Preparation method of infrared stealth fabric, infrared stealth fabric prepared by the method and application thereof

Abstract

The application provides a preparation method of infrared stealth fabric, the infrared stealth fabric prepared by the method and application, and relates to the field of wearable infrared stealth clothing. The preparation method of the infrared stealth fabric comprises the following steps: (1) a porous net film is adhered to both sides of a base cloth through hot pressing to obtain a composite cloth; the composite cloth is immersed in a buffer solution of dopamine hydrochloride for pretreatment to obtain a PDA-treated composite cloth; (2) the PDA-treated composite cloth is immersed in a silver nitrate solution for activation treatment to obtain an activated composite cloth; (3) the activated composite cloth is immersed in a silver ammine solution, and a reducing agent is added for ultrasonic treatment to obtain the infrared stealth fabric. The fabric prepared by the application has the characteristics of low infrared emission, air permeability and high conductivity, and can realize outdoor infrared stealth.

Description

Technical Field

[0001] This invention relates to the field of wearable infrared stealth clothing, specifically to a method for preparing an infrared stealth fabric, the infrared stealth fabric prepared therefrom, and its applications. Background Technology

[0002] Maintaining thermal comfort is fundamental to human physiological health in cold environments, and clothing plays a crucial role in effectively regulating body temperature. Traditional fabrics primarily achieve effective warmth by reducing heat conduction and convection. However, approximately 50% of the body's heat loss occurs through mid-infrared radiation. Traditional fabrics, with their high emissivity in the mid-infrared wavelength range (7–14 μm), cannot effectively suppress human thermal radiation. With the development of new textiles featuring high infrared reflectivity and low infrared emissivity, research on regulating the emissivity of fabrics in the mid-infrared band is increasing. These studies aim to suppress heat loss caused by human infrared radiation, thereby enhancing localized thermal radiation management and endowing fabrics with infrared stealth capabilities.

[0003] With the rapid development of infrared detection and imaging technologies, infrared detection technology is playing an increasingly important role in military warfare, leading to a high level of attention being paid to infrared stealth technology. According to the Stefan-Boltzmann law, the radiation capability of a target is determined by its emissivity and temperature. Therefore, the basic approach to achieving infrared stealth is to control the surface temperature of the target object to minimize the temperature difference between the detected target and its surrounding environment; and to control the surface emissivity of the target object to minimize the contrast in infrared radiation between the target and the background. However, the organic molecular and structural characteristics of ordinary textile materials result in high surface emissivity, making them difficult to evade detection and tracking by infrared detectors.

[0004] Based on this, researchers have used low-infrared emission materials to modify textiles using techniques such as impregnation, surface coating, and magnetron sputtering, developing various low-infrared emission textiles. However, existing research still faces some challenges, particularly regarding human comfort. Traditional fabrics have large pores, typically exhibiting good breathability. However, larger pores facilitate the penetration of infrared radiation, leading to higher mid-infrared emissivity. Existing low-infrared emission fabrics typically have pore sizes smaller than the wavelength of infrared radiation, thus hindering the transmission of mid-infrared radiation emitted by the human body. This results in a significant reduction in pore size and breathability during low-infrared emission modification. Furthermore, low-infrared emission materials used for fabric modification often possess electrical conductivity, imparting conductivity to the fabric. However, the pore size of the fabric also affects conductivity. Larger pore sizes lead to lower electron density, resulting in lower conductivity. This complex interaction creates a contradiction in polymer fabrics regarding the balance between low infrared emission, breathability, and conductivity.

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

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

[0007] The purpose of this invention is to provide a method for preparing infrared stealth fabric, the infrared stealth fabric prepared therefrom, and its applications. The infrared stealth fabric prepared by the method of this invention has advantages such as low infrared emission, breathability, and high conductivity.

[0008] In order to achieve the above-mentioned objectives of the present invention, the following technical solution is adopted:

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

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

[0011] (2) The PDA-treated composite fabric is immersed in silver nitrate solution for activation treatment to obtain the activated composite fabric;

[0012] (3) The activated composite fabric is immersed in silver ammonia solution, a reducing agent is added, and ultrasonic treatment is performed to obtain infrared stealth fabric.

[0013] Preferably, in step (1), the pore size of the porous membrane is 40–80 μm; the basis weight of the porous membrane is 15–25 g / m³. 2 .

[0014] Preferably, in step (1), the porous membrane is made of any one or a combination of at least two of PA, PU, ​​PES, TPU, PE, PP, PET, PLA or PO, with PA being the most preferred.

[0015] Preferably, in step (1), the thickness of the base fabric is 0.1–0.15 mm; and the density of the base fabric is 0.35–0.45 g / cm³. 3 The pore size of the base fabric is 50–90 μm.

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

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

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

[0019] Preferably, in step (1), the concentration of dopamine hydrochloride in the buffer solution of dopamine hydrochloride is 1-5 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 hours.

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

[0024] Preferably, in step (2), the area of ​​the PDA-treated composite fabric to the volume ratio of the silver nitrate solution is (50-60) cm². 2 :(90~120)mL.

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

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

[0027] Add ammonia to a silver nitrate solution dropwise. After a precipitate appears, continue adding ammonia until the solution becomes clear, thus 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 silver ammonia solution is 25-35°C and the immersion time is 3-5 min.

[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 100-160W, the temperature of the ultrasonic treatment is 30-45℃, and the time of the ultrasonic treatment is 3.5-5.5min.

[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 20 mm / s or higher, and more preferably 22 mm / s or higher.

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

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

[0037] Thirdly, the present invention provides an application of the infrared stealth 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 method for preparing infrared stealth fabric described in this invention has the advantages of simple and safe preparation process, short cycle and mild conditions, and the preparation process is passable.

[0040] (2) The infrared stealth fabric obtained by the preparation method described in this invention has significantly improved low infrared emission, breathability and conductivity, which can meet the comfort requirements of outdoor clothing. Attached Figure Description

[0041] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

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

[0043] Figure 2 Infrared thermal 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 The diagram shows the air permeability of the low infrared emission fabric provided in Example 1.

[0046] Figure 5 Conductivity diagram of the low infrared emission fabric provided in Example 1. Detailed Implementation

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

[0048] It should be noted that specific details are set forth in the following description to provide a full understanding of the invention. However, the invention can be practiced in many ways other than those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0049] The embodiments and examples of the present invention will be described in detail below. However, those skilled in the art will understand that the following embodiments and examples are for illustrative purposes only and should not be considered as limiting the scope of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention. Unless otherwise specified, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all commercially available conventional products.

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

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

[0052] (2) The PDA-treated composite fabric is immersed in silver nitrate solution for activation treatment to obtain the activated composite fabric;

[0053] (3) The activated composite fabric is immersed in silver ammonia solution, a reducing agent is added, and ultrasonic treatment is performed to obtain infrared stealth fabric.

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

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

[0056] As an optional implementation, in step (1), the basis weight of the porous membrane is 15-25 g / m³. 2 For example, it could 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 implementation, in step (1), the porous membrane is made of any one or a combination of at least two of PA, PU, ​​PES, TPU, PE, PP, PET, PLA or PO, preferably PA.

[0058] As an optional implementation, in step (1), the thickness of the base fabric is 0.1 to 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 implementation, in step (1), the density of the base fabric is 0.35–0.45 g / cm³. 3 For example, it could be 0.35 g / cm³. 3 0.36g / cm 3 0.38g / cm 3 0.4g / cm 3 0.42g / cm 3 0.44 g / cm 3 0.45g / cm 3 wait.

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

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

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

[0063] It should be noted that in order to improve the compatibility and bonding strength between the porous membrane and the substrate, it is preferable that both be made of the same material. For example, when the substrate is nylon fabric, the porous membrane is preferably a PA porous membrane.

[0064] As an optional implementation, 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 implementation, in step (1), the concentration of dopamine hydrochloride in the 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 implementation, in step (1), the buffer solution is selected from Tris sustained-release solution.

[0067] As an optional implementation, 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 implementation, in step (1), the pretreatment temperature is 30 to 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 implementation, in step (1), the pretreatment time is 1 to 3 hours, for example, it can be 1 hour, 1.2 hours, 1.4 hours, 1.5 hours, 1.6 hours, 1.8 hours, 2 hours, 2.2 hours, 2.4 hours, 2.5 hours, 2.6 hours, 2.8 hours, 3 hours, etc.

[0070] As an optional implementation, 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 implementation, in step (2), the area of ​​the PDA-treated composite fabric to the volume ratio of the silver nitrate solution is (50-60) cm². 2 (90~120)mL, for example, it could be 50cm 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 implementation, in step (2), the activation treatment temperature is 25 to 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 implementation, in step (2), the activation treatment time is 20 to 40 minutes, for example, it can be 20 minutes, 22 minutes, 24 minutes, 25 minutes, 26 minutes, 28 minutes, 30 minutes, 32 minutes, 34 minutes, 35 minutes, 36 minutes, 38 minutes, 40 minutes, etc.

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

[0075] Add ammonia to a silver nitrate solution dropwise. After a precipitate appears, continue adding ammonia until the solution becomes clear, thus obtaining the silver ammonia solution.

[0076] As an optional implementation, 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 implementation, in step (3), before adding the reducing agent, the temperature at which the activated composite fabric 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 implementation, in step (3), before adding the reducing agent, the time for which the activated composite fabric is immersed in silver ammonia solution is 3 to 5 minutes, for example, 3 minutes, 3.5 minutes, 4 minutes, 4.5 minutes, 5 minutes, etc.

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

[0080] As an optional implementation, in step (3), the mass ratio of the reducing agent to the silver nitrate used to prepare the silver ammonia solution is (0.9 to 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 should be dissolved in 10 mL of deionized water and then slowly added to the silver ammonia solution. As an optional implementation, in step (3), the power of the ultrasonic treatment is 100-160 W, for example, 100 W, 110 W, 120 W, 130 W, 140 W, 150 W, 160 W, etc.

[0082] As an optional implementation, in step (3), the temperature of the ultrasonic treatment is 30 to 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 implementation, in step (3), the time for ultrasonic treatment is 3.5 to 5.5 minutes, for example, 3.5 minutes, 4 minutes, 4.5 minutes, 5 minutes, 5.5 minutes, 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 implementation, the air permeability of the infrared stealth fabric is 20 mm / s or higher, for example, 20 mm / s, 21 mm / s, 22 mm / s, 23 mm / s, 24 mm / s, 25 mm / s, 26 mm / s, 27 mm / s, 28 mm / s, 29 mm / s, 30 mm / s, 31 mm / s, 32 mm / s, 33 mm / s, 34 mm / s, 35 mm / s, 36 mm / s, 37 mm / s, 38 mm / s, 39 mm / s, 40 mm / s, 41 mm / s, 42 mm / s, etc., preferably 22 mm / s or higher.

[0086] As an optional implementation, the infrared stealth fabric has a conductivity of 45000 S·m. -1 The above, for example, could be 45000 S·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 51400 S·m -1 51500S·m -1 51600 S·m -1 51700 S·m -1 51800 S·m -1 51900 S·m -1 52000S·m -1 52200S·m -1 52400 S·m -1 56000S·m -1 52800S·m -1 53000S·m -1 53100S·m -1 53200S·m -1 The preferred value is 50000 S·m. -1 above.

[0087] As an optional implementation, the emissivity of the infrared stealth fabric is 4% to 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] Thirdly, the present invention provides an application of the infrared stealth fabric as described in the second aspect in the preparation of outdoor clothing.

[0089] As an optional implementation, the outdoor clothing includes, but is not limited to, any one of long-sleeved sweatshirts, jackets, or sportswear.

[0090] The present invention will be further illustrated below with specific embodiments and comparative examples. However, it should be understood that these embodiments are merely for the purpose of more detailed illustration and should not be construed as limiting the present invention in any way.

[0091] Example 1

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

[0093] (1) Preprocessing:

[0094] 20g / m 2 PA porous membrane (pore size 40-70 μm) was hot-pressed at 140℃ for 30 seconds to adhere it to nylon cloth (thickness 0.12-0.13 mm, density approximately 0.41 g / cm³). 3 PA / PA composite fabric was obtained by immersing the PA / PA composite fabric in a dopamine hydrochloride (2g / L)-Tris sustained-release solution (10mM, pH 8.5) on both sides of the surface with a pore size of approximately 50-90μm. The PA / PA composite fabric was then immersed in a water bath at 35℃ for 2 hours to obtain a PDA-treated composite fabric.

[0095] (2) Activation:

[0096] The PDA-treated composite fabric was immersed in AgNO3 solution (25 g / L) for 30 minutes at 25°C, and then rinsed with deionized water. Approximately 55 cm of fabric can be treated with 100 mL of AgNO3 solution. 2 The sample.

[0097] (3) Chemical plating:

[0098] Add 25-28% NH3·H2O dropwise to a 30 g / L AgNO3 solution. After precipitation occurs, continue adding NH3·H2O until the solution becomes clear to obtain a silver ammonia solution. Immerse the activated composite fabric in the solution at 25°C for 5 minutes. Then add glucose in an equal amount as a reducing agent to the silver ammonia solution and sonicate at 100 W for 4 minutes 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 is shown. Figure 1 As shown, the emissivity of the infrared stealth fabric is approximately 5% in the wavelength range of 7–14 μm. Compared to nylon fabric and PA / PA composite fabric, the mid-infrared emissivity is significantly reduced.

[0100] Example 2

[0101] This embodiment provides an infrared stealth fabric, which differs from Embodiment 1 only in that, in step (1), the basis weight of the PA porous mesh is 15 g / m². 2 The other steps are the same as in Example 1.

[0102] Example 3

[0103] This embodiment provides an infrared stealth fabric, which differs from Embodiment 1 only in that, in step (1), the basis weight of the PA porous mesh is 25 g / m². 2 The other steps are the same as in Example 1.

[0104] Example 4

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

[0106] Example 5

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

[0108] Example 6

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

[0110] Example 7

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

[0112] Example 8

[0113] This embodiment provides an infrared stealth fabric. The only difference from Embodiment 1 is that in step (2), the concentration of the silver nitrate solution for activation is 20 g / L. The other steps are the same as in Embodiment 1.

[0114] Example 9

[0115] This embodiment provides an infrared stealth fabric. The only difference from Embodiment 1 is that in step (2), the concentration of the silver nitrate solution for activation is 30 g / L. The other steps are the same as in Embodiment 1.

[0116] Example 10

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

[0118] Example 11

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

[0120] Comparative Example 1

[0121] This comparative example provides a fabric, which is nylon cloth (thickness 0.12-0.13 mm, density approximately 0.41 g / cm³). 3 (Aperture size approximately 50–90 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 PA porous membrane (pore size 40-70 μm) was hot-pressed at 140℃ for 30 seconds to adhere it to nylon cloth (thickness 0.12-0.13 mm, density approximately 0.41 g / cm³). 3 PA / PA composite fabric is obtained by sizing both sides of the pores (approximately 50–90 μm in diameter).

[0125] Comparative Example 3

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

[0127] Comparative Example 4

[0128] This comparative example provides a fabric that differs from Example 1 in that the activation treatment in step (2) is no longer performed, while the other steps are the same as in Example 1.

[0129] Comparative Example 5

[0130] This comparative example provides a fabric that differs from Example 1 in that the chemical plating treatment in step (3) is no longer performed, while the other steps are the same as in Example 1.

[0131] Comparative Example 6

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

[0133] Test case

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

[0135] Test method:

[0136] (1) The infrared reflectance (ρ) and infrared transmittance (τ) of different fabrics were measured 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 7–14 μm can be calculated:

[0139]

[0140] Among them, I BB K represents the standard blackbody irradiance. 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 of 298 K.

[0141] (2) Infrared thermal image 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 sample was tested using an air permeability tester. The pressure difference between the upper and lower surfaces of the fabric was set to 100 Pa to measure the airflow.

[0144] (5) Conductivity: The sample was cut into a circle with a diameter of 12 mm using a circular cutter. The conductivity of the sample was tested using a four-probe tester.

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

[0146] Table 1

[0147]

[0148]

[0149] Table 2

[0150]

[0151]

[0152] Table 3

[0153]

[0154]

[0155] As shown in Tables 1-3 above, the emissivity of the infrared stealth fabric prepared by the method described in this invention can be reduced to 4-20%, increasing the simulated skin temperature by at least 6°C. Furthermore, 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 The above fully demonstrates that the infrared stealth fabric prepared by this invention has the characteristics of low infrared emission, breathability, and high conductivity, enabling outdoor infrared stealth. Compared with traditional nylon fabrics, it can meet the comfort requirements of outdoor clothing, such as long-sleeved sweatshirts, jackets, and sportswear.

[0156] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions 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 an infrared stealth fabric, characterized in that, The method for preparing the infrared stealth fabric includes the following steps: (1) The porous mesh is adhered to both sides of the base fabric by hot pressing to obtain a composite fabric; the composite fabric is immersed in a buffer solution of dopamine hydrochloride for pretreatment to obtain a PDA-treated composite fabric. The porous membrane has a pore size of 40-80 μm and a basis weight of 15-25 g / m³. 2 The thickness of the base fabric is 0.1~0.15 mm; the density of the base fabric is 0.35~0.45 g / cm³. 3 The pore size of the base fabric is 50~90 μm; the pretreatment temperature is 30~40℃; and the pretreatment time is 1~3 h. (2) The PDA-treated composite fabric is immersed in silver nitrate solution for activation treatment to obtain the activated composite fabric; The concentration of the silver nitrate solution is 20-30 g / L; the area ratio of the PDA-treated composite fabric to the volume ratio of the silver nitrate solution is (50-60) cm². 2 (90~120) mL; the activation treatment temperature is 25~35℃, and the activation treatment time is 20~40 min; (3) The activated composite fabric is immersed in silver ammonia solution, a reducing agent is added, and ultrasonic treatment is performed to obtain infrared stealth fabric; Before adding the reducing agent, the temperature of the silver ammonia solution is 25~35℃ and the immersion time is 3~5 min; the power of the ultrasonic treatment is 100~160 W, the temperature of the ultrasonic treatment is 30~45℃, and the time of the ultrasonic treatment is 3.5~5.5 min.

2. The method for preparing infrared stealth fabric according to claim 1, characterized in that, In step (1), the porous membrane is made of any one or a combination of at least two of PA, PU, ​​PES, TPU, PE, PP, PET, PLA or PO.

3. The method for preparing infrared stealth fabric according to claim 2, characterized in that, In step (1), the porous membrane is made of PA.

4. The method for preparing infrared stealth fabric according to claim 1, characterized in that, In step (1), the material of the base fabric includes any one or a combination of at least two of PA, PU, ​​PES, TPU, PE, PP, PET, PLA or PO.

5. The method for preparing infrared stealth fabric according to claim 4, characterized in that, In step (1), the base fabric is made of PA.

6. The method for preparing infrared stealth fabric according to claim 1, characterized in that, In step (1), the porous mesh is made of the same material as the base fabric.

7. The method for preparing the infrared stealth fabric according to claim 1, characterized in that, In step (1), the hot pressing temperature is 120~140℃ and the hot pressing time is 20~50 s.

8. 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 buffer solution of dopamine hydrochloride is 1~5 g / L.

9. The method for preparing infrared stealth fabric according to claim 1, characterized in that, In step (1), the buffer solution is selected from Tris sustained-release solution.

10. The method for preparing the infrared stealth fabric according to claim 9, characterized in that, The concentration of the Tris sustained-release solution is 10~30 mM.

11. 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: Add ammonia to a silver nitrate solution dropwise. After a precipitate appears, continue adding ammonia until the solution becomes clear, thus obtaining the silver ammonia solution.

12. The method for preparing the infrared stealth fabric according to claim 11, characterized in that, The concentration of the silver nitrate solution is 25~35 g / L.

13. The method for preparing infrared stealth fabric according to claim 1, characterized in that, In step (3), the reducing agent is glucose.

14. The method for preparing infrared stealth fabric according to claim 1, characterized in that, 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.

15. An infrared stealth fabric, characterized in that, The infrared stealth fabric is prepared by the preparation method as described in any one of claims 1 to 14.

16. The infrared stealth fabric according to claim 15, characterized in that, The infrared stealth fabric has an air permeability of 20 mm / s or higher.

17. The infrared stealth fabric according to claim 16, characterized in that, The infrared stealth fabric has an air permeability of 22 mm / s or higher.

18. The infrared stealth fabric according to claim 15, characterized in that, The conductivity of the infrared stealth fabric is 45000 S·m. -1 above.

19. The infrared stealth fabric according to claim 18, characterized in that, The infrared stealth fabric has a conductivity of 50,000 S·m. -1 above.

20. The infrared stealth fabric according to claim 15, characterized in that, The emissivity of the infrared stealth fabric is 4-20%.

21. The application of an infrared stealth fabric according to any one of claims 15 to 20 in the preparation of outdoor clothing.

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