유기용제를 사용하는 기존 도장 방법은 VOC 등 환경오염을 야기하는 유해성물질을 배출하는 반면, 정전분체도장(Electrostatic Powder Coating : EPC)시스템은 대기 중에 유해성물질을 방출하지 않는 친환경적인 기술로, 1960년대 처음 도입된 이래 자동차, 전력기기, ...
유기용제를 사용하는 기존 도장 방법은 VOC 등 환경오염을 야기하는 유해성물질을 배출하는 반면, 정전분체도장(Electrostatic Powder Coating : EPC)시스템은 대기 중에 유해성물질을 방출하지 않는 친환경적인 기술로, 1960년대 처음 도입된 이래 자동차, 전력기기, 전자제품 등 다양한 산업에서 사용되고 있다. 그러나 정전분체도장시스템은 고전압(60~120㎸)을 사용하여 도장을 하기 때문에 분진의 화재·폭발에 의한 사고 가능성이 크고, 실제로 정전분체도장 사업장의 사고는 국내뿐만 아니라 선진국에서도 빈번하게 발생하고 있다. 또한 다양한 연구를 통하여 분체도장과 관련된 분진폭발위험성이 제기되고 있으며, 현재 사용되는 분체도료는 입경의 감소, 다양한 색상을 위한 안료 첨가 및 고전압의 영향으로 최소점화에너지가 낮아질 가능성도 내포하고 있다. 따라서 본 논문은 자동차, 전기기계·기구류 등에서 광범위하게 사용되고 있는 분체도료 중 Epoxy와 Polyester 도료를 대상으로 정전기방전에 의한 점화위험성에 대해 실험·고찰하여 기준을 제시함으로서 관련 산업에서의 분진폭발사고를 사전에 방지하고자 수행하였다.
유기용제를 사용하는 기존 도장 방법은 VOC 등 환경오염을 야기하는 유해성물질을 배출하는 반면, 정전분체도장(Electrostatic Powder Coating : EPC)시스템은 대기 중에 유해성물질을 방출하지 않는 친환경적인 기술로, 1960년대 처음 도입된 이래 자동차, 전력기기, 전자제품 등 다양한 산업에서 사용되고 있다. 그러나 정전분체도장시스템은 고전압(60~120㎸)을 사용하여 도장을 하기 때문에 분진의 화재·폭발에 의한 사고 가능성이 크고, 실제로 정전분체도장 사업장의 사고는 국내뿐만 아니라 선진국에서도 빈번하게 발생하고 있다. 또한 다양한 연구를 통하여 분체도장과 관련된 분진폭발위험성이 제기되고 있으며, 현재 사용되는 분체도료는 입경의 감소, 다양한 색상을 위한 안료 첨가 및 고전압의 영향으로 최소점화에너지가 낮아질 가능성도 내포하고 있다. 따라서 본 논문은 자동차, 전기기계·기구류 등에서 광범위하게 사용되고 있는 분체도료 중 Epoxy와 Polyester 도료를 대상으로 정전기방전에 의한 점화위험성에 대해 실험·고찰하여 기준을 제시함으로서 관련 산업에서의 분진폭발사고를 사전에 방지하고자 수행하였다.
Recently, the technology to control powder activities through the corona electrification has been rapidly developed and applied to industries of the electrostatic painting, electrostatic precipitation, electrostatic pesticide-deposit and so on. Especially, new painting technology has been asked and ...
Recently, the technology to control powder activities through the corona electrification has been rapidly developed and applied to industries of the electrostatic painting, electrostatic precipitation, electrostatic pesticide-deposit and so on. Especially, new painting technology has been asked and investigated because existing painting systems can make serious air pollutants, such as thinner, toluene, VOC (Volatile Organic Compound), etc. Therefore, electrostatic Powder Coating (EPC) System has been known as an alternative system and employed more and more in the developed countries. However, there is a possibility to make a fire and explosion in the system because of the application of high voltages(60~120㎸) as an ignition. Lots of accidents in the EPC companies have been reported and increased in practice. MIE (Minimum Ignition Energy) should be investigated and prescribed for the safety reason because it is a basic and important factor to prevent the dust explosion in the system. The Hartmann systems, which is widely employed in the world and in this study to measure the MIE, have some problems, for example, the MIE of powder would be affected and changed seriously by the applied voltage, by electric field and by the experimental circumstances. However, these experimental influences almost have not been investigated carefully so far. The objectives of this thesis is to (1) make experiments to find out the effect of corona electrification on the MIE of powder, (2) search the mechanism of fire and explosion of powder charged by electrostatic energy. The research contents explaining the experimental method and the ignition risk of charged powder are as following : 1. Assess the MIE by new ultrasonic vibration equipment : (1) To measure the MIE of powder (2) To measure the MIE of charged powder (3) To investigate the combustion of powder depending on the discharge condition (4) To measure the change of the MIE of powder by the corona charging, (5) To find the reason why the MIE would be changed. 2. Construct the EPC system and analyze basic abilities : (1) To measure the amount of the electrostatic charging of powder paints, such as acryl and nylon (2) To estimate the fluidity of particles by the electric charge (3) To estimate the electrostatic charging depending on the position of sprayed powder (4) To estimate the electrostatic charging depending on the voltage, flow rate and so on.
Recently, the technology to control powder activities through the corona electrification has been rapidly developed and applied to industries of the electrostatic painting, electrostatic precipitation, electrostatic pesticide-deposit and so on. Especially, new painting technology has been asked and investigated because existing painting systems can make serious air pollutants, such as thinner, toluene, VOC (Volatile Organic Compound), etc. Therefore, electrostatic Powder Coating (EPC) System has been known as an alternative system and employed more and more in the developed countries. However, there is a possibility to make a fire and explosion in the system because of the application of high voltages(60~120㎸) as an ignition. Lots of accidents in the EPC companies have been reported and increased in practice. MIE (Minimum Ignition Energy) should be investigated and prescribed for the safety reason because it is a basic and important factor to prevent the dust explosion in the system. The Hartmann systems, which is widely employed in the world and in this study to measure the MIE, have some problems, for example, the MIE of powder would be affected and changed seriously by the applied voltage, by electric field and by the experimental circumstances. However, these experimental influences almost have not been investigated carefully so far. The objectives of this thesis is to (1) make experiments to find out the effect of corona electrification on the MIE of powder, (2) search the mechanism of fire and explosion of powder charged by electrostatic energy. The research contents explaining the experimental method and the ignition risk of charged powder are as following : 1. Assess the MIE by new ultrasonic vibration equipment : (1) To measure the MIE of powder (2) To measure the MIE of charged powder (3) To investigate the combustion of powder depending on the discharge condition (4) To measure the change of the MIE of powder by the corona charging, (5) To find the reason why the MIE would be changed. 2. Construct the EPC system and analyze basic abilities : (1) To measure the amount of the electrostatic charging of powder paints, such as acryl and nylon (2) To estimate the fluidity of particles by the electric charge (3) To estimate the electrostatic charging depending on the position of sprayed powder (4) To estimate the electrostatic charging depending on the voltage, flow rate and so on.
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