The main physical and chemical properties of polypropylene:

2 . Form: The longitudinal direction of the polypropylene is flat and smooth, and the cross section is round, Y-shaped or triangular.
3 . Density: The biggest advantage of polypropylene is its light texture. Its density is only 0.9-0.96g/cm3. It is the lightest density among common chemical fibers. It is 20% lighter than polyamide fiber and 30% lighter than polyester fiber. The fiber is 40% lighter, so the same weight of polypropylene can be obtained with a higher coverage area than other fibers.

4 . Extensibility: The strength of polypropylene is high (strength 0.5cN/dtex-0.7cN/dtex), the elongation is large, the initial modulus is high, and the elasticity is excellent, so the polypropylene wear resistance is good. In addition, the wet strength of polypropylene is basically equal to dry strength, so it is an ideal material for making fishing nets and cables.

5 . Hygroscopicity and Dyeability: Polypropylene has little hygroscopicity and is almost non-hygroscopic. The moisture regain under atmospheric conditions is close to zero. However, it has a wicking action that transfers water vapor through the capillary in the fabric, but does not itself absorb any absorption. The dyeability of polypropylene is poor, and the chromatogram is incomplete, but the method of adding color masterbatch co-spinning can be used to make up for the deficiency.

6 . Acid and alkali resistance: Polypropylene has good chemical resistance. In addition to concentrated nitric acid and concentrated caustic soda, polypropylene has good resistance to acid and alkali, so it is suitable for use as filter materials and packaging materials.

7 . Light resistance: Polypropylene has poor light resistance, poor thermal stability, easy aging, and is not resistant to ironing, but it can be improved by adding an anti-aging agent during spinning.

8 . Flame retardancy, stain resistance, electrical insulation: polypropylene has good flame retardant properties, but it is easy to generate static electricity during processing, strong stain resistance, dust absorption is only equivalent to wool, easy to clean, easy to dry, electrical insulation properties Wait a minute.