One-dimensional Ti4O7 wave-absorbing agent, preparation method and application

Abstract

The application relates to the technical field of wave-absorbing material preparation, in particular to a one-dimensional Ti4O7 wave-absorbing agent, a preparation method and application, which comprises the following steps: preparing one-dimensional TiO2; mixing and dispersing the one-dimensional TiO2 and C in a solvent, drying to obtain a mixture; calcining the mixture to obtain the one-dimensional Ti4O7 wave-absorbing agent. The method is characterized in that the Ti4O7 wave-absorbing agent is prepared by mixing and reacting TiO2 with C in a one-dimensional structure, the Ti4O7 wave-absorbing agent is prepared under the condition of retaining the one-dimensional shape, the one-dimensional Ti4O7 wave-absorbing agent has a high aspect ratio, can construct an effective conductive absorption network, can provide an effective path for the conductive dissipation of electromagnetic waves, can optimize the impedance matching level, can increase the possibility of effective electromagnetic absorption, and due to the special structure, the material has a smaller density, can meet the requirements of thinness, width, lightness and strength of the wave-absorbing material in a true sense. The method solves the problems of large density and poor wave-absorbing performance of the wave-absorbing material in the prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wave-absorbing material preparation, in particular to a one-dimensional Ti4O7 wave-absorbing agent, a preparation method and application thereof. BACKGROUND

[0002] With the progress of modern science and technology and the rapid development of the electronic industry, the application of various digital and high-frequency electronic devices brings convenience to people's work and life, but also brings new environmental pollution-electromagnetic interference. Electromagnetic interference caused by electromagnetic radiation can affect the normal operation of electronic devices, and electromagnetic pollution caused by high-intensity electromagnetic radiation can also cause certain degree of harm to human health.

[0003] Wave-absorbing material is a kind of material that can convert incident electromagnetic energy into heat energy, or make electromagnetic waves interfere and attenuate. On the one hand, wave-absorbing material can absorb emitted probe radar waves, reduce the radar scattering cross section of equipment, thereby playing a radar stealth function; on the other hand, wave-absorbing material can shield electromagnetic radiation in industry and life, and reduce electromagnetic wave hazards.

[0004] The ideal electromagnetic wave absorbing material requires thin thickness, low density, wide absorption bandwidth and strong absorption capacity. The core of the wave-absorbing material is an absorbing agent material with good electromagnetic wave absorption performance, which meets the requirements of "thin, wide, light and strong" performance.

[0005] In order to obtain excellent wave-absorbing performance, electromagnetic impedance matching and electromagnetic loss must be met at the same time. The traditional wave-absorbing material is composed of ceramics, and its electrical conductivity is relatively low, which can only meet the electromagnetic impedance matching, but cannot meet the electromagnetic loss. The traditional wave-absorbing material has the following defects: first, the ceramic wave-absorbing material cannot construct an efficient conductive absorption network, which limits the conductive dissipation path of electromagnetic waves; second, the ceramic wave-absorbing material usually does not have a network structure, which cannot promote the constraint effect of electromagnetic waves in the network structure to enhance absorption through multiple reflection and scattering; third, the low specific surface area and high density of ceramic materials greatly increase the use amount of the material, which leads to the limitation of weight and space of the wave-absorbing material; fourth, the ceramic wave-absorbing material only has a single loss mechanism, which cannot be compared with the composite wave-absorbing agent material with multiple loss mechanisms. Therefore, the traditional wave-absorbing material cannot meet the requirements of "thin, light, wide and strong". SUMMARY

[0006] In view of the problems of large density and poor wave-absorbing performance of the wave-absorbing material in the prior art, the present application provides a one-dimensional Ti4O7 wave-absorbing agent, a preparation method and application thereof.

[0007] To achieve the above purpose, the technical scheme is adopted as follows:

[0008] The application provides a preparation method of one-dimensional Ti4O7 wave-absorbing agent, which comprises the following steps:

[0009] Preparation of one-dimensional TiO2;

[0010] Mixing and dispersing one-dimensional TiO2 and C in a solvent, drying to obtain a mixture;

[0011] Calcining the mixture to obtain one-dimensional Ti4O7 wave-absorbing agent.

[0012] Further, the preparation method of one-dimensional TiO2 is as follows:

[0013] Dispersing TiO2 powder in an alkali solution to form a suspension; the alkali solution is a sodium hydroxide solution or a potassium hydroxide solution with a concentration of 8-12 mol / L;

[0014] Carrying out hydrothermal reaction on the suspension to obtain a hydrothermal reaction product; the temperature of the hydrothermal reaction is 160-185 DEG C, and the reaction time is 18-24 h;

[0015] Carrying out ion exchange on the hydrothermal reaction product to obtain titanic acid;

[0016] Calcining the titanic acid to obtain one-dimensional TiO2.

[0017] Further, the concentration of TiO2 powder in the suspension is 18-22 g / L.

[0018] Further, the ion exchange method of the hydrothermal reaction product to obtain titanic acid is as follows:

[0019] Carrying out ion exchange on the hydrothermal reaction product with a hydrochloric acid solution with a concentration of 0.5-2 mol / L until the solution is neutral, washing with water, drying to obtain titanic acid.

[0020] Further, the calcination temperature of the titanic acid to obtain one-dimensional TiO2 is 400-500 DEG C, and the calcination time is 2-3 h.

[0021] Further, the solvent used for mixing and dispersing one-dimensional TiO2 and C in the mixture is water or anhydrous ethanol.

[0022] Further, in the mixing and dispersing of one-dimensional TiO2 and C in the mixture, the mass ratio of C to one-dimensional TiO2 is (1-1.5):(2-2.5).

[0023] Further, in the calcination of the mixture to obtain one-dimensional Ti4O7 wave-absorbing agent, the calcination temperature is 1050-1200 DEG C, and the calcination time is 3-4 h.

[0024] The application provides a one-dimensional Ti4O7 wave-absorbing agent, and the one-dimensional Ti4O7 wave-absorbing agent is prepared by the method.

[0025] Application of the one-dimensional Ti4O7 wave-absorbing agent in shielding electromagnetic radiation.

[0026] Compared with the prior art, the application has the following beneficial effects:

[0027] The application provides a preparation method of a one-dimensional Ti4O7 wave-absorbing agent, which comprises the following steps: preparing one-dimensional TiO2, mixing and dispersing the one-dimensional TiO2 and C in a solvent, drying and calcining to obtain the one-dimensional Ti4O7 wave-absorbing agent. The one-dimensional Ti4O7 wave-absorbing agent prepared by the method has a high aspect ratio, allows to build an effective conductive absorption network, and provides an effective way for conductive dissipation of electromagnetic waves. Meanwhile, the conductive absorption network can also produce a constraint effect, enhances the absorption of electromagnetic radiation by promoting multiple reflections and scattering in the network structure. In addition, various voids in the conductive network can reduce the effective dielectric constant of the material, make the gap between the magnetic permeability and the dielectric constant smaller, and optimize the impedance matching level. The high aspect ratio of the one-dimensional structure and the reduced amount of material used result in that the absorption material is light in weight and small in size, so that the method is simple and easy to operate, no toxic substances are used in the reaction process, and the waste and pollutants are less.

[0028] The one-dimensional TiO2 is prepared by a simple hydrothermal reaction, and the temperature of the hydrothermal reaction and the concentration of the alkali solution are controlled, so that the method is simple and easy to operate.

[0029] The application further provides a one-dimensional Ti4O7 wave-absorbing agent, which is prepared by the method. Compared with traditional ceramic wave-absorbing materials, the one-dimensional Ti4O7 wave-absorbing agent has a smaller density, and due to the existence of oxygen vacancies in the Ti4O7 wave-absorbing agent, the one-dimensional Ti4O7 wave-absorbing agent can provide an electronic transmission channel and has a higher dielectric constant and electromagnetic radiation absorption performance. The one-dimensional structure of the one-dimensional Ti4O7 wave-absorbing agent can build an effective conductive absorption network to further enhance the absorption of electromagnetic radiation, and the one-dimensional Ti4O7 wave-absorbing agent is an ideal material for shielding electromagnetic radiation.

[0030] The application of the one-dimensional Ti4O7 wave-absorbing agent in shielding electromagnetic radiation, due to the one-dimensional Ti4O7 wave-absorbing agent having a higher dielectric constant, means that the material can store more electric field energy inside, thereby enhancing the absorption capacity of electromagnetic waves, and having a higher electrical conductivity, which is helpful to form a higher energy loss, so that the electromagnetic waves are effectively converted into heat energy and other forms of energy inside the material and dissipated, and the shielding effect is more ideal. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a flowchart for the preparation method of the one-dimensional Ti4O7 wave-absorbing agent.

[0032] Figure 2 The flow chart of the preparation method of the one-dimensional TiO2 of the present application.

[0033] Figure 3 The SEM images of the Ti4O7 wave-absorbing agents prepared under different hydrothermal conditions in the embodiments of the present application, wherein a, b, c and d are the SEM images of the Ti4O7 wave-absorbing agents prepared under the conditions of 160℃ and alkali solution concentrations of 6mol / L, 8mol / L, 10mol / L and 12mol / L respectively, and hydrothermal reaction for 18h; e, f, g and h are the SEM images of the Ti4O7 wave-absorbing agents prepared under the conditions of 180℃ and alkali solution concentrations of 6mol / L, 8mol / L, 10mol / L and 12mol / L respectively, and hydrothermal reaction for 24h.

[0034] Figure 4 The dielectric parameter-frequency variation curve of the Ti4O7 wave-absorbing agents prepared under different concentrations in the embodiments of the present application, wherein a is the real part curve, b is the imaginary part curve, and c is the tangent of loss angle curve, and the hydrothermal temperature is 160℃ and the hydrothermal time is 18h.

[0035] Figure 5 The dielectric parameter-frequency variation curve of the Ti4O7 wave-absorbing agents prepared under different concentrations in the embodiments of the present application, wherein a is the real part curve, b is the imaginary part curve, and c is the tangent of loss angle curve, and the hydrothermal temperature is 180℃ and the hydrothermal time is 24h.

[0036] Figure 6 The reflection loss-frequency relationship curve and the reflection loss (RL) three-dimensional simulation diagram of the Ti4O7 wave-absorbing agents prepared under the conditions of a hydrothermal temperature of 180℃ and a hydrothermal time of 24h in the embodiments of the present application, wherein a is the reflection loss-frequency relationship curve, and b is the reflection loss (RL) three-dimensional simulation diagram. DETAILED DESCRIPTION

[0037] In order for those skilled in the art to understand the features and effects of the present application, the following is a general description and definition of the terms and phrases mentioned in the specification and claims. Unless otherwise specified, all technical and scientific words used in the text are the usual meanings understood by those skilled in the art of the present application, and in case of conflict, the definition in the specification shall prevail.

[0038] Theories or mechanisms described and disclosed herein, whether correct or not, should not be taken as limiting the scope of the present application, i.e., the present application can be practiced without any particular theory or mechanism.

[0039] Herein, all features defined by a numerical range or a percentage range, such as numerical values, amounts, contents and concentrations, are for the sake of brevity and convenience only. Accordingly, the description of a numerical range or a percentage range should be considered to have encompassed and specifically disclosed all possible sub-ranges and individual numerical values within the range (including integers and fractions).

[0040] Herein, unless otherwise specifically noted, "comprise", "comprise", "contain", "have", or similar words are used in the sense of "consist essentially of" and "consist of", for example, "A comprises a" encompasses the meaning of "A comprises a and other" and "A comprises only a".

[0041] Herein, in order to make the description simple, all possible combinations of various technical features in various embodiments or examples are not described. Therefore, as long as the combinations of the technical features do not contradict each other, various technical features in various embodiments or examples can be combined arbitrarily, and all possible combinations should be considered as the scope of the present disclosure.

[0042] The present application will be further described in conjunction with specific examples. It should be understood that these examples are only used to illustrate the present application and not to limit the scope of the present application. Furthermore, it should be understood that those skilled in the art can make various modifications or changes to the present application after reading the content taught by the present application, and these equivalent forms also fall within the scope of the appended claims of the present application.

[0043] In the following examples, conventional apparatuses in the art are used. In the following examples, the experimental methods not specified in the specific conditions are usually carried out according to the conventional conditions, or according to the conditions recommended by the manufacturer. In the following examples, various raw materials are used, unless otherwise specified, conventional commercially available products are used, and the specifications are conventional specifications in the art. In the specification of the present application and the following examples, unless otherwise specified, "%" means weight percent, "parts" means weight parts, and the ratio means weight ratio.

[0044] The present application will be further described in conjunction with specific examples. It should be understood that these examples are only used to illustrate the present application and not to limit the scope of the present application. Furthermore, it should be understood that those skilled in the art can make various modifications or changes to the present application after reading the content taught by the present application, and these equivalent forms also fall within the scope of the appended claims of the present application.

[0045] The present application discloses a preparation method of one-dimensional Ti4O7 wave-absorbing agent, referring to Figure 1 , comprising:

[0046] S1: preparing one-dimensional TiO2, specifically:

[0047] S1.1: dispersing TiO2 powder in an alkali solution to form a suspension: the alkali solution is a sodium hydroxide solution or a potassium hydroxide solution with a concentration of 8-12 mol / L, preferably a sodium hydroxide solution with a concentration of 10-12 mol / L, and further preferably a sodium hydroxide solution with a concentration of 12 mol / L; the concentration of TiO2 powder in the suspension is 18-22 g / L, and preferably 20 g / L;

[0048] S1.2: subjecting the suspension to a hydrothermal reaction to obtain a hydrothermal reaction product: the temperature of the hydrothermal reaction is 160-185℃, and the reaction time is 18-24 h, preferably 170-185℃ and 20-24 h, and further preferably 180-185℃ and 20-24 h;

[0049] S1.3: subjecting the hydrothermal reaction product to ion exchange to obtain a titanate: the hydrothermal reaction product is subjected to ion exchange with a hydrochloric acid solution with a concentration of 0.5-2 mol / L until the solution is neutral, washed with water, and dried to obtain the titanate, and preferably the hydrothermal reaction product is subjected to ion exchange with a hydrochloric acid solution with a concentration of 1 mol / L;

[0050] S1.4: calcining the titanate to obtain one-dimensional TiO2: the calcination temperature is 400-500℃, and the calcination time is 2-3 h, preferably 450℃ and 3 h;

[0051] S2: dispersing the one-dimensional TiO2 and C in a solvent, and drying to obtain a mixture: the solvent used is water or anhydrous ethanol, and preferably anhydrous ethanol; the mass ratio of C to one-dimensional TiO2 is (1-1.5):(2-2.5), and preferably 1:2

[0052] S3: calcining the mixture to obtain one-dimensional Ti4O7 wave-absorbing agent: the calcination temperature is 1050-1200℃, and the calcination time is 3-4 h, preferably 1150-1200℃ and 3 h.

[0053] Example 1

[0054] Sodium hydroxide solutions with concentrations of 6 mol / L, 8 mol / L, 10 mol / L, and 12 mol / L were prepared, respectively;

[0055] In 50 mL of the above sodium hydroxide solution, 1 g of TiO2 powder was dispersed, respectively, and stirred thoroughly for 2 h to obtain a suspension; the suspension was transferred to a hydrothermal reaction kettle, and reacted at 160℃ for 18 h to obtain a hydrothermal reaction product;

[0056] The hydrothermal reaction product obtained is adjusted to pH 7 with a dilute hydrochloric acid solution with a concentration of 1 mol / L, and stirring is continued for 8 h to perform sufficient ion exchange. The excess HCl is washed away by suction filtration with deionized water, and the product obtained is dried at 80°C to obtain titanic acid.

[0057] The titanic acid obtained is calcined in a box furnace at a temperature of 450°C for 2 h to convert it into one-dimensional TiO2.

[0058] One-dimensional TiO2and carbon black are weighed in a mass ratio of C to one-dimensional TiO2of 1:2, anhydrous ethanol is added, and stirring is performed until uniformity is achieved. After ultrasonic treatment for 30 min, centrifugal treatment is performed, and the mixture obtained by centrifugation is then placed in an oven for drying at 60°C for 8 h to obtain a mixture.

[0059] The mixture is placed in a vacuum tube furnace and calcined under a nitrogen atmosphere, with a calcination temperature of 1150°C and a calcination time of 3 h, to obtain a Ti4O7wave-absorbing material.

[0060] Example 2

[0061] Sodium hydroxide solutions with concentrations of 6 mol / L, 8 mol / L, 10 mol / L and 12 mol / L are respectively prepared.

[0062] In 50 mL of the above sodium hydroxide solution, 1 g of TiO2powder is respectively dispersed, and stirring is performed for 2 h to obtain a suspension. The suspension is transferred to a hydrothermal reaction kettle, and reaction is performed at 180°C for 24 h to obtain a hydrothermal reaction product.

[0063] The hydrothermal reaction product obtained is adjusted to pH 7 with a dilute hydrochloric acid solution with a concentration of 1 mol / L, and stirring is continued for 8 h to perform sufficient ion exchange. The excess HCl is washed away by suction filtration with deionized water, and the product obtained is dried at 80°C to obtain titanic acid.

[0064] The titanic acid obtained is calcined in a box furnace at a temperature of 450°C for 2 h to convert it into one-dimensional TiO2.

[0065] One-dimensional TiO2and carbon black are weighed in a mass ratio of C to one-dimensional TiO2of 1:2, anhydrous ethanol is added, and stirring is performed until uniformity is achieved. After ultrasonic treatment for 30 min, centrifugal treatment is performed, and the mixture obtained by centrifugation is then placed in an oven for drying at 60°C for 8 h to obtain a mixture.

[0066] The mixture is placed in a vacuum tube furnace and calcined under a nitrogen atmosphere, with a calcination temperature of 1150°C and a calcination time of 3 h, to obtain a Ti4O7wave-absorbing material.

[0067] The various Ti4O7wave-absorbing agents prepared in Examples 1 and 2 are subjected to SEM testing, and the results are shown in FIGS. 1-4. Figure 3As can be seen from the figures, when the hydrothermal time is 18 h and the hydrothermal temperature is 160℃, with the increase of the concentration of NaOH, the morphology of the Ti4O7 wave-absorbing agent gradually changes from granular to one-dimensional tubular structure. When the hydrothermal time is 24 h, the hydrothermal temperature is 180℃, and the concentration of NaOH is 6 mol / L and 8 mol / L, the SEM images of the Ti4O7 wave-absorbing agent can be observed to have many one-dimensional tubular microcrystalline particles showing stretching, multi-branching and mixed morphology. When the concentration of NaOH is 10 mol / L and 12 mol / L, the tubular microcrystalline particles are bonded to each other to change into bundle-shaped microcrystalline particles. The TiO2 prepared under the hydrothermal condition is subjected to high-temperature oxidation-reduction reaction with carbon black to prepare Ti4O7, and the obtained product retains the original one-dimensional morphology of TiO2, and the one-dimensional structure of the product is more obvious when the hydrothermal time is 24 h and the hydrothermal temperature is 180℃.

[0068] Referring to Figure 4 To measure the influence of the morphology of the Ti4O7 wave-absorbing agent on the electromagnetic radiation absorption performance, the dielectric constant performance test is conducted on the Ti4O7 wave-absorbing agent prepared under different conditions in Example 1, and the results show that the real part of the dielectric constant of the Ti4O7 wave-absorbing agent prepared under the condition of a hydrothermal temperature of 160℃ and a hydrothermal time of 18 h gradually decreases with the increase of the frequency, which is consistent with the relationship between the real part of the dielectric constant of the granular Ti4O7 and the frequency. When the concentration of NaOH is 10 mol / L and 12 mol / L, the real part of the dielectric constant of the obtained Ti4O7 wave-absorbing agent is obviously larger than that of the granular Ti4O7, which is because the one-dimensional Ti4O7 is connected to each other to form a conductive network, so that the conductivity of the material is further improved. When the concentration of NaOH is 6 mol / L and 8 mol / L, the dielectric constant imaginary part value of the Ti4O7 and the relationship between the imaginary part and the frequency are similar to those of the granular Ti4O7, which is because the Ti4O7 prepared under this condition does not have a one-dimensional structure and is still granular. When the concentration of NaOH is 10 mol / L and 12 mol / L, the dielectric constant imaginary part of the Ti4O7 is obviously increased compared with that of the granular Ti4O7, indicating that the one-dimensional structure has stronger electromagnetic wave loss ability. Therefore, when the hydrothermal reaction condition is 160℃, the concentration of the alkali solution in the hydrothermal reaction is preferably 10-12 mol / L, and more preferably 12 mol / L.

[0069] Referring to Figure 5To measure the influence of the morphology of the Ti4O7 wave-absorbing agent on the electromagnetic radiation absorption performance, the dielectric constant performance test was conducted on the Ti4O7 wave-absorbing agent prepared under different conditions in Example 2, and it was found that under the reaction condition of 180℃ for 24h, the real part of the dielectric constant of the prepared Ti4O7 was the same as that of the granular Ti4O7, and tended to decrease with the increase of the frequency. When the concentration of NaOH was 8mol / L, 10mol / L and 12mol / L, the real part of the dielectric constant of the Ti4O7 was obviously increased compared with that of the granular Ti4O7, while the real part of the dielectric constant of the Ti4O7 prepared with the concentration of NaOH of 6mol / L was decreased, which was presumably caused by the poor crystallinity of the one-dimensional Ti4O7 under this condition, leading to the decrease of the dielectric performance. It can be seen that under the condition of 180℃, the concentration of the alkali solution in the hydrothermal reaction is preferably 8-12mol / L, and more preferably 12mol / L.

[0070] Referring to Figure 6 The wave-absorbing performance test was conducted on the Ti4O7 wave-absorbing agent prepared under the hydrothermal reaction condition of 180℃ and the concentration of NaOH of 8mol / L for 24h in Example 2, and it was found that the Ti4O7 wave-absorbing agent in the X wave band (2-18GHz) had an optimal thickness of 3.23mm, and the absorption peak appeared at the frequency of 6.975GHz, and the reflection loss was-68.35dB. It can be seen that the one-dimensional Ti4O7 wave-absorbing agent prepared by the present application has very good electromagnetic radiation absorption function.

[0071] A one-dimensional Ti4O7 wave-absorbing agent is prepared by the above method. Compared with the traditional ceramic wave-absorbing material, the one-dimensional Ti4O7 wave-absorbing agent has smaller density, and due to the existence of oxygen vacancies in the Ti4O7 wave-absorbing agent, it can provide an electronic transmission channel, and has higher dielectric constant and electromagnetic radiation absorption performance, and the one-dimensional structure can construct an effective conductive absorption network to further enhance the absorption of electromagnetic radiation, and is an ideal material for shielding electromagnetic radiation.

[0072] The application of the above one-dimensional Ti4O7 wave-absorbing agent in shielding electromagnetic radiation. Due to the higher dielectric constant of the one-dimensional Ti4O7 wave-absorbing agent, it means that more electric field energy can be stored inside the material, thereby enhancing the absorption capacity of the electromagnetic wave, and having higher conductivity, which is helpful to form higher energy loss, so that the electromagnetic wave is effectively converted into heat energy and other forms of energy inside the material and dissipated, and the shielding effect is more ideal.

[0073] In summary, the application provides a one-dimensional Ti4O7 wave absorber, a preparation method and an application. The Ti4O7 wave absorber is prepared by mixing and reacting TiO2 with C in a one-dimensional structure, so that the one-dimensional Ti4O7 wave absorber has a high aspect ratio, allows to build an effective conductive absorption network, provides an effective way for conductive dissipation of electromagnetic waves, various gaps in the conductive network reduce the effective dielectric constant of the material, the gap between the magnetic permeability and the dielectric constant is small, the impedance matching level is optimized, the possibility of effective electromagnetic absorption is increased, and due to the existence of the special structure, the material has smaller density, and truly meets the requirements of thin, wide, light and strong performance of the wave absorbing material.

[0074] The above merely describes the preferred embodiments of the application and is not intended to limit the technical solutions of the application in any way. Those skilled in the art should understand that the technical solutions can be modified and replaced in several simple ways without departing from the spirit and principles of the application, and these modifications and replacements also fall within the protection scope of the claims.

Claims

1. A method for preparing a one-dimensional Ti4O7 microwave absorber, characterized in that, include: The preparation of one-dimensional TiO2 is as follows: TiO2 powder is dispersed in an alkaline solution to form a suspension; the alkaline solution is a sodium hydroxide solution or a potassium hydroxide solution with a concentration of 8-12 mol / L. The suspension was subjected to a hydrothermal reaction to obtain the hydrothermal reaction product; the temperature of the hydrothermal reaction was 160℃~185℃, and the reaction time was 18~24h. The hydrothermal reaction products were subjected to ion exchange to obtain titanic acid; Titanic acid was calcined to obtain one-dimensional TiO2; One-dimensional TiO2 and C are mixed and dispersed in a solvent, and then dried to obtain a mixture. The mixture was calcined to obtain a one-dimensional Ti4O7 microwave absorber.

2. The method for preparing the one-dimensional Ti4O7 microwave absorbing agent according to claim 1, characterized in that, The concentration of TiO2 powder in the suspension is 18–22 g / L.

3. The method for preparing the one-dimensional Ti4O7 microwave absorbing agent according to claim 1, characterized in that, The method for obtaining titanic acid by ion exchange of the hydrothermal reaction products is as follows: The hydrothermal reaction products were subjected to ion exchange with a hydrochloric acid solution of concentration ranging from 0.5 to 2 mol / L until the solution became neutral. The solution was then washed with water and dried to obtain titanic acid.

4. The method for preparing the one-dimensional Ti4O7 microwave absorbing agent according to claim 1, characterized in that, The titanic acid is calcined to obtain one-dimensional TiO2 at a calcination temperature of 400℃~500℃ and a calcination time of 2~3h.

5. The method for preparing the one-dimensional Ti4O7 microwave absorber according to claim 1, characterized in that, The process involves dispersing one-dimensional TiO2 and C in a solvent, drying the mixture, and obtaining a mixture using water or anhydrous ethanol.

6. The method for preparing the one-dimensional Ti4O7 microwave absorbing agent according to claim 1, characterized in that, The process involves dispersing one-dimensional TiO2 and C in a solvent and drying the mixture to obtain a mixture in which the mass ratio of C to one-dimensional TiO2 is (1-1.5):(2-2.5).

7. The method for preparing the one-dimensional Ti4O7 microwave absorber according to any one of claims 1-6, characterized in that, In the process of calcining the mixture to obtain a one-dimensional Ti4O7 microwave absorber, the calcination temperature is 1050℃~1200℃ and the calcination time is 3~4h.

8. A one-dimensional Ti4O7 microwave absorbing agent, characterized in that, Prepared using the method described in any one of claims 1-7.

9. The application of the one-dimensional Ti4O7 microwave absorbing agent as described in claim 8 in shielding electromagnetic radiation.

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