A kind of preparation method of polycarbonate resin fluorescent composite material and fluorescent LED lampshade

Abstract

Disclosed is a polycarbonate resin composite fluorescent LED lampshade production method, aiming to overcome defects that conventional LED lampshades are low in lighting effect and low in color rendering property. The production method includes preparing a polycarbonate resin fluorescent composite material from polycarbonate resin, YAG fluorescence powder, phosphate flame retardant, antioxidant, compatilizer, coloring agents and additives according to a certain proportion through specific technology, and then heating, extruding, molding and cooling the polycarbonate resin fluorescent composite material by an injection molding machine so as to form polycarbonate resin composite fluorescent LED lampshades. The polycarbonate resin composite fluorescent LED lampshades can prolong service lives of LED, improve energy efficiency utilization, reduce light diffusion and lower temperature of chips and enable heat sinks to be smaller, so that the LEDs can emit high light with low energy consumption, and energy efficiency is improved.

Description

technical field [0001] The invention relates to an LED lampshade, in particular to a method for manufacturing a polycarbonate resin composite fluorescent material and using the polycarbonate resin composite fluorescent material to manufacture an LED lampshade. Background technique [0002] In 1990, Japanese scientist Nakamura Shuji invented the blue LED, which laid the foundation for the development of white LED. The white LED successfully developed in 1998 was made by packaging the blue GaN chip and yttrium aluminum garnet (YAG) phosphor together. The blue LED substrate is installed in a bowl-shaped reflective cavity and covered with a thin layer of epoxy resin coated with YAG. Part of the blue light emitted by the LED substrate is absorbed by the phosphor, and the other part of the blue light is mixed with the yellow light emitted by the phosphor to obtain high brightness. white light. This method of obtaining white light through blue LED+yellow fluorescent powder has man...

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Problems solved by technology

This method of obtaining white light through blue LED+yellow fluorescent powder has many defects after several years of use: 1. The high heat of the electrode makes the heating function of the fluorescent powder close to the electrode rapidly attenuate, and the light efficiency is reduced; 2. 1. LED light is directional, the light angle is narrow, and it is not easy to diverge. After expanding the irradiation surface by various methods, the power consumption and cost will increase geometrically; 3. The current epoxy resin packaging process equipment for white LEDs is too professional , the investment is huge, and the refurbishment is too fast, which leads to a serious waste of equipment resources (for example, more than 50% of the packaging factories in Shenzhen have closed down); 4. There is a lack of red wavelengths in the light. At present, LEDs cannot achieve below 3000K, and there are too many blue wavelengths in the light. , dazzling and eye fatigue (currently a big controversy); 5. The color rendering is not high, which cannot reach the level above Ra94; 6. With the increase of power, the problem of LED heat dissipation becomes more and more prominent, and LEDs will emit a lot of light during work. The heat will cause the junction temperature of the tube core to rise rapidly, cause the epoxy resin in the package to yellow, and the function of the chip will attenuate, which seriously affects the photoelectric parameters of the LED (at present, the LED only has T4\T5 straight tubes below 15W and low-power light sources of 1-7W. Can compete with fluorescent lamps, and the cost is 5-10 times that of fluorescent lamps)

[0003] At present, the preparation of lampshades for blue LEDs mostly adopts methods such as electrostatic spraying in glass or PC covers. It achieves the purpose of improving light transmittance and eliminating glare, but it is difficult to achieve the maximum degree of uniformity when phosphor powder is only coated on the surface of the lampshade. The process requirements are high and the yield is low. use of the product

The blue LED lampshade made by this method has high requirements on the particle size of the phosphor powder of the blue LED lampshade, the compound ratio, time, temperature and other factors. The size and other aspects can not meet the requirements of the blue LED fluorescent lampshade

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