Nanocrystalline cellulose from aspen kraft pulp and its application in deinked pulp
Qinghua Xu1, Yang Gao, Menghua Qin
1Key Laboratory of Paper Science & Technology of Ministry of Education, Shandong Polytechnic University, University Park of Science and Technology, Jinan 250353, China.
Abstract:
Nanocrystalline cellulose (NCC) isolated from bleached aspen kraft pulp was characterized, and its application as pulp strengthening additive and retention aid was investigated. Results showed that NCC with high crystallinity of more than 80% can be obtained using 64 wt% sulfuric acid. The structure of nanocrystalline cellulose is parallelepiped rod-like, and their cross-sectional dimension is in the nanometer range with a high aspect ratio. The formation of microparticle retention systems during the application of NCC together with cationic polyacrylamide and cationic starch in deinked pulp was able to further improve pulp retention and strength properties without negative influence on the drainage.
