Everwide Newsletter No.303
Experiment report § Low-temperature-curing winding molding resin< br />
Composite material winding molding (Figure 1): The fiber is impregnated with resin in the impregnation tank, and the position of the fiber on the mandrel is controlled through the movement of the guide ring and the rotation of the mandrel, and finally hardened and formed. Figure 2 is a gas cylinder wound with an aluminum preform as a mandrel. Epoxy resin is used in the filament winding molding process. There are two hardener systems. One is the amine hardener system. Its room temperature stability is relatively poor, but it has the advantage of low temperature curing, so it is suitable for use in small gas cylinders. Production; One is the acid anhydride hardener system, which has high viscosity and stability at room temperature, but most of them need to be heated to above 120°C to be fully cured. It is suitable for use in the winding method of large gas cylinders. In the acid anhydride system, Metropolis uses tertiary amines as catalysts. However, it is necessary to meet the viscosity stability of 4~8 hours or more for the operation time, and it can be completely cured at low temperature, which limits the use of this type of catalyst. Everwide Chemical has recently developed a catalyst that can make the Tg of the resin exceed 100°C after 100°C/4 hours (Figure 3). It can achieve a high reaction rate without further post-curing at a higher temperature. Reduce production costs and energy consumption.
─ Author: Mr. Chen Chih-stringAbout Everwide § Electrical Laboratory
In order to open up the electrical industry market, setting up an electrical laboratory is our expected goal this year. Last year, we conducted a series of pre-purchasing consultations, overall planning of the placement area, detailed confirmation, risk assessment, etc. The grounding line will be buried in May of this year (Figure 1). In early July, the instrument entered the factory (Figure 2). With the assistance of the equipment manufacturer, our hardware equipment is about to be installed (Figure 3). Instrument introduction and application teaching (Figure 4) are also held. The electrical properties of polymer materials, including AC and DC breakdown voltage, arc characteristics, surface resistance, volume resistance, dielectric constant, relative tracking index, etc., are all relatively unfamiliar areas, especially certain parameters and The relationship between temperature, voltage and time is waiting for us to explore. Purchasing an instrument is the first step, and then it depends on our own efforts: we hope that we will learn deeply and go far, and share the new knowledge we have discovered with everyone, so that everyone can make progress together.
Knowledge exchange § Is there any inhibitor for epoxy resin?
When both the epoxy resin and the hardener are homogeneous, a chemical reaction occurs. For example, if epoxy resin and amine hardener are mixed together, the chemical reaction will proceed. When the reaction speed is not fast enough, an accelerator can be added to reduce the activation energy of the reaction and make the reaction speed faster. Certain chemical substances can affect the catalytic mechanism and slow down the reaction between epoxy groups and amines, but it does not change the reaction mechanism. For example, in a system that uses phenols to catalyze epoxy resins and amine hardeners, adding ketones and esters will slow the reaction, but will not stop the reaction of epoxy and amines, so epoxy resin There is no such thing as an inhibitor (Inhibitor).
Bi-weekly strike § Why do you perceive the world differently from mine?
I was on a business trip to the mainland a while ago. I wanted to learn about the latest situation in Hong Kong’s anti-transmission. The mainland Internet couldn’t find any news reports. I finally found one or two commentary articles, but they all downplayed it, alluding to the influence of certain political forces. Caused riots and riots on the island. Interestingly, many mainland friends think so. At the same time, on the Taiwan side, the most lively topic is the party primary election. Different media with clear stances often have completely different interpretations and reports on the same incident. The difference in information makes some diehard supporters only willing to immerse themselves in the media messages they believe in. Some philosophical theories believe that facts are constructed, and your thoughts determine your truth. The media provides us with information, and information constructs the facts we recognize. The viewers who have learned about Trump's policies from FOX TV for a long time and received messages from CCTV and Al Jazeera must have a world of difference. Readers who support the Liberty Times and China Times have very different views on domestic political information. At the same time, there are various media with different positions, symbolizing the precious freedom of speech and press. However, if the media with a clear stand tries to take readers or listeners to extremes, it is the beginning of tearing apart the group. This is the case in international relations, the domestic atmosphere, and the same in group organizations. This is something worth thinking about. There was a course called "Media Literacy" as a student. The purpose of this course is to train students to have the basic ability to recognize and recognize media, and to interpret and read information. The complexity of the current media types and the deep involvement of various commercial and political forces is beyond the imagination of previous scholars. This world is full of true and false and information has been packaged by benefits. If we can develop our own way of interpreting and judging information, perhaps the world can be more peaceful.
─ Author: Mr. Shi Wen-chao
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