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Everwide Newsletter-No.61


Experiment § Application of UV glue on glass furniture

People always thought that glass furniture made people feel insecure when using it in the past. Nowadays, glass materials mainly used for home decoration have not only achieved breakthroughs in thickness and transparency, but also made the furniture made of glass have both reliable and practicability, and inject the effect of art in the production so that the glass furniture has the effect of decorating and beautifying the room while exerting the practicability of the furniture. Glass furniture generally uses high-hardness tempered glass, and the transparency and clarity of glass are 4 to 5 times higher than that of ordinary glass. High-hardness tempered glass is strong and durable and can fully bear the same weight as wooden furniture. It has the characteristics of high transparency, fast curing speed, good toughness, and is not easy to yellow.

* Features of Everwide UV glass glue: 1. It has high transparency and is not easy to yellow. 2. The curing speed is fast, and it is irradiated by ultraviolet light for a few seconds. 3. Excellent penetration and flow properties, not easy to generate air bubbles, and convenient for construction. 4. Pass the severe high temperature and high humidity and cold and heat cycle and even long-term soaking test. 5. The bond strength to the glass after curing exceeds the strength of the glass itself.

─Author: Mr. De-zhong, Chen, R&D Assistant Engineer, Everwide Chemical

 

Environment § Everwide's Treasure House (Part 2) - Everwide Chemical Room

"Find the medicine with me!" It is another of our secret skills to break through the predicament. Everwide Chemical classifies and archives the samples collected over the years. About 4,200 samples have been collected so far. On the one hand, the electronic archives of spectra and data are systematically established. On the other hand, these drugs are put on the shelves to meet the diverse needs of everyone in experiments. The library and drug room of Everwide Chemical are like a huge treasure area, where everyone can keep digging for treasures and seeking inspiration for experiments. Whether books or medicines, they are good partners for R&D personnel. We combine the two into one to keep creating more and better products.

 

Knowledge § Reaction mechanism of epoxy resins and acid anhydrides

As shown on the left, the unshared electron pair on the tertiary amine will attack the acid anhydride to form a negatively charged acid anion structure. This acid anion will react with the α carbon atom on the epoxy resin, causing the epoxy resin to open the ring, an anion of oxygen is formed. This anion of oxygen element will attack the acid anhydride again, and the two will continue to repeatedly interact with each other, resulting in cross-linking of epoxy resin. The cross-linking points of this type of reaction are all constituted by ester groups. In the absence of a catalyst, there is a little reaction between the epoxy resin and the acid anhydride. The tertiary amine catalyst will make the epoxy resin and acid anhydride react with each other and cause the self-polymerization of the epoxy resin itself. So in the formulation of epoxy resin and acid anhydride type hardener, epoxy resin, and acid anhydride. The equivalence ratio of epoxy resin is often not 1:1, the common ratio is 1:0.8~0.9, and the remaining proportion of epoxy resin can obtain the best performance through self-polymerization. A few exceptions appear in LED packaging, where the equivalent ratio of epoxy resin and acid anhydride is often above 1:1.1. The purpose is to avoid the self-polymerization of epoxy resin, resulting in poor transparency and yellowing of the cured product.

 

Living § The world under the microscope (Part 2)

I asked the children to take out their hands to observe the fingerprints first because some children did not wash their hands, so a lot of black dust could be seen on the fingerprints. If you eat with such dirty hands, of course, you will get sick! I also took out the thousand-yuan bills and observed the beautiful patterns and anti-counterfeiting functions. It turns out that the microscopic world is so fascinating! Xiao Qiao's mother brought staining solution, we prepared toothpicks to scrape the children's oral epidermal cells, and we observed it! As you can see in Figures 1 and 2, some liquid is about to flow away. That's because the light source is hot, and we need to adjust the focus, so we quickly took the image before the dyeing liquid was about to evaporate. Although the picture is not very ideal, the oral epidermal cells can be seen throughout. Although our middle school biology class has already done this experiment, after more than 20 years, we observed the oral epidermal cells of each child again, and we were still very excited (Figure 3 and Figure 4). What's so fascinating about science? When you accidentally discover a phenomenon by yourself, you will suddenly feel highly excited at that moment, and you will love this experience very much. This feeling is called enthusiasm. If you often have that kind of experience, you are halfway there. Can you guess what pictures 5 and 6 are taking? Reminder: Figure 5 is about people; Figure 6 is about pigs. If I write the English letter "AB," what is the difference between seeing it under a dissecting microscope and a general microscope? Dear friends, use your brains!

─Author: Ms. Miao-ling, Lin, R&D Engineer, Everwide Chemical




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