The application prospect of the hottest polymer ba

The application prospect of polymer based PTC material is expected

polymer based positive temperature coefficient material (PTC) is full of vitality as an intelligent conductive polymer material. Polymer based PTC material is a kind of composite material based on organic polymer and mixed with conductive fillers such as carbon black, graphite or metal powder, metal oxide, etc. Its biggest feature is that the resistivity of the material increases with the increase of temperature. Near the melting point of crystalline polymer, the resistivity can increase by several or even more orders of magnitude. Due to its excellent electrical properties, convenient molding and processing, good designability and low cost, polymer based PTC material is a functional material with good application prospects. At present, Raychem of the United States is the world leader in this field, and Shanghai Changyuan Weian is the pacesetter in this field in China. In addition, Zhejiang University, East China University of science and technology, Sun Yat sen University, Beijing University of Aeronautics and Astronautics, Shenzhen Changyuan Weian and some other scientific research enterprises have also carried out the development of polymer based PTC materials

polymer based PTC Composites are receiving increasing attention because of their soft texture, easy processing and molding, low manufacturing cost, large conductive range, low room temperature resistivity, and can be used at low temperatures. They have quickly become a hot spot in the development of PTC materials in medical treatment, computers, program-controlled exchanges, batteries, auto parts, household appliances, industrial instruments, launch vehicles Fire alarm and other fields have also been widely used

the polymer based PTC material is connected in series in the load circuit as a circuit protection element. When the circuit is in the working state, the current flowing through the polymer based PTC protection element is not enough to make its temperature exceed the switching temperature, and the PTC protection element is in a low resistance state; Once the circuit fails (such as overcurrent, overvoltage, overheating), it will increase the loop current. At this time, the resistance of PTC element at the new risi Asia Pacific sanitary products industry forum increases rapidly due to self heating, and its resistivity increases rapidly by several orders of magnitude (3 ~ 9), thus forcing the current to drop rapidly, leaving the circuit in a "disconnected" state. After troubleshooting (that is, the current is reduced to the normal state or the temperature is reduced), due to the memory characteristics of the material, the molecular structure will return to the original tight and regular state at low temperature, the conductive particles will contact again, the current channel will be restored, and its resistance will return to the low resistance state. As protective components, polymer based PTC materials are widely used in communication circuits, electronic ballasts for energy-saving lamps, micro motors, automobiles and other fields

the room temperature resistance of polymer based PTC materials is small. When the temperature exceeds the critical point and comprehensively improves the competitiveness of the new material industry, its resistivity increases sharply with the temperature, which is surprising. It can inhibit the continuous temperature rise of heating materials, so as to automatically adjust the output power. It is composed of multiple parts to realize the spontaneous control of temperature. The self-control temperature heater made of polymer material has many advantages, which can be widely used in the heating, heat preservation, antifreeze and snow melting devices of gas-liquid transmission pipelines, instruments, tanks, etc. Industrialized countries mainly include the United States, Britain, Germany, Japan, etc., and China has also begun research and production in this regard. It can be seen that polymer based PTC heating elements are also widely used as heating elements

on the whole, like the current development direction of electronic components, thermistors made of polymer based PTC materials are developing in the direction of high precision, high reliability, long life, small, thin and chip. In terms of performance, on the premise of meeting the above requirements of small and thin size, high voltage resistance, low resistance at room temperature and low leakage current are the main directions of thermistors

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