Main physical and chemical properties of polypropylene
1.The longitudinal surface of polypropylene is straight and smooth, with a circular cross-section.
2.The biggest advantage of density polypropylene is its lightweight texture, with a density of only 0.91g/cm3, making it the lightest variety among common chemical fibers. Therefore, polypropylene of the same weight can achieve higher coverage area compared to other fibers.
3. Strong stretchable polypropylene has high strength, elongation, high initial modulus, and excellent elasticity. So polypropylene has good wear resistance. In addition, the wet strength of polypropylene is basically equal to its dry strength, making it an ideal material for making fishing nets and ropes.
4. Light moisture absorption and dyeing properties, good warmth retention; Almost non hygroscopic, but has strong suction ability and obvious moisture wicking effect; Polypropylene has very low moisture absorption, almost no moisture absorption, and its moisture regain under general atmospheric conditions is close to zero. But it has a core suction effect and can transmit water vapor through the capillaries in the fabric, but it does not have any absorption effect on its own. Polypropylene has poor dyeing properties and incomplete chromatography, but it can be compensated for by coloring with the original solution.
5. Acid and alkali resistant polypropylene has good chemical corrosion resistance. In addition to concentrated nitric acid and concentrated caustic soda, polypropylene has good resistance to acid and alkali, making it suitable for use as a filtering material and packaging material.
6. Polypropylene has poor light resistance and thermal stability, is prone to aging, and is not resistant to ironing. However, anti-aging performance can be improved by adding anti-aging agent during spinning. In addition, polypropylene has good electrical insulation, but it is prone to static electricity during processing.
7. High strength polypropylene elastic yarn has a strength second only to nylon, but its price is only one-third of nylon; The fabric is made with stable dimensions, good wear resistance and elasticity, and good chemical stability. However, it has poor thermal stability, is not resistant to sunlight, and is prone to aging and brittle damage. Therefore, anti-aging agents are often added to polypropylene fibers.