Journal of South China University of Technology (Natural Science Edition) ›› 2010, Vol. 38 ›› Issue (4): 12-17.doi: 10.3969/j.issn.1000-565X.2010.04.003

• Chemistry & Chemical Engineering • Previous Articles     Next Articles

Ultrafiltration of Bamboo Pulp Black Liquor Modified by Graft Sulfonation and Water-Reducing Dispersion Performance of Fractions

Lou Hong-ming1.2  Zhang Hai-bin1  Liang Qiao1  Yang Dong-jie1.2  Qiu Xue-qing 1.2   

  1. 1.School of Chemistry and Chemical Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China;2.State Key Laboratory of Pulp and Paper Engineering,Guangzhou 510640,Guangdong,China
  • Received:2009-06-22 Revised:2009-08-28 Online:2010-04-25 Published:2010-04-25
  • Contact: 楼宏铭（1975-），男，副研究员，主要从事工业木质素的改性和应用研究． E-mail:cehmlou@scut．edu．cn
  • About author:楼宏铭（1975-），男，副研究员，主要从事工业木质素的改性和应用研究．
  • Supported by:

    广东省自然科学基金团队项目（8351064101000002）; 广东省教育部产学研结合项目（2007B090400088）; 广东省科技计划项目（2007A020100001-5）

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Abstract:

Bamboo pulp black liquor modified by graft sulfonation（GCL1-JB） was fractionated into four fractions with different relative molecular mass（RMM） by ultrafiltration,and the RMM distributions of GCL1-JB fractions were characterized by means of GPC.Then,the effects of GCL1-JB fractions on the performances of fresh cement paste and mortar were analyzed.The results show that（1） the fraction with high RMM is of better water-reducing dispersion performance;（2） when the dosage of the fraction with high RMM（more than 50000） is 0.5%,the fluidity of cement paste reaches 287mm at a water to cement ratio of 0.29,the fluidity loss ratio reaches 7% after 120min,and the 3-day,7-day and 28-day compressive strength ratios of mortar are respectively up to 159.4%,193.4% and 143.8%;（3） the fraction with moderate RMM is of strong air-entraining and retarding effect,which improves the workability of fresh mortar,although the long-term compressive strength of hardened mortar is relative low;and（4） when the dosage of the fraction with moderate RMM（10000～50000） is 0.5%,the initial setting time and final setting time of cement paste prolong for 140 and 297min,respectively,and the 28-day compressive strength ratio of hardened mortar is up to 99.8%.

Key words: bamboo pulp black liquor, super-plasticizer, ultrafiltration, water-reducing performance, dispersion performance