fiber reinforced PA66.
4, the automotive field
a, external parts: mainly car bumper (PC / PBT), door handle, corner Geshan, engine heat release hood, window motor casing, fender, wire sheath, rim cover, automotive transmission gear box Wait;
b. Internal components: mainly endoscope stays, wiper brackets and control system valves;
c. Automotive electrical parts: automotive ignition coils and various electrical connectors.
It can also be applied to the charging gun housing of new energy vehicles.
5, mechanical equipment
PBT materials are also widely used in video tape recorders, such as belt drive shafts, computer covers, mercury lamp covers, electric iron covers, baking machine parts, and a large number of gears, cams, buttons, electronic watch housings, and camera parts. Heat, flame retardant requirements)
