| Effects of Mg-based Alkaline Peroxide Bleaching on Physical Properties of Poplar Bleached Chemi-thermomechanical Pulp and Its Influence Mechanism |
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| Author Name | Affiliation | | Wei Liu1,2 | 1. Tianjin Key Laboratory of Pulp & Paper, Tianjin University of Science & Technology, Tianjin, 300457, China
2. State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, Guangdong Province, 510640, China | | Song Han1,3 | 1. Tianjin Key Laboratory of Pulp & Paper, Tianjin University of Science & Technology, Tianjin, 300457, China
3. Lee & Man Paper Manufacturing Limited, Changshu, Jiangsu Province, 215536, China | | LiGuo Zhang1 | 1. Tianjin Key Laboratory of Pulp & Paper, Tianjin University of Science & Technology, Tianjin, 300457, China | | QingXi Hou1,* | 1. Tianjin Key Laboratory of Pulp & Paper, Tianjin University of Science & Technology, Tianjin, 300457, China |
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| Fund Project:This work was financially supported by the Natural Science Foundation of China (31070528), Project of China “Twelfth Five-Year” National Science and Technology Supporting Plan (2011BAC11B04), and the Foundation of State Key Laboratory of Pulp and Paper Engineering. |
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| Abstract:In this study, MgO was partially used as an alkali source in the peroxide bleaching process of bleached chemi-thermomechanical pulp (BCTMP). The effects of substitution percentage of MgO for NaOH on the bulk, optical, and physical properties of bleached pulp, and the main effluent characteristics were analyzed. In addition, the influencing mechanism of Mg-based alkali on the strength properties of the BCTMP was further investigated. Strength properties of the BCTMPs were investigated as a function of charge characteristics, fiber morphology, surface lignin content, relative bonding area, and hydrogen bonds of the BCTMP. The results showed that cationic demand (CD) and chemical oxygen demand (CODCr) of the bleaching effluent decreased as the substitution percentage of MgO for NaOH increased; meanwhile, the bulk and optical properties of the BCTMP increased. Nevertheless, the strength properties (tensile, tear, and burst indices) of the bleached pulp decreased as the substitution percentage of MgO for NaOH increased. The decrease in the fiber charge density and increase in the surface lignin content affected the fiber swelling, resulting in a decline in pulp inter-fibers bonding strength and further loss of the tensile and burst indices. |
| keywords:Mg-based alkali substitution chemi-thermomechanical pulp alkaline peroxide bleaching physical properties |
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