木质素基超塑化剂的制备及其在砂浆中的应用

林产化学与工业 ›› 2009, Vol. 29 ›› Issue (6): 29-37.

木质素基超塑化剂的制备及其在砂浆中的应用

魏民, 易聪华, 邓永红, 杨东杰, 邱学青

华南理工大学化学与化工学院制浆造纸工程国家重点实验室, 广东广州 510640

收稿日期:2009-01-13 修回日期:1900-01-01 出版日期:2009-12-30 发布日期:2009-12-30
通讯作者: 邱学青,博士生导师,研究领域:木质素资源化高效利用的改性技术;E-mail:cexqqiu@scut.edu.cn。

Preparation of Lignin-based Superplasticizer and Its Application in Mortar

WEI Min WEI Min, YI Cong-hua, DENG Yong-hong, YANG Dong-jie, QIU Xue-qing

State Key Lab of Pulp & Paper Engineering, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China

Received:2009-01-13 Revised:1900-01-01 Online:2009-12-30 Published:2009-12-30

摘要/Abstract

摘要： 来源于木材、麦草、竹子和蔗渣的木质素磺酸钠与三聚氰胺、甲醛和焦亚硫酸钠合成出磺化木质素三聚氰胺甲醛超塑化剂(LSMF)。系统研究了LSMF对砂浆减水率、抗压强度、抗折强度和加速碳化深度等应用性能的影响。结果表明,使用麦草基木质素磺酸钠合成出磺化度 3.663 mmol/g,特性黏度 7.24 mL/g 的LSMF对砂浆的减水增强性能最好。当LSMF掺量为 0.7% 时,砂浆减水率为 21.1%。硬化砂浆 28 d 加速碳化深度为 13 mm,空白砂浆为 34.5 mm。掺加LSMF后,硬化砂浆 28 d 抗压强度和抗折强度分别比空白砂浆提高 37% 和 18%。LSMF超塑化剂为木质素高效利用提供了一种新的思路。

关键词: 木质素磺酸盐, LSMF, 超塑化剂, 耐久性

Abstract: Lignosulfonate-modified sulfonated melamine formaldehyde resin (LSMF) has been synthesized as a superplasticizer used in mortar, and its effects on the performance of mortar have been systematically investigated. To obtain a new superplasticizer LSMF, lignosulfonates originated from wood, straw, bamboo and bagasse were selected to react with sulfonated melamine formaldehyde through a four-step reaction. The effects of LSMF on the performances of the superplasticized mortar were studied through measuring water-reducing ratio, compressive strength, flexural strength, and accelerated carbonation depth. The result shows that straw-based LSMF with sulfonic group content of 3.663 mmol/g and intrinsic viscosity of 7.24 mL/g has the best water-reducing and reinforcement effects. When LSMF is used in dosage of 0.7% by weight of cement, water-reducing ratio reaches 21.1%. Compared with that of the control mortar, compressive strength and flexural strength of the superplasticized mortar increase 37% and 18% at 28 d, respectively. The minimum carbonation depth of superplasticized mortar at 28 d is 13 mm, while that of the control mortar is 34.5 mm. This understanding can lead to push forward the utilization of lignin with high efficiency.

Key words: lignosulfonate, LSMF, superplasticizer, durability

中图分类号:

魏民;易聪华;邓永红;杨东杰;邱学青. 木质素基超塑化剂的制备及其在砂浆中的应用[J]. 林产化学与工业, 2009, 29(6): 29-37.

WEI Min WEI Min;YI Cong-hua;DENG Yong-hong;YANG Dong-jie;QIU Xue-qing. Preparation of Lignin-based Superplasticizer and Its Application in Mortar[J]. , 2009, 29(6): 29-37.

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