含荧光基团的丙烯酸-丙烯酰胺共聚物的合成

以4-氯-1,8-萘二甲酸酐和3-二甲氨基丙胺为原料合成了一种水溶性的荧光单体4-甲氧基-N-(2-N,′N′-二甲基氨基丙基)萘二甲酰亚胺烯丙基氯化铵(4-MNDMAPN-AQ),并得到了最佳的合成条件。通过红外光谱、核磁共振谱、质谱等方法对产物结构进行了表征。将该荧光单体与丙烯酸(AA)、丙烯酰胺(AM)共聚,得到了共聚物AA/AM/4-MNDMAPN-AQ。对该共聚物的荧光性质和阻垢性能进行了系统研究,结果表明,该共聚物的荧光强度与其质量浓度呈良好的线性关系,线性相关系数为0.995 0,检测下限为0.48m g/L。采用硬垢法,在(75±0.2)℃、Ca2+]=5mm ol/L、HCO3-]=10mm ol/L、恒温10h、共聚物AA/AM/4-MNDMAPN-AQ的质量浓度为2.5m g/L的条件下,该共聚物的阻垢率可达70.78%,与阻垢性能良好的2-膦酸基丁烷-1,2,4-三羧酸相当,达到了阻垢剂的阻垢分散性能要求,表明该共聚物具有良好的阻垢性能。

Synthesis of Acrylic Acid-Acrylamide Copolymer Containing Fluorescent Group

A novel water soluble fluorescent monomer,4-methoxy-N-(3-dimethylaminopropyl)naphthalimide allyl chloride quaternary ammonium salt(4-MNDMAPN-AQ),was synthesized from 4-chloro-1,8-naphthalic anhydride and 3-dimethyl amino propylamine.The optimal reaction conditions were obtained,and structure of the product was characterized by means of IR,~1H NMR and MS.The copolymer AA/AM/4-MNDMAPN-AQ from acrylic acid(AA),acrylamide(AM)and 4-MNDMAPN-AQ was prepared.The fluorescent properties and scale inhibition performance of the copolymer were studied in detail.Relationship between fluorescent intensity and concentration of copolymer was linear in concentration range of 1— 8mg/L.The correlation coefficient(R)was(0.995 0.)Under optimal conditions:Ca~(2+)]=5mmol/L,HCO~-_3]=10mmol/L,t=(75±0.2)℃ for 10h and copolymer mass concentration 2.5mg/L,the scale inhibition rate could reach 70.78% by means of hard scale determination.Beside possessing fluorescence,the copolymer AA/AM/4-MNDMAPN-AQ,as a high performance scale inhibitor,was comparable with 2-phosphono-butane-1,2,4-tricarboxylic acid which was known as the best scale inhibitor.