“Plastic aluminum” is attracting attention? LED heat dissipation material new direction

If the heat dissipation problem is not solved, it will directly affect the performance of the lamp bead, thereby shortening the life of the finished lamp. The best heat dissipation is metal such as copper, aluminum, iron, etc., especially aluminum is the most popular, because aluminum is not only lightweight, but also has good thermal conductivity. However, the price of aluminum is relatively expensive, the cost is relatively high, and it is limited by the process, resulting in fewer styles. Secondly, plastics are widely used. The insulation and heat dissipation properties of plastics are relatively good, and the price is relatively low. However, the thermal conductivity is worse than that of metals, and the appearance of the products is rough and the appearance is not high.

After comprehensively measuring the advantages and disadvantages of aluminum and plastics, material manufacturers have developed and introduced a new type of "plastic coated aluminum" heat sink material. The outer layer of the heat dissipating material is made of high thermal conductive plastic, and the inner layer is made of aluminum, which fully considers and combines the advantages of plastic and aluminum. At the same time, this "plastic aluminum" heat-dissipating material is cheaper and can be recycled than aluminum. Because of the plastic insulation performance, the “plastic aluminum” heat-dissipating material can pass the safety certification, improve the safety performance, and support non-isolated power supply or even linear IC drive, which directly affects the technical research and development in the power supply field.

Of course, the "plastic aluminum" heat sink material is not perfect, the biggest problem is the compatibility of plastic and aluminum. Because the thermal conductivity is inconsistent, will it cause the cooling kit to fall off? In terms of high-power LED lamps, can “plastic aluminum” meet its heat dissipation requirements? Because of the secondary recycling, how much does the recycled material reduce in performance? Manufacturers of “plastic aluminum” heat dissipation materials are required to further standardize and upgrade.

Multi-party hot discussion: "plastic aluminum" is difficult to become the first choice for lighting materials

Because the LED light conversion efficiency is insufficient, heat is generated when the light is emitted, thereby reducing the life of the LED lamp and increasing the light decay speed, so the LED lamp must consider heat dissipation in the application.

Today's LED lamps are driven by a low-voltage constant-current power supply. Some electronic components will be depleted at high temperatures, and the electrolyte in the capacitors will easily dry out, affecting the life of LED lamps. In order to reduce costs, some LED lamp housing manufacturers have iron powder in die-cast aluminum, which affects the heat dissipation characteristics of the metal.

As a new type of heat dissipation material, “plastic aluminum” is currently used by some manufacturers. However, metals and non-metals cannot be combined under normal conditions, and some plastics do have good thermal conductivity, but plastic materials that can conduct heat are currently exceeding the standard. Plastic materials have good insulation and can be matched with non-isolated power supplies. From a safety point of view, it has certain advantages.

I have seen some aluminum-clad LED lamps in the market. I also saw cases of shell melting during use. Because there is no flame retardant added to the plastic material of plastic-clad aluminum, some properties of plastic recycling and processing will decrease. And not environmentally friendly. I think plastic aluminum will not be the general trend of heat dissipation materials for LED lamps in the future, because the light conversion efficiency of the chip is increasing, and the heat energy emitted by the illuminator is negligible.

Plastic aluminum will be favored by LED bulb companies

LED heat dissipation is still a problem that needs to be solved in the lighting industry. The current heat dissipation area is only suitable for 15-20W bulbs. For high-power plastic aluminum, further development is needed. The advantage of plastic coated aluminum is that its outer layer is made of high thermal conductivity plastic, and the inner layer is made of aluminum. It fully considers and combines the advantages of plastic and aluminum, so it is favored by many enterprises. However, due to the characteristics of the plastic, there is a limitation on the temperature. In ordinary bulbs, the volume and space are limited. The larger the volume of the plastic-coated aluminum, the higher the cost. In the case of a small order quantity, The profit is very thin. I believe that plastic coated aluminum will be favored by LED bulb companies in the next three years.

In the aspect of high-power LED lamps, the application of plastic-coated aluminum is relatively small, because the melting point of plastic heat-dissipation is much different from that of aluminum. If applied to high-power LED lamps, it must be protected by PPT plastic aluminum, and the bonding of PPT plastic aluminum. The performance is higher than the general plastic coated aluminum, and the melting point is also between 200 ° C, which can provide safety for the heat dissipation of high-power LED lamps.

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