CN115678404A - Urban near-infrared camouflage coating, preparation method thereof, corresponding fabric and preparation method thereof - Google Patents
Urban near-infrared camouflage coating, preparation method thereof, corresponding fabric and preparation method thereof Download PDFInfo
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- CN115678404A CN115678404A CN202211378783.8A CN202211378783A CN115678404A CN 115678404 A CN115678404 A CN 115678404A CN 202211378783 A CN202211378783 A CN 202211378783A CN 115678404 A CN115678404 A CN 115678404A
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Abstract
The invention belongs to the technical field of military equipment, and particularly discloses a near-infrared camouflage coating for cities, which comprises the following raw materials of active ingredients in percentage by mass: 1-50 parts of aluminum powder, 49-100 parts of resin, 0.1-5 parts of thickening agent and 0.1-5 parts of defoaming agent. The invention also discloses a preparation method of the urban near-infrared camouflage coating, an urban near-infrared camouflage fabric coated with the urban near-infrared camouflage coating and a preparation method of the urban near-infrared camouflage fabric. The urban near-infrared camouflage paint and the urban near-infrared camouflage fabric can be suitable for multiple urban background environments, are completely fused with the environments, and have a good near-infrared camouflage effect.
Description
Technical Field
The invention belongs to the technical field of military equipment, and relates to near-infrared camouflage, in particular to a near-infrared camouflage coating for a city, a preparation method thereof, a corresponding fabric and a preparation method thereof.
Background
With the wide application of modern reconnaissance technology and accurate guided weapons in battlefields, the traditional visible light camouflage technology cannot meet the requirements, and most of military forces in developed countries are equipped with various infrared reconnaissance equipment to different degrees, such as an image intensifier, a low-light television system, a starlight lens, a weapon sight and various night vision outfits.
The application of the near infrared detector enables military operations not to be separated into daytime and night, and becomes an indispensable reconnaissance tool for military troops of various countries. Near-infrared camouflage, also known as "near-infrared surveillance camouflage," makes it difficult for surveillance and guidance equipment operating at a wavelength of about 0.76 to 2.50 microns to perform surveillance, guidance, or optical camouflage that creates illusions.
In recent years, the near infrared camouflage technology is rapidly developed, especially in the military industry. Numerous researchers and researchers have conducted intensive research into near infrared camouflage technology, particularly in jungle and desert environments.
However, there is less research on near-infrared camouflage of urban environments. Compared with jungles and deserts, the environment of the city is characterized by comprising building materials such as cement, asphalt, bricks and the like, and corresponding camouflage treatment needs to be carried out aiming at the common background environment of the city when the near-infrared camouflage is carried out aiming at the city environment.
Disclosure of Invention
The invention aims to provide a near-infrared camouflage paint for a city, which can be suitable for a plurality of urban background environments; the invention also aims to provide a preparation method of the near-infrared camouflage paint for the city.
A third object of the present invention is to provide an urban near-infrared camouflage fabric coated with the above urban near-infrared camouflage paint; the fourth purpose of the invention is to provide a preparation method of the near infrared camouflage fabric for the city.
In order to achieve the purpose, the invention adopts the following technical scheme:
the near-infrared camouflage coating for the city comprises the following raw materials of active ingredients in percentage by mass: 1-50 parts of aluminum powder, 49-100 parts of resin, 0.1-5 parts of thickening agent and 0.1-5 parts of defoaming agent.
As a limitation, the raw materials for preparing the effective components are as follows by mass fraction: 15 parts of aluminum powder, 85 parts of resin, 1.5 parts of thickening agent and 1.5 parts of defoaming agent, wherein the particle size of the aluminum powder is 50nm-50 mu m.
The preparation method of the near-infrared camouflage paint for the city is characterized by comprising the following steps:
s1, weighing the raw materials in proportion;
s2, uniformly mixing the raw materials to obtain the near-infrared camouflage coating for the city.
The invention also discloses a near-infrared camouflage fabric for cities, which is prepared by adopting the near-infrared camouflage coating for cities.
The invention further discloses a preparation method of the near-infrared camouflage fabric for the city, which comprises the following steps:
t1, pre-treatment of polyester-cotton fabric
Preparing 50g/L-160g/L NaOH solution, and heating to 50-70 ℃; putting the polyester-cotton fabric to be pretreated into the NaOH solution, carrying out constant-temperature treatment for 10-20 min, and then drying to obtain a pretreated fabric;
t2, coating
And (2) placing the pretreated fabric flatly, then coating the urban near-infrared camouflage paint on the surface of the pretreated fabric, drying the pretreated fabric in an environment of 80-100 ℃ for 30-60 min, and finally airing the pretreated fabric to 20-30 ℃ to obtain the urban near-infrared camouflage fabric.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the technical progress that:
(1) The urban near-infrared camouflage paint and the urban near-infrared camouflage fabric can be suitable for multiple urban background environments, are completely fused with the environment, and have a good near-infrared camouflage effect;
(2) The urban near-infrared camouflage fabric provided by the invention has high slurry viscosity and is suitable for coating treatment;
(3) The urban near-infrared camouflage fabric provided by the invention has good air permeability, is suitable for long-time wearing and is suitable for long-time camouflage in military use;
(4) The urban near-infrared camouflage fabric provided by the invention has strong rubbing fastness and long service life;
(5) After the urban near-infrared camouflage fabric is soaped twice, the near-infrared camouflage effect is not attenuated, the urban near-infrared camouflage fabric can be recycled, and the urban near-infrared camouflage fabric is energy-saving, environment-friendly and cost-saving;
(6) According to the invention, after the urban near-infrared camouflage coating is coated, the tensile fracture performance of the fabric is increased, and the service life of the fabric can be prolonged;
(7) In the invention, the preparation process of the urban near-infrared camouflage coating is simple and easy to realize;
(8) In the invention, when the near-infrared camouflage fabric for cities is prepared, because the contact between a chemical additive and a coating and fibers is hindered by the existence of the sizing agent, the subsequent coating fastness is influenced, and therefore, the polyester-cotton fabric needs to be pretreated;
(9) According to the invention, the NaOH solution is adopted to pretreat the polyester-cotton fabric, so that oil and impurities on the surface of the polyester-cotton fabric can be washed away, preparation is made for subsequent processes, and the quality of the finally prepared urban near-infrared camouflage fabric is improved;
(10) In the coating process of the invention when preparing the near-infrared camouflage fabric for cities, the drying time is 30-60 min, and in the process, the numerical value in the coating and the polyester-cotton fabric generate covalent crosslinking reaction, so that the washability and firmness of the coating can be finally improved.
The invention belongs to the technical field of military equipment and is used for near infrared camouflage.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
In the drawings:
fig. 1a to fig. 1e are graphs comparing the physical effects of fabric No. 1, fabric No. 2, fabric No. 3, fabric No. 4 and fabric No. 5 in 20 according to the embodiment of the present invention;
FIG. 2 is a physical diagram of a near-infrared camouflage fabric for cities in embodiment 21 of the invention;
FIG. 3a is a real object diagram of a near infrared camouflage fabric for cities under a cement background in example 21 of the invention, and FIG. 3b is a corresponding near infrared camouflage effect diagram;
FIG. 4a is a real image of a near infrared camouflage fabric for urban use in a grass background according to example 21 of the present invention, and FIG. 4b is a corresponding near infrared camouflage effect diagram;
fig. 5a is a real object diagram of a near infrared camouflage fabric for cities in a trunk background according to embodiment 21 of the invention, and fig. 5b is a corresponding near infrared camouflage effect diagram;
fig. 6a is a real object diagram of a near-infrared camouflage fabric for a city in a wood background according to embodiment 21 of the invention, and fig. 6b is a corresponding near-infrared camouflage effect diagram;
FIG. 7a is a real object of a near infrared camouflage fabric for a city in a fallen leaf clump background in example 21 of the invention, and FIG. 7b is a corresponding near infrared camouflage effect graph;
FIG. 8 is a graph showing the result of measuring the air permeability of the near-infrared camouflage fabric for urban use in embodiment 22 of the present invention;
FIG. 9 is a graph showing the crockfastness test of the near infrared camouflage fabric for urban use in example 23 of the present invention;
FIGS. 10a to 10e are diagrams showing the coated fabric after being soaped 1, 2, 3, 4, and 5 times, respectively, in one-to-one correspondence according to example 24 of the present invention;
FIG. 11a is a drawing of a fabric placed in a grass tuft in accordance with example 24 of the present invention;
FIGS. 11 b-11 f are graphs showing the near infrared camouflage effect in the grass corresponding to the fabrics soaped 1, 2, 3, 4, 5 times in example 24 of the present invention one by one, respectively;
FIG. 12a is a representation of a fabric of example 24 of the present invention before it is placed in cement;
12 b-12 f are graphs corresponding to the near infrared camouflage effect of the textile soaped 1, 2, 3, 4 and 5 times in the embodiment 24 of the invention before the cement;
FIG. 13a is a pictorial representation of a fabric of example 24 in accordance with the present invention, prior to being laid on a wood panel;
FIGS. 13b to 13f are graphs showing the near infrared camouflage effect of the textile before the wood board, wherein the textile is soaped 1, 2, 3, 4, 5 times in the embodiment 24 of the invention;
FIG. 14 is a graph comparing the tensile break strength properties of fabrics of example 25 of the present invention before and after application of the coating;
FIG. 15 is a graph of the results of averaging the tensile breaking strength in the warp and weft directions of 5 tissues before and after coating in example 25 of the present invention.
Detailed Description
Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only for illustrating and explaining the present invention and are not to be considered as limiting the present invention.
Examples 1-10 near-infrared camouflage paint for cities
In this embodiment 1 to 10, a near infrared camouflage paint for cities is disclosed, and the raw materials and the amounts of the effective components are shown in table 1 below:
TABLE 1
In examples 1 to 10, the aluminum powder bodies were aluminum powder bodies having a particle size specification of 5 μm produced by New Material science and technology Limited, which was last in sea; the resin is 40% resin produced by Hefei Tai Rui New Material science and technology Limited, and the component of the resin is aqueous polyurethane 601-A; the thickener is STK-8011 thickener produced by new material GmbH of strontium Tongjing Zhejiang; the antifoaming agent is STK-8311 antifoaming agent produced by new material GmbH of strontium Tongjing Zhejiang.
In fact, the particle size of the aluminum powder may be 50nm to 50 μm.
Example 11 preparation method of near-infrared camouflage paint for cities
This example was used to prepare examples 1-10, the specific procedure was carried out in the following order of steps:
s1, weighing the raw materials in proportion;
and S2, uniformly mixing the raw materials to obtain the near-infrared camouflage paint for the city.
Example 12 near infrared camouflage fabric for urban use
This example was made using the urban near infrared camouflage paint prepared in example 11. The near-infrared camouflage paint for the cities is coated on the surface of the corresponding fabric.
Example 13 preparation of near-infrared camouflage Fabric for urban use
This example was used to prepare example 12 by following the following sequence of steps:
t1, pre-treatment of polyester-cotton fabric
Preparing 80g/L NaOH solution, and heating to T 1 =60 ℃; putting the polyester-cotton fabric to be pretreated into the NaOH solution, and carrying out constant-temperature treatment t 1 =20min, then drying to obtain the pretreated fabric;
t2, coating
The pretreated fabric is placed flatly, then the city near-infrared camouflage paint is coated on the surface of the pretreated fabric, and then T is carried out 2 Dry t in 90 deg.C environment 2 =30min, and finally dried to T 3 And =25 ℃, thus obtaining the urban near-infrared camouflage fabric.
Examples 14 to 19 preparation method of near-infrared camouflage fabric for cities
Examples 14 to 19 respectively disclose a method for preparing a near infrared camouflage fabric for cities, the general process is the same as that of example 13, except that the specific process parameters are different, and the related parameters are as shown in the following table 2:
TABLE 2
The fabrics to be pretreated used in examples 13 to 19 were polyester cotton fabrics. The presence of the sizing agent hinders the contact of the chemical auxiliary agent and the coating with the fiber and influences the subsequent coating fastness, so that in the examples 13-19, the polyester-cotton fabric needs to be pretreated by adopting a NaOH solution, the oil and impurities on the surface of the polyester-cotton fabric can be washed away, the preparation is made for the subsequent process, and the quality of the finally prepared near-infrared camouflage fabric for the city is improved. Although the heat resistance of the fabric is good, the alkali resistance of the terylene is inferior to that of cotton, and the terylene is easy to hydrolyze under high-temperature alkali shrinkage, so that the temperature should be carefully controlled according to the parameters specified in the examples during the pretreatment processing.
The following 5 samples were selected from the city near-infrared camouflage textiles prepared in examples 13 to 19 and tested, and the formulas of the city near-infrared camouflage paint coated with the 5 samples were one-to-one corresponding to the formulas of examples 1, 2, 3, 4 and 5, wherein the formulas of fabric No. 1, fabric No. 2, fabric No. 3, fabric No. 4 and fabric No. 5 were sequentially used. The detection items comprise paint viscosity detection, near-infrared camouflage performance detection, air permeability detection, friction fastness test, soaping color fastness test and breaking strength test. The coating layer mentioned below refers to a coating layer formed by coating a surface of a corresponding fabric with a near infrared camouflage paint in cities.
Example 20 City near-Infrared camouflage paint viscosity detection
The viscosity of 5 coatings with different concentrations corresponding to fabric No. 1, fabric No. 2, fabric No. 3, fabric No. 4 and fabric No. 5 were measured by using a rotary viscometer model NDJ-1 from Shanghai balance instruments and meters. Firstly, through calibrating a viscometer, selecting a No. 3 rotor, setting a rotating speed of 6 rpm to measure fabrics coated with coatings with different concentrations, wherein the total amount of the coatings coated on each fabric is 20g, fabric No. 1, fabric No. 2, fabric No. 3, fabric No. 4 and fabric No. 5, the real effect contrast graphs correspond to one another as shown in figures 1a, 1b, 1c, 1d and 1e, the noted percentage in the graphs is the proportion of aluminum powder when the total amount of the aluminum powder and the resin is taken as 100%, and the percentages appearing in subsequent graphs are the same.
As can be seen from FIG. 1, the aluminum powder accounts for a significant difference in color shade from the fabric coated with different coatings, and the fabric with a larger aluminum powder accounts for a darker color, whereas the fabric with a lighter color is obtained. The detection proves that the viscosity value of each group of coatings increases along with the gram weight of the aluminum powder, and the viscosity value also increases. Therefore, the viscosity of the paint is affected by the aluminum powder content, and the larger the aluminum powder content is, the larger the paint viscosity is.
Example 21 near-infrared camouflage Performance detection of near-infrared camouflage textiles for City use
In this embodiment, taking the coating prepared according to the formula of example 3 as an example, the near infrared camouflage effect of the corresponding urban near infrared camouflage fabric is detected by using an oldham CS-6 infrared digital night vision device, for example, fig. 2 is an actual image of the corresponding urban near infrared camouflage fabric, fig. 3a is an actual image of the urban near infrared camouflage fabric under a cement background, and fig. 3b is a corresponding near infrared camouflage effect image. Fig. 4a is a real image of a city near-infrared camouflage fabric under a grass background, and fig. 4b is a corresponding near-infrared camouflage effect image. Fig. 5a is a real image of a city near-infrared camouflage fabric under the background of a trunk, and fig. 5b is a corresponding near-infrared camouflage effect image. Fig. 6a is a real image of a near-infrared camouflage fabric for a city under a wood board background, and fig. 6b is a corresponding near-infrared camouflage effect image. Fig. 7a is a picture of a city near infrared camouflage fabric in a background of a fallen leaf cluster, and fig. 7b is a corresponding picture of a near infrared camouflage effect.
In the near-infrared camouflage performance characterization of the five groups of environments, the color difference between the urban near-infrared camouflage fabric and the background environment is compared, and the three levels are as follows: complete fusion, approximate fusion, no fusion. Complete fusion: the difference between the coated cloth and the background environment is hardly seen; approximate fusion: we can see the profile of the coated cloth; no fusion: we can directly distinguish the coated cloth from the background environment. As can be seen from fig. 3 to fig. 7, in the five groups of environments, the test effects are completely integrated, which indicates that the near-infrared camouflage fabric for the city prepared by the embodiment of the invention has a good near-infrared camouflage effect.
Through detection, the camouflage effect of complete fusion is achieved when the camouflage coating is applied to the fabric by the paint prepared when the aluminum powder is 15 parts, the resin is 85 parts, and the thickening agent and the defoaming agent are 1.5 parts and 1.5 parts respectively.
In addition, the detection proves that the coating prepared in the examples 1, 2, 4 and 5 has a completely fused camouflage effect when used for camouflage coating of the fabric.
Example 22 detection of air permeability of near-infrared camouflage textiles for urban use
The air permeability of the No. 1 fabric, the No. 2 fabric, the No. 3 fabric, the No. 4 fabric and the No. 5 fabric was measured by using a Fabric air permeability tester of a Boleyde YG461E model. Analyzing the change of the air permeability of the fabric before and after coating, measuring 5 groups of each group of air permeability, taking the average value of the measured values, and obtaining the test result as shown in figure 8, wherein the overall trend of the three groups of data is consistent, the air permeability of each group of data is the best in a white cloth state, the air permeability of the fabric gradually begins to decrease under the condition that the mass ratio of aluminum powder in the coating is increased, the amount of aluminum powder is 25 parts, and the influence on the air permeability of the fabric is the largest when the amount of resin is 75 parts, so that the air permeability of the fabric can be obtained to continuously decrease along with the increase of the concentration of the coating; when the mass of the aluminum powder is less than 25 parts and the mass of the resin is more than 75 parts, the air permeability of the fabric is good.
Example 23 crocking fastness test of City near Infrared camouflage Fabric
The rubbing fastness of the fabric No. 1 was analyzed by a rubbing fastness tester, model Y571G, karster instruments Co., ltd. In Shandong, and the staining rating of the dry and wet rubbing cloth and coated fabric of the sample is shown in FIG. 9. By analyzing the staining series of the coating on the polyester-cotton fabric in fig. 9, it can be seen that the overall trend is slower when the coating is dry-rubbed than when the coating is wet-rubbed, and after 5 times of dry-rubbing, the staining series of the sample is 4, and the staining series of the wet-rubbing is 3; in the process of 2-5 times of rubbing, the dry rubbing is reduced by a gradient in 2-3 times, the gradient is reduced in 4-5 times, and the wet rubbing is reduced by a gradient in 2-3 times, 3-4 times, 4-5 times, so that the dry rubbing of the polyester-cotton fabric is slightly changed in the experimental process, the wet rubbing is greatly changed in the experimental process, the rubbing fastness of the polyester-cotton fabric is influenced by a humid environment, and the more humid the environment, the more influenced the coating fastness is. The result shows that the prepared urban near-infrared camouflage fabric has strong wear resistance.
Through detection, the wear resistance of the fabric No. 2, the fabric No. 3, the fabric No. 4 and the fabric No. 5 is high.
Example 24 soaping fastness test of near Infrared camouflage textiles for urban use
Selecting No. 1 fabric, sequentially soaping for 1-5 times under the soaping action of a 30 ℃ color fastness to washing tester, wherein the soaping time is 30min each time, taking out the fabric to be tested after the soaping is finished, cleaning the fabric, and drying the fabric in an oven. The fabric object diagrams after 1, 2, 3, 4 and 5 soapings respectively correspond to fig. 10a, fig. 10b, fig. 10c, fig. 10d and fig. 10e one by one. We can see that the coating effect of the fabric changes obviously after different times of soaping. The more the number of soapings, the longer the soaping time, the more the associated fabric coating effect is affected.
And (3) selecting three background environments of a grass, cement and wood board for shooting at night by using an infrared digital night vision device, and comparing the change of the near-infrared camouflage effect.
Fig. 11 is a photograph in a grass environment, in which fig. 11a is a real image of a fabric placed in a grass, and fig. 11b, fig. 11c, fig. 11d, fig. 11e and fig. 11f are near infrared camouflage effect diagrams of the fabric which is soaped 1, 2, 3, 4 and 5 times in a one-to-one correspondence manner, respectively.
Fig. 12 is a photograph of cement environment, in which fig. 12a is a real image of the fabric before the cement, and fig. 12b, 12c, 12d, 12e and 12f are drawings showing the near infrared camouflage effect of the fabric which is soaped 1, 2, 3, 4 and 5 times.
Fig. 13 is a photographed image in a wood board environment, wherein fig. 13a is a real image of a fabric placed in front of a wood board, and fig. 13b, 13c, 13d, 13e and 13f are near infrared camouflage effect images of the fabric which is soaped 1, 2, 3, 4 and 5 times in a one-to-one correspondence manner respectively.
According to the contrast analysis of the pictures shot by three groups of near-infrared night vision devices, namely the grass, the cement and the wood board, the outline of the fabric is more and more obvious along with the increase of the soaping times, so that the near-infrared effect of the fabric can be influenced by the soaping time, and the longer the soaping time is, the greater the influence on the near-infrared camouflage effect of the urban near-infrared camouflage fabric is. In addition, after the first time of soaping and the second time of soaping, the near infrared effect of the fabric is not greatly different from the background, the outline of the fabric after the third time of soaping is slowly exposed under the near infrared effect, the near infrared effect is gradually influenced, the outline of the fabric after the fourth time of soaping is basically approximately visible, the near infrared camouflage effect is not greatly influenced, the outline of the fabric after the fifth time of soaping is clear and visible, and the near infrared camouflage effect is greatly influenced.
In this example, 12A model color fastness to washing tester, produced by Hangzhou Ded as Instrument science and TECHNOLOGY, SFJJ standard soap chips, as supervised by the textile industry TECHNOLOGY in Shanghai, and ORPHA OPTICS TECHNOLOGY CO, TD CS-6 infrared digital night vision device were used.
Through detection, the quality of the No. 1 fabric is not obviously reduced within twice soaping times, the surface is not obviously damaged, and the near-infrared camouflage effect is not influenced by the soaping.
In addition, it was determined that the greater the resin mass fraction, the greater the soapy color fastness of the coated fabric.
Example 25 near infrared camouflage Fabric breaking Strength test for cities
And respectively measuring the tensile mechanical properties of the fabric coated with the coating and the fabric not coated with the coating, comparing the tensile breaking strengths of the fabric in the warp direction and the weft direction, and respectively taking five groups of data of the tensile breaking strengths in the warp direction and the weft direction and averaging the five groups of data.
From the comparison of tensile breaking strength performance of the fabric before and after coating with the coating in fig. 14, it can be seen that the tensile breaking strength of the fabric before and after coating with the coating changes, the tensile breaking strength of the fabric before and after coating fluctuates around 700N, while the tensile breaking strength of the fabric after coating is over 750N, and the tensile breaking strength of the fabric after coating is obviously increased compared with that before; meanwhile, the tensile breaking strength of the warp-wise fabric before and after coating is changed similarly, the tensile breaking strength of the warp-wise fabric before coating is shown as a curve in the figure, the tensile breaking strength floats up and down at 800N and is not changed greatly, the tensile breaking strength of the warp-wise fabric after coating is shown as a purple curve in the figure and is over 900N, and the tensile breaking strength of the warp-wise fabric after coating is obviously increased compared with that before coating.
FIG. 15 is a graph of the results of averaging the tensile breaking strength in the warp and weft directions of 5 tissue samples before and after coating, and it can be seen from the graph that the tensile breaking strength in the warp and weft directions of the coated fabric is significantly enhanced compared to that before the coating is not applied.
As can be seen from this example, the application of the coating increased the tensile failure properties of the fabric.
Claims (5)
1. The near-infrared camouflage coating for the city is characterized by comprising the following raw materials of active ingredients in percentage by mass: 1-50 parts of aluminum powder, 49-100 parts of resin, 0.1-5 parts of thickening agent and 0.1-5 parts of defoaming agent.
2. The urban near-infrared camouflage paint as claimed in claim 1, wherein the raw materials for preparing the active ingredients thereof are, in mass fraction: 15 parts of aluminum powder, 85 parts of resin, 1.5 parts of thickening agent and 1.5 parts of defoaming agent, wherein the particle size of the aluminum powder is 50nm-50 mu m.
3. A method of preparing a near infrared camouflage paint for urban use according to claim 1 or 2, wherein the method comprises the following steps in the following order:
s1, weighing the raw materials in proportion;
s2, uniformly mixing the raw materials to obtain the near-infrared camouflage coating for the city.
4. An urban near-infrared camouflage fabric, which is made of the urban near-infrared camouflage paint according to claim 1 or 2.
5. A method of making an urban near infrared camouflage fabric as set forth in claim 4, wherein the steps are performed in the following order:
t1, pretreatment of polyester-cotton fabric
Preparing 50g/L-160g/L NaOH solution, and heating to 50-70 ℃; putting the polyester-cotton fabric to be pretreated into the NaOH solution, carrying out constant-temperature treatment for 10-20 min, and then drying to obtain a pretreated fabric;
t2, coating
And (3) flatly placing the pretreated fabric, then coating the urban near-infrared camouflage paint on the surface of the pretreated fabric, drying the pretreated fabric in an environment of 80-100 ℃ for 30-60 min, and finally airing the pretreated fabric to 20-30 ℃ to obtain the urban near-infrared camouflage fabric.
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