基于OCC的纤维素纳米纤丝制备及其对废纸造纸增强作用研究

OCC-based Cellulose Nanofibril and Its Reinforcing Effect on Recycled Papermaking

关键词:  OCC  高锰酸钾  纤维素纳米纤丝  废纸造纸  白水

Key Words:OCC  KMnO₄  cellulose nanofibril  recycled papermaking  white water

摘要:采用高锰酸钾氧化预处理废旧箱纸板（OCC），使其达到微纤维分离点，结合轻微的均质处理高效获得OCC基纤维素纳米纤丝（OCNF），得率约为70%。最优条件下制备的OCNF具有良好的纳米尺寸，长径比高达313，Zeta电位-21.0 mV，结晶度为69.23%，OCNF薄膜具有良好的力学性能（应力为44.16 MPa，应变为5.82%，弹性模量为2.55 MPa）及光学性能（透光率约为60%）。添加5% OCNF所抄纸张的抗张指数、撕裂指数及耐折度分别提升了27.74%、40.97%和228.57%。同时，白水的质量也得以大幅改善，浊度、悬浮物、COD_Cr分别降低了59.10%、48.08%和42.17%。

Abstract:Old corrugated container （OCC） was pretreated oxidation by potassium permanganate， reaching the microfiber separation point， then combined with a slight homogenization treatment. The OCC-based cellulose nanofiber （OCNF） was efficiently obtained with a yield of approximate 70%. The OCNF had good nanometer size with the aspect ratio of 313， the Zeta potential was -21.0 mV， and the crystallinity was 69.23%. The OCNF films had good mechanical properties（stress of 44.16 MPa， strain of 5.82%， and elastic modulus of 2.55 MPa） and optical properties （transmittance of approximate 60%）. The obtained 5% OCNF was applied to OCC papermaking， and the tensile index， tear resistance index， and folding endurance of recycled paper increased by 27.74%， 40.97%， and 228.57%， respectively. The quality of white water had also been greatly improved， and the turbidity， suspended solids， and COD_Cr had been reduced by 59.10%， 48.08%， and 42.17%， respectively.