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Composite ptc material for thermal control at room temperature

A warm and material technology, applied in the direction of resistors with positive temperature coefficients, etc., can solve the problems of high Curie temperature of PTC materials that cannot be applied to thermal control at room temperature, low negative temperature coefficient of PTC strength, etc., to eliminate the NTC effect, high PTC strength, wide-ranging effects

Active Publication Date: 2016-03-30
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problem that the Curie temperature of existing PTC materials is generally high and cannot be applied to thermal control at room temperature, and provides a composite PTC material for thermal control at room temperature and a preparation method thereof, while ensuring that the prepared material has higher PTC strength and relatively Low negative temperature coefficient (NTC) effect

Method used

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  • Composite ptc material for thermal control at room temperature
  • Composite ptc material for thermal control at room temperature
  • Composite ptc material for thermal control at room temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The specific preparation steps of the composite PTC material for thermal control at room temperature are as follows:

[0023] 1) Add 45g of low-density polyethylene (LDPE) and 105g of paraffin into the stainless steel kettle body, cover it tightly with a sealing cover, then put the stainless steel kettle body into a constant temperature oil bath, and connect the vacuum pump to the stainless steel kettle body through a rubber tube. The air inlet is used to vacuumize the inside of the kettle body, and at a temperature of 130~170°C and a speed of 60 rpm, stir and mix evenly with a digital display constant speed mixer;

[0024] 2) Then add 100g of graphite powder (GP), stir at a speed of 60 rpm at a temperature of 130~170°C under vacuum conditions, stir and mix evenly to obtain a mixture;

[0025] 3) Press the mixture into a cylinder with a diameter of 30 mm, cool it to room temperature and set it, let it stand for 24 hours, and wait for its structure to be stable to obtain...

Embodiment 2

[0031] 1) Add 45g of low-density polyethylene (LDPE) and 105g of n-octadecane into the stainless steel kettle body, cover it tightly with a sealing cover, then put the stainless steel kettle body into a constant temperature oil bath, and connect the vacuum pump to the stainless steel kettle through a rubber tube. The exhaust port of the kettle body is used to evacuate the inside of the kettle body, and the temperature is 130~170°C and the speed is 60 rpm, and the digital display constant speed mixer is used to stir and mix evenly;

[0032] 2) Then add 100g of graphite powder (GP), stir at a speed of 60 rpm at a temperature of 130~170°C under vacuum conditions, stir and mix evenly to obtain a mixture;

[0033] 3) Press the mixture into a cylinder with a diameter of 30 mm, cool to room temperature and set the shape, and let it stand for 24 hours until the structure is stable to obtain a rod-shaped n-octadecyl composite PTC material; cut and polish with special tools , processed ...

Embodiment 3

[0039] 1) Add 36g of low-density polyethylene (LDPE) and 144g of n-eicosane into the stainless steel kettle body, cover it tightly with a sealing cover, then put the stainless steel kettle body into a constant temperature oil bath, and connect the vacuum pump to the stainless steel kettle through a rubber tube. The exhaust port of the kettle body is used to evacuate the inside of the kettle body, and the temperature is 130~170°C and the speed is 60 rpm, and the digital display constant speed mixer is used to stir and mix evenly;

[0040] 2) Then add 60g of carbon black (CB), stir at a speed of 60 rpm at a temperature of 130~170°C under vacuum conditions, stir and mix evenly to obtain a mixture;

[0041] 3) Press the mixture into a cylinder with a diameter of 30 mm, cool it to room temperature and set it, let it stand for 24 hours, and wait for its structure to be stable to obtain a rod-shaped n-eicosyl composite PTC material; cut and polish it with a special tool , processed i...

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Abstract

The invention relates to a composite PTC (positive temperature coefficient) material for normal temperature heat control. The material comprises the following substances of graphite powder / carbon black, paraffin / alkane substance, and low-density polyethylene. A method for preparing the composite PTC material comprises the following steps: melting and mixing the paraffin or the alkane substance and the low-density polyethylene under the temperature of 130-170 DEG C and a vacuum condition, and uniformly stirring the paraffin or the alkane substance and the low-density polyethylene; then adding the graphite powder or the carbon black, and uniformly stirring and mixing the graphite powder or the carbon black under the temperature of 130-170 DEG C and the vacuum condition to obtain a mixture; putting the mixture into a mold for compression molding, and cooling the mixture to room temperature to obtain the rod-type composite PTC material for the normal temperature heat control. The Curie temperature, at which a PTC effect can be achieved, of the material disclosed by the invention is -10 to 40 DEG C and slightly lower than the melting point of a blended substrate; the material is higher in PTC strength, better eliminates an NTC (negative temperature coefficient) effect and can be applied to active temperature control of electronic appliances and other fields of normal temperature heat control; the main defect that the Curie temperature of the conventional PTC material is not in a normal temperature section is overcome.

Description

technical field [0001] The invention belongs to the technical field of heat-sensitive semiconductor materials with positive temperature coefficients, and in particular relates to a polymer conductive composite material with normal temperature Curie point and high PTC strength and a preparation method thereof. Background technique [0002] PTC material is a heat-sensitive semiconductor material with a positive temperature coefficient. The resistance value of the material remains basically unchanged or only slightly changes within a certain range. When the temperature reaches the Curie temperature, the resistance value of the material increases with The increase in temperature increases dramatically. Positive temperature coefficient materials can be divided into ceramic-based PTC materials and polymer-based PTC conductive composite materials according to the matrix of the material. Polymer PTC materials have attracted widespread attention due to their wide source of raw mater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01C7/02C08L91/06C08L23/06C08K5/01C08K3/04
Inventor 程文龙宋嘉梁袁帅吴万范刘艺
Owner UNIV OF SCI & TECH OF CHINA
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