KR-20260067585-A - MANUFACTURING METHOD OF ELECTROMAGNETIC WAVE SHIELDING COATING SOLUTION FOR NUCLEAR POWER PLANT DECOMMISSIONING REMOTE EQUIPMENT DRONE

Abstract

The present invention relates to a method for manufacturing an electromagnetic shielding coating solution for a drone used as a remote equipment for nuclear power plant decommissioning, comprising: a CNT milling process (S10) for finely particleizing carbon nanotube (CNT) powder using a dynomill; an intermediate manufacturing process (S20) for manufacturing a coating solution intermediate by mixing and stirring water, a surfactant, an acidity regulator, and an additive; a primary filtering process (S30) for filtering the coating solution intermediate obtained from the intermediate manufacturing process (S20) to a particle size of 500 to 1000 nm using a primary filter; a centrifugation process (S40) for obtaining a fraction by separating the coating solution intermediate that has passed through the primary filtering process (S30) by centrifugation; and a CNT pigment mixing process (S50) for mixing a pigment mixed with the carbon nanotube fine powder obtained from the CNT milling process (S10) with the fraction obtained from the centrifugation process (S40). The method is characterized by manufacturing a coating solution that provides electromagnetic shielding performance by adsorbing and coating the exterior of a remote equipment drone used in nuclear power plant decommissioning work with mist spraying, by including a secondary filtering process (S60) in which a carbon nanotube pigment mixture obtained from a CNT pigment mixing process (S50) is filtered to a particle size of 800 to 1000 nm using a secondary filter.

Inventors

• 윤광호

Assignees

• 주식회사 디티아이

Dates

Publication Date

20260513

Application Date

20241106

Claims (1)

1. A CNT milling process (S10) for finely grinding carbon nanotube (CNT) powder using a dyno mill, and An intermediate manufacturing process (S20) for manufacturing a coating solution intermediate by mixing and stirring water, a surfactant, an acidity regulator, and an additive, and A primary filtering process (S30) for filtering the coating liquid intermediate obtained in the above intermediate manufacturing process (S20) to a particle size of 500 to 1000 nm using a primary filter, and A centrifugation process (S40) for obtaining fractions by separating the coating liquid intermediate that has undergone the above primary filtering process (S30) into layers by centrifugation, and A CNT pigment mixing process (S50) in which a pigment is mixed with carbon nanotube fine powder obtained in the CNT milling process (S10) to the fraction obtained in the above centrifugation process (S40), and The method includes a secondary filtering process (S60) for filtering the carbon nanotube pigment mixture obtained in the above CNT pigment mixing process (S50) to a particle size of 800 to 1000 nm using a secondary filter, and In the above intermediate manufacturing process (S20), A coating solution intermediate is prepared by combining 20 to 30 parts by weight of water, 4 to 10 parts by weight of a surfactant, 2 to 5 parts by weight of an acidity regulator, and as additives, 1 to 4 parts by weight of an antifoaming agent, 2 to 7 parts by weight of an emulsifier, 3 to 7 parts by weight of a humectant, 4 to 11 parts by weight of a thickening agent, 3 to 12 parts by weight of a binder, and 2 to 5 parts by weight of a preservative. A method for manufacturing an electromagnetic shielding coating solution for a remote equipment drone for nuclear power plant decommissioning, characterized in that in the above CNT pigment mixing process (S50), the pigment is mixed in an amount of 10 to 30 parts by weight relative to the total weight of the coating solution intermediate, and the carbon nanotube fine powder is blended in an amount of 5 to 20 parts by weight relative to the weight of the pigment, and the coating solution is obtained by adsorbing and coating the outside of the case of a remote equipment drone used in nuclear power plant decommissioning work by mist spraying to provide electromagnetic shielding performance.

Description

Manufacturing Method of Electromagnetic Wave Shielding Coating Solution for Nuclear Power Plant Decommissioning Remote Equipment Drone The present invention relates to a method for manufacturing an electromagnetic shielding coating solution for a drone used as remote equipment for nuclear power plant decommissioning. More specifically, it relates to a method for manufacturing a coating solution that provides electromagnetic shielding performance and blocks the occurrence of noise phenomena when applied to a drone, which is equipment used to measure radiation leakage doses remotely and unmanned during nuclear power plant decommissioning operations. Generally, the nuclear power plant decommissioning process proceeds in the following order: a decommissioning preparation process to establish a decommissioning plan during the cooling period of the permanently shut down reactor; a decontamination process to remove contamination using physical, chemical, and electrical technologies; a cutting and demolition process to remove facilities, main equipment, and the final containment building; a waste treatment process to handle radioactive waste generated through decontamination and decommissioning; and an environmental restoration process to investigate and evaluate residual contamination levels. In order to prevent radiation exposure accidents caused by radioactive waste and contaminants generated at nuclear power plant decommissioning sites, which typically cover vast areas of hundreds of thousands of square meters, there is a need for detectors capable of multi-faceted real-time monitoring; to this end, unmanned remote radiation detection systems are being utilized on-site. In particular, with the recent advancement of drone-related technology, the development of drone-based unmanned remote radiation detection modules is underway. Drone-based unmanned remote radiation detection modules are used to measure radiation leaking into and outside the interior of nuclear power plant containment vessels where humans cannot approach to measure radiation. By operating drones weighing less than 200g in the air above the nuclear power plant decommissioning site, they have the advantage of being widely utilized from the decommissioning preparation process to the waste treatment process. As an example of a disclosed technology, Korean Registered Patent No. 10-2019891 comprises a method for measuring residual radiation at a nuclear facility site, comprising the steps of: dividing a nuclear facility site into a plurality of areas having a predetermined area; attaching a radiation measuring device equipped with GPS and a communication means to an unmanned aircraft and having it fly for a predetermined time while separated from the ground in each area by a predetermined distance to measure residual radiation; transmitting the measurement value by wireless communication from the communication means of the radiation measuring device to a personal terminal; collecting the measurement value of the radiation measuring device by area from the personal terminal; mapping the measurement value collected by area onto a map through a data processing program; measuring residual radiation by area using a radio-controlled vehicle equipped with GPS, a radiation measuring device, and a communication means at the nuclear facility site; and transmitting the measurement value by wireless communication from the communication means of the radio-controlled vehicle to a personal terminal and collecting the measurement value for the area from the personal terminal. Meanwhile, strong electromagnetic waves emitted from various electronic devices and facilities within the nuclear power plant decommissioning site cause noise phenomena, leading to Electromagnetic Interference (EMI) problems such as degrading the quality of signals transmitted and received between drones and remote systems, causing malfunctions of internal devices, and limiting the scope of work; therefore, the application of technology for shielding electromagnetic waves is essential. A configuration for mounting a device for shielding electromagnetic waves on a drone according to the prior art is known, for example, as described in Korean Published Patent No. 10-2018-0054984, which includes a plate-shaped lower member composed of multiple layers formed by alternately stacking cork layers and metal layers, and a dome-shaped cover member composed of multiple layers formed by alternately stacking cork layers and metal layers and covering the upper part of the lower member. FIG. 1 is a process flow diagram of a method for manufacturing an electromagnetic shielding coating liquid for a remote equipment drone for nuclear power plant decommissioning according to the present invention. Hereinafter, the structure and operation according to a preferred embodiment of the method for manufacturing an electromagnetic shielding coating solution for a remote equipment drone for nuclear power plant decommission