Polyester is usually a polymer compound obtained by polycondensation of a dibasic acid and a diol. Among them, a fiber having a polyethylene terephthalate content of 85 or more is mainly referred to as polyester, which is internationally called For polyester fiber. It is the simplest one of the three synthetic fibers and the price is relatively cheap. In addition, it is durable, elastic, non-deformable, corrosion-resistant, insulated, crisp, easy to wash and dry, and so on. First, the structure: From the molecular composition of polyester, it is composed of a short aliphatic hydrocarbon chain, an ester group , a benzene ring , and a terminal alcohol group. In addition to the presence of two terminal alcoholic hydroxyl groups in the polyester, there are no other polar groups, and thus the polyester fibers are extremely poor in hydrophilicity. Polyester has about 46% ester group. The ester group can be hydrolyzed and pyrolyzed at high temperature. When it is alkali, it will be hydrolyzed to reduce the degree of polymerization. Polyester molecules also contain aliphatic hydrocarbon chains, which can make polyester molecules have certain Flexibility, but because there are benzene rings in the polyester molecule that cannot be rotated inside, the polyester macromolecules are basically rigid molecules, and the molecular chains are easy to maintain the linear shape. Therefore, the polyester macromolecule easily forms crystals under this condition, so the crystallinity and orientation of the polyester are high. Second, the characteristics: The morphological structure observed in the microscope of the polyester obtained by the melt spinning method has a circular cross section and no special longitudinal structure . Filamentous fibril structure can be observed under an electron microscope. The shaped fiber can change the elasticity of the fiber, so that the fiber has special luster and bulkiness , and improves the cohesion and coverage of the fiber, as well as anti-pilling and static reduction . performance. For example, the triangular fiber has a glittering effect ; the five-lobed fiber has a lustrous luster, has a good hand feeling, and is resistant to pilling ; the hollow fiber has a small density and good warmth due to a cavity inside . Third, the characteristics: 1. High strength . The short fiber strength is 2.6 to 5.7 cN/dtex, and the high strength fiber is 5.6 to 8.0 cN/dtex. Due to its low hygroscopicity, its wet strength is essentially the same as the dry strength . The impact strength is 4 times higher than that of nylon and 20 times higher than viscose . 2. Good elasticity . The elasticity is close to that of wool , and when it is stretched by 5% to 6%, it can be almost completely recovered. The wrinkle resistance is superior to other fibers , that is, the fabric is not wrinkled, and the dimensional stability is good. The modulus of elasticity is 22 to 141 cN/dtex, which is 2 to 3 times higher than that of nylon . Polyester fabric has high strength and elastic recovery, so it is durable, wrinkle-free and non-iron. 3. Heat resistance . Polyester is made by melt spinning, the fibers forming the melt may be heated again, it is thermoplastic fibers. Polyester has a higher melting point and a smaller specific heat capacity and thermal conductivity, so the heat resistance and heat insulation of the polyester fiber are higher. It is the best among synthetic fibers. 4. Good thermoplasticity and poor resistance to melting . Polyester is the most heat-resistant fabric in synthetic fabrics due to its smooth surface and tight internal molecules. It is thermoplastic and can be made into pleated skirts with long pleats. At the same time, the polyester fabric has poor resistance to melting, and it is easy to form holes in the case of soot or Mars . Therefore, wear should avoid contact with cigarette butts, sparks, etc. 5. Good wear resistance . Wear resistance is second only to nylon with the best abrasion resistance , better than other natural and synthetic fibers. 6. Good light resistance . Lightfastness is second only to acrylic . Polyester fabrics have better lightfastness, and their lightfastness is better than natural fiber fabrics except for acrylic fibers. Especially in the back of the glass, the light fastness is very good, almost the same as acrylic fiber. 7. Corrosion resistant . It is resistant to bleaches , oxidants, hydrocarbons, ketones, petroleum products and inorganic acids . Resistant to dilute alkali, not afraid of mildew , but hot alkali can decompose it . Also has strong acid and alkali resistance and UV resistance 8. Dyeing is poor , but the color fastness is good and it is not easy to fade . Because there is no specific dyeing group on the polyester molecular chain, and the polarity is small, the dyeing is difficult, the dyeability is poor, and the dye molecules are not easy to enter the fiber. 9. Poor hygroscopicity, wearing a stuffy feeling on the body, and easy to bring static electricity, staining dust , affecting the beauty and comfort. However, it is easy to dry after washing, and the wet strength is hardly reduced, it is not deformed, and it has good washing and wearability . The official moisture regain rate is only 0.4% . summary: The fabric woven from ordinary polyester filament has the advantages of good strength , smooth and crisp , easy to wash and dry , but has the feeling of hard hand, poor touch, soft gloss, poor breathability, poor moisture absorption, etc. Disadvantages . If the difference is larger than that of the silk fabric, the silk must first be simulated on the silk structure to eliminate the disadvantage of poor performance. Fourth, the development situation: Polyester is the world's largest and most widely used synthetic fiber variety, with polyester accounting for more than 60% of the world's synthetic fiber production. It is widely used in textiles such as clothing, bedding , various decorative fabrics , special fabrics for national defense and other industrial textiles, such as filter materials, insulating materials , tire cords, conveyor belts, etc. With the sustained and rapid growth of the domestic economy and the continuous improvement of the consumption power of domestic residents, the demand for polyester staple fiber in the domestic region is also growing. The production capacity of China's polyester series products is growing at an alarming rate. The rapid growth of polyester fiber production capacity has made China gradually become an important processing base for the world's polyester products. With the continuous rapid growth of China's economy and the continuous improvement of domestic consumption power, the demand for domestic polyester fiber is also growing. China's polyester fiber production capacity has grown at an alarming rate, making China gradually become an important processing base for the world's polyester products, and has become the world's largest producer of polyester fiber. From 2001 to 2007, the market scale of China's polyester fiber industry showed an upward trend year by year. The market scale increased from 57.362 billion yuan in 2001 to 236.414 billion yuan in 2007, with a compound annual growth rate of over 10.00%. Polyester fiber is the most processed chemical fiber variety among all textile fibers . Developing differentiated varieties, increasing the added value of products, and improving the economic benefits of enterprises are of vital importance to the entire chemical fiber industry. Product differentiation is the development direction of polyester. China's polyester fiber producers are also developing in this direction. Therefore, the polyester industry still has great development potential. Please indicate the source. If you like sport SHAOXING LIDONG TRADING CO.,LTD , https://www.lidong-garments.com
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