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Improvement of tribocharging electrostatic powder coating systems

摩擦起电静电粉末喷涂系统的改进

基本信息

批准号：
15560620
负责人：
TAKEUCHI Manabu
金额：
$ 2.18万
依托单位：
Ibaraki University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560620/
关键词：
electrostatic powder coating tribocharging tribocharging spray gun charge control agent coating powder barium oxide molybdenum oxide triboelectric series イオン化ポテンシアル

项目摘要

Electrostatic powder coating is one of the promising technologies for pollution-free coatings. The electrostatic powder coating has two major types, corona charging and tribocharging. The surface smoothness is not sufficient in the corona charging type electrostatic powder coating. On the other hand, the tribocharging electrostatic powder coating produces smooth coating layers, but available coating powders are limited by the triboelectric series. The research project aimed to clear the limitation for coating powders by using charge control agents for both the tribocharging spray gun and the coating powders.First, a positive type charge control agent or a negative type charge control agent was incorporated into Nylon and polyethylene tubes, which were used for coating powder charging instead of a spray gun, and the change in charging ability was examined. A barium oxide powder or molybdenum oxide powder were also incorporated into the both tubes, that are more heat resistive than the c … More harge control agents. The concentration of the charge control agents and metal oxide powders were changed from 0 to 5 wt%.The ionization potentials of the both tubes were changed associated with incorporation of the charge control agents or metal oxide powders, which modified the charging characteristics of polymers. However, some of the tubes incorporated with the charge control agents or metal oxide powders did not show sufficient change in charging characteristics. This result can be attributable to the fact that some incorporated powders existed in the bulk of the tube, not at the surface. Tribocharging characteristics of coating powders made of acrylic, epoxy, polyester polymers with the modified tubes were investigated by using a suction type Faraday cage. The tribocharge Q/M of the coating powders depended on the type of polymers somewhat. Some coating powders tribocharged to a high level, 1 to 2 μC/g, while, other powders tribocharged at low level, about 0.5 μC/g.Next, the charge control agents were incorporated into the coating powders, and the tribocharging characteristics were examined. It is concluded that the charging characteristics can be controlled by using charge control agents into the coating powders, however, the trap depth of the coating powders does not change by the charge control agents. Less

粉末静电涂装是一种很有前途的无污染涂装技术。静电粉末涂料有两种主要类型，电晕充电和摩擦充电。在电晕充电型静电粉末涂料中，表面光滑度不够。另一方面，摩擦带电静电粉末涂料产生光滑的涂层，但可用的涂料粉末受到摩擦带电系列的限制。为了解决摩擦带电喷枪和包覆粉末均使用电荷控制剂的包覆粉末的局限性，本研究首先在代替喷枪进行包覆粉末带电的尼龙管和聚乙烯管中分别加入正电荷控制剂和负电荷控制剂，考察带电能力的变化。两种管中还加入了氧化钡粉末或氧化钼粉末，它们的耐热性比碳管高。 ...更多信息电荷控制剂。电荷控制剂和金属氧化物粉末的浓度在0 ~ 5wt%范围内变化，电荷控制剂或金属氧化物粉末的加入改变了两种管的电离电位，从而改变了聚合物的荷电特性。然而，掺入电荷控制剂或金属氧化物粉末的一些管在充电特性上没有显示出足够的变化。这一结果可归因于这样的事实，即一些掺入的粉末存在于管的本体中，而不是在表面处。用吸附式法拉第笼研究了丙烯酸、环氧、聚酯等聚合物涂层粉末与改性管的摩擦荷电特性。涂层粉末的摩擦电荷Q/M与聚合物的种类有关。一些涂层粉末摩擦带电量较高，为1 ~ 2 μC/g，而另一些粉末摩擦带电量较低，约为0.5 μC/g。结果表明，在包覆粉中加入电荷控制剂可以控制包覆粉的荷电特性，但电荷控制剂不会改变包覆粉的陷阱深度。少