Recently,cellulose nanofibril(CNF)has emerged as a promising,sustainable reinforcement with outstanding potential in material science.Owing to the properties of CNF,it has been explored in food,cosmetic,and pharmaceut...Recently,cellulose nanofibril(CNF)has emerged as a promising,sustainable reinforcement with outstanding potential in material science.Owing to the properties of CNF,it has been explored in food,cosmetic,and pharmaceutical applications,as well as in industrial applications such as paints,drill muds,packaging,and papermaking.The application of CNF in papermaking is expected to be implemented in the near future to broaden the commercial market of cellulose.Numerous studies and patents have reported on the manufacturing,properties,and applications of nanocellulose.This present paper focuses on the recent progresses in the application of CNF as a wet-end additive in papermaking.展开更多
Mechanical pulps are widely used in the production of newsprint, and resin is the main component of wood extractives in the pulp, which is harmful to both the wet-end and paper quality especially in newsprint paper mi...Mechanical pulps are widely used in the production of newsprint, and resin is the main component of wood extractives in the pulp, which is harmful to both the wet-end and paper quality especially in newsprint paper mill. In the case of mill whitewater closure, the problems become more noticeable. In this work, the CRC (colloid resin component) simulacrum was made by individually dispersing the oleic acid and glyceride with mechanical method, and the effects on wet-end chemical characteristics and newsprint physical proprieties were discussed. It was found that some of the wet-end characteristics such as cationic demand, Zeta potential, and first pass retention were remarkably affected by the CRC simulacrum. The first pass retention decreased from 75.7% to 69.2% in the presence of oleic glyceride and from 81.7% to 78.4% in the presence of oleic acid in PEO/PFR retention system and from 78.6% to 75.4% (with oleic glyceride) and 74.3%to 70.1%(with oleic acid) in PEI/CPAM retention system. The CRC simulacrum of oleic acid and glyceride remarkably decrease the tensile strength and tear strength of newsprint hand sheets. The scattering coefficient of the hand sheets increased with the concentration of simulacrum.展开更多
利用DOE(design of experiment)实验设计方法,研究了无机盐、纤维原料配比和pH对纸料动电位(zeta电位)的影响。结果表明:随着无机盐离子浓度的增加,系统zeta电位增加;与Ca2+、Na+相比,Al3+对纸料系统ze-ta电位的影响程度更为显著。随着...利用DOE(design of experiment)实验设计方法,研究了无机盐、纤维原料配比和pH对纸料动电位(zeta电位)的影响。结果表明:随着无机盐离子浓度的增加,系统zeta电位增加;与Ca2+、Na+相比,Al3+对纸料系统ze-ta电位的影响程度更为显著。随着纸料配比中阔叶浆用量增加,系统zeta电位降低;pH增加也使系统zeta电位降低。当系统zeta电位接近于零时纸料在网部的单程留着率达到最大值。展开更多
基金grateful for the financial support from the National Natural Science Foundation of China(Grant Nos.31770628 and 31901267)the Taishan Scholars Program+3 种基金the Provincial Key Research and Development Program of Shandong(Grant Nos.2019JZZY010326 and 2019JZZY010328)a projectu(Grant No.ZR2019BC042)supported by the Shandong Provincial Natural Science Foundationa project of the Shandong Province Higher Educational Science and Technology Program(J18KA111).
文摘Recently,cellulose nanofibril(CNF)has emerged as a promising,sustainable reinforcement with outstanding potential in material science.Owing to the properties of CNF,it has been explored in food,cosmetic,and pharmaceutical applications,as well as in industrial applications such as paints,drill muds,packaging,and papermaking.The application of CNF in papermaking is expected to be implemented in the near future to broaden the commercial market of cellulose.Numerous studies and patents have reported on the manufacturing,properties,and applications of nanocellulose.This present paper focuses on the recent progresses in the application of CNF as a wet-end additive in papermaking.
文摘Mechanical pulps are widely used in the production of newsprint, and resin is the main component of wood extractives in the pulp, which is harmful to both the wet-end and paper quality especially in newsprint paper mill. In the case of mill whitewater closure, the problems become more noticeable. In this work, the CRC (colloid resin component) simulacrum was made by individually dispersing the oleic acid and glyceride with mechanical method, and the effects on wet-end chemical characteristics and newsprint physical proprieties were discussed. It was found that some of the wet-end characteristics such as cationic demand, Zeta potential, and first pass retention were remarkably affected by the CRC simulacrum. The first pass retention decreased from 75.7% to 69.2% in the presence of oleic glyceride and from 81.7% to 78.4% in the presence of oleic acid in PEO/PFR retention system and from 78.6% to 75.4% (with oleic glyceride) and 74.3%to 70.1%(with oleic acid) in PEI/CPAM retention system. The CRC simulacrum of oleic acid and glyceride remarkably decrease the tensile strength and tear strength of newsprint hand sheets. The scattering coefficient of the hand sheets increased with the concentration of simulacrum.
文摘利用DOE(design of experiment)实验设计方法,研究了无机盐、纤维原料配比和pH对纸料动电位(zeta电位)的影响。结果表明:随着无机盐离子浓度的增加,系统zeta电位增加;与Ca2+、Na+相比,Al3+对纸料系统ze-ta电位的影响程度更为显著。随着纸料配比中阔叶浆用量增加,系统zeta电位降低;pH增加也使系统zeta电位降低。当系统zeta电位接近于零时纸料在网部的单程留着率达到最大值。
