以氯乙酸改性壳聚糖制备羧甲基壳聚糖(CMCS)降尘剂的最佳反应条件为m(壳聚糖)/m(NaOH)＝1．0,m(氯乙酸)/m(壳聚糖)＝1．25,50℃下反应7 h；用IR、XRD表征了CMCS；CMCS投加量0．8 g/L,在p H 值为3．5、温度21℃时,对于煤尘的去除率高达95．3％,且具有低残留、易降解、无污染等独特优点,在降尘领域中有着良好的应用前景.
In this paper,a carboxymethyl chitosan dust fall agent (chloroacetic acid modified chitosan,abbrevia-ted as CMCS)has been prepared and characterized by FT-IR,XRD.The optimal synthetic condition was ob-tained as follows:m(chitosan)∶m(sodium hydroxide)=1.0,m(chloroacetic acid)∶m(chitosan)=1.25,reac-tion temperature was 50 ℃,reaction time was 7 h.When the dosage was 0.8 g/L,pH was 3.5,temperature is 2 1 ℃,its dust fall rate could reach 9 5 .3%,and it has low residue,easy degradation and no pollution.The CMCS dust fall agent has good application prospect in the field of dust.
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