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Everwide Newsletter No.155

Updated: Sep 23, 2021

Experiment § High-strength adhesive with low heat release

Everwide Chemical has been researching epoxy adhesives for a long time, and constantly develops them in response to customer needs. The recent new product is a low-heat release one-liquid adhesive. The one-component resin does not react at low temperatures but will react quickly and release the heat of reaction when the temperature is above a certain temperature. In the case where the colloid is very thin, the reaction exotherm is easily dissipated, and there is no obvious effect. However, when the colloid is very thick, the heat released by the reaction is very concentrated, and the total heat is very large. It may even cause the decomposition of the material, resulting in many voids inside the cured product (Figure 1 front view, Figure 2 cross-sectional view). It may also cause deformation of the attached workpiece (Figure 3, melting and distortion on the left. The normal shape on the right). These affect the strength or performance of the product, so an adhesive with low heat release is required. Many methods to reduce the amount of heat, such as reducing the amount of catalyst, changing the type of curing agent, or adding inorganic powder. It often leads to a serious decrease in adhesion. We worked hard to achieve technological breakthroughs, as shown in Figure 4 and the table: Under the premise of the same reaction conditions, the heat release was greatly reduced by 38%, and adhesion was only lost by 7%.

─Author: Miss. Li-Lin, Liu


Activity § Congratulations! Pass the TTQS assessment threshold!

Everwide has been systematically arranging employee education and training for five consecutive years and has applied to the Labor Committee for a rechargeable take-off plan for three consecutive years to subsidize our training funds. Due to the application for this program, we must accept the assessment of TTQS and use this score as the basis for the subsidy ratio. In 2011, we accepted the assessment for the first time. At that time, we were not clear about the required indicators, and the results without preparation were not satisfactory. (For the content of TTQS, please refer to the 149 e-newsletters This year, we sent a total of 26 people to participate in TTQS related courses, fully understand its provisions and structure, and formed a training team to plan and arrange education and training throughout the year. In the absence of consultants entering the factory for guidance, we organize the existing results ourselves and pass the threshold of this year's assessment. This result is a great encouragement to us. We must continue to work hard and hope to get a silver medal or more in 2 years. (Figure 5 and 6 are the actual situation of the TTQS assessment process, and Fig. 7 is the certificate of passing the threshold.)


Knowledge § What is the principle of defoamer?

The reason why the bubbles will not break in the resin is that there are some foam-stabilizing substances in the resin, which increase the strength of the liquid film and cause the bubbles to be difficult to burst. Most defoamers are substances with very low surface tension, which are easy to float on the surface of the liquid and spread out. The substance that absorbs the foam helps to destroy the interface, and the liquid film of the bubble becomes thinner locally, causing the bubble to burst. Since the role of the defoamer occurs on the surface of the liquid, the compatibility of the defoamer and the liquid is the key to the defoaming performance. When the compatibility of the defoamer and the liquid is good, the defoamer will not easily run to the surface of the liquid, so the defoaming performance is not good. Systems with poor compatibility will have better defoaming properties, but they may cause surface defects, oily surfaces, and difficulty in coating after the resin is cured. The principle of defoaming is very simple, but it takes a lot of experimentation to choose an appropriate defoaming agent.


Living § This is good enough!

Jessie has a moderate grade in the class, is lively, outgoing, and very righteous, so she is an excellent young lady in the eyes of her classmates. In school, I never saw Jessie’s pressure on entering higher education. After class, she always participates in the group practice of the guitar club or the basketball school team. Every time the test results came out, she always said, "75 points! That's okay! I originally thought I could only take 70 points, which is good enough!" "That's good enough!" is Jessie's usual catchphrase. In the 500-ball practice shot in the school team, she always stopped at 300, and then said to the coach: "This amount of training is good enough!" In her senior year in high school, she changed from the main player to a bench player. Jessie didn't understand and ran to the coach and asked why she was not a starter? The coach said, "That's good enough! You throw 300 balls every day, and everyone else has thrown 500 balls. What else can you ask for?" And Jessie also suffered from too many foreign affairs, her homework has been regressing, and she failed to get admitted to the ideal school. In our lives, many of them heard the same voice, "this is good enough!" This kind of voice sometimes comes from the heart of the self, and sometimes it comes from the relatives and friends around me, like comfort and encouragement. Such a statement easily makes people fall into a kind of myth, thinking that they are really good enough, so they stop and don't continue to try to see if they can break through the limit. In fact, many great achievements in history consisted of working a little bit more on the original limit, and so did our own small lives. "This is good enough!" When it is a sign of success, we must seize the opportunity to make a breakthrough and encourage friends around us. A little more is the climax of life.

—Author: Miss. Heng-Rong, Li


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