PTC composite material containing polyethylene, carbon black and conductive modified graphene and preparation method

A composite material and polyethylene technology, applied in the field of functional polymer materials, can solve the problems of low electrical conductivity, complicated manufacturing method, and reduced graphene electrical conductivity, and achieve low room temperature resistivity, low NTC strength, and reduced room temperature resistance. The effect of rate and filler amount

Active Publication Date: 2022-07-05
EAST CHINA UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to give full play to the role of graphene, it is particularly important to modify the surface of graphene and maintain a high electrical conductivity after modification. However, graphene used in many current applications is mostly single-layer or less Layer graphene, the production method is complicated and the conductivity is not high, and the modification of the graphene surface will further reduce the conductivity of graphene

Method used

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  • PTC composite material containing polyethylene, carbon black and conductive modified graphene and preparation method
  • PTC composite material containing polyethylene, carbon black and conductive modified graphene and preparation method
  • PTC composite material containing polyethylene, carbon black and conductive modified graphene and preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The preparation method of conductive modified graphene comprises the following steps:

[0043] 1 g of sodium polystyrene sulfonate and 5 g of multi-layer graphene (with a thickness of about 5 nm and a diameter of 7 to 15 μm) were added to 950 ml of a 1M sulfuric acid solution, and ultrasonically stirred for 1 h to obtain a mixed system A.

[0044] 0.5 g of 3,4-ethylenedioxythiophene monomer was added to mixed system A, and ultrasonic stirring was continued for 1 h under ice bath conditions to obtain mixed system B.

[0045] Initiating system C was obtained by dissolving 0.8 g of ammonium persulfate and 12 mg of ferric chloride in 50 ml of 1 M sulfuric acid solution.

[0046]The initiation system C was added dropwise to the mixed system B for 30 min to initiate a polymerization reaction, which was stirred for 24 h in an ice-water bath. The product was filtered, washed with deionized water and ethanol for several times, and freeze-dried to obtain conductive modified grap...

Embodiment 2

[0052] The preparation method of conductive modified graphene comprises the following steps:

[0053] Add 1 g of sodium polystyrene sulfonate and 20 g of multi-layer graphene (with a thickness of about 5 nm and a diameter of 5-17 μm) into 950 ml of 0.1 M hydrochloric acid solution, and ultrasonically stirred for 1 h to obtain a mixed system A.

[0054] 1 g of 3,4-ethylenedioxythiophene monomer was added to mixed system A, and ultrasonic stirring was continued for 1 h under ice bath conditions to obtain mixed system B.

[0055] Initiating system C was obtained by dissolving 1.9 g of ammonium persulfate and 14 mg of ferric chloride in 50 ml of 0.1 M hydrochloric acid solution.

[0056] The initiation system C was added dropwise to the mixed system B for 30 min to initiate the polymerization reaction, and the reaction was stirred under an ice bath for 12 h. The product was filtered, washed with deionized water and ethanol for several times, and freeze-dried to obtain conductive ...

Embodiment 3

[0060] The preparation method of conductive modified graphene comprises the following steps:

[0061] 3g of sodium dodecyl sulfate and 6g of multi-layer graphene (with a thickness of about 5nm and a diameter of 7-15μm) were added to 950ml of 0.5M sulfuric acid solution, and ultrasonically stirred for 1h to obtain a mixed system A.

[0062] 1 g of 3,4-ethylenedioxythiophene monomer was added to mixed system A, and ultrasonic stirring was continued for 1 h under ice bath conditions to obtain mixed system B.

[0063] Initiating system C was obtained by dissolving 2.4 g of ammonium persulfate and 8 mg of ferric chloride in 50 ml of 0.5 M sulfuric acid solution.

[0064] The initiation system C was added dropwise to the mixed system B for 30 min to initiate a polymerization reaction, which was stirred for 36 h under an ice bath. The product was filtered, washed with deionized water and ethanol for several times, and freeze-dried to obtain conductive modified graphene.

[0065] A ...

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Abstract

The invention discloses a PTC composite material containing polyethylene, carbon black and conductive modified graphene, which is prepared from the following components in parts by weight: 50-75 parts of polyethylene, 1-8 parts of conductive modified graphene, 2-15 parts of compatibilizer and 20-40 parts of carbon black. The PTC composite material of the invention has the characteristics of low room temperature resistivity, high PTC strength, low NTC strength after peak temperature, good resistance reproducibility, low cost and the like, and can be used for preparing low room temperature resistivity and safe and reliable self-controlling temperature electricity Heat tracing devices and overcurrent and overheat protection devices have broad application prospects.

Description

technical field [0001] The invention belongs to the technical field of functional polymer materials, and in particular relates to a PTC composite material containing polyethylene, carbon black and conductive modified graphene and a preparation method. Background technique [0002] Polymer PTC functional material is a kind of material with positive temperature coefficient of resistance, which is composed of crystalline polymer matrix and nano-conductive particles. When the material is near the transition temperature, its resistivity rapidly increases to a limit value, and the reversible transition of (semiconductor)-insulator occurs. Therefore, it can be used for self-controlling electric heating belts, overcurrent protection devices and other temperature sensing devices. At present, polymer PTC materials still have low room temperature conductivity, poor resistance stability, and the phenomenon of resistance drop above the melting point (NTC effect), which restricts the appl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/06C08L51/06C08K9/08C08K3/04
CPCC08L23/06C08L2207/062C08L2205/08C08K2201/003C08L51/06C08K9/08C08K3/042C08K3/04
Inventor 王庚超史光发蔡晓敏计成志
Owner EAST CHINA UNIV OF SCI & TECH
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