【摘要】 采用打浆-高压均质法以漂白针叶浆为原料,制备了纤维素微纳米纤丝(CMF)。研究了打浆过程中纸浆纤维特性的变化,均质工艺对CMF微纤丝形态和尺度的影响规律。研究结果表明:打浆可有效降低纤维的长度、促进纤维细纤维化,通过控制打浆时间(0～240 min),可将纤维的加拿大游离度(CSF)调控在800 mL到0 mL之间、纤维长度对应2.3 mm和0.43 mm之间。随着高压均质次数、压力和纤维质量浓度的增加,机械作用力增强,微纤丝化作用加大,CMF的宽度下降,其宽度分布趋于集中。通过控制均质次数(1～20次)、压力(50～110 MPa)和纤维质量浓度(0.1%～0.5%)的变化,可制备宽度为134～406 nm之间的多尺度CMF。打浆-高压均质法可作为环境友好的多尺度CMF制备方法。更多还原

【Abstract】 Cellulose microfibril(CMF) was prepared from bleached softwood pulp by beating-high pressure homogenization process. The change of pulp fiber properties in beating process and the effects of homogenization process on the morphology and scale of CMF were studied. The results indicated that the beating process could effectively reduce the length of fiber and promote fiber microfibrization. The fibers with the Canadian standard freeness(CSF) of 0-800 mL and the length of 0.43-2.3 mm could be obtained by controlling the beating time 0-240 min. With the increase of homogenization passes, pressure and fiber mass concentration in homogenization process, the mechanical force strengthened, the microfibrization increased, the width of CMF decreased, and its width distribution tended to be concentrated. The multi-scale CMF with width from 406 nm to 134 nm could be prepared by controlling could the changes of homogenization passes(1-20 times), pressure(50-110 MPa) and fiber mass fraction(0.1%-0.5%). The beating-high pressure homogenization process could be used for environmentally friendly preparation of multi-scale CMF.更多还原