富羟基聚天冬氨酸接枝共聚物合成及阻垢研究

Synthesis of Hydroxy-rich Polyaspartic Acid Grafted Copolymer and Its for Scale Inhibition

通过固相热缩聚法,在无溶剂和催化剂的条件下,以L-天冬氨酸为反应单体制备出聚琥珀酰亚胺(PSI);然后以PSI和三羟甲基氨基甲烷(THAM)为反应单体,通过在碱性条件下开环接枝反应,成功制备出THAM、THAM接枝共聚物(PASP-THAM)。通过傅里叶变换红外光谱分析对其结构进行了表征,并采用静态沉积法对其阻垢性能进行了测试。结果表明,在PASP-THAM的质量浓度分别为6、8 mg/L时,其对CaCO3和CaSO4垢阻垢率分别达到85.3%和100.0%;在人工模拟浓缩海水条件下的阻垢实验,阻垢率亦可达到99.5%。通过扫描电镜和拉曼光谱分析对所得沉积垢进行了表征,确认PASP-THAM对于沉积垢晶格有破坏作用,可以降低其稳定性。

Polysuccinimide(PSI) was prepared with polyaspartic acid(PASP) as the reactive monomer through solid phase thermal polycondensation without solvent and catalyst, then PSI and 1,1,1-tris(hydroxymethyl)methylamine(THAM) as the the reactive monomers to synthesize polyaspartic acid/1,1,1-tris(hydroxymethyl) methylamine graft copolymer(PASP/THAM) through open-ring grafting reaction under alkaline condition. The synthesized polymer was characterized by Fourier-transform infrared spectroscopy(FT-IR), and its scale inhibition performance was evaluated by a static scale-inhibition method. The results showed that PASP/THAM possessed good scale inhibition property against CaCO3, CaSO4, and Ca3(PO4)2. The scale inhibition efficiency of PASP/THAM was 85.3% and 100.0% against CaCO3 and CaSO4 when the added mass concentration was 6 mg/L and 8 mg/L respectively. Under the artificial concentrated seawater test conditions, the scale inhibition efficiency was close to 99.5%. The results of scanning electron microscopy and Raman spectroscopy indicated that, PASP-THAM had destructive effect on the scale crystals, which could reduce the stability of the scale crystals.