超滤膜分级对木质素磺酸盐作为抑尘剂性能的影响

发布时间：2018-04-12 09:58

本文选题：木质素磺酸盐 + 分子质量　；参考：《林产化学与工业》2017年06期

【摘要】：采用截留分子质量为6 000和20 000 u的两种超滤膜对木质素磺酸盐进行过滤分级,获得3种不同分子质量木质素磺酸盐级分(LG-1、LG-2和LG-3),分析了各级分的得率、纯度、分子质量及亲水基团含量,并考察了各级分作为抑尘剂的性能差异。结果表明:通过超滤膜过滤可以对木质素磺酸盐进行有效分级,LG-1、LG-2和LG-3的得率分别为58.32%、24.50%和17.18%,重均相对分子质量分别为4 841,15 239和37 768,分散度(M_w/M_n)分别为2.78、2.40和2.06。随着木质素磺酸盐级分相对分子质量增加,灰分含量降低,总糖含量增加;同时磺酸基团含量降低。超滤膜分级对木质素磺酸盐作为抑尘剂的性能具有显著的影响,随着截留分子质量的增加,木质素磺酸盐吸湿能力、抗压及抗风蚀能力都有所提高,分别提高了96.43%、55.11%和63.07%,表明高分子质量木质素磺酸盐级分(LG-3)作为抑尘剂表现出更好的性能。SEM分析表明,喷洒木质素磺酸盐溶液后,沙粒之间有粘结层,表现出一定的粘结性和结壳性,且截留分子质量越大粘结现象越明显。
[Abstract]:Two ultrafiltration membranes with molecular weight of 6 000 and 20 000 u were used to filter and classify lignosulfonate. Three different molecular weight lignosulfonate fractions, LG-1, LG-2 and LG-3, were obtained. The yield and purity of different fractions were analyzed.Molecular weight and hydrophilic group content were investigated.The results showed that the effective fractionation of lignosulfonate by ultrafiltration membrane was obtained by LG-1 LG-2 and LG-3, the yields of LG-1G-2 and LG-3 were 58.32% and 17.1850%, respectively, the relative molecular weight was 4841 ~ 15239 and 37 768, and the dispersion of M _ (w / M _ n) was 2.782.40 and 2.06 respectively.With the increase of molecular weight of lignosulfonate fraction, the ash content and total sugar content decreased, while the sulfonic group content decreased.Ultrafiltration membrane classification has a significant effect on the performance of lignin sulfonate as dust suppressant. With the increase of retention molecular weight, the hygroscopicity, pressure resistance and wind erosion resistance of lignosulfonate are improved.55.11% and 63.07% were increased, respectively, indicating that the macromolecule lignosulfonate fraction LG-3 showed better performance as dust suppressant. SEM analysis showed that after spraying lignosulfonate solution, there was a bonding layer between sand particles.The larger the molecular mass is, the more obvious the bonding is.
【作者单位】：天津科技大学造纸学院天津市制浆造纸重点实验室;浙江科技学院浙江省废弃生物质循环利用与生态处理技术重点实验室;中国林业科学研究院林产化学工业研究所国家林业局林产化学工程重点开放性实验室;
【基金】：天津科技大学大学生创新创业训练计划项目(201610057119) 天津市制浆造纸重点实验室开放基金(201607) 浙江省废弃生物质循环利用与生态处理技术重点实验室开放基金(2016REWB21)
【分类号】：O636.2;TQ028.8

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