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Everwide Newsletter No.132


Experiment § Gap-filling glue of relay

Relay is a kind of electronic control device (left figure), which has the functions of safety protection and conversion circuit in the circuit. And Everwide’s application in this regard is "gap-filling glue", which is used to pour the glue into the gap between the casing and the body, and after curing, it can achieve an air-tight effect. Some customers have tested that this glue cannot conduct electricity during the reaction under high temperature or long-term use. We further analyzed the reasons. First, there is the infiltration of precipitates in the casing, so the volatiles adheres to the parts and causes insulation. Second, excessive stress causes the pins to separate. The solution can be to add a thixotropic agent so that the resin is not easy to sag during baking and there will be no segregation phenomenon. When the stress is too large, rubber can be added to the formula or the temperature can be slowly restored after baking to reduce the stress. According to the requirements of different customers, Everwide currently has products of high-temperature type (120℃, 100℃) and low-temperature type (80℃, 70℃), as well as meet UL specifications and low halogen specifications.

─Author: Ms. Li-Ling, Liu

 

Activity § Tracking test(CTI)

Recently, Everwide purchased tracking test apparatus (Figure 1). This instrument is a method (Comparative Tracking Index, CTI) to evaluate how much voltage the material can withstand without leakage when the surface of the material is contaminated. During the experiment, two platinum electrodes of fixed specifications were set up on the surface of the material, and a fixed voltage alternating current (for example, 300 volts) was applied. Then between the two electrodes, one drop of 0.1% ammonia chloride solution was dropped every 30 seconds. The contaminated liquid will show resistance in the energized circuit and generate heat, and will eventually evaporate (Figure 2~4). A total of 50 drops of the solution will be dropped throughout the experiment, and then to observe whether the insulating material will leak. Once the leakage of 0.1A occurs during the process for more than 0.5 seconds, it is recorded as a fault and the experiment is stopped. If there is no failure after dropping 50 drops of contaminated liquid, it means that the insulating material can pass the test (for example, 300 volts), so we can further increase the voltage of 400, 500, or 600 volts until the applied voltage causes the test to fail, then this voltage is the CTI data of the material. The CTI of the Tracking test is a very important parameter. It has a high reference value in the fields of electronic instruments, electrical equipment, and electrical instruments. In the future, it can help customers to grasp the materials more accurately.

─Author: Ms. Zi-Hui, Huang

 

Knowledge § Can single-component epoxy resin be cured in stages?

Uncertain. Take the one-component epoxy resin system in which the curing agent is powder as an example. We use two curing agents with different temperature ranges of 80℃ and 120℃ at the same time, and then directly carry out the curing reaction at high temperature to obtain the ideal cured product. If the front reaction of the above-mentioned combination is carried out at a low temperature, and then the latter reaction is carried out at a high temperature, this kind of composite composition may obtain an incomplete curing result. The reason for the above results is related to the temperature sensing range of the curing agent. The curing agent of low-temperature reaction type will begin to melt into the resin and react when heated in the previous process. If the reaction rate of the resin is close to the gelation point, the curing agent of high-temperature reaction type will be like being covered by these products, so even if the latter reaction of the process is completely melted, it can not evenly diffuse into the resin leading to incomplete curing phenomenon.

 

Living § Done ≠ Do well

My uncle and my colleagues made a few slogans that read "Done ≠ Do well " and posted them on the walls of the factory. The simplest meaning of this sentence is that he hopes that everyone can build a consensus together and it is best to do things well. I recently walked into the industrial area and found many road signs wrong. For example, the road sign in Figure 1 needs to be turned 180 degrees flat, the road sign in Figure 2 needs to be turned back 90 degrees, and the icon in Figure 3 is best turned 90 degrees counterclockwise. These are all examples of the government spending our money to do things, but not doing things well. The map of the Douliu Industrial Zone is not a special case. Figure 4 is a guide map of the Dongshan rest station of the expressway and there are millions of people coming and going there every year. Who will teach me how to adjust the direction of the sign? Fortunately, the Taiwanese are extremely smart. No one has ever looked for Everwide Chemical because they believe in road signs. Some people will study the road signs until they understand the right direction. Some people use Google to navigate because there is a position of Everwide. Or you can check the illegal road signs set by the manufacturer (Figure 5). That's right, you don't need to bother to find "Dougong Six Road", we are right next to "Chaolu Fish Shop" or "DEENO Living Hall". Although no one gets lost, doing things but not doing them well will only waste manpower and material resources, and sometimes it is more irritating than not doing things. While complaining about the government, we also reflect on ourselves. If we make things of poor quality, then customers, colleagues, and the company who trust us will suffer losses. Do you feel the same when dealing with these abnormal situations and looking at the wrong road signs to find your way? "Done ≠ Do well". We must always review the standards of "doing well" and thinking about how to "do well" the work. After long-term continuous efforts, the quality of our work has gradually improved. I believe that in the near future, we will say to everyone: At Everwide, "done" means "do well."

─Author: Dr. Ming-Xu, Li




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