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Modified Fiber Physical Modification
Aug 01, 2017

Modified Fiber Physical modification

At present, the quality, quantity and efficiency of Chinese clothing and textile exports are increasing year by year. At the same time, clothing consumption patterns show a diversified trend, not only to meet the growing consumer demand, but also to promote the textile industry chain to scientific and technological innovation, cultural value-added, green and sustainable development direction, which will enable our country Textile, garment industry, the global market competitiveness continues to increase. Over the past two decades, China's chemical fiber industry has made rapid development, according to official data show that in 2010 China's chemical fiber production of 30.879 million tons in 2014 to 44,326,700 tons. We can see the increasing use of chemical fiber usage in China. One of the largest polyester fiber production, chemical fiber for the total three quarters. With the development of polyester fiber, its performance has been in the hygroscopic, antistatic, fire resistance and other aspects have been unable to meet people's needs. This paper mainly describes the three properties of polyester fiber physical and chemical properties of the improvement, and thus to meet people's needs.

The modification of the polyester fiber can be carried out in the process of polymerization, spinning and fiber processing . Modification methods can be roughly summarized into two categories: a. Physical modification is mainly in the fiber processing conditions to do a series of changes. Blending, compound and by changing the morphology and other methods to achieve the purpose of modification. Composite and blended only limited to the special field of modification, and change the form of the way, still can not get as natural fiber as the ideal effect, but in the appearance of more intuitive. B. Chemical modification of chemical modification process is relatively simple, of course, easier to achieve our goal. But its flaw is that the durability is relatively poor. Such as surface treatment, copolymerization (introduction of the third component in the polyester chain), and blending (addition of modified additives during the manufacture of the polymer). At that time, copolymerization and blending were complicated in the process and often affected some of the physical properties of the product. Such as reduced strength.

Clothing in the process of wearing, often encountered damp, washing, drying and other changes. In these changes, the fiber raw materials made of clothing sometimes absorb liquid water (often referred to as water absorption), sometimes absorb gaseous water, and sometimes can emit gaseous water, so that clothing gradually dry. This ability to absorb and release gaseous water is called the hygroscopicity of the fibers. The general hygroscopicity is expressed by the moisture regain W (%). As the polyester surface is smooth, the internal molecules are closely arranged, the lack of hydrophilic structure between molecules, so the moisture absorption rate is very small, in the standard atmospheric conditions only 0.4% moisture regain, poor moisture absorption, summer clothing has a hot feeling, people Feel discomfort.

The most important reason for the absorption of water molecules in the air is that there is a hydrophilic chemical group in the molecular structure of the fibers. In the commonly used fibers, the hydrophilic groups are -OH, -COOH, -NH2, CONH, -CN and so on several. The stronger the polarity of the hydrophilic group, the stronger the ability to absorb water molecules, the better the hygroscopicity. Of course, the more the number of hydrophilic groups, the stronger the hygroscopicity. In addition, the crystal area of the fiber is neatly arranged because of the molecular arrangement, the gap is relatively small, the water molecules are difficult to enter; and the non-crystalline region is irregularly arranged, the gap is relatively large, the water molecules are easy to enter, so the high crystallinity of the fiber is poor. Some of the water molecules absorbed by the fiber are adsorbed on the surface of the fiber's surface or internal voids, so the larger the surface area of the fiber, the more water molecules that can be adsorbed. Polyester fiber does not exist within the hydrophilic group, its moisture only by surface adsorption. Natural fiber in the growth process there are some sugar, gum, these substances have a greater capacity, so the separation of these substances before and after the fiber's moisture absorption capacity is also different.