纸浆纤维的试剂法改性及其对滤纸性能的影响

Pulp Fiber Modification with NaOH-urea-thiourea Solution and Its Effects on the Property of Filter Paper

关键词:  纸浆纤维  试剂  超声波  改性  滤纸

Key Words:pulp fiber  solution  ultrasound  modification  filter paper

摘要:采用NaOH、尿素、硫脲等调配纸浆纤维改性试剂,先对纸浆纤维进行试剂改性,再采用超声波协同处理,利用改性纤维抄造高透气性能滤纸，探讨改性试剂质量分数、超声波功率、超声波处理时间等因素对改性效果的影响,通过对比分析改性前后纸浆纤维形态变化及所抄造滤纸的透气度、平均孔径、最大孔径、松厚度、零距抗张强度等指标来评价改性效果。结果表明,当改性试剂质量分数30%、超声波功率600 W,超声波处理时间15 min时,纤维改性效果最佳；且纤维发生了明显的润胀，有一定的分丝和微纤化现象,所抄造滤纸透气度由未改性的157.57 L/(m²·s)提高到1041.16 L/(m²·s)；平均孔径由35.171 μm提高到47.498 μm；最大孔径由39.178 μm提高到49.712 μm；松厚度由3.16 cm³/g提高到5.22 cm³/g。

Abstract:Pulp fibers were modified in aqueous NaOH-urea-thiourea solution and treated with ultrasonic to prepare high-permeability filter paper. Effects of the agent concentration, ultrasound power and time of ultrasound treatment were studied. Comparing the morphological change of the fibers in modification and the main parameters of the filter papers (permeability, pore size, bulk, and zero-span tensile strength) prepared with treated and untreated fibers to evaluate the effect of modification. The results showed that the ultrasound treatment process was most favorable at 600 W for 15 min and the agent concentration was 30%, obviously swelling and fibrillation of the fibers, took place under the conditions. The permeability increased from 157.57 L/(m²·s) to 1041.16 L/(m²·s),average pore size increased from 35.171 μm to 47.498 μm, maximum pore size increased from 39.178 μm to 49.712 μm, the bulk increased from 3.16 cm³/g to 5.22 cm³/g for the paper prepared with untreated and treated fibers respectively.