玉米秸秆化机浆的制备及其配抄性能的研究

Study on Preparation of Corn Stalk Chemi-mechanical Pulp and Its Papermaking Properties

本课题以玉米秸秆为原料,以KOH预浸渍和磨浆制备玉米秸秆化学机械浆(化机浆),探讨了预浸渍废液的理化性质,研究了不同打浆转数下,玉米秸秆化机浆与慈竹半化学浆配抄比例对手抄片物理性能的影响、二者配抄时的协同效应及制备瓦楞原纸的可行性。结果表明,玉米秸秆化机浆预浸渍废液可制备有机肥和复混肥料;与慈竹半化学浆相比,玉米秸秆化机浆具有较高的松厚度,较低的抗张指数、耐破指数和环压指数。在玉米秸秆化机浆中配抄一定比例的慈竹半化学浆有助于提高手抄片强度指标,但对松厚度有负面影响。当混合浆中玉米秸秆化机浆配抄比例为50%时,纤维间的结合强度存在一定协同效应,混合浆手抄片抗张指数的实际值略高于其抗张指数的加权贡献值。在玉米秸秆化机浆(游离度<380 mL)中配抄20%慈竹半化学浆,所得手抄片各项指标均能达到瓦楞芯(原)纸规定的合格品技术指标。

Corn stalk was pretreated with potassium hydroxide and refined to prepare chemi mechanical pulp.The physicochemical properties of the preimpregnation effluent,the physical properties of handsheets made by varying the ratio of corn stalk chemimechanical pulp and Sinocalamus affinis semi-chemical pulp,their synergistic effect and feasibility of preparing corrugated base paper at different beating revolution were discussed.The results showed that the preimpregnation effluent of corn stalk chemi-mechanical pulp could be used as organic and compound fertilizers.Compared with Sinocalamus affinis semi-chemical pulp,corn stalk chemi-mechanical pulp had higher bulk,lower tensile index,burst index,and ring crush index.Adding the Sinocalamus affinis semi-chemical pulp into the corn stalk chemi-mechanical pulp could improve the strength index of the handsheet,and reduce the handsheet bulk.When the proportion of corn stalk chemi-mechanical pulp in the mixed pulp was less than 50%,the synergistic effect affects the bonding strength between fibers,and the tested tensile index of the mixed pulp was slightly higher than the calculated value.When the proportion of Sinocalamus affinis semi-chemical pulp was 20% in the mixed pulp with the freeness of corn stalk chemi-mechanical pulp was less than 380 mL,the technical index of this as-prepared handsheet could reach the required standard of the qualified corrugated medium.