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4Â¥2011-05-27 16:28:40
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Mally89: ¹û¶ÏÒªµ¶¨°¡~~~~~~ 2011-05-27 19:40:54
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2Â¥2011-05-27 16:21:47
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Mally89(½ð±Ò+1): ¸ÐлӦÖú£¡~»¶Ó³£À´£¡~ 2011-05-27 19:41:15
Mally89(½ð±Ò+1): ¸ÐлӦÖú£¡~»¶Ó³£À´£¡~ 2011-05-27 19:41:15
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PVA and HEC are water-soluble. We used 3-chloro-2-hydroxypropyl trimethyl ammonium chloride as etherifying agent to introduce quaternary ammonium groups into the structure of PVA and HEC through quaternization reaction to prouduce quaternized QPVA and QHEC, respectively. The effect of reaction conditions on the degree of substitution and reaction efficiency were studied. For HEC, the HEC dosage of 5g, etherification agent is 7.5g, alkali 1.85g, at 65 ¡æ for 2 hours, the optimal degree of substitution obtained QHEC 0.61, the reaction efficiency was 64%.(Õâ¾ä»°Ã»ÓÐνÓºÃºÃ¸Ä¸Ä~ for the PVA, the PVA concentration of 5%, etherification agent is 7g, alkali 2.5g, at 65 ¡æ for 6 hours, get QPVA optimal degree of substitution 3.95. £¨Í¬ÉÏ£© |
3Â¥2011-05-27 16:22:46
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5Â¥2011-05-27 17:17:04














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