含聚乙二醇长侧链的无磷阻垢剂合成与阻磷酸钙性能

采用过硫酸铵为引发剂,丙烯酸(AA)和烯丙基聚乙二醇硫酸铵(AS10,10是聚乙二醇聚合度)为单体制备了一种用于阻磷酸钙垢的无磷阻垢剂AA/AS10,并利用红外光谱对其结构进行了表征。通过单因素法确定了合成反应的最佳工艺:单体AS10与AA的质量比为2∶1,引发剂用量为反应物单体总质量的3%、反应温度为80℃、聚合时间为1.5 h。同时考察了阻垢剂AA/AS10用量对共聚物阻磷酸钙垢性能的影响。结果表明,阻垢剂AA/AS10用量存在临界值效应,在临界值6 mg/L时,阻磷酸钙垢率约92%。扫描电镜研究表明,阻垢剂AA/AS10减小了磷酸钙固体颗粒的尺寸从而使其分散在水中而不沉积。

Synthesis of a non-phosphorus antiscalant containing poly(ethylene glycol) long-side chains and its performance on inhibition of calcium phosphate

Acrylic acid(AA)/ammonium allylpoly(ethylene glycol) sulfate(AS10,10 is the degree of polymerization of polyethylene glycol) copolymers,as non-phosphorus antiscalants for calcium-phosphate precipitation,were synthesized by using AA and AS10 as monomers and ammonium persulfate as initiator.The copolymer of AA/AS10 was characterized by means of FTIR.Through a single factor test,the optimal synthetic conditions were ascertained as follows:mass ration of AS10 to AA was 2∶1,dose of initiator accounted for 3% of the total monomer mass,reaction temperature was 80 ℃,and polymerization time was 1.5 h.The influence of dose of AA/AS10 on calcium-phosphate inhibition was also investigated.It was found that there was a threshold dose of AA/AS10 antiscalant and approximately 92% of calcium-phosphate inhibition ratio was reached when the dose of AA/AS10 was 6 mg·L-1.Scanning electron microscope(SEM) images show that the application of AA/AS10 inhibitor significantly reduced the size of calcium-phosphate solids,thereby making them disperse in water without any precipitation.