林产化学与工业2013，Vol.33Issue(1)：85-90,6.DOI:10.3969/j.issn.0253-2417.2013.01.016
造纸黑液磺化改性及改性产物性能研究
Sulphonation of Black Liquor and Properties of the Modified Product
摘要
Abstract
The lignin in black liquor was firstly extracted first and then sulphonated in present study. The optimum sulphonation conditions were determined by staged orthogonal design (hydroxymethylation first, then sulphonation). The sulphonated lignin (SL) was prepared. The product was characterized by FT-IR. Its sulphonation degree, paste fluidity, and weight-average molecular weight were measured respectively. After 4 g acid precipitated lignin in 40 g water reacted with 5 g formaldehyde at 75 ℃ for 2 h under the pH 11 environment, the pH of the system was adjusted to 7 and then 2 g sodium sulphite was added and reacted for another 4 h at 140 ℃. The optimal sulfonated lignin was obtained. FT-IR spectra showed that considerable sulphonic groups were introduced onto sulphonated lignin. The sulphonation degree and molecular weight of sulphonated lignin are 0.821 mmol/g and 22.97 ku, respectively. It was better than that of commercially available sodium lignosulphonate (SLS). This indicated that the paste fluidity of sulphonated lignin was also greater at water-cement ratio of 0.35 and identical dosage.关键词
造纸黑液/磺化/正交试验/重均分子质量Key words
black liquor/sulphonation/orthogonal design/weight-average molecular weight分类
化学化工引用本文复制引用
季栋,马宏明,何明,史以俊,罗振扬..造纸黑液磺化改性及改性产物性能研究[J].林产化学与工业,2013,33(1):85-90,6.基金项目
国家自然科学基金资助项目(50903043,51005123) （50903043,51005123）
江苏省生物质能源与材料重点实验室项目(201001) （201001）
