1 Introduction As a kind of light-emitting device with small power, long service life and low energy loss, LED has been in the country for nearly 20 years. Due to its special performance superiority, it is gradually replacing the original light-emitting device and used in industry. And all corners of the civilian use. Especially with the shortage of human energy, the market prospects are very impressive. In recent years, LEDs have become more and more widely used in urban lighting engineering, industrial and civil construction industries. (According to the Central News Network, the lighting project on the Shanghai Oriental Pearl TV Tower has recently been replaced by LED display, which not only saves energy but also enhances the aesthetics.) It is reported that the LED chip for civilian use has been successfully developed abroad, and it is expected that in the near future, Your home décor will also be illuminated with LEDs. 2 Overview At present, there are more and more domestic LED manufacturers, mainly in the mid-range products accounted for nearly 50% of the market, about 40% of the high-end market is still occupied by foreign companies, which are mainly Hong Kong businessmen and Taiwanese businessmen. It can be seen that the market prospect of LED is still very impressive. At the same time, it provides opportunities for the development of domestic supporting materials manufacturers, such as chips, epoxy resin packaging materials, mold strips (die), brackets and so on. At present, about 50% of the epoxy resin packaging materials are imported, mainly in the high-end market. Like Haisuo, Chuanyu, Lishang, EPFINE, etc., basically occupy the high-end market. Domestically, Shaohui Group produced LED epoxy resin encapsulants earlier. In recent years, there have been production companies such as Shunde ACR, Changsha Lanxing, Jiangyin Tianxing, etc., but domestic enterprises basically maintain the production of lower grade packaging materials, and the output is also Smaller, higher-end products still have a long way to go. The market welcomes powerful domestic companies and research institutions to develop and produce high-grade epoxy materials. I have been engaged in epoxy resin research for many years. Now I have provided my research results in packaging materials, and I hope to play a role in the industry, and contribute to the development of domestic LED. First, the choice of materials for the main agent 1 Epoxy resin: It is based on the principle of transparent colorless, low impurity content and low viscosity. Such as Daojing's 331J, South Asia's 127, Japan's Mitsui's 139, and Dainippon's EP4000 are all applicable, and the medium and low-end market adopts Hongchang's 127. 2 Reactive diluent: Generally, it is better to use alicyclic double-compartment reactive diluent, but it can't be produced in China, or the unit price is too high. Special occasions can be replaced by South Asia AGE, but AGE has strength after curing. Impact, cross-linking is not enough. If the viscosity of the resin is low, it is also possible to choose not to add a diluent. 3 Defoamer: It has good compatibility, good defoaming property and no low boiling point solvent. Such as BYK-A530, BYK-066, BYK-141, Deqian 6500, etc. can be used. 4 Toner: Generally, 80% of the main epoxy resin is added with 20% transparent oil-containing dye. After heating and stirring, it can be added in a small amount, which can eliminate the yellowish color caused by the addition of resin and other materials. Guarantee the purity of the color after curing. Note that the selection of transparent oil-based dyes requires a temperature resistance of at least 150-180 degrees to prevent discoloration during warming and curing. Such as Bayer PEG-400. 5 Release agent: It has good release effect, good compatibility and light color. For example, FINT-900 of Guangzhou Kolasi Company (BYK agent) and TMA release agent of Wuxi Sanshan Electronic Material Factory can be used. The amount of addition varies depending on the material. The release agent may be added to the main agent or may be added to the curing agent. Second, the material selection of curing agent 1 Methylhexahydrophthalic anhydride is produced in Jiaxing Alpha Fine Chemicals and Henan Fuyang Huicheng Fine Chemicals, but the general free anhydride content is high, and it is only used for the production of medium and low-end products. Higher requirements use the products of the Italian LONZA company. 2 Promoters Many domestic manufacturers waste a lot of time in this regard. In fact, it is still feasible to use quaternary ammonium salts in the acid anhydride system, such as the tetrabutyl bromide tetrahexyl bromide in Zhejiang Jintan Chemical Research Institute, but the latter is compatible. The sex may not be very good, it can be diluted with alcohol such as benzyl alcohol and glycerin. But it will affect the intensity. So the former is better. 3 Antioxidants mainly prevent oxidation of acids when they are cured at high temperatures. Requires good compatibility, light color, and versatile 264 can also be used when the requirements are not high. Third, the formula example: (The following formula is for reference only, I do not bear any responsibility) Main agent: R-139 96.6 Curing agent: methyl hexahydrophthalic anhydride 95.54 AGE 3 tetrabutylammonium bromide 1.4 Blue dye paste 0.3 264 antioxidant 1.5 BYK-A530 0.05 glycerin 1.5 FIN release agent 0.05 blue dye paste 0.01 Total 100 parts total 100 parts Matching ratio: 100/100 Four production processes Because the synthesis reaction is not involved, the production process is relatively simple, generally heating to below 80 degrees, stirring for about one hour, cooling and discharging. However, attention should be paid to the order in which the materials are added, such as solid materials, which are firstly added with a liquid material and then dissolved in order. 3 Conclusion The LED potting and sealing material market is dominated by the Pearl River Delta, and the coastal areas including Fujian, Zhejiang, Shanghai and Jiangsu are all very large. In the past few years, the market has developed rapidly. For example, Hunan, Hubei, Jiangxi, and Tianjin have gathered many LED manufacturers. For example, Zhongshan Mulinsen monthly material is about 30 tons, Zhaoqing Lide month is used for about 20 tons, and Dongguan Lizhou monthly consumption is about 15 tons. It is estimated that the domestic market for the entire luminous tube is about 500 tons per month. In summary, there is still a big gap in the domestic epoxy resin processing enterprises to complete the market to replace imports. On the one hand, it depends on the supply of related raw materials in China, and how to improve the product grade from the technical aspects. Application of product occasions.
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