CN109826503B - Self-driven hyperelastic cipher disk with arbitrary curve adaptability and preparation method thereof - Google Patents
Self-driven hyperelastic cipher disk with arbitrary curve adaptability and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a self-driven hyperelastic cipher disk with any curved surface adaptability and a preparation method thereof, wherein the cipher disk comprises: a substrate layer, a conductive fluid electrode layer, an encapsulation layer; the plurality of fluid conductive electrodes are arranged on the substrate layer, the substrate layer and the conductive fluid electrode layer are packaged by the packaging layer, and the substrate layer and the packaging layer are made of ECOFLEX series silicone rubber; the device has superelasticity and flexibility, can be completely attached to any complex curved surface such as human skin, and has good biocompatibility and comfort.
Description
Technical Field
The invention relates to the technical field of cipher disks, in particular to a self-driven super-elastic cipher disk with arbitrary curved surface adaptability and a preparation method thereof.
Background
The cipher disk is a man-machine interaction device widely applied to the field of security. In fact, information has been compiled using cryptography as early as the ancient roman era. With the rapid development of modern electronic products, the code disc technology has higher requirements in the fields of national defense security and service industries such as communication, traffic, industry and commerce. As an encryption tool, how to implement a portable combination disk with low power consumption has become a difficulty in the research field.
The traditional mechanical password disk is complex in manufacturing process, and each component is usually made of metal, plastic and other materials, so that the whole device is rigid, heavy and inconvenient to carry. For example, the Chinese patent application with the application number of CN201810964548.6 discloses an inner disc of a password disc of a mechanical digital lock, wherein the inner disc comprises a disc body and a movable toggle device, the process is complicated, and the period is long; for example, chinese patent application No. 201820282333.1 discloses a metal password keyboard. The existing touch screen type password disk is portable and flexible, but still has the problems of high power consumption, complex manufacturing process and the like. For example, the chinese patent application with patent number CN101813992A discloses a touch screen and a password input method thereof. And aiming at a large number of emerging wearable electronic devices and equipment, the technology for developing the password disk with any curved surface adaptability has wide application prospect. The document [ Kai Dong, Zhoyi Wu.A Stretchable Yarn Embedded Triboelectrically Nanogenator as Electronic Skin for biomedical Energy Harvesting and multifunctionality Pressure sensing. adv.Mater.2018,1804944] proposes a flexible code disc technology based on Embedded conductive yarns, but cannot realize code disc devices with superelasticity due to the inextensible physical properties of the conductive yarns themselves.
Disclosure of Invention
The invention provides a self-driven cipher disk with any curved surface adaptability and a preparation method thereof for the first time, and the realized device has super elasticity and flexibility, can be completely attached to any complex curved surface such as human skin, and has good biocompatibility and comfort. In addition, the device has a self-driving characteristic, and can directly convert external mechanical input into an electric signal, so that the self-generating and self-supplying characteristics are realized. Therefore, the present invention exhibits a wide range of potential applications in the field of wearable electronics.
In addition, the invention also provides a preparation method of the self-driven hyperelastic cipher disk with any curved surface adaptability.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a self-driven superelastic code disk with arbitrary curvature adaptability includes a superelastic substrate, a conductive fluid electrode, and a superelastic encapsulation layer.
Preferably, the superelastic substrate and superelastic encapsulation layer are ECOFLEX series silicone rubber.
The ECOFLEX series silicone rubber is an ultra-soft platinum silicone rubber which can be naturally cured at room temperature, has small shrinkage, low viscosity, good fluidity and excellent high temperature resistance, and the temperature can reach 300-500 ℃. Most importantly, the cured silicone rubber is very soft, very strong, very "elastic", stretches several times its original size without tearing, and springs back to its original shape without deforming; high tensile strength, tear resistance and more times of die turnover.
Preferably, the conductive fluid electrode adopts carbon nano tube/silicon rubber composite conductive fluid.
Carbon Nanotubes (CNTs), the unique structure of which determines their many specific physical and chemical properties. Based on the performance characteristics of the CNT such as great length-diameter ratio, excellent mechanical strength, good electric and heat conductivity and the like. When appropriate proportions of CNTs are added to the silicone rubber as reinforcing agents, the composite will compromise the superior properties of CNTs and silicone rubber.
Preferably, the silicone rubber is an ECOFLEX series silicone rubber.
The single key unit of the super-elastic password disk is also a self-driven friction nanometer generator.
The self-driven friction nano generator can effectively convert mechanical energy into electric energy based on the combination of the friction electrification effect and the electrostatic induction. The friction nano generator is used as an energy generating unit, and the working mechanism is as follows: in the internal structure, due to contact electrification, charge transfer can occur between two friction material thin layers with different triboelectric polarities, so that a potential difference is formed between the two friction material thin layers; in an external circuit, electrons flow between two electrodes respectively stuck on the back surface of the triboelectric material layer or between the electrodes and the ground under the driving of a potential difference, so that current is formed to generate an electric signal.
The superelastic cipher disk of the present invention has each keyboard unit comprising a friction unit, a conductive electrode and a superelastic substrate.
The friction unit comprises a first friction layer and a second friction layer; after the first friction layer and the second friction layer are mutually rubbed, the first friction layer is positively charged, and the second friction layer is negatively charged; the conductive fluid electrode is mounted on the substrate, and the friction unit encapsulates the conductive fluid electrode and the substrate. The first friction layer is a packaging layer, and the second friction layer is human skin. The conductive fluid electrode is a carbon nano tube/silicon rubber composite conductive fluid and is positioned between the first friction layer and the substrate, and the packaging layer and the substrate are prepared from ECOFLEX series silicon rubber.
The working principle of each key unit of the superelastic cipher disk of the invention is as follows: electric energy is generated based on the combined action of contact electrification and electrostatic induction. In an initial state, the second triboelectric layer-skin and the first triboelectric layer-silicone rubber surface are in close contact with each other, resulting in charge transfer between the two. It was experimentally verified that silicone rubber is more accessible to electrons than skin during rubbing, and thus electrons on the skin are injected into the silicone rubber membrane, which is the contact strip process. The resulting triboelectric charges are of opposite polarity and are just balanced by each other, so that no current flows in the external circuit. These triboelectric charges are not compensated once the silicone rubber and the skin are relatively separated. The negative charge on the surface of the silicon rubber can induce positive charge on the carbon nano tube/silicon rubber composite conductive fluid electrode, so that free electrons are driven to flow from the carbon nano tube/silicon rubber composite conductive fluid electrode to the ground. This electrostatic induction process can generate a voltage/current signal. With the increasing separation distance between the skin and the silicon rubber, when the negative charges on the silicon rubber are completely shielded by the positive charges induced on the carbon nanotube/silicon rubber composite conductive fluid electrode, the TENG will not output a signal. In addition, when the skin returns to be close to the silicon rubber film, electrons flow to the carbon nano tube/silicon rubber composite conductive fluid electrode from the ground, and simultaneously positive charges induced on the carbon nano tube/silicon rubber composite conductive fluid electrode are reduced, so that a reverse output voltage/current signal is obtained. This is the whole process of generating electricity by the nanometer generator.
In order to realize the super-elastic cipher disk, the invention adopts the following preparation method:
(1) preparation of superelastic substrates
ECOFLEX series silicon rubber is adopted, and is manufactured by 3D printing of a mold 1 and then reverse molding.
Specifically, a die 1 is drawn through SOLIDWORKS drawing software, the peripheral size of the die 1 is 60mm multiplied by 3mm, the groove size is 50mm multiplied by 2mm, 9 cube protrusions are distributed in the groove in an array mode, the size of each protrusion is 10mm multiplied by 2mm, the interval between each cube protrusion and each protrusion is 5mm, and the interval between each cube protrusion and the edge of the groove is 5 mm; the mold 1 is printed by a high precision 3D printer.
Then, the mass ratio of the components is 3A: 1B to 1A: 3B to obtain liquid silicon rubber, pouring the silicon rubber solution into a mould 1 after vacuum defoaming, and naturally curing at room temperature (23 ℃, 4 h). In order to represent the excellent physical properties of the silicone rubber to the maximum extent, after the silicone rubber is subjected to mould reversing, the silicone rubber is subjected to post-curing treatment and is placed in an oven at 80 ℃ for 2 hours and then in an oven at 100 ℃ for 1 hour.
(2) Preparation of carbon nanotube/silicone rubber composite conductive fluid
1CNT (carbon nanotube): 17 silicone rubber-1 CNT: 10 silicon rubber is evenly mixed to prepare the silicon rubber. The preparation method specifically comprises the following steps:
step 1: putting 45-47 mt% of silicone rubber Part A solution into a beaker, putting a magnetic rotor, putting the beaker on a magnetic stirrer, and stirring the Part A solution for 3-5 min at a certain rotating speed.
Step 2: taking 6-10 mt% CNT.
And step 3: slowly adding CNT into the Part A solution in the step 1. On average, 0.01g of CNT was added each time, and when the CNT was completely dissolved in Part A solution, 0.01g of CNT was added again.
And 4, step 4: and (5) repeating the step (3).
As the CNT is increased, the solution in the beaker becomes gradually viscous and the dissolution rate of the CNT into the mixed solution is reduced, so that the rotation speed of the magnetic stirrer needs to be increased continuously to ensure that the CNT can be dissolved into the mixed solution.
And 5: the rotating speed of the magnetic stirrer is improved.
Step 6: and (5) repeating the step (3).
When 25% -50% of the taken CNT is mixed in the mixed solution, the CNT can not be effectively dissolved by increasing the rotating speed of the magnetic stirrer, so that a proper amount of silicon rubber Part B solution needs to be added to dilute the mixed solution to a certain degree.
And 7: adding 10 mt% -15 mt% of silicon rubber Part B solution.
And 8: and (5) repeating the step.
And step 9: and (5) repeating the step 3, and repeating the step 5 and the step 7 when the mixed solution is too viscous.
Step 10: and (4) repeating the step 9 until the silicone rubber Part B with the total content of 45mt to 47mt percent is added into the mixed solution. In the process, the rotating speed of the magnetic stirrer is increased by a certain gradient until the rotating speed reaches the maximum rotating speed.
Step 11: the remaining CNTs were slowly added and the mixed solution was stirred at the highest rotational speed.
Step 12: and after all the taken CNTs are dissolved in the mixed solution, continuously stirring the mixed solution by using a magnetic stirrer until the mixed solution is uniformly mixed for about 10-20 hours.
(3) Preparation of super-elastic packaging layer film
ECOFLEX series silicon rubber is adopted, and is manufactured by 3D printing of a mold 2 and then reverse molding.
Specifically, the mold 2 is firstly drawn by SOLIDWORKS drawing software, the peripheral dimension of the mold 2 is 60mm × 60mm × 2mm, the groove dimension is 50mm × 50mm × 1mm, and the mold 2 is printed by a high-precision 3D printer.
Then, the mass ratio of the components is 3A: 1B to 1A: 3B to prepare liquid silicon rubber, pouring the solution into a mould 2 after vacuum defoaming, and naturally curing at room temperature (23 ℃, 4 h). In order to represent the excellent physical properties of the silicone rubber to the maximum extent, after the silicone rubber is subjected to mould reversing, the silicone rubber is subjected to post-curing treatment and is placed in an oven at 80 ℃ for 2 hours and then in an oven at 100 ℃ for 1 hour.
(4) Making superelastic cipher disk
Specifically, firstly, a hyperelastic substrate is flatly placed on a glass table; taking a proper amount of carbon nano tube/silicon rubber composite conductive fluid, respectively filling 9 cube grooves of the hyperelastic substrate, and slightly flattening by using a glass rod;
then, taking a small amount of silicon rubber solution, and fully distributing the edges of the super-elastic substrate and the edges of the grooves; lightly attaching the super-elastic packaging layer film to the surface of the super-elastic substrate and the carbon nano tube/silicon rubber composite conductive fluid;
and finally, placing the silicon rubber solution in an oven, and quickly drying the silicon rubber solution on each edge.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the ECOFLEX series silicon rubber is used as the substrate and the first friction electrification layer/packaging layer, so that the device has the super-elasticity characteristic, and the manufacturing process is simple, the material consumption is low, the price is low, and the ECOFLEX series silicon rubber is suitable for large-scale production.
2. The invention adopts the carbon nano tube/silicon rubber composite conductive fluid as the electrode for the first time, and the fluid-shaped composite conductive material is wrapped between the first triboelectrification/superelasticity film packaging layer and the superelasticity substrate, so that the conductive material has good conductivity, the electrode part can be infinitely stretched, and the strain range of the whole device cannot be influenced.
3. The self-driven password disk has the adaptability to any curved surface, and can be attached to any complex curved surface, such as human skin. Besides, the good biocompatibility and comfort are achieved, and potential application of the novel medical dressing to wearable electronic equipment is demonstrated.
4. The cipher disk is a self-driven cipher disk based on the principle of a friction nano generator, and has good electrical property output. Experiments prove that the mechanical lock can be successfully unlocked.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention;
FIG. 1 is a perspective view of a self-driven superelastic code disk with arbitrary curvature compliance;
FIG. 2 is an exploded view of a self-driven superelastic code disk with arbitrary curvature compliance;
FIG. 3 is an exploded view of a single key unit;
4-5 are schematic diagrams of electrical performance output of a single key unit of the combination disk when the single key unit is knocked;
fig. 6 is a block circuit diagram of a combination disk unlocking mechanical lock.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflicting with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described and thus the scope of the present invention is not limited by the specific embodiments disclosed below.
Example (b):
referring to fig. 1-6, the present application provides a self-driven superelastic code disk with arbitrary curvature compliance, the code disk comprising:
a substrate layer, a conductive fluid electrode layer, an encapsulation layer; the plurality of conductive fluid electrodes are arranged on the substrate layer, the substrate layer and the conductive fluid electrode layer are packaged by the packaging layer, and the substrate layer and the packaging layer are made of ECOFLEX series silicone rubber.
In the embodiment of the present application, the conductive fluid electrode uses a carbon nanotube/silicone rubber composite conductive fluid.
In the embodiment of the application, the carbon nanotube is a multi-walled carbon nanotube, the diameter of the multi-walled carbon nanotube is 10-20nm, and the length of the multi-walled carbon nanotube is 0-30 muA.
Wherein, in the embodiment of the application, the silicon rubber is ECOFLEX 00-30.
In the embodiment of the application, the password disk is provided with a plurality of key units, and each key unit is a self-driven nanometer generator.
Wherein, in this application embodiment, keyboard unit includes: a friction unit, a conductive fluid electrode, and a substrate; the friction unit comprises a first friction layer and a second friction layer; after the first friction layer and the second friction layer are mutually rubbed, the first friction layer is positively charged, and the second friction layer is negatively charged; the conductive fluid electrode is mounted on the substrate, and the first friction layer encapsulates the conductive fluid electrode and the substrate.
In the embodiment of the present application, the first friction layer is a film encapsulation layer, and the second friction layer is human skin.
In the embodiment of the application, the conductive fluid electrode is a carbon nano tube/silicon rubber composite conductive fluid and is positioned between the first friction layer and the packaging layer, and the film of the film packaging layer and the substrate are prepared from ECOFLEX 00-30 silicon rubber.
The preparation method of the self-driven hyperelastic cipher disk with any curved surface adaptability comprises the following steps:
1. preparation of superelastic substrate and superelastic encapsulation layer films
(1) Preparation of ECOFLEX 00-30 Silicone rubber solution: 6.053g of EOFLEX 00-30Part A solution is put in a plastic culture dish and stirred for 1min by a glass rod; adding 3.037g of EOFLEX 00-30Part B solution, and uniformly stirring for 3 min;
(2) vacuum defoaming treatment: flatly placing the plastic culture dish filled with the ECOFLEX 00-30 silicone rubber solution in a vacuum box, opening a switch, and removing bubbles in vacuum for 2 min;
(3) and (3) reversing the mold: horizontally placing the mold 1 and the mold 2 on a table, pouring the ECOFLEX 00-30 silicone rubber solution subjected to vacuum defoaming into the mold 1 and the mold 2, and flattening the glass rod;
(4) curing treatment: placing the ECOFLEX 00-30 silicon rubber solution after the die-pouring at room temperature for natural curing, and keeping the temperature at 23 ℃ for 4 h;
(5) post-curing treatment: placing the naturally cured ECOFLEX 00-30 silicon rubber solution in an oven at 80 ℃ for 2 h; then, the temperature is increased to 100 ℃ for 1 h;
(6) guiding a mold: and (3) slightly stripping the cured ECOFLEX 00-30 silicon rubber from the die 1 and the die 2 by using tweezers.
2. Preparation of carbon nanotube/silicone rubber composite conductive fluid
(1) 7.510g of ECOFLEX 00-30Part A solution is placed in a 50ml beaker, a magnetic rotor is placed in the beaker, the beaker is placed on a constant temperature magnetic stirrer, and the Part A solution is uniformly stirred for 3min at the rotating speed of 500 rpm.
(2) Weighing 1.006g CNT;
(3) increasing the rotating speed of the constant-temperature magnetic stirrer to 800 rpm;
(4) slowly adding CNT into the beaker in the step (1). Adding 0.01g of CNT every time on average, and adding 0.01g of CNT again after the CNT is completely dissolved into the mixed solution;
(5) repeating (4);
(6) along with the continuous increase of the CNT, the mixed solution becomes more and more viscous, the speed of dissolving the CNT into the mixed solution is slower and slower, and at the moment, the rotating speed of the constant-temperature magnetic stirrer needs to be gradually increased to ensure that the CNT is effectively dissolved into the mixed solution.
(7) Repeating (4) and (6);
(8) when 0.272g of CNT is added into the mixed solution, the rotating speed of the constant-temperature magnetic stirrer is increased to 1000rpm, at the moment, 0.01g of CNT is dissolved into the mixed solution and is required to be stirred for 3min, the dissolving speed is very slow, and the rotating speed of the constant-temperature magnetic stirrer is continuously increased;
(9) repeating (4) and (6);
(10) when 0.402g of CNT is added into the mixed solution, the CNT can not be effectively dissolved by increasing the rotating speed of the constant-temperature magnetic stirrer, and at the moment, 1.674g of ECOFLEX 00-30Part B solution is weighed, and the mixed solution is diluted to a certain degree.
(11) Repeating the steps (4) and (6), wherein the rotating speed of the constant-temperature magnetic stirrer is increased to 1200 rpm;
as the CNT in the mixed solution is increased, the mixed solution becomes viscous again, the dissolution speed of the CNT becomes slower and slower, and therefore, the CNT and ECOFLEX 00-30Part B solution needs to be added repeatedly and alternately.
(12) When 0.490g of CNT is dissolved in the mixed solution, 1.495g of ECOFLEX 00-30Part B solution is added, at the moment, the rotating speed of a magnetic stirrer is 1300rpm, and (4) and (6) are repeated;
(13) when 0.573g of CNT has been dissolved in the mixed solution, 2.264g of ECOFLEX 00-30Part B solution is added, at this time, the rotation speed of the magnetic stirrer is 1400rpm, and (4), (6) is repeated;
(14) when 0.640g CNT is dissolved in the mixed solution, 2.097g ECOFLEX 00-30Part B solution is added, and at the moment, the ECOFLEX 00-30Part B solution is added, 7.530g is added in total;
(15) repeating (4) and (6);
(16) when the addition amount of the CNT is 0.680g, the rotating speed of the constant-temperature magnetic stirrer is increased to the maximum value 1720 rpm;
(17) repeating (4);
(18) after 1.001g of CNT is completely dissolved in the mixed solution, the rotation speed of the constant temperature magnetic stirrer is adjusted to 800rpm, and the stirring is carried out for 12 hours.
3. Making superelastic cipher disk
(1) Placing a super-elastic substrate with the size of 50mm multiplied by 2mm on a glass table-board flatly;
(2) taking a proper amount of carbon nanotube/silicone rubber composite conductive fluid, respectively filling 9 square grooves of the superelasticity substrate, averagely adding 0.1g of carbon nanotube/silicone rubber composite conductive fluid into each groove, and slightly flattening by using a glass rod;
(3) taking a small amount of ECOFLEX 00-30 solution, and fully distributing the edges of the super-elastic substrate and the edges of the grooves;
(4) gently attaching the super-elastic packaging layer film with the size of 50mm multiplied by 1mm to the surface of the super-elastic substrate and the carbon nano tube/silicon rubber composite conductive fluid;
(5) the ECOFLEX 00-30 solution on each edge is quickly dried and placed in an oven at 75 ℃ for 20 min.
4. Mechanical lock for unlocking password disk
(1) Designing a rear-end processing circuit of the password disk: the back-end processing circuit comprises four modules, namely a signal processing circuit, a multi-way gating circuit, an STM32 and a coded lock control circuit. As shown in fig. 6.
(2) An unlocking process: according to the working principle of the single key unit of the superelastic code disc, a finger strikes the single key unit to obtain an electric signal through a contact-separation working mode of skin and silicon rubber; because the electric signal is a pulse signal with high voltage and low current, and the internal resistance of a single key unit is large and is not matched with the impedance of the ADC module of the STM32, the electric signal needs to be accessed to a signal processing circuit module to be processed so as to ensure that the signal can be detected by the ADC module of the STM32, wherein the signal processing circuit module comprises an amplifying circuit and a low-pass filter circuit; the multi-path gating circuit module is positioned between the signal processing module and the STM32 module and controls the multi-path gating circuit through the STM32 module; and the ADC module of the STM32 samples the signal output by gating, the signal enters the coded lock control circuit module, and if a correct digital code is input, the STM32 outputs an effective signal to the coded lock control circuit, so that the terminal coded lock is opened.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (7)
1. A self-driven superelastic combination disk having arbitrary curvature compliance, said combination disk comprising:
a substrate layer, a conductive fluid electrode layer, an encapsulation layer; the plurality of conductive fluid electrodes are arranged on the substrate layer, the substrate layer and the conductive fluid electrode layer are packaged by the packaging layer, and the substrate layer and the packaging layer are made of ECOFLEX series silicone rubber;
the password disk is provided with a plurality of key units, and each key unit is a self-driven nano generator; the key unit includes: a friction unit, a conductive fluid electrode, and a substrate; the friction unit comprises a first friction layer and a second friction layer; after the first friction layer and the second friction layer are mutually rubbed, the first friction layer is positively charged, and the second friction layer is negatively charged; the conductive fluid electrode is mounted on the substrate, and the friction unit encapsulates the conductive fluid electrode and the substrate.
2. The self-driven superelastic code disk with arbitrary curvature compliance of claim 1 wherein the conductive fluid electrode is a carbon nanotube/silicone rubber composite conductive fluid.
3. The self-driven superelastic cipher disk with arbitrary curvature compliance of claim 2, wherein said silicone rubber is an ECOFLEX series silicone rubber.
4. The self-driven superelastic code disc according to claim 1, wherein the first friction layer is an encapsulation layer and the second friction layer is human skin.
5. The self-driven superelastic code disc according to claim 1, wherein the conducting fluid electrode is a carbon nanotube/silicone rubber composite conducting fluid disposed between the first friction layer and the substrate, and the encapsulation layer and the substrate are made from ECOFLEX series silicone rubber.
6. A method of making a self-driven superelastic code disc with arbitrary curvature compliance as in any of claims 1-5, comprising:
(1) preparing a substrate, wherein the substrate is made of ECOFLEX series silicon rubber through a 3D printing die and then reverse molding;
(2) preparing carbon nano tube/silicon rubber composite conductive fluid;
(3) preparing a packaging layer, namely preparing an ECOFLEX series silicon rubber through a 3D printing mold and then performing reverse molding;
(4) manufacturing a super-elastic password disk;
firstly, flatly placing a substrate on a table top; filling the grooves of the substrate with proper amount of carbon nanotube/silicone rubber composite conductive fluid, and flattening with a glass rod; then, taking a silicon rubber solution to fully distribute the edge of the substrate and the edge of each groove; attaching the packaging layer to the surface of the substrate and the carbon nano tube/silicon rubber composite conductive fluid; finally, the silicon rubber solution on each edge is dried in an oven.
7. The method of claim 6, wherein the Carbon Nanotube (CNT)/silicone rubber composite conductive fluid is prepared by mixing the following components in a weight ratio of 1 CNT: 17 silicone rubber-1 CNT: 10, uniformly mixing silicon rubber, and specifically adopting the following preparation steps:
step 1: putting 45-47 mt% of silicone rubber Part A solution into a beaker, putting a magnetic rotor, putting the beaker on a magnetic stirrer, and stirring the Part A solution for 3-5 min at a certain rotating speed;
step 2: taking 6-10 mt% of CNT;
and step 3: adding CNT into the Part A solution in the step 1; adding 0.01g of CNT every time on average, and adding 0.01g of CNT again after the CNT is completely dissolved into the Part A solution;
and 4, step 4: repeating the step 3;
and 5: the rotating speed of the magnetic stirrer is increased;
step 6: repeating the step 3;
and 7: adding 10-15 mt% of silicone rubber Part B solution;
and 8: repeating the step 5;
and step 9: repeating the step 3, and repeating the step 5 and the step 7 based on the viscosity of the mixed solution;
step 10: repeating the step 9 until the silicone rubber Part B with the concentration of 45 mt% -47 mt% is added into the mixed solution;
step 11: adding the rest CNT, and stirring the mixed solution at the highest rotating speed;
step 12: and after all the taken CNTs are dissolved in the mixed solution, continuously stirring the mixed solution by using a magnetic stirrer until the mixed solution is uniformly mixed.
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