Polytetrafluoroethylene (PTFE) base electrothermal thick film and manufacturing method thereof

Abstract

The invention discloses a polytetrafluoroethylene (PTFE) base electrothermal thick film, comprising the following materials according to percentage by weight: 20-30% of flake graphite, 8-15% of acetylene black, 5-8% of carbon fiber powder, 4-6% of short carbon fiber, 5-8% of nickel powder, 5-8% of silver powder, 1-3% of manganese dioxide, 1-3% of iron sesquioxide, 1-3% of carbon black dispersant, 20-25% of PTFE dispersion liquid and 10-25% of PTFE diluent. The invention also discloses a manufacturing method of the PTFE base thick film, comprising the steps of grinding and uniformly mixing the flake graphite, the acetylene black, the carbon fiber powder, the short carbon fiber, the nickel powder, the silver powder, the manganese dioxide and the iron sesquioxide according to the proportion, mixing and ultrasonically dispersing the mixture, the carbon black dispersant, the PTFE dispersion liquid and the PTFE diluent according to the proportion to prepare a electrothermal thick film paste, and drying and sintering the electrothermal thick film paste, after a through printing process so as to manufacture the PTFE base electrothermal thick film. The manufacturing method provided by the invention is applicable to high-voltage electrothermal equipment, good in stability and using effect, and is not demoulded.

Description

technical field [0001] The invention relates to a polytetrafluoroethylene-based electric heating thick film and a manufacturing method thereof, belonging to a manufacturing method of an electric heating device. In particular, it relates to a polytetrafluoroethylene-based electric heating thick film which adopts a stainless steel screen plate for printing and depositing. Background technique [0002] At present, in many fields such as household appliances and industrial appliances, electric heating products are more and more widely used. Among them, carbon film electric heating film is more and more common for heating, but carbon film electric heating film products have many limitations in application, and are only suitable for low-voltage and ultra-low-voltage currents or for batteries or for adapters after transformers. Carbon film electric heating film products are not suitable for high voltage or mains voltage and current; in addition, the current carbon film electric he...

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Problems solved by technology

Among them, carbon film electric heating film is more and more common for heating, but carbon film electric heating film products have many limitations in application, and are only suitable for low-voltage and ultra-low-voltage currents or for batteries or for adapters after transformers. Carbon film electric heating film products are not suitable for high voltage or mains voltage and current; in addition, the current carbon film electric heating film printed on the carrier is a thin electric heating film, and its maximum thickness is about 0.1mm, which cannot Make thick electric heating film, thin carbon film electric heating film is not resistant to high voltage, thin carbon film electric heating film is easy to catch fire and burn after high voltage electric shock, and the leakage current is too large when electrified, and there are redness and burning. Low mechanical strength, not resistant to vibration, weak thermal shock resistance, resulting in thin carbon film electric heating film falling off, short circuit and sparking, the line conduction performance is reduced, and it is easy to ablate

The stability and reliability of its products cannot be guaranteed, resulting in the shortcomings of the thin carbon film electric heating film heating material, such as serious power attenuation and rapid aging after high voltage or mains voltage is energized.

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