L-赖氨酸改性聚天冬氨酸的阻垢缓蚀性能与生物降解性  

Scale/corrosion inhibition and biodegradation of lysine modified polyaspartic acid

作　　者：柳鑫华 周坤[2] 韩婕[3] 陈智慧 李慧娟 LIU Xinhua;ZHOU Kun;HAN Jie;CHEN Zhihui;LI Huijuan(Department of Chemistry, Tangshan Normal University, Tangshan 063000, Hebei, China;Hebei Chemical ＆ Pharmaceutical College, Shijiazhuang 050026, Hebei, China;Tangshan Environmental Monitoring Center, Tangshan 063000, Hebei, China;College of Information Engineering, North China University of Science and Technology, Tangshan 063000, Hebei, China)

机构地区：[1]唐山师范学院化学系,河北唐山063000 [2]河北化工医药职业技术学院,河北石家庄050026 [3]唐山市环境监测中心站,河北唐山063000 [4]华北理工大学信息工程学院,河北唐山063000

出　　处：《化工学报》2018年第5期2127-2136,共10页CIESC Journal

基　　金：河北省钢铁联合自然基金项目(B2017209228);唐山师范学院博士基金项目(2018A04)~~

摘　　要：L-赖氨酸经过氨解反应合成一种改性聚天冬氨酸衍生物(Lys-PASP),用FTIR红外谱图证明了Lys-PASP分子中同时含有羧基和酰胺基等基团。扫描电子显微镜(SEM)的分析结果可知:Lys-PASP的加入使溶液中CaCO_3和CaSO_4的钙垢晶体的生长过程和形态发生变化,使得钙垢疏松、细小,抑制了它们长成致密结构的钙垢,从而达到很好的阻垢效果;Lys-PASP的加入使钙垢晶型变化,减缓了试片表面点蚀的发生;另外通过化学和物理的吸附作用在试片表面形成一层吸附膜而达到较好的缓蚀效果。探讨了Lys-PASP接枝聚合物对CaCO_3和CaSO_4垢的阻垢能力与Lys-PASP的投加量、Ca^(2+)的浓度和测试体系的温度之间的密切联系。当Lys-PASP的投加量为10 mg·L^(-1)时,对CaCO_3的阻垢率为98.7%,对CaSO_4阻垢率接近于100%,而在温度达到80℃、Ca^(2+)分别达到500 mg·L^(-1)和7000 mg·L^(-1)的浓度时,Lys-PASP也表现出很好的阻垢效果。另外,用失重法研究了当Lys-PASP和PASP均为150 mg·L^(-1)时,Lys-PASP的缓蚀率比PASP高13%;用摇床实验法证明了Lys-PASP属于易生物降解的物质。A poly-aspartic acid derivative（Lys-PASP） was synthesized by ammonia reaction of L-lysine. FTIR characterization of the polymer demonstrated that Lys-PASP contained carboxyl and amide groups. SEM study indicated that adding Lys-PASP changed growth process and morphology of CaCO3 and CaSO4 crystals such that loose and fine calcium scale could be formed, which prevented developing dense-structured calcium scale and achieved a good scale inhibition. The addition of Lys-PASP also caused lattice distortion of calcium scale crystals and inhibited surface pitting corrosion. Besides, a layer of adsorption film on surface by chemical and physical adsorption assisted to achieve a better corrosion inhibition effect. The scale inhibition efficiency of Lys-PASP graft copolymer to CaCO3 and CaSO4 was closely related to Lys-PASP dosage, Ca^2＋ concentration and system temperature. At 10 mg·L^-1 Lys-PASP, the CaCO3 scale inhibition efficiency was 98.7% and that of CaSO4 was close to 100%. Lys-PASP exhibited good scale inhibition at temperature 80℃and Ca^2＋ concentration at 500 mg·L^-1 and 7000 mg·L^-1. Furthermore, gravimetric study showed that corrosion inhibition efficiency of Lys-PASP is 13% higher than that of PASP when both Lys-PASP and PASP were 150 mg·L^-1. Lys-PASP polymer is easily biodegradable per oscillating incubator study.

关 键 词：聚合物 阻垢性能 缓蚀性能 降解 吸附作用 

分 类 号：TQ085.4[化学工程]