低酸值磺化聚酯多元醇的合成与应用  

Synthesis and Application of Sulfonated Polyester Polyols with Low Acid Value

作　　者：李厦厦 牟静 王小君 吴林波[1,2] LI Shasha;MU Jing;WANG Xiaojun;WU Linbo(State Key Laboratory of Chemical Engineering,College of Chemical and Biological Engineering,Zhejiang University,Hangzhou 310058,China;Key Laboratory of Biomass Chemical Engineering of Ministry of Education,College of Chemical and Biological Engineering,Zhejiang University,Hangzhou 310058,China;Transfar Zhilian Co.,Ltd.,Hangzhou 311215,China)

机构地区：[1]浙江大学化学工程与生物工程学院化学工程联合国家重点实验室,浙江杭州310058 [2]浙江大学化学工程与生物工程学院生物质化工教育部重点实验室,浙江杭州310058 [3]传化智联股份有限公司,浙江杭州311215

出　　处：《新技术新工艺》2024年第3期23-30,共8页New Technology & New Process

摘　　要：磺化聚酯多元醇是合成软段亲水的磺酸型水性聚氨酯的关键原料。低酸值是磺化聚酯多元醇的重要技术指标,也是合成水性聚氨酯的关键。以间苯二甲酸二甲酯-5-磺酸钠为亲水单体,采用酯交换/酯化-熔融缩聚法合成了多种磺化聚酯多元醇,对产物结构进行了表征,重点考察了缩聚压力对其酸值的影响。根据二元醇在缩聚温度下的饱和蒸气压,提出“三段压力控制法”,逐级降低缩聚压力,在无溶剂的情况下使酸值降至1~2 mg KOH/g以下。由此开发的工艺适用于不同种类聚酯多元醇的合成,并可进行工艺放大。低酸值磺化聚己二酸丁二醇酯具有优异的亲水性和水分散性,可形成粒径<100 nm且带有蓝光的水分散液。将其应用于水性聚氨酯的合成,成功制得拉伸强度≥30 MPa的聚氨酯膜。Sulfonated polyester polyols were key raw materials in synthesis of sulfonate type waterborne polyurethane(WPU)with hydrophilic groups in soft segment.The low acid value(A v)was an important technical indicator of sulfonated polyester polyols as well as a key factor that affecting the synthesis of WPU.Several sulfonated polyester polyols were synthesized by transesterification/esterification-melt polycondensation method by using sodium dimethyl isophthalate-5-sulfonate as a hydrophilic monomer.The structure of the products was characterized and the influence of condensation pressure on A v was investigated with emphasis.According to the saturated pressure of diol at the polycondensation temperature,a so-called“three-stage pressure control method”was proposed and a variety of sulfonated polyester polyols with A v<1~2 mg KOH/g were synthesized by gradually reducing the pressure without the aid of solvent or water-carrying agent.The developed technology was suitable for the synthesis of different kinds of polyester polyols and could be scaled up.Low A v sulfonated poly(butanediol adipate)had excellent hydrophilicity and water dispersion,which could form water dispersions with blue light and particle size<100 nm,and polyurethane film with enough tensile strength(≥30 MPa)was successfully synthesized from it.

关 键 词：化学工艺 化工热力学 聚酯多元醇 间苯二甲酸二甲酯-5-磺酸钠 低酸值 水性聚氨酯 力学性能 

分 类 号：TQ024.1[化学工程] TQ323.8