Polybutylene terephthalate (PBT) belongs to polyester series. It is a kind of thermoplastic polyester resin made by polycondensation of 1.4-pbt-butanediol with PTA or DMT and mixing procedure. Together with pet, it is called thermoplastic polyester, or saturated polyester. 10% glass fiber reinforced, 20% glass fiber reinforced, 30% glass fiber reinforced, flame retardant, mineral filled, glass mineral mixed, high temperature resistant, glass fiber fireproof, hydrolysis resistant, lubricant added, heat stabilizer added, UV resistant, food grade, heat conduction grade, high flow.

Polybutylene terephthalate, also known as polytrimethylene terephthalate. Polystyleneterephthalate. PBT pbtp or ptmt for short is the polycondensation of p-benzoic acid and 1,4-butanediol. It can be made by condensation polymerization by transesterification or direct esterification. The development trend in the future is direct esterification. Together with pet, PBT is called thermoplastic polyester.

The main chain of PBT is composed of saturated linear molecules connected by rigid benzene ring and flexible aliphatic alcohol. The high geometric regularity and rigid part of the molecules make the polymer have high mechanical strength, outstanding chemical resistance, heat resistance and excellent electrical properties; There is no side chain in the molecule, and the structure is symmetrical, which meets the requirements of close stacking, so that the polymer has a high crystallinity and high melting point. The molecular structure determines that PBT has a good comprehensive performance. PBT is one of the latest and fastest-growing varieties of engineering plastics. The reason why PBT has become a rising star of engineering plastics lies in its excellent comprehensive performance, good molding processability and performance / price comparison. Therefore, although the industrial production of PBT plastics was not started until the 1970s, it quickly sold well in the market, and now it is one of the five fastest-growing engineering plastics.

1. Excellent mechanical properties, high mechanical strength, good fatigue resistance and dimensional stability. Creep is also small, and these properties rarely change at high temperature.

2. The energy consumption of PBT production is the lowest among engineering plastics, which is of great significance in the situation of energy shortage in the world.

3. The heat-resistant aging is excellent, the enhanced UL temperature index reaches 120 ~ 140 ℃, in addition, the outdoor long-term aging is also good.

4. Good solvent resistance, no stress cracking.

5. PBT is easy to flame retardant, up to UL94V-0. Due to its good affinity with flame retardant, it is easy to develop reactive or additive flame retardant grades. Flame retardant products are widely used in electronic and electrical industry.

6. PBT is easy to decompose when encountering water in high temperature and humidity environment, so it should be used carefully.

7. Excellent electrical performance, high volume resistivity and dielectric strength, excellent arc resistance, very small moisture absorption, and stable electrical performance in humid and high temperature environment. It is an ideal material for manufacturing electronic and electrical parts.

8. Easy molding and secondary processing, easy to use common equipment injection or extrusion. Due to the fast crystallization speed, good fluidity and lower mold temperature than other engineering materials, it only takes a few seconds to process thin-walled parts and 40-60s for large parts.

9. PBT Chinese name polybutylphthalate, referred to as saturated polyester, is a high crystalline thermoplastic.

1. Mechanical properties, tensile strength, tensile modulus and nylon are similar;

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

3. Low water absorption;

4. Excellent electrical properties;

5. Good dimensional stability;

6. Excellent resistance to oil and drug.

1. Electronic appliances: no fuse breaker, electromagnetic switch, flyback transformer, household appliance handle, connector, shell, etc;

2. Automobile: door handle, bumper, distributor cover, mudguard, conductor cover, wheel cover, etc;

3. Industrial parts: OA fan, keyboard, fishing tackle winder, parts, lampshade, etc.

PBT is opal translucent to opaque, crystalline thermoplastic polyester. It has high heat resistance, toughness, fatigue resistance, self lubrication, low friction coefficient, low weather resistance and water absorption, only 0.1%. It still maintains various physical properties (including electrical properties) in wet environment, electrical insulation, but dielectric loss is large. It is resistant to hot water, alkali, acid and oil, but easy to be eroded by halogenated hydrocarbon, and has poor hydrolysis resistance. It can crystallize rapidly at low temperature and has good formability. PBT has a fast crystallization speed, and the most suitable processing method is injection molding. Other methods include extrusion, blow molding, coating and various secondary processing molding. It needs to be pre dried before molding, and the moisture content should be reduced to 0.02%. PBT (reinforced and modified PBT) is mainly used in automobile, electronics, industrial machinery, polymer alloy and blending industry. For example, it is used as the distributor, car body part, igniter coil frame, insulation cover, exhaust system part, motorcycle igniter, deflection coil of television in the electronic and electrical industry, picture tube and potentiometer bracket, sound output transformer frame, adapter frame, switch connector, electric fan, refrigerator, washing machine motor end cover and shaft sleeve.