Learn about the physical properties and chemical properties of the polypropylene staple fiber!

1. The vertical surface of form polypropylene is smooth, and the cross section is circular.

2, the maximum advantage of density polypropylene is that the texture is light, and its density is only 0.91 g / cm3 is a common medium density in chemical fibers, so the same weight of polypropylene can be higher than the higher coverage area obtained by other fibers.

3, high strength of strong polypropylene, high strength, high initial modulus, excellent elasticity. Therefore, the polypropylene wear resistance is good. In addition, the moisture of polypropylene is substantially equal to strength, so it is an ideal material for making fishnets and cables.

4, moisture absorption and dyeing properties are well warm; almost unhappy, but the heart suction capacity is very strong, the moisture absorption is obvious; the hygroscopicity of polypropylene is small, almost unheathered, the returning rate under normal atmosphere is close to zero . However, it has a core, which can pass water vapor through a capillary in the fabric, but it is not a result of absorption. Polypropylene is poor, the chromatography is incomplete, but it can be used to make up for insufficient method.

5, acid-resistant and alkali-resistant polypropylene has better chemical resistance, except for concentrated nitric acid, concentrated caustic sodium, polypropylene and alkali resistance performance, so suitable as filtration materials and packaging materials.

6, the strength of the high polypropylene elastic wire is second only to the nylon, but the price is only a nylon 1/3; the fabric size is stable, the wear-resistant elasticity is also good, and the chemical stability is good. However, the thermal stability is poor, not getting sunrise, easy to aging and crisp loss, often add anti-aging agent in polypropylene

Polypropylene staple fiber with polyamide fibers, polyester fiber light, viscose fiber light, etc. have their own advantages, polypropylene staple fibers are mainly raw materials with polypropylene resins, after melt spinning, drafting, curl, drying stereotype , Packages and other process processes are colored and colorless, and they specify the fluffy fibers of the number and length.

So the polypropylene staple fiber has those quality performance? Light, the density is 0.9 ~ 0.92 g / ccC, which is the lightest in all synthetic fibers, which is 20% lighter than the polyamide fiber, 30% lighter than the polyester fiber, 40% minus the viscous fiber; intensity; High (dry state and wet state), wear resistance and return elasticity; anti-microorganisms, not mildew; chemical resistance is also superior to general synthetic fibers. Further, compared with other synthetic fibers, the electrical insulation and warmth of polypropylene fibers is preferably, its resistivity is high (7 × 1019 ohm, cm), and the thermal conductivity is small.

  However, the polypropylene staple fiber has a low melting point (165 ~ 173 ° C), poor light, thermal stability, sooth polypropylene fiber heat resistance, poor aging resistance, usually takes the addition of heat stabilizers and anti-aging agents to improve their performance. Its hygroscopicity and dyeness are the worst in the synthetic fibers, and the slot margin is less than 0.03%, and the ordinary dyes cannot be colored, and therefore, in the spinning, a quantity of coloring masterbills are added to the raw material polypropylene. Coloration.