Optimization method for enhancing performance of carbon nanotube film
Through the process of cutting, rolling and spraying organic solvents on the carbon nanotube film, the problem of recycling of defective products is solved, and the material performance is optimized and the loss is reduced.
Patent Information
- Application Number
- CN202411497992.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-25
- Publication Date
- 2025-01-21
AI Technical Summary
In the prior art, recycling of defective products of carbon nanotube films is difficult to achieve, resulting in increased material loss and cost.
By cutting the carbon nanotube film into a film of consistent size, repeatedly rolling it using a roller press, spraying an organic solvent during the rolling process, and finally drying it in an oven, a carbon nanotube film with optimized properties is prepared.
The repetitive recycling and utilization of bad carbon nanotubes is achieved, reducing material loss, simple process, low cost, short cycle, and increased the film's conductivity and density.
Smart Images
Figure CN119330347A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of nano material preparation, in particular to an optimization method for enhancing the performance of a carbon nano tube film. Background Art
[0002] Carbon nanotubes have been widely used in many research and industrial fields, including flexible displays, sensors, nanofiltration, and supercapacitors, due to their ultra-high tensile strength (100-200GPa), electrical conductivity (106S / cm), flexibility and many other functional properties. Carbon nanotubes are widely used in high-durability energy storage devices, high-performance composite materials, transparent conductive films, portable and wearable devices, and oil-water separators. However, widespread application will also have adverse effects. The performance of carbon nanotube films will not always achieve the expected results. There will always be defective or unqualified products, which greatly increases costs and losses.
[0003] Based on this, a method for enhancing the performance of carbon nanotube films is now provided, which can eliminate the drawbacks of existing devices. Summary of the invention
[0004] The purpose of the present invention is to provide a method for enhancing the performance of a carbon nanotube film, thereby solving the problem of recycling defective carbon nanotube films in the prior art.
[0005] To achieve the above object, the present invention provides the following technical solutions:
[0006] A method for enhancing the performance of a carbon nanotube film comprises the following steps:
[0007] Step 1: Cut the carbon nanotube film into films of uniform size, and use tweezers to neatly stack the films between two pieces of white paper;
[0008] Step 2: repeatedly rolling the sample prepared in step 1 through a roller press, and during the rolling process, continuously spraying the organic solvent to achieve a wetting effect;
[0009] Step 3: Place the sample in step 2 into an oven, and take it out after drying to obtain the finished product.
[0010] On the basis of the above technical solution, the present invention also provides the following optional technical solution:
[0011] In an optional solution: the average thickness of the carbon nanotube film selected is between 12 and 15 um, the electrical conductivity is between 1.4×103S / m and 1.7×103S / m, and the average density is 0.238×103kg / m3.
[0012] In an optional solution: the size of the carbon nanotube film cut from the carbon in step 1 is 7 cm in length and 1.5 cm in width;
[0013] The size of the white paper in step one is about 10cm long and 5.5cm wide.
[0014] In an optional solution: the speed of the roller press selected in step 2 is 10-15 r / min;
[0015] The roller press temperature selected in step 2 is 23° C. to 30° C. (room temperature).
[0016] In an optional solution: the gap of the roller press is reduced from 80um, by 10um each time, and the gap is measured with a caliper. The roller press is performed for 1 to 2 minutes each time until it stops at 20um.
[0017] In an optional solution: the organic solvent selected in step 2 is ethanol or acetone, and acetone has a higher priority.
[0018] In an optional solution: in step 3, the temperature selected for the oven is 80° C. to 100° C., and the drying time is 60 min to 80 min.
[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:
[0020] The beneficial effects of the present invention are that unqualified carbon nanotube films can be repeatedly recycled and overlapped to prepare films with better performance, thereby reducing material loss; the preparation process is simple, the cost is low, and the cycle is short. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 This is the process flow for preparing the finished carbon nanotube film in the embodiment;
[0022] Figure 2 It is the original film of carbon nanotube film;
[0023] Figure 3 This is the cut carbon nanotube film sample;
[0024] Figure 4 This is a low-magnification scanning electron microscope image of a carbon nanotube film sample;
[0025] Figure 5 This is a high-magnification scanning electron microscope image of a carbon nanotube film sample;
[0026] Figure 6 This is a cross-sectional SEM image of a carbon nanotube film sample;
[0027] Figure 7 is a low-magnification scanning electron microscope image of the finished product after rolling in Example 1;
[0028] Figure 8 This is a high-magnification scanning electron microscope image of the finished product after rolling in Example 1;
[0029] Fig. 9 is a cross-sectional SEM image of the finished product after rolling in Example 1;
[0030] Fig.10 is a comparison chart of the conductivity of the carbon nanotube film sample and the finished product after rolling in Example 1;
[0031] Fig.11 It is the comparison of the conductivity of the film before and after rolling. DETAILED DESCRIPTION
[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0033] See also Figure 1-Figure 11 The specific steps of the method for improving the performance of the carbon nanotube film include:
[0034] 1. Cut the carbon nanotube film of Carbon Weng into films of the same size, and use tweezers to neatly stack the films between two pieces of white paper. The size of the white paper should not be too small.
[0035] 2. Repeatedly roll the sample prepared in the previous step through a roller press, control the gap of the roller press, gradually reduce it, control the temperature, and continuously spray organic solvent during the rolling process to achieve a compacting effect and improve performance.
[0036] 3. Put the sample in the previous step into an oven, set the temperature, and then dry it to remove various solutions in the carbon nanotube film, and finally take it out to obtain the finished product.
[0037] The present invention can realize the recycling of carbon nanotube films, reprocess bad films to achieve expected performance, and can be used for the production of other processes to reduce material loss. The present invention has a simple preparation process, low cost and short cycle.
[0038] Embodiment 1:
[0039] First, evenly spread the prepared carbon nanotube film on a piece of A4 white paper, align it with another piece of A4 white paper, then draw a 7cm×1.5cm grid, cut it and place it; select 6 carbon nanotube films, separate them from the surface of the white paper, measure the thickness and conductivity of each carbon nanotube film in turn, then align and stack them, and place them between two white papers (about 10cm×5.5cm) slightly larger than the carbon nanotube film. Put the prepared sample into one side of the roller press, adjust the gap of the roller press to about 80um, the temperature to 23 degrees Celsius, the speed of the roller press to 11r / min, reduce the gap by 10um each time, and roll for 1 to 2min after reducing the gap each time. During this period, spray acetone continuously to make it continuously infiltrate the carbon nanotube film during the rolling process, so that the gap between the films is continuously reduced to achieve density, and finally end the rolling at a gap of about 20um. Take out the carbon nanotube film, put it into the originally set oven, set the temperature to 100 degrees Celsius, dry it for 60 minutes, and finally get the finished product. The thickness of the carbon nanotube film is between 30um and 40um, the density is about 0.364×103kg / m3, and the conductivity is between 2×103S / m and 3×103S / m. The thickness is reduced, and the conductivity is also significantly improved. The performance of the material is improved and can be used for other process manufacturing.
[0040] Embodiment 2:
[0041] First, evenly spread the prepared carbon nanotube film on a piece of A4 white paper, align it with another piece of A4 white paper, then draw a 7cm×1.5cm grid, cut it and place it; select 5 carbon nanotube films, separate them from the surface of the white paper, measure the thickness and conductivity of each carbon nanotube film in turn, then align and stack them, and place them between two white papers (about 10cm×5.5cm) slightly larger than the carbon nanotube film. Put the prepared sample on one side of the roller press, adjust the gap of the roller press to about 80um, the temperature to 23 degrees Celsius, the speed of the roller press to 11r / min, reduce the gap by 10um each time, and roll for 1 to 2min after reducing the gap each time. During this period, spray acetone continuously to make it continuously infiltrate the carbon nanotube film during the rolling process, so that the gap between the films is continuously reduced to achieve density, and finally end the rolling at a gap of about 20um. Take out the carbon nanotube film, put it into the originally set oven, set the temperature to 100 degrees Celsius, dry it for 60 minutes, and finally get the finished product. The thickness of the carbon nanotube film is between 25um and 35um, the density is about 0.345×103kg / m3, and the conductivity is between 2×103S / m and 2.8×103S / m. The thickness is reduced, and the conductivity is also significantly improved. The performance of the material is improved and can be used for other manufacturing processes. Compared with the 6-layer carbon nanotube film rolling, the conductivity of the 5-layer rolling is not stable enough, and the thickness and conductivity of the product obtained by the 6-layer rolling are more stable.
[0042] Embodiment 3:
[0043] First, evenly spread the prepared carbon nanotube film on a piece of A4 white paper, align it with another piece of A4 white paper, then draw a 7cm×1.5cm grid, cut it and place it; select 4 carbon nanotube films, separate them from the surface of the white paper, measure the thickness and conductivity of each carbon nanotube film in turn, then align and stack them, and place them between two white papers (about 10cm×5.5cm) slightly larger than the carbon nanotube film. Put the prepared sample into one side of the roller press, adjust the gap of the roller press to about 80um, the temperature to 23 degrees Celsius, the speed of the roller press to 11r / min, reduce the gap by 10um each time, and roll for 1 to 2min after reducing the gap each time, spray acetone continuously during the rolling process, so that it can continuously infiltrate the carbon nanotube film during the rolling process, so that the gap between the films is continuously reduced to achieve density, and finally end the rolling at a gap of about 20um. Take out the carbon nanotube film, put it into the originally set oven, set the temperature to 100 degrees Celsius, dry it for 60 minutes, and finally get the finished product. The thickness of the carbon nanotube film is between 20um and 30um, the density is about 0.328×103kg / m3, and the conductivity is between 1.9×103S / m and 2.7×103S / m. The thickness has been reduced, and the conductivity has been significantly improved. The performance of the material has been improved and can be used for other manufacturing processes. Compared with the 6-layer carbon nanotube film rolling, the performance of the 4-layer carbon nanotube film product is not stable enough, and the upper and lower deviations of the finished product conductivity are large, which is not suitable for large-scale production, so the 6-layer finished product has the highest priority.
[0044] Embodiment 4:
[0045] First, evenly lay the prepared carbon nanotube film on a piece of A4 white paper, align it with another piece of A4 white paper, then draw a 7cm×1.5cm grid, cut it and place it; select 6 carbon nanotube films, separate them from the surface of the white paper, measure the thickness and conductivity of each carbon nanotube film in turn, then align and stack them, and place them between two white papers (about 10cm×5.5cm) slightly larger than the carbon nanotube film. Put the prepared sample on one side of the roller press, adjust the gap of the roller press to about 80um, the temperature to 23 degrees Celsius, the speed of the roller press to 11r / min, reduce the gap by 10um each time, and roll for 1 to 2min after reducing the gap each time, spray ethanol continuously during the rolling process, so that it can continuously infiltrate the carbon nanotube film during the rolling process, so that the gap between the films is continuously reduced to achieve density, and finally end the rolling at a gap of about 20um. Take out the carbon nanotube film, put it into the originally set oven, the temperature is 100 degrees Celsius, dry it for 60min, and finally get the finished product. The thickness of the carbon nanotube film sprayed with ethanol is uneven, and the improvement of conductivity is not ideal. In comparison, acetone as an organic solvent has better benefits for the carbon nanotube film rolling process, and the performance of the obtained product is better than that prepared with ethanol, so acetone is preferred as the spraying organic solvent.
[0046] The finished products obtained in the above embodiments 1-4 are all Figure 1 The method is through Figure 3 Prepared by cutting carbon nanotube film samples. In Examples 1-3, 6, 5 and 4 carbon nanotube film samples were rolled to prepare finished products, respectively, wherein the thickness of the prepared finished products was reduced and the density hardly changed. In terms of conductivity, the upper and lower deviations of the conductivity of the 4-layer carbon nanotube film finished product are large, the conductivity improvement of the 5-layer is not stable enough, and the conductivity of the 6-layer carbon nanotube film after rolling is between 2×103S / m and 3×103S / m, showing the best conductivity and stable conductivity improvement, so the 6-layer finished product has the highest priority. As for the choice of organic solvent, acetone was used as the organic solvent to prepare the finished products in Examples 1-3. In Example 4, the 6 carbon nanotube films with the highest priority were rolled, and ethanol was used as the organic solvent to prepare the finished product during the rolling process. We can know that the thickness of the finished carbon nanotube film in Example 4 is not uniform, and the improvement of conductivity is not ideal. In comparison, acetone as an organic solvent has better benefits for the carbon nanotube film rolling process, and the product performance is better than that prepared by ethanol, so acetone is preferably selected as the sprayed organic solvent. Therefore, through the above embodiment, 6 layers of carbon nanotube film and acetone are selected as the main material and organic solvent, which can achieve the best material performance.
[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims
1. A method for enhancing the performance of carbon nanotube films, characterized in that: The following steps are involved: Step 1: Cut the carbon nanotube film into films of uniform size, and use tweezers to neatly stack the films between two protective layers; Step 2: repeatedly rolling the sample prepared in step 1 through a roller press, and during the rolling process, continuously spraying the organic solvent to achieve a wetting effect; Step 3: Place the sample in step 2 into an oven, and take it out after drying to obtain the finished product.
2. The method for enhancing the performance of carbon nanotube films according to claim 1, characterized in that: The average thickness of the carbon nanotube film selected by Carbonon is between 12 and 15 um, the conductivity is between 1.4×103S / m and 1.7×103S / m, and the average density is 0.238×103kg / m3.
3. The method for enhancing the performance of carbon nanotube films according to claim 1, characterized in that: The size of the carbon nanotube film cut in step 1 is 7 cm in length and 1.5 cm in width; The size of the protective layer in step one is 10 cm in length and 5.5 cm in width.
4. The method for enhancing the performance of carbon nanotube films according to claim 1, characterized in that: The roller press speed selected in step 2 is 10-15 r / min; The roller press temperature selected in step 2 is 23°C to 30°C.
5. The method for enhancing the performance of carbon nanotube films according to claim 1, characterized in that: The gap of the roller press starts to decrease from 80um, and is reduced by 10um each time. The gap is measured with a caliper. The roller press is performed for 1 to 2 minutes each time until it stops at 20um.
6. The method for enhancing the performance of carbon nanotube films according to claim 1, characterized in that: The organic solvent selected in step 2 is ethanol.
7. The method for enhancing the performance of carbon nanotube films according to claim 1, characterized in that: The organic solvent selected in step 2 is acetone.
8. The method for enhancing the performance of carbon nanotube films according to claim 1, characterized in that: In step 3, the temperature of the oven is 80° C. to 100° C., and the drying time is 60 min to 80 min.
9. The method for optimizing the performance of carbon nanotube films according to claim 1, characterized in that: The protective layer in step one is white paper made of plant fiber material.
10. The method for enhancing the performance of carbon nanotube films according to claim 9, characterized in that: The protective layer in step one is white paper.