自乳化法合成阳离子型水性聚氨酯工艺条件探讨

以聚乙二醇（PEG）、甲苯二异氰酸酯（TDI）、N-甲基二乙醇胺（MDEA）为主要原料，用自乳化法合成了阳离子型水性聚氨酯；探讨了合成反应工艺条件，研究表明较佳的合成工艺条件为：制备预聚物时n（NCO）／n（OH）比值为3：1；以N-甲基二乙醇胺为扩链剂，采用“饥饿加料”方式，其用量为预聚物质量的5．0％～6．0％；预聚物合成反应温度为60℃，反应时间3h；扩链反应的反应温度40℃，反应时间5h；中和度为80％～100％。在此工艺条件下，合成的阳离子型水性聚氨酯具有良好的稳定性能。

Study on Process Conditions of Synthesis of Cationic Waterborne Polyurethane by Self-emulsified Method

The cationic waterborne polyurethane were synthesized by means of the method of selfemulsion process, using polyethylene glycol, toluene diisocyanate and N-methyldiethanolamine as main reaction materials. The reaction process conditions for synthesizing waterborne polyurethane were discussed. The results show that optimum conditions of the reactions are as follows： The ratio of nNCO/ nOH is 3：1 for preparing prepolymer, N-methyldiethanolamine is as hydrophilic extender and its adding amount is 5.0%-6.0% of the prepolymer mass,the adding method for N-methyldiethanol amine is under starvation, the reaction temperature for preparing prepolymer is about at 60℃ and reaction time for 3hours, the reaction temperature for chain extending is at 40℃ and reaction time for 5hours, and the neutralization degree is between 80% and 100%. The obtained cationic waterborne polyurethane has good storage stability under above narrated process conditions.