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Carbon nanotube macromolecule PTC thermal resistor material and fabrication method thereof

A technology of thermistors and carbon nanotubes, applied in the field of polymer PTC thermistors, can solve the problems of shortening the action time, which cannot be realized, and is not ideal enough, and achieves the goal of shortening the action time, short action time, and easy implementation Effect

Active Publication Date: 2015-05-06
SHENZHEN NANOTECH PORT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, in order to reduce the residual current of polymer PTC thermistors and reduce the operating time, the common method used by people is to add metal particles to the raw materials, such as silver, tungsten, copper, nickel, iron, etc. as conductive agents. Either increase the amount of conductive carbon black in the raw material, or add Ketjen carbon to the raw material, but these methods are not ideal, and they cannot shorten the operating time without reducing the R-T curve, thereby reducing the residual current. Purpose

Method used

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  • Carbon nanotube macromolecule PTC thermal resistor material and fabrication method thereof
  • Carbon nanotube macromolecule PTC thermal resistor material and fabrication method thereof
  • Carbon nanotube macromolecule PTC thermal resistor material and fabrication method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take by weighing 12g multi-walled carbon nanotubes, 1.5g antioxidant 1010, 400g acetylene black conductive particles, 216.5g magnesium hydroxide (chemical formula is Mg(OH) 2 ) non-conductive filler, 10g zinc oxide (chemical formula is ZnO), 10g calcium stearate (chemical formula is C 36 h 70 CaO 4 ), the weighed above-mentioned raw materials are subjected to high-stir premixing to form a uniformly mixed mixture. Then weigh 350g of polyethylene, put the mixture uniformly mixed in the previous steps and 350g of polyethylene into an internal mixer, set the temperature of the internal mixer to 180°C, and let it masticate and disperse in the internal mixer for 15 minutes. Then put the masticated and dispersed rubber into the extruder, heat at 175° C. for 2 to 5 minutes, and extrude to prepare a sheet. The above obtained sheet is molded at 180°C for 1 to 5 minutes with a hot press for sample preparation, then annealed at a temperature lower than 50°C for 5 minutes, and fi...

Embodiment 2

[0026] Take by weighing 20g single-walled carbon nanotubes, 1.5g antioxidant 1010, 360g Ketjen black conductive particles, 216.5g aluminum hydroxide (chemical formula is Al(OH) 3 ) non-conductive filler, 10g zinc oxide (chemical formula is ZnO), 10g calcium stearate (chemical formula is C 36 h 70 CaO 4 ), the weighed above-mentioned raw materials are subjected to high-stir premixing to form a uniformly mixed mixture. Then weigh 382g of polyimide, put the homogeneously mixed mixture in the previous steps and 382g of polyimide into the internal mixer, set the temperature of the internal mixer to 180°C, and make it masticate in the internal mixer Disperse for 15 minutes. Then put the masticated and dispersed rubber into the extruder, heat at 175° C. for 2 to 5 minutes, and extrude to prepare a sheet. The above obtained sheet is molded at 180°C for 1 to 5 minutes with a hot press for sample preparation, then annealed at a temperature lower than 50°C for 5 minutes, and finally ...

Embodiment 3

[0028] Take by weighing 30g double-walled carbon nanotubes, 1.2g antioxidant 1010, 300gSP conductive particles, 216.5g aluminum hydroxide (chemical formula is Al(OH) 3 ) non-conductive filler, 10g zinc oxide (chemical formula is ZnO), 10g calcium stearate (chemical formula is C 36 h 70 CaO 4 ), the weighed above-mentioned raw materials are subjected to high-stir premixing to form a uniformly mixed mixture. Then weigh 432.8g of fluoroplastics, put the homogeneously mixed mixture in the previous steps and 432.8g of fluoroplastics into the internal mixer, set the temperature of the internal mixer to 180°C, and make it masticate and disperse in the internal mixer for 15min . Then put the masticated and dispersed rubber into the extruder, heat at 175° C. for 2 to 5 minutes, and extrude to prepare a sheet. The above obtained sheet is molded at 180°C for 1 to 5 minutes with a hot press for sample preparation, then annealed at a temperature lower than 50°C for 5 minutes, and final...

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Abstract

The invention discloses a carbon nanotube macromolecule PTC (positive temperature coefficient) thermal resistor material, which is prepared by mixing the following raw materials by weight percentage: 1-6% of carbon nanotube, 20-50% of polymeric matrix, 0.05-1% of antioxidant 1010, 10-50% of conductive particles, 10-30% of non-conductive packing, 0.1-2.0% of zinc oxide and 0.1-1.0% of calcium stearate, and conducing plasticating, dispersing, sheet fabrication, die pressing, sample preparation, annealing treatment and radiation treatment. According to the carbon nanotube macromolecule PTC thermal resistor material, as the carbon nanotube is added in the fabrication raw materials, a formed R-T (resistance-temperature) curve of the carbon nanotube macromolecule PTC thermal resistor material is raised, the carbon nanotube macromolecule PTC thermal resistor material is more sensitive to temperature; the actuation time (of a macromolecule PTC thermal resistor) is shortened; and the residual current is lowered. The carbon nanotube macromolecule PTC thermal resistor material is good in impedance stability and short in actuation time, and has the characteristics of simple fabrication technology, low raw material and equipment requirements, easiness in implementation and the like.

Description

【Technical field】 [0001] The invention relates to a polymer PTC thermistor, in particular to a carbon nanotube polymer PTC thermistor material for making a PTC thermistor and a preparation method thereof. 【Background technique】 [0002] A thermistor is a resistor whose resistance value is extremely sensitive to temperature, and its most basic characteristic is that its resistance value changes with temperature. Polymer PTC thermistor is a thermistor made of polymer material filled with carbon black particles, which is widely used in post and telecommunications, computers, automobile and motorcycle electronics, mobile phone (lithium) batteries, communication satellites , lightning protection devices, launch vehicles, aircraft, tanks, medical instruments, grain warehouses, fire alarms, household appliances and other electronic circuits, it plays the role of over-current protection or over-temperature protection. Compared with ordinary thermistors, the resistance of polymer PT...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/06C08L79/08C08L27/12C08K13/04C08K7/00C08K3/04C08K3/22C08K5/098
Inventor 梁颖郜天宇赵红娟
Owner SHENZHEN NANOTECH PORT