高等学校化学学报

高等学校化学学报

• 研究论文 • 上一篇    

淤浆法碱化试剂选择对PAC分子结构及其泥浆滤失性能影响

王飞俊1, 邵自强1, 王文俊1, 吕少一1, 冯增国1, 廖兵2   

    1. 北京理工大学材料科学与工程学院, 北京 100081;
    2. 中国科学院纤维素化学重点实验室, 广州 510650
  • 收稿日期:2008-02-18 修回日期:1900-01-01 出版日期:2008-11-10 发布日期:2008-11-10
  • 通讯作者: 邵自强

Effect of Alkali Agents on Molecular Structure of PAC and Drilling-mud Fluid Loss

WANG Fei-Jun1, SHAO Zi-Qiang1*, WANG Wen-Jun1, LÜ Shao-Yi1, FENG Zeng-Guo1, LIAO Bing2   

    1. School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China;
    2. Key Laboratory of Cellulose and Lignocellalosics Chemistry, Chinese Academy of Sciences, Guangzhou 510650, China
  • Received:2008-02-18 Revised:1900-01-01 Online:2008-11-10 Published:2008-11-10
  • Contact: SHAO Zi-Qiang

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被引次数

5

摘要： 采用XRD和显微镜分析技术研究了高浴比淤浆法制备聚阴离子纤维素过程中, NaOH、KOH及其混合碱化体系对纤维素润胀度及结晶度的影响, 借助1H NMR方法分析了产物的取代度及取代基在葡萄糖环基C2、C3和C6位分布的均匀性. 通过泥浆实验研究了产品在高电解质含量中的高温滤失性能. 结果表明, 在相同摩尔浓度条件下, 棉纤维润胀度变化规律是: NaOH/KOH(摩尔比, 9∶1)>NaOH>NaOH/KOH(摩尔比, 1∶1)>NaOH/KOH(摩尔比, 1∶9)>KOH, 结晶度的顺序相反. 1H NMR测试结果表明, 含少量的K+时, 羧甲基在葡萄糖单元环内分布更均匀, 产品具有优良的耐酸、耐盐性和抗高温滤失性能; 当体系KOH成为主要碱化试剂时, 在酸碱介质中出现分层, 抗滤失性能急剧变差.

关键词: 聚阴离子纤维素, 碱化试剂, 润胀度, 取代基分布, 抗滤失性能

Abstract: During the polyanionic cellulose(PAC) manufacturing in slurry process, the influence of alkali agent on the structure and characterization of PAC was studied by producing PAC with NaOH, KOH and mixture thereof. The cellulose fibre swelling ratio in different alkali systems decreases in the order as follows: NaOH/KOH(molar ratio 9/1), NaOH, NaOH/KOH(molar ratio 1/1), NaOH/KOH(molar ratio 1/9), KOH. Crystalline grade of cellulose is in the reverse order. These results were obtained by means of X-ray diffraction and microscope. The degree of substitution of PAC and substituent distribution within anhydroglucose unit(AGU) were determined by means of 1H NMR spectrum. The results show that the degree of substitution of PAC is higher and the distribution of the substituents in the anhydroglucose unit of PAC is more even in the presence of a little KOH. These made PAC have an excellent viscosity stability in salt and lactic acid and fluid loss resistance. When KOH was a major alkali agent, solubility of PAC in salt and lactic acid became worse and fluid loss increased.

Key words: Polyanionic cellulose, Alkali agent, Swelling ratio, Substituent distribution, Fluid loss resistance property

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