冷邦定法制备金属粉末涂料

Preparation of metallic powder coating by cold bonding method

提出了一种常温下金属粉末涂料冷邦定的方法.该法首先由聚乙烯醇(PVA)胶水包裹金属铝粉制备带胶铝粉,而后通过流化床湿空气法处理带胶铝粉和粉末涂料底粉,实现二者在室温下的邦定.通过实验对流化床湿空气法中相关影响因素:流化气体相对湿度、流化时间和流化气体流量进行了考察,得出在该装置上当流化气体为饱和湿空气,流化时间为10 min,流化气体流量为0.5 L·min^-1时,邦定效果最佳.与未邦定的金属粉末涂料相比,沉积到测试板上的样品与初始样品中金属铝粉含量差值大大减小,说明金属铝粉和底粉邦定成功,制备的金属粉末涂料达到工业使用要求.

A cold bonding method for preparation of metallic powder coatings at room temperature was proposed.In this method,metal aluminum flakes were firstly coated with polyvinyl alcohol(PVA) glue and then treated in the wet-air fluidized bed with coating powders to achieve their bonding.The influencing factors of wet-air fluidization method,e.g.the relative humidity and flow rate of fluidized gas,fluidization time were investigated.Within the scope of testing range,the optimal bonding effect was achieved when the fluidized gas was saturated wet air,the fluidization time was 10 min and the flow rate of the gas was 0.5 L·min^-1.Compared with the unbonded metallic powder coating,the difference of the aluminum content between the sample deposited on the test panel and the original sample was significantly reduced,which indicates that the aluminum flakes and the powder coatings were successfully bonded,and the prepared metallic powder coatings meet the industrial requirements.