CAJ | 학술논문

采用TEMPO/NaBr/NaC10体系将机械浆长纤维精基单元中的伯羟基选择性氧化成羧基来提高纸浆纤维羧基的含量.研究了TEMPO、NaBr和NaC10的用量以及浆浓对纸浆纤维氧化的影响,同时研究了羧基含量对机械浆长纤维性能的影响.结果表明,在氧化过程中,随着TEMPO和NaBr用量的增加,反应速度提高,而氧化后的纸浆纤维羧基含量没有增加,随着NaC10用量的增加,纸浆纤维的羧基含量上升.随着纸浆纤维浓度的增加.羧基含量先上升后下降,浆浓在1.3%时,羧基含量达到最高值.随着纸浆纤维羧基含景的增多,浆料抄片的抗张指数和耐破指数上升,撕裂指数下降,氧化的纸浆纤维对细小纤维的留着率下降;浆料的保水值上升而游离度下降;浆纤维的卷曲和扭曲系数降低.研究还发现,低羧基含量的纤维能够吸附部分有机溶解物以及其他物质,使得白水中的有机溶解物和总有机碳的含量下降,这种吸附性能随着羧基含量的增加而下降.
채용TEMPO/NaBr/NaC10체계장궤계장장섬유정기단원중적백간기선택성양화성최기래제고지장섬유최기적함량.연구료TEMPO、NaBr화NaC10적용량이급장농대지장섬유양화적영향,동시연구료최기함량대궤계장장섬유성능적영향.결과표명,재양화과정중,수착TEMPO화NaBr용량적증가,반응속도제고,이양화후적지장섬유최기함량몰유증가,수착NaC10용량적증가,지장섬유적최기함량상승.수착지장섬유농도적증가.최기함량선상승후하강,장농재1.3%시,최기함량체도최고치.수착지장섬유최기함경적증다,장료초편적항장지수화내파지수상승,시렬지수하강,양화적지장섬유대세소섬유적류착솔하강;장료적보수치상승이유리도하강;장섬유적권곡화뉴곡계수강저.연구환발현,저최기함량적섬유능구흡부부분유궤용해물이급기타물질,사득백수중적유궤용해물화총유궤탄적함량하강,저충흡부성능수착최기함량적증가이하강.
The selective oxidative conversion of C6 primary hydroxyl groups of TMP long fibers to carboxyl groups was carried out by a system of 2,2,6,6-teramethyl-l-piperidinyloxy (TEMPO)/NaBr/NaC10, and the effects of dosages of TEMPO, NaBr and NaC10 and the consisten- cy of pulp fibers on oxidative reaction were investigated, and the effect of carboxyl content on the characteristics of TMP long fibers was also studied. It was found that the reaction rate increased with increasing charges of TEMPO and NaBr, and the carbexyl group content of oxidized fibres did not increase, the carboxyl group content of oxidized fibres increased with increasing charge of NaC10; The carboxyl group content of oxidized fibres increased first and then dropped with increasing consistency of pulp fibres, and the maximum carbexyl content was attained when the consistency of pulp fibres was 1.3% ; The tensile index and burst index improved but the tear index and fines retention reduced with increasing carboxyl content on TMP long fibers; The water retention value increased and the pulp freeness decreased with increasing the carboxyl content; The curl index and the kink index decreased with increasing carboxyl content. It was also found that low carboxyl content on oxidized long fibers could adsorb part of the dissoluble substance (DS)and other substances, reducing the DS and total organic carbon (TOC)in whitewater; the adsorption capacity decreased with increasing carboxyl content.