PBT or polybutylene terephthalate is a synthetic semi crystalline engineering thermoplastic with similar characteristics and composition to polyethylene terephthalate (PET). It is a part of the polyester resin group and has the same characteristics as other thermoplastic polyesters. It is a high-performance material with high molecular weight, usually considered a sturdy, hard, and engineering plastic. The color range of PBT ranges from white to bright.
purpose
PBT exists in daily life and is commonly found in electrical, electronic, and automotive components. PBT resin and PBT compound are two products used for various applications. PBT compounds include various materials, including PBT resins, glass fiber fillers, and additives, while PBT resins only include base resins. This material is typically used for mineral or glass filling grades.
For outdoor use and areas that are concerned about fires, additives have been added to improve their UV and flammability. Through these modifications, PBT products can be used in numerous industrial applications.
PBT resin is used to manufacture PBT fibers as well as electronic, electrical, and automotive parts. TV accessories, motor covers, and motor brushes are examples of using PBT compounds. After reinforcement, it can be used for switches, sockets, spools, and handles. The unfilled PBT version exists in some brake cable linings and brake rods.
When materials with high strength, good dimensional stability, resistance to various chemicals, and good insulation are needed, PBT is the first choice. The same applies when bearings and wear characteristics are determining factors. Due to these reasons, valves, food processing machinery components, wheels, and gears are all made of PBT. Its application in food processing components is mainly due to its low moisture absorption and stain resistance. It also does not absorb flavors.
advantage
The main advantages of PBT are its solvent resistance and low shrinkage during molding. It also has good resistance and is easy to shape due to its rapid crystallization. It has excellent heat resistance up to 150 degrees Celsius and a melting point of 225 degrees Celsius. The addition of fibers enhances its mechanical and thermal properties, enabling it to withstand higher temperatures. Other significant advantages include:
Excellent stain resistance
Excellent processing characteristics
high strength
toughness
Excellent stiffness to weight ratio
Resistance to environmental changes
Excellent processing characteristics
Better impact resistance than PET
Excellent dimensional stability
Block ultraviolet radiation
High electrical insulation performance
Multiple levels available for selection
shortcoming
The drawbacks of PBT limit its application in certain industries, including:
Strength and stiffness lower than PET
The glass transition temperature is lower than PET
When glass is used as a filler, it is prone to warping
Inadequate tolerance to acids, bases, and hydrocarbons
The Future of PBT
With the population growth and innovation in the automotive, electrical, and electronics industries, the use of PBT will steadily increase. Given the increasing demand for lighter, more durable, lower maintenance costs, and cost competitive materials in the automotive industry, this is particularly evident in the automotive industry.
Due to the issue of metal corrosion and the high cost of minimizing this issue, the use of engineering grade plastics such as PBT will increase. Many designers looking for metal alternatives are turning to plastic as a solution. A new level of PBT has been developed that can provide better results in laser welding, providing a new solution for welding parts.