Method for improving high-density polyethylene /carbon ink composite material positive temperature coefficient property

Abstract

The invention discloses a method for improving high-density polyethylene / carbon ink composite material positive temperature coefficient property, which comprises, (1) charging high density polyethylene 100 parts, carbon black 35-65 parts, polycaproamide 25-50 parts, maleic anhydride grafted polythene 0-45 parts, composite anti-oxidant 0.2-0.8 part into a rubber mill for milling, obtaining high-density polyethylene / carbon black composite, (2) molding the mixture into sheet material, heating the surface of the sheet material to 220 deg C, pressing into copper electrode sheets.

Description

1. Technical Field [0001] The invention relates to a method for improving the positive temperature coefficient (PTC) performance of a high-density polyethylene (HDPE) / carbon black (CB) composite material, and belongs to the field of polymer processing. 2. Background technology [0002] Since Frydman discovered the PTC phenomenon in low-density polyethylene (LDPE) filled with carbon black (CB) in 1945, PTC materials based on polymers have achieved great results in theoretical research and engineering application technologies. With the development of over-current protection components, self-controlled temperature heating devices and temperature sensors made of polymer PTC materials, they have been widely used in electronics, automobiles, medical, chemical, food and other fields. Many foreign companies, such as the Raychem Company of the United States and the Fujichang Wire Company of Japan, have been able to produce better quality self-recoverable fuses and self-controlled temperat...

AI Technical Summary

Problems solved by technology

There are many companies abroad, such as Raychem in the United States and Fujichang Electric Wire Co., Ltd. in Japan, which can produce self-recovery fuses and self-controlling heating cables with good quality. Due to the late start of theoretical research in China, and foreign companies' research on material preparation The process is strictly kept secret, so the scale of domestic industrial production is small, the variety of products is scarce, and the quality is poor

[0003] At present, the biggest problem of polymer PTC materials is that the stability of PTC effect is poor during repeated thermal cycles, and it is difficult to obtain low room temperature resistivity and high PTC strength at the same time.

Irradiation crosslinking of materials can solve the above problems to a certain extent, but the cost is high, the requirements for ambient atmosphere are high, and the uniformity of crosslinking for thick samples is poor

US5164133, US4514620, CN1343560, CN1188779, CN1363629, etc. have all disclosed methods for improving the performance of polymer PTC materials, which have improved the PTC strength of the material and the stability of the PTC effect to a certain extent, but the manufacturing processes of these methods are all relatively complicated. And the PTC strength of the obtained materials is not very high

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