聚氨酯增韧环氧富锌涂料的制备及性能研究

Preparation and Property Investigation of Epoxy Zinc-rich Coating Toughened by Polyurethane

目的增强环氧富锌涂层的韧性。方法利用末端带有环氧基的聚氨酯作为增韧剂，将其添加到环氧富锌涂料中，研究增韧剂的种类、添加量对富锌漆膜性能的影响，同时研究锌粉含量对漆膜性能的影响。结果增韧剂的添加提高了富锌漆膜的附着力、柔韧性和耐冲击性能，但使漆膜的耐水、耐盐雾性能稍微下降。结论当添加占树脂质量15％的聚氨酯时，含78％～85％锌粉（质量分数）的富锌涂层都能保持良好的力学性能。

Objective To improve the toughness of epoxy zinc-rich coatings. Methods Polyurethane toughening agent with ter- minal epoxy group was synthesized and added into the coating. The influence of the toughening agent with different types and con- tents on the properties of zinc-rich coating was investigated. The influence of the Zn content on the coating was also studied. Re- suits The results showed that the toughening agent improved the adhesion force, flexibility and shock resistance of the zinc-rich coating, however, the properties of water resistance and salt spray test were slightly decreased. Conclusion When the content of polyurethane was set at 15%, the coating exhibited the best properties. The coatings with contents of zinc and polyurethane of 78% 85% and 15% exhibited excellent mechanical properties.