Experiment § Long-chain epoxy resin polymerization
Common thermoplastics generally have long-chain structures. The long-chain structure has good flexibility and mechanical strength, but it does not have a good adhesion effect. However, although the epoxy resin we know well has good adhesion, its molecular weight is not high enough and its mechanical properties are not good. If the long chains can be connected by polymerization, and the properties of thermoplastics and epoxy resins can be combined, not only the mechanical properties can be improved, but also the substrates that are not easy to adhere to can adhere through more diversified functional groups. Everwide Chemical uses scientific calculations to polymerize high-molecular-weight, long-chain epoxy resins, which are not only higher than the original molecular weight of pure resins but are also used as primers for bicycle seat substrates. It overcomes the dilemma that epoxy resin is not easy to bond with Nylon materials. In addition, the solvent-based formula is easy to apply and dries quickly, which will effectively shorten the working time. Do an Adhesion Cross-Cut Test on the dried coating layer, and it can reach Class 5B without peeling off at all. The long-chain epoxy resin has such an ideal adhesion effect, which is the goal of Yongkuan Chemical which has been working hard to provide customers with the best quality.
─Author: Mrs. Jin-Rong, Li Assistant R&D Engineer, Everwide Chemical
Activity § Training plan for new recruits
With the growth of business volume, Everwide Chemical has started to recruit talents again. Continuing the training experience of running three batches of R&D assistants last year, this year will copy the training plan to other departments, including business, manufacturing, and small batches. The work during the training is very tight. There are six hours a day to do production and clean up, read two hours of textbooks, ask questions or go to class for two hours. There are also exams during the training period. In addition, there are long working hours and fewer vacations, so this is not an easy time. For Everwide, the implementation of the training plan is also a huge workload: we need a lot of teaching materials, the guidance of many lecturers and assistants, the use of any external resources for teaching, and a lot of money for training plans. However, in order to make our talents promotion, education, training institutionalized and modularized, relevant colleagues are working hard to adhere to our ideals. The work partners recruited by the training program have the following characteristics: hardworking and dedicated, relatively easy to build professional skills, humble and kind working attitude, and relatively high job stability. Many people say that Everwide is like a school because we are trying new ways every day and we are also learning new things with our partners. Any friends who are interested in our training program are welcome to refer to the relevant website:
Knowledge § Why do some epoxy resins have oily or foggy surfaces after curing?
Some epoxy resins will have oily and foggy surfaces after curing. There are two possible causes: (1) The compatibility of epoxy resin and hardener is not good. (2) It is caused by the curing agent absorbing moisture and carbon dioxide. Regarding the former, it was introduced in the last issue of the e-newsletter, please refer to Issue 89-What is the induction time of epoxy resin? Some fatty amine curing agents have high hydrophilicity. They will quickly absorb moisture in the air and cause the surface of the cured product to be atomized due to high water content, and even further react with carbon dioxide in the air to form insoluble ammonium carbonate, forming a whitened and powdered surface. This kind of phenomenon will be especially obvious in the case of high humidity, low temperature, and slow reaction speed. The curing agent with fast moisture absorption speed must be closed tightly during storage. We must pay more attention to the use of curing agents that can form ammonium carbonate with carbon dioxide. We must prevent the agglomerated product from falling into the mixing machine and blocking the pipeline, causing production losses.
Living § Where is the air? (2)
Children must have similar experiences, the balloons blown with mouths cannot fly, but balloons in parks can fly. What is the reason? Because one is air blown out of the mouth, and the other is helium injected from a helium cylinder. Helium is lighter than air, so hydrogen balloons will float. The author once read a book written by a little girl. The book described her family was very poor when she was a child, and she would go to the Mazu Temple in Beigang to sell balloons during the Chinese New Year. Once because she wanted to buy some food, she accidentally let go of her hand, and all the balloons in her hand flew into the sky, causing all the balloons bought from the wholesaler to disappear. Watching the balloons keep flying towards the sky, the little girl's tears kept falling, and I could understand how she felt when she lost everything. Sometimes our life process will be unsatisfactory, but we must face setbacks bravely. After listening to this short story, we learned another gas "helium". How to prove the oxygen content? We did a burning experiment. After the candle was burned, the glass bottle was covered, and the glass water level would rise to one-fifth of the total air volume. Since oxygen is consumed during the combustion process, the rising water level can roughly represent the oxygen content. Oxygen accounts for about one-fifth of the total amount of air, and most of the remaining gas is nitrogen accounting for about four-fifths, and the other very small amounts are carbon dioxide or a small amount of inert gas.
─Author: Ms. Miao-Ling, Lin R&D Engineer, Everwide Chemical
