Liu Wei, Fu Jing, Zhang Haiping, Shao Yuanyuan, Zhang Hui, Zhu Jesse
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China.
Department of Chemical and Biochemical Engineering, Western University, London, KY N6A 5B9, Canada.
Materials (Basel). 2018 Oct 25;11(11):2086. doi: 10.3390/ma11112086.
An efficient and simple method for preparing bonded metallic powder coating is in high demand in the paint manufacturing and application industries. The bonding purpose is to keep the mass percentage of metallic pigment consistent between the original and recycled coating powder, which aims at solving the problem of recyclability. One possible method capable of realizing this goal is using the binder to cohere metallic pigment with base particles through a cold bonding method. Through this approach, the pre-curing and high-reject-rate problems generally present in thermal bonding can be completely eliminated. In this paper, polyacrylic acid (PAA) and polyvinyl alcohol (PVA) are applied as binders for the bonding process. At various dosages of liquid binder and D.I. water, bonded samples with different bonding effect were prepared. Finally, a good bonding quality with the lowest variance between the mass concentrations of Al flakes in the original powder (before spray) and deposited powder (after spray) 2.94% with PAA as a binder and 0.46% with PVA as a binder was achieved. These results manifest that the cold bonding method is a green and simple approach for preparing the metallic powder coating.
在涂料制造和应用行业中，对一种高效且简单的制备粘结金属粉末涂料的方法有很高的需求。粘结的目的是使原始涂料粉末和回收涂料粉末之间的金属颜料质量百分比保持一致，旨在解决可回收性问题。一种能够实现这一目标的可能方法是使用粘合剂通过冷粘结法将金属颜料与基础颗粒粘结在一起。通过这种方法，热粘结中通常存在的预固化和高废品率问题可以完全消除。在本文中，聚丙烯酸（PAA）和聚乙烯醇（PVA）被用作粘结过程的粘合剂。在不同剂量的液体粘合剂和去离子水的情况下，制备了具有不同粘结效果的粘结样品。最后，以PAA为粘合剂时，原始粉末（喷涂前）和沉积粉末（喷涂后）中铝片质量浓度之间的差异最小，为2.94%；以PVA为粘合剂时，差异最小为0.46%，实现了良好的粘结质量。这些结果表明，冷粘结法是一种制备金属粉末涂料的绿色且简单的方法。
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