[Chemical Knowledge]：The nature, use, upstream and downstream raw materials, storage methods, polybutylene terephthalate is dangerous goods?

Polybutylene terephthalate (PBT) properties, uses, upstream and downstream raw materials and storage methods

Polybutylene Terephthalate Properties

Polybutylene terephthalate (PBT) is a semi-crystalline thermoplastic polyester. It has excellent mechanical properties, chemical stability and electrical characteristics. The glass transition temperature of PBT is about 22°C, while its melting point is between 223-230°C. Its density is about 1.31-1.40g/cm³. PBT's high rigidity and abrasion resistance make it perform well in many applications, especially in high temperature and humid environments. PBT also has low water absorption and good dimensional stability, which makes it suitable for applications requiring long-term stable performance.

Polybutylene terephthalate use

Due to its excellent performance, PBT is widely used in many industries. In the electrical and electronic industry, PBT is commonly used in the manufacture of connectors, switches, sensors and insulation components, thanks to its good electrical insulation and heat resistance. In the automotive industry, PBT is used in the production of lamps, heater fans, instrument panel components and various components under the hood, mainly because of its heat resistance, mechanical strength and chemical resistance. In the consumer goods sector, PBT is used to make small appliance enclosures, kitchen utensils and sports equipment. PBT is also commonly used in the production of fibers, which are widely used in the textile and clothing industries.

Polybutylene terephthalate upstream raw material

The production of PBT relies on terephthalic acid (PTA) or dimethyl terephthalate (DMT) and 1,4-butanediol (BDO) as the main raw materials. Terephthalic acid is produced by the oxidation of p-xylene, while 1,4-butanediol is produced by the reaction of acetylene, formaldehyde and hydrogen. PTA or DMT and BDO are reacted by transesterification under the action of catalyst to produce oligomers, and then PBT is prepared by polycondensation reaction. In the production process, auxiliary materials such as stabilizers, catalysts and antioxidants are also needed to ensure the high quality and stability of PBT.

Polybutylene Terephthalate Downstream Products

PBT has a wide range of downstream products, including electronic components, automotive components, home appliance housings, fibers and consumer products. These products are widely used in electrical and electronic, automotive, home appliances, textile and consumer goods industries. The characteristics of PBT make it an indispensable material in these fields, meeting the market demand for high-performance materials. Especially in the electrical and automotive industries, the high strength and heat resistance of PBT ensure the safety and durability of the product.

Polybutylene terephthalate storage method

PBT materials need to avoid prolonged exposure to high temperature and high humidity during storage to prevent moisture absorption and performance degradation. The best storage conditions are dry, cool and well-ventilated warehouses, the temperature should be kept between 15-25°C, and the relative humidity should be less than 50%. In order to prevent PBT from absorbing moisture, it is usually necessary to store it in a sealed moisture-proof package, such as an aluminum foil bag or moisture-proof container. During transportation, attention should also be paid to moisture and mechanical damage to ensure that the material maintains its best performance before use.

Polybutylene Terephthalate Market Prospects

With the rapid development of electrical and electronic, automotive and consumer goods industries, the market demand for PBT is increasing. Especially in emerging applications such as new energy vehicles, 5G communication equipment and smart home appliances, the demand potential for PBT materials is huge. In the future, with the deepening of the concept of environmental protection and sustainable development, the production technology and application fields of PBT are expected to be further expanded, and the environmental performance and application value of PBT will be improved by introducing bio-based raw materials and modification technologies.

Polybutylene Terephthalate Modification and Innovation

In order to meet the needs of different application areas, PBT materials often need to be modified. By adding glass fibers, mineral fillers, flame retardants and antioxidants, the mechanical properties, heat resistance and flame retardancy of PBT can be enhanced. For example, glass fiber reinforced PBT has higher rigidity and strength and is suitable for structural components. Flame retardant PBT is widely used in electronic and electrical equipment that requires strict fire resistance. With the continuous progress of modification technology, PBT materials have been promoted and applied in more high-end applications.

Conclusion

Polybutylene terephthalate (PBT) plays an important role in many fields because of its excellent performance. Its production relies on upstream raw materials such as terephthalic acid or dimethyl terephthalate and 1,4-butanediol, and its products are widely used in electronic and electrical, automotive, home appliances and textile industries. In order to ensure its performance, PBT needs to be kept dry and avoid mechanical damage during storage and transportation. With the growth of market demand and the progress of technology, the application prospect of PBT materials is broad, and the innovation of modification technology further enhances its application value.