A fatty rock silica-based metal coating and preparation method thereof

Abstract

The present invention discloses a fat rock silica-based metal coating and a preparation method thereof, which includes a metal base layer, a heat insulation layer, a wave absorption layer and a coating layer. After the metal base layer, the heat insulation layer, the wave absorption layer and the coating layer are stacked layer by layer, they are made into a fat rock silica-based metal coating through microwave low-temperature sintering. The present invention relates to the technical field of functional coatings. The fat rock silica-based metal coating and the preparation method thereof produce porous, ultra-light and fine fat rock silica with a pore diameter between a few micrometers and nanometers, which is insoluble in water, non-toxic and odorless, and has good sound absorption and wave absorption functions. By using the ability of ferrite, carbon fiber and graphene to absorb electromagnetic waves and generate magnetic short-circuit eddy current heat to eliminate the reflection ability of electromagnetic waves, various radar receivers cannot receive the signals of electromagnetic waves, achieving the purpose of stealth. While having excellent wave absorption performance, the whole has better waterproof, high-temperature resistance, wave absorption and sound absorption performance.

Description

Technical Field

[0001] The present invention relates to the technical field of functional coatings, and particularly to a fatty rock silica-based metal coating and a preparation method thereof. Background Art

[0002] As a high-end equipment technology, wave-absorbing, sound-absorbing and stealth materials are widely used in military equipment. Currently, in the era of war electronic informatization, materials such as wave-absorbing, sound-absorbing and stealth materials are extremely important. For example, war vehicles, tanks, artillery, and fighter jets and missiles may all be exposed within the fire control range of the other party. Once exposed, the risk factor is extremely high.

[0003] Wave-absorbing materials can also be divided into two types from the material composition. One is the coated wave-absorbing material, and the other is the structural wave-absorbing and stealth material. The coated wave-absorbing material is made by adding wave-absorbing agents to a resin-based or rubber-based material. This kind of wave-absorbing material is easy to construct and can be constructed by brushing or spraying methods, and can be applied to complex curved surfaces, such as wave-absorbing coatings / stealth coatings. However, this kind of coated material has the problem of weather resistance. Since it adheres to the surface of the aircraft, the surface adhesion gradually decreases and even falls off with the change of service life and climate, and at the same time, it also faces problems such as subsequent maintenance and repair; the structural wave-absorbing material usually uses a resin / fiber reinforced composite material as a carrier and adds an absorber to make it. It is a multi-functional composite material that can not only bear the structure as a structural member, having the advantages of light weight and high strength of the composite material, but also can better absorb or transmit electromagnetic waves, and has become an important development direction of current stealth materials.

[0004] For example, the ore powder particle separation equipment described in the patent number ZL201620487705.5 separates high-density molecules and low-density molecules, heavy metal elements and non-metal elements, and other precious metal elements. Simply pursuing the wave-absorbing and sound-absorbing functions cannot ensure the effective use of the coating structure in the actual harsh environment. For this, corresponding coating structure improvements are often made for the harsh environment. For example, in a high-temperature environment, the high-temperature resistance is strengthened, and in a rainy environment, the waterproof aspect is improved. Such settings, due to the variability of the harsh environment during the actual use process, often result in the service life of the conventional wave-absorbing coating structure not reaching the expected effect. Summary of the Invention

[0005] (I) Technical Problems to be Solved

[0006] Aiming at the deficiencies of the prior art, the present invention provides a fatty rock silica-based metal coating and a preparation method thereof, which solves the problem that the service life of the conventional wave-absorbing coating structure often fails to reach the expected effect.

[0007] (II) Technical Solutions

[0008] To achieve the above object, the present invention provides the following technical solutions: A fat rock silica-based metal coating, comprising a metal base layer, a heat insulation layer, an electromagnetic wave absorbing layer, and a coating layer. After the metal base layer, the heat insulation layer, the electromagnetic wave absorbing layer, and the coating layer are stacked layer by layer, they are made into a fat rock silica-based metal coating through microwave low-temperature sintering. The metal base layer is composed of one or more of a metal mesh sheet and a metal plate. The heat insulation layer is disposed on top of the metal base layer. The raw materials of the heat insulation layer include, by weight parts: 46-85 parts of fat rock silica: 10-17 parts of graphene fiber: 1-3 parts of binder. The electromagnetic wave absorbing layer is disposed on top of the heat insulation layer. The raw materials of the electromagnetic wave absorbing layer include, by weight parts: 60-85 parts of fat rock silica: 18-45 parts of ferrite: 9-16 parts of carbon fiber: 2-5 parts of binder. The coating layer is disposed on top of the electromagnetic wave absorbing layer and is prepared from an active silicon material.

[0009] By adopting the above technical solutions, the use of ferrite, carbon fiber, and graphene with the ability to absorb electromagnetic waves to generate magnetic short-circuit eddy current heat eliminates the reflection ability of electromagnetic waves, so that various radar receivers cannot receive the signals of electromagnetic waves, achieving the purpose of stealth. While having excellent electromagnetic wave absorption performance, the coating is assembled in a layered stacking form and combined with low-temperature sintering to strengthen the structure, ensuring the overall stability of the structure and making the connection between the coating layers closer, so that the whole has better waterproof, high-temperature resistance, electromagnetic wave absorption, and sound absorption performance.

[0010] The present invention is further configured as: The raw materials of the heat insulation layer include, by weight parts: 46 parts of fat rock silica: 17 parts of graphene fiber: 3 parts of binder. The raw materials of the electromagnetic wave absorbing layer include, by weight parts: 85 parts of fat rock silica: 18 parts of ferrite: 16 parts of carbon fiber: 2 parts of binder.

[0011] The present invention is further configured as: The raw materials of the heat insulation layer include, by weight parts: 70 parts of fat rock silica: 12 parts of graphene fiber: 2 parts of binder. The raw materials of the electromagnetic wave absorbing layer include, by weight parts: 60 parts of fat rock silica: 45 parts of ferrite: 9 parts of carbon fiber: 5 parts of binder.

[0012] The present invention is further configured as: The raw materials of the heat insulation layer include, by weight parts: 85 parts of fat rock silica: 10 parts of graphene fiber: 1 part of binder. The raw materials of the electromagnetic wave absorbing layer include, by weight parts: 75 parts of fat rock silica: 30 parts of ferrite: 12 parts of carbon fiber: 4 parts of binder.

[0013] The present invention also discloses a preparation method of a fat rock silica-based metal coating, which specifically includes the following steps:

[0014] Step 1. Material preparation: After crushing the stone raw materials, which include but are not limited to rocks with high density, waste ores, and pebbles, grind them, and obtain nano-scale fine powder after screening through a 1000-mesh to 3000-mesh sieve. After decomposing and screening the nano-scale fine powder using an electronic decomposition device, and then through granulation and puffing, obtain fatty rock silica;

[0015] Step 2. Ingredient preparation: Put part of the fatty rock silica prepared in Step 1 into a blender, add graphene fibers and sodium potassium silicate, and stir at a speed of 1000 - 2500 r / min for 10 - 15 min to obtain ingredient A. Put part of the fatty rock silica prepared in Step 1 into a blender, add ferrite, carbon fiber, and sodium potassium silicate, and stir at a speed of 1000 - 2500 r / min for 10 - 15 min to obtain ingredient B;

[0016] Step 3. Coating molding: Place the metal base layer in the mold cavity of the lower template, then evenly coat ingredient A in Step 2 on the metal base layer to obtain a heat-insulating layer. Then evenly coat ingredient B on the heat-insulating layer to obtain an electromagnetic wave absorbing layer. Then press down the upper template and extrude the metal base layer, heat-insulating layer, and electromagnetic wave absorbing layer in the lower template for 1 - 3 min to obtain a stealth matrix;

[0017] Step 4. Coating sintering: Apply active silicon on the surface of the stealth matrix prepared in Step 3 to obtain a semi-finished product. Place the semi-finished product in a sintering furnace and perform microwave low-temperature sintering at 400°C - 1000°C to obtain a finished product.

[0018] Through the above technical solution, porous, ultra-light and fine fatty rock silica is produced, with its pore size between micrometers and nanometers. It is insoluble in water, non-toxic and odorless, has good sound absorption and electromagnetic wave absorption functions, effectively guarantees the electromagnetic wave absorption function of the coating, enables the coating to have excellent waterproof effect, and is shaped by sintering, ensuring the long-term use stability of the overall structure while having good fireproof and heat-insulating effects.

[0019] (III) Beneficial effects

[0020] The present invention provides a fatty rock silica-based metal coating and a preparation method. It has the following beneficial effects:

[0021] (1) The fatty rock silica-based metal coating and its preparation method eliminate the reflection ability of electromagnetic waves by utilizing the electromagnetic wave absorption and magnetic short-circuit eddy current heating of ferrite, carbon fiber, and graphene, so that various radar receivers cannot receive the signals of electromagnetic waves, achieving the purpose of stealth. While having excellent wave absorption performance, the coating is assembled in a form of layer-by-layer stacking and combined with low-temperature sintering to stabilize the structure. While ensuring the overall stability of the structure, the connection between the coatings is closer, making the whole have better waterproof, high-temperature resistance, wave absorption, and sound absorption performance.

[0022] (2) The fatty rock silica-based metal coating and its preparation method produce porous, ultra-light, and fine fatty rock silica with pore diameters between micrometers and nanometers. It is insoluble in water, non-toxic, and odorless, and has good sound absorption and wave absorption functions. While effectively ensuring the wave absorption function of the coating, it makes the coating have excellent waterproof effect, and is shaped by sintering. While ensuring the long-term use stability of the overall structure, it has good fireproof and heat insulation effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic diagram of the external structure of the present invention;

[0024] Figure 2 is a schematic diagram of the comparative detection results of the present invention.

[0025] In the figure, 1, metal base layer; 2, heat insulation layer; 3, wave absorption layer; 4, coating layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0027] Please refer to Figure 1-2 , the embodiments of the present invention provide the following technical solutions:

[0028] Example 1

[0029] A preparation method of a fatty rock silica-based metal coating specifically includes the following steps:

[0030] Step 1: Material preparation: After crushing the stone raw materials, grind them to obtain nano-scale fine powder. Use an electronic decomposition device to decompose and screen the nano-scale fine powder, and after granulation and expansion, obtain fatty rock silica;

[0031] Step 2. Ingredient preparation: Put 46 parts of the fat rock silica prepared in Step 1 into a blender, add 17 parts of graphene fiber and 3 parts of sodium potassium silicate, and stir at a speed of 1000 r / min for 15 min to obtain Ingredient A. Put 85 parts of the fat rock silica prepared in Step 1 into a blender, add 18 parts of ferrite, 16 parts of carbon fiber and 2 parts of sodium potassium silicate, and stir at a speed of 2500 r / min for 10 min to obtain Ingredient B;

[0032] Step 3. Coating molding: Place the metal base layer 1 in the mold cavity of the lower template. Subsequently, evenly coat Ingredient A in Step 2 on the metal base layer 1 to obtain the heat insulation layer 2. Then, evenly coat Ingredient B on the heat insulation layer 2 to obtain the wave-absorbing layer 3. Subsequently, press down the upper template and extrude the metal base layer 1, the heat insulation layer 2 and the wave-absorbing layer 3 in the lower template for 1 min to obtain the stealth matrix;

[0033] Step 4. Coating sintering: Apply active silicon on the surface of the stealth matrix prepared in Step 3 to obtain a semi-finished product. Place the semi-finished product in a sintering furnace and perform microwave low-temperature sintering to obtain the finished product.

[0034] In this embodiment, the density comprehensive specific gravity, compressive strength, and thermal conductivity at -10°C and +40°C of the obtained finished product are detected. The results are as shown in the appendix Figure 2 As shown. When the finished product prepared in this embodiment is used as a wall, compared with the wall indexes of the industry, this embodiment has the advantages of significantly low density comprehensive specific gravity, high compressive strength, and low thermal conductivity.

[0035] Example 2

[0036] A preparation method of a fat rock silica-based metal coating specifically includes the following steps:

[0037] Step 1. Material preparation: After crushing the stone raw material, grind it to obtain nano-scale fine powder. Use an electronic decomposition device to decompose and screen the nano-scale fine powder, and after granulation and puffing, obtain fat rock silica;

[0038] Step 2. Ingredient preparation: Put 70 parts of the fat rock silica prepared in Step 1 into a blender, add 12 parts of graphene fiber and 2 parts of sodium potassium silicate, and stir at a speed of 1800 r / min for 13 min to obtain Ingredient A. Put 60 parts of the fat rock silica prepared in Step 1 into a blender, add 45 parts of ferrite, 9 parts of carbon fiber and 5 parts of sodium potassium silicate, and stir at a speed of 1000 r / min for 15 min to obtain Ingredient B;

[0039] Step 3. Coating and molding: Place the metal base layer 1 in the mold cavity of the lower template. Subsequently, evenly coat the ingredient A in Step 2 on the metal base layer 1 to obtain the heat-insulating layer 2. Then, evenly coat the ingredient B on the heat-insulating layer 2 to obtain the wave-absorbing layer 3. Subsequently, press down the upper template and extrude the metal base layer 1, the heat-insulating layer 2, and the wave-absorbing layer 3 in the lower template for 2 minutes to obtain the stealth matrix;

[0040] Step 4. Smearing and sintering: Smear active silicon on the surface of the stealth matrix prepared in Step 3 to obtain a semi-finished product. Place the semi-finished product in a sintering furnace and perform microwave low-temperature sintering to obtain the finished product.

[0041] In this embodiment, the density comprehensive specific gravity, compressive strength, and thermal conductivity at -10°C and +40°C of the obtained finished product are detected. The results are as follows Figure 2 shown. When using the finished product prepared in this embodiment as a wall, compared with the wall indexes of the industry, this embodiment has the advantages of significantly low density comprehensive specific gravity, high compressive strength, and low thermal conductivity.

[0042] Example 3

[0043] A preparation method of a fat rock silica-based metal coating specifically includes the following steps:

[0044] Step 1. Material preparation: After crushing the stone raw material, perform grinding to obtain nano-scale fine powder. Use an electronic decomposition device to decompose and screen the nano-scale fine powder, and after granulation and expansion, obtain fat rock silica;

[0045] Step 2. Ingredient preparation: Put 85 parts of the fat rock silica prepared in Step 1 into a blender, add 10 parts of graphene fiber and 1 part of sodium potassium silicate, and stir at a speed of 2500 r / min for 10 minutes to obtain ingredient A. Put 75 parts of the fat rock silica prepared in Step 1 into a blender, add 30 parts of ferrite, 12 parts of carbon fiber, and 4 parts of sodium potassium silicate, and stir at a speed of 1800 r / min for 12 minutes to obtain ingredient B;

[0046] Step 3. Coating and molding: Place the metal base layer 1 in the mold cavity of the lower template. Subsequently, evenly coat the ingredient A in Step 2 on the metal base layer 1 to obtain the heat-insulating layer 2. Then, evenly coat the ingredient B on the heat-insulating layer 2 to obtain the wave-absorbing layer 3. Subsequently, press down the upper template and extrude the metal base layer 1, the heat-insulating layer 2, and the wave-absorbing layer 3 in the lower template for 3 minutes to obtain the stealth matrix;

[0047] Step 4. Smearing and sintering: Smear active silicon on the surface of the stealth matrix prepared in Step 3 to obtain a semi-finished product. Place the semi-finished product in a sintering furnace and perform microwave low-temperature sintering to obtain the finished product.

[0048] In this embodiment, the density comprehensive specific gravity, compressive strength, and thermal conductivity at -10°C and +40°C of the prepared finished product are detected, and the results are as shown in the appendix Figure 2 As shown, when the finished product prepared by this embodiment is used as a wall, compared with the wall indexes of the industry, this embodiment has the advantages of significantly low density comprehensive specific gravity, high compressive strength, and low thermal conductivity.

[0049] As a detailed description, after the wave absorption detection and fire protection detection of the finished product prepared in the above embodiment, it can be seen that the fatty rock silica-based metal coating prepared by the present invention has a good wave absorption effect on sound waves, meter waves, millimeter waves, microwaves, etc. with frequencies of 1 - 2000 MHz in terms of wave absorption function. In terms of fire protection and heat insulation function, at 1400°C, it still has excellent fire protection effect, and the fire protection level reaches A2 level. Moreover, the specific gravity is as low as 0.2 - 0.5, and it also has the functions of anti-aging and anti-corrosion, is insoluble in water, and is non-toxic and odorless.

[0050] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A metal coating based on fat rock silica, comprising a metal base layer (1). Characterized in that a heat insulation layer (2) is provided on the top of the metal base layer (1). The raw materials of the heat insulation layer (2) include, by weight parts: 46 - 85 parts of fat rock silica, 10 - 17 parts of graphene fiber, and 1 - 3 parts of binder. An absorbing layer (3) is provided on the top of the heat insulation layer (2). The raw materials of the absorbing layer (3) include, by weight parts: 60 - 85 parts of fat rock silica, 18 - 45 parts of ferrite, 9 - 16 parts of carbon fiber, and 2 - 5 parts of binder. A coating layer (4) is provided on the top of the absorbing layer (3), and the coating layer (4) is prepared from an active silicon material; the binder is made of sodium potassium silicate; Its preparation method specifically includes the following steps: Step 1, material preparation: After crushing the stone raw materials, grind them to obtain nanoscale fine powder. Use an electronic decomposition device to decompose and screen the nanoscale fine powder, and after granulation and expansion, obtain fat rock silica; Step 2, ingredient preparation: Put part of the fat rock silica obtained in Step 1 into a mixer, add graphene fiber and binder, and stir at a speed of 1000 - 2500 r / min for 10 - 15 min to obtain ingredient A. Put part of the fat rock silica obtained in Step 1 into a mixer, add ferrite, carbon fiber and binder, and stir at a speed of 1000 - 2500 r / min for 10 - 15 min to obtain ingredient B; Step 3, coating molding: Place the metal base layer (1) in the mold cavity of the lower template, then evenly coat ingredient A in Step 2 on the metal base layer (1) to obtain the heat insulation layer (2). Then evenly coat ingredient B on the heat insulation layer (2) to obtain the absorbing layer (3). Then press down the upper template and extrude the metal base layer (1), heat insulation layer (2) and absorbing layer (3) in the lower template for 1 - 3 min to obtain a stealth matrix; Step 4, coating sintering: Apply active silicon on the surface of the stealth matrix obtained in Step 3 to obtain a semi-finished product. Place the semi-finished product in a sintering furnace and carry out microwave low-temperature sintering to obtain a finished product.

2. A metal coating based on fat rock silica according to claim 1, Characterized in that the raw materials of the heat insulation layer (2) include, by weight parts: 46 parts of fat rock silica, 17 parts of graphene fiber, and 3 parts of binder. The raw materials of the absorbing layer (3) include, by weight parts: 85 parts of fat rock silica, 18 parts of ferrite, 16 parts of carbon fiber, and 2 parts of binder.

3. A metal coating based on fat rock silica according to claim 1, Characterized in that the raw materials of the heat insulation layer (2) include, by weight parts: 70 parts of fat rock silica, 12 parts of graphene fiber, and 2 parts of binder. The raw materials of the absorbing layer (3) include, by weight parts: 60 parts of fat rock silica, 45 parts of ferrite, 9 parts of carbon fiber, and 5 parts of binder.

4. A metal coating based on fat rock silica according to claim 1, Characterized in that The raw materials of the heat insulation layer (2) include, by weight parts: 85 parts of fat rock silica, 10 parts of graphene fiber, and 1 part of binder. The raw materials of the wave absorbing layer (3) include, by weight parts: 75 parts of fat rock silica, 30 parts of ferrite, 12 parts of carbon fiber, and 4 parts of binder.

5. A fat rock silica-based metal coating according to claim 1, characterized in that the nano-scale fine powder in the first step is obtained by screening through a sieve with 1000 mesh - 3000 mesh.

6. A fat rock silica-based metal coating according to claim 1, characterized in that the metal base layer (1) is composed of one or more of a metal mesh sheet and a metal plate.

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