含聚乙二醇长侧链的无磷阻垢剂合成与阻磷酸钙性能

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

摘要:

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。

Abstract:

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 of AA and AS10 monomers and ammonium persulfate initiator. The copolymer of AA/AS10 was characterized by FT-IR. Through single factor test, the optimal synthetic conditions were obtained 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 shown there is a threshold dose and approximately 92% calcium-phosphate inhibition when the dose of AA/AS10 is 6 mg•L-1. Scanning electron microscope (SEM) images showed the application of AA/AS10 inhibitor significantly decreased the size of calcium-phosphate solids thereby dispersing through water.