A green hyperspectral camouflage inorganic pigment and preparation method thereof

Abstract

The present invention relates to the technical field of inorganic metal oxide pigments, and specifically discloses a green hyperspectral camouflage inorganic pigment and a preparation method thereof. The green hyperspectral camouflage inorganic pigment comprises micron Cr2O3 10%-30%, micron Co2O3 30%-50%, nano ZnO 6%-15%, nano Al2O3 5%-15%, nano SiO2 3%-10%, nano SrO 3%-10%, nano BaO 3%-5% and nano Y2O3 5%-10%. The green hyperspectral camouflage inorganic pigment provided by the present invention has a spectral reflectivity of 59% at 1200nm; and a spectral reflectivity of 38% at 1400nm; the K value of the prepared green hyperspectral camouflage inorganic pigment is above 10, and the reflectivity of the green hyperspectral camouflage inorganic pigment is similar to that of green plants, and can be integrated with the natural background to achieve a camouflage effect.

Description

Technical Field

[0001] The invention relates to the technical field of inorganic metal oxide pigments, and in particular to a green high-spectrum camouflage inorganic pigment and a preparation method thereof. Background Art

[0002] Inorganic oxide pigments are widely used in coatings, inks, ceramics and other national economic fields due to their good temperature and chemical stability. Green inorganic pigments, as the core pigments of reflective thermal insulation coatings, are key materials for improving the matching characteristics of stealth coatings with the natural background of ground equipment, and are also the key to improving the performance of stealth coatings.

[0003] The most widely used green inorganic pigment is chromium oxide green pigment. Among them, chromium trioxide has the advantages of high tinting strength, high thermal stability, and good corrosion resistance. It has long been widely used as an important inorganic green pigment. However, chromium oxide green pigment has adverse effects on the environment, and its reflectivity in the near-infrared region is low, which is somewhat different from the spectrum of green plants. In recent years, there have been endless studies on how to improve chromium oxide green, but most of the studies mainly use the method of doping metal elements to control the spectrum to change the spectral characteristics of chromium oxide green pigment. However, the prepared green inorganic pigment is difficult to meet the needs of hyperspectral / hyperspectral detection. Therefore, it is of great significance to study a green hyperspectral inorganic pigment with high spectral reflectivity and improved integration with natural vegetation background. Summary of the invention

[0004] In view of the current situation that the existing green pigment has low hyperspectral reflectivity and poor integration with the natural vegetation background, the present invention provides a green hyperspectral camouflage inorganic pigment and a preparation method thereof.

[0005] In order to solve the above technical problems, the technical solution provided by the present invention is:

[0006] A green high-spectrum camouflage inorganic pigment comprises the following components in mass percentage: micron Cr2O3 10%-30%, micron Co2O3 30%-50%, nano ZnO 6%-15%, nano Al2O3 5%-15%, nano SiO2 3%-10%, nano SrO 3%-10%, nano BaO 3%-5% and nano Y2O3 5%-10%.

[0007] Compared with the prior art, the green hyperspectral camouflage inorganic pigment provided by the present invention, wherein micron Cr2O3 as a green metal oxide, after high temperature calcination, has a dense crystal structure; by adding a specific content of micron Co2O3, it can react with micron Cr2O3 to form a CoCr2O4 crystal structure; further, by adding a certain amount of nano ZnO, the Zn in the nano ZnO 2+ The radius is larger than Co 2+ Large, Zn 2+ It can be added into the CoCr2O4 crystal form, which not only makes the final color appear green, but also improves the far-red light reflectivity of the pigment; Nano-SrO and Nano-Y2O3 have a wider bandgap, a smaller resistivity and a higher catalytic activity. By adding a specific content of nano-SrO and nano-Y2O3, the coordination environment of the coloring ions presenting green is regulated, and the far-red light reflectivity of the green hyperspectral camouflage inorganic pigment is further improved; Cr-Co-Zn-Al-Si-Sr-Ba-Y is used as the main raw material of the green inorganic pigment, and by limiting the percentage of each component, it is beneficial to achieve uniform dispersion and particle coating of the particles, so that the crystal form of the microscopic morphology reaches the spinel crystal form, and has a reflectivity similar to that of green vegetation under far-red light conditions, and the k value is increased to more than 10, achieving a camouflage effect.

[0008] Preferably, the particle size of the micron Cr2O3 is 20μm-50μm.

[0009] Preferably, the particle size of the micron Co2O3 is 20μm-50μm.

[0010] Preferably, the particle size of the nano ZnO is 30nm-100nm.

[0011] Preferably, the particle size of the nano-Al2O3 is 30nm-200nm.

[0012] Preferably, the particle size of the nano-SiO2 is 50nm-200nm.

[0013] Preferably, the particle size of the nano-SrO is 30nm-50nm.

[0014] Preferably, the particle size of the nano-BaO is 50nm-200nm.

[0015] Preferably, the particle size of the nano Y2O3 is 100nm-200nm.

[0016] By optimizing the particle size of each component, it is helpful to increase the K value of the green high-spectrum camouflage inorganic pigment to more than 10.

[0017] The present invention also provides a method for preparing the green hyperspectral camouflage inorganic pigment, comprising the following steps:

[0018] Step a, weighing each component according to the designed ratio, wet-milling the weighed nano-Cr2O3, nano-Co2O3, nano-ZnO, nano-Al2O3, nano-SiO2, nano-SrO, nano-BaO and nano-Y2O3 at a speed of 2500r / min-3500r / min for 2h-4h to obtain a mixed slurry;

[0019] Step b, vacuum drying the mixed slurry until the moisture content is ≤0.1% to obtain a dry material;

[0020] Step c, dry-grinding the dried material at a rate of 800 r / min-1200 r / min for 1.5 h-2.5 h to obtain a ground material;

[0021] Step d, heating the ground material to 1250° C.-1400° C., keeping the temperature for 3.5 h-4.5 h, and cooling to obtain a primary green hyperspectral camouflage inorganic pigment;

[0022] Step e: dry-grind the primary green hyperspectral camouflage inorganic pigment at a rotation speed of 1500 r / min-2000 r / min for 25 min-30 min, and sieve to obtain the green hyperspectral camouflage inorganic pigment.

[0023] Preferably, in step a, the conditions for wet ball milling are: the particle size of the grinding balls is 2 cm, the ball milling medium is anhydrous ethanol, the material-ball ratio is 1:7-8, and the mass ratio of solid material to anhydrous ethanol is 1:1.5-2.

[0024] Preferably, in step b, the vacuum drying temperature is 70°C-80°C

[0025] Preferably, in step c, the dry grinding conditions are: the material-ball ratio is 1:20-25, and the grinding balls are mixed steel balls of 5 mm grinding balls and 8 mm grinding balls with a mass ratio of 2-3:1.

[0026] Preferably, in step d, the heating temperature is 1300° C. and the insulation time is 4 h.

[0027] The preferred heating temperature can ensure that the particle morphology of the pigment is evenly distributed without agglomeration and agglomeration.

[0028] Preferably, in step e, the dry grinding conditions are: the material-ball ratio is 1:10-15, and the grinding balls are mixed steel balls of 5 mm grinding balls and 8 mm grinding balls with a mass ratio of 2-3:1.

[0029] Preferably, in step e, the sieving condition is: passing through a 400-mesh sieve.

[0030] By passing through a 400-mesh sieve, a specific particle size of the green inorganic pigment is obtained. The specific particle size can improve the light reflection characteristics of the pigment in far-infrared light, making it close to the reflectivity of green plants, achieving integration with the natural background and achieving a camouflage effect.

[0031] The preparation method of the green hyperspectral camouflage inorganic pigment provided by the present invention makes the reflectivity of the green hyperspectral camouflage inorganic pigment close to the reflectivity of green plants, and can be integrated with the natural background to achieve a camouflage effect; the process flow and process are simple, and the quality control of the finished product is more stable. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0033] Example 1

[0034] The green hyperspectral camouflage inorganic pigment provided by the embodiment of the present invention comprises the following components by mass: 20% micron Cr2O3, 30% micron Co2O3, 6% nano ZnO, 10% nano Al2O3, 10% nano SiO2, 10% nano SrO, 5% nano BaO and 9% nano Y2O3;

[0035] Among them, the particle size of micron Cr2O3 is 20μm; the particle size of micron Co2O3 is 20μm; the particle size of nano ZnO is 100nm; the particle size of nano Al2O3 is 200nm; the particle size of nano SiO2 is 200nm; the particle size of nano SrO is 30nm; the particle size of nano BaO is 50nm; the particle size of nano Y2O3 is 200nm;

[0036] The preparation method of the green hyperspectral camouflage inorganic pigment comprises the following steps:

[0037] Step a, weighing each component according to the designed ratio, adding micron Cr2O3, micron Co2O3, nano ZnO, nano Al2O3, nano SiO2, nano SrO, nano BaO and nano Y2O3 into a ball mill, using anhydrous ethanol as the ball milling medium, controlling the material-ball ratio to be 1:8, and the mass ratio of the solid material to anhydrous ethanol to be 1:2, adding 2 mm grinding balls and ethanol, and performing wet ball milling at a speed of 2500 r / min for 4 hours to obtain a mixed slurry;

[0038] Step b, vacuum filtering the mixed slurry, and drying at 80° C. until the moisture content is ≤ 0.1% to obtain a dry material;

[0039] Step c, adding the dried material into the ball mill of the planetary ball mill, controlling the material-ball ratio to be 1:25, using mixed steel balls of 5 mm grinding balls and 8 mm grinding balls with a mass ratio of 2:1, and dry grinding at a rate of 1200 r / min for 2.5 h to obtain the ground material;

[0040] Step d, heating the ground material to 1300° C., keeping the temperature for 4 hours, and cooling to room temperature to obtain a primary green hyperspectral camouflage inorganic pigment;

[0041] Step e, adding the primary green hyperspectral camouflaged inorganic pigment into the ball mill of the planetary ball mill, controlling the material-ball ratio to be 1:15, using a mixed steel ball of 5mm grinding balls and 8mm grinding balls with a mass ratio of 2:1, dry grinding at a speed of 1500r / min for 30min, and passing through a 400-mesh sieve to obtain the green hyperspectral camouflaged inorganic pigment.

[0042] Example 2

[0043] The green hyperspectral camouflage inorganic pigment provided by the embodiment of the present invention comprises the following components by mass: 30% micron Cr2O3, 30% micron Co2O3, 15% nano ZnO, 5% nano Al2O3, 3% nano SiO2, 3% nano SrO, 5% nano BaO and 9% nano Y2O3;

[0044] Among them, the particle size of micron Cr2O3 is 50μm; the particle size of micron Co2O3 is 50μm; the particle size of nano ZnO is 30nm; the particle size of nano Al2O3 is 30nm; the particle size of nano SiO2 is 50nm; the particle size of nano SrO is 50nm; the particle size of nano BaO is 200nm; the particle size of nano Y2O3 is 100nm;

[0045] The preparation method of the green hyperspectral camouflage inorganic pigment comprises the following steps:

[0046] Step a, weighing each component according to the designed ratio, adding micron Cr2O3, micron Co2O3, nano ZnO, nano Al2O3, nano SiO2, nano SrO, nano BaO and nano Y2O3 into a ball mill, using anhydrous ethanol as the ball milling medium, controlling the material-ball ratio to be 1:7, and the mass ratio of the solid material to anhydrous ethanol to be 1:1.5, adding 2 mm grinding balls and ethanol, and performing wet ball milling at a speed of 2500 r / min for 4 hours to obtain a mixed slurry;

[0047] Step b, vacuum filtering the mixed slurry, and drying at 70° C. until the moisture content is ≤ 0.1% to obtain a dry material;

[0048] Step c, adding the dried material into the ball mill of the planetary ball mill, controlling the material-ball ratio to be 1:20, using mixed steel balls of 5 mm grinding balls and 8 mm grinding balls with a mass ratio of 3:1, and dry grinding at a rate of 800 r / min for 1.5 h to obtain the ground material;

[0049] Step d, heating the ground material to 1250° C., keeping the temperature for 3.5 hours, and cooling to room temperature to obtain a primary green hyperspectral camouflage inorganic pigment;

[0050] Step e, adding the primary green hyperspectral camouflaged inorganic pigment into the ball mill of the planetary ball mill, controlling the material-ball ratio to be 1:10, using mixed steel balls of 5mm grinding balls and 8mm grinding balls with a mass ratio of 3:1, dry grinding at a speed of 2000r / min for 25min, and passing through a 400-mesh sieve to obtain the green hyperspectral camouflaged inorganic pigment.

[0051] Example 3

[0052] The green hyperspectral camouflage inorganic pigment provided by the embodiment of the present invention comprises the following components by mass: 23% micron Cr2O3, 38% micron Co2O3, 12% nano ZnO, 7% nano Al2O3, 4% nano SiO2, 6% nano SrO, 4% nano BaO and 6% nano Y2O3;

[0053] Among them, the particle size of micron Cr2O3 is 30μm; the particle size of micron Co2O3 is 30μm; the particle size of nano ZnO is 60nm; the particle size of nano Al2O3 is 100nm; the particle size of nano SiO2 is 100nm; the particle size of nano SrO is 40nm; the particle size of nano BaO is 100nm; the particle size of nano Y2O3 is 150nm;

[0054] The preparation method of the green hyperspectral camouflage inorganic pigment comprises the following steps:

[0055] Step a, weighing each component according to the designed ratio, adding micron Cr2O3, micron Co2O3, nano ZnO, nano Al2O3, nano SiO2, nano SrO, nano BaO and nano Y2O3 into a ball mill, using ethanol as the ball milling medium, controlling the material-ball ratio to be 1:7.5, and the mass ratio of the solid material to anhydrous ethanol to be 1:1.7, adding 2 mm grinding balls and ethanol, and performing wet ball milling at a speed of 3000 r / min for 3 h to obtain a mixed slurry;

[0056] Step b, vacuum filtering the mixed slurry, and drying at 75° C. until the moisture content is ≤ 0.1%, to obtain a dry material;

[0057] Step c, adding the dried material into the ball mill of the planetary ball mill, controlling the material-ball ratio to be 1:22, using mixed steel balls of 5 mm grinding balls and 8 mm grinding balls with a mass ratio of 3:1, and dry grinding at a rate of 1000 r / min for 2 h to obtain the ground material;

[0058] Step d, heating the ground material to 1400° C., keeping the temperature for 4.5 hours, and cooling to room temperature to obtain a primary green hyperspectral camouflage inorganic pigment;

[0059] Step e, adding the primary green hyperspectral camouflaged inorganic pigment into the ball mill of the planetary ball mill, controlling the material-ball ratio to be 1:12, using mixed steel balls of 5 mm grinding balls and 8 mm grinding balls with a mass ratio of 3:1, dry grinding at a speed of 1700 r / min for 27 min, and passing through a 400 mesh sieve to obtain the green hyperspectral camouflaged inorganic pigment.

[0060] Comparative Example 1

[0061] This comparative example provides an inorganic pigment, and its preparation method is exactly the same as that of Example 1, except that the nano-SrO in Example 1 is replaced by nano-TiO2; the other components are the same as those in Example 1;

[0062] The above inorganic pigment was prepared in the same manner as in Example 1.

[0063] Comparative Example 2

[0064] This comparative example provides an inorganic pigment, and its preparation method is exactly the same as that of Example 1, except that the nano-BaO in Example 1 is replaced by nano-MnO2;

[0065] The other components are the same as those in Example 1;

[0066] The above inorganic pigment was prepared in the same manner as in Example 1.

[0067] Comparative Example 3

[0068] This comparative example provides an inorganic pigment, comprising the following components in mass percentage: micron Cr2O3 15%, micron Co2O3 30%, nano ZnO 6%, nano Al2O3 10%, nano SiO2 10%, nano SrO 15%, nano BaO 5% and nano Y2O3 9%;

[0069] Its preparation method is the same as that of Example 1;

[0070] The above inorganic pigment was prepared in the same manner as in Example 1.

[0071] Comparative Example 4

[0072] This comparative example provides an inorganic pigment, comprising the following components in mass percentage: micron Cr2O3 20%, micron Co2O3 26%, nano ZnO 6%, nano Al2O3 10%, nano SiO2 10%, nano SrO 10%, nano BaO 5% and nano Y2O3 13%;

[0073] Its preparation method is the same as that of Example 1;

[0074] The above inorganic pigment was prepared in the same manner as in Example 1.

[0075] Application Examples

[0076] The green hyperspectral camouflage inorganic pigments prepared in Examples 1-3 and the inorganic pigments prepared in Comparative Examples 1-4 were tested, and the specific test standards and test results are shown in Table 1-2:

[0077] Table 1 Test results

[0078] Test items Testing standards Detection indicators Example 1 Example 2 Example 3 1200nm reflectivity GB / T 3979-2008 40％-60％ 59％ 57％ 56％ 1400nm reflectivity GB / T 3979-2008 30％-50％ 38％ 34％ 32％ 1800nm ​​reflectivity GB / T 3979-2008 20％-40％ 39％ 38％ 36％ 2500nm reflectivity GB / T 3979-2008 ＜20％ 17％ 19％ 18％ k value GJB7928-2012 ≥10 12.4 11.2 12.3

[0079] Table 2 Test results

[0080]

[0081] According to Tables 1-2, the green hyperspectral camouflage inorganic pigment provided by the present invention has a spectral reflectivity of 59% at 1200nm, 38% at 1400nm, 39% at 1800nm, and 17% at 2500nm. The K values ​​of the prepared green hyperspectral camouflage inorganic pigments are all above 10. The reflectivity of the green hyperspectral camouflage inorganic pigment provided by the present application is similar to that of green plants, and can be integrated with the natural background to achieve a camouflage effect.

[0082] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent substitution or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A green hyperspectral camouflage inorganic pigment, characterized in that: The invention comprises the following components in mass percentage: micron Cr2O3 10%-30%, micron Co2O3 30%-50%, nano ZnO 6%-15%, nano Al2O3 5%-15%, nano SiO2 3%-10%, nano SrO 3%-10%, nano BaO 3%-5% and nano Y2O3 5%-10%; The particle size of the micron Cr2O3 is 20μm-50μm; the particle size of the micron Co2O3 is 20μm-50μm; The preparation method of the green hyperspectral camouflage inorganic pigment comprises the following steps: Step a, weighing each component according to the designed ratio, wet-milling the weighed nano-Cr2O3, nano-Co2O3, nano-ZnO, nano-Al2O3, nano-SiO2, nano-SrO, nano-BaO and nano-Y2O3 at a speed of 2500r / min-3500r / min for 2h-4h to obtain a mixed slurry; Step b, vacuum drying the mixed slurry until the moisture content is ≤0.1% to obtain a dry material; Step c, dry-grinding the dried material at a rate of 800 r / min-1200 r / min for 1.5 h-2.5 h to obtain a ground material; Step d, heating the ground material to 1250° C.-1400° C., keeping the temperature for 3.5 h-4.5 h, and cooling to obtain a primary green hyperspectral camouflage inorganic pigment; Step e: dry-grind the primary green hyperspectral camouflage inorganic pigment at a rotation speed of 1500 r / min-2000 r / min for 25 min-30 min, and sieve to obtain the green hyperspectral camouflage inorganic pigment.

2. The green hyperspectral camouflage inorganic pigment according to claim 1, characterized in that: The particle size of the nano ZnO is 30nm-100nm; and / or The particle size of the nano-Al2O3 is 30nm-200nm.

3. The green hyperspectral camouflage inorganic pigment according to claim 1, characterized in that: The particle size of the nano-SiO2 is 50nm-200nm; and / or The particle size of the nano-SrO is 30nm-50nm.

4. The green hyperspectral camouflage inorganic pigment according to claim 1, characterized in that: The particle size of the nano-BaO is 50nm-200nm; and / or The particle size of the nano Y2O3 is 100nm-200nm.

5. A method for preparing the green hyperspectral camouflage inorganic pigment according to any one of claims 1 to 4, characterized in that: The steps include: Step a, weighing each component according to the designed ratio, wet-milling the weighed nano-Cr2O3, nano-Co2O3, nano-ZnO, nano-Al2O3, nano-SiO2, nano-SrO, nano-BaO and nano-Y2O3 at a speed of 2500r / min-3500r / min for 2h-4h to obtain a mixed slurry; Step b, vacuum drying the mixed slurry until the moisture content is ≤0.1% to obtain a dry material; Step c, dry-grinding the dried material at a rate of 800 r / min-1200 r / min for 1.5 h-2.5 h to obtain a ground material; Step d, heating the ground material to 1250° C.-1400° C., keeping the temperature for 3.5 h-4.5 h, and cooling to obtain a primary green hyperspectral camouflage inorganic pigment; Step e: dry-grind the primary green hyperspectral camouflage inorganic pigment at a rotation speed of 1500 r / min-2000 r / min for 25 min-30 min, and sieve to obtain the green hyperspectral camouflage inorganic pigment.

6. The method for preparing the green hyperspectral camouflage inorganic pigment as claimed in claim 5, characterized in that: In step a, the conditions for wet ball milling are: the particle size of the grinding balls is 2 cm, the ball milling medium is anhydrous ethanol, the material-ball ratio is 1:7-8, and the mass ratio of solid material to anhydrous ethanol is 1:1.5-2.

7. The method for preparing the green hyperspectral camouflage inorganic pigment as claimed in claim 5, characterized in that: In step b, the vacuum drying temperature is 70°C-80°C.

8. The method for preparing the green hyperspectral camouflage inorganic pigment according to claim 5, characterized in that: In step c, the dry grinding conditions are as follows: the material-ball ratio is 1:20-25, and the grinding balls are mixed steel balls of 5 mm grinding balls and 8 mm grinding balls with a mass ratio of 2-3:

1.

9. The method for preparing the green hyperspectral camouflage inorganic pigment as claimed in claim 5, characterized in that: In step e, the dry grinding conditions are: the material-ball ratio is 1:10-15, and the grinding balls are mixed steel balls of 5 mm grinding balls and 8 mm grinding balls with a mass ratio of 2-3:1; and / or In step e, the sieving condition is: passing through a 400-mesh sieve.

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