Which is better, polypropylene or polyester? The difference between polypropylene and polyester

1. Performance comparison of polypropylene fine denier filament and polyester filament for clothing

Although the chemical structures of polypropylene and polyester are quite different - polypropylene is a homopolymer obtained by free radical polymerization of propylene, while polyester is a copolymer obtained by polycondensation of terephthalic acid and ethylene glycol, but after spinning The fiber obtained by processing can meet the requirements of taking. The requirements for wearing textile fibers are, firstly, appropriate physical and mechanical properties; secondly, the appearance and wearing comfort of the woven fabric, such as stiffness, softness, no pilling, water absorption, and breathability. Compared with polypropylene fine denier yarn, it is better than polyester.

2. Initial elastic modulus

    Indicates the fiber's resistance to small extensions. In clothing, it reflects the stiffness of the fiber to small extensions or small bends. Generally speaking, the larger the initial modulus, the smaller the fiber deformation and the better the rigidity. The initial modulus of polypropylene is lower than that of polyester and higher than that of nylon, and the flexibility of its fabric is between polyester and nylon.

3. Relative density

The relative density of polypropylene is 0.91, which is 40% lighter than cotton and 34% lighter than polyester. It is one of the lighter fibers among all fibers and the only fiber lighter than water. This shows that polypropylene can be made into a light fabric, or has the largest volume under the same weight, or has good thermal insulation. Therefore, polypropylene fine denier yarn is the best material for making sportswear, swimwear and military quilts.

4. Wear resistance

Because polypropylene fiber is constantly subjected to friction during use, the friction resistance of the fiber determines the use range and service life of the fiber, and the wear resistance of polypropylene is better than that of polyester.

5. Comparison of appearance and wearing comfort of acrylic and polyester fibers and fabrics

Because its dpf (denier of a single fiber) of fine denier polypropylene filament is less than 2, it has changed the waxy feel of ordinary polypropylene fibers in the past, and the shortcoming of poor clothing usability, which makes fine and ultra-fine denier polypropylene textile products become high-grade. product.

6. Breathable and drainage

Breathability and drainage is an indicator to measure the comfort of wearing. The so-called air permeability refers to the ability to transmit and diffuse the gaseous water in the atmosphere through the fabric under certain wind speed and time conditions. When the human body sweats, the gaseous sweat can be well discharged, which will make people feel comfortable; Drainage refers to the capillary attraction, or wicking, effect of the fabric. When liquid water encounters the fabric, it mainly relies on the inter-fiber space in the fabric and the capillary action of the fiber to transmit water. The drainage of the fiber is not only affected by the surface tension, but also related to the radius of the capillary. As the fiber fineness becomes thinner, its drainage capacity increases. Therefore, drainage varies with the degree of capillaryization of the fibers, the finer the fibers, the better the wicking and the better the drainage.

In summary, fine denier polypropylene filament is better than polyester, and fine denier polypropylene itself also has excellent functionality, which is incomparable to polyester. The functionality of polyester needs to be changed in its internal structure. And it is time-sensitive, and the function ceases to exist after several washings.