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Research on the Depolymerization Control and Mechanism of Cellulose in the Regeneration Process of Waste Cotton Fiber
Received:July 10, 2023  
DOI：10.11980/j.issn.0254-508X.2023.11.007
Key Words:waste cotton  separation and recycling  cooking  reduction/depolymerization mechanism
Fund Project:国家重点研发计划 （2020YFC1910301）。
Author NameAffiliationPostcode
CHEN Luzheng* State Key Lab of Bio-based Materials and Green Papermaking， Qilu University of Technology（Shandong Academy of Sciences）， Ji’nan， Shandong Province， 250353 250353
ZONG Peipei State Key Lab of Bio-based Materials and Green Papermaking， Qilu University of Technology（Shandong Academy of Sciences）， Ji’nan， Shandong Province， 250353 250353
CUI Fengyun Shandong Shengquan New Materials Co.， Ltd.， Ji’nan， Shandong Province， 250200 250200
MENG Zhenzhen State Key Lab of Bio-based Materials and Green Papermaking， Qilu University of Technology（Shandong Academy of Sciences）， Ji’nan， Shandong Province， 250353 250353
LIU Keyin State Key Lab of Bio-based Materials and Green Papermaking， Qilu University of Technology（Shandong Academy of Sciences）， Ji’nan， Shandong Province， 250353 250353
JIANG Yifei State Key Lab of Bio-based Materials and Green Papermaking， Qilu University of Technology（Shandong Academy of Sciences）， Ji’nan， Shandong Province， 250353 250353
HAN Wenjia State Key Lab of Bio-based Materials and Green Papermaking， Qilu University of Technology（Shandong Academy of Sciences）， Ji’nan， Shandong Province， 250353 250353
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Abstract:In this study， given the problems in the depolymerization process of waste cotton， such as the uncontrollable polymerization degree， high impurity content， difficult separation， severe process pollution， low-value-added products and so on， a new system of cooking and bleaching was developed and a new way of clean spinning of waste cotton recycled pulp was explored. The interaction principles and regulatory mechanisms among the degradation/depolymerization products were comprehensively investigated， the reaction mechanism， transformation behavior and migration of reaction products of the main components in the depolymerization process were systematically explored. The results showed that increasing the cooking temperature， increasing the alkali concentration， extending the cooking time， and increasing the dosage of hydrogen peroxide could intensify the ring exfoliation of fibers and cellulose degradation， resulting in a decrease in the polymerization of the pulp. The cooking pretreatment could significantly inprove the crystallinity of waste cotton， reduce the bound water and non-cellulose impurities contained in the cotton pulp， and the removal of non-cellulose impurities from the cotton pulp could be realized.
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