长链烷基脲类消泡剂的合成及性能研究  

Synthesis and Properties of Long Chain Alkyl Urea Defoamers

作　　者：焦彦君 汪昌国 曹添 陈小强[1] JIAO Yanjun;WANG Changguo;CAO Tian;CHEN Xiaoqiang(Nanjing Tech University,Nanjing 211816,China;Jiangsu Sixin Technology Application Research Institute Company Limited,Nanjing 210028,China)

机构地区：[1]南京工业大学,江苏南京211816 [2]江苏四新科技应用研究所股份有限公司,江苏南京210028

出　　处：《化学反应工程与工艺》2024年第1期49-57,共9页Chemical Reaction Engineering and Technology

基　　金：国家自然科学基金面上项目(21978131)。

摘　　要：开发无硅型消泡剂是未来消泡剂领域的发展方向之一。本工作将十八烷基异氰酸酯分别与油胺、1,6-己二胺和三(2-氨基乙基)胺反应合成了三种长链烷基脲,并以烷基脲为消泡活性物、矿物油为载体、Span-Tween为乳化剂制备了三种脲类消泡剂。用核磁共振氢谱(1H NMR)和红外光谱(FT-IR)对产物进行结构表征。通过显微观察手段研究了疏水粒子在油基消泡剂中的消泡过程和机理,并通过单因素实验探究了各组成及用量对消泡剂性能的影响。结果表明:当选用低黏度白油,脲消泡活性物占消泡剂质量分数为4%,Span-Tween复合乳化剂亲水亲油平衡(HLB)值为8、用量占消泡剂质量分数为5%时,制得的脲类消泡剂在涂料应用中有着比同类市售产品更优异的消泡性能。Developing silicon-free defoamer is one of the development directions in the field of defoaming agent in the future.In this work,three long-chain alkyl ureas were prepared via the reaction of 1-isocyanatooctadecane with oleylamine,1,6-hexanediamine and tris(2-aminoethyl)amine,respectively,and three urea defoamers were formulated with alkyl urea as active substance,mineral oil as carrier,and Span-Tween as emulsifier.The structure of the products was characterized by nuclear magnetic resonance spectroscopy(1H NMR)and Fourier transform infrared spectroscopy(FT-IR).The defoaming process and mechanism of hydrophobic particles in oil-based defoamers were studied by microscopic method.Through single factor experiments,the influences of each composition and dosage on the performance of defoamer were explored.The results indicate that when the low viscosity white oil was selected,and the urea active substance accounted for 4%of the defoamer mass fraction,the Span-Tween compound emulsifier has hydrophilic-lipophilic balance(HLB)value of 8 and the mass fraction of the defoamer is 5%,the urea defoamer had better defoaming performance than similar commercial products in coating application.

关 键 词：消泡剂 脲 消泡机理 消泡性能 涂料 

分 类 号：TQ630.49[化学工程—精细化工]