CN109320746A - A kind of preparation method of temperature sensitive PTC graphene, PTC graphene conductive slurry and the heating film thus prepared - Google Patents
A kind of preparation method of temperature sensitive PTC graphene, PTC graphene conductive slurry and the heating film thus prepared Download PDFInfo
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- CN109320746A CN109320746A CN201811076175.5A CN201811076175A CN109320746A CN 109320746 A CN109320746 A CN 109320746A CN 201811076175 A CN201811076175 A CN 201811076175A CN 109320746 A CN109320746 A CN 109320746A
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Abstract
The invention discloses a kind of temperature sensitive PTC graphene conductive slurries and preparation method thereof.The described method includes: graphene powder modification in the concentrated sulfuric acid and nitric acid mixed solution after washed, is obtained modified graphene；The modified graphene is uniformly dispersed in a solvent, grafted monomers are then added, in the case where being passed through inert gas, stirring is added dropwise initiator, and reaction system is heated to 50-80 DEG C, stops stirring when canescence floccule can be observed in solution；It takes precipitating to be dried, obtains temperature sensitive PTC graphene.Such temperature sensitive PTC graphene is added in macromolecule matrix, the conductive network of formation resistance can become larger as the temperature rises, to realize PTC effect.
Description
Technical field
The invention belongs to graphene application fields, more particularly it relates to a kind of temperature sensitive PTC graphene, PTC
The preparation method of graphene conductive slurry and the heating film thus prepared.
Background technique
General traditional polymer PTC material is mainly by dispersing conductive filler (such as conductive black, carbon nanotube)
It is prepared in crystalline macromolecule resin.After temperature raising, high molecular crystallinity segment expansion makes such material
It obtains the conductive network that conductive filler is formed to disconnect, and then the electric conductivity of material is made to be deteriorated, resistance increases.Such resistance is with temperature
Increased effect is just PTC (Positive Temperature Coefficient, positive temperature coefficient) effect.It is imitated based on PTC
It answers, high molecular PTC material is applied to field of electric heating, and self-control can be realized when operating temperature is higher, power is reduced,
It prevents from overheating and reduces energy consumption.But the PTC performance of existing polymer PTC material is mainly by crystalline polymer resin come real
It is existing, poor universality, processing difficulties, and long-term cooling thermal impact is not tolerated, the service life is shorter.
Therefore, there is a need in the art for new ptc material, higher stability, versatility and processing performance are provided, and is used for
Electric heating material is prepared, the use needs of current application scenarios are applicable in.
Summary of the invention
In order to provide the ptc material of novel high-stability, versatility and excellent processing characteristics, the present invention provides a kind of systems
It the method for standby temperature sensitive PTC graphene and temperature sensitive is led by the temperature sensitive PTC graphene of the method preparation as prepared by conductive filler
Plasma-based material, and the heating film thus prepared.
Therefore, in a first aspect, the present invention provides a kind of methods of temperature sensitive PTC graphene, which comprises
(1) graphene powder is modified processing in the mixed solution of the concentrated sulfuric acid and nitric acid (volume ratio 3:1-1:1),
Centrifuge washing obtains modified graphene；
(2) modified graphene is divided in solvent (petroleum ether, N,N-dimethylformamide, toluene and dimethylbenzene etc.)
It dissipates uniformly, graft is then added, be passed through oxygen in inert gas (nitrogen, argon gas) exclusion system, agitation and dropping initiator is (even
Nitrogen bis-isobutyronitrile, azobisisoheptonitrile, benzoyl peroxide, boron trifluoride-ether complex), reaction system is heated to 50-80
DEG C, when canescence floccule can be observed in solution, i.e. reaction is completed, and stops stirring；
(3) it takes precipitating to be dried, obtains temperature sensitive PTC graphene.
In one embodiment, the graft be oligomerisation of ethylene-acetate ethylene copolymer, it is oligomeric polyformaldehyde, oligomeric
Mixture of the polyethylene to one of monomer of emergencing copolymer or the two.
In second aspect, the present invention provides the temperature sensitive PTC graphenes of the method preparation with first aspect present invention.
In one embodiment, the present invention also provides the electrocondution slurries including the temperature sensitive PTC graphene.
In one embodiment, the electrocondution slurry further includes solvent and macromolecule resin or silicon rubber.
In one embodiment, the electrocondution slurry the preparation method is as follows: by the temperature sensitive PTC graphene and high
Molecule resin mixing, then be added solvent, dispersing agent (stearoyl amine, polyvinylpyrrolidone, neopelex),
Defoaming agent (the fatty acid ester compounded object of higher alcohols, polyoxyethylene polyoxypropylene pentaerythrite ether, polyoxyethylene polyoxy propyl alcohol amidogen ether,
Polypropylene glycerol aether and polyoxyethylene polyoxypropylene glycerin ether etc.), dispersion mixing.
In one embodiment, the macromolecule resin is selected from epoxy resin, acrylic resin, polyurethane resin, ammonia
Base resin.The macromolecule resin can be solid or slurry.
In one embodiment, the solvent can be selected according to resin types, including aqueous solvent or organic molten
Agent, such as water, ethyl alcohol, n,N-Dimethylformamide, hexamethylene, dimethylbenzene, petroleum ether, dimethyl acetamide.
In one embodiment, the viscosity of the temperature sensitive PTC graphene conductive slurry is in 1000-50000mpas model
In enclosing, Gu containing being 15-30% mass fraction；Temperature sensitive PTC graphene content 0.5%-5% mass fraction.
In the third aspect, the present invention provides a kind of temperature sensitive PTC graphene conductive slurry systems by second aspect of the present invention
Standby temperature sensitive graphene composite heating film.Preferably, the temperature sensitive graphene composite heating film is prepared as follows:
The temperature sensitive PTC graphene conductive slurry of second aspect of the present invention is coated on the resins basement membrane such as PET, drying obtains
The temperature sensitive graphene composite conductive film of PTC；
Chaff is overlayed on composite conductive film as electrode, temperature can be obtained as encapsulating film in insulating resin film
Quick graphene composite heating film.
In one embodiment, resistance change rate of the temperature sensitive graphene composite heating film of the PTC from 0 DEG C to 100 DEG C
It is 2-50 times.
Method of the invention is by being modified graphene, by graphene surface graft crystalline polymer chain
Section, so that conductive filler itself has temperature-sensing property.Such temperature sensitive graphene is added in macromolecule matrix, the conductive mesh of formation
Network resistance can become larger as the temperature rises, to realize PTC effect.
Detailed description of the invention
By the following drawings, the present invention will be described:
Fig. 1 is the resistance change curves by the preparation-obtained temperature sensitive graphene composite heating film of embodiment at 0-100 DEG C.
Specific embodiment
In the present invention, in the temperature sensitive PTC graphene conductive slurry, the temperature sensitive PTC graphene is led as temperature sensitive
Electric additive.
In the present invention, the solvent can dissolve macromolecule resin.
Embodiment
Embodiment 1:
Prepare temperature sensitive PTC graphene, temperature sensitive PTC graphene conductive slurry and temperature sensitive graphene heating film, comprising:
(1) 2g graphene powder is placed in the 100ml concentrated sulfuric acid and nitric acid (volume proportion 3:1)
Mixed solution in modification (being stirred to react 1h at 35 DEG C) through multiple centrifuge washing (in being to supernatant liquor
Property), 80 DEG C of drying of precipitating are obtained into modified graphene；
(2) the 0.05g modified graphene is uniformly dispersed in the n,N-Dimethylformamide solvent of 100ml, then
Grafting oligomerisation of ethylene-acetate ethylene copolymer monomer is added, azodiisobutyronitrile is added dropwise after being passed through nitrogen, stirring, 1h, it is then right
Reaction system is heated to 50 DEG C, stops stirring when observing canescence floccule after reaction 48h；
(3) solution left standstill after reacting, takes precipitating to carry out centrifuge washing, and vacuum drying obtains temperature sensitive PTC graphene；
(4) the temperature sensitive PTC graphene based on above-mentioned preparation prepares temperature sensitive PTC graphene conductive slurry, comprising: weighs 0.2g
The temperature sensitive graphene of above-mentioned gained and the heating of 3.8g acrylic resin are dissolved in 6g n,N-Dimethylformamide (DMF), and are added hard
Acyl amine dispersing agent, polyoxyethylene polyoxypropylene pentaerythrite ether are defoaming agent, are continued at 60 DEG C by high speed disperser
1h is stirred, uniformly mixed temperature sensitive PTC graphene conductive slurry is obtained.Temperature sensitive PTC graphene content is about 2% in this slurry,
Admittedly containing 20%, electrocondution slurry viscosity is about 10000mpas；
(5) temperature sensitive graphene heating film is prepared based on temperature sensitive PTC graphene conductive slurry, comprising: temperature sensitive PTC graphene is led
Plasma-based material is coated on the resins basement membrane such as PET, and 120 DEG C are heated 30 minutes, and temperature sensitive PTC graphene is obtained after solvent is dried completely
Composite conductive film then overlays two parallel chaffs as electrode, insulating resin film conduct on composite conductive film
Temperature sensitive PTC graphene composite heating film can be obtained in encapsulating film.
Performance measurement: its resistance variations at a temperature of different operating i.e. PTC performance, the temperature sensitive PTC graphene of gained are measured
Composite heating film is 15 times in 0-100 DEG C of resistance change rate, i.e., PTC intensity is 15 times.
Embodiment 2:
Prepare temperature sensitive PTC graphene, temperature sensitive PTC graphene conductive slurry and temperature sensitive graphene heating film, comprising:
(1) 2g graphene powder is placed in the mixed solution of the 100ml concentrated sulfuric acid and nitric acid (volume proportion 1:1) and is changed
Property processing (being stirred to react 1h at 35 DEG C) after multiple centrifuge washing (to supernatant liquor be neutrality), will precipitating 50 DEG C of drying obtain
Modified graphene；
(2) the 0.05g modified graphene is uniformly dispersed in the toluene solvant of 100ml, it is oligomeric that grafting is then added
Benzoyl peroxide is added after being passed through argon gas, stirring, 1h in polyvinyl monomer, is then heated to 80 DEG C to reaction system, reaction
Stop stirring when observing canescence floccule after 18h；
(3) solution left standstill after reacting, takes precipitating to carry out centrifuge washing, and vacuum drying obtains temperature sensitive PTC graphene；
(4) the temperature sensitive PTC graphene based on above-mentioned preparation prepares temperature sensitive PTC graphene conductive slurry, comprising: weighs 0.1g
The temperature sensitive PTC graphene of above-mentioned gained and the heating of 2.9g epoxy resin are dissolved in 7g petroleum ether, and the dispersion of stearoyl amine is added
Agent, polyoxyethylene polyoxypropylene pentaerythrite ether are defoaming agent, persistently stir 1h by high speed disperser at 60 DEG C, are mixed
Close uniform temperature sensitive PTC graphene conductive slurry.Temperature sensitive PTC graphene content is about 1% in this slurry, admittedly contain 30%, it is conductive
Slurry viscosity is about 50000mpas；
(5) temperature sensitive graphene heating film is prepared based on temperature sensitive PTC graphene conductive slurry, comprising: temperature sensitive PTC graphene is led
Plasma-based material is coated on the resins basement membrane such as PET, and 120 DEG C are heated 30 minutes, and temperature sensitive PTC graphene is obtained after solvent is dried completely
Composite conductive film then overlays two parallel chaffs as electrode, insulating resin film conduct on composite conductive film
Temperature sensitive PTC graphene composite heating film can be obtained in encapsulating film.
Performance measurement: its resistance variations at a temperature of different operating i.e. PTC performance, the temperature sensitive PTC graphene of gained are measured
Composite heating film is 50 times in 0-100 DEG C of resistance change rate, i.e., PTC intensity is 50 times.
Embodiment 3:
Prepare temperature sensitive PTC graphene, temperature sensitive PTC graphene conductive slurry and temperature sensitive graphene heating film, comprising:
(1) 2g graphene powder is placed in the mixed solution of the 100ml concentrated sulfuric acid and nitric acid (volume proportion 2:1) and is changed
Property processing (being stirred to react 1h at 35 DEG C) after multiple centrifuge washing (to supernatant liquor be neutrality), will precipitating 75 DEG C of drying obtain
Modified graphene；
(2) the 0.05g modified graphene is uniformly dispersed in the xylene solvent of 100ml, it is low that grafting is then added
Poly- polyformaldehyde monomer is added boron trifluoride-ether complex after being passed through nitrogen, stirring, 1h, is then heated to 70 to reaction system
DEG C, stop stirring when observing canescence floccule after reaction 56h；
(3) solution left standstill after reacting, takes precipitating to carry out centrifuge washing, and vacuum drying obtains temperature sensitive PTC graphene；
(4) the temperature sensitive PTC graphene based on above-mentioned preparation prepares temperature sensitive PTC graphene conductive slurry, comprising: weighs
The temperature sensitive PTC graphene of the above-mentioned gained of 0.05g and the heating of 0.95g polyurethane resin are dissolved in 9g dimethyl acetamide, and are added poly-
The fatty acid ester compounded object of vinylpyrrolidone, higher alcohols is defoaming agent, persistently stirs 1h by high speed disperser at 60 DEG C, obtains
To uniformly mixed temperature sensitive PTC graphene conductive slurry.Temperature sensitive PTC graphene content is about 0.5% in this slurry, admittedly contain
10%, electrocondution slurry viscosity is about 1000mpas；
(5) temperature sensitive PTC graphene heating film is prepared based on temperature sensitive PTC graphene conductive slurry, comprising: temperature sensitive PTC graphite
Alkene electrocondution slurry is coated on the resins basement membrane such as PET, and 120 DEG C are heated 30 minutes, obtains temperature sensitive PTC after solvent is dried completely
Graphene composite conductive film then overlays two parallel chaffs as electrode on composite conductive film, and insulating resin is thin
Temperature sensitive PTC graphene composite heating film can be obtained as encapsulating film in film.
Performance measurement: its resistance variations at a temperature of different operating i.e. PTC performance, the temperature sensitive PTC graphene of gained are measured
Composite heating film is 18 times in 0-100 DEG C of resistance change rate, i.e., PTC intensity is 18 times.
Embodiment 4:
Prepare temperature sensitive PTC graphene, temperature sensitive PTC graphene conductive slurry and temperature sensitive graphene heating film, comprising:
(1) 2g graphene powder is placed in the mixed solution of the 100ml concentrated sulfuric acid and nitric acid (volume proportion 3:1) and is changed
Property processing (being stirred to react 1h at 35 DEG C) after being repeatedly centrifuged and being washed with water (being neutral to eluate), 100 DEG C of drying obtain
Modified graphene；
(2) the 0.05g modified graphene is uniformly dispersed in the n,N-Dimethylformamide solvent of 100ml, then
Grafting oligomerisation of ethylene-acetate ethylene copolymer monomer is added, azobisisoheptonitrile is added dropwise after being passed through nitrogen, stirring, 1h, it is then right
Reaction system is heated to 60 DEG C, stops stirring when observing canescence floccule after reaction 45h；
(3) solution left standstill after reacting, takes precipitating to carry out centrifuge washing, and vacuum drying obtains temperature sensitive PTC graphene；
(4) the temperature sensitive PTC graphene based on above-mentioned preparation prepares temperature sensitive PTC graphene conductive slurry, comprising: weighs 0.5g
The temperature sensitive PTC graphene of above-mentioned gained and 4g water-based acrylic resin slurry (admittedly containing 50%) heating are dissolved in 5.5g ethyl alcohol, and are added
Enter that polyvinylpyrrolidone is dispersing agent, polyoxyethylene polyoxy propyl alcohol amidogen ether is defoaming agent, passes through high speed disperser at 60 DEG C
1h is persistently stirred, uniformly mixed temperature sensitive PTC graphene conductive slurry is obtained.Temperature sensitive PCT graphene content is about in this slurry
5%, admittedly containing 25%, electrocondution slurry viscosity is about 25000mpas；
(5) temperature sensitive graphene heating film is prepared based on temperature sensitive PTC graphene conductive slurry, comprising: temperature sensitive PTC graphene is led
Plasma-based material is coated on the resins basement membrane such as PET, and 120 DEG C are heated 30 minutes, and temperature sensitive PTC graphene is obtained after solvent is dried completely
Composite conductive film then overlays two parallel chaffs as electrode, insulating resin film conduct on composite conductive film
Temperature sensitive PTC graphene composite heating film can be obtained in encapsulating film.
Performance measurement: its resistance variations at a temperature of different operating i.e. PTC performance, the temperature sensitive PTC graphene of gained are measured
Composite heating film is 2 times in 0-100 DEG C of resistance change rate, i.e., PTC intensity is 2 times.
Embodiment 5:
Prepare temperature sensitive PTC graphene, temperature sensitive PTC graphene conductive slurry and temperature sensitive graphene heating film, comprising:
(1) 2g graphene powder is placed in the mixed solution of the 100ml concentrated sulfuric acid and nitric acid (volume proportion 2.5:1)
Modification (being stirred to react 1h at 35 DEG C) (being neutrality to supernatant liquor) after multiple centrifuge washing, 60 DEG C of drying are modified
Graphene；
(2) the 0.05g modified graphene is uniformly dispersed in the xylene solvent of 100ml, it is low that grafting is then added
Azodiisobutyronitrile initiator is added after being passed through nitrogen, stirring, 1h, then to anti-in poly- polyethylene vinyl acetate polymer monomers
It answers system to be heated to 75 DEG C, stops stirring when observing canescence floccule after reaction 30h；
(3) solution left standstill after reacting, takes precipitating to carry out centrifuge washing, and vacuum drying obtains temperature sensitive PTC graphene；
(4) the temperature sensitive PTC graphene based on above-mentioned preparation prepares temperature sensitive PTC graphene conductive slurry, comprising: weighs 0.2g
The temperature sensitive PTC graphene of above-mentioned gained and 3g aqueous epoxy resins slurry (admittedly containing 50%) heating are dissolved in 6.8g water, and are added ten
Dialkyl benzene sulfonic acids sodium is dispersing agent, polyoxyethylene polyoxypropylene glycerin ether is defoaming agent, passes through high speed disperser at 60 DEG C
1h is persistently stirred, uniformly mixed temperature sensitive PTC graphene conductive slurry is obtained.Temperature sensitive PCT graphene content is about in this slurry
2%, admittedly containing 15%, electrocondution slurry viscosity is about 15000mpas；
(5) temperature sensitive graphene heating film is prepared based on temperature sensitive PTC graphene conductive slurry, comprising: temperature sensitive PTC graphene is led
Plasma-based material is coated on the resins basement membrane such as PET, and 120 DEG C are heated 30 minutes, and temperature sensitive PTC graphene is obtained after solvent is dried completely
Composite conductive film then overlays two parallel chaffs as electrode, insulating resin film conduct on composite conductive film
Temperature sensitive PTC graphene composite heating film can be obtained in encapsulating film.
Performance measurement: its resistance variations at a temperature of different operating i.e. PTC performance, the temperature sensitive PTC graphene of gained are measured
Composite heating film is 7 times in 0-100 DEG C of resistance change rate, i.e., PTC intensity is 7 times.
Embodiment 6:
Prepare temperature sensitive PTC graphene, temperature sensitive PTC graphene conductive slurry and temperature sensitive graphene heating film, comprising:
(1) 2g graphene powder is placed in the mixed solution of the 100ml concentrated sulfuric acid and nitric acid (volume proportion 2.5:1)
Modification (being stirred to react 1h at 35 DEG C) (being neutrality to supernatant liquor) after multiple centrifuge washing, is dried precipitating 60 DEG C
To modified graphene；
(2) the 0.05g modified graphene is uniformly dispersed in the petroleum ether solvent of 100ml, it is low that grafting is then added
Benzoyl peroxide initiator is added after being passed through nitrogen, stirring, 1h, then to anti-in poly- polyethylene vinyl acetate polymer monomers
It answers system to be heated to 50 DEG C, stops stirring when observing canescence floccule after reaction 30h；
(3) solution left standstill after reacting, takes precipitating to carry out centrifuge washing, and vacuum drying obtains temperature sensitive PTC graphene；
(4) the temperature sensitive PTC graphene based on above-mentioned preparation prepares temperature sensitive PTC graphene conductive slurry, comprising: weighs 0.3g
The temperature sensitive PTC graphene of above-mentioned gained and the heating of 2.2g amino resins are dissolved in 7g hexamethylene, and polyvinylpyrrolidone is added and is
Dispersing agent, polypropylene glycerol aether are defoaming agent, persistently stir 1h by high speed disperser at 60 DEG C, obtain uniformly mixed
Temperature sensitive PTC graphene conductive slurry.Temperature sensitive PTC graphene content is about 3% in this slurry, admittedly contain 25%, electrocondution slurry viscosity
About 25000mpas；
(5) temperature sensitive graphene heating film is prepared based on temperature sensitive PTC graphene conductive slurry, comprising: temperature sensitive PTC graphene is led
Plasma-based material is coated on the resins basement membrane such as PET, and 120 DEG C are heated 30 minutes, and temperature sensitive PTC graphene is obtained after solvent is dried completely
Composite conductive film then overlays two parallel chaffs as electrode, insulating resin film conduct on composite conductive film
Temperature sensitive PTC graphene composite heating film can be obtained in encapsulating film.
Performance measurement: its resistance variations at a temperature of different operating i.e. PTC performance, the temperature sensitive PTC graphene of gained are measured
Composite heating film is 5 times in 0-100 DEG C of resistance change rate, i.e., PTC intensity is 5 times.Illustrative examples are shown in Fig. 1,
By as the temperature rises, the resistance of heating film is gradually increased the 90K risen at 100 DEG C from 0 DEG C of about 18K Ω known in figure
Ω, about 5 times of resistance change rate, i.e. PTC intensity is 5 times, has apparent PTC effect.
Comparative example 1:
(1) it weighs 0.5g graphene powder and the heating of 2g acrylic resin is dissolved in 7.5g toluene solvant, and poly- second is added
Alkene pyrrolidone is dispersing agent, polypropylene glycerol aether is defoaming agent, persistently stirs 1h by high speed disperser at 60 DEG C, obtains
To uniformly mixed graphene conductive slurry.Temperature sensitive graphene content is about 5% in this slurry, admittedly containing 20%, electrocondution slurry is viscous
Degree is about 8000mpas；
(1) graphene conductive slurry is coated on the resins basement membrane such as PET, and 120 DEG C are heated 30 minutes, is dried completely to solvent
After obtain graphene composite conductive film, two parallel chaffs are then overlayed on composite conductive film as electrode, insulation
Graphene composite heating film can be obtained as encapsulating film in resin film.
Performance measurement: its resistance variations at a temperature of different operating i.e. PTC performance, gained graphene composite heating are measured
Film in 0-100 DEG C of resistance substantially without significant change, i.e., without apparent PTC performance.
Resistance change rate of the temperature sensitive PTC graphene composite heating film from 0 DEG C to 100 DEG C is 2-50 times.
The solution of the present invention to be prepared into possibility based on conventional high molecular ptc material, and controllability is big with versatility
Big enhancing, can the temperature sensitive PTC graphene conductive slurry of prepare with scale, and can the excellent temperature sensitive PTC graphite of processability based on this
Alkene composite heating film.Temperature sensitive electrocondution slurry of the invention can also be used in temperature sensor, overheating protection, current control and temperature report
The fields such as alert.
Claims (8)
1. a kind of preparation method of temperature sensitive PTC graphene:
Graphene powder is placed in modification in the concentrated sulfuric acid and nitric acid mixed solution, washs, obtains modified graphene；
The modified graphene is uniformly dispersed in a solvent, then passes to inert gas, is kept stirring, grafted monomers are added,
Initiator is added dropwise, reaction system is then heated to 50-80 DEG C, stops stirring when canescence floccule can be observed in solution,
Solution left standstill after reacting；
It takes precipitating to be dried, obtains temperature sensitive PTC graphene.
2. method described in claim 1, the grafted monomers are oligomerisation of ethylene-acetate ethylene copolymer, oligomeric polyformaldehyde, low
Poly- polyethylene, to the mixture of one of monomer of emergencing copolymer or the two.
3. a kind of temperature sensitive PTC graphene conductive slurry, is prepared as follows: prepared by the method for claims 1 or 2
Temperature sensitive PTC graphene is mixed with macromolecule resin or silicon rubber, and solvent, dispersing agent, defoaming agent is added, and passes through dispersion mixing.
4. the temperature sensitive PTC graphene conductive slurry of claim 3, the macromolecule resin include epoxy resin, phenolic resin, third
Olefin(e) acid resin and amino resins etc..
5. the temperature sensitive PTC graphene conductive slurry in claim 3, the solvent can be selected according to resin types, including
Aqueous solvent and organic solvent, such as water, ethyl alcohol, n,N-Dimethylformamide, dimethylbenzene, petroleum ether, dimethyl acetamide can
Dissolve the solvent of 5 macromolecule resins or silicon rubber.
6. the viscosity of the temperature sensitive PTC graphene conductive slurry in claim 3, the temperature sensitive PTC graphene conductive slurry exists
Within the scope of 1000-50000mpas, Gu containing being 15-30% mass fraction；Temperature sensitive PTC graphene content 0.5%-5% mass point
Number.
7. a kind of temperature sensitive PTC graphene composite heating film, is prepared as follows: by the gained temperature sensitive stone of PTC in claim 3
Black alkene electrocondution slurry is coated on the resins basement membrane such as PET, and drying obtains temperature sensitive PTC graphene composite conductive film.
8. the temperature sensitive PTC graphene composite heating film in claim 7, the resistance change rate from 0 DEG C to 100 DEG C is 2-50 times.
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