CN109990694A - A kind of graphene flexible sensor and preparation method thereof of energy self-healing - Google Patents
A kind of graphene flexible sensor and preparation method thereof of energy self-healing Download PDFInfo
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Abstract
The invention discloses a kind of graphene flexible sensors and preparation method thereof of energy self-healing.This sensor includes sensing element, electrode, conducting wire and self-healing flexible carrier；Wherein, sensing element and electrode are wrapped in self-healing flexible carrier, and the both ends of sensing element are connected with electrode respectively, and conducting wire is connected with electrode and draws except self-healing flexible carrier；The sensing element is the graphene film of buckling, is to be formed smooth graphene film buckling using itself stress of self-healing flexible carrier.The preparation method of this sensor is also disclosed simultaneously.Sensor structure provided by the invention is simple, easy to use, and deformation range is big, high sensitivity, self healing can be carried out to itself crackle destruction, and the fields such as bio-robot, man-made electronic's skin, flexible wearable device can be widely applied.
Description
Technical field
The invention belongs to sensor technical field, more particularly to it is a kind of can self-healing graphene flexible sensor and its
Preparation method.
Background technique
It is wide to deformation range recently as wearable device, the rise of electronic skin, bio-robot, it responds sensitive
The demand of flexible device constantly increasing.This kind of sensor is characterized often through its deformability bring resistance variations
Inductive signal.Traditionally, being directed to the sensing element that deformation is developed is often semiconductor or metal material.Though semiconductor material
Right resistance-strain sensitivity with higher, but its deformation very little, generally below 1%.The resistance-strain sensitivity of metal material
It is poor with deformability (< 3%).Therefore, the application range of the sensing element of semiconductor and metal material will be by great
Limitation.
Graphene is a kind of two-dimensional material for only having a carbon atom thickness, since discovery in 2004, since its is excellent
Mechanical property and electric conductivity, flexibility, stability, be widely used in numerous areas.Patent document CN104949609A is public
" a kind of graphene flexible sensor and its manufacturing method " has been opened, for traditional sensors, the deformation energy of the sensor
Power is highly improved, but deformation degree is generally less than 10%, is only capable of detecting miniature deformation, it is difficult to meet wearable device
Demand to wide deformation range.In addition to this, due to preparing high molecular material that flexible sensor uses in multiple complicated shape
Micro-crack is often generated during becoming, leads to the variation of sensor structure, so as to cause the deformation of sensing element, causes to sense
The biggish measurement error of device.
Summary of the invention
Of the existing technology in order to overcome the problems, such as, the purpose of the present invention is to provide a kind of graphene of energy self-healing is soft
Property sensor and preparation method thereof.
The technical solution used in the present invention is:
The present invention provides a kind of graphene flexible sensors of energy self-healing, and this sensor includes sensing element, electricity
Pole, conducting wire and self-healing flexible carrier, wherein sensing element and electrode are wrapped in self-healing flexible carrier, sensing element
Both ends are connected with electrode respectively, and conducting wire is connected with electrode and draws except self-healing flexible carrier；The sensing element is buckling
Graphene film, be to be formed smooth graphene film buckling using itself stress of self-healing flexible carrier.
Preferably, in the graphene flexible sensor of this energy self-healing, sensing element is the graphite of at least one layer of buckling
Alkene film.
Preferably, in the graphene flexible sensor of this energy self-healing, self-healing flexible carrier is by flexible material system
It is standby to form, self-healing flexible carrier prepare raw material include polyimides, dimethyl silicone polymer, polyester, in epoxy resin
It is at least one；It is further preferred that the raw material for preparing of self-healing flexible carrier includes polyimides, dimethyl silicone polymer, gathers
At least one of ethylene glycol terephthalate, polybutylene terephthalate, epoxy resin；Still further preferably, certainly
The raw material for preparing of healing flexible carrier includes dimethyl silicone polymer.
Preferably, in the graphene flexible sensor of this energy self-healing, the material of electrode is in aluminium, copper, silver, nickel
A kind of or its alloy；It is further preferred that electrode is selected from one of aluminium flake, copper sheet, silver strip, nickel sheet.
Preferably, it is this can self-healing graphene flexible sensor in, the material of conducting wire in copper, silver, nickel one
Kind or its alloy；It is further preferred that conducting wire is selected from one of copper wire, filamentary silver, nickel wire.
The present invention also provides the preparation method of the graphene flexible sensor of this energy self-healing, this energy self-healing
The preparation method of graphene flexible sensor the following steps are included:
1) the soft gel of flexible material is prepared using microcapsule method, by the soft gel solidification of flexible material, obtains flexible parent metal；
2) flexible parent metal is stretched around, smooth graphene film is then placed on the flexible parent metal of stretching；
3) make flexible parent metal self-healing, smooth graphene film is become to the graphene film of buckling, obtains sensing element
Part；
4) electrode is connected at sensing element both ends, then conducting wire is connected with electrode, be then poured flexibility made from step 1)
Material softer gel, solidification obtain the graphene flexible sensor of above-mentioned energy self-healing.
Preferably, in the preparation method step 1) and step 4) of the graphene flexible sensor of this energy self-healing, solidification
Refer to be 70 DEG C~90 DEG C in temperature at dry 1h~3h.
Preferably, in the preparation method step 1) of the graphene flexible sensor of this energy self-healing, microcapsule method preparation
The method of the soft gel of flexible material the following steps are included:
S1: urea is mixed with formalin, obtains prepolymer solution；
S2: vinyldimethicone and metallic catalyst are dissolved in solvent, and the copolymerization of ethylene maleic acid acid anhydride is added
Object solution, prepolymer solution, hybrid reaction add polyvinyl alcohol water solution, dry, and it is poly- to obtain Lauxite cladding vinyl
The microcapsules a of dimethyl siloxane and metallic catalyst；
S3: methyl polysilicone alkyl copolymer is dissolved in solvent, and it is molten that thylene maleic acid anhydride copolymer solution, performed polymer is added
Liquid, hybrid reaction add polyvinyl alcohol water solution, dry, obtain the micro- of Lauxite cladding methyl polysilicone alkyl copolymer
Capsule b；
S4: microcapsules a and microcapsules b are mixed in dimethyl silicone polymer, obtain the soft gel of flexible material.
It is further preferred that the specific method that microcapsule method prepares the soft gel of flexible material is in step 1):
S1: the urea of 0.5g~4g is mixed with the formalin that 2g~10g mass concentration is 30%~50%, is obtained pre-
Oligomer solution；
S2: by the metallic catalyst of the vinyldimethicone of 0.1g~4g and 0.01~0.3g be dissolved in 20mL~
In 120mL solvent, thylene maleic acid anhydride copolymer solution, the 1g~12g that 50mL~250mL mass concentration is 1%~7% is added
Prepolymer solution, hybrid reaction add 50mL~150mL polyvinyl alcohol water solution, dry, obtain Lauxite cladding ethylene
The microcapsules a of base dimethyl silicone polymer and metallic catalyst；
S3: the methyl polysilicone alkyl copolymer of 0.1g~3g is dissolved in 20mL~120mL solvent, and addition 50mL~
The prepolymer solution of thylene maleic acid anhydride copolymer solution, 1g~12g that 200mL mass concentration is 1%~7%, hybrid reaction,
50mL~150mL polyvinyl alcohol water solution is added, it is dry, obtain micro- glue of Lauxite cladding methyl polysilicone alkyl copolymer
Capsule b；
S4: microcapsules a and microcapsules b are mixed in dimethyl silicone polymer, obtain the soft gel of flexible material.
Still further preferably, in step 1), the specific method that microcapsule method prepares the soft gel of flexible material is:
S1: the urea of 1g~3g is mixed with the formalin that 5g~6g mass concentration is 35%~45%, obtains pre-polymerization
Liquid solution；
S2: by the metallic catalyst of the vinyldimethicone of 2g~3g and 0.1~0.2g be dissolved in 50mL~
In 100mL solvent, be added 100mL~200mL mass concentration be 3%~5% thylene maleic acid anhydride copolymer solution, 5g~
10g prepolymer solution, hybrid reaction add 80mL~120mL polyvinyl alcohol water solution, dry, obtain Lauxite cladding
The microcapsules a of vinyldimethicone and metallic catalyst；
S3: the methyl polysilicone alkyl copolymer of 0.5g~2g is dissolved in 50mL~100mL solvent, and addition 80mL~
The prepolymer solution of thylene maleic acid anhydride copolymer solution, 5g~10g that 120mL mass concentration is 3%~5%, hybrid reaction,
80mL~120mL polyvinyl alcohol water solution is added, it is dry, obtain micro- glue of Lauxite cladding methyl polysilicone alkyl copolymer
Capsule b；
S4: microcapsules a and microcapsules b are mixed in dimethyl silicone polymer, obtain the soft gel of flexible material.
Preferably, in the S2 of the preparation method step 1) of the graphene flexible sensor of this energy self-healing, metal catalytic
Agent is selected from least one of gold, platinum metal；Still further preferably, metallic catalyst in gold, platinum, palladium at least one
Kind.
Preferably, in the S2 and S3 of the preparation method step 1) of the graphene flexible sensor of this energy self-healing, mixing
Reaction is carried out under conditions of pH value is 2~3.5.
Preferably, in the S2 and S3 of the preparation method step 1) of the graphene flexible sensor of this energy self-healing, poly- second
The mass concentration of enol aqueous solution is 5%~20%；It is further preferred that the mass concentration of polyvinyl alcohol water solution be 8%~
12%.
Preferably, in the S2 and S3 of the preparation method step 1) of the graphene flexible sensor of this energy self-healing, solvent
Selected from least one of alcohols solvent, ether solvent, ketones solvent, esters solvent, amide solvent, hydrocarbon solvent；Again into
One step is preferred, and solvent is selected from least one of methanol, ethyl alcohol, ether, acetone, ethyl acetate, DMF, hexamethylene.
Preferably, the S4 polydimethylsiloxanes of the preparation method step 1) of the graphene flexible sensor of this energy self-healing
In alkane, the mass concentration of microcapsules a and microcapsules b are independently 1%~10%；It is further preferred that polydimethylsiloxanes
In alkane, the mass concentration of microcapsules a is 2%~8%, and the mass concentration of microcapsules a is 1%~5%.
Preferably, the S4 polydimethylsiloxanes of the preparation method step 1) of the graphene flexible sensor of this energy self-healing
In alkane, the mass ratio of microcapsules a and microcapsules b are (1.2~2): 1.
Preferably, it is this can self-healing graphene flexible sensor preparation method step 2) in, by flexible parent metal to
Surrounding stretching can be random stretching around；It is further preferred that the extensibility of flexible parent metal is 5%~80%；Again into one
Step is preferred, and the extensibility of flexible parent metal is 10%~30%.Here extensibility refers to the size after stretching relative to stretching
Preceding size growth rate, size Expressing length or width.
Preferably, in the preparation method step 2) of the graphene flexible sensor of this energy self-healing, graphene film is
It is made by chemical vapour deposition technique, or is made by graphene and/or graphene oxide solution film forming；Further,
Chemical vapour deposition technique be by carbon source (at least one of such as methane, ethylene, acetylene) metallic matrix (such as nickel, copper, in ruthenium
One kind or its alloy) on carry out chemical vapor deposition graphene film is made；Graphene and/or graphene oxide solution film forming
Preparing graphene film is specifically by graphene and/or graphene oxide solution spin coating or to filter film forming.
Preferably, it in the preparation method step 2) of the graphene flexible sensor of this energy self-healing, places smooth
The graphene film number of plies is at least one layer；It is further preferred that placing the smooth graphene film number of plies is 1 layer~10 layers；
Still further preferably, placing the smooth graphene film number of plies is 1 layer~5 layers.
Preferably, in the preparation method step 3) of the graphene flexible sensor of this energy self-healing, make flexible parent metal certainly
Restoring is specifically to remove drawing force, makes flexible parent metal ego resilience.
Preferably, in the preparation method step 4) of the graphene flexible sensor of this energy self-healing, sensing element and electricity
Pole is bonded by elargol.
Preferably, in the preparation method step 4) of the graphene flexible sensor of this energy self-healing, conducting wire is with electrode
It is bonded by elargol.
Preferably, in the preparation method step 4) of the graphene flexible sensor of this energy self-healing, it is poured flexible material
When soft gel, keep conducting wire exposed.
The beneficial effects of the present invention are:
Sensor structure provided by the invention is simple, easy to use, and deformation range is big, high sensitivity, can be to itself crackle
It destroys and carries out self healing, the fields such as bio-robot, man-made electronic's skin, flexible wearable device can be widely applied.
Specifically:
1, in conventional flex sensor during multiple Reusability, it will lead to its flexible base material and generate fine fisssure
Line, so as to cause sensor to the detection error of detection signal.And the self-healing polymer-based end that the present invention uses, it can be in fine fisssure
When line generates, rapid self-regeneration avoids the decline of sensor performance.
2, smooth graphene film is become the graphene film of buckling using simple method by the present invention, as sensing
Element.Which greatly increases the deformation ranges of sensing element, expand the detection range of sensing element.Simultaneously as using
Grapheme material has excellent electric property, the variation of membrane structure can be driven minimum deformation, causes resistance
Variation, that is, possess higher sensitivity.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the graphene flexible sensor of energy self-healing of the invention；
Fig. 2 is the preparation flow schematic diagram of inventive sensor；
Fig. 3 is sensitivity curve figure of 1 sensor of embodiment under different stretch strain.
Specific embodiment
Attached drawing 1 is the structural schematic diagram of the graphene flexible sensor of present invention energy self-healing.In Fig. 1,1- sensor member
Part；2- electrode；3- conducting wire；4- self-healing flexible carrier.The figure only indicates a kind of example of sensor structure of the present patent application, but
The sensor structure of the present patent application is not limited only to structure type shown in Fig. 1.
Referring to Fig.1, the graphene flexible sensor of self-healing include 1, two electrode 2 of sensing element, two open traverses 3 and
Self-healing flexible carrier 4.Wherein, sensing element 1 is the graphene film of buckling, and two electrodes 2 are bonded in sensing by elargol
The both ends of element 1, two open traverses 3 are connected with elargol with two electrodes 2 respectively and to drawing except self-healing flexible carrier 4.It passes
Sensing unit 1, which is completely sealed, is wrapped in 4 middle part of self-healing flexible carrier.Meanwhile the sensing element 1 of the graphene film of buckling is
Smooth graphene film buckling is formed using itself stress of self-healing flexible carrier.
Due to the graphene film that sensing element 1 is buckling, under lesser pressure, structure can also generate faint knot
Structure variation, resistance can also change therewith, so that lesser pressure signal is converted to electric signal.Meanwhile the stone of buckling
Black alkene film can generate biggish deformation, therefore can also detect biggish deformation signal.
In addition, self-healing flexible carrier 4 can carry out self-regeneration when micro-crack occurs in sensor, greatly guarantee sensor
Stability.
Attached drawing 2 is the preparation flow schematic diagram of inventive sensor.Referring to Fig. 2, by specific embodiment to this
The content of invention is described in further detail.Raw material used in embodiment unless otherwise specified, can be from routine business way
Diameter obtains.
Embodiment 1
The graphene flexible sensor of this example energy self-healing the preparation method is as follows:
Step 1) prepares self-healing flexible material using microencapsulation: 3g urea is mixed with the 40wt% formalin of 5g,
Obtain performed polymer aqueous solution；The vinyldimethicone of 2g and 0.1g platinum catalyst are dissolved in 50mL hexamethylene, added
Enter the 3wt% thylene maleic acid anhydride copolymer of 100mL, performed polymer made from 5g, high-speed stirred dispersion.Adjust pH value of reaction system
It is 3, polymerization reaction occurs, and the PVA aqueous solution that 100mL concentration is 10% is added, is washed with distilled water product, it is dry, it obtains
The microcapsules a of Lauxite cladding vinyldimethicone and metallic catalyst；The polymethyl siloxane of 1g is copolymerized
Object is dissolved in 50mL hexamethylene, and the 3wt% thylene maleic acid anhydride copolymer of 100mL, performed polymer made from 5g, high-speed stirred is added
Dispersion.Adjusting pH value of reaction system is 3, and polymerization reaction occurs, and the PVA aqueous solution that 100mL concentration is 10% is added, with distillation
Water washing product, it is dry, obtain the microcapsules b of Lauxite cladding methyl polysilicone alkyl copolymer；By the microcapsules a of 5wt%
It is blended in dimethyl silicone polymer with the microcapsules b of 3wt%, obtains uncured soft gel.Uncured soft gel is taken to exist
80 DEG C of dry 2h, the self-healing underlying substrate after being solidified.2wt%NaOH and/or HCl can be used by adjusting pH value.
Step 2) stretches the self-healing underlying substrate after solidifying obtained by step 1), extensibility 20% around.Then
3 layers of smooth graphene film is placed on above.
Step 3) in the self-healing underlying substrate recuperation of tensional state, drives smooth graphene film to become buckling
Graphene film, i.e. sensing element.
Step 4) is bonded copper electrode with elargol at sensing element both ends, and copper wire conducting wire is be bonded with copper electrode elargol
It is connected, finally the uncured soft gel (i.e. flexible base material) obtained by sensing element upper step 1), in 80 DEG C of dryings
2h curing molding is entirely sealed in sensing element in self-healing flexible substrates, and the graphene flexible sensing of this example can be obtained
Device.
Embodiment 2
The graphene flexible sensor of this example energy self-healing the preparation method is as follows:
Step 1) prepares self-healing flexible material using microencapsulation: 2g urea is mixed with the 40wt% formalin of 6g,
Obtain performed polymer aqueous solution；The vinyldimethicone of 3g and 0.2g platinum catalyst are dissolved in 100mL hexamethylene, added
Enter the 3wt% thylene maleic acid anhydride copolymer of 200mL, performed polymer made from 8g, high-speed stirred dispersion.Adjust pH value of reaction system
It is 3, polymerization reaction occurs, and the PVA aqueous solution that 100mL concentration is 10% is added, is washed with distilled water product, it is dry, it obtains
The microcapsules a of Lauxite cladding vinyldimethicone and metallic catalyst；The polymethyl siloxane of 2g is copolymerized
Object is dissolved in 100mL hexamethylene, and the 3wt% thylene maleic acid anhydride copolymer of 100mL, performed polymer made from 8g, high-speed stirring is added
Mix dispersion.Adjusting pH value of reaction system is 3, and polymerization reaction occurs, and the PVA aqueous solution that 100mL concentration is 10% is added, with steaming
Distilled water washed product, it is dry, obtain the microcapsules b of Lauxite cladding methyl polysilicone alkyl copolymer；By the microcapsules of 3wt%
The microcapsules b of a and 2wt% is blended in dimethyl silicone polymer, obtains uncured soft gel.Uncured soft gel is taken to exist
80 DEG C of dry 2h, the self-healing underlying substrate after being solidified.2wt%NaOH and/or HCl can be used by adjusting pH value.
Step 2) stretches the self-healing underlying substrate after solidification around, extensibility 10%.Then flat by 5 layers
Whole graphene film is placed on above.
Step 3) and step 4) are the same as embodiment 1.
Embodiment 3
The graphene flexible sensor of this example energy self-healing the preparation method is as follows:
Step 1) prepares self-healing flexible material using microencapsulation: 1g urea is mixed with the 40wt% formalin of 5g,
Obtain performed polymer aqueous solution；The vinyldimethicone of 2g and 0.2g platinum catalyst are dissolved in 50mL hexamethylene, added
Enter the 5wt% thylene maleic acid anhydride copolymer of 100mL, performed polymer made from 10g, high-speed stirred dispersion.Adjust reaction system pH
Value is 3, and polymerization reaction occurs, and the PVA aqueous solution that 100mL concentration is 10% is added, and is washed with distilled water product, dry, is obtained
To the microcapsules a of Lauxite cladding vinyldimethicone and metallic catalyst；By the polymethyl siloxane of 0.5g
Copolymer is dissolved in 50mL hexamethylene, and the 5wt% thylene maleic acid anhydride copolymer of 100mL is added, and performed polymer made from 10g is high
Speed is dispersed with stirring.Adjusting pH value of reaction system is 3, and polymerization reaction occurs, and the PVA aqueous solution that 100mL concentration is 10% is added,
It is washed with distilled water product, it is dry, obtain the microcapsules b of Lauxite cladding methyl polysilicone alkyl copolymer；By the micro- of 2wt%
The microcapsules b of capsule a and 1wt% are blended in dimethyl silicone polymer, obtain uncured soft gel.It takes uncured soft solidifying
Self-healing underlying substrate of the glue in 80 DEG C of dry 2h, after being solidified.2wt%NaOH and/or HCl can be used by adjusting pH value.
Step 2) stretches the self-healing underlying substrate after solidification around, extensibility 30%.Then flat by 2 layers
Whole graphene film is placed on above.
Step 3) and step 4) are the same as embodiment 1.
Comparative example 1
The graphene flexible sensor of this example the preparation method is as follows:
Step 1) stretches the substrate after the soft gel solidification of pure dimethyl silicone polymer around, extensibility 20%.So
3 layers of smooth graphene film is placed on above afterwards.
Step 2) in the underlying substrate recuperation of tensional state, drives smooth graphene film to become buckling graphene
Film, i.e. sensing element.
Step 3) is bonded copper electrode with elargol at sensing element both ends, and copper wire conducting wire is be bonded with copper electrode elargol
It is connected, finally in the uncured pure soft gel of dimethyl silicone polymer of sensing element upper, in 80 DEG C of dry 2h curing moldings,
It is entirely sealed in sensing element in flexible substrates, the graphene flexible sensor of this example can be obtained.
Attached drawing 3 shows sensitivity curve figure of 1 sensor of embodiment under different stretch strain.Different stretch strains
Refer to the variation before stretching and after stretching on length direction.From figure 3, it can be seen that sensor of the invention has highly sensitive and width
The sensing capabilities of range ability.
The sensor of Examples 1 to 3 and comparative example 1 is passed through 500 times simultaneously after bending repeatedly, Examples 1 to 3 and comparison
The sensor of example 1 is all cracked, and specific test situation is shown in Table 1.Healing rate calculation formula in table 1 is as follows:
The crack length that healing rate (%)=(crack length after crack length-healing that bending occurs)/bending occurs
The sensor test results of table 1 Examples 1 to 3 and comparative example 1
| Project | Bend the crack length occurred | The time healed | The length of crackle after healing | Healing rate |
| Embodiment 1 | 2.5mm | After 5min | 0.1mm | 96.0% |
| Embodiment 2 | 2.1mm | After 5min | 0.2mm | 90.5% |
| Embodiment 3 | 1.6mm | After 5min | 0.1mm | 93.8% |
| Comparative example 1 | 2.8mm | - | - | - |
As seen from Table 1, for for the sensor of embodiment 1, although there is fine crack, it is then able to self-healing.
Specific and right, the length of crackle is 2.5mm, after 5min, self-healing occurs, crack length is 0.1mm after healing, and healing rate is
2.4/2.5=96%.For the sensor of comparative example 1, cracked length is 2.8mm, is not healed after 24 hours.
Crackle will change the performance of sensor, influence the consistency of sensor.It is compared relative to made from conventional method
Example, the self-healing sensor that the present invention is prepared by microcapsule method will quickly occur to heal automatically when crackle generates,
Its stability effectively improves.
Claims (10)
1. a kind of graphene flexible sensor of energy self-healing, including sensing element, electrode, conducting wire and self-healing flexible carrier,
It is characterized by: the sensing element and electrode are wrapped in self-healing flexible carrier, the both ends of sensing element respectively with electrode
It is connected, conducting wire is connected with electrode and draws except self-healing flexible carrier；The sensing element is the graphene film of buckling, is
Smooth graphene film buckling is formed using itself stress of self-healing flexible carrier.
2. a kind of graphene flexible sensor of energy self-healing according to claim 1, it is characterised in that: the sensing element
Part is the graphene film of at least one layer of buckling.
3. a kind of graphene flexible sensor of energy self-healing according to claim 1, it is characterised in that: the self-healing
The raw material for preparing of flexible carrier includes at least one of polyimides, dimethyl silicone polymer, polyester, epoxy resin.
4. the preparation method of the graphene flexible sensor of any one of claims 1 to 3 energy self-healing, it is characterised in that:
The following steps are included:
1) the soft gel of flexible material is prepared using microcapsule method, by the soft gel solidification of flexible material, obtains flexible parent metal；
2) flexible parent metal is stretched around, smooth graphene film is then placed on the flexible parent metal of stretching；
3) make flexible parent metal self-healing, smooth graphene film is become to the graphene film of buckling, obtains sensing element；
4) electrode is connected at sensing element both ends, then conducting wire is connected with electrode, be then poured flexible material made from step 1)
Soft gel, solidification obtain the graphene flexible sensor of energy self-healing.
5. the preparation method according to claim 4, it is characterised in that: in step 1) and step 4), solidification refers in temperature
It is dry 1h~3h at 70 DEG C~90 DEG C.
6. the preparation method according to claim 4, it is characterised in that: in step 1), it is soft that microcapsule method prepares flexible material
The method of gel the following steps are included:
S1: urea is mixed with formalin, obtains prepolymer solution；
S2: vinyldimethicone and metallic catalyst are dissolved in solvent, and it is molten that thylene maleic acid anhydride copolymer is added
Liquid, prepolymer solution, hybrid reaction add polyvinyl alcohol water solution, dry, obtain the Lauxite cladding poly- diformazan of vinyl
The microcapsules a of radical siloxane and metallic catalyst；
S3: methyl polysilicone alkyl copolymer is dissolved in solvent, and thylene maleic acid anhydride copolymer solution, prepolymer solution is added,
Hybrid reaction adds polyvinyl alcohol water solution, dry, obtains the microcapsules of Lauxite cladding methyl polysilicone alkyl copolymer
b；
S4: microcapsules a and microcapsules b are mixed in dimethyl silicone polymer, obtain the soft gel of flexible material.
7. preparation method according to claim 6, it is characterised in that: in step 1), it is soft that microcapsule method prepares flexible material
The specific method of gel is:
S1: the urea of 0.5g~4g is mixed with the formalin that 2g~10g mass concentration is 30%~50%, obtains performed polymer
Solution；
S2: by the metallic catalyst of the vinyldimethicone of 0.1g~4g and 0.01~0.3g be dissolved in 20mL~
In 120mL solvent, thylene maleic acid anhydride copolymer solution, the 1g~12g that 50mL~250mL mass concentration is 1%~7% is added
Prepolymer solution, hybrid reaction add 50mL~150mL polyvinyl alcohol water solution, dry, obtain Lauxite cladding ethylene
The microcapsules a of base dimethyl silicone polymer and metallic catalyst；
S3: the methyl polysilicone alkyl copolymer of 0.1g~3g is dissolved in 20mL~120mL solvent, and 50mL~200mL matter is added
The prepolymer solution of thylene maleic acid anhydride copolymer solution, 1g~12g that concentration is 1%~7% is measured, hybrid reaction adds
50mL~150mL polyvinyl alcohol water solution, it is dry, obtain the microcapsules b of Lauxite cladding methyl polysilicone alkyl copolymer；
S4: microcapsules a and microcapsules b are mixed in dimethyl silicone polymer, obtain the soft gel of flexible material.
8. preparation method according to claim 7, it is characterised in that: in the S2 of step 1), metallic catalyst is selected from gold, platinum
It is at least one of metal.
9. preparation method according to claim 7, it is characterised in that: in the S2 and S3 of step 1), hybrid reaction is in pH
Value carries out under conditions of being 2~3.5.
10. preparation method according to claim 7, it is characterised in that: in the S4 dimethyl silicone polymer of step 1), micro- glue
The mass concentration of capsule a and microcapsules b are independently 1%~10%.
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| CN111521106A (en) * | 2020-03-09 | 2020-08-11 | 江苏柔世电子科技有限公司 | Resistance type strain sensor |
| CN111928770A (en) * | 2020-07-29 | 2020-11-13 | 青岛菲灿新材料科技服务有限责任公司 | Two-dimensional net-shaped graphene-based tensile strain sensor and preparation method thereof |
| CN112964282A (en) * | 2019-12-13 | 2021-06-15 | 北京联合大学 | Intelligent graphene flexible electronic skin and preparation method thereof |
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