高分散性丁苯胶乳的制备及其对水泥的改性

doi:10.16085/j.issn.1000-6613.2021-0251

摘要/Abstract

摘要：

添加传统丁苯胶乳进行改性，大大提高了水泥的力学性能，但是改性后的水泥材料流动性能差，抗压性能损失较多。为了提高添加丁苯胶乳后水泥的流动性及降低抗压性能损失，本文对丁苯胶乳进行改性，以苯乙烯与聚丁二烯作为核层、带有苯环的对苯乙烯磺酸钠作为壳层，制备出核壳型丁苯（SSBR）胶乳。把新合成的SSBR胶乳加入水泥后，对水泥力学性能进行表征，由于SSBR胶乳中与磺酸根相连的是苯环刚性链，空间位阻效应明显，添加8% SSBR胶乳水泥浆的流变指数增大为0.898，分子链强度大，水泥石的7天抗压强度损失量为2.31%，损失不明显，同时抗折强度提高17%。对SSBR胶乳改性水泥石材料力学性能的作用机理进行探究，结果表明，SSBR胶乳填充作用明显，吸附作用较强，增大水泥浆流动性能，且胶乳粒子可以与Ca²⁺络合，形成三维网状空间立体结构，从而达到增强水泥石力学性能强度，提高水泥石韧性的目的。

关键词: 乳液, 水泥, 流变学, 吸附作用

Abstract:

Adding traditional styrene butadiene latex can greatly improve mechanical properties of the cement. However, the modified cement material has poor fluidity and loss of compressive performance. In order to improve the fluidity of the cement after adding styrene butadiene latex and reduce the loss of compressive performance, the styrene-butadiene latex was modified, styrene and polybutadiene were used as the core layer, and sodium p-styrene sulfonate with benzene ring as the shell layer to prepare the SSBR latex. After adding newly synthesized SSBR latex to the cement , the mechanical properties of the cement were characterized. Since the benzene ring rigid chain is connected to the sulfonate in the SSBR latex, the steric hindrance effect is obvious, and the fluidity index of the cement slurry with 8% SSBR latex increased to 0.898. The molecular chain strength was large, the 7-day compressive strength loss of cement stone was 2.31%, at the same time, the flexural strength was increased by 17%. The mechanism of the mechanical properties of SSBR latex modified cement-based materials was explored. The results showed that SSBR latex has obvious filling effect, strong adsorption effect, and increases the fluidity of cement slurry, and it can complex with Ca²⁺ to form a three-dimensional network structure, increase the strength of the mechanical properties of the cement stone, improve the toughness, so as to achieve the purpose of enhancing the mechanical properties of the cement stone.

Key words: emulsions, cement, rheology, adsorption

中图分类号:

O632.13

封江辉, 胡苗苗, 赵佳琪, 熊祥宇, 郭锦棠. 高分散性丁苯胶乳的制备及其对水泥的改性[J]. 化工进展, 2022, 41(1): 359-364.

FENG Jianghui, HU Miaomiao, ZHAO Jiaqi, XIONG Xiangyu, GUO Jintang. Preparation of highly dispersible SSBR latex and modification of cement[J]. Chemical Industry and Engineering Progress, 2022, 41(1): 359-364.

图/表 11

图1 SSBR胶乳结构式

图2 SSBR胶乳的红外吸收谱图

图3 SSBR胶乳透射电镜照片

表1 水泥浆沉降稳定性测试

水泥浆类型

上层水泥浆密度ρ₁/g·cm^-3

下层水泥浆密度ρ₂/g·cm^-3

密度差

(ρ₂-ρ₁)/g·cm^-3

图4 水泥浆的流变指数与比例系数

图5 水泥石抗折力学性能强度

图6 水泥石抗压力学性能强度

图7 水泥石的应力-应变曲线

图8 纯水泥石和SSBR胶乳水泥石的孔径分布曲线

图9 不同加量SSBR胶乳的吸附量

图10 不同加量盐SSBR胶乳的zeta电位

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