One: The density of lightweight polypropylene fiber is 0.90-0.92 g/cm3, which is relatively light among all chemical fibers. It is 20% lighter than nylon, 30% lighter than polyester, and 40% lighter than viscose fiber. Therefore, It is very suitable to be used as a filler for winter clothing or fabrics for ski suits and mountaineering suits.
Two: High strength, good elasticity, wear resistance and corrosion resistance:
Polypropylene has high strength (the same in dry and wet conditions), and is an ideal material for making fishing nets and cables; it has good abrasion resistance and resilience, its strength is similar to polyester and nylon, and its rebound rate is comparable to nylon and wool. Lent and viscose fibers are much larger; polypropylene fiber has poor dimensional stability, is easy to pilling and deformed, is anti-microbial, and does not moth; chemical resistance is better than ordinary fibers.
Three: It has electrical insulation and warmth retention:
Polypropylene fiber has high electrical resistivity (7×1019Ω.cm) and low thermal conductivity. Compared with other chemical fibers, polypropylene fiber has very good electrical insulation and warmth retention, but it is easy to generate static electricity during processing.
Four: Poor heat resistance and aging resistance:
Polypropylene fiber has a low melting point (165~173°C) and poor stability to light and heat. Therefore, polypropylene fiber has poor heat resistance and aging resistance, and is not resistant to ironing. But it can improve its anti-aging performance by adding anti-aging agent during spinning.
Five: Poor hygroscopicity and dyeability:
The hygroscopicity and dyeability of polypropylene fiber are poor among chemical fibers, almost no moisture absorption, and its moisture regain rate is less than 0.03%. Fine denier polypropylene has a strong wicking effect, and water vapor can be removed through the capillary in the fiber. After being made into clothing, the comfort of the clothing is better, especially the ultra-fine polypropylene fiber, due to the increased surface area, can transmit sweat faster and keep the skin comfortable. Because the fiber does not absorb moisture and has a small shrinkage rate, polypropylene fabric has the characteristics of easy washing and quick drying.
Polypropylene has poor dyeability, light color, and poor dye fastness. Ordinary fuels cannot be dyed, and most of the colored polypropylene fibers are produced by coloring before spinning. It can be used for coloring, fiber modification, and blending with fuel complexing agent before melt spinning.