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Development of Tribocharging Powder Coating System for Top-Coating of Automobile Bodies

汽车车身面漆摩擦起电粉末涂装系统的开发

基本信息

批准号：
10555241
负责人：
TAKEUCHI Manabu
金额：
$ 7.23万
依托单位：
IBARAKI UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

项目摘要

Powder coating is known as a technique, which is free from volatile organic compounds. Brushing-up of powder coating technique has been tried by using charge control agent(CCA), most of which are organic materials, to tribocharging powder coating to form coating layers with high quality with high transfer efficiency in this studyFirst, effects of CCA on tribocharging of coating powders was examined. For that purpose, CCA was incorporated into a polymer layer, and tribocharging characteristics of a ferrite powder with polymer coating by the polymer was measured by cascade method. The CCA free styrene-acrylic polymer sheet tribocharges the ferrite powder slightly negatively. When a positive CCA is incorporated into the polymer, the negative tribocharge of the ferrite powder increases, and a negative CCA shifis the tribocharging of the ferrile powder in the positve direction.Next, CCA was incorporated into a triobcharging power spray gun, and change in the tribocharging of coating powders was examined. It could be confirmed that the tribocharging of coating powders was controlled by CCA.However, most organic CCAs decompose easily at relatively low temperature, which limits practical application of CCA to powder spray gun, because spray guns are usually fabricated by modlding.If we use metal oxide powders instead of organic CCAs, we can clear the problem of decomposition of CCAs. Unfortunately, however, charge control power of metal oxides are weaker than usual organic CCAs.In conclusiron, application of CCA to powder coating improves the tribocharging of coating powders, bringing about improvement of coated layers.

粉末涂料是一种不含挥发性有机化合物的技术。本研究尝试将电荷控制剂（CCA）用于粉末涂料的摩擦荷电，以形成高质量、高转移效率的涂层。首先，研究了CCA对粉末涂料摩擦荷电的影响。为此，CCA被引入到聚合物层中，并且通过级联方法测量具有由聚合物包覆的聚合物的铁氧体粉末的摩擦充电特性。不含CCA的苯乙烯-丙烯酸聚合物片使铁氧体粉末摩擦带轻微的负电荷。将正CCA加入到聚合物中，铁氧体粉末的负摩擦荷电增加，负CCA使铁氧体粉末的摩擦荷电向正方向移动，然后将CCA加入到摩擦荷电粉末喷枪中，考察涂层粉末的摩擦荷电变化。但是，由于喷枪通常采用模压成型的方法，大多数有机CCA在较低温度下容易分解，限制了CCA在粉末喷枪中的实际应用，如果用金属氧化物粉末代替有机CCA，可以解决CCA分解的问题。但不幸的是，金属氧化物的电荷控制能力比通常的有机CCA弱。总之，CCA应用于粉末涂层可以改善涂层粉末的摩擦带电，从而改善涂层的性能。