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1. Characteristics of polypropylene fiber fabrics Polypropylene fiber is the lightest of all clothing fibers and is a fiber that can float on the water (specific gravity is about 0.91g/cm3), but its strength is very good, so it is widely used in clothing. application. The characteristics of polypropylene fabrics are:
(1) Polypropylene is one of the light-weight fabrics. Its weight is only 3/5 of that of cotton. Therefore, it is suitable for fabrics for winter clothing such as flocculation or skiwear, mountaineering, etc. It can also be used for making ropes, fishing nets, and filter cloths.
(2) The moisture absorption of the polypropylene fabric is extremely small, and the moisture regain is regarded as 0%. Therefore, its clothing is known for its advantages such as quick drying, very cool, and no shrinkage. However, it has poor comfort and poor dyeability. Since the polypropylene film is easily broken in the direction perpendicular to the stretching, it is mostly used in the wrapping cord.
(3) The polypropylene fabric has good strength and wear resistance, and the clothing is fast and durable.
(4) Polypropylene fabric is resistant to corrosion, but it is not heat-resistant, light-resistant and easy to age.
(5) Polypropylene fabrics have good stability to inorganic acids and bases and are less stable to organic solvents.
2. Polypropylene fabrics are available in the pure polypropylene, blended, and interwoven categories. Among them, blended and blended fabrics are mostly associated with cotton fibers, such as C/cotton, C/C, etc.; and pure polypropylene fabrics. It is represented by a paligy coat.
(1) Paili cashmere coat is made of liquid dyed polypropylene fleece woven wool-like fabrics, with a unique style of face terry, bright color appearance, light texture and warm, strong sense of hair, its biggest advantage is easy to wash Fast drying, inexpensive and affordable. Suitable for youth and children's coats.
(2) The C/cotton and hemp yarn is woven with C/cotton 65/35 blended yarn, which is strong and durable, with good appearance and good dimensional stability. Use mostly military raincoats, mosquito nets, etc.
(3) C/Cotton
Polypropylene
Polypropylene is the trade name of polypropylene fiber. It is a fiber made from propylene as a raw material through polymerization and melt spinning. Polypropylene officially began its industrial production in 1957 and is a rising star in synthetic fibers. Because polypropylene has the advantages of simple production process, low cost, high strength, and relatively light density, polypropylene has developed rapidly. At present, polypropylene is the fourth largest variety of synthetic fibers.
The main physical and chemical properties of polypropylene
1. Polypropylene's vertical surface is smooth and the cross section is circular.
2. The biggest advantage of density polypropylene is its light texture. Its density is only 0.91g/cm3, which is the lightest density among common chemical fibers.
3. Strong stretch polypropylene has high strength, large elongation, high initial modulus and excellent elasticity. Therefore, polypropylene wear resistance is good. In addition, the wet strength of polypropylene is basically equal to dry strength.
4. Hygroscopicity and dyeability Polypropylene's hygroscopicity is very small, almost no moisture absorption, and the moisture regain is close to zero under normal atmospheric conditions. However, it has a wicking effect and can transmit water vapor through the capillary in the fabric without any absorption by itself. Polypropylene has poor dyeability and incomplete chromatogram, but it can be used to make up for deficiencies.
5. Acid-resistant and alkali-resistant polypropylene has good chemical resistance. In addition to concentrated nitric acid and strong caustic soda, polypropylene has good resistance to acid and alkali.
6. Lightfastness and other polypropylene light resistance is poor, thermal stability is also poor, easy aging, intolerance ironing. However, anti-aging properties can be improved by adding anti-aging agents during spinning. In addition, polypropylene has good electrical insulation, but static electricity is easily generated during processing.
Second, chemical fiber
(1) According to the source of polymer
1 Regenerated fiber: It is a chemical fiber that is made of natural polymer, chemically and mechanically, and has the same chemical composition as the original polymer.
2 Synthetic fibers: chemical fibers made by artificially synthesizing polymers obtained from monomers made from low-molecular molecules such as petroleum, coal, natural gas, and some agricultural and sideline products.
(2) According to internal components
1 Polyester fiber (PET): polyethylene terephthalate fiber
2 Polyamide Fibers (PA)
3 Polyacrylonitrile fiber (PAN)
4 Polyvinyl formal fiber (PVA)
5 Polypropylene Fiber (PP)
6 PVC fibers
7 Polyurethane fiber
(3) According to the morphological structure
Filament: Continuous filaments processed from chemical fibers, not slicing. Divided into monofilaments, multifilaments and textured yarns.
Short fibers: Chemical fibers cut into short fibers of various lengths in post-processing.
Shaped fiber: refers to a chemical fiber with a special cross-sectional shape that is spun through a given geometry of the spinning orifice.
4 Composite fiber: A chemical fiber made of two or more polymers, or the same polymer with different properties, spun by composite spinning. Separate side-by-side type, skin core type and island core.
5 Microfiber: refers to a fiber with a small monofilament density, also known as a microfiber.
According to the linear density range can be divided into:
Fine fiber (0.44 ~ 1.11dtex)
Super fine fiber (0.011~0.44dtex)
(4) by usage
1 ordinary fiber
2 Special fiber: refers to a chemical fiber that has a special physicochemical structure, function or purpose, and some of its technical indicators are significantly higher than conventional fibers.
Including: 1. Fibers with special mechanical properties
2. Fibers with special thermal properties
3, chemically stable fiber
4. Fibers with special physical properties
5, fiber with special physical and chemical properties
6, fiber with special biological properties
Such as: high temperature resistant fiber, radiation resistant fiber, high humidity high modulus fiber
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