An acid-dye-based green-plant-imitating camouflage fabric and a preparation method thereof

Abstract

The application discloses a kind of based on acid dye dyeing imitated green plant camouflage fabric and preparation method thereof, belong to textile printing and dyeing processing and visible light-near infrared camouflage material field.The application can be accurately simulated in the visible light-near infrared spectral range of 380-1200nm, reach the requirement of GJB 1411-2015 "ground-to-ground missile weapon equipment system camouflage" secondary optical camouflage and secondary spectral camouflage;Color can simulate the requirement of GBJ 1082A-2021 "camouflage paint film color camouflage net color", camouflage net color DG0850, MG1248, YG1550, and the camouflage fabric is good to the fastness of sunlight resistance, each item is good to the fastness of washing, and the wearing performance is good, reach the requirement of application in the field of camouflage.

Description

Technical Field

[0001] This invention belongs to the field of textile printing and dyeing processing and visible light-near infrared camouflage materials, specifically relating to a green plant camouflage fabric based on acid dye dyeing and its preparation method. Background Technology

[0002] Visible-near-infrared camouflage is a countermeasure against hyperspectral remote sensing imaging technology used in military reconnaissance. It targets the detection range of hyperspectral remote sensing imagers, employing camouflage in the 380-1200nm and 400-2500nm wavelength bands. Visible-near-infrared camouflage is particularly effective against UAVs equipped with hyperspectral remote sensing imagers operating in the widely used 380-1200nm range. This military camouflage can create deception, enhance the combat capabilities of weapons and equipment on the battlefield, reduce losses, and has practical significance for national defense security.

[0003] The development of woodland-type camouflage military equipment is an important topic in the goal of building a strong military. Woodland-type camouflage primarily uses four colors: green (dark green, medium green, and light green), brown, black, and gray. Among these, green is the most important and challenging color to camouflage.

[0004] Green is typically used to simulate vegetation, mimicking its color and spectrum. Green plant leaves exhibit distinct spectral characteristics in the 400-1200nm range. In the visible light band of 400-700nm, the pigments present in the leaves are mainly chlorophyll a and chlorophyll b, causing a strong absorption effect in the reflectance spectrum around 450nm and 680nm. This results in low reflectance in nearby wavelengths and forms a "green peak" around 550nm, which is the green color we see. In the 680-760nm spectral reflectance curve, the reflectance curve rises sharply, known as the "red edge." In the near-infrared region of 760-1200nm, except for weak water absorption peaks at 970nm and 1200nm, the reflectance presents a high plateau, known as the "near-infrared plateau."

[0005] Traditional green visible-near infrared (380-1200nm) camouflage mainly simulates the color of green vegetation. Camouflage coatings and camouflage nets developed based on the color characteristics of vegetation can only achieve the same color as vegetation or a relatively vague spectral feature simulation, and cannot achieve accurate "same spectrum", making them easily identified by hyperspectral imaging detection technology.

[0006] Acid dyes can mimic the spectral curves and characteristics of green plant leaves in the visible and near-infrared wavelengths (300-1200 nm). Compared to chlorophyll, they are chemically very stable, safe for human use, adaptable to textile processing systems, easy to produce, and highly industrially applicable. Therefore, developing a low-cost visible-near-infrared camouflage fabric that is compatible with textile dyeing and finishing systems, has good wearability, and exhibits a high degree of fit to visible-near-infrared spectral simulation using acid dyes is of practical significance for achieving a more practical, convenient, and reliable method in the field of visible-near-infrared camouflage processing. Summary of the Invention

[0007] Technical issues

[0008] Currently, camouflage fabrics with good camouflage performance against vegetation backgrounds are mostly prepared by printing or dyeing chlorophyll and chlorophyll derivatives, inorganic pigments, and disperse dyes. However, certain limitations still exist. Existing visible-near-infrared camouflage processing technologies for simulating greenery mostly fail to achieve "same color and spectrum," meaning they can only simulate the color of greenery or the visible-near-infrared camouflage spectrum, resulting in poor simulation accuracy or poor durability of the camouflage.

[0009] Technical content

[0010] Acid dyes can mimic the spectral curves and characteristics of green plant leaves in the visible and near-infrared wavelengths (300-1200 nm), and are chemically more stable than chlorophyll and its derivatives; they are safer for humans than inorganic pigments; and they offer a softer hand feel and better breathability than disperse pigment dyes. Acid dyes are adaptable to textile processing systems, easy to produce, and have strong industrial applicability. Therefore, developing a visible-near-infrared camouflage fabric with good visible-near-infrared spectral simulation using acid dyes is of practical significance.

[0011] The purpose of this invention is to provide a green plant camouflage fabric based on acid dyeing and its preparation method, which can accurately simulate the visible-near infrared spectrum range of 380-1200nm, meeting the requirements of secondary optical camouflage and secondary spectral camouflage in GJB 1411-2015 "Camouflage of Surface Missile Weapon Equipment Systems"; in terms of color, it can simulate the requirements of camouflage net colors DG0850, MG1248, and YG1550 in GBJ 1082A-2021 "Camouflage Coating Film Color and Camouflage Net Color".

[0012] This dyed fabric exhibits good lightfastness, good wash fastness, and good wearability. The preparation method is simple, fast, and efficient, making it suitable for continuous, mass production.

[0013] The technical solution adopted by the present invention to achieve the above objectives is as follows:

[0014] A plant camouflage dye made from acid dyes, the composition of which includes compound color, leveling agent, nonionic penetrant and solvent.

[0015] The composite color is prepared by mixing any two or more of the following: yellow E-4RL, blue E-BL, blue M-2RN, turquoise 8G, and bright green 6GL.

[0016] Furthermore, the composite color is prepared by mixing any three or more of the following: yellow E-4RL, blue E-BL, blue M-2RN, turquoise 8G, and bright green 6GL.

[0017] Furthermore, the color scheme is a combination of yellow E-4RL, blue E-BL, turquoise 8G, and bright green 6GL;

[0018] Alternatively, the color scheme could be a combination of yellow E-4RL, blue E-BL, and turquoise 8G;

[0019] Alternatively, the color combination is a mix of yellow E-4RL, blue E-BL, blue M-2RN, turquoise 8G, and bright green 6GL.

[0020] Furthermore, in the combination of yellow E-4RL, blue E-BL, turquoise 8G, and bright green 6GL, the mass ratio of yellow E-4RL: blue E-BL: turquoise 8G: bright green 6GL is 3:1~2:1~2:1~2.

[0021] Furthermore, in the combination of yellow E-4RL, blue E-BL, and turquoise 8G, the mass ratio of yellow E-4RL: blue E-BL: turquoise 8G is 8:3~4:2.5~3.

[0022] Furthermore, in the combination of yellow E-4RL, blue E-BL, blue M-2RN, turquoise 8G, and bright green 6GL, the mass ratio of yellow E-4RL: blue E-BL: blue M-2RN: turquoise 8G: bright green 6GL is 3:2~3:1~2:1~2:1~2.

[0023] Preferably, the composite color is a four-color scheme with a mass ratio of yellow E-4RL: blue E-BL: turquoise 8G: bright green 6GL of 3:1:1:1;

[0024] Alternatively, the color scheme is a three-color combination of yellow E-4RL: blue E-BL: turquoise 8G with a mass ratio of 8:3:2.5;

[0025] Alternatively, the color scheme is a five-color combination with a quality ratio of 3:2:1:1:1:yellow E-4RL:blue E-BL:blue M-2RN:turquoise 8G:bright green 6GL.

[0026] Furthermore, the total mass of the compound color mixture accounts for 0.1% to 0.3% of the mass fraction of the camouflage dye.

[0027] Furthermore, the leveling agent includes one or more of the following: high-temperature leveling agent DM-2119N, high-temperature leveling agent DM-2115N, high-temperature leveling agent DM-2110N, acidic leveling agent DM-2260, leveling agent DM-2209, leveling agent DM-2207H, and acidic leveling agent DM-2203H.

[0028] Furthermore, the concentration of leveling agent in camouflage dye is 1–3 g / L.

[0029] Furthermore, the nonionic penetrant includes one or more of the nonionic penetrants DM-1232 and DM-1221.

[0030] Furthermore, the concentration of nonionic penetrant in the camouflage dye is 1–3 g / L.

[0031] Furthermore, the solvent includes water.

[0032] Furthermore, the pH value of the camouflage dye is 4–6.

[0033] Furthermore, the pH value of the camouflage dye can be adjusted using one or more of the following: pH adjuster DA, pH shifter DM-2721G, acetic acid and sodium acetate, and citric acid.

[0034] The present invention relates to the application of the above-mentioned dyes in the fields of textiles, clothing, and camouflage materials.

[0035] This invention provides a light green dye solution that simulates YG1550, the dye being composed of a compound colorant, a leveling agent, a nonionic penetrant, and a solvent;

[0036] The compound color is a four-color blend with a mass ratio of Yellow E-4RL: Blue E-BL: Turquoise 8G: Bright Green 6GL of 3:1:1:1; the compound color accounts for 0.1 to 0.15% of the mass of the dye solution;

[0037] The leveling agent is DM-2110N; the concentration of the leveling agent in the camouflage dye is 1–3 g / L.

[0038] The nonionic penetrant is DM-1232; the concentration of the nonionic penetrant in the camouflage dye is 1–3 g / L.

[0039] The solvent is water.

[0040] This invention provides a medium green dye solution that simulates YG1550, wherein the dye is composed of a compound colorant, a leveling agent, a nonionic penetrant, and a solvent;

[0041] The compound color is a three-color mixture with a mass ratio of Yellow E-4RL: Blue E-BL: Turquoise Blue 8G of 8:3:2.5; the compound color accounts for 0.15 to 0.2% of the dye liquor mass;

[0042] The leveling agent is DM-2110N; the concentration of the leveling agent in the camouflage dye is 1–3 g / L.

[0043] The nonionic penetrant is DM-1232; the concentration of the nonionic penetrant in the camouflage dye is 1–3 g / L.

[0044] The solvent is water.

[0045] This invention provides a dark green dye solution that simulates DG0850, the dye being composed of a compound colorant, a leveling agent, a nonionic penetrant, and a solvent;

[0046] The compound color is a five-color blend with a mass ratio of Yellow E-4RL: Blue E-BL: Blue M-2RN: Turquoise 8G: Bright Green 6GL of 3:2:1:1:1; the compound color accounts for 0.15 to 0.2% of the dye liquor mass;

[0047] The leveling agent is DM-2110N; the concentration of the leveling agent in the camouflage dye is 1–3 g / L.

[0048] The nonionic penetrant is DM-1232; the concentration of the nonionic penetrant in the camouflage dye is 1–3 g / L.

[0049] The solvent is water.

[0050] The present invention relates to the application of the above-mentioned dyes in the fields of textiles, clothing, and camouflage materials.

[0051] This invention also provides a method for preparing a plant-like camouflage fabric, comprising the following steps:

[0052] The fabric is immersed in dye at a liquor ratio of 1:10 to 30. After dyeing, a new bath is used for color fixing at a liquor ratio of 1:40 to 60. After color fixing, the fabric sample is removed, rinsed, and dried to obtain a fabric that imitates green plants as camouflage.

[0053] In one embodiment of the present invention, the fabric includes nylon and its blends (nylon-cotton blend, nylon-viscose blend).

[0054] In one embodiment of the present invention, the dye used in the dyeing process is the above-prepared camouflage dye for imitating green plants.

[0055] As one embodiment of the present invention, the fixing agent used in the fixing process includes one or more of the following: fixing agent DM-2517, acidic fixing agent DM-2539G, acidic fixing agent DM-2534, acidic fixing agent DM-2532N, and fixing agent DM-2531N.

[0056] In one embodiment of the present invention, the content of the fixing agent during the color fixing process is 1-4% owf.

[0057] In one embodiment of the present invention, the heating process during dyeing is as follows: heating from room temperature to 50°C at a rate of 1.5°C / min, holding at that temperature for 20 min, then heating to 80°C at a rate of 1°C / min, holding at that temperature for 40 min, and then cooling down to 50°C at a rate of 2°C / min.

[0058] In one embodiment of the present invention, the heating process in color fixing is to heat from room temperature to 80°C at a rate of 2°C / min, hold at that temperature for 20 min, and then cool down to 50°C at a rate of 2°C / min.

[0059] The present invention provides a green plant camouflage fabric prepared according to the above method.

[0060] The application of the green plant camouflage fabric provided by this invention in the fields of textiles, clothing, and camouflage materials.

[0061] Beneficial effects:

[0062] This invention can accurately simulate the visible-near-infrared spectral range of 380-1200nm, meeting the requirements of Level 2 optical camouflage and Level 2 spectral camouflage in GJB 1411-2015 "Camouflage of Surface-to-Surface Missile Weapon Equipment Systems". In terms of color, it can simulate the requirements of camouflage net colors DG0850, MG1248, and YG1550 in GBJ 1082A-2021 "Camouflage Coating Film Color and Camouflage Net Color". Moreover, the camouflage fabric has good light fastness, good wash fastness, and good wearability. The preparation method is simple, fast, and efficient, and is suitable for continuous and mass production. Attached Figure Description

[0063] Figure 1 The spectral reflectance curves of the embodiment are compared with those of the standard spectral channel.

[0064] Figure 2 Comparative spectral reflectance curves and standard spectral channels.

[0065] Figure 3 Spectral reflectance curve of acid yellow dye.

[0066] Figure 4 Spectral reflectance curve of acid blue dye.

[0067] Figure 5 The dyeing and fixing process is as follows: dyeing and fixing process flow. Detailed Implementation

[0068] Source of raw materials

[0069] The fabrics used in the examples and comparative examples were all bio-based nylon 56 fabrics sourced from Huafang Co., Ltd., the dyes from Shanghai Yayun Textile Chemical Co., Ltd. and Hangzhou Xiasha Hengsheng Chemical Co., Ltd., and the auxiliaries from Wuxi Huishan Demei Chemical Co., Ltd.

[0070] Testing process

[0071] The color fastness test method is as follows:

[0072] The light fastness of dyed fabric samples was tested according to the standard GB / T 8427-2019 "Textiles - Tests for color fastness - Color fastness to artificial light: Xenon arc", and compared with the standard blue wool.

[0073] The color fastness to soap washing of the samples was tested in accordance with the standard GB / T 3921-2008 "Textiles - Tests for color fastness - Color fastness to soap washing". The test conditions were: 30℃*30min, 5g / l standard soap flakes.

[0074] The alkaline perspiration fastness of the samples was tested according to the standard GB / T 3922-2013 "Textiles - Tests for color fastness - Color fastness to perspiration". The test conditions were: temperature 37±5℃, time 4h, and alkaline condition with pH value of 8.0±0.2 after adjustment with NaOH.

[0075] The color fastness to rubbing was tested in accordance with the standard GB / T 3920-2008 "Textiles - Tests for color fastness to rubbing". The standard rubbing sample was standard cotton fabric, and the number of rubbing cycles was 20. The wet rubbing was performed by immersion in deionized water and then testing after pressing.

[0076] The color fastness grade of the samples was evaluated in accordance with the standard GB / T 250-2008 "Textiles - Tests for color fastness - Assessment of color change using gray scale".

[0077] The color fastness grade of the samples was evaluated in accordance with the standard GB / T 251-2008 "Textiles - Tests for color fastness - Gray scale for assessment of staining".

[0078] The spectral simulation method is as follows:

[0079] Spectral simulation calculations were performed with reference to standard GJB 1411A-2015, Part 5.3.4: Requirements for Hyperspectral Secondary Camouflage Indicators (imitating green vegetation);

[0080] (1) Spectral reflectance curve test: The visible-near-infrared reflectance spectrum curve of the fabric was tested using a Lambda 950 UV-Vis-NIR spectrophotometer. The test conditions were: 400-1200nm, 5nm, R%.

[0081] (2) Calculate the spectral distance d. The standard requires the spectral distance to be less than 5.

[0082] (3) Calculate the spectral correlation coefficient r. The closer the correlation coefficient is to 1, the closer the curves are as a whole.

[0083] (4) Calculate the spectral angle θ. The standard requires the spectral angle to be less than 0.13 rad.

[0084] (5) The reference is the standard vegetation spectral reflectance curve.

[0085] The color simulation method is as follows:

[0086] The L*a*b* values ​​and color difference ΔE of the fabric were tested using a DC850 computer colorimeter. The measurement conditions were: 380-750nm, D65 light source, 2° field of view. a) Refer to standard GJB 1411A-2015, Part 5.3.1: Optical camouflage index requirements; b) Refer to standard GJB 798-2020 camouflage coating film color (camouflage net color, Table 1. Colorimetric data and near-infrared luminance factor of standard green). A color difference ΔE less than 3 indicates that the requirements are met.

[0087] Example 1

[0088] A compound acidic light green dye bath is prepared, consisting of four colors in a mass ratio of Yellow E-4RL: Blue E-BL: Turquoise 8G: Brilliant Green 6GL of 3:1:1:1, with each component accounting for 0.02% of the total mass of the dye bath. The pH value of the dye bath is 4-5. The dye bath contains 2 g / L of leveling agent DM-2110N and 1.0 g / L of nonionic penetrant DM-1232. The total volume of the dye bath is calculated based on the fabric and the liquor ratio.

[0089] Fabric dyeing: The dyeing method is immersion dyeing, performed using an LA900 infrared dyeing machine. The fabric weight is 2g, and the liquor ratio is 1:20. After dyeing, a new liquor bath is used for color fixing, with a liquor ratio of 1:50. The color fixing agent is DM-2537, used at a dosage of 10g / L. The dyeing and color fixing process is as follows. Figure 5 As shown. After color fixing, the fabric sample was removed, rinsed, and dried to obtain a light green fabric.

[0090] Example 2

[0091] A compound acidic medium-green dye liquor is prepared, consisting of a three-color blend of yellow E-4RL, blue E-BL, and turquoise 8G in a mass ratio of 8:3:2.5, with each component accounting for 0.02% of the total mass of the dye liquor. The pH value of the dye liquor is 4-5. The leveling agent DM-2110N in the dye liquor contains 2 g / L, and the nonionic penetrant DM-1232 in the dye liquor contains 1.0 g / L. The total volume of the dye liquor is calculated based on the fabric and the liquor ratio.

[0092] Fabric dyeing: The dyeing method is immersion dyeing, performed using an LA900 infrared dyeing machine. The fabric weight is 2g, and the liquor ratio is 1:20. After dyeing, a new liquor bath is used for color fixing, with a liquor ratio of 1:50. The color fixing agent is DM-2537, used at a dosage of 10g / L. The dyeing and color fixing process is as follows. Figure 5 As shown. After color fixing, the fabric sample was removed, rinsed, and dried to obtain a medium green fabric.

[0093] Example 3

[0094] The five-color blend of yellow (E-4RL), blue (E-BL), blue (M-2RN), turquoise (8G), and bright green (6GL) in the compound acidic dark green dye bath has a mass ratio of 3:2:1:1:1, with each component accounting for 0.02% of the total mass of the dye bath. The pH value of the dye bath is 4-5. The leveling agent DM-2110N in the dye bath contains 2 g / L, and the nonionic penetrant DM-1232 in the dye bath contains 1.0 g / L. The total volume of the dye bath is calculated based on the fabric and the liquor ratio.

[0095] Fabric dyeing: The dyeing method is immersion dyeing, performed using an LA900 infrared dyeing machine. The fabric weight is 2g, and the liquor ratio is 1:20. After dyeing, a new liquor bath is used for color fixing, with a liquor ratio of 1:50. The color fixing agent is DM-2537, used at a dosage of 10g / L. The dyeing and color fixing process is as follows. Figure 5 As shown. After color fixing, the fabric sample was removed, rinsed, and dried to obtain a dark green fabric.

[0096] Comparative Example 1

[0097] The acid dye bath contains 0.1% acid brilliant green 6GL by mass for single-color dyeing (different concentrations of acid brilliant green 6GL only affect the reflectance value, not the peak position, i.e., the positions of the "green peak" and "red edge" do not change, so a medium-dark color with a mass percentage of 0.1% is selected as a representative comparative example); the pH value of the dye bath is 4-5; the leveling agent DM-2110N content in the dye bath is 2 g / L; the nonionic penetrant DM-1232 content in the dye bath is 1.0 g / L; the total volume of the dye bath is calculated based on the fabric and the bath ratio.

[0098] Fabric dyeing: The dyeing method is immersion dyeing, which is carried out using an LA900 infrared dyeing machine. The fabric weight is 2g, the liquor ratio is 1:20, and after dyeing, a new liquor bath is used for color fixing at a liquor ratio of 1:50. The color fixing agent is DM-2537, used at a dosage of 10g / L. The dyeing and color fixing process is as follows: Figure 5 As shown. After color fixing, the fabric sample was removed, rinsed, and dried to obtain green fabric.

[0099] Comparative Example 2

[0100] The compound acid green dye bath contains a 1:1 ratio of yellow E-4RL to blue E-BL, with each component accounting for 0.025% of the total dye bath. The pH of the dye bath is 4-5. The leveling agent DM-2110N in the dye bath contains 2 g / L. The nonionic penetrant DM-1232 in the dye bath contains 1.0 g / L. The total volume of the dye bath is calculated based on the fabric and the liquor ratio.

[0101] Fabric dyeing: The dyeing method is immersion dyeing, performed using an LA900 infrared dyeing machine. The fabric weight is 2g, and the liquor ratio is 1:20. After dyeing, a new liquor bath is used for color fixing, with a liquor ratio of 1:50. The color fixing agent is DM-2537, used at a dosage of 10g / L. The dyeing and color fixing process is as follows. Figure 5 As shown. After color fixing, the fabric sample was removed, rinsed, and dried to obtain green fabric.

[0102] Comparative Example 3

[0103] The compound acid green dye bath contains a 1:1 ratio of yellow E-4RL to turquoise 8G, representing a two-color blend. Each component of the yellow E-4RL represents 0.025% of the dye bath. The pH of the dye bath is 4-5. The leveling agent DM-2110N in the dye bath contains 2 g / L. The nonionic penetrant DM-1232 in the dye bath contains 1.0 g / L. The total volume of the dye bath is calculated based on the fabric and the liquor ratio.

[0104] Fabric dyeing: The dyeing method is immersion dyeing, performed using an LA900 infrared dyeing machine. The fabric weight is 2g, and the liquor ratio is 1:20. After dyeing, a new liquor bath is used for color fixing, with a liquor ratio of 1:50. The color fixing agent is DM-2537, used at a dosage of 10g / L. The dyeing and color fixing process is as follows. Figure 5 As shown. After color fixing, the fabric sample was removed, rinsed, and dried to obtain green fabric.

[0105] Comparative Example 4

[0106] The compound acid green dye bath contains a two-color blend of yellow N-RX and bright green 6GL with a mass ratio of 1.5:1, with each component accounting for 0.05% of the total mass of the dye bath. The pH value of the dye bath is 4-5. The leveling agent DM-2110N in the dye bath contains 2 g / L, and the nonionic penetrant DM-1232 in the dye bath contains 1.0 g / L. The total volume of the dye bath is calculated based on the fabric and the liquor ratio.

[0107] Fabric dyeing: The dyeing method is immersion dyeing, performed using an LA900 infrared dyeing machine. The fabric weight is 2g, and the liquor ratio is 1:20. After dyeing, a new liquor bath is used for color fixing, with a liquor ratio of 1:50. The color fixing agent is DM-2537, used at a dosage of 10g / L. The dyeing and color fixing process is as follows. Figure 5 As shown. After color fixing, the fabric sample was removed, rinsed, and dried to obtain green fabric.

[0108] Comparative Example 5

[0109] The compound acid green dye bath contains a two-color blend with a yellow E-4RL: blue E-BL: turquoise 8G mass ratio of 1:1:1, with each component accounting for 0.05% of the total mass of the dye bath. The pH value of the dye bath is 4-5. The leveling agent DM-2110N content in the dye bath is 2 g / L. The nonionic penetrant DM-1232 content in the dye bath is 1.0 g / L. The total volume of the dye bath is calculated based on the fabric and the liquor ratio.

[0110] Fabric dyeing: The dyeing method is immersion dyeing, performed using an LA900 infrared dyeing machine. The fabric weight is 2g, and the liquor ratio is 1:20. After dyeing, a new liquor bath is used for color fixing, with a liquor ratio of 1:50. The color fixing agent is DM-2537, used at a dosage of 10g / L. The dyeing and color fixing process is as follows. Figure 5 As shown. After color fixing, the fabric sample was removed, rinsed, and dried to obtain green fabric.

[0111] Table 1 Spectral simulation results

[0112]

[0113] Table 2 Color Simulation Results

[0114]

[0115] Table 3. Results of Colorfastness Test

[0116]

[0117]

[0118] Spectral distance (d) describes the distance between the sample spectrum and the reference standard spectrum, indicating the proximity of two points in the spectrum and characterizing the similarity of the spectra. Spectral angle (θ) describes the spectral shape similarity between the sample and the reference standard spectrum, expressing the local geometric similarity of the spectra. The smaller the vector angle, the higher the geometric similarity. The p-correlation coefficient (r) describes the overall correlation between the sample spectrum and the reference standard spectrum; the closer the value is to 1, the greater the correlation. GJB1411-2015 "Camouflage of Surface-to-Surface Missile Weapon Equipment Systems" requires secondary optical camouflage and secondary spectral camouflage: spectral distance less than 5; spectral angle less than 0.13 rad; p-correlation coefficient closer to 1 is better. GBJ 1082A-2021 "Camouflage Coating Film Colors and Camouflage Net Colors" requires camouflage net color: color difference ΔE less than 3.

[0119] Comparing the comparative examples and the embodiments, as shown in Table 1, embodiments 1, 2, and 3 all meet the requirements of spectral distance less than 5, spectral angle less than 0.13 rad, and spectral P-correlation coefficient greater than 0.985, close to 1, satisfying the requirements of Level II optical camouflage and Level II spectral camouflage in the visible-near-infrared spectral range of 380-1200 nm according to GJB 1411-2015 "Camouflage of Surface-to-Surface Missile Weapon Equipment Systems". As shown in Table 2, embodiments 1, 2, and 3 can simulate the colors of camouflage nets YG1550, MG1248, and DG0850 in GBJ 1082A-2021 "Camouflage Coating Film Colors and Camouflage Net Colors", achieving a color difference ΔE of less than 3. The embodiments show good fastness in all aspects, as shown in Table 3. Comparative examples 1, 2, 3, 4, and 5 do not meet the spectral simulation requirements, and their colors also differ significantly from the camouflage net colors. In summary, embodiments 1, 2, and 3 can meet the requirements of the camouflage standards.

[0120] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the claims.

Claims

1. A camouflage dye for imitating green plants, prepared from acidic dyes, characterized in that, The composition of camouflage dyes includes compound colorants, leveling agents, nonionic penetrants, and solvents; The total mass fraction of the compound color mixture in the camouflage dye is 0.1% to 0.3%; The concentration of leveling agent in camouflage dye is 1~3 g / L; The concentration of nonionic penetrant in camouflage dyes is 1~3 g / L; The color combination is a combination of yellow E-4RL, blue E-BL, turquoise 8G, and bright green 6GL, with the mass ratio of yellow E-4RL: blue E-BL: turquoise 8G: bright green 6GL being 3:1~2:1~2:1~2; Alternatively, the color combination is a combination of yellow E-4RL, blue E-BL, and turquoise 8G, where the mass ratio of yellow E-4RL: blue E-BL: turquoise 8G is 8:3~4:2.5~3; Alternatively, the color combination is a combination of yellow E-4RL, blue E-BL, blue M-2RN, turquoise 8G, and bright green 6GL, where the quality ratio of yellow E-4RL: blue E-BL: blue M-2RN: turquoise 8G: bright green 6GL is 3:2~3:1~2:1~2:1~2.

2. The camouflage dye for imitating green plants according to claim 1, characterized in that, The leveling agent includes one or more of the following: high temperature leveling agent DM-2119N, high temperature leveling agent DM-2115N, high temperature leveling agent DM-2110N, acidic leveling agent DM-2260, leveling agent DM-2209, leveling agent DM-2207H, and acidic leveling agent DM-2203H.

3. The camouflage dye for imitating green plants according to claim 1, characterized in that, Nonionic penetrants include one or more of nonionic penetrants DM-1232 and DM-1221.

4. The application of the plant-like camouflage dye according to any one of claims 1 to 3 in the fields of textiles, clothing, and camouflage materials.

5. A method for preparing a camouflage fabric resembling green plants, characterized in that, Includes the following steps: The fabric is immersed in dye, and the dye used in the immersion is the plant camouflage dye described in claim 4, with a liquor ratio of 1:10~30. After dyeing, a new bath is used for color fixing, with a liquor ratio of 1:40~60. After color fixing, the fabric sample is taken out, rinsed and dried to obtain plant camouflage fabric.

6. The camouflage fabric made by the method described in claim 5.

7. The application of the plant-like camouflage fabric as described in claim 6 in the fields of textiles, clothing, and camouflage materials.

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