疏水改性羧甲基纤维素及其在废纸脱墨中的应用

Application of Hydrophobic Carboxymethyl Cellulose in Deinking

摘要: 以DMAc为溶剂,三乙胺为缚酸剂,十二酰氯为反应试剂,对羧甲基纤维素进行疏水改性,制备表面活性剂十二烷基酯化的羧甲基纤维素(CMC-R)。羧甲基纤维素与十二酰氯的质量比为1:0.4 ,反应最佳温度为60 ℃,时间5 h。将合成的纤维素基表面活性剂CMC-R应用于旧新闻纸(ONP)脱墨,结果表明,单独使用CMC-R能提高废纸浆白度2.2%(ISO),纸浆的残余油墨量减少457.66 mm2/m2,减少了29.4%。而CMC-R与非离子表面活性剂脂肪醇聚氧乙烯醚(JFC)复配后,白度较CMC-R单独使用提高2.13%(ISO),残余油墨量减少3.18%。

Abstract: Lauroyl chloride esterified carboxymethyl cellulose(CMC-R) was prepared by carboxymethyl cellulose (CMC) and lauroyl chloride in the presence of triethylamine as acid binding agent and DMAc as solvent.The optimized CMC-R could be obtained as thecarboxymethyl cellulose reacted with lauroyl chloride with a ration of 1:0.4 (m/m) at 60 ℃ for 5 h.CMC-R was utilized in old news paper (ONP) deinking. The results revealed that individual application of CMC-R could improve the pulp brightness by 2.2%(ISO),and the residual ink decreased by 457.66 mm2/m2.Another increase of pulp brightness by 2.13% and reduction of residual ink by 3.18% could be realized when CMC-R and non-ionic surfactants were utilized together.