缓释型萘系减水剂的合成

· 1103 ·第36卷第7期

缓释型萘系减水剂的合成

王素娟1，严云1,2，胡志华1,2

(1. 西南科技大学材料科学与工程学院；2. 先进建筑材料四川省重点实验室，四川绵阳 621010)

摘要：用尿素法制备了镁铝层状双金属氢氧化物(MgAl–layered double hydroxide–like host materials，MgAl–LDHs)，采用焙烧复原法将商品萘系减水剂插入MgAl–LDHs的层间，得到了一种缓释型萘系高效减水剂。采用热重–同步差热分析、X射线衍射和红外光谱分别对MgAl–LDHs、焙烧后的镁铝层状双金属氧化物(magnesium aluminum layered double oxide，MgAl–LDO)和用萘系减水剂插层MgAl–LDHs的产物等的结构进行了表征，分析了不同焙烧温度对插层组装效果的影响，并测试了掺此种减水剂的水泥净浆流动度的经时变化。结果表明：在500℃焙烧得到的MgAl–LDO，其层状结构可以恢复。萘系减水剂插层后，MgAl–LDHs的X射线衍射特征峰向小角度移动，层间距由原来的0.76nm增大到1.03nm；红外光谱在1035.6cm–1和1123.1cm–1处出现了萘系减水剂中SO3–基团的吸收峰，且MgAl–LDHs中NO3–基团的吸收峰明显减弱。与基准相比，此减水剂具有明显的减小水泥净浆流动度经时损失的效果。

关键词：层状双金属氢氧化物；萘系减水剂；插层；水泥净浆；流动度

中图分类号：TU528 文献标志码：A 文章编号：0454–5648(2009)07–1103–07

SYNTHESIS OF CONTROLLED RELEASE NAPHTHALENE-BASED SUPERPLASTICIZER

W ANG Sujuan1，YAN Yun1,2，HU Zhihua1,2

(1. Department of Material Science and Engineering, Southwest University of Science and Technology; 2. Key Laboratory for

Advanced Building Materials of Sichuan Province, Mianyang 621010, Sichuan, China)

Abstract: A novel controlled-release naphthalene-based superplasticizer with features of lower flowability loss of cement pastes was synthesized by intercalating naphthalene-based superplasticizer molecules into the galleries of layered double hydroxide–like host materials (MgAl–LDHs) by calcine-recovering method, which was prepared by co-precipitation techniques (urea method). The re-sulting materials were characterized by X-ray diffraction, Fourier transform infrared spectroscopy and thermogravim-etry–synchronization differential thermal analysis. The effect of calcining temperature on the intercalation efficiency of naphtha-lene-based superplasticizer molecules was investigated, and then the flowability of cement paste blended with superplasticizer varying with time was analyzed. The results indicate that the magnesium aluminum layered double oxide (MgAl–LDO) which was obtained by calcining MgAl–LDHs at 500 can be recovered. The primary

℃XRD peak of MgAl–LDHs intercalated by naphthalene-based superplasticizer molecule shifts towards a low angle value and the interlayer spaces expand from 0.76 to 1.03nm, which can be at-tributed to the insertion of organic naphthalene-based superplasticizer molecules into the interlayer space of the host materials. The FTIR spectroscopy of controlled release naphthalene-based superplasticizer shows the new absorption peaks at 1035.6 and 1123.1 cm–1, in which indicates the presence of SO3– within the galleries of the host materials, and the absorption peak of nitrate anions weakened obviously. Compared to the control mix, the controlled release naphthalene-based superplasticizer molecules have a promi-nent effect on reducing the loss of flowability of cement pastes.

Key words: layered double hydroxides; naphthalene-based superplasticizer; intercalation; cement paste; flowability

随着混凝土的生产和应用技术迅速发展，混凝土的用量急剧增加，使用范围日益扩大。目前，混凝土已成为最主要的工程材料之一，现代混凝土减水剂技术的发展是现代混凝土技术发展的关键，混凝土减水剂技术的创新与发展一直是混凝土外加剂行业发展的重点与热点。目前国内合成高效减水剂

收稿日期：2008–08–25。修改稿收到日期：2008–10–28。基金项目：国家科技攻关计划(2006BAF02A24)资助项目。

第一作者：王素娟(1983—)，女，硕士研究生。

通讯作者：严云(1961—)，男，博士，教授。Received date:2008–08–25. Approved date: 2008–10–28.

First author: WANG Sujuan (1983–), female, graduate student for master degree.

E-mail: wangsujuan0724@

Correspondent author: YAN Yun (1961–), male, Ph. D., professor.

E-mail: yanyun@

第37卷第7期2009年7月

硅酸盐学报

JOURNAL OF THE CHINESE CERAMIC SOCIETY

Vol. 37，No. 7

J u l y，2009