低共熔溶剂耦合机械打浆制备微纳米纤维素的研究

本研究选取“绿色”低共熔溶剂(DES,乳酸/盐酸甜菜碱)添加不同体积分数去离子水,对桉木片进行预处理,并结合打浆和氧化处理方式,对木质纤维素进行微纳米纤维化研究。结果表明,该DES在添加体积分数5%去离子水时,具有最佳的预处理效果,即纤维素的保留率为62.9%、半纤维素和木质素的去除率分别为91.8%和82.9%,且纤维素保持Ⅰ型结晶结构。经过打浆和氧化处理后木质纤维素细纤维化作用明显,纤维质均长度和质均宽度分别减小了47.7%和49.9%,使得纤维表面电荷明显增强,Zeta电位绝对值最大达到51.65 mV。

磺化化学机械浆生产实践

着重探讨实际生产中磺化化学机械浆（ＳＣＭＰ）质量的控制与调节，产量的准确计量办法。

制取可降解纤维地膜的秸秆纤维特性研究

原料的特性在很大程度上决定了产品的特性及加工工艺,因此对制成可降解纤维地膜的原料秸秆纤维进行物理化学及机械打浆特性研究具有重要意义。本研究采用Leica显微镜测定秸秆纤维形态,SPSS17.0统计分析纤维长宽比,Design-expert6.0.10区组对比分析两种秸秆、纤维间理化及机械打浆特性差异和经机械加工后纤维成分含量变化。试验结果表明,大豆秸秆纤维的长度、宽度及长宽比分别是17mm、1887μm、17,茄秆纤维的长度、宽度及长宽比分别是11mm、1338μm、20;大豆秸秆纤维素含量48.7%,半纤维素含量12.7%,木素含量为15.65%,茄子秸秆纤维素含量34.31%,半纤维素含量11.03%,木素含量为10.69%;经机械加工大豆秸秆半纤维素含量显著增加、纤维素和木素含量显著降低,茄子秸秆经机械加工后半纤维素和木素显著增加,纤维素差异不显著;大豆秸秆纤维中纤维素含量比茄秆纤维中显著增加,木素含量显著降低,更适合经机械加工成膜。

Effects of Refining on the Fiber Properties of Poplar APMP

Poplar alkaline peroxide mechanical pulp （APMP） was refined in a PFI mill at varied revolution and the properties of the refined fibers and the resulting hand sheets were tested. The raw poplar APMP fibers are stiff and have been detached from the lamella during APMP pulping process. During the refining process, the APMP fibers did not swell and fibrillate; they were easily broken and formed into fragments. The breaking length of formed hand sheets increased as the heating degree increased because lots of hydrogen bonds were formed between fibers and fine pieces. The tear strength of hand sheets first increased and then decreased as the beating degree changed from 17 to 70~SR. The maximum tear strength was achieved at 61 ~SR of the beating degree. These results indicated that the hydrogen bond between the fibers was the main factor influencing the tear index followed by the fiber length. Along with the increase of the beating degree, the sheet density increased while the opacity decreased.