Main physical and chemical properties of polypropylene high-strength yarn

1. Form

The longitudinal surface of polypropylene is straight and lubricated, and the cross section is circular.

2. Density

Polypropylene has the advantage of light texture, its density is only 0.91g/cm3 is a common chemical fiber in the density of lighter species, so the same weight of polypropylene than other fibers to get a higher cover area.

3. Strong extensibility

Polypropylene has high strength, large elongation, high initial modulus and excellent elasticity. So polypropylene good wear resistance. In addition, the wet strength of polypropylene is equal to the dry strength, so it is the ideal material for the manufacture of fishing nets and cables.

4. Hygroscopicity and dyeability

The moisture absorption of polypropylene is very small, it is not hygroscopic, and the moisture regain under single atmospheric conditions is close to zero. However, it has a wicking effect and can transmit water vapor through the capillaries in the fabric, but it does not have any absorption effect on its own. Polypropylene dyeing is poor, incomplete chromatography, but can be used to compensate for the lack of liquid coloring.

5. Acid and alkali resistance

Polypropylene has good resistance to chemical corrosion, in addition to concentrated nitric acid, concentrated caustic soda, polypropylene on acid and alkali resistance performance is good, so it is suitable for use as filtering materials and packaging materials.

6. Light resistance, etc.

Polypropylene light resistance is poor, thermal stability is also poor, easy to aging, not resistant to ironing. But can pass through the spinning to participate in the defense.

What is the performance of polyester yarn and polyester yarn

Polyester is a single important type of synthetic fiber, and it is the commodity title of polyester fiber in China. It is to purified terephthalic acid (PTA) or terephthalic acid dimethyl ester (DMT) and ethylene glycol (EG) as raw material by esterification or ester exchange and polycondensation reaction of fiber polymer-polyethylene terephthalate (PET), after spinning and disposal made of fiber.

Polyester filament has the following properties

1, high strength, short fiber strength is 2.6~5.7cN/dtex, high strength fiber is 5.6~8.0cN/dtex. Due to its low hygroscopicity, its wet strength is essentially the same as its dry strength. The impact strength is 4 times higher than nylon and 20 times higher than viscose fiber.

2, good elasticity, elasticity close to wool, when the elongation of 5% to 6%, it can be completely restored. The wrinkle resistance surpasses other fibers, that is, the fabric does not wrinkle and has good dimensional stability. The elastic modulus is 22 ~ 141cN/dtex, which is 2~3 times higher than that of nylon.

3, good heat resistance

4, good water absorption

Through the above introduction, you can distinguish the difference between polyester yarn and polypropylene high-strength yarn?