A method of making a single dose multi-spectrum cold smoke screen countermeasure material

Abstract

The application discloses a method for preparing single-dose multi-frequency spectrum cold smoke screen interference material, and comprises the following steps: modifying B-based powder once to obtain hydroxyl-modified B-based powder; mixing the hydroxyl-modified B-based powder with spherical material and modifying the hydroxyl-modified B-based powder again to obtain modified B-based powder containing amino groups; the modified B-based powder containing amino groups is attached to the surface of the spherical material; the spherical material with the modified B-based powder containing amino groups attached thereto is dried once; modifying silicon-based powder three times to obtain hydroxyl-modified silicon-based powder; mixing the dried spherical material with the modified B-based powder containing amino groups attached thereto and the hydroxyl-modified silicon-based powder, and then performing liquid-free grinding to obtain mixed powder; and drying the mixed powder twice to obtain the single-dose multi-frequency spectrum cold smoke screen interference material, so that the single-dose multi-frequency spectrum smoke screen interference material has good dispersion effect in the air, long duration, wide interference wave band, and will not decompose in the air.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of smoke screen interference materials, and particularly relates to a method for preparing single-dose multi-spectrum cold smoke screen interference materials. BACKGROUND

[0002] In an information-based battlefield, smoke screen is a photoelectric countermeasure with high cost-effectiveness, convenient use and simple preparation, and can achieve the effects of confusing the enemy and hiding oneself.

[0003] Traditional smoke screen interference materials have problems of poor shielding effect, short duration and narrow interference waveband; in order to improve the interference waveband of the smoke screen interference materials, a plurality of materials are generally mixed by hot reaction or mixed by cold dry ball milling to prepare multi-spectrum smoke screen interference materials; the hot reaction mixing method for preparing multi-spectrum smoke screen interference materials has the problems of particle agglomeration caused by moisture in the mixing process and crystallization possibly occurring in the drying process, which leads to poor dispersion effect in the air and short duration in the air of the multi-spectrum smoke screen interference materials; however, the cold dry ball milling mixing method leads to difficulties in the structural integrity of the materials and the combination stability of the plurality of materials, thereby leading to separation of the multi-spectrum smoke screen interference materials into a plurality of materials in the air or leading to poor dispersibility and poor flowability in the air of the multi-spectrum smoke screen interference materials.

[0004] Therefore, how to prepare a multi-spectrum smoke screen interference material with good dispersion effect in the air, long duration and wide interference waveband, and without decomposition in the air has become a difficult problem to be solved in the field. SUMMARY

[0005] In order to solve the above technical problems, a method for preparing single-dose multi-spectrum cold smoke screen interference materials is provided, which realizes preparation of a multi-spectrum smoke screen interference material with good dispersion effect in the air, long duration and wide interference waveband, and without decomposition in the air; the multi-spectrum smoke screen interference material has multi-spectrum interference performance in visible, infrared and laser wavebands.

[0006] According to the present application, a method for preparing single-dose multi-spectrum cold smoke screen interference materials is provided, which comprises the following steps:

[0007] The B-based powder is modified once to obtain a hydroxyl-modified B-based powder;

[0008] The hydroxyl-modified B-based powder is mixed with the balls and the hydroxyl-modified B-based powder is modified again to obtain an amino-containing modified B-based powder; the amino-containing modified B-based powder is attached to the surface of the balls;

[0009] The balls with the amino-containing modified B-based powder attached thereto are dried once;

[0010] The silicon-based powder is modified three times to obtain a hydroxyl-modified silicon-based powder;

[0011] The ball material with the modified B-based powder containing amino groups attached after drying and the hydroxyl-modified silicon-based powder are mixed and then liquid-free grinding is performed to obtain a mixed powder;

[0012] The mixed powder is dried twice to obtain a single-agent multi-spectrum cold smoke jamming material;

[0013] The single-agent multi-spectrum cold smoke jamming material has a single particle characteristic, and the single-agent multi-spectrum cold smoke jamming material has a core-shell structure, the core is a hydroxyl-modified silicon-based powder, and the core-shell coated outside the core is a modified B-based powder containing amino groups; preferably, the B-based powder includes B powder or a B-containing compound; and preferably, the silicon-based powder includes silicon powder or a silicon-containing compound;

[0014] Preferably, the single-agent multi-spectrum cold smoke jamming material has a visible light attenuation rate of >98.49%, an infrared light attenuation rate of >98.32%, a medium infrared light attenuation rate of >95.24%, a far infrared light attenuation rate of >97.65%, a laser attenuation rate of >94.49% at a wavelength of 1.06 μm, a laser attenuation rate of >96.4% at a wavelength of 10.6 μm, and an effective shielding of >120 s; the bulk density is 0.5-0.6 g / cm 3 ; the resistivity is ≥10 5 Ω.m.

[0015] Compared with the prior art, the present application has the beneficial effects that by modifying the B-based powder once, the B-based powder surface is connected with hydroxyl groups to obtain a hydroxyl-modified B-based powder;

[0016] By mixing the hydroxyl-modified B-based powder with the ball material and modifying the hydroxyl-modified B-based powder twice, the hydroxyl groups of the prepared hydroxyl-modified B-based powder are combined with amino groups; and the modified B-based powder containing amino groups is attached to the grinding ball material;

[0017] By drying the ball material with the modified B-based powder containing amino groups attached once, the strength of the modified B-based powder containing amino groups attached to the grinding ball material is improved, and excess water is removed, thereby facilitating the subsequent liquid-free grinding of the ball material with the modified B-based powder containing amino groups attached after drying and the hydroxyl-modified silicon-based powder mixed, so that the modified B-based powder containing amino groups does not directly fall off, but is coated on the outer surface of the hydroxyl-modified silicon-based powder when the hydroxyl-modified silicon-based powder contacts the ball material with the modified B-based powder containing amino groups attached after drying, and at the same time, plays a lubricating effect, avoiding the phenomenon of structure damage of the hydroxyl-modified silicon-based powder in the ball milling process;

[0018] By modifying the silicon-based powder three times, the hydroxyl-modified silicon-based powder is obtained, and the hydroxyl-modified silicon-based powder and the modified B-based powder containing amino coated outside form a -N-H-O-H structure, and the binding strength is high; thereby obtaining a single-agent multi-spectrum cold smoke screen interference material in a core-shell structure, the core is the hydroxyl-modified silicon-based powder, the shell coated outside the core is the modified B-based powder containing amino, and the binding strength of the core and the shell is high; the single-agent multi-spectrum cold smoke screen interference material has good dispersion effect in the air, long duration, wide interference band, and the multi-spectrum smoke screen interference material will not decompose in the air; the multi-spectrum smoke screen interference material has multi-spectrum interference performance in visible, infrared, and laser bands.

[0019] Further, the specific process for preparing the hydroxyl-modified B-based powder includes:

[0020] The first solution and the B-based powder are mixed in a ball milling device at a mass ratio of (5-10):(90-95), and heating is performed during the mixing process, the heating temperature is 125-145℃, and the mixing time is 2-3h; then the obtained mixture is dried to obtain the hydroxyl-modified B-based powder.

[0021] Further, the particle size D50 of the B-based powder is 50-100nm;

[0022] The first solution includes water and / or ethanol;

[0023] The volume ratio of the first solution to the ball material in the ball milling device is (45-55):(45-55).

[0024] The beneficial effects of the above step are that by including water and / or ethanol in the first solution, the B-based powder is combined with the hydroxyl in water or ethanol at 125-145℃, and no excess impurities are introduced, and the problem of crystallization and grain growth of the B-based powder caused by excessively high temperature is avoided;

[0025] By setting the particle size D50 of the B-based powder to 50-100nm, it is beneficial to obtain a smaller hydroxyl-modified B-based powder, avoid the reduction of the subsequent coating rate of the hydroxyl-modified silicon-based powder caused by large particles, and avoid the problem that the subsequent modified B-based powder containing amino is too firmly combined with the ball material and is not easy to separate from the ball material.

[0026] Further, the specific process for preparing the modified B-based powder containing amino and attaching it to the surface of the ball material includes the following steps:

[0027] The hydroxyl-modified B-based powder and cetyltrimethylammonium bromide are added to the ball milling device and mixed with polyvinyl alcohol;

[0028] Secondary modification heating is performed during the mixing process, and the mixing and heating time is 2-4h.

[0029] The modified B-based powder containing amino is obtained, and the modified B-based powder containing amino is attached to the surface of the ball material.

[0030] Further, the mass ratio of the hydroxyl modified B-based powder, the cetyltrimethylammonium bromide and the polyvinyl alcohol is (88-92):(0.3-5):(8-12).

[0031] The heating temperature in the secondary modification process is 110-120℃.

[0032] The beneficial effect of the above step is that the hydroxyl of the hydroxyl modified B-based powder is combined with the amino provided by the cetyltrimethylammonium bromide, so as to obtain the modified B-based powder containing amino.

[0033] The polyvinyl alcohol is beneficial to realize the attachment of the modified B-based powder containing amino to the surface of the ball material.

[0034] The secondary modification heating temperature is 110-120℃, which is beneficial to avoid the problems of crystallization and grain growth of the B-based powder caused by too high temperature.

[0035] Further, the mass ratio of the hydroxyl modified B-based powder and the ball material in the ball milling equipment is (88-92):(100-150).

[0036] The beneficial effect of the above step is that it is beneficial to realize the attachment of the hydroxyl modified B-based powder to the surface of the ball material, and the attachment thickness is relatively uniform.

[0037] Further, the temperature for drying the ball material with the modified B-based powder containing amino is 100-120℃, and the drying time is 6-8h.

[0038] The beneficial effect of the above step is that the water is volatilized, and the problems of crystallization and grain growth of the B-based powder are avoided.

[0039] Further, the process for preparing the hydroxyl modified silicon-based powder specifically includes the following steps:

[0040] The silane coupling agent and the silicon-based powder are mixed in the grinding equipment according to the mass ratio (4-8):(92-96), and heating is performed during the mixing process, the heating temperature is 165-185℃, and the mixing time is 2-3h; then the obtained mixture is dried to obtain the hydroxyl modified silicon-based powder.

[0041] The silane coupling agent comprises one of aminopropyl triethoxysilane, aminopropyl trimethoxysilane, and urea propyl triethoxysilane; preferably, the silane coupling agent and the silicon-based powder are mixed in the grinding device at a mass ratio of (4-8):(92-96), then 95% ethanol is added, and the mass ratio of 95% ethanol to the silane coupling agent is (4-8):(5-10).

[0042] The beneficial effect of the above step is that the amino group in the silane coupling agent is combined with the silicon-based powder to obtain a hydroxyl-modified silicon-based powder, and the third modification process does not include water or includes a small amount of water, which is beneficial to avoid the problems of crystallization and crystal growth of the silicon-based powder.

[0043] Further, the dried ball material with the amino-containing modified B-based powder and the hydroxyl-modified silicon-based powder are mixed and then added to a ball milling device for liquid-free grinding, and then magnesium carbonate is added for ball milling and mixing, and the mixing time is 40-50 h, and then the powder material in the ball milling device is taken out to obtain a mixed powder;

[0044] The particle size D50 of the hydroxyl-modified silicon-based powder is 100-200 nm.

[0045] The mass ratio of the amino-containing modified B-based powder on the surface of the ball material, the hydroxyl-modified silicon-based powder, and the magnesium carbonate is (5-20):(70-80):(10-30).

[0046] The beneficial effect of the above step is that the dried ball material with the amino-containing modified B-based powder and the hydroxyl-modified silicon-based powder are mixed and then added to a ball milling device for liquid-free grinding, which is beneficial to avoid the problems of crystallization and crystal growth of the B-based powder and the silicon-based powder.

[0047] By adjusting the particle size D50 of the hydroxyl-modified silicon-based powder to 100-200 nm, the particle size of the hydroxyl-modified silicon-based powder is greater than that of the amino-containing modified B-based powder, which is beneficial to realize the coating of the amino-containing modified B-based powder on the surface of the hydroxyl-modified silicon-based powder, and also beneficial to avoid the problems of uneven coating of the amino-containing modified B-based powder on the hydroxyl-modified silicon-based powder or damage to the structure of the amino-containing modified B-based powder caused by the too large particle size of the hydroxyl-modified silicon-based powder.

[0048] By adding magnesium carbonate, it is beneficial to play a lubricating role in the ball milling process, and it is beneficial to avoid damage to the structure of the silicon-based powder and the B-based powder.

[0049] Further, during the secondary drying process of the mixed powder, the drying temperature is 300-400℃, and the drying time is 1-3 h.

[0050] The beneficial effect of the above step is that the combination strength of the hydroxyl-modified silicon-based powder and the modified B-based powder containing amino is increased, and the formation of the -N-H-O-H- structure with high strength is achieved by drying at a temperature of 300-400 DEG C, and the problems of crystallization or grain growth of the silicon-based and B-based materials caused by excessively high temperature are avoided. DETAILED DESCRIPTION

[0051] In order to better understand the technical solutions of the present application, the present application will be further described below in combination with specific examples.

[0052] Example 1

[0053] The present embodiment provides a method for preparing a single-dose multi-spectrum cold smoke screen jamming material, comprising the following steps:

[0054] The B-based powder is modified once to obtain a hydroxyl-modified B-based powder; the specific process for preparing the hydroxyl-modified B-based powder comprises:

[0055] The first solution and the B-based powder are mixed in a ball milling device at a mass ratio of 7:93, and heating is performed at 135 DEG C during the mixing process, and the mixing time is 2.5 h; then the obtained mixture is dried to obtain the hydroxyl-modified B-based powder;

[0056] The particle size D50 of the B-based powder is 75 nm; the first solution is water; and the volume ratio of the first solution to the ball material in the ball milling device is 50:50.

[0057] The hydroxyl-modified B-based powder is mixed with the ball material and modified again to obtain a modified B-based powder containing amino; the modified B-based powder containing amino is attached to the surface of the ball material;

[0058] The specific process for preparing the modified B-based powder containing amino and attaching it to the surface of the ball material comprises the following steps:

[0059] The hydroxyl-modified B-based powder, cetyltrimethylammonium bromide and polyvinyl alcohol are added to the ball milling device and mixed; the mass ratio of the hydroxyl-modified B-based powder to the ball material in the ball milling device is 90:125; heating is performed during the mixing process, and the mixing time is 3 h;

[0060] The mass ratio of the hydroxyl-modified B-based powder, cetyltrimethylammonium bromide and polyvinyl alcohol is 90:2.6:10; and the heating temperature during the secondary modification process is 115 DEG C;

[0061] The modified B-based powder containing amino is obtained, and the modified B-based powder containing amino is attached to the surface of the ball material.

[0062] The ball material with the modified B-based powder containing amino groups attached thereon is subjected to primary drying; the temperature for the primary drying of the ball material with the modified B-based powder containing amino groups attached thereon is 115 DEG C, and the drying time is 7 h.

[0063] The silicon-based powder is subjected to three modifications to obtain a hydroxyl-modified silicon-based powder; the process for preparing the hydroxyl-modified silicon-based powder specifically comprises the following steps:

[0064] The silane coupling agent and the silicon-based powder are mixed in a mass ratio of 6:94 in a grinding device, and heating is performed during the mixing process; the heating temperature is 175 DEG C, and the mixing time is 2.5 h; then the obtained mixture is dried to obtain the hydroxyl-modified silicon-based powder; the silane coupling agent is aminopropyl triethoxysilane.

[0065] The ball material with the modified B-based powder containing amino groups attached thereon after drying and the hydroxyl-modified silicon-based powder are mixed and then subjected to liquid-free grinding to obtain a mixed powder; the specific process is as follows:

[0066] The ball material with the modified B-based powder containing amino groups attached thereon after drying and the hydroxyl-modified silicon-based powder are mixed and then added into a ball grinding device for liquid-free grinding, and then magnesium carbonate is added for ball grinding mixing; the mixing time is 45 h; then the powder material in the ball grinding device is taken out to obtain the mixed powder;

[0067] The particle size D50 of the hydroxyl-modified silicon-based powder is 150 nm.

[0068] The mass ratio of the modified B-based powder containing amino groups on the surface of the ball material, the hydroxyl-modified silicon-based powder, and the magnesium carbonate is 12:75:20.

[0069] The mixed powder is subjected to secondary drying to obtain a single-agent multi-spectrum cold smoke jamming material; during the secondary drying of the mixed powder, the drying temperature is 350 DEG C, and the drying time is 2 h.

[0070] The single-agent multi-spectrum cold smoke jamming material has a single particle characteristic, and the single-agent multi-spectrum cold smoke jamming material has a core-shell structure; the core is a hydroxyl-modified silicon-based powder, and the core-shell coated outside the core is a modified B-based powder containing amino groups;

[0071] The B-based powder is B powder; and the silicon-based powder is silicon powder.

[0072] The single-agent multi-spectrum cold smoke jamming material has a visible light attenuation rate of >99.22%, an infrared light attenuation rate of >99.16%, a medium infrared light attenuation rate of >96.86%, a far infrared light attenuation rate of >98.55%, a laser attenuation rate of >95.59% at a wavelength of 1.06 μm, a laser attenuation rate of >97.62% at a wavelength of 10.6 μm, and an effective shielding of >125 s; the bulk density is 0.55 g / cm 3; resistivity ≥ 10 5 Ω.m.

[0073] Example 2

[0074] The same content as example 1 will not be repeated; the different scheme of this example and example 1 is as follows:

[0075] The embodiment provides a method for preparing single-dose multi-spectrum cold smoke curtain interference material, further comprising the following steps that: the first solution and B-based powder are mixed in a ball milling device according to a mass ratio of 9:94, heating is carried out in the mixing process, the heating temperature is 143 DEG C, and the mixing time is 2.2h; then the obtained mixed material is dried to obtain hydroxyl-modified B-based powder;

[0076] The particle size D50 of the B-based powder is 90nm; the first solution is ethanol; and the volume ratio of the ball material in the ball milling device is 54:50.

[0077] The mass ratio of the hydroxyl-modified B-based powder and the ball material in the ball milling device is 91:140;

[0078] Secondary modification heating is carried out in the mixing process, the mixing time is 2.6h, the mass ratio of the hydroxyl-modified B-based powder, cetyltrimethylammonium bromide and polyvinyl alcohol is 91:4.6:11, and the secondary modification heating temperature is 118 DEG C;

[0079] The temperature for once drying the ball material with the modified B-based powder attached with amino groups is 118 DEG C, and the drying time is 6.5h.

[0080] The silane coupling agent and the silicon-based powder are mixed in a grinding device according to a mass ratio of 7:95, then 95% ethanol is added, the mass ratio of the 95% ethanol and the silane coupling agent is 7:9, heating is carried out in the mixing process, the heating temperature is 180 DEG C, and the mixing time is 2.2h; then the obtained mixed material is dried to obtain hydroxyl-modified silicon-based powder; the silane coupling agent is aminopropyltrimethoxysilane.

[0081] The ball material with the modified B-based powder attached with amino groups after drying and the hydroxyl-modified silicon-based powder are mixed and then added into a ball milling device to carry out liquid-free grinding, then magnesium carbonate is added to carry out ball milling mixing, the mixing time is 43h, then the powder material in the ball milling device is taken out to obtain mixed powder;

[0082] The particle size D50 of the hydroxyl-modified silicon-based powder is 180nm;

[0083] The mass ratio of the modified B-based powder with amino groups on the surface of the ball material, the hydroxyl-modified silicon-based powder and the magnesium carbonate is 18:78:25.

[0084] The drying temperature is 386 DEG C, and the drying time is 1.6 h.

[0085] The B-based powder is a B-containing compound; and the silicon-based powder is a silicon-containing compound.

[0086] The single-agent multi-spectrum cold smoke screen interference material has an attenuation rate of >99.35% for visible light, >99.26% for infrared light, >96.98% for medium infrared light, >98.85% for far infrared light, >95.68% for laser light with a wavelength of 1.06 microns, >97.82% for laser light with a wavelength of 10.6 microns, and an effective shielding time of >120 s; and the bulk density is 0.58 g / cm 3 .

[0087] Example 3

[0088] The same content as in Example 1 is not repeated in this example; and the different scheme in this example from Example 1 is as follows:

[0089] The example provides a method for preparing a single-agent multi-spectrum cold smoke screen interference material, a first solution and a B-based powder are mixed in a ball milling device at a mass ratio of 6:91, heating is performed during the mixing process, the heating temperature is 128 DEG C, and the mixing time is 2.8 h; then the obtained mixture is dried to obtain a hydroxyl-modified B-based powder.

[0090] The particle size D50 of the B-based powder is 60 nm; the first solution comprises water and ethanol, and the volume ratio of water to ethanol is 3:7; and the volume ratio of the first solution to the ball material in the ball milling device is 46:48.

[0091] The mass ratio of the hydroxyl-modified B-based powder to the ball material in the ball milling device is 89:110.

[0092] Secondary modification heating is performed during the mixing process, and the mixing time is 3.8 h.

[0093] The mass ratio of the hydroxyl-modified B-based powder, cetyltrimethylammonium bromide, and polyvinyl alcohol is 89:0.8:9; and the secondary modification heating temperature is 112 DEG C.

[0094] The temperature for primary drying of the ball material with the modified B-based powder containing amino groups attached is 106 DEG C, and the drying time is 7.8 h.

[0095] The silane coupling agent and the silicon-based powder are mixed in a mass ratio of 5:93 in a grinding device, then 95% volume ratio of ethanol is added, and the mass ratio of 95% ethanol to the silane coupling agent is 5:6; heating is performed during the mixing process, the heating temperature is 168 DEG C, the mixing time is 2.8h; then the obtained mixture is dried to obtain the hydroxyl-modified silicon-based powder; the silane coupling agent is urea propyl triethoxysilane.

[0096] The ball material containing the amino-modified B-based powder and the hydroxyl-modified silicon-based powder after drying are mixed and then added to a ball milling device for liquid-free grinding, then magnesium carbonate is added for ball milling mixing, the mixing time is 49h, then the powder material in the ball milling device is taken out to obtain a mixed powder;

[0097] The particle size D50 of the hydroxyl-modified silicon-based powder is 110nm;

[0098] The mass ratio of the amino-modified B-based powder on the surface of the ball material, the hydroxyl-modified silicon-based powder and the magnesium carbonate is 8:72:12.

[0099] During the secondary drying process of the mixed powder, the drying temperature is 310 DEG C, and the drying time is 2.8h.

[0100] The single-agent multi-spectrum cold smoke screen interference material has a visible light attenuation rate of >98.89%, an infrared light attenuation rate of >98.86%, a medium infrared light attenuation rate of >95.89%, a far infrared light attenuation rate of >97.96%, a laser attenuation rate of >94.98% at a wavelength of 1.06 microns, a laser attenuation rate of >96.89% at a wavelength of 10.6 microns, and an effective shielding of >130s; the bulk density is 0.52g / cm 3 .

[0101] The above description is only the preferred embodiment of the present application and the explanation of the applied technical principles, and those skilled in the art should understand that the scope of the application involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, and also covers other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept, for example, the technical solutions formed by mutually replacing the above features and the technical features disclosed in the present application (but not limited to) having similar functions.

Claims

1. A method for preparing a single-agent multi-spectral cold smoke screen interference material, characterized in that, Includes the following steps: Hydroxyl-modified B-based powder was prepared by modifying B-based powder in one step. Hydroxyl-modified B-based powder is mixed with spherical material and then subjected to secondary modification to obtain amino-containing modified B-based powder; the amino-containing modified B-based powder adheres to the surface of the spherical material. The pellets containing modified B-based powder with amino groups are dried once. The silicon-based powder was modified three times to obtain hydroxyl-modified silicon-based powder; After drying, the spherical material with modified B-based powder containing amino groups and the hydroxyl-modified silicon-based powder are mixed and then ground without liquid to obtain a mixed powder. The mixed powder is dried a second time to obtain a single-agent multi-spectral cold smoke screen interference material. The single-agent multi-spectral cold smoke screen interference material has single-particle characteristics. The single-agent multi-spectral cold smoke screen interference material has a core-shell structure, with the core being a hydroxyl-modified silicon-based powder and the core-shell coating the outside of the core being an amino-modified B-based powder.

2. The method for preparing a single-agent multi-spectral cold smoke screen interference material according to claim 1, characterized in that, The specific process for preparing hydroxyl-modified B-based powder includes: The first solution and B-based powder are mixed in a ball mill at a mass ratio of (5-10):(90-95). The mixture is heated during the mixing process at a temperature of 125-145℃ for 2-3 hours. The resulting mixture is then dried to obtain hydroxyl-modified B-based powder.

3. The method for preparing a single-agent multi-spectral cold smoke screen interference material according to claim 2, characterized in that, The particle size D50 of the B-based powder is 50-100 nm. The first solution comprises water and / or ethanol; The volume ratio of the first solution to the ball milling equipment is (45-55):(45-55).

4. The method for preparing a single-agent multi-spectral cold smoke screen interference material according to claim 1, characterized in that, The specific process for preparing amino-modified B-based powder and attaching it to the surface of spherical material includes the following steps: Hydroxyl-modified B-based powder and hexadecyltrimethylammonium bromide were added to a ball mill and mixed with polyvinyl alcohol. Heating is carried out during the mixing process, and the mixing and heating time is 2-4 hours; A modified B-based powder containing amino groups was obtained, and the modified B-based powder containing amino groups adhered to the surface of the spherical material.

5. The method for preparing a single-agent multi-spectral cold smoke screen interference material according to claim 4, characterized in that, The mass ratio of the hydroxyl-modified B-based powder, hexadecyltrimethylammonium bromide, and polyvinyl alcohol is (88-92):(0.3-5):(8-12). The heating temperature during the secondary modification process is 110-120℃.

6. The method for preparing a single-agent multi-spectral cold smoke screen interference material according to claim 5, characterized in that, The mass ratio of hydroxyl-modified B-based powder to the ball milling material is (88-92):(100-150).

7. The method for preparing a single-agent multi-spectral cold smoke screen interference material according to claim 1, characterized in that, The temperature for drying the spherical material with modified B-based powder containing amino groups is 100-120℃, and the drying time is 6-8h.

8. The method for preparing a single-agent multi-spectral cold smoke screen interference material according to claim 1, characterized in that, The process of preparing hydroxyl-modified silicon-based powder specifically includes the following steps: Silane coupling agent and silicon-based powder are mixed in a grinding equipment at a mass ratio of (4-8):(92-96). During the mixing process, the mixture is heated at a temperature of 165-185℃ for 2-3 hours. The resulting mixture is then dried to obtain hydroxyl-modified silicon-based powder. The silane coupling agent includes one of aminopropyltriethoxysilane, aminopropyltrimethoxysilane, and ureapropyltriethoxysilane.

9. The method for preparing a single-agent multi-spectral cold smoke screen interference material according to claim 1, characterized in that, After drying, the ball material containing amino-modified B-based powder and the hydroxyl-modified silicon-based powder are mixed and then added to a ball mill for liquid-free grinding. Then, magnesium carbonate is added and ball milling is carried out for 40-50 hours. The powder material is then taken out from the ball mill to obtain the mixed powder. The hydroxyl-modified silicon-based powder has a particle size D50 of 100-200 nm; The mass ratio of amino-modified B-based powder, hydroxyl-modified silicon-based powder, and magnesium carbonate on the surface of the ball material is (5-20):(70-80):(10-30).

10. The method for preparing a single-agent multi-spectral cold smoke screen interference material according to claim 2, characterized in that, During the secondary drying process of the mixed powder, the drying temperature is 300-400℃ and the drying time is 1-3h.