Page 184 - 精细化工2019年第12期

第 36 卷第 12 期 精 细 化 工 Vol.36, No.12
2019 年 12 月 FINE CHEMICALS Dec. 2019

建筑用化学品
木质素改性聚羧酸减水剂研究（Ⅰ）

——合成、表征与性能

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邱 峰 ，范 雷
（1. 辽宁石油化工大学 化学化工与环境学部，辽宁 抚顺 113001；2. 辽宁奥克化学股份有限公司，辽宁
辽阳 111003）

摘要：以碱木质素和不饱和聚氧乙烯醚为原料，制得木质素改性聚氧乙烯醚单体（KL-TPEG），并以 KL-TPEG
为原料制得了一系列木质素含量不同的木质素基聚羧酸减水剂 PCE-Ls。对 PCE-Ls 进行了结构表征，并以分散
性、流变性及对混凝土抗压强度测试了 PCE-Ls 与普通聚羧酸减水剂（PCE-B）的性能差异。结果表明，PCE-Ls
具有较好的表面活性和引气性能，5 min 泡沫高度>50 mm，远高于 PCE-B 的 20 mm。KL-TPEG 质量浓度为 50 g/L
时，表面张力仅为 36.01 mN/m。与传统聚羧酸减水剂 PCE-B 相比在分散性上差异不大，而 PCE-Ls 的初始流动
度均高于 300 mm；PCE-Ls 分散的混凝土坍落度均在 110 mm 以上，具有较好的和易性。拟合模型表明，PCE-Ls
分散的水泥浆体具有更低的屈服应力、更好的稳定性和更低的塑性黏度。
关键词：聚羧酸减水剂；改性聚氧乙烯醚单体；木质素；分散性；流动度；流变模型；建筑用化学品
中图分类号：TQ630 文献标识码：A 文章编号：1003-5214 (2019) 12-2512-09

Lignin Modified Polycarboxylic Superplasticizer (Ⅰ)-Synthesis,

Characterization and Properties

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QIU Feng , FAN Lei
（1. Department of Chemistry, Chemical Engineering and Environment, Liaoning Shihua University, Fushun 113001,
Liaoning, China; 2. Liaoning Oxiranchem. Group Co., Ltd., Liaoyang 111003, Liaoning, China）

Abstract: Lignin-modified polyoxyethylene ether monomer (KL-TPEG) was prepared from lignin and
unsaturated polyoxyethylene ether. Then, a series of lignin-based polycarboxylic acid water reducers
PCE-Ls with different lignin content were prepared from KL-TPEG. The structure of PCE-Ls was
characterized. The property difference between PCE-Ls and traditional polycarboxylic water reducer
PCE-B were tested by dispersibility, rheology and compressive strength of concrete. The results showed
that PCE-Ls had good surface activity and air entraining properties, its 5 min foam height was greater than
50 mm, much higher than that of PCE-B 20 mm. The surface tension was only 36.01 mN/m when the mass
concentration was 50 g/L. Compared with PCE-B, the dispersion of PCE-Ls was not much different, but the
initial fluidity of PCE-Ls was all higher than 300 mm. The slump of PCE-Ls dispersed concrete was more
than 110 mm, which had better and easier performance. The fitting model revealed that PCE-Ls dispersed
cement paste had lower yield stress, better stability and lower plastic viscosity.
Key words: polycarboxylate water reducer; modified polyether monomer; lignin; dispersion; fluidity;
rheological model; building chemicals

聚羧酸减水剂是一类以聚羧酸为主链、聚氧烷 酸减水剂的分子结构具有可修饰性 [2-7] ，很多研究者
基醚为侧链的聚合物，其具有低掺量、高保坍性、 对聚羧酸减水剂或对聚羧酸单体进行了结构修饰与
高分散性、绿色环保等特点，已取代萘系、脂肪族 改性，以形成功能性减水剂实现对不同水泥的适应
[1]
减水剂，成为减水剂市场的主流产品 。由于聚羧 性、对泥土或硫酸根离子的抗性等 [8-11] 。

收稿日期：2018-12-15; 定用日期：2019-08-02; DOI: 10.13550/j.jxhg.20180920
作者简介：邱 峰（1967—），女，硕士，高级实验师，E-mail：zhl6650370@163.com。