CAJ | 학술논문

钙离子对实现造纸白水封闭循环有关键性的制约作用。通过对天然海藻酸钠进行改性来制备高羧基含量的化学助剂用于造纸湿部,可以起到控制钙离子影响的效果。通过测定2,2,6,6-四甲基哌啶-1-氧自由基（TEMPO）改性海藻酸钠羧基含量和螯合值,分析研究了NaClO用量、pH值和温度对反应过程的影响。选取氧化后羧基含量为2.14%、3.61%和未氧化（1.96%）的三组海藻酸钠添加到造纸湿部中进行应用实验,结果表明在一定的添加量下海藻酸钠能提高纸料的留着、滤水性能,并同时提高纸张强度。海藻酸钠加入量0.02%时最佳,并且羧基含量为3.61%的改性海藻酸钠作用效果最好。
개리자대실현조지백수봉폐순배유관건성적제약작용。통과대천연해조산납진행개성래제비고최기함량적화학조제용우조지습부,가이기도공제개리자영향적효과。통과측정2,2,6,6-사갑기고정-1-양자유기（TEMPO）개성해조산납최기함량화오합치,분석연구료NaClO용량、pH치화온도대반응과정적영향。선취양화후최기함량위2.14%、3.61%화미양화（1.96%）적삼조해조산납첨가도조지습부중진행응용실험,결과표명재일정적첨가량하해조산납능제고지료적류착、려수성능,병동시제고지장강도。해조산납가입량0.02%시최가,병차최기함량위3.61%적개성해조산납작용효과최호。
Calcium ions play an important role in achieving closing white water circuit.Higher carboxyl content sodium alginate modified by 2,2,6,6-tetramethyl piperidine-1-oxyl radical（TEMPO） oxidation which could be used in wet-end was able to control the compact of calcium ions.Through the determination of carboxyl contents and chelate values of sodium alginate modified by TEMPO oxidation,the affect from dosage of NaClO,pH value and temperature to the oxidation process was researched.Three kinds of sodium alginate which contained different amounts of carboxyl groups（2.14%,3.61% and 1.96%） were selected for further use on wet-end of papermaking through capturing calcium ions.Results showed that both modified and unmodified sodium alginate could improve drainage/retention abilities of pulp and strength of paper sheets.Meanwhile,the most appropriate amount of sodium alginate was 0.02% and the sodium alginate which contained 3.61% of carboxyl group had the best affection among the three kind of sodium alginate.