Preparation method of printable ink with high-sensitivity strain sensing

Abstract

The invention relates to a preparation method of printable ink with high-sensitivity strain sensing. The preparation method comprises the following steps: performing oxygen plasma treatment on a carbon nanotube; carrying out laser ablation treatment on the carbon nano tube subjected to oxygen plasma treatment; pouring the carbon nanotubes subjected to laser ablation treatment and sodium dodecyl benzene sulfonate into water, and stirring by using a homogenizer; performing ultrasonic treatment; adding water-based high-elasticity white adhesive cement, and treating with a homogenizer; and centrifugally defoaming to obtain the printable ink with high strain sensing sensitivity. According to the invention, a metal addition phase in traditional metal particle printable ink is replaced by the carbon nanotubes, so that the strain sensing sensitivity of the printable ink is increased; the method comprises the following steps: treating a carbon nano tube by using oxygen plasma, so that the surface of the carbon nano tube contains a large number of oxygen-containing functional groups; performing laser ablation treatment on the carbon nano tube to generate a microstructure similar to a shrub; a sodium dodecyl benzene sulfonate dispersing agent is introduced, so that the dispersity of the carbon nanotubes in water is improved.

Description

Technical Field

[0001] The invention relates to the technical field of strain sensing, and in particular to a method for preparing printable ink with high-sensitivity strain sensing. Background Art

[0002] A resistive strain gauge is a component used to measure strain. It can convert the strain changes on mechanical components into resistance changes. Strain gauges are widely used in structures such as bridges, mechanical structures, and aircraft wings. By measuring the strain changes of the structure, the magnitude and direction of the force the structure is subjected to can be understood, which is crucial for the design and performance evaluation of the structure.

[0003] Strain sensor sensitivity is an important parameter that describes the performance of strain sensors. It reflects the changing relationship between the output signal and the input strain of the sensor when it is subjected to external force. The higher the strain sensor sensitivity, the more obvious the change in the corresponding strain sensor output signal.

[0004] In the prior art, ink containing metal particles (copper or silver) is printed on a specific substrate material to form a strain sensor with conductive properties. However, due to the high content of metal particles, the strain sensor prepared by the printable ink containing metal particles has a dense conductive path, which causes the change in the resistance value of the strain sensor when it is subjected to external force, thereby affecting the sensitivity of the sensor. Therefore, it is necessary to develop a printable ink with high strain sensing sensitivity to achieve high sensitivity of the strain sensor. Summary of the invention

[0005] The present invention aims to solve the deficiencies of the prior art and provide a method for preparing a printable ink with high-sensitivity strain sensing.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A method for preparing a printable ink with high-sensitivity strain sensing comprises the following steps:

[0008] S1, treating the carbon nanotubes with oxygen plasma for 3 minutes to graft oxygen-containing functional groups onto the carbon nanotubes;

[0009] S2, performing laser ablation treatment on the carbon nanotubes treated with oxygen plasma, the treatment time is 3 minutes, the laser power is 1.5W, so that the carbon nanotubes have a bush-like microstructure;

[0010] S3, mixing the laser ablated carbon nanotubes and sodium dodecylbenzene sulfonate in a mass ratio of 1:1, pouring into water, stirring with a homogenizer, maintaining the temperature at 20°C, the speed of the homogenizer at 8000 rpm, and the total treatment time for 6 hours;

[0011] S4, subjecting the solution obtained in step S3 to ultrasonic treatment, maintaining the temperature at 10°C, the ultrasonic power at 1200W, the ultrasonic on time at 1 second, the ultrasonic off time at 2 seconds, and the total ultrasonic treatment time at 4 hours;

[0012] S5. After the ultrasonic treatment, add water-based high-elastic white glue to the solution, the mass ratio of water-based high-elastic white glue to carbon nanotubes is 100:1, and perform homogenizer treatment. The temperature is maintained at 20° C., the speed of the homogenizer is 16,000 rpm, and the total treatment time is 6 hours.

[0013] S6. Centrifugally degas the solution obtained in step S5 to finally obtain a printable ink with high strain sensing sensitivity.

[0014] In step S1, carbon nanotubes are obtained by mechanical exfoliation.

[0015] In step S5, the added water-based high-elastic white glue paste is a water-based resin.

[0016] In step S6, the centrifugal degassing time is 5 minutes.

[0017] The beneficial effects of the present invention are as follows: the present invention replaces the metal additive in the traditional metal particle printable ink with carbon nanotubes, thereby increasing the strain sensing sensitivity of the printable ink; firstly, the carbon nanotubes obtained by mechanical stripping are treated with oxygen plasma, so that the surface of the carbon nanotubes contains a large number of oxygen-containing functional groups; secondly, the carbon nanotubes are subjected to laser ablation treatment to produce a microstructure similar to bushes; at the same time, sodium dodecylbenzene sulfonate dispersant is introduced to increase the dispersibility of the carbon nanotubes in water; the mixed solution is dispersed using the high shear force of a homogenizer to obtain a printable ink with high strain sensing sensitivity. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention;

[0019] Figure 2 The SEM image of the printable ink obtained in Comparative Example 1;

[0020] Figure 3 The strain sensing sensitivity curve of the printable ink obtained in Comparative Example 1;

[0021] Figure 4 This is a SEM image of the printable ink obtained in Comparative Example 2;

[0022] Figure 5 The strain sensing sensitivity curve of the printable ink obtained in Comparative Example 2;

[0023] Figure 6is a SEM image of the printable ink obtained in specific example 1;

[0024] Figure 7 is a strain sensing sensitivity curve of the printable ink obtained in specific embodiment 1;

[0025] The following is a detailed description of the embodiments of the present invention with reference to the accompanying drawings. DETAILED DESCRIPTION

[0026] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The embodiments are only used to explain the present invention and are not used to limit the scope of the present invention. The present invention is described in more detail by way of example with reference to the accompanying drawings in the following paragraphs. The advantages and features of the present invention will become clearer according to the following description. It should be noted that the accompanying drawings are all in a very simplified form and are not in precise proportions, and are only used to facilitate and clearly assist in explaining the purpose of the embodiments of the present invention.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0028] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Specific embodiment 1:

[0030] A method for preparing a printable ink having high sensitivity strain sensing, such as Figure 1 As shown, the following steps are included:

[0031] S1, treating the carbon nanotubes with oxygen plasma for 3 minutes, so that the carbon nanotubes are grafted with oxygen-containing functional groups; the carbon nanotubes are obtained by mechanical exfoliation;

[0032] S2, performing laser ablation treatment on the carbon nanotubes treated with oxygen plasma, the treatment time is 3 minutes, the laser power is 1.5W, so that the carbon nanotubes have a bush-like microstructure;

[0033] S3, mixing the laser ablated carbon nanotubes and sodium dodecylbenzene sulfonate in a mass ratio of 1:1, pouring into water, stirring with a homogenizer, maintaining the temperature at 20°C, the speed of the homogenizer at 8000 rpm, and the total treatment time for 6 hours;

[0034] S4, subjecting the solution obtained in step S3 to ultrasonic treatment, maintaining the temperature at 10°C, the ultrasonic power at 1200W, the ultrasonic on time at 1 second, the ultrasonic off time at 2 seconds, and the total ultrasonic treatment time at 4 hours;

[0035] S5. After the ultrasonic treatment, add water-based high-elastic white glue to the solution, the mass ratio of water-based high-elastic white glue to carbon nanotubes is 100:1; the added water-based high-elastic white glue is water-based resin; perform homogenizer treatment, maintain the temperature at 20°C, the speed of the homogenizer is 16000 rpm, and the total treatment time is 6 hours;

[0036] S6. The solution obtained in step S5 is subjected to centrifugal degassing for 5 minutes, and finally a printable ink with high strain sensing sensitivity is obtained.

[0037] Comparative Example 1:

[0038] A method for preparing a printable ink, as follows:

[0039] The carbon nanotubes are treated with oxygen plasma for 3 minutes to graft more oxygen-containing functional groups onto the carbon nanotubes;

[0040] The carbon nanotubes treated with oxygen plasma were mixed with sodium dodecylbenzene sulfonate in a mass ratio of 1:1 and poured into water. The mixture was stirred with a homogenizer. The temperature was maintained at 20°C and the speed of the homogenizer was 8000 rpm. The total treatment time was 6 hours.

[0041] The solution obtained in the previous step was subjected to ultrasonic treatment, the temperature was maintained at 10°C, the ultrasonic power was 1200W, the ultrasonic on time was 1 second, the ultrasonic off time was 2 seconds, and the total ultrasonic treatment time was 4 hours;

[0042] After the ultrasonic treatment, water-based high-elastic white glue was added to the solution, and the mass ratio of white glue to carbon nanotubes was 100:1; the solution was treated with a homogenizer, the temperature was maintained at 20°C, the speed of the homogenizer was 16000 rpm, and the total treatment time was 6 hours;

[0043] The obtained solution was subjected to centrifugal degassing for 5 minutes to finally obtain printable ink.

[0044] Comparative Example 2:

[0045] A method for preparing a printable ink, as follows:

[0046] The carbon nanotubes were subjected to laser ablation for 3 minutes at a laser power of 1.5W, so that the carbon nanotubes produced a microscopic structure similar to bushes;

[0047] The laser ablated carbon nanotubes and sodium dodecylbenzene sulfonate were mixed in a mass ratio of 1:1 and poured into water. The mixture was stirred by a homogenizer. The temperature was maintained at 20°C and the speed of the homogenizer was 8000 rpm. The total treatment time was 6 hours.

[0048] The solution obtained in the previous step was subjected to ultrasonic treatment, the temperature was maintained at 10°C, the ultrasonic power was 1200W, the ultrasonic on time was 1 second, the ultrasonic off time was 2 seconds, and the total ultrasonic treatment time was 4 hours;

[0049] After the ultrasonic treatment, water-based high-elastic white glue was added to the solution, and the mass ratio of white glue to carbon nanotubes was 100:1; the solution was treated with a homogenizer, the temperature was maintained at 20°C, the speed of the homogenizer was 16000 rpm, and the total treatment time was 6 hours;

[0050] The obtained solution was centrifuged for degassing for 5 minutes, and finally the ink was printed.

[0051] The SEM image of the printable ink obtained in Comparative Example 1 is as follows: Figure 2 As shown in Figure 2, the strain sensing sensitivity is Figure 3 shown.

[0052] The SEM image of the printable ink obtained in Comparative Example 2 is as follows: Figure 4 As shown in Figure 2, the strain sensing sensitivity is Figure 5 shown.

[0053] The SEM image of the printable ink with high strain sensing sensitivity obtained in Specific Example 1 is as follows: Figure 6 As shown in Figure 2, the strain sensing sensitivity is Figure 7 shown.

[0054] Depend on Figure 2 , Figure 4 , Figure 6 It can be seen that the ink surface obtained by laser ablation will produce a microstructure similar to bushes, which can improve the sensitivity of the ink; Figure 3 , Figure 5 , Figure 7 It can be seen that oxygen plasma treatment of carbon nanotubes can improve the linear sensitivity of the ink.

[0055] The present invention firstly treats the raw material of carbon nanotubes with oxygen plasma for 3 minutes, so that more oxygen-containing functional groups are grafted on the carbon nanotubes. The carbon nanotubes treated with oxygen plasma are subjected to laser ablation treatment for 3 minutes with a laser power of 1.5W, so that the carbon nanotubes produce a microstructure similar to bushes. The carbon nanotubes treated with laser ablation are mixed with sodium dodecylbenzene sulfonate in a mass ratio of 1:1 and poured into water, and a strong shear force is generated by the high speed of a homogenizer, so that the carbon nanotubes are evenly dispersed in water. After the homogenizer treatment is completed, the solution is continuously subjected to ultrasonic treatment, and the role of the ultrasonic treatment is to open some small-scale agglomerated carbon nanotubes and improve the dispersibility of the carbon nanotubes. After the ultrasonic treatment is completed, an aqueous high-elastic white glue is added to the solution, and the solution with the elastic slurry is continuously subjected to homogenizer treatment so that the carbon nanotubes and the white glue are evenly and fully mixed. Finally, the obtained solution is subjected to centrifugal degassing for 5 minutes to obtain a printable ink with high strain sensing sensitivity.

[0056] The present invention replaces the metal additive in the traditional metal particle printable ink with carbon nanotubes, thereby increasing the strain sensing sensitivity of the printable ink. First, the carbon nanotubes obtained by mechanical stripping are treated with oxygen plasma, so that the surface of the carbon nanotubes contains a large number of oxygen-containing functional groups. Secondly, the carbon nanotubes are laser ablated to produce a microstructure similar to bushes. At the same time, sodium dodecylbenzene sulfonate dispersant is introduced to increase the dispersibility of the carbon nanotubes in water. The mixed solution is dispersed using the high shear force of a homogenizer to obtain a printable ink with high strain sensing sensitivity.

[0057] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the present invention, or are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A method for preparing a printable ink with high-sensitivity strain sensing, characterized in that: The following steps are involved: S1, treating the carbon nanotubes with oxygen plasma for 3 minutes to graft oxygen-containing functional groups onto the carbon nanotubes; S2, performing laser ablation treatment on the carbon nanotubes treated with oxygen plasma, the treatment time is 3 minutes, the laser power is 1.5W, so that the carbon nanotubes have a bush-like microstructure; S3, mixing the laser ablated carbon nanotubes and sodium dodecylbenzene sulfonate in a mass ratio of 1:1, pouring into water, stirring with a homogenizer, maintaining the temperature at 20°C, the speed of the homogenizer at 8000 rpm, and the total treatment time for 6 hours; S4, subjecting the solution obtained in step S3 to ultrasonic treatment, maintaining the temperature at 10°C, the ultrasonic power at 1200W, the ultrasonic on time at 1 second, the ultrasonic off time at 2 seconds, and the total ultrasonic treatment time at 4 hours; S5. After the ultrasonic treatment, add water-based high-elastic white glue to the solution, the mass ratio of water-based high-elastic white glue to carbon nanotubes is 100:1, and perform homogenizer treatment. The temperature is maintained at 20° C., the speed of the homogenizer is 16,000 rpm, and the total treatment time is 6 hours. S6. Centrifugally degas the solution obtained in step S5 to finally obtain a printable ink with high strain sensing sensitivity.

2. The method for preparing a printable ink with high-sensitivity strain sensing according to claim 1, characterized in that: In step S1, carbon nanotubes are obtained by mechanical exfoliation.

3. The method for preparing a printable ink with high-sensitivity strain sensing according to claim 2, characterized in that: In step S5, the added water-based high-elastic white glue paste is a water-based resin.

4. The method for preparing a printable ink with high-sensitivity strain sensing according to claim 3, characterized in that: In step S6, the centrifugal degassing time is 5 minutes.

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