High-sensitivity wide-response pressure-sensitive carbon nanosuspension, pressure-sensitive film and preparation method thereof

Abstract

The application discloses a kind of high-sensitivity wide-response pressure-sensitive carbon nano paste, pressure-sensitive film and preparation method thereof, belong to pressure-sensitive film technical field.The paste is prepared from the components including carbon nanomaterial, organic resin complex, dispersant aid, anti-settling agent, leveling agent, anti-drying agent and organic solvent, wherein the organic resin complex is formed by two different elastic modulus organic resins.The application is formed by compounding specific proportion of carbon nanomaterial with organic resin complex formed by two or more different elastic modulus organic resins, adding specific proportion of auxiliary agent, and then obtaining high-sensitivity wide-response pressure-sensitive carbon nano paste by nanodispersion technology, which has excellent dispersibility and anti-settling performance, and the pressure-sensitive film formed has high-sensitivity pressure-resistance response characteristics, high pressure coefficient, and wide pressure response range, which can be used for the development and preparation of pressure sensor.

Description

TECHNICAL FIELD

[0001] The present application relates to a pressure sensor material, in particular to a high-sensitivity wide-response pressure-sensitive carbon nanometer paste, a pressure-sensitive film and a preparation method thereof, and belongs to the technical field of sensor materials. BACKGROUND

[0002] With the continuous development of flexible intelligent electronic devices, flexible pressure sensors prepared by combining polymer substrates and conductive materials have attracted widespread attention. Flexible pressure sensors can cause connection or separation between conductive materials under external pressure, resulting in a decrease or increase in sensor resistance. Since the sensor can convert flexible material stretching or compression signals into electrical signals when pressure is applied, it has excellent external force sensing ability, high sensitivity, simple signal processing, low cost, and simple manufacturing process, and therefore has broad application prospects in wearable electronic products, health care, soft robots, human-computer interaction, artificial intelligence, environmental monitoring and other fields.

[0003] The existing technology for preparing flexible pressure sensors has a complex process and cannot be manufactured in large areas. For example, patent CN115165165B uses a fiber film as an intermediate interlayer, a polydimethylsiloxane flexible film as a top layer and a bottom layer for packaging, and the upper and lower layers are copper electrodes, which are separated by double-sided adhesive tape, to form a flexible pressure sensor. The fiber film is prepared by high-pressure near-field direct writing technology using polyvinylidene fluoride / carbon nanotube / isopentane@polyvinyl chloride expanded microspheres, and the isopentane@polyvinyl chloride expanded microspheres are synthesized by suspension polymerization and expanded by heating, with isopentane solution as the core and polyvinyl chloride as the shell. In patent CN114088254B, a conductive polymer solution is deposited onto a microstructure template and solidified into a conductive elastic polymer composite. The above existing technology for preparing flexible pressure sensors has very high requirements for equipment and substrates, is difficult to achieve universality, and is not easy to promote and apply. Therefore, there is an urgent need for new technology to solve this problem.

[0004] In view of the above technical problems, some researchers have proposed that a conductive material can be mixed with a polymer resin to form a composite material with conductive properties, which can then be applied to flexible pressure sensors. However, the composite materials prepared by the existing technology have some problems. Some have high sensitivity but narrow pressure response range, making them difficult to apply in fields with wide pressure response range requirements. Some have a wide pressure response range but low sensitivity, making the pressure sensing not sensitive enough. In summary, it is difficult to obtain a composite material that can balance the pressure response range and sensitivity and can be applied to flexible pressure sensors, especially film-based flexible pressure sensors, in the existing technology. SUMMARY

[0005] To solve the above technical problems, the application provides a high-sensitivity wide-response pressure-sensitive carbon nano paste, a pressure-sensitive film and a preparation method thereof.

[0006] The technical scheme of the application is:

[0007] The application provides a high-sensitivity wide-response pressure-sensitive carbon nano paste which is prepared from components including carbon nano materials, an organic resin composite, a dispersant aid, a sedimentation inhibitor, a leveling agent, a dry inhibitor and an organic solvent.

[0008] The total amount of the carbon nano materials and the organic resin composite accounts for 10-40% of the total solid mass fraction of the carbon nano paste, and the mass ratio of the carbon nano materials to the organic resin composite is (0.05-0.3):1.

[0009] The organic resin composite is formed by compounding an organic resin one with an elastic modulus of 0.005-2.0 Gpa and an organic resin two with an elastic modulus of 2.5-8.0 Gpa, and the mass ratio of the organic resin one to the organic resin two is (0.05-20):1. The organic resin one can be selected from one or more of polyacrylic resin, polyurethane resin, epoxy resin and thermoplastic elastomer; the organic resin two can be selected from one or more of phenolic resin, ABS resin, polyimide resin and polystyrene resin. The carbon nano materials can be selected from one or more of carbon nanotubes, graphene, conductive carbon black and carbon quantum dots.

[0010] The amount of the dispersant aid is 0.05-0.4 times the amount of the carbon nano materials. The dispersant aid can be selected from one or more of triethanolamine, hydrogenated castor oil, cyclohexanone, 1,4-butanediol, polyethylene glycol, p-isooctyl phenyl ether (triton), sodium dodecyl benzene sulfonate and sodium dodecyl sulfate.

[0011] The amount of the sedimentation inhibitor is 0.05-0.4 times the amount of the carbon nano materials. The sedimentation inhibitor can be selected from one or more of non-ionic polyoxyethylene fatty amine, non-ionic polyoxyethylene fatty alcohol, polyoxyethylene fatty alcohol sulfate, polyglycol ether and polyamide wax.

[0012] The amount of the leveling agent is 0.1-2.0 times the amount of the carbon nano materials. The leveling agent is a high-boiling-point solvent with a boiling point not lower than 140 DEG C, and can be preferably one or more of isophorone, diacetone alcohol, Solvesso 150 and dipropylene glycol methyl ether.

[0013] The amount of the dryness-preventing agent is 0.1-2.0 times of the amount of the carbon nanomaterial.

[0014] The organic solvent can be one or more of ethylene glycol dimethyl ether, propylene glycol methyl ether, tributyl citrate, propylene glycol methyl ether acetate, propylene glycol n-propyl ether, ethylene glycol ethyl ether acetate, dipropylene glycol dimethyl ether, dipropylene glycol methyl ether, dibasic acid ester DBE, dipropylene glycol propyl ether, and diethylene glycol butyl ether.

[0015] The application further provides a preparation method of the high-sensitivity wide-response pressure-sensitive carbon nanosize paste, which mainly comprises the following steps:

[0016] S1: dispersing organic resin I into an organic solvent at a solid mass fraction of 50%, and obtaining organic resin solution A by heating and stirring at 80-120 DEG C; dispersing organic resin II into an organic solvent at a solid mass fraction of 20%, and obtaining organic resin solution B by heating and stirring at 60-100 DEG C;

[0017] S2: slowly adding carbon nanomaterial, dispersant aid, anti-settling agent, organic resin solution A, organic resin solution B, leveling agent and dryness-preventing agent into a dispersion container in proportion at room temperature, and obtaining the high-sensitivity pressure-sensitive carbon nanosize paste by reverse dispersion for 8-9 hours by using a grinding device;

[0018] The grinding device can be one or more of a full-planet planetary ball mill, a vertical planetary ball mill, a horizontal planetary ball mill, a tank mill, a disc-type grinding device, a rotating shaft-type grinding device, a centrifugal grinding device and a three-roller grinding device, and the grinding speed is preferably 500-700 r / min.

[0019] The application further provides a high-sensitivity wide-response pressure-sensitive film, which is prepared from the high-sensitivity pressure-sensitive carbon nanosize paste, and the forming process can be screen printing or coating process.

[0020] The application has the following beneficial technical effects:

[0021] This invention involves compounding carbon nanomaterials in a specific ratio with an organic resin composite formed from two or more organic resins with different elastic moduli, adding a specific ratio of additives, and then processing the mixture using nano-dispersion technology to obtain a highly sensitive, wide-response pressure-sensitive carbon nanomaterial slurry. This slurry exhibits excellent dispersibility and anti-settling properties. Furthermore, this slurry can be used to form a resistive pressure-sensitive film on a substrate through screen printing, coating, or other processes. This film possesses highly sensitive pressure-resistance response characteristics, a high pressure sensitivity coefficient, and a wide pressure response range, making it suitable for the development and fabrication of pressure sensors. In particular, this slurry can achieve printing patterns with a maximum accuracy of ±10 μm on organic substrates through screen printing, enabling its application in the development and fabrication of high-performance flexible thin-film pressure sensors. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the pressure-resistance change rate response curves of the pressure-sensitive carbon paste in Examples 1-5 of the present invention;

[0023] Figure 2 The graph shows the sensitivity factor test data of carbon pressure-sensitive slurry 1 in different pressure ranges according to Embodiment 1 of the present invention.

[0024] Figure 3 Schematic diagram of the pressure-resistance change rate response curve of the pressure-sensitive carbon paste in Comparative Examples 1-2 of this invention;

[0025] Figure 4 This is a schematic diagram of the structure of the silver electrode layer in a specific embodiment of the present invention;

[0026] Figure 5 This is a diagram illustrating the effect of the pressure-sensitive carbon paste layer in a specific embodiment of the present invention.

[0027] Figure 6 This is a diagram illustrating the actual effect of the pressure-sensitive testing unit and the pin connection of the present invention.

[0028] Figure 7 This is a photograph of the actual sensor pinned to fit the device of the present invention. Detailed Implementation

[0029] In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0030] Example 1

[0031] According to the proportion of 50% solid mass fraction, 108 g of polyacrylic acid resin (Mitsubishi BR-85) was dissolved in 108 g of organic solvent component, the organic solvent component was composed of ethylene glycol dimethyl ether: ethylene glycol ethyl ether acetate: DBE = 5:3:2 (volume ratio), heated and stirred at 100°C for 2h to obtain organic resin solution A.

[0032] According to the proportion of 20% solid mass fraction, 14.4 g of ABS powder (Zhenjiang Qimei PA-756) was dissolved in 57.6 g of organic solvent component, the organic solvent component was composed of ethylene glycol dimethyl ether: ethylene glycol ethyl ether acetate: DBE = 5:3:2 (volume ratio), heated and stirred at 80°C for 2h to obtain organic resin solution B.

[0033] At room temperature, 9 g of carbon material powder [7.2 g of Cabot carbon black (XC-72R) and 1.8 g of Adamas multi-walled carbon nanotubes (product number 041122093)], 3 g of Triton x100 (China Pharmaceutical, CAS: 9002-93-1), 3 g of polyamide wax powder (Nanjing Tianshi NEW-0401), organic resin solution A, organic resin solution B, 18 g of dipropylene glycol methyl ether (Adamas, CAS number: 34590-94-8) and 18 g of rosin oil (McLin, CAS number: 8006-64-2) were slowly added to a 500 ml ball mill tank in sequence, and ball milling was carried out at 500 r / min for 8h to obtain pressure-sensitive carbon paste 1.

[0034] Example 2

[0035] According to the proportion of 50% solid mass fraction, 108 g of polyurethane (Shanghai Huntsman 65AB) was dissolved in 108 g of organic solvent component, the organic solvent component was composed of ethylene glycol dimethyl ether: ethylene glycol ethyl ether acetate: DBE = 3:5:2 (volume ratio), heated and stirred at 100°C for 2h to obtain organic resin solution A.

[0036] According to the proportion of 20% solid mass fraction, 14.4 g of ABS powder (Zhenjiang Qimei PA-756) was dissolved in 57.6 g of organic solvent component, the organic solvent component was composed of ethylene glycol dimethyl ether: ethylene glycol ethyl ether acetate: DBE = 3:5:2 (volume ratio), heated and stirred at 80°C for 2h to obtain organic resin solution B.

[0037] At room temperature, 9 g of carbon material powder [7.2 g of Cabot carbon black (XC-72R) and 1.8 g of Adamas multi-walled carbon nanotube (product number 041122093)], 2 g of Triton X100 (Sinopharm, CAS: 9002-93-1), 2 g of polyamide wax powder (Nanjing Tianshi NEW-0401), organic resin solution A, organic resin solution B, 15 g of dipropylene glycol methyl ether (Adamas, CAS number: 34590-94-8), and 15 g of rosin oil (McLin, CAS number: 8006-64-2) were sequentially and slowly added to a 500 ml ball mill tank, and ball milling was performed at 500 r / min for 8 h to prepare pressure-sensitive carbon paste 2.

[0038] Example 3

[0039] According to a proportion of 50% of solid mass fraction, 108 g of polyacrylic acid resin (Mitsubishi BR-85) was dissolved in 108 g of an organic solvent component, the organic solvent component was composed of propylene glycol methyl ether:DBE:dipropylene glycol propyl ether = 3:5:2 (volume ratio), and heating and stirring were performed at 120°C for 2 h to obtain organic resin solution A.

[0040] According to a proportion of 20% of solid mass fraction, 7.2 g of phenolic resin (Henan Pluton New Material BR2123F) and 7.2 g of ABS resin (Zhenjiang Qimei PA-756) powder were dissolved in 57.6 g of an organic solvent component, the organic solvent component was composed of propylene glycol methyl ether:DBE:dipropylene glycol propyl ether = 3:5:2 (volume ratio), and heating and stirring were performed at 100°C for 2 h to obtain organic resin solution B.

[0041] At room temperature, 9 g of carbon material powder [9 g of Cabot carbon black (XC-72R); 1 g of Triton X100 (Sinopharm, CAS: 9002-93-1)], 1 g of polyamide wax powder (Nanjing Tianshi NEW-0401), organic resin solution A, organic resin solution B, 9 g of dipropylene glycol methyl ether (CAS number: 34590-94-8), and 9 g of rosin oil (CAS number: 8006-64-2) were sequentially and slowly added to a 500 ml ball mill tank, and ball milling was performed at 500 r / min for 8 h to prepare pressure-sensitive carbon paste 3.

[0042] Example 4

[0043] According to a proportion of 50% of solid mass fraction, 108 g of polyacrylic acid resin (Mitsubishi BR-85) was dissolved in 108 g of an organic solvent component, the organic solvent component was composed of propylene glycol methyl ether:DBE:dipropylene glycol propyl ether = 2:3:5 (volume ratio), and heating and stirring were performed at 120°C for 2 h to obtain organic resin solution A.

[0044] According to the proportion of solid mass fraction of 20%, 14.4 g ABS (Zhenjiang Qimei PA-756) powder was dissolved in 57.6 g of organic solvent component, the organic solvent component was composed of propylene glycol methyl ether: tributyl citrate: DBE = 2:3:5 (volume ratio), heated and stirred at 80°C for 2h to obtain organic resin solution B.

[0045] At room temperature, 9 g of carbon material powder [of which 3.6 g of Cabot carbon black (XC-72R) and 5.4 g of Adamas multi-walled carbon nanotube (product number 041122093)], 3 g of Triton x100 (China Pharmaceutical, CAS: 9002-93-1), 3 g of polyamide wax powder (Nanjing Tianshi NEW-0401), organic resin solution A, organic resin solution B, 18 g of Solvesso 150 and 18 g of diethylene glycol (CAS number: 111-46-6) were sequentially and slowly added to a 500 ml ball mill tank, and ball milling was carried out at 500 r / min for 8h to prepare pressure-sensitive carbon paste 4.

[0046] Example 5

[0047] According to the proportion of solid mass fraction of 50%, 54 g of polyacrylic resin (Mitsubishi BR-85) and 54 g of thermoplastic elastomer resin (Jiabao TPE K TC2CHT) were dissolved in 108 g of organic solvent component, the organic solvent component was composed of propylene glycol methyl ether: DBE: dipropylene glycol propyl ether = 3:5:2 (volume ratio), heated and stirred at 120°C for 2h to obtain organic resin solution A.

[0048] According to the proportion of solid mass fraction of 20%, 7.2 g of phenolic resin (Henan Pluton New Material BR2123F) and 7.2 g of ABS resin (Zhenjiang Qimei PA-756) were dissolved in 57.6 g of organic solvent component, the organic solvent component was composed of propylene glycol methyl ether: DBE: dipropylene glycol propyl ether = 3:5:2 (volume ratio), heated and stirred at 100°C for 2h to obtain organic resin solution B.

[0049] At room temperature, 9 g of carbon material powder [of which 6 g of Cabot carbon black (XC-72R) and 3 g of Adamas multi-walled carbon nanotube (product number 041122093)], 2 g of Triton x100 (China Pharmaceutical, CAS: 9002-93-1), 2 g of polyamide wax powder (Nanjing Tianshi NEW-0401), organic resin solution A, organic resin solution B, 10 g of Solvesso 150 and 10 g of diethylene glycol (CAS number: 111-46-6) were sequentially and slowly added to a 500 ml ball mill tank, and ball milling was carried out at 500 r / min for 8h to prepare pressure-sensitive carbon paste 5.

[0050] Comparative Example 1

[0051] According to the proportion of solid mass fraction of 42.5%, 122.4g of polyacrylic resin (Mitsubishi BR-85) was dissolved in 165.6g of organic solvent component, the organic solvent component was composed of ethylene glycol dimethyl ether: ethylene glycol ethyl ether acetate: DBE = 5:3:2 (volume ratio), heated and stirred at 100℃ for 2h to obtain organic resin solution A.

[0052] At room temperature, 9g of carbon material powder [7.2g of Cabot carbon black (XC-72R) and 1.8g of Adamas multi-walled carbon nanotube (product number 041122093)], 3g of Triton x100 (Sinopharm, CAS: 9002-93-1), 3g of polyamide wax powder (Nanjing Tianshi NEW-0401), organic resin solution A, 18g of dipropylene glycol methyl ether (Adamas, CAS number: 34590-94-8) and 18g of rosin oil (McLin, CAS number: 8006-64-2) were slowly added into a 500ml ball mill tank in sequence, and ball milling was carried out at 500r / min for 8h to obtain pressure-sensitive carbon slurry 1'.

[0053] Comparative Example 2

[0054] According to the proportion of solid mass fraction of 42.5%, 122.4g of polyacrylic resin (Mitsubishi BR-85) was dissolved in 165.6g of organic solvent component, the organic solvent component was composed of ethylene glycol dimethyl ether: ethylene glycol ethyl ether acetate: DBE = 5:3:2 (volume ratio), heated and stirred at 100℃ for 2h to obtain organic resin solution A.

[0055] At room temperature, 9g of carbon material powder [7.2g of Cabot carbon black (XC-72R) and 1.8g of Adamas multi-walled carbon nanotube (product number 041122093)], 3g of Triton x100 (Sinopharm, CAS: 9002-93-1), 3g of polyamide wax powder (Nanjing Tianshi NEW-0401), organic resin solution A, 18g of dipropylene glycol methyl ether (Adamas, CAS number: 34590-94-8) and 18g of rosin oil (McLin, CAS number: 8006-64-2) were slowly added into a 500ml ball mill tank in sequence, and ball milling was carried out at 500r / min for 8h to obtain pressure-sensitive carbon slurry 1'.

[0056] The pressure-sensitive carbon slurries 1-5 and 1'-2' prepared in the above Examples 1-5 and Comparative Examples 1-2 were applied to the preparation of flexible pressure sensors, and the specific preparation method was as follows:

[0057] (1) using a screen printing process, a commercial conductive silver paste (JY25 printed circuit high conductive silver paste produced by Shanghai Julong Electronics Technology Co., Ltd.) is printed on a PET film, and then placed in a drying oven at 60°C for 2 hours to obtain a PET printed with a silver electrode layer. The mesh used for screen printing has a mesh number of 200 meshes, and the design pattern of the silver electrode layer is as shown in Figure 4 .

[0058] (2) using a screen printing process, the prepared pressure-sensitive carbon paste is printed on the PET printed with the silver electrode layer, and then placed in a drying oven at 60°C for 2 hours to obtain a PET printed with a silver electrode layer and a pressure-sensitive carbon paste layer, as shown in Figure 5 . The mesh used for screen printing has a mesh number of 250 meshes, and the dry film thickness of the formed pressure-sensitive carbon paste layer is 5 μm.

[0059] (3) two PET films each attached with a silver electrode layer and a pressure-sensitive carbon paste layer are attached together with the pressure-sensitive carbon paste layers opposite to each other, and the resistance is led out through the upper and lower silver electrodes, and the packaging is obtained, that is, a PET-based flexible pressure sensor is obtained, which is the pressure sensing test unit used in the present application. The specific attachment and packaging method is as follows: along the edge of the screen-printed pressure-sensitive carbon paste layer dry film pattern, a curing glue (the glue material is determined by the substrate, such as acrylic light-curing glue, etc.) is applied, then the pressure-sensitive areas are aligned, and then a roll press is used to compact, and finally the interface is pinned at the silver electrode layer interface, and the interface is flush, as shown in Figure 6 and Figure 7 .

[0060] Through testing the above-mentioned preparation method to form each flexible pressure sensor, the pressure-sensitive carbon paste formed by the pressure-sensitive film is tested for pressure-resistance response, and after normalizing the test data, the pressure-resistance change rate response curves of the pressure-sensitive carbon paste 1-5 are as shown in Figure 1 , and the pressure-resistance change rate response curves of the pressure-sensitive carbon paste 1'-2' are as shown in Figure 3 . The pressure-resistance response test method is as follows:

[0061] 1) Equipment: digital source table, digital acquisition card, pressure testing machine, wherein the software used is digital acquisition card software and pressure testing machine software.

[0062] 2) First, short Ai sense and AGND on the digital acquisition card, connect Ai 0 to the positive of the digital source table, connect AGND to the negative, and connect the positive and negative ends to the interfaces of the pressure sensing unit, and the pressure sensing area is flush with the pressure testing machine. The digital acquisition card and the pressure testing machine are connected with the working computer, and the corresponding software is opened.

[0063] 3) Digital source meter operation: Constant current setting. Turn on the digital source meter and press F3 to enter the current setting. After entering the value on the keyboard, press Ent to confirm. The voltage value is set according to the resistance value obtained before the test, and the current value is always 0.001A.

[0064] 4) Pressure Testing Machine: Turn on the power to the pressure testing machine, open the pressure testing machine software, and select the serial port connection on the main interface. Then, enter the operation interface.

[0065] 5) Digital acquisition card: Open the digital acquisition card software, connect the device, select YT to enter the settings, select the voltage range, select the minimum scale value for testing, and set it to 1mV (for example, if the range is 0-5V, set 5000 interval points, and the scale value will be 1mV), select to store data, click the .smq file format, and the settings are complete. Enter the test interface.

[0066] 6) Turn on the digital acquisition card test switch to start recording voltage data, and turn on the pressure tester switch to record pressure data.

[0067] The pressure-resistance change rate response curve of the pressure-sensitive carbon paste is obtained, as shown in the figure. Figure 1 and Figure 3 Then to Figure 1 Data processing was performed on the pressure-resistance change rate response curve of medium-pressure sensitive carbon paste 1 to obtain the sensitivity factor of pressure sensitive carbon paste 1 under different pressure ranges. The results are shown in [reference]. Figure 2 As shown in the image.

[0068] from Figure 1 As can be seen, the pressure-sensitive film prepared by the pressure-sensitive carbon paste of the present invention has a response range as high as 0-1200 kPa, which is much higher than that of the pressure-sensitive film prepared by the present invention. Figure 3 The response ranges of Comparative Example 1 (0-500 kPa) and Comparative Example 2 (0-900 kPa) are shown in the figure. A comparison of pressure-sensitive carbon paste 1, pressure-sensitive carbon paste 1', and pressure-sensitive carbon paste 2' shows that when only organic resin with a low elastic modulus (Resin 1) is used, without using organic resin 2 with a high elastic modulus as specified in this invention, the response range of the pressure-sensitive film formed by the carbon paste is significantly smaller than the response range of the pressure-sensitive film formed by using both types of resins with different elastic moduli. Furthermore, a comparison between pressure-sensitive carbon paste 1' and pressure-sensitive carbon paste 2' shows that when only organic resin with a low elastic modulus (Resin 1) is used, although the test ranges differ, they are still significantly smaller than the response range of the pressure-sensitive film formed by pressure-sensitive carbon paste 1.

[0069] from Figure 2 As can be seen from the above, the pressure-sensitive film prepared by the pressure-sensitive carbon paste 1 of the present invention has a sensitivity factor of 1.3 kPa in the range of 0-200 kPa. -1 The sensitivity factor for 200-500 kPa is 0.1 kPa. -10.013 kPa -1 Both have certain sensitivity in the test range, especially in 0-200 kPa with high sensitivity. While the sensitivity test of the pressure-sensitive film formed by pressure-sensitive carbon paste 1' and pressure-sensitive carbon paste 2' in the above pressure range, the pressure-sensitive film formed by pressure-sensitive carbon paste 1' has a sensitivity factor of 0.66 kPa in 0-200 kPa -1 , 200-500 kPa sensitivity factor is 0.042 kPa -1 ; the pressure-sensitive film formed by pressure-sensitive carbon paste 2' has a sensitivity factor of 0.34 kPa in 0-200 kPa -1 , 200-500 kPa sensitivity factor is 0.06 kPa -1 , 500-900 kPa sensitivity factor is 0.017 kPa -1 It can be seen that the pressure-sensitive film formed by pressure-sensitive carbon paste 1' and pressure-sensitive carbon paste 2' has higher sensitivity than the pressure-sensitive film formed by pressure-sensitive carbon paste 1 in the same response range. At the same time, it can be seen from the foregoing description that the response range of the two pressure-sensitive films of the comparative example is smaller, so it will limit its application.

[0070] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. It should be noted that for those skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present application.

Claims

1. A high sensitivity pressure sensitive carbon nanosuspension, characterized by: Prepared from ingredients including carbon nanomaterial, organic resin complex, auxiliary dispersant, anti-settling agent, leveling agent, anti-drying agent and organic solvent; Wherein the total amount of carbon nanomaterial and organic resin complex accounts for 10-40% of the total solid mass fraction of carbon nanoscale paste, and the mass ratio of carbon nanomaterial to organic resin complex is (0.05-0.3):1; the organic resin complex is a complex of organic resin one with an elastic modulus of 0.005-2.0 Gpa and organic resin two with an elastic modulus of 2.5-8.0 Gpa, wherein the mass ratio of organic resin one to organic resin two is (0.05-20):1; The organic resin one is one or more of polyacrylic resin, polyurethane resin, epoxy resin, and thermoplastic elastomer; the organic resin two is one or more of phenolic resin, ABS resin, polyimide resin, and polystyrene resin; Wherein the amount of auxiliary dispersant and anti-settling agent is 0.05-0.4 times the amount of carbon nanomaterial, respectively; wherein the amount of leveling agent and anti-drying agent is 0.1-2.0 times the amount of carbon nanomaterial, respectively; The anti-settling agent is one or more of non-ionic polyoxyethylene fatty amine, non-ionic polyoxyethylene fatty alcohol, polyoxyethylene fatty alcohol sulfate, polyglycol ether, and polyamide wax; The anti-drying agent is one or more of turpentine oil, D-sorbitol, diethylene glycol, and paint solvent oil.

2. The high sensitivity pressure sensing carbon nanocomposite paste of claim 1, wherein: The carbon nanomaterial is one or more of carbon nanotube, graphene, conductive carbon black, and carbon quantum dot.

3. The high sensitivity pressure sensing carbon nanocomposite paste of claim 1, wherein: The auxiliary dispersant is one or more of triethanolamine, hydrogenated castor oil, cyclohexanone, 1,4-butanediol, polyethylene glycol, p-isooctyl phenyl ether, sodium dodecyl benzene sulfonate, and sodium dodecyl sulfate.

4. The high sensitivity pressure sensing carbon nanocomposite paste of claim 1, wherein: The leveling agent is a high-boiling-point solvent with a boiling point not lower than 140℃.

5. The high sensitivity pressure sensing carbon nanocomposite paste of claim 1, wherein: The organic solvent is one or more of ethylene glycol dimethyl ether, propylene glycol methyl ether, tributyl citrate, propylene glycol methyl ether acetate, propylene glycol n-propyl ether, ethylene glycol ethyl ether acetate, dipropylene glycol dimethyl ether, dipropylene glycol methyl ether, dibasic acid ester DBE, dipropylene glycol propyl ether, and diethylene glycol butyl ether.

6. A method for preparing a high-sensitivity pressure-sensitive carbon nanosuspension according to any one of claims 1 to 5, characterized in that Comprising the following steps: S1: dispersing organic resin one into organic solvent at a solid mass fraction of 50%, heating and stirring at 80-120℃ to obtain organic resin solution A; dispersing organic resin two into organic solvent at a solid mass fraction of 20%, heating and stirring at 60-100℃ to obtain organic resin solution B; S2: slowly adding carbon nanomaterial, auxiliary dispersant, anti-settling agent, organic resin solution A, organic resin solution B, leveling agent, and anti-drying agent into a dispersion container in proportion at room temperature, and grinding and reverse dispersing for 8-9h using a grinding device to obtain the high-sensitivity pressure-sensitive carbon nanoscale paste.

7. A high-sensitivity wide-response pressure-sensitive film, characterized by: Prepared from the high-sensitivity pressure-sensitive carbon nanoscale paste of any one of claims 1-5. Prepared from the high-sensitivity pressure-sensitive carbon nanoscale paste of any one of claims 1-5.

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