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Preparation and Properties Study on Super Absorbent PVA Fiber

Author: LiGuoXing
Tutor: YinBaoZuo
School: Donghua University
Course: Textile Engineering
Keywords: Polyvinyl alcohol (PVA) fibers Chemical crosslinking network Superabsorbent fiber Absorbency Water retention properties
CLC: TQ342.4
Type: Master's thesis
Year: 2010
Downloads: 234
Quote: 0
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Abstract

Superabsorbent fiber is a fiber developed on the basis of high water-absorbing resin. Superabsorbent fiber absorbent capacity and ensure water and strong after absorbing water still has a good strength to maintain the integrity of the fiber absorbent and easy processing, high absorbent fibers broad application prospects. At present, only a few developed countries are able to produce high absorbent fibers, and research is in its infancy in the country superabsorbent fiber. The subject to the low-temperature water-soluble PVA fiber as raw material, and maleic anhydride as the crosslinking agent, the PVA fibers in the network structure is formed after the chemical crosslinking reaction to superabsorbent PVA fiber was prepared and tested for various properties. The main content is as follows: The effect of the chemical crosslinking reaction conditions i.e. crosslinking temperature, the crosslinking time and maleic anhydride, the amount of the water absorbency of the superabsorbent polymer PVA fibers. The results show that with the increase in the amount of maleic anhydride, water absorption times the first increases and then decreases; crosslinking temperature and crosslinking time on the water absorbency. 5:100 to 25:100 in the amount of maleic anhydride, and the crosslinking temperature was 75 ° C to 95 ° C, the crosslinking time of 1 to 5 hours under conditions appropriate high crosslink density absorbent PVA fibers can be obtained when the cross linking time of 3h, crosslinking temperature of 85 ° C, the amount of maleic anhydride 20:100, good water absorbency fiber up to 135 times. The alkali treatment conditions for the water absorption rate of super absorbent PVA fibers. The test results show that the alkali treatment may be effective to improve the water absorption rate of the PVA fibers superabsorbent. Alkali treatment conditions were as follows: the concentration of NaOH 3%, alkali treatment time 4min when the obtained high water absorption rate of water-absorbing PVA fibers will soon reach the saturated amount of water absorption half simply 6S, considerably higher than the high water-absorbing resin absorbent rate. The water retention capacity of the super absorbent PVA fibers. Ming test results by 1000 times the weight of pressure, water retention can still reach more than 60%, in line with the requirements of the high water holding capacity of the superabsorbent fiber, water-holding capacity of the superabsorbent PVA fibers under pressurized conditions. Molecular structure and surface morphology of the superabsorbent PVA fibers were characterized by infrared spectroscopy and scanning electron microscopy (SEM). The infrared spectrum shows a change occurs through chemical cross-linking after the PVA-macromolecular structure, maleic anhydride grafted to PVA macromolecule, network formation of crosslinking between the PVA macromer has played the role of a \Superabsorbent longitudinal surface of the PVA fiber of the SEM photograph showing the fiber surface there are a large number of grooves and slits, is conducive to the improvement of water-absorbing rate and absorbency. The mechanical properties of super absorbent PVA fibers. The test results show that the super absorbent PVA fiber strength to meet the requirements of the non-woven processing, suitable for processing absorbent non-woven material. In short, the use of chemical crosslinking method will super absorbent PVA fiber, low-temperature water-soluble PVA fiber to meet the high performance requirements of the absorbent fibers, suitable for non-woven processing, further study of non-woven processing.

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CLC: > Industrial Technology > Chemical Industry > The chemical fiber industry > Synthetic fiber > Polyvinyl alcohol Department of fibers
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