Aerogel-based long-hang multi-spectrum smoke agent and preparation method thereof

Abstract

The invention discloses an aerogel-based long-hang multi-spectrum smoke agent and a preparation method thereof, and relates to the technical field of electromagnetic interference smoke agents, and the preparation method comprises the following steps: step 1, adding a semiconductor material, conductive aerogel and a proper amount of surface active agent into an airflow and pneumatic mixer, and mixing for more than 2 hours; 2, the obtained solid powder is taken out and graded through a necessary sieve, and then the supported aerogel-based long-hang multi-spectrum smoke agent is obtained; the mass ratio of the conductive aerogel to the rest materials is (50: 1)-(10: 1). The semiconductor material can be replaced by a conductive powder material, and the conductive aerogel can be replaced by non-conductive aerogel. Compared with the prior art, the device has the advantages that the device can suspend in the air for a long time; response, interference and shielding to different wavelengths are realized; the compounding process is simple, and large-scale production can be realized.

Description

Technical Field

[0001] The invention relates to the technical field of electromagnetic shielding materials, and in particular to an aerogel-based long-dwelling multi-spectrum smoke agent and a preparation method thereof. Background Art

[0002] Passive jamming materials are a type of electronic jamming and electromagnetic shielding material with a very high cost-effectiveness ratio. They have been widely used in the field of national defense and are used as various electromagnetic countermeasures and shielding guides to prevent them from hitting strategic targets. Passive jamming materials are divided into two categories: hot smoke and cold smoke. Cold smoke has the advantages of simple application, stable storage, and environmental friendliness.

[0003] However, the existing cold smoke type smoke agent still has the following shortcomings, which limits its widespread use:

[0004] (1) After the smoke agent material is spread, it will stay in the air for too short a time, from more than ten minutes to tens of seconds, and then it will settle or stratify, and the smoke screen concentration will become thinner or the smoke screen will disappear, resulting in a significant reduction in its electromagnetic interference and shielding performance. How to further improve the suspension performance of the smoke agent particles to ensure that the formed smoke can last longer, so as to achieve the function of continuous electromagnetic shielding, is a problem that needs to be further solved in the cold smoke agent and the smoke technology it forms;

[0005] (2) Due to the different wavelengths of ultraviolet, visible, infrared and millimeter waves, different electromagnetic properties and different guidance methods, it is currently difficult to find a single smoke agent that can effectively respond within the entire spectrum and thus effectively perform electromagnetic interference and electromagnetic shielding. Therefore, the development of smoke agents that can effectively respond to multiple spectra is the direction of development of passive jamming technology in various countries, and it is also a difficulty and hot spot. Summary of the invention

[0006] The purpose of the present invention is to provide an aerogel-based long-dwelling multi-spectrum smoke agent and a preparation method thereof, so as to solve the technical problems of short air suspension time, low electromagnetic interference and shielding performance of the existing cold smoke type smoke agents mentioned in the above background technology.

[0007] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: The method for preparing the aerogel-based long-lasting multi-spectrum smoke agent provided by the present invention comprises the following steps:

[0008] Step 1: Add semiconductor materials, conductive aerogel and appropriate amount of surfactant into an air flow pneumatic mixer and mix for more than 2 hours;

[0009] Step 2: taking out the obtained solid powder, and obtaining the supported aerogel-based long-stay multi-spectrum smoke agent after necessary screening and classification;

[0010] The mass ratio of the conductive aerogel to the remaining materials is 50:1-10:1.

[0011] Furthermore, the semiconductor material in step one is copper sulfide nanopowder, copper oxide or zinc oxide.

[0012] Furthermore, the conductive aerogel in step one is carbon aerogel or graphene.

[0013] Furthermore, the semiconductor material in step one is replaced with a conductive powder material.

[0014] Furthermore, the conductive powder material is copper, aluminum, silver nanopowder, graphite powder or carbon black nanopowder.

[0015] Furthermore, the conductive aerogel in step 1 is replaced by non-conductive aerogel.

[0016] Furthermore, the non-conductive aerogel is silica aerogel or cellulose.

[0017] The invention also discloses an aerogel-based long-dwelling multi-spectrum smoke agent, which is specifically prepared by the above-mentioned preparation method.

[0018] Compared with the prior art, one or more of the above technical solutions have the following beneficial effects:

[0019] (1) The density of the prepared smoke agent material is on the same order of magnitude as that in the air, and it can remain suspended in the air for a long time after being released; (2) The relative mass ratio of the materials during the composite process can be adjusted to achieve different purposes and requirements, such as low density or strong extinction coefficient; (3) By composite one or more smoke agent materials on the surface of aerogel, response, interference and shielding of different wavelengths can be achieved; (4) Physical mixing is adopted to capture, load and composite ultrafine powders such as copper sulfide, aluminum powder and graphite powder by utilizing the large comparative surface and super adsorption capacity of aerogel. The composite process is simple and can be mass-produced. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is the smoke agent number and the corresponding material combination and its performance test results. DETAILED DESCRIPTION

[0021] 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 them. 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.

[0022] Copper sulfide nanopowder is a new electronic interference material. The manufacturing method is disclosed in the patent for new electronic interference materials (application number ZL2024102005041) that has been applied for and is to be published.

[0023] Example:

[0024] Solution 1: The present invention adopts the following technical solution to prepare aerogel-based long-lasting multi-spectrum smoke agent, which specifically includes the following steps:

[0025] Step 1: Add the semiconductor material, conductive aerogel and an appropriate amount of surfactant into an air flow pneumatic mixer and mix for more than 2 hours;

[0026] Step 2: taking out the obtained solid powder, and obtaining the supported aerogel-based long-stay multi-spectrum smoke agent after necessary screening and classification;

[0027] The mass ratio of the conductive aerogel to the remaining materials is 50:1-10:1.

[0028] The semiconductor material is copper sulfide nanopowder, copper oxide or zinc oxide.

[0029] The conductive aerogel is carbon aerogel or graphene.

[0030] As shown in Table 1, the combination of semiconductor materials and conductive aerogels can increase the suspension time of smoke agents exponentially, from the common several minutes to tens of minutes or even hours. The aerogel-based long-dwelling multi-spectrum smoke agent manufactured according to this technical solution can significantly increase the hovering time of the smoke agent, can shield and interfere with guided weapons for a long time, and give full play to the performance and function of the smoke agent.

[0031] Solution 2: The present invention adopts the following technical solution to prepare an aerogel-based long-lasting multi-spectrum smoke agent, replacing the semiconductor material in step 1 of embodiment 1 with a conductive powder material, specifically comprising the following steps:

[0032] Step 1: Add the conductive powder material, conductive aerogel and an appropriate amount of surfactant into an air flow pneumatic mixer and mix for more than 2 hours;

[0033] Step 2: taking out the obtained solid powder, and obtaining the supported aerogel-based long-stay multi-spectrum smoke agent after necessary screening and classification;

[0034] The mass ratio of the conductive aerogel to the remaining materials is 50:1-10:1.

[0035] The conductive powder material is copper, aluminum, silver nanopowder, graphite powder or carbon black nanopowder.

[0036] The conductive aerogel is carbon aerogel or graphene.

[0037] As shown in Table 1, the combination of conductive powder material and conductive aerogel produces an aerogel-based long-dwelling multi-spectrum smoke agent, which has significantly improved anti-infrared and anti-millimeter wave capabilities compared to Scheme 1.

[0038] Solution 3: The present invention adopts the following technical solution to prepare an aerogel-based long-lasting multi-spectrum smoke agent, replacing the conductive aerogel in step 1 of embodiment 1 with a non-conductive aerogel, specifically comprising the following steps:

[0039] Step 1: Add the semiconductor material, non-conductive aerogel and an appropriate amount of surfactant into an air flow pneumatic mixer and mix for more than 2 hours;

[0040] Step 2: taking out the obtained solid powder, and obtaining the supported aerogel-based long-stay multi-spectrum smoke agent after necessary sieving and classification;

[0041] The mass ratio of the non-conductive aerogel to the remaining materials is 50:1-10:1.

[0042] The semiconductor material is copper sulfide nanopowder, copper oxide or zinc oxide.

[0043] The non-conductive aerogel is silica aerogel or cellulose.

[0044] As shown in Table 1, the aerogel-based long-dwelling multi-spectrum smoke agent produced by combining semiconductor materials with non-conductive aerogels has no significant improvement in its ability to counter millimeter waves, but its hovering time is extended, thus ensuring that the smoke agent can effectively counter infrared and visible light guided weapons over a longer time and range.

[0045] Scheme 4: The present invention adopts the following technical scheme to prepare aerogel-based long-lasting multi-spectrum smoke agent, replacing the semiconductor material in step 1 of scheme 1 with a conductive powder material, and replacing the conductive aerogel with a non-conductive aerogel, specifically comprising the following steps:

[0046] Step 1: Add the conductive powder material, non-conductive aerogel and an appropriate amount of surfactant into an air flow pneumatic mixer and mix for more than 2 hours;

[0047] Step 2: taking out the obtained solid powder, and obtaining the supported aerogel-based long-stay multi-spectrum smoke agent after necessary screening and classification;

[0048] The mass ratio of the non-conductive aerogel to the remaining materials is 50:1-10:1.

[0049] The conductive powder material is copper, aluminum, silver nanopowder, graphite powder or carbon black nanopowder.

[0050] The non-conductive aerogel is silica aerogel or cellulose.

[0051] As shown in Table 1, the aerogel-based long-dwelling multi-spectrum smoke agent manufactured by combining conductive powder materials with non-conductive aerogels does not have a significant improvement in its ability to counter millimeter waves. Although its hovering time and effectiveness against guided weapons such as infrared and visible light are good, they are inferior to the aerogel-based long-dwelling multi-spectrum smoke agent manufactured by combining semiconductor materials with non-conductive aerogels.

[0052] It can be seen that the smoke agent produced by Plan 4 is most effective in countering guided weapons such as infrared and visible light, and the preparation plan can be selected according to actual needs.

[0053] The present invention is not limited to the above-mentioned specific implementation modes. Various changes made by technicians in the relevant technical field based on the above-mentioned conception without creative work all fall within the protection scope of the present invention.

[0054]

[0055]

[0056]

[0057] Table 1.

Claims

1. A method for preparing an aerogel-based long-dwelling multi-spectrum smoke agent, characterized in that The following steps are involved: Step 1: Add the semiconductor material, conductive aerogel and an appropriate amount of surfactant into an air flow pneumatic mixer and mix for more than 2 hours; Step 2: taking out the obtained solid powder, and obtaining the supported aerogel-based long-stay multi-spectrum smoke agent after necessary screening and classification; The mass ratio of the conductive aerogel to the remaining materials is 50:1-10:

1.

2. The method for preparing the aerogel-based long-dwelling multi-spectrum smoke agent according to claim 1, characterized in that: The semiconductor material in step 1 is copper sulfide nanopowder, copper oxide or zinc oxide.

3. The method for preparing the aerogel-based long-dwelling multi-spectrum smoke agent according to claim 1, characterized in that: The conductive aerogel in step 1 is carbon aerogel or graphene.

4. The method for preparing the aerogel-based long-dwelling multi-spectrum smoke agent according to claim 1, characterized in that: The semiconductor material in step 1 is replaced with a conductive powder material.

5. The method for preparing the aerogel-based long-dwelling multi-spectrum smoke agent according to claim 4, characterized in that: The conductive powder material is copper, aluminum, silver nanopowder, graphite powder or carbon black nanopowder.

6. The method for preparing an aerogel-based long-dwelling multi-spectrum smoke agent according to any one of claims 1 to 5, characterized in that: The conductive aerogel in step 1 was replaced with a non-conductive aerogel.

7. The method for preparing the aerogel-based long-dwelling multi-spectrum smoke agent according to claim 6, characterized in that: The non-conductive aerogel is silica aerogel or cellulose.

8. Aerogel-based long-dwelling multi-spectrum smoke agent, characterized in that: The aerogel-based long-dwelling multi-spectrum smoke agent is prepared by the preparation method according to any one of claims 1 to 7.

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