水性 UV 树脂的研究进展

详细介绍了各类水性UV树脂的优缺点和合成方法,包括水性聚丙烯酸酯、水性聚酯丙烯酸酯、水性环氧丙烯酸酯、水性聚氨酯丙烯酸酯等。综述了水性UV树脂在超支化技术、有机/无机杂化体系、双重固化体系、环氧丙烯酸酯/聚氨酯丙烯酸酯复合体系等方面的研究进展,简要介绍了水性UV树脂的应用,并展望了其未来的发展方向。  

酸溶液在纳米蒙脱土改性EA光固化涂料中的渗透行为

采用静态浸泡法得到了漆膜增重-时间曲线,研究了酸溶液在纳米蒙脱土(nano-MMT)改性光固化涂层中的渗透行为.结果表明:浸泡初期,介质在涂层中的传输行为符合Fick扩散定律,之后涂层吸收量达到饱和,由计算公式可求得渗透介质在涂层中的扩散系数;添加nano-MMT、增加WEA:WAD的比例和提高交联密度可以减小渗透介质的扩散系数,提高涂层的抗介质渗透性能.  

水和氯离子在纳米蒙脱土改性光固化涂层中的传输行为

采用静态浸泡法绘制了漆膜增重-时间曲线,考察了纳米蒙脱土(nano-MMT)改性紫外光固化涂层的吸水性,分析了纳米蒙脱土用量、环氧丙烯酸酯(EA)与合成活性稀释剂(AD)比例、光固化涂层的固化程度与介质传输行为的关系。结果表明:在浸泡初期,NaCl溶液在涂层中的传输行为符合Fick扩散定律,之后涂层吸水量达到饱和,由计算公式可求得渗透介质在涂层中的扩散系数。同时,涂层的固化程度越高、WEA:WAD越大,涂层的抗介质渗透性能越好。  

Corrosion protection properties of new UV curable waterborne urethane acrylic coatings

Abstract

Looking to the development of sustainable and low impact chemical technologies, water based paints offer significant advantage especially for in field applications, where the problem of solvent emission is really stringent. Some water based coatings are represented by alkyd and epoxy paints, capable of cross-linking either by auto-oxidation or with polyamines. Polyurethane aqueous dispersions are finding wide acceptance due to their better durability, adhesion and mechanical properties. The research presented here describes the design, application and characterisation of well defined model structures of waterborne UV curing coatings. The waterborne resins used in this work are segmented anionomeric polyurethanes functionalised with acrylic end groups: they were prepared from polytetramethylene glycol, isophorone diisocyanate, dimethylol propionic acid, and hydroxyethylacrylate. The preliminary results concerning the corrosion protection properties of the new UV curable waterborne coatings applied onto metallic substrates are very promising and were obtained by using electrochemical techniques. Water uptake is the critical process determining the corrosion performance. In particular the necessity to formulate the coating starting from higher molecular weight polytetramethylene glycol for good barrier properties is evident from the electrochemical impedance spectroscopy data.  

纳米蒙脱土填充紫外光固化涂层的介质传输行为

采用静态浸泡法绘制了漆膜增重-时间曲线，研究了纳米蒙脱土(nanoMMT)填充紫外光固化涂层的吸水性及纳米蒙脱土用量、环氧丙烯酸酯(EA)与合成活性稀释剂(RD)比例、光固化涂层的固化程度与介质传输行为的关系.结果表明，WEA∶WRD越大、涂层的固化程度越高，涂层的抗介质渗透性能越好.添加纳米蒙脱土能促进涂层中酯键的水解，对涂层的耐介质传输性能不利.