Preparation method of infrared stealth fabric, infrared stealth fabric prepared through preparation method and application of infrared stealth fabric

Abstract

The invention provides a preparation method of an infrared stealth fabric, the infrared stealth fabric prepared by the preparation method and application, and relates to the field of wearable infrared stealth clothes. The preparation method of the infrared stealth fabric comprises the following steps: (1) adhering porous net films to two sides of base cloth through hot pressing to obtain composite cloth; dipping the composite cloth in a buffer solution of dopamine hydrochloride, and carrying out pretreatment to obtain PDA-treated composite cloth; (2) dipping the PDA-treated composite cloth in a silver nitrate solution, and carrying out activating treatment to obtain activated composite cloth; and (3) dipping the activated composite cloth in a silver-ammonia solution, adding a reducing agent, and carrying out ultrasonic treatment to obtain the infrared stealth fabric. The fabric prepared by the invention has the characteristics of low infrared emission, breathability, high conductivity and the like, and can realize outdoor infrared stealth.

Description

Technical Field

[0001] The invention relates to the field of wearable infrared stealth clothing, and in particular to a method for preparing infrared stealth fabric, the infrared stealth fabric prepared thereby, and applications thereof. Background Art

[0002] In a cold environment, maintaining thermal comfort is the basis of human physiological health, and clothing is essential for effectively regulating body temperature. Traditional fabrics mainly achieve effective human warmth by reducing heat conduction and heat convection. However, about 50% of the heat loss of the human body is achieved through mid-infrared radiation. Traditional fabrics have the characteristics of high emissivity in the mid-infrared wavelength range (7-14μm) and cannot effectively suppress human thermal radiation. With the development of new textiles with high infrared reflectivity and low infrared emissivity, more and more research has been conducted on regulating the emissivity of fabrics in the mid-infrared band. These studies aim to suppress the heat loss caused by human infrared radiation, thereby enhancing local thermal radiation management and giving fabrics infrared stealth capabilities.

[0003] With the rapid development of infrared detection technology and infrared imaging technology, infrared detection technology has become increasingly important in military warfare, making infrared stealth technology highly valued. According to the Stefan-Boltzmann law, the radiation capacity of a target is determined by the emissivity and temperature, so the basic way to achieve infrared stealth is to control the surface temperature of the target object so that the temperature difference between the detected target and the surrounding environment is as small as possible; control the surface emissivity of the target object so that the infrared radiation contrast between the target and the background is as small as possible. However, the organic molecular structure and organizational structure of ordinary textile materials make their surface emissivity very high, making it difficult to avoid detection and tracking by infrared detectors.

[0004] Based on this, researchers have modified textiles using low infrared emission materials through impregnation, surface coating, magnetron sputtering and other technologies on the basis of traditional fabrics, and developed various low infrared emission textiles. However, there are still some problems in existing research, especially the comfort needs of humans. Traditional fabrics have larger pores and usually have good air permeability. However, larger pores are conducive to the penetration of infrared radiation, resulting in higher mid-infrared emissivity. The pore size of existing low infrared emission fabrics is usually smaller than the wavelength of infrared radiation, which hinders the penetration of mid-infrared radiation emitted by the human body. This results in low infrared emission modification usually resulting in a significant reduction in pore size and air permeability. In addition, low infrared emission materials used for fabric modification usually have conductive properties, giving the fabric conductivity. However, the pore size of the fabric also affects the conductivity. Larger pores lead to lower electron density, which reduces conductivity. This complex interaction makes polymer fabrics contradictory in balancing low infrared emission, air permeability and conductivity.

[0005] Therefore, it is of great significance to develop a wearable fabric that can integrate low infrared emission, breathability and conductivity.

[0006] In view of this, the present invention is proposed. Summary of the invention

[0007] The purpose of the present invention is to provide a method for preparing infrared stealth fabric, and the infrared stealth fabric prepared thereby and its application. The infrared stealth fabric prepared by the preparation method of the present invention has the advantages of low infrared emission, air permeability and high conductivity.

[0008] In order to achieve the above-mentioned purpose of the present invention, the following technical solutions are particularly adopted:

[0009] In a first aspect, the present invention provides a method for preparing an infrared stealth fabric, the method for preparing the infrared stealth fabric comprising the following steps:

[0010] (1) adhering a porous mesh to both sides of a base fabric by hot pressing to obtain a composite fabric; immersing the composite fabric in a buffer solution of dopamine hydrochloride for pretreatment to obtain a PDA-treated composite fabric;

[0011] (2) immersing the PDA-treated composite fabric in a silver nitrate solution for activation treatment to obtain an activated composite fabric;

[0012] (3) Immersing the activated composite fabric in a silver ammonia solution, adding a reducing agent, and performing ultrasonic treatment to obtain an infrared stealth fabric.

[0013] Preferably, in step (1), the pore size of the porous mesh is 40 to 80 μm; the gram weight of the porous mesh is 15 to 25 g / m 2 .

[0014] Preferably, in step (1), the material of the porous mesh membrane includes any one of PA, PU, ​​PES, TPU, PE, PP, PET, PLA or PO, or a combination of at least two thereof, preferably PA.

[0015] Preferably, in step (1), the thickness of the base fabric is 0.1 to 0.15 mm; the density of the base fabric is 0.35 to 0.45 g / cm 3 The pore size of the base fabric is 50 to 90 μm.

[0016] Preferably, in step (1), the material of the base fabric includes any one of PA, PU, ​​PES, TPU, PE, PP, PET, PLA or PO, or a combination of at least two thereof, preferably PA.

[0017] Preferably, in step (1), the material of the porous mesh is the same as the material of the base fabric.

[0018] Preferably, in step (1), the temperature of the hot pressing is 120 to 140° C., and the time of the hot pressing is 20 to 50 seconds.

[0019] Preferably, in step (1), the concentration of dopamine hydrochloride in the dopamine hydrochloride buffer solution is 1 to 5 g / L.

[0020] Preferably, in step (1), the buffer solution is selected from Tris sustained-release solution.

[0021] Preferably, the concentration of the Tris sustained-release solution is 10-30 mM.

[0022] Preferably, in step (1), the pretreatment temperature is 30-40° C., and the pretreatment time is 1-3 h.

[0023] Preferably, in step (2), the concentration of the silver nitrate solution is 20-30 g / L.

[0024] Preferably, in step (2), the volume ratio of the area of ​​the composite cloth treated with PDA to the volume of the silver nitrate solution is (50-60) cm 2 :(90~120)mL.

[0025] Preferably, in step (2), the temperature of the activation treatment is 25 to 35° C., and the time of the activation treatment is 20 to 40 minutes.

[0026] Preferably, in step (3), the silver ammonia solution is prepared by the following steps:

[0027] Ammonia water is added dropwise to the silver nitrate solution, and the addition is continued after precipitation occurs until the solution becomes clear, thereby obtaining the silver ammonia solution.

[0028] Preferably, in step (3), the concentration of the silver nitrate solution is 25-35 g / L.

[0029] Preferably, in step (3), before adding the reducing agent, the temperature of the immersion in the silver ammonia solution is 25 to 35° C., and the immersion time is 3 to 5 minutes.

[0030] Preferably, in step (3), the reducing agent is glucose.

[0031] Preferably, in step (3), the mass ratio of the reducing agent to the silver nitrate used to prepare the silver ammonia solution is (0.9-1.2):1.

[0032] Preferably, in step (3), the power of the ultrasonic treatment is 100-160 W, the temperature of the ultrasonic treatment is 30-45° C., and the time of the ultrasonic treatment is 3.5-5.5 min.

[0033] In a second aspect, the present invention provides an infrared stealth fabric, which is prepared by the preparation method described in the first aspect.

[0034] Preferably, the air permeability of the infrared stealth fabric is above 20 mm / s, preferably above 22 mm / s.

[0035] Preferably, the conductivity of the infrared stealth fabric is 45000 S·m -1 Above, preferably 50000 S·m -1 above.

[0036] Preferably, the emissivity of the infrared stealth fabric is 4-20%.

[0037] In a third aspect, the present invention provides a use of the infrared invisible fabric as described in the second aspect in the preparation of outdoor clothing.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] (1) The preparation method of the infrared stealth fabric described in the present invention has the advantages of simple and safe preparation process, short cycle, mild conditions, etc., and the preparation process is passable.

[0040] (2) The infrared stealth fabric obtained by the preparation method described in the present invention has significantly improved low infrared emission, air permeability and conductivity, which can meet the comfort requirements of outdoor clothing. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0042] Figure 1 This is the spectral emissivity diagram of the infrared stealth fabric provided in Example 1.

[0043] Figure 2 This is an infrared thermal imaging image of the low infrared emission fabric provided in Example 1.

[0044] Figure 3 To measure the temperature of simulated skin covered with different fabrics in real time in an indoor environment with an ambient temperature of 26°C.

[0045] Figure 4 Air permeability graph of the low infrared emitting fabric provided for Example 1.

[0046] Figure 5 Conductivity graph of the low infrared emitting fabric provided for Example 1. DETAILED DESCRIPTION

[0047] Unless otherwise defined herein, scientific and technological terms used in conjunction with the present invention shall have the meanings commonly understood by those of ordinary skill in the art. The meaning and scope of the terms should be clear, however, in the case of any potential ambiguity, the definitions provided herein take precedence over any dictionary or external definitions. In this application, unless otherwise stated, the use of "or" means "and / or". In addition, the use of the term "including" and other forms is non-limiting.

[0048] It should be noted that specific details are described in the following description to facilitate a full understanding of the present invention. However, the present invention can be implemented in a variety of other ways different from those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0049] The embodiments of the present invention will be described in detail below in conjunction with the embodiments and examples, but it will be appreciated by those skilled in the art that the following embodiments and examples are only used to illustrate the present invention and should not be considered as limiting the scope of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of the present invention. If specific conditions are not specified, proceed according to normal conditions or conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0050] In a first aspect, the present invention provides a method for preparing an infrared stealth fabric, the method for preparing the infrared stealth fabric comprising the following steps:

[0051] (1) adhering a porous mesh to both sides of a base fabric by hot pressing to obtain a composite fabric; immersing the composite fabric in a buffer solution of dopamine hydrochloride for pretreatment to obtain a PDA-treated composite fabric;

[0052] (2) immersing the PDA-treated composite fabric in a silver nitrate solution for activation treatment to obtain an activated composite fabric;

[0053] (3) Immersing the activated composite fabric in a silver ammonia solution, adding a reducing agent, and performing ultrasonic treatment to obtain an infrared stealth fabric.

[0054] In the present invention, the composite cloth modified by deposition of dopamine hydrochloride is first activated and then prepared by chemical silver plating to obtain infrared stealth fabric. The whole preparation process is simple and safe, with a short cycle and mild conditions. The infrared stealth fabric obtained by the preparation method of the present invention has significantly improved low infrared emission, air permeability and conductivity. In particular, in step (1), the porous mesh membrane is adhered to both sides of the base fabric by hot pressing. By introducing the porous membrane, the pore size of the fabric can be reduced, solving the problem that the base fabric has a large pore size and silver nanoparticles cannot be deposited on the fabric surface. Before step (2) chemical plating, the fabric is immersed in a silver nitrate solution for activation. Silver ions are attracted by the hydroxyl and amine groups on the fabric surface, and a silver seed layer is formed on the fabric surface, which is conducive to the full progress of the chemical silver plating reaction.

[0055] As an optional embodiment, in step (1), the pore size of the porous membrane is 40 to 80 μm.

[0056] As an optional embodiment, in step (1), the gram weight of the porous web is 15 to 25 g / m 2 , for example, it can be 15g / m 2 , 16g / m 2 , 18g / m 2 , 20g / m 2 , 22g / m 2 , 24g / m 2 , 25g / m 2 wait.

[0057] As an optional embodiment, in step (1), the material of the porous mesh membrane includes any one of PA, PU, ​​PES, TPU, PE, PP, PET, PLA or PO, or a combination of at least two of them, preferably PA.

[0058] As an optional embodiment, in step (1), the thickness of the base fabric is 0.1-0.15 mm, for example, it can be 0.1 mm, 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm, etc.

[0059] As an optional embodiment, in step (1), the density of the primary base fabric is 0.35 to 0.45 g / cm 3 , for example, it can be 0.35 g / cm 3 , 0.36g / cm 3 , 0.38g / cm 3 , 0.4g / cm 3 , 0.42g / cm 3 , 0.44g / cm 3 , 0.45g / cm 3 wait.

[0060] As an optional implementation, in step (1), the pore size of the base fabric is 50 to 90 μm.

[0061] As an optional embodiment, in step (1), the material of the base fabric includes any one of PA, PU, ​​PES, TPU, PE, PP, PET, PLA or PO, or a combination of at least two of them, preferably PA.

[0062] As an optional implementation, in step (1), the material of the porous mesh is the same as the material of the base fabric.

[0063] It should be noted that in order to improve the compatibility and bonding strength between the porous mesh and the base fabric, it is preferred that the two be made of the same material. For example, when the base fabric is nylon cloth, the porous mesh is preferably a PA porous mesh.

[0064] As an optional embodiment, in step (1), the hot pressing temperature is 120-140°C, for example, 120°C, 125°C, 130°C, 135°C, 140°C, etc., and the hot pressing time is 20-50s, for example, 20s, 25s, 30s, 35s, 40s, 45s, 50s, etc.

[0065] As an optional embodiment, in step (1), the concentration of dopamine hydrochloride in the dopamine hydrochloride buffer solution is 1 to 5 g / L, for example, it can be 1 g / L, 1.2 g / L, 1.4 g / L, 1.5 g / L, 1.6 g / L, 1.8 g / L, 2 g / L, 2.2 g / L, 2.4 g / L, 2.6 g / L, 2.8 g / L, 3 g / L, 3.2 g / L, 3.4 g / L, 3.6 g / L, 3.8 g / L, 4 g / L, 4.2 g / L, 4.4 g / L, 4.6 g / L, 4.8 g / L, 5 g / L, etc.

[0066] As an optional embodiment, in step (1), the buffer solution is selected from Tris sustained-release solution.

[0067] As an optional embodiment, in step (1), the concentration of the Tris sustained-release solution is 10-30 mM, for example, it can be 10 mM, 10.5 mM, 11 mM, 11.5 mM, 12 mM, 12.5 mM, 13 mM, 14 mM, 15 mM, 16 mM, 18 mM, 19 mM, 20 mM, 22 mM, 24 mM, 26 mM, 28 mM, 30 mM, etc.

[0068] As an optional embodiment, in step (1), the pretreatment temperature is 30-40°C, for example, it can be 30°C, 31°C, 32°C, 33°C, 34°C, 35°C, 36°C, 37°C, 38°C, 39°C, 40°C, etc.

[0069] As an optional embodiment, in step (1), the pretreatment time is 1 to 3 hours, for example, it can be 1 h, 1.2 h, 1.4 h, 1.5 h, 1.6 h, 1.8 h, 2 h, 2.2 h, 2.4 h, 2.5 h, 2.6 h, 2.8 h, 3 h, etc.

[0070] As an optional embodiment, in step (2), the concentration of the silver nitrate solution is 20-30 g / L, for example, it can be 20 g / L, 21 g / L, 22 g / L, 23 g / L, 24 g / L, 25 g / L, 26 g / L, 27 g / L, 28 g / L, 29 g / L, 30 g / L, etc.

[0071] As an optional embodiment, in step (2), the volume ratio of the composite cloth treated with PDA to the silver nitrate solution is (50-60) cm 2 : (90-120) mL, for example, 50 cm 2 :90mL、52cm 2 :93mL、54cm 2 :95mL、55cm 2 :100mL、56cm 2 :105mL、58cm 2 :110mL、60cm 2 :120mL, etc.

[0072] As an optional embodiment, in step (2), the temperature of the activation treatment is 25-35°C, for example, 25°C, 26°C, 27°C, 28°C, 29°C, 30°C, 31°C, 32°C, 33°C, 34°C, 35°C, etc.

[0073] As an optional embodiment, in step (2), the activation treatment time is 20 to 40 min, for example, it can be 20 min, 22 min, 24 min, 25 min, 26 min, 28 min, 30 min, 32 min, 34 min, 35 min, 36 min, 38 min, 40 min, etc.

[0074] As an optional embodiment, in step (3), the silver ammonia solution is prepared by the following steps:

[0075] Ammonia water is added dropwise to the silver nitrate solution, and the addition is continued after precipitation occurs until the solution becomes clear, thereby obtaining the silver ammonia solution.

[0076] As an optional embodiment, in step (3), the concentration of the silver nitrate solution is 25-35 g / L, for example, it can be 25 g / L, 26 g / L, 27 g / L, 28 g / L, 29 g / L, 30 g / L, 31 g / L, 32 g / L, 33 g / L, 34 g / L, 35 g / L, etc.

[0077] As an optional embodiment, in step (3), before adding the reducing agent, the temperature at which the activated composite cloth is immersed in the silver ammonia solution is 25-35°C, for example, 25°C, 26°C, 27°C, 28°C, 29°C, 30°C, 31°C, 32°C, 33°C, 34°C, 35°C, etc.

[0078] As an optional embodiment, in step (3), before adding the reducing agent, the activated composite cloth is immersed in the silver ammonia solution for 3 to 5 minutes, for example, 3 minutes, 3.5 minutes, 4 minutes, 4.5 minutes, 5 minutes, etc.

[0079] As an optional embodiment, in step (3), the reducing agent is glucose.

[0080] As an optional embodiment, in step (3), the mass ratio of the reducing agent to the silver nitrate used to prepare the silver ammonia solution is (0.9-1.2):1, for example, it can be 0.9:1, 0.95:1, 1:1, 1.05:1, 1.1:1, 1.15:1, 1.2:1, etc.

[0081] It should be noted that when adding the reducing agent, the weighed reducing agent is dissolved in 10 mL of deionized water and then slowly added to the silver ammonia solution. As an optional embodiment, in step (3), the power of the ultrasonic treatment is 100 to 160 W, for example, 100 W, 110 W, 120 W, 130 W, 140 W, 150 W, 160 W, etc.

[0082] As an optional embodiment, in step (3), the temperature of the ultrasonic treatment is 30-45°C, for example, it can be 30°C, 31°C, 32°C, 34°C, 35°C, 36°C, 38°C, 40°C, 41°C, 42°C, 44°C, 45°C, etc.

[0083] As an optional embodiment, in step (3), the ultrasonic treatment time is 3.5 to 5.5 min, for example, it can be 3.5 min, 4 min, 4.5 min, 5 min, 5.5 min, etc.

[0084] In a second aspect, the present invention provides an infrared stealth fabric, which is prepared by the preparation method described in the first aspect.

[0085] As an optional embodiment, the air permeability of the infrared stealth fabric is above 20mm / s, for example, it can be 20mm / s, 21mm / s, 22mm / s, 23mm / s, 24mm / s, 25mm / s, 26mm / s, 27mm / s, 28mm / s, 29mm / s, 30mm / s, 31mm / s, 32mm / s, 33mm / s, 34mm / s, 35mm / s, 36mm / s, 37mm / s, 38mm / s, 39mm / s, 40mm / s, 41mm / s, 42mm / s, etc., preferably above 22mm / s.

[0086] As an optional embodiment, the conductivity of the infrared stealth fabric is 45000 S·m -1 Above, for example, it can be 45000S·m -1 、46000S·m -1 、47000S·m -1 、48000S·m -1 、49000S·m -1 、50000S·m -1 、50200S·m -1 、50400S·m -1 、50600S·m -1 、50800S·m -1 、51000S·m -1 、51100S·m -1 、51200S·m -1 、51300S·m -1 、51400S·m -1 、51500S·m -1 、51600S·m -1 、51700S·m -1 、51800S·m -1 、51900S·m -1 、52000S·m -1 、52200S·m -1 、52400S·m -1 、56000S·m -1 、52800S·m -1 、53000S·m -1 、53100S·m -1 、53200S·m -1 etc., preferably 50000S·m -1 above.

[0087] As an optional embodiment, the emissivity of the infrared stealth fabric is 4-20%, for example, it can be 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, etc.

[0088] In a third aspect, the present invention provides a use of the infrared invisible fabric as described in the second aspect in the preparation of outdoor clothing.

[0089] As an optional embodiment, the outdoor clothing includes but is not limited to any one of a long-sleeved sweatshirt, a jacket or sportswear.

[0090] The present invention is further described below by means of specific examples and comparative examples. However, it should be understood that these examples are only used for more detailed description and should not be construed as limiting the present invention in any form.

[0091] Example 1

[0092] This embodiment provides an infrared stealth fabric, which is prepared by the following steps:

[0093] (1) Pretreatment:

[0094] 20g / m 2 The PA porous mesh (pore size 40-70 μm) was hot pressed at 140 ° C for 30 s to adhere to the nylon cloth (thickness 0.12-0.13 mm, density about 0.41 g / cm 3 , pore size of about 50 to 90 μm) on both sides to obtain PA / PA composite cloth; the PA / PA composite cloth was immersed in dopamine hydrochloride (2 g / L)-Tris sustained release solution (10 mM, pH 8.5), and treated in a 35°C water bath for 2 hours to obtain a PDA-treated composite cloth.

[0095] (2) Activation:

[0096] The PDA-treated composite fabric was immersed in AgNO 3 solution (25 g / L) for 30 min at 25 °C, and then washed with deionized water. 3 The solution can treat about 55cm 2 of the specimen.

[0097] (3) Chemical plating:

[0098] At 30 g / L AgNO 3 Add 25-28% NH 3 ·H 2O, continue to add dropwise until the solution is clear to obtain a silver ammonia solution; immerse the activated composite cloth in the solution at 25°C for 5 minutes; then add AgNO 3 An equal amount of glucose was added as a reducing agent to the silver ammonia solution, and ultrasonicated at a power of 100 W for 4 min at 25°C to obtain an infrared stealth fabric.

[0099] Figure 1 The spectral emissivity diagram of the infrared stealth fabric provided in this embodiment. Figure 1 As shown in the figure, the infrared stealth fabric has an emissivity of about 5% in the wavelength range of 7 to 14 μm. Compared with nylon fabric and PA / PA composite fabric, the mid-infrared emissivity has been significantly reduced.

[0100] Example 2

[0101] This embodiment provides an infrared stealth fabric, which is different from the embodiment 1 only in that, in step (1), the PA porous mesh has a gram weight of 15 g / m 2 The other steps are consistent with those in Example 1.

[0102] Example 3

[0103] This embodiment provides an infrared stealth fabric, which is different from the embodiment 1 only in that in step (1), the gram weight of the PA porous mesh is 25g / m 2 , the other steps are consistent with Example 1.

[0104] Example 4

[0105] This embodiment provides an infrared stealth fabric, which is different from Embodiment 1 only in that, in step (1), the concentration of dopamine hydrochloride in the dopamine hydrochloride buffer solution is 1 g / L, and the other steps are consistent with Embodiment 1.

[0106] Example 5

[0107] This embodiment provides an infrared stealth fabric, which is different from Embodiment 1 only in that, in step (1), the concentration of dopamine hydrochloride in the dopamine hydrochloride buffer solution is 3 g / L, and the other steps are consistent with Embodiment 1.

[0108] Example 6

[0109] This embodiment provides an infrared stealth fabric, which is different from Embodiment 1 only in that, in step (1), the fabric is treated in a water bath at 30° C. for 4 hours, and the other steps are consistent with Embodiment 1.

[0110] Example 7

[0111] This embodiment provides an infrared stealth fabric, which is different from Embodiment 1 only in that, in step (1), the fabric is treated in a water bath at 40° C. for 1 hour, and the other steps are consistent with Embodiment 1.

[0112] Example 8

[0113] This embodiment provides an infrared stealth fabric, which is different from Embodiment 1 only in that, in step (2), the concentration of the activation silver nitrate solution is 20 g / L, and the other steps are consistent with Embodiment 1.

[0114] Example 9

[0115] This embodiment provides an infrared stealth fabric, which is different from Embodiment 1 only in that, in step (2), the concentration of the activation silver nitrate solution is 30 g / L, and the other steps are consistent with Embodiment 1.

[0116] Example 10

[0117] This embodiment provides an infrared stealth fabric, which is different from Embodiment 1 only in that, in step (3), the concentration of the silver nitrate solution for chemical plating is 25 g / L, and the other steps are consistent with Embodiment 1.

[0118] Embodiment 11

[0119] This embodiment provides an infrared stealth fabric, which is different from Embodiment 1 only in that, in step (3), the concentration of the silver nitrate solution for chemical plating is 35 g / L, and the other steps are consistent with Embodiment 1.

[0120] Comparative Example 1

[0121] This comparative example provides a fabric, which is a nylon fabric (thickness of 0.12-0.13 mm, density of about 0.41 g / cm 3 , pore size is about 50 to 90 μm).

[0122] Comparative Example 2

[0123] This comparative example provides a fabric, which is a PA / PA composite fabric, and the PA / PA composite fabric is prepared by the following steps:

[0124] 20g / m 2 The PA porous mesh (pore size 40-70 μm) was hot pressed at 140 ° C for 30 s to adhere to the nylon cloth (thickness 0.12-0.13 mm, density about 0.41 g / cm 3 , pore size of about 50 to 90 μm) on both sides to obtain PA / PA composite fabric.

[0125] Comparative Example 3

[0126] This comparative example provides a fabric, which is different from Example 1 in that in step (1), the PA porous mesh is not adhered to both sides of the nylon cloth, but the thickness of the nylon cloth is increased to 0.38-0.39 mm, and the other steps are consistent with Example 1.

[0127] Comparative Example 4

[0128] This comparative example provides a fabric, which is different from Example 1 in that the activation treatment in step (2) is no longer performed, and the other steps are consistent with Example 1.

[0129] Comparative Example 5

[0130] This comparative example provides a fabric, which is different from Example 1 in that the chemical plating treatment in step (3) is no longer performed, and the other steps are consistent with Example 1.

[0131] Comparative Example 6

[0132] This embodiment provides an infrared stealth fabric, which is different from Embodiment 1 only in that, in step (3), the reducing agent is replaced by an equal amount of tartaric acid, and the other steps are consistent with Embodiment 1.

[0133] Test Case

[0134] Test samples: infrared stealth fabrics provided in Examples 1 to 11 and fabrics provided in Comparative Examples 1 to 6.

[0135] Test method:

[0136] (1) The infrared reflectivity (ρ) and infrared transmittance (τ) of different fabrics were tested using a Fourier transform infrared spectrometer with an integrating sphere, and the infrared emissivity (ε) of the samples was calculated using the following formula:

[0137] ε=I-ρ-τ

[0138] Based on the standard blackbody radiation intensity, the weighted average infrared emissivity of the experimental sample in the wavelength range of 7 to 14 μm can be calculated:

[0139]

[0140] Among them, I BB is the standard blackbody irradiance, K B is the Stefan-Boltzmann constant, h is the Planck constant, c is the speed of light in vacuum, and T is the measurement temperature 298K.

[0141] (2) Infrared thermal imaging of infrared stealth fabric covering human clothing.

[0142] (3) In an indoor environment with an ambient temperature of 26°C, the temperature of simulated skin covered with different fabrics was measured in real time within 0 to 40 minutes.

[0143] (4) Air permeability: According to ASTM D737, the air permeability of the samples was tested using an air permeability tester, and the pressure difference between the upper and lower surfaces of the fabric was set to 100 Pa to measure the air flow.

[0144] (5) Electrical conductivity: Use a circular cutter to cut the sample into a circle with a diameter of 12 mm. Use a four-probe tester to test the conductivity of the sample.

[0145] The test results are as follows Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown in Table 1, Table 2 and Table 3 below:

[0146] Table 1

[0147]

[0148]

[0149] Table 2

[0150]

[0151]

[0152] Table 3

[0153]

[0154]

[0155] As shown in Tables 1 to 3 above, the emissivity of the infrared stealth fabric prepared by the preparation method of the present invention can be reduced to 4 to 20%, and the simulated skin temperature is at least increased by 6°C. The air permeability of the infrared stealth fabric is above 20 mm / s, and the conductivity of the infrared stealth fabric is 45000 S·m -1 It is fully demonstrated that the infrared stealth fabric prepared by the present invention has the characteristics of low infrared emission, air permeability and high conductivity, can achieve outdoor infrared stealth, and compared with traditional nylon fabrics, can meet the comfort requirements of outdoor clothing, such as long-sleeved sweatshirts, jackets, sportswear, etc.

[0156] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing infrared stealth fabric, characterized in that: The preparation method of the infrared stealth fabric comprises the following steps: (1) adhering a porous mesh to both sides of a base fabric by hot pressing to obtain a composite fabric; immersing the composite fabric in a buffer solution of dopamine hydrochloride for pretreatment to obtain a PDA-treated composite fabric; (2) immersing the PDA-treated composite fabric in a silver nitrate solution for activation treatment to obtain an activated composite fabric; (3) Immersing the activated composite fabric in a silver ammonia solution, adding a reducing agent, and performing ultrasonic treatment to obtain an infrared stealth fabric.

2. The method for preparing the infrared stealth fabric according to claim 1, characterized in that: In step (1), the pore size of the porous mesh is 40 to 80 μm; the gram weight of the porous mesh is 15 to 25 g / m 2 ; Preferably, in step (1), the material of the porous mesh membrane includes any one of PA, PU, ​​PES, TPU, PE, PP, PET, PLA or PO or a combination of at least two thereof, preferably PA; Preferably, in step (1), the thickness of the base fabric is 0.1 to 0.15 mm; the density of the base fabric is 0.35 to 0.45 g / cm 3 , the pore size of the base fabric is 50 to 90 μm; Preferably, in step (1), the material of the base fabric includes any one of PA, PU, ​​PES, TPU, PE, PP, PET, PLA or PO or a combination of at least two thereof, preferably PA; Preferably, in step (1), the material of the porous mesh is the same as the material of the base fabric; Preferably, in step (1), the temperature of the hot pressing is 120 to 140° C., and the time of the hot pressing is 20 to 50 seconds.

3. The method for preparing the infrared stealth fabric according to claim 1, characterized in that: In step (1), the concentration of dopamine hydrochloride in the dopamine hydrochloride buffer solution is 1 to 5 g / L; Preferably, in step (1), the buffer solution is selected from Tris sustained-release solution; Preferably, the concentration of the Tris sustained-release solution is 10 to 30 mM; Preferably, in step (1), the pretreatment temperature is 30-40° C., and the pretreatment time is 1-3 h.

4. The method for preparing infrared stealth fabric according to claim 1, characterized in that: In step (2), the concentration of the silver nitrate solution is 20-30 g / L; Preferably, in step (2), the volume ratio of the area of ​​the composite cloth treated with PDA to the volume of the silver nitrate solution is (50-60) cm 2 :(90~120)mL; Preferably, in step (2), the temperature of the activation treatment is 25 to 35° C., and the time of the activation treatment is 20 to 40 minutes.

5. The method for preparing infrared stealth fabric according to claim 1, characterized in that: In step (3), the silver ammonia solution is prepared by the following steps: Adding ammonia water dropwise to the silver nitrate solution, and continuing to add dropwise after precipitation occurs until the solution becomes clear, thereby obtaining the silver ammonia solution; Preferably, in step (3), the concentration of the silver nitrate solution is 25-35 g / L.

6. The method for preparing infrared stealth fabric according to claim 1, characterized in that: In step (3), before adding the reducing agent, the temperature of the immersion in the silver ammonia solution is 25 to 35° C., and the immersion time is 3 to 5 minutes.

7. The method for preparing infrared stealth fabric according to claim 1, characterized in that: In step (3), the reducing agent is glucose; Preferably, in step (3), the mass ratio of the reducing agent to the silver nitrate used to prepare the silver ammonia solution is (0.9-1.2):1; Preferably, in step (3), the power of the ultrasonic treatment is 100-160 W, the temperature of the ultrasonic treatment is 30-45° C., and the time of the ultrasonic treatment is 3.5-5.5 min.

8. An infrared stealth fabric, characterized in that: The infrared stealth fabric is prepared by the preparation method according to any one of claims 1 to 7.

9. The infrared stealth fabric according to claim 8, characterized in that: The air permeability of the infrared stealth fabric is greater than 20 mm / s, preferably greater than 22 mm / s; Preferably, the conductivity of the infrared stealth fabric is 45000 S·m -1 Above, preferably 50000 S·m -1 above; Preferably, the emissivity of the infrared stealth fabric is 4-20%.

10. Use of the infrared invisible fabric according to claim 8 in preparing outdoor clothing.

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