What is PBT Meltblown Nonwoven Fabric?
PBT (polybutylene terephthalate) meltblown fabric is a kind of ultrafine fiber nonwoven material made through a high-temperature meltblown process. Compared with traditional PP meltblown fabric, it has become an “invisible rigid demand” in high-end fields such as liquid filtration and battery separators due to its high-temperature resistance, chemical corrosion resistance, dimensional stability, and other characteristics.
Core Advantages, Instantly Understand Why Choose PBT
1. High-Temperature Resistant King
- With its long-term resistance to high temperatures of 150℃ (PP melt-blown only reaches 90℃), it is an ideal material for battery separators in new energy vehicles.
- Case: A certain brand of electric vehicle battery pack adopts a PBT melt-blown separator, resulting in a 60% reduction in high-temperature short-circuit rate.
2. Resistant to Chemical Corrosion
- Resistant to strong acids (such as sulfuric acid) and organic solvents (such as DMF), it is a standard configuration for wafer cleaning filters in the semiconductor industry.
- Comparative experiment: When PBT filter material is soaked in an acid solution with pH=2 for 72 hours, the strength retention rate is greater than 90%.
3. Achieving Both Precision and Longevity
- The fiber diameter can be controlled within 1-3μm, with a filtration accuracy of 0.1μm (PM0.1 level), and it remains intact even after repeated washing.
PBT Meltblown vs. PP Meltblown: A Performance Showdown
| Characteristic | PBT Meltblown Fabric | Ordinary PP Meltblown Fabric |
|---|---|---|
| Temperature Resistance | Long-term stability at 150℃ | It is prone to softening and deformation at 90℃ |
| Chemical Stability | Resistant to strong acids/alkalis/organic solvents | Only resistant to weak acids and alkalis |
| Filter Life | The efficiency remains unchanged after 50 washes | Washing 10 times reduces efficiency by 30% |
| Cost | Relatively high (about 80,000 yuan/ton) | Relatively low (around 30,000 yuan/ton) |
High-Value Applications of PBT Meltblown Fabric
1. Medical-grade Liquid Filtration
- The core material of blood transfusion/infusion filters must prevent bacterial endotoxin contamination (procurement standard for 90% of top-tier hospitals in China).
2. New Energy Battery Separator
- Used as an electrolyte carrier in solid-state batteries, it addresses the issue of high-temperature shrinkage in traditional PE separators.
3. Semiconductor Ultrapure Water Filtration
- In the chip cleaning process, intercepting particles of 0.1μm can improve the yield rate by 5% (case study of SMIC supply chain).
4. Industrial Oil Mist Recovery
- The recovery efficiency of machine tool cutting oil mist reaches 99.9%, utilizing a special material for machine tool filter cartridges from a German brand.
5. High-end Protective Clothing
- The inner lining of biochemical protective clothing combines breathability with chemical barrier properties.