玉米秸秆高得率浆细小组分特性及其对纸浆性能影响

Characteristics of Fines in Corn Stover High Yield Pulp and Its Influence on Pulp Properties

以整株玉米秸秆为原料,采用环境友好型水热预处理与磨浆处理结合,制得一种高得率浆,并对细小组分进行高压均质(60 MPa)处理,重点对细小组分含量和形态变化对抄造纸张性能的影响进行了探讨。结果表明,玉米秸秆高得率浆保水值大,浆中细小组分含量高,对纸浆强度和滤水性能有较大影响,当筛除30.7%细小组分时,纸浆的抗张强度、耐破度和环压强度均高于未筛分浆。采用高压均质处理能改变细小组分形态,向玉米秸秆高得率浆的纤维组分中添加20%高压均质处理的细小组分时,与未筛分浆相比,打浆度和未筛分浆相近,抗张指数提高30.8%、耐破指数提高59.5%、环压指数提高25.2%。

A kind of high yield pulp was prepared from whole corn stover using environment-friendly hydrothermal pretreatment method.On the basis of studying the characteristics of fines in the pulp,the effects of the content and change of morphology of fines on the properties of pulp were discussed.The corn stover high yield pulp had high water retention value and high fine fraction content.Fines content had a great influence on strength and dewatering performance of the pulp.When 30.7%of the fines were removed,the tensile strength,burst strength and ring crush strength were higher than those of original pulp.High-pressure homogenization treatment could change the shape of fines,when adding 20%fines with high pressure homogenization to the fiber fraction of high-yield corn stover pulp,the degree of beating was similar to the original pulp.At this time,the tensile index,burst index and ring crush index of high-yield corn stover pulp were increased by 30.8%,59.5%and 25.2%.