CN109504016A - A kind of PTC film and preparation method thereof and thermal resistor - Google Patents
A kind of PTC film and preparation method thereof and thermal resistor Download PDFInfo
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- CN109504016A CN109504016A CN201811278913.4A CN201811278913A CN109504016A CN 109504016 A CN109504016 A CN 109504016A CN 201811278913 A CN201811278913 A CN 201811278913A CN 109504016 A CN109504016 A CN 109504016A
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- Prior art keywords
- ptc
- polystyrene
- high molecular
- molecular polymer
- ptc film
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- 238000002360 preparation method Methods 0.000 title abstract description 10
- 239000004793 Polystyrene Substances 0.000 claims abstract description 29
- -1 polyethylene Polymers 0.000 claims abstract description 24
- 239000002033 PVDF binder Substances 0.000 claims abstract description 22
- 239000004743 Polypropylene Substances 0.000 claims abstract description 22
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims abstract description 22
- 229920005669 high impact polystyrene Polymers 0.000 claims abstract description 20
- 239000004797 high-impact polystyrene Substances 0.000 claims abstract description 20
- 229920000642 polymer Polymers 0.000 claims abstract description 20
- 229920002223 polystyrene Polymers 0.000 claims abstract description 19
- 239000004698 Polyethylene Substances 0.000 claims abstract description 13
- 229920000573 polyethylene Polymers 0.000 claims abstract description 13
- 229920001903 high density polyethylene Polymers 0.000 claims abstract description 12
- 239000004700 high-density polyethylene Substances 0.000 claims abstract description 12
- 229920001155 polypropylene Polymers 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 7
- 239000002994 raw material Substances 0.000 claims abstract description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 15
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims description 11
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 11
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 10
- 239000006229 carbon black Substances 0.000 claims description 10
- 239000007822 coupling agent Substances 0.000 claims description 9
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical group [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 239000011231 conductive filler Substances 0.000 claims description 7
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical group O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 239000000919 ceramic Substances 0.000 claims description 4
- 239000011888 foil Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 238000013329 compounding Methods 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims description 2
- 239000000376 reactant Substances 0.000 claims description 2
- BQCIDUSAKPWEOX-UHFFFAOYSA-N 1,1-Difluoroethene Chemical compound FC(F)=C BQCIDUSAKPWEOX-UHFFFAOYSA-N 0.000 claims 1
- WFLOTYSKFUPZQB-UHFFFAOYSA-N 1,2-difluoroethene Chemical group FC=CF WFLOTYSKFUPZQB-UHFFFAOYSA-N 0.000 claims 1
- 239000003610 charcoal Substances 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 18
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 13
- 229910052744 lithium Inorganic materials 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 12
- 239000011159 matrix material Substances 0.000 abstract description 10
- 238000002844 melting Methods 0.000 abstract description 7
- 230000008018 melting Effects 0.000 abstract description 7
- 239000005416 organic matter Substances 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000004880 explosion Methods 0.000 abstract description 3
- 230000001535 kindling effect Effects 0.000 abstract description 3
- 230000000903 blocking effect Effects 0.000 abstract description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 4
- 239000006258 conductive agent Substances 0.000 description 4
- 239000003792 electrolyte Substances 0.000 description 3
- 239000012467 final product Substances 0.000 description 3
- 239000012074 organic phase Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000007086 side reaction Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 150000001336 alkenes Chemical class 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- LLYXJBROWQDVMI-UHFFFAOYSA-N 2-chloro-4-nitrotoluene Chemical compound CC1=CC=C([N+]([O-])=O)C=C1Cl LLYXJBROWQDVMI-UHFFFAOYSA-N 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 125000004185 ester group Chemical group 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/02—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having positive temperature coefficient
- H01C7/028—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having positive temperature coefficient consisting of organic substances
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2351/00—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
- C08J2351/04—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers grafted on to rubbers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/06—Polyethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/10—Homopolymers or copolymers of propene
- C08J2423/12—Polypropene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2425/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Derivatives of such polymers
- C08J2425/02—Homopolymers or copolymers of hydrocarbons
- C08J2425/04—Homopolymers or copolymers of styrene
- C08J2425/06—Polystyrene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2427/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
- C08J2427/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
- C08J2427/12—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C08J2427/16—Homopolymers or copolymers of vinylidene fluoride
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2433/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
- C08J2433/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters
- C08J2433/06—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters of esters containing only carbon, hydrogen, and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C08J2433/10—Homopolymers or copolymers of methacrylic acid esters
- C08J2433/12—Homopolymers or copolymers of methyl methacrylate
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
- C08K13/02—Organic and inorganic ingredients
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0862—Nickel
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/10—Esters; Ether-esters
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- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
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- Compositions Of Macromolecular Compounds (AREA)
- Thermistors And Varistors (AREA)
Abstract
The present invention relates to a kind of thermal resistor and its method field of manufacturing, and in particular to a kind of PTC film and preparation method thereof and thermal resistor.A kind of PTC film, it includes high molecular polymer that it, which prepares raw material, the high molecular polymer is in parts by weight, comprising: and 30-40 parts of polystyrene HIPS, 10-20 parts of one or more of polyethylene HDPE, polypropylene PP, polystyrene PS or polyvinylidene fluoride PVDF.The present invention, as matrix, when lithium battery temperature increases, makes ptc material that Application occur using two or three of organic matter with different melting points, which can be improved the repeatability of ptc material resistance, weaken NTC effect.When short circuit occurs for lithium battery or the thermal runaways such as overcharges, ptc material resistance value increases with temperature and increases always, until blocking internal current to pass through completely, avoids causing the safety accidents such as kindling, explosion with this.
Description
Technical field
The present invention relates to a kind of thermal resistor and its method field of manufacturing, and in particular to a kind of PTC film and its preparation
Method and thermal resistor.
Background technique
With new-energy automobile fast development, entire industry to lithium battery energy density promotion require it is higher and higher, however,
With the promotion of energy density, the safety problem of lithium battery is also more taken seriously.Lithium battery is once in the case where abuse
Operation, for example, short circuit, overcharge, a series of side reactions can occur for inside battery, while generate amount of heat, so cause safety
Problem.
To prevent battery from overcharging and generating amount of heat in the short time under short-circuit conditions, many Battery Plants need
Inside battery or external installation temperature-sensitive device (PTC), ptc material common at present is mainly using organic matter as matrix, thereto
Adulterate the conductive materials such as conductive black, graphite, CNT, graphene.However, there are NTC (negative temperatures for most of PTC films in the market
Coefficient) effect, and conductive carbon surface, there are different degrees of polar group, the cohesive energy ratio is stronger, in addition carbon black specific surface
Larger, the difficult dispersion, easy to reunite in organic matter matrix causes PTC film NTC effect to become strong, influence using.
Since in lithium battery use process, inside can recur many side reactions when temperature is more than 100 DEG C, so being used for
The PTC transition temperature of lithium battery has to be lower than 100 DEG C.Currently, the ptc material for lithium battery is mainly with single polyethylene high score
Sub- polymer is matrix, and adding carbon black thereto is conductive agent, and manufacture craft is simple, and PTC transition temperature is higher (most of super
Cross 120 DEG C), especially its NTC effect is obvious (being more than after certain temperature, resistance value is increased with temperature and reduced), such PTC
Material can not play a good protective effect to lithium battery.
Summary of the invention
Based on drawbacks described above, the present invention proposes a kind of completely new PTC film, and preparing raw material includes high molecular polymer,
The high molecular polymer is in parts by weight, comprising:
30-40 parts of polystyrene HIPS,
One or more of polyethylene HDPE, polypropylene PP, polystyrene PS or polyvinylidene fluoride PVDF 10-20
Part.
Preferably, the high molecular polymer further include:
10-15 parts of polymetylmetacrylate PMMA.
It is highly preferred that the high molecular polymer is by polystyrene HIPS, polyethylene HDPE, polypropylene PP, polystyrene
One or more of PS or polyvinylidene fluoride PVDF and polymetylmetacrylate PMMA composition.
The present invention makes PTC when lithium battery temperature increases as matrix using two or three of organic matter with different melting points
Application occurs for material, and (i.e. conductive agent exceedes infiltration process and the continuous phase in another polymer in a continuous phase
Exceed infiltration process), which can be improved the repeatability of ptc material resistance, weaken NTC effect.When lithium battery occur short circuit or
When the thermal runaways such as overcharging, ptc material resistance value increases with temperature and increases always, until blocking internal current to pass through completely,
It avoids causing the safety accidents such as kindling, explosion with this.
PTC film of the present invention, preparing raw material includes:
Preferably, the coupling agent is preferably titanate esters；
Preferably, the graft reaction agent is preferably maleic anhydride.
Preferably, the ceramic bases are aluminium oxide.
PTC film of the present invention, the conductive filler are preferably selected from one or more of carbon black, nickel powder；
It is highly preferred that the conductive filler is by carbon black and nickel powder according to (2-3): 1 ratio forms.
The present invention uses maleic anhydride so that close ester group is grafted on carbon blacksurface for graft reaction agent, improve conductive agent with polymerize
The compatibility of object.Titanate esters are used to handle for coupling agent carbon blacksurface, so as to improve the carboxyl and hydroxyl of carbon blacksurface
Group adds appropriate nickel powder and is conducive to improve electric conductivity, improves the stability of ptc material, weaken NTC effect.
The present invention replaces traditional single polymers as PTC film using two or three of mixed with polymers and prepares raw material,
Mainly based on high impact polystyrene HIPS, material resistivity at 100 DEG C is maximum for a kind of organic phase in PTC film, and
It does not react at normal temperature with electrolyte and electrode, there is certain PTC intensity, another organic phase is the slightly higher height of fusing point
Melting point polyethylene HDPE, polypropylene PP, polyvinylidene fluoride PVDF, such material melting point are same normal between 130 DEG C -180 DEG C
It does not react with electrolyte and electrode under temperature, third organic phase is then the higher polymetylmetacrylate PMMA (fusing point of fusing point
210 DEG C), it does not also react with electrolyte and electrode under the material room temperature.Conductive filler is carbon black and nickel powder.
As the preferred technical solution of the present invention, its preparation formula of the PTC film is as follows:
Wherein, the high molecular polymer by polystyrene HIPS, polyethylene HDPE or polypropylene PP, polystyrene PS,
One of polyvinylidene fluoride PVDF, polymetylmetacrylate PMMA three compound.
Preferably, the high molecular polymer is 15:(5-6 by mass ratio): polystyrene HIPS, the polyethylene of (4-6)
One of HDPE or polypropylene PP, polystyrene PS, polyvinylidene fluoride PVDF, polymetylmetacrylate PMMA three compounding
It forms.
The present invention is directed to invent a kind of PTC film suitable for lithium ion battery.
The present invention is mixed as matrix, two or three of different melting points macromolecule organic polymer using high impact polystyrene HIPS
It is combined into matrix；Using maleic anhydride be graft reaction agent, titanate esters are coupling agent.The present invention uses carbon black and nickel powder mixing conduct
Conductive agent uses under normal temperature condition, and conductive effect is excellent.Use high impact polystyrene for main film matrix, battery exists
100 DEG C or so (battery occur side reaction is more and the thermal runaway initial stage) can sharply promote film resistance, play PTC effect
It answers.Obviously weaken NTC effect using two or more specific different melting points matrix main materials, when constant temperature increases, resistance
Value is constantly in ascendant trend.
In terms of comprehensive, the present invention uses two or three of organic matter with different melting points as matrix, when lithium battery temperature liter
Gao Shi makes ptc material that Application occur, which can be improved the repeatability of ptc material resistance, weakens NTC effect.When
When lithium battery occurs short circuit or the thermal runaways such as overcharges, ptc material resistance value increases with temperature and increases always, until complete
It blocks internal current to pass through, avoids causing the safety accidents such as kindling, explosion with this.
It is as follows the present invention further provides the preparation method of PTC film described in above-mentioned any one technical solution:
By the high molecular polymer of the molten state, conductive filler, the ceramic bases, the coupling agent, described
High-speed stirred after graft reaction agent mixing.Present invention simultaneously provides PTC films described in above-mentioned any one technical solution
Application for thermal resistor.
Specifically, a kind of thermal resistor, including the PTC film being uniformly applied among double-layer aluminum-foil.
The preparation method of the thermal resistor includes: that will uniformly be applied among double-layer aluminum-foil described in the PTC film,
Suppress sheet to obtain the final product.
Thermal resistor of the present invention has good thermal sensitive effect, with good stability, effectively reduces
NTC effect, reachable -40 DEG C~250 DEG C of applicable operating temperature；Manufacture craft is easy, and material is easy to get, and overload capacity is strong.
Detailed description of the invention
Fig. 1 is the impedance of PTC film and the relationship of temperature provided by embodiment 1-3.
Specific embodiment
The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention..
Embodiment 1
The present embodiment provides a kind of PTC film, preparation formula is as follows:
Molten state high impact polystyrene HIPS, the 15% molten state polyethylene HDPE or (poly- third that mass fraction is 35%
Alkene PP, polyvinylidene fluoride PVDF), 15% carbon black, 10% nickel powder, 20% aluminium oxide, 2.5% coupling agent titanate esters, 2.5% connect
Branch reactant maleic anhydride.
Embodiment 2
The present embodiment provides a kind of PTC film, preparation formula is as follows:
Molten state high impact polystyrene HIPS, the 10% molten state polyethylene HDPE or (poly- third that mass fraction is 30%
Alkene PP, polyvinylidene fluoride PVDF), 10% polymetylmetacrylate PMMA, 15% carbon black, 10% nickel powder, 20% aluminium oxide,
2.5% coupling agent titanate esters, 2.5% graft reaction agent maleic anhydride.
Embodiment 3
The present embodiment provides a kind of PTC films and preparation method thereof, the specific steps are as follows:
Molten state high impact polystyrene HIPS, 15% molten state polystyrene PS, 10% by mass fraction for 35%
Polymetylmetacrylate PMMA, 20% carbon black, 5% nickel powder, 10% aluminium oxide, 2.5% coupling agent titanate esters, 2.5% grafting are anti-
Answer agent maleic anhydride mix after high-speed stirred to obtain the final product.
Embodiment 4-6
Embodiment 4-6 provides a kind of thermal resistor respectively, is respectively that PTC film provided by embodiment 1-3 is uniform
It is applied among double-layer aluminum-foil, compacting sheet to obtain the final product.
Test example 1
This test example provides the impedance of PTC film and the relationship of temperature provided by embodiment 1-3.
Measurement method is according to this field usual manner, as a result as shown in Fig. 1.
It is possible thereby to learn, PTC film of the present invention has following features:
Sensitivity is higher, and operating temperature range is wide, and high-temperature device Applicable temperature is higher than 80 DEG C, and cryogenic device is suitable for most
Low -40 DEG C；Easy processing can be mass-produced at complicated shape；Stability is good, overload capacity is strong.
Although above having used general explanation, specific embodiment and test, the present invention is made to retouch in detail
It states, but on the basis of the present invention, it can be made some modifications or improvements, this is apparent to those skilled in the art
's.Therefore, these modifications or improvements without departing from theon the basis of the spirit of the present invention, belong to claimed
Range.
Claims (10)
1. a kind of PTC film, preparing raw material includes high molecular polymer, which is characterized in that
The high molecular polymer is in parts by weight, comprising:
30-40 parts of polystyrene HIPS,
10-20 parts of one or more of polyethylene HDPE, polypropylene PP, polystyrene PS or polyvinylidene fluoride PVDF.
2. PTC film according to claim 1, which is characterized in that the high molecular polymer further include:
10-15 parts of polymetylmetacrylate PMMA；
Preferably, the high molecular polymer is by polystyrene HIPS, polyethylene HDPE, polypropylene PP, polystyrene PS or poly-
One or more of vinylidene fluoride PVDF and polymetylmetacrylate PMMA composition.
3. PTC film according to claim 1 or 2, which is characterized in that it prepares raw material and includes:
4. PTC film according to claim 3, which is characterized in that the coupling agent is titanate esters；
And/or the ceramic bases are aluminium oxide.
5. PTC film according to claim 3 or 4, which is characterized in that the graft reaction agent is maleic anhydride.
6. according to the described in any item PTC films of claim 3-5, which is characterized in that the conductive filler is preferably selected from charcoal
One or both of black, nickel powder；Preferably, the conductive filler is by carbon black and nickel powder according to (2-3): 1 ratio forms.
7. PTC film according to claim 1 or 2, which is characterized in that the PTC film its prepare raw material according to weight
Measure part meter, comprising:
Wherein, the high molecular polymer is by polystyrene HIPS, polyethylene HDPE or polypropylene PP, polystyrene PS, poly- inclined
One of difluoroethylene PVDF, polymetylmetacrylate PMMA three compound；
Preferably, the high molecular polymer is 15:(5-6 by mass ratio): polystyrene HIPS, the polyethylene HDPE of (4-6)
Or one of polypropylene PP, polystyrene PS, polyvinylidene fluoride PVDF, polymetylmetacrylate PMMA three compounding and
At.
8. a kind of method for preparing the described in any item PTC films of claim 1-7, which is characterized in that
By the high molecular polymer of molten state, the conductive filler, the ceramic bases, the coupling agent, the grafting
High-speed stirred after reactant mixing.
9. the application that the described in any item PTC films of claim 1-7 are used to prepare thermal resistor.
10. a kind of thermal resistor, which is characterized in that including the PTC film being applied among double-layer aluminum-foil, the PTC
Film is described in any one of claim 1-7.
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