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A kind of flexible polymer-based PTC material for thermal control at room temperature and preparation method thereof

A flexible polymer and warming technology, applied in the direction of film/sheet adhesives, adhesives, etc., can solve the problems that the material cannot be thinned, the high-precision temperature control at room temperature cannot be practically applied, and the flexibility of PTC materials cannot be achieved. , to achieve the effects of making up for the flexibility and inability to be thinned, good PTC characteristics and flexibility, and simple and feasible preparation methods

Active Publication Date: 2021-07-23
合肥低碳研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a flexible polymer-based PTC material for thermal control at room temperature in view of the problems that the existing room temperature PTC materials cannot be flexible and cannot be thinned, so that they cannot be practically applied to high-precision temperature control at room temperature. and its preparation method, while ensuring that the prepared material has good flexibility and can prepare the material into a thin film

Method used

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  • A kind of flexible polymer-based PTC material for thermal control at room temperature and preparation method thereof
  • A kind of flexible polymer-based PTC material for thermal control at room temperature and preparation method thereof
  • A kind of flexible polymer-based PTC material for thermal control at room temperature and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The specific preparation steps of a flexible polymer-based PTC material for thermal control at room temperature are as follows:

[0027] (1) Add 45g of ethylene octene block copolymer (OBC) and 105g of paraffin into the stainless steel kettle body, cover the sealing cover tightly, then put the stainless steel kettle body into a constant temperature oil bath, and connect the vacuum pump through a rubber tube The exhaust port of the stainless steel kettle body is used to evacuate the inside of the kettle body, and stir and mix evenly with a digital constant speed mixer at a temperature of 150-170°C and a speed of 300 rpm;

[0028] (2) Add 100g of graphite powder (GP) again, stir at a speed of 300 rpm at a temperature of 150-170°C under vacuum conditions, stir and mix evenly to obtain a mixture;

[0029] (3) Press the mixed material into a disc sample with a diameter of 30mm and a thickness of 5mm by a hot press, cool to room temperature and set it, and let it stand for 3-...

Embodiment 2

[0035] The specific preparation steps of a flexible polymer-based PTC material for thermal control at room temperature are as follows:

[0036] (1) Add 45g of ethylene octene block copolymer (OBC) and 105g of n-octadecane into the stainless steel kettle body, cover and seal it tightly, then put the stainless steel kettle body into a constant temperature oil bath, and put the vacuum pump through the rubber Connect the pipe to the exhaust port of the stainless steel kettle body, vacuumize the inside of the kettle body, and stir and mix evenly with a digital constant speed mixer at a temperature of 150-170°C and a speed of 300 rpm;

[0037] (2) Add 100g of graphite powder (GP) again, stir at a speed of 300 rpm at a temperature of 150-170°C and a vacuum condition, and mix evenly to obtain a mixture;

[0038] (3) Press the mixed material into a film of 140mm*70mm*0.8mm by a hot press, cool to room temperature and shape it, let it stand for 6-8 hours, and wait for its structure to b...

Embodiment 3

[0041] The specific preparation steps of a flexible polymer-based PTC material for thermal control at room temperature are as follows:

[0042](1) Add 45g of ethylene octene block copolymer (OBC) and 135g of paraffin into the stainless steel kettle body, cover the sealing cover tightly, then put the stainless steel kettle body into a constant temperature oil bath, and connect the vacuum pump through a rubber tube The exhaust port of the stainless steel kettle body is used to evacuate the inside of the kettle body, and stir and mix evenly with a digital constant speed mixer at a temperature of 150-170°C and a speed of 300 rpm;

[0043] (2) Add 20 g of conductive carbon black (CB), and stir at a speed of 300 rpm at a temperature of 150-170° C. under vacuum conditions, and stir and mix evenly to obtain a mixture;

[0044] (3) Press the mixed material into a disc sample with a diameter of 30mm and a thickness of 5mm by a hot press, cool to room temperature and set it, and let it s...

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Abstract

The invention discloses a flexible polymer-based PTC material for thermal control at room temperature and a preparation method thereof. The material includes a block copolymer, a phase-change matrix and a conductive filler, wherein the mass of the block copolymer and the phase-change matrix Ratio is (20:80)~(40:60), the mass ratio of described conductive filler is less than 80%; The present invention adds block copolymer in the composite material of paraffin wax and graphite powder or conductive carbon black as supporting material, and By adjusting the formula of each component, the Curie temperature of the PTC effect of the prepared material is -10-40°C, which has good flexibility and can realize thin film, and can be applied to active temperature control of electronic devices and other normal temperatures In the field of thermal control, it makes up for the main defects of the current room temperature thermal control PTC materials, which are not flexible and cannot be prepared into thin films.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a flexible polymer-based PTC material for normal temperature thermal control 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 changes slightly when the temperature is low. When the temperature exceeds the Curie temperature, the resistance value of the material increases with increased sharply with increasing temperature. 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. Among them, polymer-based PTC materials have the advantages of simple preparation and low cost, and are currently widely researched and applied. [0003] At present, most poly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J7/24C09J7/20C08L91/06C08L53/00C08K3/04C08K5/01C08J5/18
CPCC08J5/18C08J2353/00C08J2391/06C08J2453/00C08K2201/001C09J7/20C09J7/24C09J2301/124C09J2301/312C09J2301/314C09J2301/41C09J2301/414
Inventor 程文龙汪若江
Owner 合肥低碳研究院
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