静电粉末喷涂及应用

<正> 静电喷涂是传统的喷涂和静电效应相结合的一项新技术,它具有良好的表面涂层质量,防止环境污染,生产效率高,综合经济效益好等特点,因此得到了广泛的应用并获得迅速的发展,静电喷涂包括静电喷涂和静电粉末喷涂(或称静电喷粉、静电喷塑)。本文将介绍静电粉末喷涂原理及工艺流程,粉末涂料品种,以及静电粉末喷涂的特点等内容。     

静电粉末涂装生产线及工艺实践

Simply introduce the electrostatic powder coating product line and technology.     

浅谈粉末静电喷涂工艺及常见缺陷防治

简要介绍粉末涂料的组成、特性及其喷涂原理,详细阐述粉末静电喷涂工艺及喷涂注意事项,同时就粉末涂装常见的缺陷进行分析并提出防治措施。     

静电粉末喷涂回收装置浅谈

静电粉末喷涂中的涂料可回收再用,有利于降低生产成本及提高涂层质量。因此,静电粉末喷顺收装置的研究具有重要意义。本文阐述了静电粉珂喷涂回收装置的分类及特点,报静电粉珂喷涂回收装置在使用过程中易出现的各种问题。     

粉末静电喷涂中的三种涂层剥落

我公司冰箱、冰柜外观件用环氧－聚酯粉末喷涂,一次喷涂可达６０μｍ,耐腐蚀性能好、光泽度高、色调美观淡雅。在生产中曾遇到三次涂层剥落的现象,我们找到了问题的原因。文献〔１〕中指出涂层剥落的三种原因为：１）表面除锈不净;２）表面除油不净;３）粉末附着力差。我们发现的另三种原因为：１）粉层下有脏物。由于前处理水洗不净和上层工件背面杂质的滴落,工件在烘干后有明显或不明显的痕迹,被粉末覆盖固化后成为隐患。此类剥落的特点是：发生在工件的边缘较多,且当工件存放一段时间后才表现出来。正因为是由脏物引起,也为防止…     

粉末静电喷涂工艺在冰箱涂装中的应用

粉末静电喷涂工艺实际应用的过程中有着良好的应用效果,分析了喷涂工艺的原理以及固化成膜机理,进而提出在冰箱喷涂中的应用。     

浅谈粉末静电喷涂工艺

简单介绍了粉末静电喷涂工艺的优点、过程及原理。     

静电粉末喷涂中一次上粉率浅析

分析了静电粉末喷涂中影响一次上粉率的主要因素以及在应用中如何提高一次上粉率。     

粉末静电喷涂在冰箱涂装中的应用

阐述了粉末静电喷涂工艺的基本原理和粉末涂料固化成膜的机理;介绍了粉末静电喷涂技术在科龙公司冰箱涂装线上的应用,分析了固化成膜后的涂膜外观质量。     

粉末静电涂装涂膜弊病分析及对策

通过对粉末静电涂装产生涂膜弊病原因的分析,找出预防的对策,以提高涂装涂膜质量。     

灯饰镀件的静电喷涂封闭工艺

介绍了灯饰镀件静电喷涂常用的涂料、施工工艺、施工设备及影响静电喷涂的因素等。     

粉末静电涂覆机理的探讨

文章指出用“电晕充电”理论难以解释粉末静电涂覆实践中出现的一些现象,提出了“极化充电”的观点,并按此观点提出等场强静电喷涂的概念,用其分析了三种静电喷涂技术。     

粉末涂层陶瓷材料的涂层工艺及涂层机理

对使用Ａ２Ｏ３溶胶在硬质合金粉末表面涂层Ａ１２Ｏ３陶瓷进行了研究。重点探讨了基体粉末的表层处理、粉末涂层对Ａ１２Ｏ３涂胶的要求以及使用Ａ１２Ｏ３溶胶涂层硬质合金粉末的涂层工艺,最后,对有些硬质合金粉末引起Ａ１２Ｏ３溶胶在涂层过程中发生凝胶的凝胶机理、粉末涂层法的涂层机理进行了分析。认为硬质合金粉末对Ａ１２Ｏ３溶胶中胶体粒子的离子氛围的影响是使溶胶发生凝胶与否的关键。涂层机理则是硬质合金粉末表面通过     

COMPARISON OF LIQUID-LIQUID DISPERSIONS FORMED BY A STIRRED TANK AND ELECTROSTATIC SPRAYING*

Two methods of producing liquid-liquid dispersions are compared in terms of the dispersed phase drop-size, energy requirements, and other properties. In the first method, a stirred-tank contactor, used for laboratory bioprocessing studies, was employed. Experiments were conducted using a l0cm-diameter cylindrical tank, stirred by one or two 5cm-diameter 6-blade Rushton-turbine impellers. The transient drop-size distribution of kerosene in water was measured by a video technique. It was found that (irpar; the drop-size had not reached steady state even after 10 hrs of agitation, and (iirpar; the drop-size produced by one impeller was smaller than that produced by two impellers. In the second method, aqueous droplets were electrohydrodynamically generated at the tip of a metal capillary under the influence of a pulsed, direct-current (dcrpar; voltage. The capillary tube was located co-axially at the center of another tube made of a dielectric (teflonrpar; wall. Kerosene was pumped between the capillary and the outer tube. An electric field was formed between the electrically-grounded capillary tube and an electrified electrode mounted on the external surface of the outer dielectric tube. Positive, sinusoidal-type voltage pulses in the range of 10-25 kV at frequency between 3.4 and 3.7 kHz were applied and the electric current was measured. The size of the drops ejected from the capillary was measured by a laser light scattering facility and found to be in the range 1 to 100 μm. Single and multiple spraying cones were observed depending on the aqueous-phase flow-rate. Smaller drop-size was obtained when multiple-cone spraying occurred. Energy calculations showed that dilute dispersions can be produced more efficiently by electrostatic spraying than by mechanical agitation.     

“绵绵漆”粉末涂料的制备工艺

以四甲氧基甲基甘脲为交联剂,在酸催化剂作用下与羟基聚酯树脂等反应制备了“绵绵漆”粉末涂料。介绍了“绵绵漆”粉末涂料的制备、施工工艺及其影响因素。     

柠檬酸盐溶液—液相包裹法制备超细PTCR粉末的研究

通过复合柠檬酸盐溶液喷雾干燥法制备掺杂ＢａＴｉＯ３粉末，再经液相包裹法添加烧结助剂的和受主要持，制得了超细，化学均匀性好，烧在性大于的ＰＴＣＲ粉末。掺杂ＢａＴｉＯ３粉末的实际粒径范围为２０－５０ｎｍ，烧结助剂和受主杂质可通过液相包裹技术均匀地包裹在掺杂ＢａＴｉＯ３超细粉末颗粒表面，用这种粉末烧结制得的ＰＴＣＲ样品，具有孤ＰＴＣＲ效应。