CN109215833A - A kind of carbon nanotube and PDMS electrically conductive composite and preparation method thereof - Google Patents
A kind of carbon nanotube and PDMS electrically conductive composite and preparation method thereof Download PDFInfo
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- CN109215833A CN109215833A CN201810995814.1A CN201810995814A CN109215833A CN 109215833 A CN109215833 A CN 109215833A CN 201810995814 A CN201810995814 A CN 201810995814A CN 109215833 A CN109215833 A CN 109215833A
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- pdms
- carbon nanotube
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- conductive composite
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/04—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of carbon-silicon compounds, carbon or silicon
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
- H01B1/24—Conductive material dispersed in non-conductive organic material the conductive material comprising carbon-silicon compounds, carbon or silicon
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
Abstract
The invention discloses a kind of carbon nanotubes and PDMS electrically conductive composite and preparation method thereof, method includes the following steps: by carbon nanotube powder and volatile solvent；It is ultrasonically treated and carbon nano tube dispersion liquid is made；By PDMS monomer and volatile solvent；It is ultrasonically treated and PDMS monomer dispersion liquid is made；Carbon nano tube dispersion liquid is mixed with PDMS monomer dispersion liquid, ultrasonic treatment is allowed to be uniformly dispersed；Evaporate the volatile solvent in mixture；Curing agent is added to be solidified.Electrically conductive composite preparation method of the invention can be improved the dispersibility of carbon nanotube, improves the conductive network in carbon nanotube and PDMS electrically conductive composite, improves the electric conductivity of electrically conductive composite.
Description
Technical field
The present invention relates to composite conducting materials, more particularly to a kind of carbon nanotube and PDMS electrically conductive composite and its preparation
Method.
Background technique
" number one killer " of the cardiovascular disease as the people of the world, main bases are from electrocardiogram.Heart exists
Each cardiac cycle, cardiac muscle cell go electric signal caused by pole, multipole that can form potential difference in body surface.Several electrodes are connected
In limbs, electrocardiogram can be obtained after sampling to bioelectricity.Ag/AgCl electrode acquisition physiology is clinically generallyd use at present
Electric signal.This wet electrode can not only stimulate skin, and conductive paste can dry up as time increases and gradually, can not be long-term
Carry out the monitoring of electro-physiological signals.It can be very good to solve the above problems using the composite dry electrode of polymer, polymer has
Flexible and bio-compatibility, therefore can comfortably be used for a long time.
By the retrieval discovery to existing technical literature, use polymer that can be divided into as the dry electrode of flexible substrates at present
Two classes.The first kind is that metal material is transferred to polymer surfaces to form conductive film, such as Chinese patent application
201310240424.0 report the flexible electrode preparation method of splash-proofing sputtering metal layer to polymer surfaces, but the dry electrode of metal material
Poor anti jamming capability, corrosion resistance are low, and motion artifacts are obvious, can not still overcome the problems, such as in long term monitoring electro-physiological signals.
Second class be electrically conductive particles such as metal nanoparticle, carbon nanotube, graphene film etc. and mixed with polymers are formed it is conductive compound
Material.Carbon nanotube has high length-diameter ratio and random alignment, and good conductive network can be formed in space, therefore is optimal
Conductive filling material.Polymer in conducing composite material generally selects dimethyl silicone polymer
(Polydimethylsiloxane, PDMS) is widely used since it is with good mechanical performance and bio-compatibility
In medical material field.Chinese patent application 201310290230.1, which is disclosed, prepares flexibility using carbon nanotube and PDMS material
The method of physiological dry electrode.However, cause biggish Van der Waals force since specific surface area of carbon nanotube is higher, dispersion when
It waits to be easy to be formed and reunite, good conductive network can not be formed.Therefore, divide carbon nanotube effectively uniformly in PDMS
It dissipates, improves the conductive network of carbon nanotube and PDMS electrically conductive composite, improve electric conductivity, being that the prior art is urgently to be resolved asks
Topic.
Summary of the invention
It is compound it is a primary object of the present invention to overcome the deficiencies of the prior art and provide a kind of carbon nanotube and PDMS conduction
Object and preparation method thereof improves leading for electrically conductive composite to obtain the electrically conductive composite of the carbon nanotube with high dispersion
Electrical property.
To achieve the above object, the invention adopts the following technical scheme:
A kind of preparation method of carbon nanotube and PDMS electrically conductive composite, comprising the following steps:
By carbon nanotube powder and volatile solvent；
It is ultrasonically treated and carbon nano tube dispersion liquid is made；
By PDMS monomer and volatile solvent；
It is ultrasonically treated and PDMS monomer dispersion liquid is made；
Carbon nano tube dispersion liquid is mixed with PDMS monomer dispersion liquid, ultrasonic treatment is allowed to be uniformly dispersed；
Evaporate the volatile solvent in mixture；
Curing agent is added to be solidified.
Further:
The volatile solvent is one of n-hexane, dehydrated alcohol, toluene or a variety of.
The carbon nanotube be multi-walled carbon nanotube, preferably 45-55 μm of length, internal diameter 3-5nm, outer diameter 8-15nm it is more
Wall carbon nano tube, most preferred length are 50 μm.
It includes: to be received carbon using ultrasonic cell disruptor that the ultrasonic treatment, which is made the step of carbon nano tube dispersion liquid,
The mixture of mitron and volatile solvent carries out ultrasonic disperse 1h-4h under condition of ice bath.
It includes: using supersonic wave cleaning machine by PDMS monomer that the ultrasonic treatment, which is made the step of PDMS monomer dispersion liquid,
30min-2h is handled with the mixture of volatile solvent.
The step of carbon nano tube dispersion liquid is mixed with PDMS monomer dispersion liquid, ultrasonic treatment includes: using ultrasound
Wave cleaning machine handles 4h-9h.
Described includes: using temperature constant magnetic stirring water-bath the step of evaporating volatile solvent in mixture in constant temperature
30min-3h is stirred at 70 DEG C.
The curing agent quality and PDMS monomer weight ratio are 1:5-1:10.
Magnetic agitation 10min-20min is also carried out after curing agent is added.
A kind of carbon nanotube and PDMS electrically conductive composite are the carbon nanotubes that are prepared using the preparation method with
PDMS electrically conductive composite.
Inventor is studied for a long period of time and is largely practiced, and is able to propose technical solution of the present invention, is provided a kind of carbon nanotube
With the preparation method of PDMS electrically conductive composite, carbon nano tube dispersion liquid and PDMS dispersion liquid is made respectively first, then by two kinds
After dispersion liquid mixing, then the mixture by being ultrasonically treated the carbon nanotube for obtaining homogeneous, PDMS and volatile solvent.Being evaporated can
Curing agent is added after volatile solvent can be obtained homogeneous, the good carbon nanotube-PDMS composite material of electric conductivity.
Carbon nanotube can be highly dispersed in PDMS by preparation method of the invention, and being formed has excellent conductive performance
Carbon nanotube-PDMS composite material.Carbon nanotube-PDMS the conducing composite material of preparation can be used for acquiring the dry electricity of electro-physiological signals
The production of pole, dry electrode obtained not only conduct electricity very well, and also have adhesiveness and conformability with skin, can effectively inhibit to transport
Dynamic artefact, reduces contact impedance.
In the preferred scheme, the present invention using multi-walled carbon nanotube (Multiwall Carbon Nanotubes,
MWCNT) rather than single-walled carbon nanotube is as the electrically conductive particles compound with PDMS.Inventors have found that the caliber of single-walled carbon nanotube
Reunion is more readily formed in dispersion since its specific surface energy is very high in very little, and multi-walled carbon nanotube is relative to single
Pipe is easier to carry out dispersing, and inventor also has found after many experiments, using 45-55 μm of length, internal diameter 3-5nm, outer diameter 8-
The multi-walled carbon nanotube of 15nm, the dispersion effect mixed with PDMS is best, and the electric conductivity of obtained electrically conductive composite is best.
In the preferred scheme, the present invention is using n-hexane as volatile solvent；Inventors have found that molten using n-hexane
Agent is easy to dispersion as solvent, multi-walled carbon nanotube and PDMS monomer in n-hexane solvent, can improve dispersion well
Efficiency help to obtain optimal dispersion effect.
Detailed description of the invention
Fig. 1 is the flow diagram of the MWCNT-PDMS electrically conductive composite preparation method of the embodiment of the present invention.
Fig. 2 is the process flow chart of the MWCNT-PDMS electrically conductive composite preparation method of the embodiment of the present invention.
Specific embodiment
It elaborates below to embodiments of the present invention.It is emphasized that following the description is only exemplary,
The range and its application being not intended to be limiting of the invention.
Refering to fig. 1 and Fig. 2, in one embodiment, a kind of preparation method of carbon nanotube and PDMS electrically conductive composite, packet
Include following steps: by carbon nanotube powder and volatile solvent；It is ultrasonically treated and carbon nano tube dispersion liquid is made；PDMS is mono-
Body and volatile solvent；It is ultrasonically treated and PDMS monomer dispersion liquid is made；Carbon nano tube dispersion liquid and PDMS monomer are dispersed
Liquid mixing, ultrasonic treatment are allowed to be uniformly dispersed；Evaporate the volatile solvent in mixture；Curing agent is added to be solidified.
In a preferred embodiment, the volatile solvent is one of n-hexane, dehydrated alcohol, toluene or a variety of.
In a preferred embodiment, the carbon nanotube is multi-walled carbon nanotube, preferably 45-55 μm of length, internal diameter 3-
The multi-walled carbon nanotube of 5nm, outer diameter 8-15nm, most preferred length are 50 μm.
In a preferred embodiment, the ultrasonic treatment be made carbon nano tube dispersion liquid the step of include: using ultrasound
The mixture of carbon nanotube and volatile solvent is carried out ultrasonic disperse 1h-4h by wave cell disruptor under condition of ice bath.
In a preferred embodiment, the ultrasonic treatment be made PDMS monomer dispersion liquid the step of include: using ultrasound
The mixture of PDMS monomer and volatile solvent is handled 30min-2h by wave cleaning machine.
In a preferred embodiment, the carbon nano tube dispersion liquid is mixed with PDMS monomer dispersion liquid, ultrasonic treatment
Step includes: to handle 4h-9h using supersonic wave cleaning machine.
In a preferred embodiment, described includes: using constant temperature magnetic the step of evaporating volatile solvent in mixture
Power stirring water-bath stirs 30min-3h at 70 DEG C of optimal constant temperature.
In a preferred embodiment, the curing agent quality and PDMS monomer weight ratio are 1:5-1:10.
In a preferred embodiment, magnetic agitation 10min-20min is also carried out after curing agent being added, after stirring evenly,
Complete solidification.
A kind of carbon nanotube and PDMS electrically conductive composite are the carbon nanotubes that are prepared using the preparation method with
PDMS electrically conductive composite.
Referring to Fig. 2, in a typical preferred embodiment of the invention, MWCNT-PDMS electrically conductive composite preparation method
The following steps are included:
Step (a): MWCNT powder is mixed with volatile organic solvent；Preferably, using 50 μm of length, internal diameter
The multi-walled carbon nanotube of 3-5nm, outer diameter 8-15nm, and use n-hexane solvent as volatile solvent.
Step (b): use cell disruptor (the new sesame SCIENTZ-IID of model) by the mixing of MWCNT and volatile solvent
Object carries out ultrasonic disperse 90min under condition of ice bath.
Step (c): PDMS monomer is mixed with volatile organic solvent；Preferably, using n-hexane solvent conduct
Volatile solvent.
Step (d): the mixture of PDMS monomer and volatile solvent is ultrasonically treated 1h using supersonic wave cleaning machine.
Step (e): the MWCNT dispersion liquid prepared in step (b), (d) is mixed with PDMS monomer dispersion liquid, using super
Sound wave cleaning machine handles 6h.
Step (f): temperature constant magnetic stirring water-bath is used, under conditions of most preferably 70 DEG C of constant temperature of temperature condition, to step
Suddenly (e) resulting mixture magnetic agitation 1h, evaporates n-hexane solvent.
Step (g): it after curing agent is added, is placed on magnetic stirrer and stirs 10min.Preferably, curing agent and PDMS are mono-
The mass ratio of body is 1:10.
Step (h): being put into baking oven, and 80 DEG C, 2h can be prepared by homogeneous MWCNT-PDMS conduction after being solidified is compound
Object.
The MWCNT-PDMS conducing composite material of preparation of the embodiment of the present invention can be used for acquiring the dry electrode of electro-physiological signals
Production, dry electrode obtained not only conduct electricity very well, and also have adhesiveness and conformability with skin, can effectively inhibit movement pseudo-
Mark reduces contact impedance.Specifically, MWCNT high degree of dispersion in the MWCNT-PDMS conducing composite material, have prior art without
The good conductive network that method obtains improves electric conductivity, and there is the material good flexibility can preferably be bonded with skin,
Using dry electrode made from the material, the symptom of user's skin allergy will not be caused under long-time service, and can be effective
Inhibit the motion artifact of signal, the contact impedance of reduction and skin.By cleaning, sterilizing, the electrical property of the material will not influence
Can, it is reusable using the dry electrode for changing material preparation, meet the theory of economical environment-protective.
The above content is combine it is specific/further detailed description of the invention for preferred embodiment, cannot recognize
Fixed specific implementation of the invention is only limited to these instructions.For those of ordinary skill in the art to which the present invention belongs,
Without departing from the inventive concept of the premise, some replacements or modifications can also be made to the embodiment that these have been described,
And these substitutions or variant all shall be regarded as belonging to protection scope of the present invention.
Claims (10)
1. the preparation method of a kind of carbon nanotube and PDMS electrically conductive composite, which comprises the following steps:
By carbon nanotube powder and volatile solvent；
It is ultrasonically treated and carbon nano tube dispersion liquid is made；
By PDMS monomer and volatile solvent；
It is ultrasonically treated and PDMS monomer dispersion liquid is made；
Carbon nano tube dispersion liquid is mixed with PDMS monomer dispersion liquid, ultrasonic treatment is allowed to be uniformly dispersed；
Evaporate the volatile solvent in mixture；
Curing agent is added to be solidified.
2. the preparation method of carbon nanotube according to claim 1 and PDMS electrically conductive composite, which is characterized in that described to wave
Hair property solvent is one of n-hexane, dehydrated alcohol, toluene or a variety of.
3. the preparation method of carbon nanotube according to claim 1 or 2 and PDMS electrically conductive composite, which is characterized in that institute
State carbon nanotube be multi-walled carbon nanotube, preferably 45-55 μm of length, internal diameter 3-5nm, outer diameter 8-15nm multi-wall carbon nano-tube
Pipe, most preferred length are 50 μm.
4. the preparation method of carbon nanotube according to any one of claims 1 to 3 and PDMS electrically conductive composite, feature exist
In the step of carbon nano tube dispersion liquid is made in, the ultrasonic treatment include: using ultrasonic cell disruptor by carbon nanotube
Ultrasonic disperse 1h-4h is carried out under condition of ice bath with the mixture of volatile solvent.
5. the preparation method of carbon nanotube according to any one of claims 1 to 4 and PDMS electrically conductive composite, feature exist
In the step of PDMS monomer dispersion liquid is made in, the ultrasonic treatment include: using supersonic wave cleaning machine by PDMS monomer with wave
The mixture of hair property solvent handles 30min-2h.
6. the preparation method of carbon nanotube according to any one of claims 1 to 5 and PDMS electrically conductive composite, feature exist
In the step of carbon nano tube dispersion liquid is mixed with PDMS monomer dispersion liquid, ultrasonic treatment includes: using ultrasonic cleaning
Machine handles 4h-9h.
7. the preparation method of carbon nanotube according to any one of claims 1 to 6 and PDMS electrically conductive composite, feature exist
In described includes: using temperature constant magnetic stirring water-bath the step of evaporating volatile solvent in mixture at 70 DEG C of constant temperature
Lower stirring 30min-3h.
8. the preparation method of carbon nanotube according to any one of claims 1 to 7 and PDMS electrically conductive composite, feature exist
In the curing agent quality and PDMS monomer weight ratio are 1:5-1:10.
9. the preparation method of carbon nanotube according to any one of claims 1 to 8 and PDMS electrically conductive composite, feature exist
In, be added curing agent after also carry out magnetic agitation 10min-20min.
10. a kind of carbon nanotube and PDMS electrically conductive composite, which is characterized in that be using according to claim 1 to any one of 9 institutes
The carbon nanotube and PDMS electrically conductive composite that the preparation method stated is prepared.
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Cited By (4)
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| CN110082012A (en) * | 2019-05-24 | 2019-08-02 | 清华大学深圳研究生院 | A kind of pliable pressure sensor and preparation method thereof |
| CN111283690A (en) * | 2020-01-16 | 2020-06-16 | 中国科学院重庆绿色智能技术研究院 | Elastic bionic villus type electronic skin for human-computer interaction safety |
| CN115058120A (en) * | 2022-06-28 | 2022-09-16 | 中国科学技术大学 | Flexible composite conductive material, preparation method and application thereof |
| CN115537028A (en) * | 2022-09-29 | 2022-12-30 | 四川大学 | Preparation method of conductive silicone rubber composite material with interface enhanced isolation structure |
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| CN111283690A (en) * | 2020-01-16 | 2020-06-16 | 中国科学院重庆绿色智能技术研究院 | Elastic bionic villus type electronic skin for human-computer interaction safety |
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| CN115537028A (en) * | 2022-09-29 | 2022-12-30 | 四川大学 | Preparation method of conductive silicone rubber composite material with interface enhanced isolation structure |
| CN115537028B (en) * | 2022-09-29 | 2023-06-23 | 四川大学 | Preparation method of conductive silicon rubber composite material with interface enhanced isolation structure |
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Application publication date: 20190115 |