ES fiber is a kind of composite fiber with skin core structure, which is commonly used in sanitary products industries such as Walker pants. When the temperature reaches the melting point of the cortex, the surface polymer begins to soften and melt, and the core layer still maintains a stable morphological structure. PP, PE and pet are three commonly used polymer raw materials. PE is the cortex of ES fiber, and PP and pet are the cortex.
Under the scanning electron microscope, the polyester fiber samples were made and the cross-sectional morphology of polyester fiber was observed. The longitudinal section surface of super Imitation cotton polyester and ES fiber is smooth. The cross section of super Imitation cotton fiber is polygonal (because the fibers squeeze each other when slicing). A boundary line can be vaguely seen from the middle of the fiber, which is speculated to be the cross section formed by modification or grafting in the process of fiber spinning; The cross section of ES fiber clearly shows the delamination phenomenon of skin and core, which is similar to ES fiber with PE / Pet structure.
Super cotton like polyester is composed of 5 X-ray diffraction peaks, while ES fiber is only composed of 2 X-ray diffraction peaks. It may be 4080 ES fiber at 15-30 & deg; Only one diffraction peak is formed between the diffraction angles, because the surface and core are pet. The diffraction curves of ordinary polyester and super cotton like polyester are basically the same, while that of super cotton like polyester is at 35 deg; The diffraction angle has a diffraction peak, which may be related to the graft group.
The tensile properties of polyester fiber were tested by xq-2 electronic single fiber strength tester. The tensile strength and elongation of ES fiber are higher than those of ordinary polyester and super cotton like polyester, mainly because the fiber fineness of ES is more than twice that of ordinary polyester and super cotton like polyester. Because of grafting modification, the integrity of super cotton like polyester fiber will be reduced, and the tensile property is only half of that of ordinary polyester. However, due to the grafting of nylon 66, it can be seen that nylon 66 has high elasticity, and its elongation is about twice that of ordinary polyester.
Use the optical contact angle measuring instrument to measure the contact angle of polyester fiber, arrange the fiber neatly, comb it into a straight line, and bond it to the carrier. The main body of the three polyester fibers is pet, and pet is hydrophobic fiber, which is 128.1 & deg respectively; (super Imitation cotton polyester), 139.2 & deg; (ordinary polyester), 140.5 & deg; (ES fiber). Because the super cotton like polyester fiber is modified by grafting nylon 66, it can be seen that the moisture regain of nylon 66 is about 4%, which has a certain hydrophilicity. Therefore, the hydrophobic angle of super cotton like polyester should be slightly smaller, but its grafting content is very low, so it can not make its hydrophobic angle less than 90 & deg;, Become hydrophilic fibers.
Dry a certain quality of polyester fiber, put it into yg601 computer fabric moisture permeable device, adjust the temperature and humidity, and measure the moisture regain of polyester fiber. The hygroscopic properties of super cotton like polyester were tested from 10% to 90% relative humidity at 20 ℃, and compared with skimmed cotton fiber and ordinary polyester. With the increase of relative humidity, the amount of water vapor in the air increases and the hygroscopicity of the fiber improves. Absorbent cotton is a cellulose fiber with good hygroscopicity. The relative humidity is 90% and its moisture regain can reach 12.6%. Compared with super cotton like polyester and ordinary polyester, with the increase of relative humidity, the moisture regain of super cotton like polyester is 1.5 times that of ordinary polyester. This is because the hydrophilic group nylon 66 is grafted, which improves its moisture regain.
The test of polyester fiber of toddler pants aims to judge whether the material can be well applied to products. Through the comparative analysis of various data, the material is more in line with the performance requirements of toddler pants. When the technology is mature, it must be widely used.