Which is better, polypropylene or polyester?
1. Performance comparison between fine denier polypropylene filament and polyester filament for clothing
Although the chemical structures of polypropylene fiber and polyester fiber are quite different? Polypropylene is a homopolymer obtained by free radical polymerization of propylene, while polyester is a polymer obtained by polycondensation of terephthalic acid and ethylene glycol, but the fiber obtained by spinning can meet the requirements of wearing. The requirements for taking textile fibers are: first, appropriate physical and mechanical properties; Secondly, the appearance and wearing comfort of woven fabrics, such as stiffness, softness, pilling, water absorption, air permeability and so on. Compared with polypropylene fiber, fine denier filament is superior to polyester fiber.
2. Initial elastic modulus
Represents the resistance of fibers to small elongation. When the fiber is stretched or slightly bent, clothes reflect the hardness of the fiber. Generally speaking, the larger the initial modulus, the smaller the fiber deformation and the better the rigidity. The initial modulus of polypropylene fiber is lower than polyester fiber and higher than nylon fiber, and its fabric flexibility is between polyester fiber and nylon fiber.
3. Relative density
The relative density of polypropylene fiber is 0.9 1, which is 40% lighter than cotton and 34% lighter than polyester. It is the lightest of all fibers and the only fiber lighter than water. This shows that polypropylene can be made into the lightest fabric, or the largest volume or the best warmth retention under the same weight. Therefore, polypropylene fine denier yarn is the best material for making sportswear, swimsuits and military uniforms.
4. Wear resistance
Due to the continuous friction of polypropylene fiber in the process of use, the friction resistance of the fiber determines the application range and service life of the fiber, and the wear resistance of polypropylene fiber is better than that of polyester fiber.
5. Comparison of appearance and wearing comfort between polypropylene fiber and polyester fiber and fabric.
Fine denier polypropylene filament, because its dpf (single fiber denier) is less than 2, changes the waxy feel of ordinary polypropylene in the past, and the clothing usability is poor, making fine denier and ultra-fine denier polypropylene textile products become high-grade products.
6. Permeability and drainage
Permeability and drainage are indicators to measure wearing comfort. The so-called air permeability refers to the ability to make gaseous water in the atmosphere pass through the fabric under certain wind speed and time conditions. When the human body sweats, the gaseous sweat can be discharged well, which will make people feel comfortable; On the other hand, it is airtight and uncomfortable because it sticks to the body. Drainage refers to the capillary attraction of fabric, or wicking effect. Liquid water meets the fabric, which mainly depends on the gap between fibers in the fabric and the capillary action of fibers. The filtration of fiber is not only affected by surface tension, but also related to capillary radius. As the fiber size becomes smaller, its drainage capacity increases. Therefore, drainage varies with the degree of capillary action of fibers. The finer the fiber, the better the wicking effect and the better the drainage.
To sum up, fine denier polypropylene filament is superior to polyester, and fine denier polypropylene itself has excellent functionality, which is incomparable to polyester. The functionality of polyester needs to change in its internal structure, which is time-sensitive. After washing several times, the function no longer exists.
Difference between polyester fiber and polypropylene fiber
One of the differences between polyester and polypropylene is that:
Polyester fabric: a kind of chemical fiber clothing fabric widely used in daily life. Its biggest advantage is good wrinkle resistance and shape retention, and it is suitable for making outerwear clothing. Polyester fabric has high strength and elastic recovery. So durable, wrinkle-resistant, non-ironing.
Polypropylene fabric: It has the lightest specific gravity among all clothing fibers and can float on the water (specific gravity is about 0.9 1g/cm3), but its strength is very good, so it has been widely used in clothing. It has the characteristics of firmness and durability, crisp appearance and good dimensional stability. Mostly used as military raincoats and mosquito nets.
The second difference between polyester and polypropylene: which is more expensive, polypropylene or polyester?
Elasticity of polyester: Elasticity is close to wool, and it can be almost completely recovered after 5% ~ 6% elongation. The crease resistance is better than other fibers, that is, the fabric does not wrinkle and has good dimensional stability. The elastic modulus is 22 ~ 14 1cn/dtex, which is 2 ~ 3 times higher than that of nylon.
Strength and elongation of polypropylene fiber: polypropylene fiber has high strength, large elongation, high initial modulus and excellent elasticity. Therefore, polypropylene fiber has good wear resistance. In addition, the wet strength and dry strength of polypropylene fiber are basically the same, which is an ideal material for making fishing nets and cables.
The difference between polyester and polypropylene: which is better, polypropylene or polyester waterproof?
Polyester: Good water absorption and wear resistance. Wear resistance is second only to nylon, and nylon has the best wear resistance, which is superior to other natural fibers and synthetic fibers.
Polypropylene: hygroscopicity and dyeability Polypropylene has little hygroscopicity and almost no hygroscopicity, and its moisture regain is close to zero under general atmospheric conditions.
The difference between polyester and polypropylene fiber, in fact, fabric is our frequent contact partner in life, especially the difference between polyester and polypropylene fiber needs to be well understood!
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