CN111234637A - Water-based wave-absorbing coating for camouflage net, double-layer structured camouflage net prepared from water-based wave-absorbing coating and preparation method of water-based wave-absorbing coating - Google Patents
Water-based wave-absorbing coating for camouflage net, double-layer structured camouflage net prepared from water-based wave-absorbing coating and preparation method of water-based wave-absorbing coating Download PDFInfo
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- CN111234637A CN111234637A CN202010250069.5A CN202010250069A CN111234637A CN 111234637 A CN111234637 A CN 111234637A CN 202010250069 A CN202010250069 A CN 202010250069A CN 111234637 A CN111234637 A CN 111234637A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
- C09D133/04—Homopolymers or copolymers of esters
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/32—Radiation-absorbing paints
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/20—Diluents or solvents
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/003—Additives being defined by their diameter
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
Abstract
The invention relates to the field of wave-absorbing materials, in particular to a water-based wave-absorbing coating for a camouflage net, a water-based wave-absorbing coating for the camouflage net, a camouflage net with a double-layer structure prepared from the water-based wave-absorbing coating and a preparation method of the water-based wave-absorbing coating. The water-based wave-absorbing coating for the camouflage net comprises the following components in parts by weight: 15-25 parts of distilled water, 65-75 parts of acrylic resin, 3 parts of granulating carbon black, 4-6 parts of carbon black, 1-3 parts of graphite, 1.5-2 parts of dispersant 750W, 0.1-0.3 part of defoamer, 0.4-0.5 part of hydroxyethyl cellulose and 1.5 parts of cross-linking agent. The invention also discloses a double-layer structure camouflage net which comprises base cloth and the water-based wave-absorbing coating, wherein the base cloth of the camouflage net is made of terylene oxford, and the surface of the oxford is coated with the water-based wave-absorbing coating. The prepared double-layer structure camouflage net improves the environment resistance and greatly improves the wave-absorbing frequency band and the wave-absorbing performance.
Description
Technical Field
The invention relates to the field of wave-absorbing materials, in particular to a wave-absorbing coating for a camouflage net and a preparation method thereof.
Background
The camouflage stealth is an important component of the battle security and is an effective means for resisting military reconnaissance and attack. Under the condition of high-tech warfare, the role and the status of camouflage are more prominent. The radar detection is the most widely used technology in military investigation, and the modern radar detection technology is quite mature, wide in detection frequency band and strong in identification capability. The method poses great threat to battlefield survival of weaponry such as tanks and vehicles. The research and development of the camouflage technology are emphasized by the outside military, various camouflage and stealth devices aiming at radar detection systems are researched and developed successively from world war II to present, and the technological content of the camouflage and stealth devices is higher and higher. The products developed at home and abroad at present comprise radar stealth paint, stealth grass, stealth tarpaulin, camouflage net and the like. The camouflage net is one of the most basic, effective and cost-effective camouflage apparatuses. The camouflage stealth equipment can reduce and eliminate various exposed characteristics of the target, conceal the existence of the target and has the best camouflage effect. The radar wave stealth mechanism for camouflage nets can be described as follows: the electromagnetic wave transmitted by the radar antenna is partially scattered to the periphery by the outer layer structure of the camouflage net, and partially enters the double-layer structure of the camouflage net, and is scattered and absorbed for many times through the interlayer space, so that the electromagnetic energy is attenuated to the maximum extent, a broadband absorption effect is obtained, and the radar target characteristic of vehicle equipment, namely RCS signals, is weakened to the minimum degree. In terms of the camouflage net, the wave absorbing performance of the camouflage net is mainly dependent on a wave absorbing coating system used by the camouflage net except for being related to the structure of the erected camouflage net. The existing camouflage net wave absorbing layer generally uses metal powder and ferrite as an absorbent, and also uses special materials such as nano composite metal powder and hollow microspheres, and in order to improve the wave absorbing performance, a multi-layer composite wave absorbing structure is mostly adopted; the coating process generally adopts spraying and electroplating. Although the wave-absorbing performance of the coating reaches the index requirement, the coating has the advantages of heavy weight, high material cost, complex process and no environmental protection, and is not suitable for large-scale production. Research shows that a better wave-absorbing coating system can achieve better wave-absorbing effect under the condition that the weight of the camouflage net is increased slightly.
Disclosure of Invention
Aiming at the content, the invention provides the wave-absorbing coating for the camouflage net and the preparation method thereof, and the water-based wave-absorbing coating for the relevant preparation process is coated on the base cloth, so that the camouflage net made of the wave-absorbing coating cloth has good broadband radar wave absorption and attenuation performance.
In order to achieve the purpose, the invention adopts the technical scheme that: the wave-absorbing coating for the camouflage net comprises the following components in parts by weight: 15-25 parts of distilled water, 65-75 parts of acrylic resin, 3 parts of granulating carbon black, 4-6 parts of carbon black, 1-3 parts of graphite, 1.5-2 parts of dispersant 750W, 0.1-0.3 part of defoamer, 0.4-0.5 part of hydroxyethyl cellulose and 1.5 parts of cross-linking agent.
The invention also discloses a double-layer structure camouflage net which is divided into an inner layer and an outer layer. The outer layer is cut into patterns by an arc-shaped cutter die, and the cut cloth pieces are turned up to form a scattering structure; the inner layer is cut by a circular cutter die to form air holes, and the inner layer and the outer layer are sewn to form the camouflage net with a double-layer structure.
The water-based wave-absorbing coating comprises the following components in parts by mass:
15-20 parts of distilled water
65-75 parts of acrylic resin
3 parts of granulated carbon black
4-6 parts of carbon black
1-3 parts of graphite
1.5-2 parts of dispersant 750W
0.1 to 0.3 portion of defoaming agent
0.4 to 0.5 part of hydroxyethyl cellulose
Crosslinking agent 1.5 parts
Further, the granulated carbon black is carbon black particles filled in microspheres, and the particle size is 0.5-0.8 mm.
Furthermore, the carbon black is extremely loose fine powder, has low apparent density which is a 50% compression product, and has the resistivity less than or equal to 3.5 omega ∙ m.
Furthermore, the main component of the graphite is micro-powder graphite which is in a milky state. Has the characteristics of electric conduction, lubrication, corrosion resistance, high temperature resistance and the like.
A wave-absorbing coating for a camouflage net and a preparation method of a double-layer camouflage net mainly comprise the following steps:
1) preparing the coating: weighing acrylic resin, distilled water, granulation carbon black, graphite, a dispersant 750W and a defoaming agent according to the composition proportion of claim 1, uniformly stirring, grinding, filtering by using a 120-300-mesh screen and discharging slurry; then adding hydroxyethyl cellulose and a cross-linking agent according to the formula, and uniformly stirring to prepare the water-based wave-absorbing coating;
2) preparing the wave-absorbing coated fabric: fixing the camouflage net base cloth on a bracket to be tightened, stacking wave-absorbing coating on one side of the base cloth, coating the coating on the other side by a scraper, placing the base cloth in an oven with the temperature of 150-160 ℃ for curing for 3min, taking out the base cloth, and testing the square resistance of the surface of the coating by a four-probe tester. And repeating the steps of blade coating and curing until the square resistance of the wave-absorbing coating reaches 270-320 omega.
3) Preparing a camouflage net: cutting the outer layer cloth into patterns, cutting holes in the inner layer cloth, stacking the inner layer cloth and the outer layer cloth, binding and sewing the inner layer cloth and the outer layer cloth by using a woven tape, turning and binding the arc petals on the outer layer cloth by using a plastic binding tape at the same interval, and sewing and fixing the binding tape on the inner layer cloth to prepare the double-layer camouflage net.
Compared with the prior art, the invention has the following beneficial effects: the water-based wave-absorbing coating adopts distilled water as a solvent and acrylic resin as a resin matrix, and the system is more environment-friendly compared with an organic solvent system; the carbon black and the graphite are used as wave absorbing agents, so that the weight is light and the cost is low; by matching with the synergistic effect of the dispersing agent, the defoaming agent and the cross-linking agent, the wave-absorbing coating has the characteristics of good wave-absorbing performance, wide absorption frequency band, good compatibility and the like; the adopted dry coating process is developed and matured, and is very suitable for large-scale production; is far superior to the conventional wave-absorbing coating. The prepared camouflage net with the double-layer structure has the advantages that the weight is increased less, and the wave-absorbing frequency band and the wave-absorbing performance of the camouflage net are greatly improved.
Drawings
Figure 1 is a typical reflectance curve for the camouflage net of example 1.
Figure 2 is a typical reflectance curve for the camouflage net of example 4.
Detailed Description
The invention is further described with reference to the following figures and examples:
example 1
A double-layer camouflage net is prepared by coating cloth covered with water-soluble wave-absorbing coating and is divided into an inner layer and an outer layer. The outer layer is cut into patterns by an arc-shaped cutter die, and the cut cloth pieces are turned up to form a scattering structure; the inner layer is cut by a circular cutter die to form air holes, and the inner layer and the outer layer are sewn to form the camouflage net with a double-layer structure.
The water-based wave-absorbing coating comprises the following components in parts by mass: 20 portions of distilled water
Acrylic resin 65 parts
3 parts of granulated carbon black
Carbon black 4 parts
3 parts of graphite
Dispersant 750W 1.5 parts
0.3 portion of defoaming agent
0.4 part of hydroxyethyl cellulose
Crosslinking agent 1.5 parts
Further, the granulated carbon black is carbon black particles filled in microspheres, and the particle size is 0.5-0.8 mm.
Furthermore, the carbon black is extremely loose fine powder, has low apparent density which is a 50% compression product, and has the resistivity less than or equal to 3.5 omega ∙ m.
Furthermore, the main component of the graphite is micro-powder graphite which is in a milky state. Has the characteristics of electric conduction, lubrication, corrosion resistance, high temperature resistance and the like.
The preparation method of the water-based wave-absorbing coating and the double-layer camouflage net mainly comprises the following steps:
1) raw material preparation and equipment preparation. Preparing required experimental raw materials such as acrylic resin, granulation carbon black, graphite, a dispersing agent, gas, a defoaming agent, distilled water, hydroxyethyl cellulose, a cross-linking agent, camouflage net base cloth and the like, and experimental equipment such as a basket type grinding machine, a balance and the like, wherein the grinding machine for preparing the coating is in a complete and clean state, and if necessary, a solvent such as distilled water is used for scrubbing; the balance is in good condition, periodically checked and in the period of validity.
2) And (4) preparing the coating. The acrylic resin, the distilled water, the granulated carbon black, the graphite powder, the dispersant 750W and the defoamer 815N are weighed in a container such as a beaker according to the formula, and the dosage error is not more than 0.5 percent. Stirring uniformly after adding each component, and finally grinding once by using a basket grinder, wherein the grinding speed is gradually increased from low to high. The grinding speed is 500r/min at first, the grinding time is 10min, then 1000r/min, the grinding time is 10min, and finally 2000r/min, the grinding time is 4 h. And then filtering the mixture by using a 120-300-mesh screen to obtain slurry. Hydroxyethyl cellulose and a cross-linking agent are added into a container according to the formula, and the error of the ingredients is not more than 0.5 percent. And (3) sanding for 30min by using a vertical sand mill, and preparing the waterborne wave-absorbing coating at the rotating speed (500 +/-100) rpm.
3) And (4) preparing the coated fabric. Fixing the camouflage net base cloth on a bracket to be tightened, stacking wave-absorbing coating on one side of the base cloth, coating the coating on the other side by a scraper, placing the base cloth in an oven with the temperature of 150-160 ℃ for curing for 3min, taking out the base cloth, and testing the square resistance of the surface of the coating by a four-probe tester. And repeating the steps of blade coating and curing until the square resistance of the surface of the wave-absorbing coating reaches 280 omega.
4) And (5) preparing a camouflage net. Cutting the outer layer cloth into patterns, cutting holes in the inner layer cloth, stacking the inner layer cloth and the outer layer cloth, binding and sewing the inner layer cloth and the outer layer cloth by using a woven tape, turning and binding the arc petals on the outer layer cloth by using a plastic binding tape at the same interval, and sewing and fixing the binding tape on the inner layer cloth to prepare the double-layer camouflage net.
The surface density of the prepared wave-absorbing coating is 25g/m2The square resistance was 280. omega. and the peel strength was 4.1N/cm. The radar wave absorption and attenuation performance curve of the manufactured double-layer camouflage net is shown in figure 1: at 3-18GHz, the radar reflectivity curves are all below-12 dB; in the wave bands of 4-10GHz and 12-17GHz, the radar reflectivity is below-17 dB, and the maximum resonance peak is (14.8-31.7 dB).
Because the density of the carbon black and the graphite is very low, the carbon black and the graphite occupy very large volume in the coating, the peeling strength of the coating is insufficient due to excessive addition, and the coating is easy to fall off, the proportion of the filler and the resin is tested at first, the absorbent is added to the maximum extent on the premise of ensuring the peeling strength of the coating, the dosage proportion of the three absorbents is screened, and the proper mass percentage is selected, so that the conductivity of the coating is optimal. The wave-absorbing coating has excellent wave-absorbing performance, wide absorption frequency band, light weight and good mechanical property, and is a formula with optimal comprehensive performance.
Example 2
The difference from the embodiment 1 is that the aqueous wave-absorbing coating consists of the following components:
15 portions of distilled water
Acrylic resin 75 parts
3 parts of granulated carbon black
3 parts of graphite
Dispersant 750W 1.5 parts
0.3 portion of defoaming agent
0.4 part of hydroxyethyl cellulose
Crosslinking agent 1.5 parts
The preparation method is the same as that of the embodiment 1, and when the square resistance of the coating reaches 280 omega, the surface density of the prepared wave-absorbing coating is 30g/m2The peel strength was 5.8N/cm.
In the embodiment 2, the proportion of the acrylic resin in the formula is increased, the mass proportion of the absorbent is relatively reduced, the weight of the prepared wave-absorbing coating which needs to reach the same wave-absorbing performance of the embodiment 1 is higher, and the formula has the advantages that the peeling strength of the coating is improved, and the wave-absorbing coating is suitable for a harsher environment.
Example 3
The difference from the embodiment 1 is that the water-soluble wave-absorbing coating consists of the following components:
20 portions of distilled water
Acrylic resin 65 parts
3 parts of granulated carbon black
6 portions of carbon black
1 part of graphite
Dispersant 750W 1.5 parts
0.3 portion of defoaming agent
0.4 part of hydroxyethyl cellulose
Crosslinking agent 1.5 parts
The preparation method is the same as example 1, and the wave absorbing material prepared by the methodThe coating has an areal density of 31g/m when the sheet resistance of the applied coating reaches 280 Ω2And the peel strength is 4N/cm.
In example 3, the mass percent of graphite in the absorbent is reduced, which results in the decrease of the conductive performance of the coating, and the prepared wave-absorbing coating needs to have higher weight to achieve the same wave-absorbing performance as that of example 1. The formula still has good peel strength, but has heavier quality, and has the advantage that the cost of the coating is reduced due to the reduction of the consumption of the graphite with high unit price.
Example 4
The difference from example 1 is that the coating sheet resistance was controlled to 320. omega. during coating.
The formula and the preparation method of the coating are the same as those of the example 1, when the square resistance of the prepared wave-absorbing coating is 320 omega, the surface density is 20g/m2The peel strength was 4.1N/cm. The radar wave absorption and attenuation performance of the manufactured double-layer camouflage net is shown in figure 2: : at 3-18GHz, the radar reflectivity curves are all below-10 dB; in the wave bands of 5-11GHz and 14-17GHz, the radar reflectivity is below-15 dB, and the maximum resonance peak is (15.8-18.7 dB). It can be seen that the whole wave absorbing performance of the camouflage net is weaker than that of the camouflage net in the embodiment 1 because the surface density of the coating is reduced. In practical application, the appropriate surface density of the coating can be selected according to specific weight and wave-absorbing performance requirements.
The above examples are only for illustrating the present invention and not for limiting the present invention, and it should be understood by those skilled in the art that any modification of the present invention, equivalent replacement of each raw material of the product of the present invention, addition of auxiliary components, selection of specific modes, etc. are all within the scope of the present invention, and the scope of the present invention should be defined by the claims.
Claims (6)
1. The water-based wave-absorbing coating for the camouflage net is characterized by comprising the following components in parts by mass: 15-25 parts of distilled water, 65-75 parts of acrylic resin, 3 parts of granulating carbon black, 4-6 parts of carbon black, 1-3 parts of graphite, 2.8-4 parts of dispersant 750W, 0.1-0.3 part of defoaming agent, 0.4-0.5 part of hydroxyethyl cellulose and 1.5 parts of cross-linking agent.
2. The water-based wave-absorbing coating for the camouflage net, according to claim 1, wherein the granulated carbon black is microsphere-loaded carbon black particles with the particle size of 0.5-0.8 mm.
3. The water-based wave-absorbing coating for the camouflage net, according to claim 1, is characterized in that the carbon black is extremely loose fine powder, has low apparent density which is a 50% compression product, and has the resistivity less than or equal to 3.5 Ω ∙ m.
4. The water-based wave-absorbing coating for camouflage net coating according to claim 1, wherein the main component of the graphite is micro-powder graphite which is in a milky state.
5. The utility model provides a bilayer structure camouflage net, includes base cloth and waterborne ripples coating of inhaling, its characterized in that, the material that camouflage net base cloth adopted is dacron oxford, and oxford surface scribbles waterborne ripples coating of inhaling, the component composition of waterborne ripples coating is: 15-25 parts of distilled water, 65-75 parts of acrylic resin, 3 parts of granulating carbon black, 4-6 parts of carbon black, 1-3 parts of graphite, 2.8-4 parts of dispersant 750W, 0.1-0.3 part of defoaming agent, 0.4-0.5 part of hydroxyethyl cellulose and 1.5 parts of cross-linking agent.
6. A preparation method of a double-layer structured camouflage net is characterized by comprising the following steps:
1) preparing the coating: weighing acrylic resin, distilled water, granulation carbon black, graphite, a dispersant 750W and a defoaming agent according to the composition proportion of claim 1, uniformly stirring, grinding, filtering by using a 120-300-mesh screen and discharging slurry; then adding hydroxyethyl cellulose and a cross-linking agent according to the formula, and uniformly stirring to prepare the water-based wave-absorbing coating;
2) preparing the wave-absorbing coated fabric: fixing the camouflage net base cloth on a bracket to be tightened, stacking wave-absorbing coating on one side of the base cloth, coating the coating on the other side by using a scraper, placing the base cloth into an oven with the temperature of 150-160 ℃ to be cured for 3min, taking out the base cloth, and testing the square resistance of the surface of the coating by using a four-probe tester; repeating the steps of blade coating and curing until the square resistance of the wave-absorbing coating reaches 270-320 omega;
3) preparing a camouflage net: cutting the outer layer cloth into patterns, cutting holes in the inner layer cloth, stacking the inner layer cloth and the outer layer cloth, binding and sewing the inner layer cloth and the outer layer cloth by using a woven tape, turning and binding the arc petals on the outer layer cloth by using a plastic binding tape at the same interval, and sewing and fixing the binding tape on the inner layer cloth to prepare the double-layer camouflage net.
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| CN202010250069.5A CN111234637A (en) | 2020-04-01 | 2020-04-01 | Water-based wave-absorbing coating for camouflage net, double-layer structured camouflage net prepared from water-based wave-absorbing coating and preparation method of water-based wave-absorbing coating |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111439953A (en) * | 2020-04-01 | 2020-07-24 | 南京南大波平电子信息有限公司 | Functional water-based wave-absorbing coating and preparation method thereof |
| CN113584899A (en) * | 2021-07-19 | 2021-11-02 | 安徽财纳伽善科技有限公司 | Superconducting shielding paint for preventing electronic wave camouflage net |
| CN113834383A (en) * | 2021-10-12 | 2021-12-24 | 南京南大波平电子信息有限公司 | Sandwich structure camouflage net and preparation method thereof |
| CN115966916A (en) * | 2022-12-30 | 2023-04-14 | 浙江盛发纺织印染有限公司 | Radar wave-absorbing material and production process thereof |
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| CN105348967A (en) * | 2015-12-04 | 2016-02-24 | 中国中化股份有限公司 | Carbon-serial water-based highly-conductive coating and application thereof |
| WO2018076260A1 (en) * | 2016-10-28 | 2018-05-03 | 冯李荣 | Multifunctional textile fabric |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111439953A (en) * | 2020-04-01 | 2020-07-24 | 南京南大波平电子信息有限公司 | Functional water-based wave-absorbing coating and preparation method thereof |
| CN113584899A (en) * | 2021-07-19 | 2021-11-02 | 安徽财纳伽善科技有限公司 | Superconducting shielding paint for preventing electronic wave camouflage net |
| CN113834383A (en) * | 2021-10-12 | 2021-12-24 | 南京南大波平电子信息有限公司 | Sandwich structure camouflage net and preparation method thereof |
| CN115966916A (en) * | 2022-12-30 | 2023-04-14 | 浙江盛发纺织印染有限公司 | Radar wave-absorbing material and production process thereof |
| CN115966916B (en) * | 2022-12-30 | 2023-08-11 | 浙江盛发纺织印染有限公司 | Radar wave-absorbing material and production process thereof |
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