Recently, according to experts from China Epoxy Resin Industry Association, LED epoxy resin packaging technology was introduced. The expert first stated that the epoxy used in the LED production process is one of the key points in the LED industry. Epoxy resin is a kind of organic polymer compound which contains two or more epoxy groups in a molecule, and their relative molecular qualities are not high except for a few. The molecular structure of the epoxy resin is characterized by the presence of an active epoxy group in the molecular chain, and the epoxy group may be located at the end, in the middle or in a ring structure of the molecular chain. Since the molecular structure contains an active epoxy group, they can be cross-linked with various types of curing agents to form an insoluble, infusible polymer having a three-dimensional network structure. Led ic, etc., in order to maintain its own airtightness, protect the die from external corrosion, prevent moisture from entering the outside, mechanically support the wires, effectively discharge the heat generated inside, and prevent the electronic components from being mechanically vibrated. The impact is damaged, resulting in changes in the characteristics of the component, using different shapes and material properties (with or without a colorant), functioning as a lens or a diffusing lens to provide a hand-held body.
Led hardening temperature and time with sealant resin is a very important topic. The main points include the following aspects: Generally, the sealing resin hardener for LED is an acid anhydride, and the hardening temperature is about 120-130 ° C; the hardening time is shortened after the accelerator is added. Regarding the hardening time and the phenomenon of hardening and hardening, the expert further stated that the thermal conductivity of the resin is small, the internal hardening heat accumulation affects the hardening rate (reaction rate), and the inner (hardening heat) outside (oven) high heat disply case is easily deformed. . The expert said that one must pay attention to another point - the blending ratio and characteristics of the resin and hardener: the amount of hardener used depends on the required properties; when the blending ratio of the hardener is small, the hardness of the hardened material is hard and yellow; When the compounding ratio is large, the cured product becomes brittle and the coloring is small. For tg - glass transfer point - and hdt (heat distortion temperature), the experts continue to introduce three technical points - test method: tma, dsc.b: the temperature difference between the two is 2 ~ 3 ° C; add filler After tg becomes higher; the electrical properties of the epoxy resin (insulation resistance rate and loss rate of induced electric loss) are lower than the heat distortion temperature.
The epoxy resin used for constituting the envelope must have moisture resistance, insulation, and mechanical strength, and has a high refractive index and transmittance for light emitted from the LED. The choice of packaging materials with different refractive indices, the influence of package geometry on photon and escape efficiency is different. The angular division of luminous intensity is also related to the structure of the die, the way of light output, and the material and shape of the package lens. If a pointed resin lens is used, the light can be concentrated to the axial direction of the LED, and the corresponding viewing angle is small; if the resin lens at the top is circular or planar, the corresponding viewing angle will increase. As a kind of light-emitting device with small power, long service life and low energy loss, LED has been in the country for 20 years. Due to its special performance superiority, it is gradually replacing the original light-emitting device and used in industrial and civil use. All corners. Especially with the shortage of human energy, the market prospects are very impressive. In recent years, LED has become more and more widely used in urban lighting engineering, industrial, and civil construction industries. According to the CCTV news broadcast, recently the Shanghai Oriental Pearl TV Tower, the lighting project was replaced by a led display, which not only saves energy but also enhances the aesthetics. Experts said that the domestic LED chip has been successfully developed abroad, and it is expected that in the near future, home decoration will also be illuminated by LEDs.
(Editor: Zeng Cong)
Product application:
1 AC air switch
2 AC contactor
3 Mechanical switch and electronic switch
4 Cable and wire
5 Automatic detection and calibration platform
6 Large current capacitor electrical appliances
7 Thermal relay, molded case circuit breaker, small circuit breaker and the required rated current, action current, short-circuit protection current, etc
Technic parameter:
constant current source
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