PBT material is a kind of crystalline aromatic polyester, which has the advantages of excellent chemical resistance, low moisture absorption, and easy processing and forming. However, the mechanical properties of unmodified PBT materials are mostly inferior to other engineering plastics, and there are also disadvantages such as low heat distortion temperature, dimensional stability at high temperatures, and sensitivity to notches in impact strength. The modification of PBT materials mainly includes glass fiber reinforced PBT and flame-retardant PBT.

The flame retardancy of PBT material is UL94HB level, and only after adding flame retardant can it reach UL94V-0 level. Commonly used flame retardants are bromide, phosphide, chloride and antimony trioxide. At present, most of the flame retardant PBT is a type of flame retardant added with decabromodiphenyl ether and antimony trioxide.

Glass fiber reinforced PBT material has excellent toughness and fatigue resistance, good heat resistance, good weather resistance, good electrical properties, and low water absorption. The customers of Qingdao Sino-Singapore Huamei Company strengthen and flame-retardantly modify it according to customer requirements. After modification, the heat resistance, modulus, dimensional stability and flame retardancy can be significantly improved, and the flame-retardant PBT materials are widely used in automobiles, electronic and electrical industries.

Main features of PBT material

1. Stable mechanical properties. Tensile strength and tensile modulus are similar to nylon;

2. The friction coefficient is small and self-lubricating;

3. Low water absorption and excellent electrical properties;

5. Good size stability;

6. Excellent chemical resistance and oil resistance.

The main application of PBT materials

1. Electronic appliances

Fuseless circuit breakers, electromagnetic switches, flyback transformers, household appliances handles, connectors, etc.; PBT usually adds 30% glass fiber blends as connectors. PBT is due to its mechanical properties, solvent resistance, good forming processability 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 to rotate for a long time to help dissipate heat. The physical properties of the plastic require heat resistance, flame retardancy, insulation and mechanical strength. PBT is usually in the form of 30% fiber addition Used as the outer frame of the cooling fan and the fan blade coil shaft.

3. Electrical components

Glass fiber reinforced PBT is also used as the coil shaft in transformers and relays, and is generally injection molded with 30% PBT fiber. The physical properties required for the coil shaft include insulation, heat resistance, solder resistance, fluidity, strength, etc. The applicable materials include glass fiber reinforced PBT, glass fiber reinforced PA6, and glass fiber reinforced PA66.

4. Automotive industry

a. External parts: mainly car bumpers (PC/PBT), door handles, corner grids, engine heat vent covers, window motor shells, mudguards, wire guards, rim covers, automobile transmission gear boxes Wait;

b. Internal components: mainly include endoscope stays, wiper brackets and control system valves;

c. Automotive electrical parts: automotive ignition coil twisted tubes and various electrical connectors, etc.

At the same time, it can also be applied to the charging gun shell of new energy vehicles.

5. Mechanical equipment

PBT materials are also widely used in tape drive shafts of video tape recorders, electronic computer covers, mercury lamp covers, electric iron covers, baking machine parts, and a large number of gears, cams, buttons, electronic watch housings, camera parts (with resistance to Heat and flame retardant requirements)