Method for improving the fiber strength of waste paper with low lignin content by using cellulase/amino acid modification and paper prepared by the method

• Main Authors: WAN JINQUAN, WANG JINRAN, MA YONGWEN, WANG YAN
• Format: Patent
• Language: Chinese; English
• Published: 30.08.2019
• Subjects: IMPREGNATING OR COATING OF PAPER; PAPER NOT OTHERWISE PROVIDED FOR; PAPER-MAKING; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; PRODUCTION OF CELLULOSE; PULP COMPOSITIONS; TEXTILES; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G

The invention discloses a method for improving the fiber strength of waste paper with low lignin content by using cellulase/amino acid modification and the paper prepared by the method. The method comprises the following steps: pulping waste paper to obtain pulp, adding cellulase and amino acid into the pulp, adjusting the pH value to 5-8 and reacting at 40-60 DEG C for 40-70 min; after the reaction is completed, washing the filtrate with water until colorless, and then pulping and performing papermaking. As that cellulase is used for treating the fiber, the fiber becomes soft and plastic, andthen pulping can significantly improve the fine fiber of the fiber, increase the binding force between the fiber, the amino group in the amino acid is combined with the hydroxyl group on the cellulose by the hydrogen bonding force, the amino acid is grafted onto the cellulose chain, so that the carboxyl group content in the slurry is increased, and the swelling ability of the fiber is increased.Compared with the unmodifi