Page 31 - 1903完整版

第 40 卷第 3 期 Vol.40 No.3
涂层与防护
2019 年 3 月 Mar.2019
COATING AND PROTECTION

NPG 用量对 IPDI 预聚体水分散性和力学性能的

影响

李金燕，何强，梁军，孙彦璞 *
（宁夏大学化学化工学院能源化工重点实验室,化学国家级实验教学示范中心,银川 750021）

摘要：利用新戊二醇（NPG）甲基支链结构的特点,通过与二异氰酸酯（IPDI）反应，制得含-COOH、-NCO
封端、具有甲基侧链结构特点的预聚体。 在低聚物二元醇与 IPDI 投料比相同且不添加任何有机溶剂降黏
的情况下，研究了 NPG 含量对预聚体水分散性和力学性能的影响。 结果表明：随 NPG 含量的增加，预聚体
黏度不断降低、便于分散在水中。 当 NPG 含量≤2%时，即可实现预聚体水分散时无需添加有机溶剂降黏，
同时满足抗水性和力学性能的要求。
关键词：NPG；预聚体甲基侧链结构； 预聚体黏度；水分散性；力学性能
+
中图分类号：TQ630.7 2 文献标识码：A 文章编号：1672-2418(2019)03-0019-06
Effect& of& NPG+ Content+ on+ Water+ Dispersibility& and&

Mechanical&Properties&of&IPDI&Prepolymer

Li#jingyan##He+Qiang##Liang#Jun++Sun+Yanpu
(School of Chemistry and Chemical Engineering, Key Laboratory of Energy, National Demonstration
Center for Experimental Chemistry Education, Ningxia University, Yinchuan 750021,China)

Abstract:& Using the methyl branching structure characteristics of the neopentyl glycol (NPG),
methyl branching chain is introduced into the prepolymer by reacting neopentyl glycol (NPG) with
diisocyanate (IPDI) to obtain the polyurethane prepolymers having –COOH and –NCO end group
and methyl branched chain structure. Under the conditons of the same mass ratio of the oligomer
diol to IPDI and no additon of any organic solvent to reduce the viscosity, the effects of NPG
contents on the dispersibility and the mechanical properties of the prepolymer are studied. The
results show that the increase of NPG content causes the reduction of the viscosity of the prepoylmer
and is beneficial for the dispersibility of prepolymer in the water. When the NPG content is less than
2% , the prepolymer can be dispersed in the water without adding organic solvents to reduce
viscosity, at the same time, it can meet the demand on water resistance and the mechanical
properties.
Keywords：NPG; methyl -branched chains of prepolymers; viscosity and water dispersibility；
mechanical properties

基金项目：宁夏自然科学基金项目 NZ15053，宁夏高等学校一流学科建设（化学工程与技术学科）资助项目（NXYLXK2017A04）

分析测试 ANALYSIS AND TEST 19