In recent years, with people's attention to air pollution and the continuous progress of science and technology, the new energy electric vehicle industry has achieved great development. In 2018, the sales volume of domestic new-energy passenger vehicles has exceeded one million, with new-energy electric vehicles accounting for the vast majority, with nearly one million units.
(New energy electric vehicles)
(New energy vehicle market conditions)
Compared with traditional fuel vehicles, the biggest difference of new-energy electric vehicles is the replacement of traditional driving devices such as fuel engines and gearboxes by batteries, motors, and energy conversion systems. It has zero emissions, high kinetic energy conversion efficiency (oil and electricity), low noise, and other advantages.
(New energy electric vehicle driving system)
However, the development of new technologies has not been smooth sailing. New technical problems will come with the switch from traditional fuel-powered cars, including the heat conduction needed to keep the batteries, chargers, and driving motors in normal operation.
When the new energy electric vehicle is running at high speed, the electronic components of the charger and the drive motor system will generate great heat. If the temperature is not controlled, the reliability and stability of the parts will be greatly affected, and even the safety risks will be caused. Therefore, only by selecting a kind of multifunctional thermal conductive material with excellent performance can the new-energy electric vehicle really run.
After the screening test by researchers and engineers, silicone thermal conductive sealant stands out as the best choice among many thermal conductive materials The main reason is that silicone potting sealant has excellent high and low-temperature resistance and can maintain long-term stable operation at -60 ~ 200℃; moreover, the silicone sealant is soft and has good shock absorption effect, which is also easy to maintain. In addition, silicone potting sealant has good insulation performance and can protect electronic devices.
It is with many excellent characteristics that silicone potting sealant has been widely used in the new energy electric vehicle industry.
However, when marveling at the magical functions of silicone thermal-conducting potting sealants, the fact is that these special functions are not possessed by silicone potting sealants by nature, but by the addition of some functional filler. Among them, fumed silica plays an irreplaceable role as an important filler of silicone sealant.
Fumed silica (commonly known as gas-phase silica white carbon black) is an extremely important nano-level inorganic raw material with small particle size, large specific surface area, good dispersion, strong surface adsorption, and excellent reinforcing, high resistance, low-temperature resistance, thickening and thixotropy, settlement proof, insulation, stability, and other characteristics.
The rapid settlement of thermally conductive filler in silicone potting can be effectively prevented by adding the surface treated hydrophobic fumed silica, which also can greatly improve the strength, high and low-temperature resistance, stability, and toughness, and has the effect of defoaming. The addition of fumed silica not only improves the various properties of silicone potting sealant but also greatly improves the process production efficiency and yield of silicone potting sealant, far exceeding the role of lithium bentonite, organic gel, carbon black and other fillers.
In new energy vehicles, organic silicon potting sealant with fumed silica is the key to ensure its excellent thermal conductivity and extensive application in new energy vehicles.
As an important raw material and a key link in the industrial chain, fumed silica plays a vital role in the development of the silicone industry. Hyperbole aside, without fumed silica there would be no silicone rubber industry, and there would be no silicone products like silicone potting, which play a huge role in people's lives. For the organic silicon industry, fumed silica is similar to the role of "chips" in the field of integrated circuits.