Introduction of antistatic grade thermoplastic elastomer TPE material and conductive TPE
Domestic Thermoplastic elastomerTPE/TPR Materials The industry is constantly developing and improving. It has been gradually used in all walks of life, and the requirements for materials are becoming more and more stringent, such as: flame retardant grade, high elasticity, Development of special materials such as abrasion resistance.
With the continuous improvement of materials, the products are constantly innovating, and the requirements of conductive grade TPE/TPR materials are also the inevitable result of market development, with the development of the market. The thermoplastic elastomer industry is becoming more and more colorful, providing better and more comfortable materials for people's lives. Before talking about conductive TPE/TPR, first understand the conductive rubber from the side, and then evaluate the technical difficulty of research and development of conductive TPE/TPR.
Electrical Rubber: Refer to Baidu Encyclopedia, conductive rubber is the uniform distribution of conductive particles such as glass silver plating, aluminum silver plating, silver, etc. In the case of (generally silicone rubber), conductive particles are contacted by pressure to achieve good electrical conductivity. Both military and commercial applications. Its main role is sealing and electromagnetic shielding. The product can be molded or extruded and available in sheet or other die cut shapes.
Conductive rubber conductive principle: Conductive rubber filled conductive particles are in contact with each other when filled with a certain volume to form an electronic continuous state. , thus having electrical conductivity. Conductive rubber must be subjected to a certain compressive force in order to conduct electricity well, and the structural design must ensure proper pressure without pressure. The main role of conductive rubber is sealing and electromagnetic shielding. It is commonly used in some electronic materials and components, and has important applications in the aerospace and military industries.
Then analyze the conductivity of the TPE. According to the surface resistance value of the material, in terms of dielectric properties, the TPE can be classified into the following three categories:
1. The surface resistance of the product reaches 10 or more and is the insulation level TPE/TPR;
2. Anti-static grade TPE/TPR between the 5-12th power of the product surface resistance value of 10;
3. The surface resistance of the product reaches 10 and below the 5th power level is the conductive grade TPE/TPR.
According to the above division, there is still a certain difference between anti-static grade TPE and conductive TPE. The usual TPE/TPR are antistatic grade materials. As far as anti-static is concerned, in actual cases, the surface resistance values of different products required by different customers may be different, and sometimes there may be certain restrictions on the compounding system of TPE. If the TPE/TPR is to be electrically conductive, special material modification is required. TPE/TPR has a similar molecular chain structure with rubber. According to the rubber modification idea above, TPE/TPR seems to be imitated. However, it is necessary to fully consider the similarities and differences between TPE compounding system and silicone rubber. The compounding system of TPE is complicated, and it is necessary to consider the compatibility of the phase structure of each component, the uniformity of blending and dispersion, and the like.
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