Everwide Newsletter
Everwide Newsletter No.320

Experiment report § First experience with polysulfide rubber

We are currently committed to the development of liquid polysulfide rubber products. Compared with general epoxy resin and moisture-curing silicone, this material has a better effect on rubber bonding (Figure 1). Polysulfide rubber contains sulfur atoms in the main chain, so this kind of rubber products have good oil resistance, solvent resistance, aging resistance, low air permeability and good low-temperature flexibility. It also has a lot of resistance to certain metals (such as copper). Good bonding effect can be used for low-stress applications (Figure 2, 3). This material is commonly used in civil construction, automobile fuel tanks or aerospace industry... and other applications, especially as a gap filler material. The only disadvantage of polysulfide rubber is that it has a strange smell of sulfur, which is less pleasing. At present, we have developed a two-component formula, A:B=10:1. In the future, it can be made into a moisture-hardened single-component type. Expanding our Silicone and MS product lines, customers can have more choices based on different characteristics (Figure 4).

─ Author: Dan Gengchang, Mr. Shen Jing Jie
About Everwide § Recent people and events

The new crown pneumonia epidemic is expanding globally. In order to prevent the spread of the virus, the nurses in the factory are specially invited to carry out epidemic prevention measures. In addition to reminding everyone to measure their body temperature, it is also important to wash your hands frequently, as well as the correct way to wear masks... etc., so that the virus can "Get Out" (Figure 1). The new batch of interns have been arranged for internships in different departments. I hope that after six months of Everwide's life, everyone will be able to create different sparks. This is also a good opportunity to learn from each other (Figure 2)! In order to promote the exchange of knowledge among R&D colleagues, we have promoted "R&D short talks" (Figure 3). The speaker used 15-20 minutes to share the key analysis of the experiment, the key knowledge of the development of the product, and the link channel to search for professional data. Unlike the two-hour course, which has been running for a long time on Wednesday night, the "R&D short lecture" emphasizes fast food, immediate availability, and increases the chance of collision of knowledge. In the trend of change, the content and methods of learning, and the purposes of learning have become increasingly diverse, and we will continue to try.

Knowledge exchange § Why is the reaction speed of soft epoxy resin slow?

The general epoxy resin epoxy group is attached to the aromatic structure, and the reactivity is relatively high and the structure is relatively hard. Soft epoxy resins are often added with aliphatic epoxy resins, and epoxy groups are attached to the aliphatic structure, and the reactivity is relatively low, which is one of the reasons for the slowdown. Another reason for the slowdown is the concentration of functional groups. The material has a soft structure, large molecular weight, and low bridging density to show its softness. The concentration of functional groups in this formula is relatively low, and there is less chance of collision and reaction, so the reaction speed will be slower. The reaction rate of soft resin is slow, and the reaction rate at room temperature is more unstable. After long-term storage, the reaction rate will increase further, and it seems to have a tendency to become hard. If it can be hardened by heating, this uncertainty may be avoided.

Biweekly good shots § Recalling the fun of reading Scripture< br />
Participated in the parent-child Bible reading class for more than three years. Every Friday is the family Bible reading night. The reason for joining was very simple. One day when she took her child to the noodle stall, the lady boss said that the child was too "closed". When I think about it, it is true, because I stay at home during holidays, and my child and I lack interaction and common topics, so I decided to find out. Every child in the reading class is full of self-confidence. Among them, a fourth-grade girl typhoon steadily led the reading, coupled with the wonderful and graceful fan dance performances, I am quite impressed by the movement. The joyful atmosphere during the class completely subverts the monotonous and dull impression of the Bible reading class. It turns out that the reading can be lively and interesting. Children will also actively want to participate. In order to grow up and set a good example, we have been participating. After attending a few sessions, apart from getting to know the children better, the relationship has become harmonious. I have heard feedback from neighbors, relatives and friends, "Your child is good at taking care of our children!", "Your child is so enthusiastic!" I never thought that my child has learned to take care of others since he was taken care of. I am very pleased. Seeing the transformation of the children, I also began to take on the duties of the Bible reading class, although it was hard work, I felt happy. "The road is not afraid of the long way." Last year, we took children who had never gone abroad to Malaysia to communicate with the local Chinese Bible study class. We benefited a lot from this journey and realized the importance of promoting culture and taking root in moral education since childhood. We look forward to your participation in this grand event, and you are welcome to increase your knowledge!
─ Author: Mr. Lin Cheng Hong

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