Today, Jiuzhi Plastics Network Xiaobian takes everyone to understand the advantages and disadvantages of
PBT materials and the modification methods, as follows:
First, the advantages and disadvantages
1. Advantages:
Excellent mechanical properties, especially high rigidity and hardness
Good heat resistance, heat distortion temperature up to 180 °C
Good surface gloss performance, especially suitable for spray-free electronic and electrical products
Faster crystallization speed, good fluidity and excellent formability
Good thermal stability, especially low thermal expansion and dimensional shrinkage
Resistant to chemicals, solvents and weathering
High dielectric strength and good electrical performance
Low hygroscopicity with minimal impact on electrical and dimensional stability
2. Shortcomings:
The molecule contains an ester bond and will decompose under the action of strong acid, strong alkali and water vapor.
The material is sensitive to the gap and there is brittleness
Second, modification
Enhanced modification
Adding glass fiber to PBT, glass fiber and PBT resin have good bonding force. After adding a certain amount of glass fiber to PBT resin, it can not only maintain the original advantages of chemical resistance and processability of PBT resin, but also have a large range. Improve its mechanical properties and overcome the notch sensitivity of PBT resin.
2. Flame retardant modification
PBT is a crystalline aromatic polyester. If no flame retardant is added, its flame retardancy is UL94HB grade. Only after adding flame retardant can it reach UL94V0 grade.
Commonly used flame retardants are halogenated flame retardants such as bromide, Sb2O3, phosphide and chloride. The most is decabromodiphenyl ether, which has been the main PBT flame retardant, but due to environmental reasons, European countries are very early. Forbidden to use, all parties are looking for alternatives, but there has been no performance advantage over the replacement of decabromodiphenyl ether.
3. Blending alloy modification
The main purpose of blending PBT with other polymers is to improve the notched impact strength, improve the warpage deformation caused by shrinkage of the molding process, and improve the heat resistance.
Blending is commonly used at home and abroad to modify it. The polymers modified for PBT are mainly PC, PET and so on. These products are mainly used in automobiles, electronics, and power tools. The proportion of glass fiber is different, and its application fields are also different.
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