聚天冬氨酸/O-羧甲基壳聚糖的合成及其对硫酸钡阻垢性能

以水溶性O-羧甲基壳聚糖(O-CMC)与聚琥珀酰亚胺(PSI)为原料,合成了聚天冬氨酸接枝共聚物阻垢剂PASP/O-CMC。用FTIR与1HNMR对阻垢剂的结构进行了表征,用静态阻垢法考察了PASP/O-CMC和聚天冬氨酸(PASP)的阻垢性能。结果表明:当阻垢剂质量浓度为100 mg/L、温度为80℃、时间为16 h、pH=10时,PASP/O-CMC对BaSO_4的阻垢率达到93.6%,而PASP对BaSO_4的阻垢率只有78.4%。通过SEM、XRD和电导率法分析了阻垢剂的阻垢机理,结果表明:阻垢剂对BaSO_4的作用主要包括晶格畸变作用、吸附分散作用和络合作用。

Synthesis of Polyaspartic Acid/O-carboxymethyl Chitosan Graft Copolymer and Its Scale Inhibition Performance for Barium Sulfate

Polyaspartic acid/ O-carboxymethyl chitosan graft copolymer (denoted as PASP/O-CMC) was synthesized via the reaction of water soluble O-carboxymethyl chitosan (O-CMC) and polysuccinimide (PSI).The obtained graft copolymer (PASP/O-CMC) was characterized by FTIR and 1H NMR. The static scale inhibition method was used to evaluate the scale inhibition behavior of PASP/O-CMC and PASP against barium sulfate. The experimental results showed that PASP/O-CMC possessed the best scale inhibition property against BaSO4. Inhibition efficiency of PASP/O-CMC reached 93.6%, but that of PASP was only 78.4% when the dosage was 100 mg/L in the experiment. The scale inhibition mechanism of the scale inhibitor against BaSO4 was analyzed by means of environmental scanning electron microscopy (SEM), X-ray diffraction (XRD), and electrical conductivity measurement techniques. And it was found that the scale inhibition was mainly caused by lattice distortion of BaSO4, adsorption dispersion and complexation of the scale inhibitor and Ba2+.