华南理工大学学报(自然科学版) ›› 2010, Vol. 38 ›› Issue (4): 12-17.doi: 10.3969/j.issn.1000-565X.2010.04.003

• 化学化工 • 上一篇    下一篇

竹浆黑液接枝磺化产物的超滤分级及减水分散性能研究

楼宏铭1,2  张海彬1  梁悄1  杨东杰1,2  邱学青1,2   

  1. 1.华南理工大学 化学与化工学院, 广东 广州 510640; 2.华南理工大学 制浆造纸工程国家重点实验室, 广东 广州 510640
  • 收稿日期:2009-06-22 修回日期:2009-08-28 出版日期:2010-04-25 发布日期:2010-04-25
  • 通信作者: 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
  • 作者简介: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.
  • 基金资助:

    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)

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)

摘要: 采用超滤将竹浆黑液接枝磺化产物(GCL1-JB)分成4个不同分子量范围的级分,采用凝胶渗透色谱进行分子量表征,研究了不同分子量级分对水泥净浆和砂浆性能的影响。结果表明,高分子量级分对水泥净浆和砂浆的减水分散性能优于低分子量级分,高分子量级分(大于50 000)在掺量0.5%时,水灰比为0.29的水泥净浆流动度为287 mm,120 min经时流动度损失为7%,3 天、7 天和28 天砂浆抗压强度比分别为159.4%,193.4%,143.8%。中等分子量级分具有很强的引气性和缓凝作用,可改善新拌砂浆的工作性,但是硬化砂浆后期的抗压强度低于空白砂浆。中分子量级分(10 000~50 000)在掺量0.5%时,水泥净浆初凝时间延长140 min,终凝时间延长297 min,28天砂浆抗压强度比为99.8%。

关键词: 竹浆黑液, 高效减水剂, 超滤, 减水性能, 分散性能

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