Polypropylene is one of the main raw materials for non-woven fabrics, which can endow non-woven fabrics with excellent physical properties.
What is non-woven fabric
Non woven fabric is a new generation of environmentally friendly material that combines fibers or granular short fibers through chemical, mechanical, or chemical composite methods, without arranging fibers in a textile manner.
Why use polypropylene
Polypropylene is one of the most common raw materials in the production of non-woven fabrics, mainly due to the following reasons:
1. Polypropylene has good wear resistance and toughness, which can improve the strength and durability of non-woven fabrics;
2. Polypropylene is easy to process and shape, making the manufacturing process of non-woven fabrics simpler;
3. Polypropylene melts at high temperatures and can provide good bonding for non-woven fabrics.
Characteristics of specialized polypropylene material for meltblown fabrics
Melt blown special polypropylene material PP is a universal thermoplastic polymer, which has the characteristics of high strength, good insulation, low water absorption, high thermal deformation temperature, low density, high crystallinity, and good melt flowability; At the same time, it has good solvent resistance, oil resistance, weak acid and alkali resistance, and is inexpensive and easy to obtain, so it is widely used in the fiber field.
Process requirements for special polypropylene material for meltblown fabric
Due to the particularity of melt blown technology, PP raw materials used as special materials for melt blown nonwoven fabrics must meet the following requirements:
(1) A very high melt index should be greater than 400g/10min.
(2) Narrow relative molecular weight distribution (MWD).
(3) Low ash content, low melt index of meltblown raw materials, high viscosity of the melt, requiring the extruder to provide greater pressure to smoothly extrude it from the nozzle hole, requiring greater energy consumption and subjecting the meltblown equipment to greater pressure; And the melt cannot be fully stretched and refined after being extruded from the spinning hole, making it impossible to form ultrafine fibers.
Therefore, only PP raw materials with high melt index can meet the requirements of melt blown technology, produce qualified ultrafine fiber nonwoven fabrics, and reduce energy consumption. The relative molecular weight distribution has a significant impact on the properties, processing performance, and usability of PP melt. For the production of melt blown nonwoven fabrics, if the relative molecular weight distribution is too wide and there is a high content of low relative molecular weight PP, the stress cracking of PP will become more severe.
The role of polypropylene in non-woven fabrics
1. Improve the strength and durability of non-woven fabrics
Due to its good wear resistance and toughness, adding polypropylene can improve the strength and durability of non-woven fabrics, making them more durable and wear-resistant.
2. Improve the filtration performance of non-woven fabrics
Polypropylene is a microporous material that can filter small particles by controlling its pore size during the production of non-woven fabrics. Therefore, polypropylene can exhibit excellent filtering performance in non-woven fabrics.
3. Make non-woven fabric form a tighter structure
Polypropylene melts at high temperatures and provides good bonding for non-woven fabrics, forming a tighter structure between fibers and making non-woven fabrics more stable and sturdy.
Conclusion
In summary, polypropylene, as one of the main raw materials for non-woven fabrics, can endow non-woven fabrics with excellent physical properties and plays a crucial role in the manufacturing process of non-woven fabrics.
Post time: Dec-15-2024