Preparation method of composite material for realizing S-band absorption by wrapping biomass carbon with polymer
By preparing a composite material of polymer-wrapped biomass carbon, the problem that existing absorbing materials cannot meet multiple requirements at the same time is solved, and the effect of efficiently absorbing S-band electromagnetic waves is achieved, which is suitable for laboratory and industrial production.
Patent Information
- Application Number
- CN202410426610.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-10
- Publication Date
- 2025-10-17
AI Technical Summary
Existing absorbing materials cannot simultaneously meet the requirements of wide bandwidth, thin thickness, light weight and strong absorption capacity, and there is little research on the composites of conductive polymers and other materials, resulting in a narrow absorption bandwidth.
By mixing biomass carbon and conductive polymer solution under specific conditions and stirring the reaction, a polymer-wrapped biomass carbon composite material is prepared. The reaction temperature, time and stirring method are controlled, the conductive polymer loading rate and the degree of biomass carbonization are adjusted, and an S-band absorption composite material is prepared.
It achieves efficient absorption of S-band electromagnetic waves, has simple production equipment, short response time, is suitable for laboratory and industrial production, and has excellent wave absorbing performance.
Smart Images
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Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of chemical preparation, in particular to a preparation method of a composite material of polymer-coated biomass carbon for realizing S-band absorption. BACKGROUND
[0002] With the rapid development and wide use of electronic equipment and communication technology, electromagnetic radiation has become a new source of pollution, and the harm to electronic equipment and human body is also becoming more and more serious, for example, the airport and the flight cannot take off due to electromagnetic wave interference and miss the point; electromagnetic radiation causes direct and indirect harm to human body through thermal effect, non-thermal effect and cumulative effect. Therefore, developing wave-absorbing materials with high electromagnetic energy loss performance is an important way to solve the problem of electromagnetic pollution. An ideal wave-absorbing material should meet four basic requirements: wide frequency band, thin thickness, light weight and strong absorption capacity, and can fully utilize three loss mechanisms: dielectric loss, magnetic loss and resistance loss.
[0003] However, traditional wave-absorbing materials such as metal oxides are limited by the high density of the material itself, and cannot meet all four basic requirements, and the loss mechanism is also relatively single. In addition, carbon materials with nanostructure as typical electromagnetic wave absorbing materials have the advantages of low density, wide source, adjustable chemical properties, good electrical conductivity, etc., such as graphene, graphite, carbon fiber, carbon nanotube, carbon black, etc. However, the production efficiency of carbon materials such as graphene and carbon nanotube is low, the production scale is small, and the cost is very high, which is currently only suitable for laboratory research and not suitable for wide range of applications.
[0004] Conductive polymers are a class of polymers with resistivity between conductor and semiconductor, which contain single-double bond repeating structural units in the structure, which are conducive to the formation of conjugated bonds and have conductivity. As electromagnetic shielding materials, conductive polymers have been widely studied due to their low density, low cost, corrosion resistance and easy preparation. However, single polymer wave-absorbing materials have a relatively narrow wave-absorbing band, so the combination of conductive polymers with other materials to broaden the effective wave-absorbing width and improve the wave-absorbing efficiency has become a focus of research and development of such materials.
[0005] In recent years, new wave-absorbing materials designed by composite of conductive polymers have made remarkable achievements in the field of electromagnetic wave absorption, but research on conductive polymer-coated biomass carbon materials is still rare, and there are few related theoretical research documents. SUMMARY
[0006] In view of the above technical problems, the present application provides a method for preparing S-band electromagnetic wave absorbing composite material under simple conditions, and the production of the composite material can be realized. The present application simply and controllably synthesizes a composite material of polymer-coated biomass carbon. The preparation method can be simultaneously applied to laboratory research and large-scale production in factories.
[0007] The technical scheme of the present application is as follows:
[0008] A preparation method of a composite material of polymer-coated biomass carbon for realizing S-band absorption, comprising the following steps:
[0009] Placing the biomass carbon and the polymer solution in a specific environment;
[0010] Processing to make the biomass carbon material dispersed in the polymer solution;
[0011] Stirring the solution environment at a certain temperature to promote the reaction;
[0012] Stopping stirring after a period of time;
[0013] Washing, centrifuging, and drying to obtain the composite material of polymer-coated biomass carbon.
[0014] The present application uses biomass carbon and conductive polymer as raw materials, and utilizes the fact that the conductive polymer can convert electromagnetic wave energy into heat consumption points to realize effective absorption of electromagnetic waves; at the same time, the special porous morphology of the biomass carbon after carbonization is further used to strengthen the incidence and absorption of electromagnetic waves and improve the overall wave absorption performance; in a solution system at a specific temperature, the polymer is loaded onto the surface of the biomass carbon by continuous stirring, thereby obtaining a composite material with excellent S-band absorption; and further by adjusting the loading rate of the conductive polymer and the degree of carbonization of the biomass carbon, the most excellent wave absorption material with comprehensive performance is obtained.
[0015] It should be noted that the reaction of the polymer and the biomass carbon in the present application is carried out under certain conditions.
[0016] The temperature is 10-80℃.
[0017] The reaction time is 5-48h. By controlling the reaction time, the loading rate of the polymer can be adjusted.
[0018] The stirring mode includes ultrasonic stirring, mechanical stirring, and magnetic stirring.
[0019] The solution in the polymer solution is a suitable organic solution or a buffer solution with a certain pH.
[0020] The polymer covers the surface of the biomass carbon.
[0021] In the technical scheme of the present application, the amount of the polymer used needs to be controlled to control the loading amount and thus the wave absorption performance of the polymer; at the same time, the reaction rate is controlled by controlling the reaction temperature.
[0022] Further, the reaction time can be controlled to control the reaction degree.
[0023] The present application has the following advantages:
[0024] (1) Compared with the existing preparation method, the preparation method of the present application has simpler production equipment, shorter reaction time and faster production speed.
[0025] (2) The product has good S-band wave absorption performance, and the comprehensive performance of the wave absorption material can be optimized by adjusting the loading rate of the conductive polymer and the carbonization degree of the biomass.
[0026] (3) The preparation method of the present application can realize the production of the composite material, which is more conducive to scientific research promotion and industrialization compared with other methods. BRIEF DESCRIPTION OF DRAWINGS
[0027] Figure 1 Reflection loss diagram of the composite material obtained in Example One.
[0028] Figure 2 Impedance matching diagram of the composite material obtained in Example One.
[0029] Figure 3 Reflection loss diagram of the composite material obtained in Example Two.
[0030] Figure 4 Impedance matching diagram of the composite material obtained in Example Two.
[0031] Figure 5 Reflection loss diagram of the composite material obtained in Example Three.
[0032] Figure 6 Impedance matching diagram of the composite material obtained in Example Three. DETAILED DESCRIPTION
[0033] Example One
[0034] This embodiment is carried out in a round-bottom flask with a stopper, and the whole reaction is carried out in a thermostat pot with a magnetic stirrer.
[0035] A preparation method of a composite material of polymer-coated biomass carbon for S-band absorption, comprising the following steps:
[0036] (1) 0.10 g of peach pit carbon and 0.10 g of dopamine hydrochloride are weighed separately.
[0037] (2) 40 ml of buffer solution (pH = 8) is prepared and placed in a round-bottom flask prepared in advance.
[0038] (3) The peach pit carbon is added to the round-bottom flask and ultrasonicated for 10 min.
[0039] (4) Add dopamine hydrochloride, place the round-bottom flask in a thermostatic pot, add a stirrer, set the reaction temperature to 30°C, start the reaction, and stir for 24 hours.
[0040] (5) After the reaction is completed, centrifugation, washing, and drying are performed to obtain a polymer-coated biomass carbon composite material.
[0041] Figure 1 This is the reflection loss diagram of the composite material obtained in Example 1. Figure 1 It can be seen that the composite material has a certain absorption capacity in the S band; Figure 2 This is the impedance matching diagram of the composite material obtained in Example 1. Figure Two It can be seen that the impedance matching of the composite material is better in the S band.
[0042] Example 2
[0043] This example was carried out in a stoppered round-bottom flask, and the entire reaction was carried out in a thermostatic pot equipped with a magnetic stirrer.
[0044] A method for preparing a composite material of polymer-coated biomass carbon to achieve S-band absorption comprises the following steps:
[0045] (1) Weigh 0.10 g of peach pit carbon and 0.20 g of dopamine hydrochloride respectively.
[0046] (2) Prepare 40 ml of buffer solution (pH = 8) and place it in a round-bottom flask prepared in advance.
[0047] (3) Add peach pit carbon into a round-bottom flask and sonicate for 10 minutes.
[0048] (4) Add dopamine hydrochloride, place the round-bottom flask in a thermostatic pot, add a stirrer, set the reaction temperature to 30°C, start the reaction, and stir for 24 hours.
[0049] (5) After the reaction is completed, centrifugation, washing, and drying are performed to obtain a polymer-coated biomass carbon composite material.
[0050] Figure 3 This is the reflection loss diagram of the composite material obtained in Example 2. Figure 2 It can be seen that with the increase in the amount of polymer used, the absorption performance of the composite material is significantly improved in the S band and migrates to the S band. Figure 4 This is the impedance matching diagram of the composite material obtained in Example 2. Figure 4 It can be seen that with the increase in the amount of polymer used, the impedance matching of the composite material is significantly improved in the S band.
[0051] Example 3
[0052] This example was carried out in a stoppered round-bottom flask, and the entire reaction was carried out in a thermostatic pot equipped with a magnetic stirrer.
[0053] A method for preparing a composite material of polymer-coated biomass carbon to achieve S-band absorption comprises the following steps:
[0054] (1) Weigh 0.10 g of peach pit carbon and 0.05 g of dopamine hydrochloride respectively.
[0055] (2) Prepare 40 ml of buffer solution (pH = 8) and place it in a round-bottom flask prepared in advance.
[0056] (3) Add peach pit carbon into a round-bottom flask and sonicate for 10 minutes.
[0057] (4) Add dopamine hydrochloride, place the round-bottom flask in a thermostatic pot, add a stirrer, set the reaction temperature to 30°C, start the reaction, and stir for 24 hours.
[0058] (5) After the reaction is completed, centrifugation, washing, and drying are performed to obtain a polymer-coated biomass carbon composite material.
[0059] Example 4
[0060] This example was carried out in a stoppered round-bottom flask, and the entire reaction was carried out in a thermostatic pot equipped with a magnetic stirrer.
[0061] A method for preparing a composite material of polymer-coated biomass carbon to achieve S-band absorption comprises the following steps:
[0062] (1) Weigh 0.75 g of peach pit carbon.
[0063] (2) Prepare 50 ml of 0.45 g / l polyaniline solution (solvent: tetrahydrofuran) and place it in a round-bottom flask prepared in advance.
[0064] (3) Add peach pit carbon into a round-bottom flask and sonicate for 30 minutes.
[0065] (4) Place the round-bottom flask in a thermostatic pot, add a stirrer, set the reaction temperature to 30°C, start the reaction continuously, and stir for 24 hours.
[0066] (5) After the reaction is completed, centrifugation, washing, and drying are performed to obtain a polymer-coated biomass carbon composite material.
[0067] Figure 5 This is the reflection loss diagram of the composite material obtained in Example 3. Figure 5 It can be seen from the figure that after changing the type of polymer, the absorption performance of the composite material is better in the S band.Figure 6 Impedance matching graph of the composite material obtained in Example Three. From Figure 6 It can be seen from
[0068] Example Five
[0069] This example was carried out in a round-bottom flask with a stopper, and the whole reaction was carried out in a thermostat pot with a magnetic stirrer.
[0070] A method for preparing a composite material of biomass carbon wrapped by a polymer to achieve S-band absorption, comprising the following steps:
[0071] (1) Take 0.5 g of peach pit carbon.
[0072] (2) Prepare 50 ml of 0.45 g / l polyaniline solution (solvent: tetrahydrofuran) and place it in a round-bottom flask prepared in advance.
[0073] (3) Add peach pit carbon to the round-bottom flask and ultrasonic for 30 min.
[0074] (4) Place the round-bottom flask in a thermostat pot, add a stirrer, set the reaction temperature to 30°C, and start the reaction continuously, and stir for 24 h.
[0075] (5) After the reaction is completed, centrifugation, washing, and drying can obtain a composite material of biomass carbon wrapped by a polymer.
[0076] Example Six
[0077] This example was carried out in a round-bottom flask with a stopper, and the whole reaction was carried out in a thermostat pot with a magnetic stirrer.
[0078] A method for preparing a composite material of biomass carbon wrapped by a polymer to achieve S-band absorption, comprising the following steps:
[0079] (1) Take 0.75 g of oak carbon.
[0080] (2) Prepare 50 ml of 0.45 g / l polyaniline solution (solvent: tetrahydrofuran) and place it in a round-bottom flask prepared in advance.
[0081] (3) Add oak carbon to the round-bottom flask and ultrasonic for 30 min.
[0082] (4) Place the round-bottom flask in a thermostat pot, add a stirrer, set the reaction temperature to 30°C, and start the reaction continuously, and stir for 24 h.
[0083] (5) After the reaction is completed, centrifugation, washing, and drying can obtain a composite material of biomass carbon wrapped by a polymer.
[0084] The above embodiments only express several implementation manners of the present application, which are described in a more specific and detailed manner, but cannot be understood as a limitation on the patent scope of the present application. It should be noted that, for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, which all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the claims.
Claims
1. A method for preparing a composite material of polymer-wrapped biomass carbon to achieve S-band absorption, characterized in that: The steps include: The biomass carbon and polymer solution are placed in a specific environment; Processing is performed so that the biomass carbon materials are dispersed in the polymer solution; At a certain temperature, the environment in which the solution is located is continuously stirred to promote the reaction; After reacting for a period of time, stop stirring; After washing, centrifugation and drying, a composite material of polymer-wrapped biomass carbon can be obtained.
2. The method according to claim 1, characterized in that wherein the temperature is from 10°C to 80°C.
3. The method according to claim 1, characterized in that The reaction time is 5 hours to 48 hours.
4. The method according to claim 1, wherein The solution in the polymer solution is a suitable organic solution or a buffer solution with a certain pH.
5. The method according to claim 1, wherein The biomass carbon is one of peach pit carbon, oak carbon and bamboo chip carbon.
6. The method according to claim 1, characterized in that The stirring methods include ultrasonic stirring, mechanical stirring and magnetic stirring.
7. The method according to claim 1, characterized in that The polymer is one of polydopamine, polyaniline and polypyrrole.
8. The method according to claim 1, characterized in that The mass ratio of the biomass carbon to the polymer is 1:(0.01-2.7).
9. The method according to claim 1, characterized in that The polymer covers the surface of the biomass carbon.