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Everwide Newsletter-No.139


Experiment § Solvent-based product solid content detection

Solvent-based products often have a solid content test item, and the test method is nothing more than weighing with a balance. The most precise balance is the thermogravimetric analyzer (TGA, Figures 1~3), which performs stepwise isothermal scanning to obtain very accurate results. Secondly, good data can also be obtained using a precision balance of 0.1 mg (Figure 4). If the above equipment is not available, a standard scale (Figure 5) can also measure the solid content quickly and easily. The steps of the experiment are described as follows: 1. After resetting the scale to zero, place an empty weighing pan and record its weight (Wo). 2. Pour resin on the empty weighing pan and record its actual weight (Wa). 3. Heat the weighing pan and resin at a specific temperature and time, and then record the weight (Wb) after the solvent evaporates. Calculation of solid content: the weight of the weighing pan after heating with resin is subtracted from the weight of the weighing pan (Wb-Wo) and then divided by the original weight of the sample (Wa-Wo). Solid content = (Wb-Wo) / (Wa-Wo) The test method seems simple but needs some details: 1. Stir evenly before sampling; otherwise, different sampling points will cause errors. 2. The weight of the sample should not be too large, and the area of ​​the weighing pan should be large enough to avoid that the sample is too thick and the solvent is not easy to volatilize. 3. The heating temperature should be higher than the boiling point of the solvent. Still, it should not be too high to avoid the volatilization of the solid components and the resin-related components. The lower the solid content is <10%, the measured data will be less stable, and it will be necessary to do several times to average the data to improve the accuracy.

─Author: Mr. Yun-xian, Liu

 

Activity § Taipei International Bicycle Show

The "Taipei International Bicycle Show" is entering its 25th year this year. It is the largest bicycle exhibition in Asia and the world's top three professional bicycle exhibitions. All the latest, the most fantastic bikes can be seen at this event. The technology of making bicycles changes with each passing day, and adhesives combine many parts and components of different materials. Of course, Everwide Chemical is not absent. Many customers have proved that our adhesives have world-class quality. Of course, good things also need professional promotion. Heng Yen Enterprise is responsible for our sales in the bicycle field. Regardless of market dynamics, customer service, professional technology, etc., we have been highly affirmed by customers, and our market share has repeatedly reached new heights. Heng Yen Enterprise has been introducing our latest information at the Taipei Bike Show for four consecutive years, and you are welcome to visit and guide you. Venue: Taipei World Trade Center Nangang Exhibition Hall, booth number K1403 Time: March 20-22 (Wednesday to Friday), 09:00-18:00, 23rd (Saturday) 09:00-15:00

 

Knowledge § What is the reason why epoxy resin is easy to yellow at high temperatures?

The epoxy resin/amine hardener system of common DGEBA tends to yellow when stored at a slightly higher temperature for a long time. This phenomenon has a lot to do with amine hardeners because amines are originally chemical auxochromes and tend to develop color, especially at high temperatures, easy to yellow. The epoxy resin color becomes more yellow at high temperatures, which will not affect its mechanical properties, electrical properties, etc. In the TGA experiment, the decomposition temperature of epoxy resin is about 300°C or higher. At this time, the epoxy resin will change from yellow to dark brown. However, it is not scientific enough to judge epoxy resin from the change of color alone. Because many high-temperature resistant epoxy resins are dark brown, the darkening of the color does not mean that the cracking reaction must cause it. Other experiments are needed. To be able to judge.

 

Living § Be someone who can be used


My uncle spent the day and night with us every day in 2002, and his mantras have a great influence on us. For example, put a slogan "Done ≠ Do it well" in the factory, greet "old friends" when you see people, etc. There is another sentence I was very impressed with. He often said to our younger generations: "You try to use me as much as possible and treat me as someone who can be used." Uncle's sentence sounds a bit strange at first glance. How can we use our elders? What's more, everyone in our society is afraid of being "used by others"! My uncle's actions are indeed the same: he always cares about the progress of our experiments and helps us to read the information when we see things we don't understand; Japanese raw material suppliers come to be the right to serve as translators; he is enthusiastic when he meets customers he knows. It took us to visit on a business trip; at night, I would stir two recipes at hand and exchange experiences with us during the day. In addition, every morning when we were still asleep, my uncle shut the dog and opened the factory to clean the garden. In his leisure time, he and the gardener planted flowers and trees to beautify the environment, which our Everwide Chemical fully utilizes. My uncle's example of being "used by others" inspired me a lot. Does the workplace often care about who should do this stuff? Who is unfair than work? Eventually evolved into a problem of organizational development. Uncle is entirely different; it seems that everything can be done. He always finds places to contribute and actively thinks: Does doing these things help everyone? Then put it into action without asking for anything in return. It is the attitude of a great leader. It's no wonder that many customers, suppliers, and colleagues who have worked together often mention his deeds. In the past, when Everwide woke up early to exercise, the uncle always whistled at a brisk pace and looked at ease. I think it must be a very happy thing to be a "person who can be used." Just share this article with you, and thank my uncle for teaching us. I hope we can all take over and be someone who can be used.

─Author: Dr. Ming-xu, Li





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