Synthesis and Performance Evaluation of Zwitterionic Polycarboxylate Dispersant for Cementing Slurry
Due to technical and environmental issues,the production and use of existing polycondensa-tion dispersants are constrained.Polycarboxylate(PCE)superplasticizers are green and environmental-ly friendly,and have excellent dispersion performance.Although PCE is widely utilized in the concrete field,it causes a significant retarding effect when applied in cementing field.In this work,convention-al anionic polycarboxylate(CPC)and zwitterionic polycarboxylate(DPC)dispersants were synthesized by using isobutenol polyethylene glycol ether,acrylic acid and methacryloyloxyethyl trimethyl ammoni-um chloride as raw materials.Their structures were characterized,and their effects and mechanisms on the fluidity,rheological properties,thickening time and compressive strength of cement slurry were studied.The results indicate that both CPC and DPC have good dispersing properties,but DPC is much better than CPC in terms of thickening time and compressive strength.CPC has a strong retarding effect,which leads to a significant increase in thickening time and a decrease in the early strength of the cement stone.The introduction of quaternary ammonium cation synthesised DPC has a weak retar-ding effect,which has little effect on the thickening time and is conducive to the improvement of the early strength of the cement stone.
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