To solve these existing problems, it is recommended that street lamp manufacturers start from basic materials and solve the problem of high-power LED heat sources from the inside out. For example, in the bonding of light-emitting components and aluminum substrates, thermally conductive adhesives play a key role. Some manufacturers think that the thermal conductivity of thermally conductive films or thermally conductive pads is better, and the film thickness should be as thick as possible, but they did not think about thermal resistance. No matter how good the thermal conductivity is, the thermal resistance of the film thickness is useless. What's more, the thermally conductive adhesive film or soft thermally conductive gasket cannot really adhere to the substrate, and there are actually many pores on the bonding surface. These pores look like hollow air pockets when viewed under an electron microscope, which is another form of thermal resistance. With so many thermal resistances that interfere with heat conduction, the efficiency of heat dissipation and heat conduction is virtually reduced.
If the thermal resistance is low, it is necessary to use the thermal conductive adhesive. The soft ceramic thermal conductive adhesive for screen printing is recommended. The soft ceramic thermal conductive adhesive for screen printing construction is different from the traditional laminating thermal conductive adhesive film. The soft ceramic thermal conductive adhesive is soft and semi-liquid. When the screen printer squeegee is applied to the aluminum substrate, the thermal conductive particles will penetrate into the pores on the substrate surface. I fill it up. In this way, a completely flat surface with no pores will be formed, and it will be completely adhered to the LED epitaxial substrate. In this way, the thermal resistance is reduced to a minimum, and the heat can be quickly conducted out, which naturally reduces the ambient temperature of the LED die, prolongs the life of the epitaxy and greatly delays the occurrence of light decay. In addition, due to the ductility of the soft ceramic thermal conductive paint for screen printing construction, it will change with the thermal expansion and contraction of the aluminum substrate during high-temperature baking or reflow. The stress is very small, and it will not cause the aluminum substrate to warp or warp. Will burst.
It is recommended to use soft ceramic heat-dissipating paint for LED lamps for the external protection of LED lamps. This kind of sprayed soft ceramic heat dissipation paint can be directly sprayed on the outside of LED lamps, construction and operation are simple, can be adapted to various shapes of heat dissipation structures, and can also be adjusted to different colors to meet the needs of landscape design. The soft ceramic particles in the sprayed heat dissipation paint are nano-processed. The fine particles are not only easy to operate with the spray gun, but also make the heat conductive particles on the same coated area more and more dense, and the area where the temperature evaporates is also enlarged. Let the heat of the LED lamps be quickly conducted out. The soft ceramic heat-dissipating paint is a thermosetting material that complies with RoHS environmental safety regulations. The construction procedure is simple and does not require any special equipment. After baking, it is thermoset and can withstand the high temperature of the LED for a long time without qualitative changes. LED street lights, LED landscape lights, or LED advertising billboards used outdoors will also face acid and alkali damage such as wind and rain, acid rain, bird droppings, air dust, black smoke emission hELlip; and so on. Therefore, this kind of spraying soft ceramic heat dissipation paint must have the characteristics of acid and alkali resistance, and the range of pH resistance is between PH3~11, which can effectively protect the appearance of LED outdoor lamps from corrosion.
The cost structure of LED lamps is constantly improving with the development of packaging technology, carrier board design, and heat dissipation module structure, and the cost is also decreasing with technological development and market demand. However, not many manufacturers have invested in material improvement. This is mainly related to the history and habits of Taiwan's industrial and commercial development. Taiwanese manufacturers are good at manufacturing process and design, and they pay less attention to material basic research and development. Therefore, when it comes to solving technical problems or reducing costs, it is more inclined to purchase thinking or production management thinking. However, at the first point in time, U.S. and Japanese manufacturers will think about the application of materials and reduce costs, improve quality and increase profits from an innovative perspective.
