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High current resistant thermistor polymer composite material and preparation method thereof

A technology of composite materials and thermistors, applied in the direction of resistors with positive temperature coefficients, etc., can solve the problems of not being able to withstand large currents and high voltages, and achieve the effects of eliminating thermal effects, improving thermal conductivity, and easy control of conditions

Inactive Publication Date: 2014-01-15
SHENYANG JIANZHU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a high current-resistant thermistor polymer composite material and its preparation method, which can solve the problems of high current resistance and high resistance that cannot be satisfied by traditional PTC thermistor composite materials. High voltage and other issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 48.00g of polyoxymethylene, 0.96g of carbon nanotubes and 0.96g of silicon powder (particle size: 325 mesh) were mechanically mixed in advance, then added to a double-roller mixer preheated to 190°C, and mixed at 64rpm Refined for 10 minutes to obtain a uniformly mixed composite system; transfer the composite system to a flat vulcanizer at 190°C and 5MPa to shape it in a mold, hold the pressure for 10 minutes and then slowly cool to room temperature (natural cooling in a flat vulcanizer) , to obtain a sheet-like composite material with a predetermined thickness; after the composite material is cut, electrodes and leads are adhered to the surface, heat-encapsulated with powder epoxy resin, and a packaged thermistor is made after cooling. Tested by an electrochemical workstation (LK3200A), the room temperature resistance is 100Ω, the operating current is 35.0mA, and the operating voltage is 10V. Compared with a commercial thermistor with the same resistance value, the oper...

Embodiment 2

[0022] 48.00g of polypropylene, 4.80g of graphene and 2.90g of silicon carbide (325 mesh in particle size) were mechanically mixed in advance, then added to a double-roller mixer preheated to 190°C, and mixed at 64rpm After 10 minutes, a uniformly mixed composite system was obtained; the composite system was transferred to a flat vulcanizer at 190°C and 5 MPa to make it finalized in the mold, and after holding the pressure for 10 minutes, it was slowly cooled to room temperature (natural cooling in a flat vulcanizer), Obtain a sheet-shaped composite material with a predetermined thickness; cut the composite material, adhere electrodes and leads on the surface, perform thermal packaging treatment with powder epoxy resin, and make a packaged thermistor after cooling. Tested by an electrochemical workstation (LK3200A), the room temperature resistance is 47.7Ω, the operating current is 97.6mA, and the operating voltage is 5.0V. Compared with commercial thermistors with the same res...

Embodiment 3

[0024] After mechanically mixing 48.00g of high-density polyethylene (High Density Polyethylene, referred to as "HDPE"), 2.40g of graphitized carbon black, 7.20g of carbon nanotubes and 4.80g of silicon nitride (with a particle size of 325 mesh) in advance, Add it to the twin-roller mixer that has been preheated to 190°C, and knead at 64rpm for 10 minutes to obtain a uniformly mixed composite system; transfer the composite system to a flat vulcanizer at 190°C and 5MPa to make it Set the shape in the mold, hold the pressure for 10 minutes, and then cool slowly to room temperature (natural cooling in a flat vulcanizer) to obtain a sheet-shaped composite material with a predetermined thickness; after cutting the composite material, adhere electrodes and leads on the surface, and use powdered epoxy resin Thermal encapsulation treatment, after cooling, the packaged thermistor is made. Tested by an electrochemical workstation (LK3200A), the room temperature resistance is 3.7Ω, the o...

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Abstract

The invention relates to a high current resistant thermistor polymer composite material and a preparation method thereof, belongs to the fields of functional composite materials and electronic devices, and solves the problem that traditional positive temperature coefficient thermistor composite materials can not meet the requirements of high current resistance and high voltage resistance. The composite material comprises functional fillers and polymer, wherein the adding amount of the functional fillers is 4%-30% of the mass of the polymer; the functional filler is a filler with thermal conductivity and / or electrical conductivity, and the polymer is crystalline polymer. The functional fillers and the polymer are mixed by melt blending, and are hot-pressed to form a conductive polymer composite material; the conductive polymer composite material is cut; electrodes and leads are adhered to the surface; hot packaging processing is performed by using powdered epoxy resin; and the thermistor with positive temperature coefficient effect is prepared after cooling. The composite material of the invention can be used as a high performance thermistor in fields which require that the thermistor has performance of current resistance and voltage resistance, such as communication, electric power, power plant, etc.

Description

technical field [0001] The invention relates to a high-current-resistant thermistor polymer composite material and a preparation method thereof, belonging to the field of functional composite materials and electronic devices. Background technique [0002] The thermistor has a significant positive temperature coefficient effect (Positive temperature coefficient, PTC effect), that is, the response function characteristic that the resistance of the material increases sharply with the increase of temperature. Thermistors are widely used in industry as devices for overcurrent protection, constant temperature automatic heating, temperature compensation and fire alarm. PTC materials are usually divided into two categories: ceramics and polymers. Ceramic PTC is mainly made of barium titanate doped with trace elements such as lead and strontium and sintered at high temperature. It has a significant PTC effect at the Curie transition temperature; and high Molecular PTC materials are ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L101/00C08L23/12C08L59/02C08L27/14C08L27/08C08L23/06C08K3/04C08K3/02C08K3/34C08K13/04C08K7/00B29B7/00B29C43/58H01C7/02
Inventor 曾尤卢桂霞吴文栋赵丽佳甄影佟钰
Owner SHENYANG JIANZHU UNIVERSITY
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