Automotive engine control module, ignition coil and ignition module, power module and all kinds of sensors, such as the working temperature is very high, harsh environment, the automotive electronic equipment materials put forward a high demand. Conductive material for its excellent thermal conductivity, thermal stability, oxidation resistance, moisture resistance, easy adhesion and low stress, widely used in conductive adhesive / sealant, sealant, thermal conduction, thermal interface materials, conformal coatings, improve the performance of automobile electronic products.
According to statistics, the current application of all automotive innovation about 85% of electrical or electronic related, mechanical and electrical products are gradually replacing the traditional mechanical and hydraulic products. Experts predict that in the near future, the value of electronic technology in the car can account for about 40% of the value of the vehicle. At the same time, because the car caused by the fault of electrical / electronic fault rate is rising, prompting OEM and the level of the supplier by demanding reliability standards, to seek new material and new design to improve the performance of electronic products.
Traditional electronic equipment materials
The traditional electronic equipment and materials of epoxy resin, polyurethane rubber, polyisobutylene (PIB), acrylic acid and p-xylene, each material has its unique advantages and limitations, used in adhesives, sealants, thermal conduction thermal coating, thermal conductivity, thermal gel filling and sealing agent and thermal interface materials.
Epoxy resin can usually with different substrate bond, in the conditions of room temperature or heating under high temperature curing, but the performance is limited, reducing between components, circuit and substrate with different degree of thermal stress caused by the advantages of polyurethane rubber is not; with low moisture penetration, good soft, to reduce stress, but most have limited temperature performance, usually requires good bonding strength between metal and can be obtained using the primer; and properties of polyurethane rubber polyisobutylene is similar, but resistant to solvents, Oils and chemicals are relatively poor; p-xylene was used for the synthesis of conformal coatings, the deficiency is the high cost of pollutant sensitive, vibration is easy to crack, can be used in vacuum; acrylic acid is usually seen as a low-cost option, but with the requirements of the standard Increase, its competitiveness is declining.
Performance of organic silicon thermal conductive materials
In addition to meet the automotive electronic products of insulation, moisture-proof, anti fouling, corrosion, heat and other basic requirements, silicone also has excellent performance in thermal stability, elastic, moisture resistance, the commonly used substrates of adhesion, low impurity, and processing technology compatibility, these properties help automotive electronic products it has higher reliability and longer life.
1 Thermal stability. The intermolecular force of organic silicon polymer is very small with time, and the operation, physical and electrical properties are very stable and can withstand the harsh environment in -50 ~ +200.
2 excellent humidity resistance. Silicone is not easy to absorb water molecules, at the same time, the high gas permeability makes rapid moisture dissipation, thereby eliminating the potential source of corrosion.
3 excellent adhesion. Silicone very low surface tension and excellent wetting properties, as well as the bonding characteristics obtained through advanced adhesive agents, to help achieve no void bond.
4 low stress. Because the elastic material can help to reduce the influence of vibration, and can absorb the thermal expansion difference between the sensitive component and the base material, the low modulus is important to minimize the stress of the electronic components. In the typical operating temperature range of automotive electronics, the current silicone formula does not show the glass temperature (Tg), so the modulus in this cycle to maintain a fairly constant, this performance is significantly better than the elastic epoxy resin.
Application of organic silicon thermal conductive materials in automotive electronics
Because of excellent performance, thermal conductivity, thermal conductivity, adhesive sealant sealant, heat conduction, thermal gel coating, thermal interface materials and management component packaging materials and semiconductor coating products silicone conductive materials can be made into all kinds of application, to protect the engine control module, ignition coil and ignition module, power module system the brake system module, emission control module etc..