Application of potting silica gel in power supply industry |
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| Reading Volume： 【 1634 】 | Time： 【 2017-10-11 】 | |
| With the continuous development of modern science and technology and increasing market demand, the market has higher requirements for the stability of electrical appliances, and its heat dissipation performance has become the key to the miniaturization of the whole machine. The improvement of electrical power requires potting materials to have significant heat dissipation and insulation properties at the same time. If the heat dissipation cannot be conducted in time, it is easy to cause high temperature of some parts, which may damage the equipment, and then affect the reliability of the diversion and the normal working time. According to relevant documents, every time the temperature of electronic components rises by 2°C, the reliability of the product drops by 10%; when the temperature rises to 50°C, the life span is only 1/6 of that when the temperature rises to 25°C. Silicone rubber has become the first choice for power potting base glue due to its excellent physical and chemical properties and process performance. Adding high thermal conductivity fillers can obtain thermally conductive and insulating potting liquid silicone rubber. Now that the technology continues to mature, the heat-conducting liquid silicone rubber is playing an increasingly important role in the protection of equipment, especially in the protection of high-voltage and high-power components. Silicone rubber can maintain elasticity at -60～200℃ for a long time, does not absorb heat, does not emit heat, does not shorten after curing, has good adhesion to materials, and has excellent electrical and chemical stability properties, water resistance, It is resistant to ozone and weathering. After being potted with LED products, it can play the role of moisture-proof, anti-corrosion, shock-proof and dust-proof, and stabilize component parameters. Silicone rubber can be divided into two types, one-component and two-component according to the different components. The most common thermally conductive silicone rubber is two-component, composed of components A and B, which can be divided into two types according to the chemical reaction mechanism. Addition molding and condensation type two types of silicone rubber, the addition molding product can be deep potting and there is no low molecular substance during the vulcanization process, the shortening rate is low, and the adhesion to the component or the potting cavity wall is low. One-component thermally conductive silicone rubber also includes condensation type and addition molding. Condensed products generally have good adhesion to the substrate, but are only suitable for shallow potting. One-component addition molding thermally conductive silicone rubber is generally required Low temperature storage, the glue will need to be heated and vulcanized in the future. The most important feature of thermally conductive potting silicone rubber is that the product can be modified. When electrical/electronic equipment is produced, it is expected that the discarded or damaged product can be recycled. Without causing great damage to the internal circuit, it is difficult or impossible to remove the non-silicone rigid potting/sealing materials and inject them from the head. The use of silicone potting glue can conveniently carry out selective removal, correction or complete replacement, and pouring new potting glue at the corrected part from the beginning. When removing the silicone elastomer, you can simply use a sharp blade or knife to tear or remove the unnecessary data from the area to be corrected. For the elastic body adhering to the part, it is best to use mechanical means such as scraping or collision to remove it from the substrate or circuit, and you can use silicone oil as an auxiliary agent. In the past when pouring sealant on the modified equipment from scratch, it was necessary to use sandpaper to roughen the surface of the cured sealant, and then wipe it with an appropriate solvent. This helps to strengthen the bonding force and integrate the revised data with the existing potting and cementing. It is not suitable to use silicone primer as the adhesive of the product itself. | ||
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