Everwide newsletter No.17

In April 2008, Dr. Ming-Xu， Li, and Mrs. Wen-Chao， Shi who went to Shanghai on business brought back amazing gifts! The picture on the left is the harvest of the business trip, a total of 46 new books with a total weight of 20 kilograms. Times are changing, and so is the field of science as we know it. In order to give everyone more opportunities to acquire new knowledge, the supervisors who go to Shanghai for business always bring back many books for everyone to read and enrich their talents. We also look forward to absorbing more new scientific knowledge and developing more updated products to serve customers!

According to the general trend of harmless products in advanced countries around the world, and the environmental protection needs of environmental protection groups (such as Greenpeace) for electronic products, major companies at home and abroad have begun to phase out parts containing PVC and halogen flame retardants. The composite material with resin and rubber as the matrix contains a large number of organic compounds and has certain flammability. Flame retardants are a class of additives that prevent the ignition of polymeric materials or inhibit the propagation of flames, and the most commonly used and most important flame retardants are compounds of phosphorus, bromine, chlorine, antimony, and aluminum. Flame retardants can be divided into two categories: additive type and reactive type according to the method of use. Additive flame retardants mainly include phosphate esters, halogenated hydrocarbons and antimony oxides, etc. They are blended into the composite material during the processing of the composite material. They are easy to use and have large adaptability but have an impact on the performance of the composite material. Reactive flame retardant is made into a monomer raw material and added to the polymerization system in the process of polymer preparation so that it can be compounded to the polymer molecular chain through a chemical reaction, so it has little effect on the performance of the composite material and has long-lasting flame retardancy. Reactive flame retardants mainly include phosphorus-containing polyols and halogenated acid anhydrides. The flame retardant used in composite materials should have the following properties: ① High flame retardant efficiency, which can give composite materials good self-extinguishing or flame retardancy. ②It has good mutual compatibility, can be well compatible with composite materials, and is easy to disperse. ③ It has a suitable decomposition temperature, that is, it does not decompose at the processing temperature of the composite material, but it can rapidly decompose when the composite material is thermally decomposed to exert the effect of flame retardant. ④Non-toxic or low-toxic, no odor, no pollution, no toxic gas is generated during the flame retardant process. ⑤ When used with composite materials, the mechanical properties, electrical properties, weather resistance and thermal deformation temperature of composite materials will not be reduced. ⑥It has good durability and can be retained in composite products for a long time to exert its flame retardant effect. ⑦ Wide range of sources and low prices. (1) Brominated flame retardants Bromine-containing flame retardants include aliphatic, alicyclic, aromatic, and aromatic-aliphatic bromine-containing compounds and these flame retardants have high flame retardant efficiency. The flame-retardant effect of brominated flame retardants is twice that of chlorine-based flame retardants, and the relative dosage is small, which has little effect on the mechanical properties of composite materials and can significantly reduce the content of hydrogen halide in gas, and brominated flame retardants have good compatibility with the matrix resin, and there is no spray phenomenon even under harsh conditions. (2) Chlorine-based flame retardants are still widely used flame retardants due to their low price. Chlorinated paraffins with the highest chlorine content are industrially important flame retardants, and due to their poor thermal stability, they are only suitable for composites with processing temperatures below 200°C, because of the high thermal stability of chlorinated alicyclic hydrocarbons and tetrachloride phthalic anhydride, they are often used as flame retardants for unsaturated resins. (3) Phosphorus-based flame retardants and organic phosphide compounds are additive flame retardants. The metaphosphoric acid generated when the additive flame retardant is burned can form a stable polymer, which covers the surface of the composite material to isolate oxygen and combustibles, and plays a flame retardant role. Its flame retardant effect is better than that of bromide. If you want to achieve the same flame retardant effect, the amount of bromide is 4 to 7 times that of phosphide. Such flame retardants mainly include phosphorus (phosphonate) esters, halogen-containing phosphate esters, halogenated phosphorus, etc., and are widely used in epoxy resins, phenolic resins, polyesters, polycarbonates, polyurethanes, polyvinyl chloride, polyethylene, polypropylene, ABS, etc. (4) Inorganic flame retardants are a class of flame retardants classified according to their chemical structures, including antimony oxide, aluminum hydroxide, magnesium hydroxide, and zinc borate.

—Data provider: Business Manager Mrs. Zhu-Fang, Huang of Everwide Chemical

Some plastic structures have a large proportion of aromatics, a high LOI (Limited oxygen index) value, and a high content of char yield after combustion, which is inherently flame retardant. For example, phenolic resin, furan resin. For other plastics to achieve the flame retardant effect, flame retardants must be added. Flame retardants can be classified into halogen-based, phosphorus-based, nitrogen-based, and inorganic systems. Most of these flame retardants are additive type, and only some are reactive type, which can become part of the resin structure.

FZ028 is an emulsified acrylic pressure-sensitive adhesive. Since the molecular weight of the emulsified resin is large enough, it does not need to rely on a bridging agent, and the coating operation is very convenient. FZ028 has excellent initial adhesion and has excellent adhesion to non-superior materials such as polyethylene. The features of FZ028 are (1) Emulsifying resin has the advantage of saving energy. (2) Reduce costs. (3) The advantage of no air pollution.

The IMD seminar held in Shanghai on March 20, 2008, was attended by three people from our company and the following is the description of the visit. IMD technology is a general term that combines printing and injection molding. Due to the competition in the electronic industry, the improvement of printing quality and the progress of molding molds have produced high-quality in-mold decoration products, including mobile phones, portable electronic products, home appliances, automobile industries, etc. The production technology of IMD is also continuously researched and developed in various industries, and several key points include film acquisition, link acquisition, and injection molding mold technology. Most of the meeting was aimed at inquiries from film manufacturers and inquiries about ink flushing. Solvent-based inks have been researched in mainland China for ten years. Although some production processes have to be stopped due to ink flushing problems, various ink manufacturers will provide various methods to overcome them. Each manufacturer has more or less ink flushing problems. However, they always use the excuse that "the technologies cannot be disclosed to the public", and they do not really have a common process to solve all the problems of customers. When we exchange business cards with customers, we hope that customers can inform us about the problems related to ink in the process, and further help customers find suitable adhesives to solve the problems they face in production. During the two-day conference, we tried our best to ask relevant questions to communicate with the speakers, in order to improve the company's reputation at the conference and let some hidden traders or self-employed people know the company's understanding of UV. Thus exchanging information, I really learned a lot about the importance of communication between people, and letting others know more about the company's R&D team. Since I started working with IMD inks, I have often encountered difficulties with adhesion and gloss. After several months of tempering, coupled with the research and development of the existing extension glue, the dyeing process is smoother. The problems of extension adhesive viscosity and mesh have also gained some understanding. In terms of IMD ink, I believe that as long as I work hard, there will be results. I also hope that after participating in this seminar, I can absorb new knowledge and digest new information, so that the company can make progress in IMD ink.

—Author: R&D Engineer Ms. Miao-Ling, Lin 、Mrs. Can-Xian, Hong and Business Director Mrs. Wen-Chao, Shi of Everwide Chemical