Preparation and Performance Evaluation of a Solid Anti-channeling Toughening Agent
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摘要: 针对丁苯胶乳在实际使用过程中存放稳定性差、加量大、现场配制劳动强度高等问题，通过引入对苯乙烯磺酸钠、衣康酸，提高耐温抗盐性和亲水性，合成了可再分散性能优异的SISBR固体胶乳粉末，研究不同衣康酸加量对胶乳性能的影响。通过红外光谱、Zeta电位、透射电子显微镜、紫外可见吸收光谱对胶乳粉进行了表征，评价了其抗温抗盐性。实验表明，改性后的羧化丁苯胶乳粒子分散均匀，稳定性好，可分散性能优异。磺酸基团和羧基的引入，提高了分子的刚性，衣康酸加量为3%时，耐温达260℃以上，且抗盐性能优异。胶乳粉能够均匀分散在水泥中，可明显改善水泥浆的流变性能，且具有良好的成膜性和填充效果。加入2.4%SISBR-3胶乳粉，水泥石的力学性能改善最为明显，改性后的水泥浆表现出优异的弹韧性和防窜性能。Abstract: Styrene butadiene latex used in oil well cement has several shortcomings such as poor storage stability, high concentration required and high labor intensity in cement slurry mixing, etc. To deal with these problems, a solid powdered re-dispersible latex SISBR has been synthesized by introducing sodium p-styrenesulfonate and itaconic acid into the styrene butadiene latex to improve its high temperature stability, salt resistance and hydrophilicity. The effects of the amount of the itaconic acid on the properties of the latex were studied. The latex powders were characterized with IR spectroscopy, Zeta potential measurement, transmission electron microscope and ultraviolet-visible light absorption spectrum, and the high temperature stability and salt resistance of the latex SISBR were evaluated. Laboratory experimental results show that the modified carboxylated styrenesulfonate latex powders can be evenly dispersed in water and have good high temperature stability and excellent dispersibility. The introduction of the sulfonic acid groups and carboxyl groups increases the rigidity of the latex molecules. At an itaconic acid concentration of 3%, SISBR stays stable at 260 °C or higher and has excellent salt resistance. SISBR powders can evenly disperse in a cement slurry and can significantly improve the rheology of the cement slurry. SISBR also has good filming property and filling effect. A set cement containing 2.4% SISBR-3 latex powders can have its mechanical property most remarkably improved, and the cement slurry modified with the SISBR-3 has excellent elasticity, toughness and anti-channeling property.
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表 1 不同IA加量下合成的SISBR粉末的耐盐性能
胶乳 饱和NaCl溶液 饱和MgCl2溶液 饱和CaCl2溶液 SISBR-1 稳定 稳定 黏度增大，无絮凝 SISBR-3 稳定 稳定 黏度增大，无絮凝 SISBR-5 稳定 稳定 黏度增大，无絮凝 
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