Experiment § Possible chelation reaction of non-tin catalyst
Condensed silicone rubber (RTV1) or modified silicone rubber (MS, STPU) are often used to make moisture curing adhesives. We usually add metal catalysts into these formulation to increase the reaction speed. Furthermore, different types of catalysts will have different catalytic capabilities. Currently, organotin catalysts are the fastest and most widely used. However, due to environmental issues, some applications have begun to restrict the use of organotin catalysts, and the trend is expanding. When changing to other types of organometallic catalysts, some problems have never happened. For example, when the catalytic rate is slow or under some situations that the organometallic catalysts may change color. (Figures 1 and 2 are the non-tin formula comparison). Non-organotin metal catalysts will cause cloudiness and discoloration, which is usually related to the adhesion promoter in the formula. Because many adhesion promoters have amine groups, which may chelate these metal catalysts, they will cause changes the center metal orbit and causing color changes. This phenomenon may occur after a period of time. The strange thing is that these discolored resins often have the same characteristics in terms of reactivity and adhesion. It might be the chelation reaction a small amount, so the considerable proportion of catalyst and adhesion promoter still can function in the formulation. On the other hands, these unexpected reactions cannot be noticed at the first time, we have to be very careful when designing the formula and use accelerated experiments to evaluate and avoid discoloration.
─Author: Mr. Chih-Yu, Huang
Activity § Wish you peace
At the end of August and early September, we focused on the word "peace". First of all, on the Ghost Festival, we prayed for everyone's peace and happiness. (Figure 1). Secondly, interns finished their summer work jobs and had an excellent dinner party together (Figure 2). Thirdly, our General Manager- Mr. Chen is healthy and took this opportunity to greet everyone (Figure 3).What’s more, "Peace" is based on daily training and preparation: new employees participated in the labor safety and health outreach (Figure 4). Carry out the operating environment monitoring once in every six months (Figure 5). From the second week of September, we conducted an internal audit of OH&S management systems 45001. We hope everyone is staying safe and healthy.
Knowledge § Why bonding area of super glue become brittle?
The main component of super glue is cyanoacrylates. This component has small molecular weight, low viscosity, and large volatility. Before the super glue has not cured, this component behaves like a solvent and has good penetration ability on the surface of the substance. It may corrode some hard plastics and cause tiny cracks in the plastics. These tiny cracks will grow quickly in the presence of stress and make bonding regions significantly brittle. Another is about using super glue to bond rubber or soft PVC. The super glue is quite hard which is compare to these materials. When it penetrates into soft materials, the elongation and tear strength of soft materials will deteriorate. It is the reason why the area where the super glue will brittle.
Living § Angel's Tears
My friends had invited me to go to mountain climbing of Jiaming Lake. The nine kilograms backpack is very heavy. I have thought about afraid of this hard work, but I like the sense of accomplishment. At the mountain control station, we listen the precautions and the "One person, One kilogram" activity. I want to do something for this great activity, so I move three small shovel of gravel to 3.5 kilometers. Even it is a little things, but it truly makes me happy by doing this. We walke and chatted when we just set off. Later, some people gradually have fallen behind and others take of the ahead. I moved at my own speed: Marathon is not only competition the speed, but also compete the mind in your heart. Gradually, I begin to feel exhausted and finally arrived at the mountain house. The next day I take less equipments to battle for the mountaintop, so I feel much better. The sky along the way is blue and the clouds are white, and the rolling hills are spectacular. Finally, we arrival the angel’s tear, Jiaming Lake, without working too hard. Everyone take a walk, take pictures, and take a rest by the lake, and then we go to Sancha Mountain. The skull of a sambar is placed on the triangle of the Sancha Mountain, which is a bit scary for me. In the afternoon, we go back to the mountain house, and there are no water, no electricity, and no signal. I thought it is a special experience in my life. On the third day, we set off before dawn and reach the top of Xiangyang Mountain easily. Although the sun rises, we see the "Brocken Phenomenon", it is rare to see. After go down the mountain, we cook instant noodles in the mountain house and had delicious meal! The mountain guide said that our team is lucky because the weather was good, and we see the magnificent scenery. I really can't agree more.
─Author: Ms. Pei-Yu, Wu
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