耐盐降失水剂AMPS/DMAA/IA的合成及其性能评价

Synthesis and Performance Evaluation of Salt-Resistant Fluid Loss Additive AMPS/DMAA/IA

针对目前降失水剂黏度大、易增稠、抗盐能力差等问题,以2-丙烯酰胺基-2甲基丙磺酸(AMPS)、N,N-二甲基丙烯酰胺(DMAA)、衣康酸(IA)为聚合单体,采用水溶液自由基聚合方法合成了适用于海水水泥浆体系的降失水剂AMPS/DMAA/IA。通过红外光谱分析,各单体成功参与聚合反应,经热重分析,三元共聚物AMPS/DMAA/IA耐温可达320℃。经水泥浆性能测试表明,该降失水剂具有优良的降失水性能,抗盐可达饱和;在海水水泥浆体系稠化曲线平稳,无"鼓包"、"包芯"现象;低温下,随着加量增加,对水泥石抗压强度影响较小,无超缓凝现象,在海水水泥浆中具有良好的综合性能。

Fluid loss additives （FLAs） have the feature of high viscosity, thus increasing the consistence of cement slurry. Moreover, some FLAs exhibit poor salt-tolerant ability. Aimed at above problems, a new fluid loss additive （FLA） AMPS/DMAA/IA was synthesized through free radical aqueous solution copolymerization with the monomers of 2-acrylamido-2-methyl-propane sulphonic acid （ AMPS）, N, N- dimethyl-acrylamide （DMAA） and itaconic acid. The structure of the copolymer was identified by FTIR analysis. The thermogravimetry analysis showed that the terpolymer was stable when temperature was below 320 ℃. The polymer exhibits excellent fluid loss control ability and can be available in saturated brine. The undesired phenomenon such as ＂abnormal gel＂ or ＂false set＂ was not observed in the thick- ening test. What＇ s more, the dosage of the terpolymer exerts little effect on the compressive strength of cement stone at low temperature. The far delayed solidification was not presented. It is established that the terpolymer AMPS/DMAA/IA possesses good integrated performance in sea-water cement slurry system.