Compared with polypropylene fiber, which development is more advantageous? Nowadays, with the continuous advancement of science and technology, the polypropylene fiber developed from the 1970s to the 1980s has developed rapidly, and its performance has been continuously improved. It is now comparable to polyester fiber, and even better than polyester. The performance of polyester filament is also very superior. It has become the world's largest chemical fiber variety. It currently accounts for about a quarter of the world's chemical fiber output. However, compared with polypropylene, its performance and function are still a lot worse. Will you compare which development is more beneficial?

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

Although polypropylene and polyester are very different in chemical structure, polypropylene is a homopolymer formed by the polymerization of propylene through free radicals, while polyester is a copolymer formed by polycondensation of terephthalic acid and ethylene glycol. The fiber after spinning treatment can meet the requirements of use. For textile fibers, the first is to have appropriate physical and mechanical properties, and the second is the appearance and comfort of the fabric, such as crisp, soft, non-balling, water absorption, and breathability. Polyester fine denier yarn is superior to polyester fine denier yarn.

　　 2. Initial elastic modulus.

　　 indicates the resistance of the fiber to small elongation. The clothing reflects the stiffness when the fiber stretches or bends to a smaller amount. Generally speaking, the larger the initial modulus, the smaller the deformation of the fiber and the better the stiffness. The initial modulus of polyester fiber 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 polyester is 0.91, which is 40% lighter than cotton and 34% lighter than polyester. It is the lightest fiber and the only fiber lighter than water. It shows that polypropylene fiber can be made into the lightest fabric, or the same weight, the largest volume, and the best thermal insulation effect. Therefore, polypropylene fine denier is the best raw material for manufacturing sportswear, swimwear, and military uniforms.

　　Four, wear-resistant.

　　 Because polypropylene fiber is constantly rubbed during use, the wear resistance of the fiber determines the use range and service life of the fiber. Polypropylene has better wear resistance than polyester.

　　 5. Comparison of appearance and wearing comfort of polypropylene, polyester fiber and fabric.

The fine-denier polypropylene filament has a filament dpf (denier of a single fiber) less than 2, which has changed the waxy feel of ordinary polypropylene. It has the disadvantage of poor clothing performance, making fine-denier and ultra-fine-denier polypropylene textile products high Grade products.

　　 Six, permeable drainage.

　　 Water permeability is used to measure the comfort of taking. What we call breathability is the ability to transmit water vapor in the air through the fabric under certain wind speed and time conditions. When the body is sweating, the gaseous sweat is drained well, which makes people feel comfortable; on the contrary, it is impervious to moisture and feels uncomfortable because it adheres to the body. Water absorption refers to the adsorption force of the fabric to the capillary, also known as the wicking effect. The transfer of liquid moisture on the fabric mainly depends on the gap between the fibers on the fabric and the capillary action of the fibers. In addition to surface tension, it is also related to the capillary diameter. As the size increases, its drainage also increases. The results show that the water absorption performance of the fiber varies with the capillarity of the fiber. The finer the fiber, the better the water absorption performance.

In short, fine-denier polypropylene filament is better than polyester filament. Fine-denier polypropylene itself still has excellent functionality, which is unmatched by polyester. The functionality of polyester needs to be changed in its internal structure to have timeliness. After several washings, the function no longer exists.