Braid for preventing multiband reconnaissance and preparation method thereof

Abstract

The invention discloses an anti-multiband reconnaissance braid and a preparation method thereof, and relates to the technical field of braids, the anti-multiband reconnaissance braid comprises a fiber base material, and a middle and far infrared camouflage coating and an optical camouflage coating which are sequentially coated, cured and formed; a transition layer is formed between the middle and far infrared camouflage coating and the optical camouflage coating; the transition layer is formed by depositing transition slurry on the surface of the pre-crosslinked middle and far infrared camouflage coating in situ; the transition slurry is prepared from the following components in parts by weight: 80 to 85 parts of an end group modified waterborne PU-PA block copolymer, 1.8 to 2 parts of nano-hydroxyapatite, 2.7 to 3 parts of a waterborne epoxy curing agent, 0.7 to 0.8 part of a nonionic wetting dispersant and 9 to 9.2 parts of deionized water. The fiber base material, the middle and far infrared camouflage coating, the transition layer and the optical camouflage coating form a four-layer structure, the anti-reconnaissance effect in visible light and middle and far infrared bands is achieved, and meanwhile the interlayer binding force, flexibility and durability are effectively improved.

Description

Technical Field

[0001] This application relates to the field of webbing technology, and in particular to a webbing for preventing multi-band reconnaissance and its preparation method. Background Technology

[0002] Ribbons are narrow-width or tubular fabrics made from various yarns.

[0003] Webbing used in military equipment and individual soldier gear is mostly conventionally dyed or in ordinary camouflage patterns. It has poor camouflage effect in the visible light band and suffers from problems such as mismatch in the near-infrared (NIR) band, lack of thermal infrared (TIR) ​​camouflage capability, contradiction between function and durability, and poor compatibility with existing processes.

[0004] Regarding the mismatch in the near-infrared (NIR) band, the spectral reflectance characteristics of ordinary dyes in the near-infrared (700-1200nm) band differ significantly from natural backgrounds (such as vegetation, soil, and snow), resulting in clearly visible target outlines under near-infrared reconnaissance equipment such as night vision devices, thus rendering camouflage ineffective. Regarding the lack of thermal infrared (TIR) ​​camouflage capabilities, the high emissivity of conventional webbing materials (typically above 0.8) creates a strong contrast between their thermal radiation signals and the surrounding environment, making them easily detectable and identifiable by infrared thermal imagers. This highlights the inability to solve the problem of thermal infrared camouflage solely through the fabric itself. Regarding the conflict between functionality and durability, using simple coatings or films to impart infrared camouflage to webbing often leads to hardening, brittleness, reduced air permeability, and deterioration of abrasion and flexural strength, failing to meet the high flexibility and abrasion resistance requirements of webbing in demanding applications. Regarding poor compatibility with existing processes, many special camouflage coatings require complex equipment or demanding process conditions (such as high-temperature sintering and vacuum coating), making it difficult to achieve large-scale and economical production on existing tooling equipment for ribbon production (such as dyeing, finishing, coating, and setting equipment).

[0005] It is evident that existing webbing has poor camouflage effects in the visible light band, which prevents the effective synergy between functional performance and product flexibility and durability, thus limiting the scope of application and large-scale production of webbing, and thus requires improvement. Summary of the Invention

[0006] In view of this, the first objective of this application is to provide a multi-band reconnaissance protection webbing to improve flexibility, durability, and functionality. The specific solution is as follows: A multi-band reconnaissance protection webbing includes a fiber substrate and a mid- and far-infrared camouflage coating and an optical camouflage coating that are sequentially coated and cured. A transition layer is formed between the mid- and far-infrared camouflage coating and the optical camouflage coating; The transition layer is formed by in-situ deposition of a transition slurry onto the surface of the pre-crosslinked mid- and far-infrared camouflage coating; The transition slurry comprises 80-85 parts by weight of end-modified waterborne PU-PA block copolymer, 1.8-2 parts by weight of nano-hydroxyapatite, 2.7-3 parts by weight of waterborne epoxy curing agent, 0.7-0.8 parts by weight of nonionic wetting and dispersing agent, and 9-9.2 parts by weight of deionized water.

[0007] Preferably, the end-group modified waterborne PU-PA block copolymer has a solid content of 38-42% and contains 15-18 wt% polysiloxane segments; the nano-hydroxyapatite has a hydroxyl content of not less than 3.2 mmol / g; the waterborne epoxy curing agent is a polyamide amine type curing agent; and the nonionic wetting and dispersing agent is polyoxyethylene ether.

[0008] Preferably, the preparation method of the transition slurry includes: Step ① stirring the end-group modified waterborne PU-PA block copolymer, controlling the stirring speed at 280-300 r / min, the stirring temperature at 23-27℃, and the stirring time at 14-16 min to obtain a dispersed copolymer slurry; Step ② adding nano-hydroxyapatite to the dispersed copolymer slurry and heating it to 38-40℃, controlling the stirring speed at 750-800 r / min, and dispersing it for 28-30 min to obtain a mixed dispersion slurry; Step ③ sequentially adding waterborne epoxy curing agent and nonionic wetting and dispersing agent to the mixed dispersion slurry and cooling it to 28-30℃, controlling the stirring speed at 280-300 r / min and stirring for 18-20 min, and then adding deionized water to obtain a pretreated transition slurry with a viscosity of 45-55 mPa·s; Step ④ grinding the pretreated transition slurry to obtain a transition slurry.

[0009] Preferably, the mid- and far-infrared camouflage coating is formed by coating and curing a mid- and far-infrared slurry; the mid- and far-infrared slurry comprises 50-55 parts by weight of waterborne polyurethane adhesive, 23-25 ​​parts by weight of multi-walled carbon nanotube-silver powder core filler, 4.8-5.2 parts by weight of polyimide flexible toughening agent, 0.5-0.55 parts by weight of wetting and dispersing agent, 0.3-0.32 parts by weight of leveling agent, and 19-19.5 parts by weight of deionized water.

[0010] Preferably, the solid content of the waterborne polyurethane adhesive is 35-38%, and the solid content of the polyimide flexible toughening agent is 40-42%. The preparation method of the multi-walled carbon nanotube-silver powder core-shell filler includes mixing 68-70 parts by weight of silver powder, 9-10 parts by weight of multi-walled carbon nanotubes, and 50-52 parts by weight of anhydrous ethanol, dispersing the mixture evenly by ultrasonication, introducing argon gas, and performing plasma treatment. The plasma treatment power is controlled at 70-80W, the vacuum degree is 0.05-0.08MPa, and the treatment time is 10-11min. Then, 14-16 parts by weight of polyethylene glycol and 2.8-3 parts by weight of silane coupling agent are added, and the mixture is stirred and reacted at a controlled temperature of 58-60℃ for 2-2.2h. After centrifugation and vacuum drying, the multi-walled carbon nanotube-silver powder core-shell filler is obtained.

[0011] Preferably, the mid- and far-infrared slurry is obtained by mixing and dispersing water-based polyurethane adhesive, multi-walled carbon nanotube-silver powder core filler, polyimide flexible toughening agent, wetting and dispersing agent, leveling agent and deionized water, and adjusting the viscosity to 70-90 mPa·s and the fineness to no more than 15 μm.

[0012] Preferably, the optical camouflage coating is formed by coating and curing an optical slurry; the optical slurry comprises 50-55 parts by weight of an acrylate copolymer binder, 18-20 parts by weight of SiO2-TiO2-coated rare earth doped modified pigments, 2.8-3 parts by weight of a multi-walled carbon nanotube-silver powder core filler, 0.19-0.21 parts by weight of a thickener, 0.28-0.32 parts by weight of a defoamer, and 21-22 parts by weight of deionized water.

[0013] Preferably, the solid content of the acrylate copolymer adhesive is 38-40%, the thickener is hydroxyethyl cellulose, and the defoamer is an organosilicon defoamer. The preparation method of the SiO2-TiO2 coated rare earth doped modified pigment includes mixing and dispersing 78-82 parts by weight of near-infrared reflective pigment with 100 parts by weight of ethanol aqueous solution to form a suspension, then adding 9.5-10 parts by weight of tetraethyl orthosilicate and 4.8-5.2 parts by weight of tetrabutyl titanate, controlling the dropping rate at 0.46-0.5 mL / min, stirring at a controlled temperature of 28-32℃ until the dropping is complete, adjusting the pH to 8.5-9 with ammonia water, adding 0.5-0.52 parts by weight of europium nitrate and continuing to stir the reaction for 3-3.5 h, and finally filtering, washing to neutral, vacuum drying and calcining to obtain the SiO2-TiO2 coated rare earth doped modified pigment.

[0014] The second objective of this invention is to provide a method for preparing an anti-multi-band reconnaissance webbing, which includes the following steps: Step 1: Take the fiber substrate and perform etching and activation treatment to obtain activated webbing substrate; Step 2: Coat the surface of the activated webbing substrate with a mid- to far-infrared paste, and control the temperature at 80-90℃ for 2.5-3 minutes to obtain a webbing blank with a mid- to far-infrared prepolymer layer with a crosslinking degree of 30%. Step 3: Electrospinning in-situ deposit a transition layer on the surface of the mid-far-infrared prepolymer layer of the ribbon preform. Control the voltage of the electrospinning in-situ deposition to be 16-20V and the spraying rate to be 0.295-0.305mL / h to obtain a transition layer with a thickness of 50-100nm and a fiber diameter of 200-500nm. Then, perform microwave crosslinking treatment to control the crosslinking degree between the transition layer and the mid-far-infrared prepolymer layer to increase to 70% to obtain crosslinked ribbon. Step 4: Coat the transition layer surface of the cross-linked webbing with optical paste, cure it with ultraviolet light, and then finish it to obtain the finished anti-multi-band reconnaissance webbing.

[0015] Preferably, the etching activation treatment includes taking a polyester / cotton webbing substrate and subjecting it to vacuum plasma treatment to obtain an etched webbing substrate with 1-3 μm grooves formed on the surface, then immersing the etched webbing substrate in a composite solution and subjecting it to constant temperature oscillation treatment at 30-35℃ for 30-35 min, and then taking it out and drying it. The composite solution is composed of deionized water, nano-calcium carbonate and silane coupling agent in a mass ratio of 100-110:5-5.5:0.95-1.

[0016] As can be seen from the above solutions, this application provides a multi-band reconnaissance protection webbing and its manufacturing method, which has the following beneficial effects: 1. By assembling a four-layer structure consisting of a fiber substrate, a mid- and far-infrared camouflage coating, a transition layer, and an optical camouflage coating, the anti-reconnaissance effect is achieved in the visible light and mid- and far-infrared bands, while simultaneously improving interlayer bonding, flexibility, and durability. 2. By using end-modified waterborne PU-PA block copolymer and nano-hydroxyapatite as core components to form a transition slurry, which is then deposited in situ and bonded to a pre-crosslinked substrate, a stable chemical bond and molecular interpenetrating structure is formed, thereby significantly improving the interlayer bonding force, avoiding coating peeling, and enhancing the stability of the anti-multi-band reconnaissance webbing structure. 3. By preparing multi-walled carbon nanotube-silver powder core-shell filler, it is possible to synergistically reduce the overall mid- and far-infrared emissivity, achieve the effect of matching and synergistic optical camouflage and thermal infrared camouflage, and thus improve the synergistic effect of multi-band anti-reconnaissance. 4. By preparing SiO2-TiO2-coated rare earth-doped modified pigments, the water resistance and UV aging resistance of the near-infrared reflective pigments in the anti-multi-band reconnaissance webbing are significantly improved. Through the strong near-infrared band reflectivity of europium ions, the optical camouflage coating presents a corresponding camouflage color in the visible light region and highly matches the near-infrared spectrum of the natural background, thereby achieving the purpose of significantly enhancing the optical reconnaissance evasion effect. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the anti-multi-band reconnaissance webbing disclosed in this application.

[0019] Explanation of reference numerals in the attached figures: 1. Fiber substrate; 2. Mid- to far-infrared camouflage coating; 3. Optical camouflage coating. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] It should be noted that in the embodiments of this application, the plasma treatment for etching activation is performed with a vacuum level of 0.03 MPa, a power of 100 W, and a time of 8 min. The gas used is a mixture of argon and oxygen with a volume ratio of 3:1, and the flow rate of the mixed gas is controlled at 15 sccm. In the plasma treatment of multi-walled carbon nanotubes-silver powder core-filler, argon is used, and the flow rate is 20 sccm. Meanwhile, the post-treatment in these embodiments involves the use of functional finishing solutions. These functional finishing solutions are all commercially available, and the treatment method uses conventional processes, which will not be elaborated upon here.

[0022] The following will provide a detailed description of a multi-band reconnaissance protection webbing and its preparation method, based on this application.

[0023] like Figure 1As shown, a multi-band reconnaissance camouflage webbing includes a fiber substrate and a mid- to far-infrared camouflage coating and an optical camouflage coating sequentially coated and cured. Simultaneously, a transition layer is formed between the mid- to far-infrared camouflage coating and the optical camouflage coating. The transition layer is formed by in-situ deposition of a transition slurry onto the surface of the pre-crosslinked mid- to far-infrared camouflage coating.

[0024] The transition slurry comprises 80-85 parts by weight of end-modified waterborne PU-PA block copolymer, 1.8-2 parts by weight of nano-hydroxyapatite, 2.7-3 parts by weight of waterborne epoxy curing agent, 0.7-0.8 parts by weight of nonionic wetting and dispersing agent, and 9-9.2 parts by weight of deionized water. In the transition slurry, the solid content of the end-modified waterborne PU-PA block copolymer is 38-42%, and it contains 15-18 wt% polysiloxane segments. The hydroxyl content of the nano-hydroxyapatite is not less than 3.2 mmol / g. The waterborne epoxy curing agent is a polyamide amine type curing agent. The nonionic wetting and dispersing agent is polyoxyethylene ether.

[0025] It should be noted that the preparation method of the transition slurry includes the following steps: Step ① Stirring the end-group modified waterborne PU-PA block copolymer, controlling the stirring speed at 280-300 r / min, the stirring temperature at 23-27℃, and the stirring time at 14-16 min to obtain a dispersed copolymer slurry; Step ② Adding nano-hydroxyapatite to the dispersed copolymer slurry and heating it to 38-40℃, controlling the stirring speed at 750-800 r / min, and dispersing it for 28-30 min to obtain a mixed dispersion slurry; Step ③ Adding waterborne epoxy curing agent and nonionic wetting and dispersing agent sequentially to the mixed dispersion slurry and cooling it to 28-30℃, controlling the stirring speed at 280-300 r / min and stirring for 18-20 min, and then adding deionized water to obtain a pretreated transition slurry with a viscosity of 45-55 mPa·s; Step ④ Grinding the pretreated transition slurry to obtain the transition slurry.

[0026] Meanwhile, the mid-to-far-infrared camouflage coating is formed by coating and curing a mid-to-far-infrared slurry. The mid-to-far-infrared slurry comprises 50-55 parts by weight of waterborne polyurethane binder, 23-25 ​​parts by weight of multi-walled carbon nanotube-silver powder core filler, 4.8-5.2 parts by weight of polyimide flexible toughening agent, 0.5-0.55 parts by weight of wetting and dispersing agent, 0.3-0.32 parts by weight of leveling agent, and 19-19.5 parts by weight of deionized water. The solid content of the waterborne polyurethane binder is 35-38%, and the solid content of the polyimide flexible toughening agent is 40-42%. The preparation method of multi-walled carbon nanotube-silver powder core-shell filler includes mixing 68-70 parts by weight of silver powder, 9-10 parts by weight of multi-walled carbon nanotubes and 50-52 parts by weight of anhydrous ethanol, dispersing the mixture evenly by ultrasonication, introducing argon gas and performing plasma treatment, controlling the plasma treatment power to be 70-80W, the vacuum degree to be 0.05-0.08MPa, and the treatment time to be 10-11min, then adding 14-16 parts by weight of polyethylene glycol and 2.8-3 parts by weight of silane coupling agent, and stirring the reaction at a controlled temperature of 58-60℃ for 2-2.2h, and then centrifuging and vacuum drying to obtain the multi-walled carbon nanotube-silver powder core-shell filler. The mid- and far-infrared slurry is obtained by mixing and dispersing water-based polyurethane adhesive, multi-walled carbon nanotube-silver powder core filler, polyimide flexible toughening agent, wetting and dispersing agent, leveling agent and deionized water in corresponding weight parts, and then adjusting the viscosity to 70-90 mPa·s and the fineness to no more than 15 μm.

[0027] In this embodiment, the optical camouflage coating is formed by coating and curing an optical paste. The optical paste comprises 50-55 parts by weight of an acrylate copolymer binder, 18-20 parts by weight of SiO2-TiO2-coated rare earth-doped modified pigments, 2.8-3 parts by weight of a multi-walled carbon nanotube-silver powder core filler, 0.19-0.21 parts by weight of a thickener, 0.28-0.32 parts by weight of a defoamer, and 21-22 parts by weight of deionized water. The acrylate copolymer binder has a solid content of 38-40%. The thickener is hydroxyethyl cellulose. The defoamer is an organosilicon defoamer. The preparation method of SiO2-TiO2 coated rare earth doped modified pigment includes mixing and dispersing 78-82 parts by weight of near-infrared reflective pigment with 100 parts by weight of ethanol aqueous solution to form a suspension, then adding 9.5-10 parts by weight of tetraethyl orthosilicate and 4.8-5.2 parts by weight of tetrabutyl titanate, controlling the dropping rate at 0.46-0.5 mL / min, stirring at a controlled temperature of 28-32℃ until the dropping is complete, adjusting the pH to 8.5-9 with ammonia water, adding 0.5-0.52 parts by weight of europium nitrate and continuing to stir the reaction for 3-3.5 h, and finally filtering, washing to neutral, vacuum drying and calcining to obtain SiO2-TiO2 coated rare earth doped modified pigment. The optical paste is obtained by mixing and dispersing appropriate weight parts of acrylate copolymer binder, SiO2-TiO2 coated rare earth doped modified pigment, multi-walled carbon nanotube-silver powder core filler, thickener, defoamer and deionized water, and then adjusting the viscosity to 55-65 mPa·s and the fineness to no more than 10 μm.

[0028] A method for preparing an anti-multi-band reconnaissance webbing, used to prepare the anti-multi-band reconnaissance webbing as described above, includes the following steps: Step 1: Take the fiber substrate and perform etching activation treatment. The etching activation treatment includes taking the polyester / cotton webbing substrate and performing vacuum plasma treatment to obtain an etched webbing substrate with 1-3μm grooves on the surface. Then, immerse the etched webbing substrate in a composite solution and perform constant temperature oscillation treatment at 30-35℃ for 30-35 minutes, and then take it out and dry it. The composite solution is composed of deionized water, nano calcium carbonate and silane coupling agent in a mass ratio of 100-110:5-5.5:0.95-1 to obtain an activated webbing substrate. Step 2: Coat the surface of the activated webbing substrate with a mid- to far-infrared paste, and control the temperature at 80-90℃ for 2.5-3 minutes to obtain a webbing blank with a mid- to far-infrared prepolymer layer with a crosslinking degree of 30%. Step 3: Electrospinning in-situ deposit a transition layer on the surface of the mid-far-infrared prepolymer layer of the ribbon preform. Control the voltage of the electrospinning in-situ deposition to be 16-20V and the spraying rate to be 0.295-0.305mL / h to obtain a transition layer with a thickness of 50-100nm and a fiber diameter of 200-500nm. Then, perform microwave crosslinking treatment to control the crosslinking degree between the transition layer and the mid-far-infrared prepolymer layer to increase to 70% to obtain crosslinked ribbon. Step 4: Coat the transition layer surface of the cross-linked webbing with optical paste, cure it with ultraviolet light, and then finish it to obtain the finished anti-multi-band reconnaissance webbing.

[0029] Example 1

[0030] like Figure 1 As shown, a multi-band reconnaissance camouflage webbing includes a fiber substrate and a mid- to far-infrared camouflage coating and an optical camouflage coating sequentially coated and cured. Simultaneously, a transition layer is formed between the mid- to far-infrared camouflage coating and the optical camouflage coating. The transition layer is formed by in-situ deposition of a transition slurry onto the surface of the pre-crosslinked mid- to far-infrared camouflage coating.

[0031] The transition slurry comprises 80 parts by weight of end-modified waterborne PU-PA block copolymer, 1.8 parts by weight of nano-hydroxyapatite, 2.7 parts by weight of waterborne epoxy curing agent, 0.7 parts by weight of nonionic wetting and dispersing agent, and 9 parts by weight of deionized water. In the transition slurry, the end-modified waterborne PU-PA block copolymer has a solid content of 38% and contains 15.3 wt% polysiloxane segments. The waterborne epoxy curing agent is a polyamide-amine type curing agent. The nonionic wetting and dispersing agent is polyoxyethylene ether.

[0032] It should be noted that the preparation method of the transition slurry includes the following steps: Step ① Stirring the end-group modified waterborne PU-PA block copolymer, controlling the stirring speed at 280 r / min, the stirring temperature at 23℃, and the stirring time at 16 min to obtain a dispersed copolymer slurry; Step ② Adding nano-hydroxyapatite to the dispersed copolymer slurry and heating it to 38℃, controlling the stirring speed at 750 r / min, and dispersing it for 30 min to obtain a mixed dispersion slurry; Step ③ Adding waterborne epoxy curing agent and nonionic wetting and dispersing agent sequentially to the mixed dispersion slurry and cooling it to 28℃, controlling the stirring speed at 280 r / min and stirring for 20 min, and then adding deionized water to obtain a pretreated transition slurry with a viscosity of 45 mPa·s; Step ④ Grinding the pretreated transition slurry to obtain the transition slurry.

[0033] Meanwhile, the mid-to-far-infrared camouflage coating is formed by coating and curing a mid-to-far-infrared slurry. The mid-to-far-infrared slurry comprises 50 parts by weight of waterborne polyurethane binder, 23 parts by weight of multi-walled carbon nanotube-silver powder core filler, 4.8 parts by weight of polyimide flexible toughening agent, 0.5 parts by weight of wetting and dispersing agent, 0.3 parts by weight of leveling agent, and 19 parts by weight of deionized water. The solid content of the waterborne polyurethane binder is 35%, and the solid content of the polyimide flexible toughening agent is 40%. The preparation method of multi-walled carbon nanotube-silver powder core-shell filler includes mixing 68 parts by weight of silver powder, 9 parts by weight of multi-walled carbon nanotubes, and 50 parts by weight of anhydrous ethanol. After ultrasonic dispersion, argon gas is introduced and plasma treatment is performed. The plasma treatment power is controlled at 70W, the vacuum degree is 0.05MPa, and the treatment time is 10min. Then, 14 parts by weight of polyethylene glycol and 2.8 parts by weight of silane coupling agent are added, and the reaction is carried out at a controlled temperature of 58℃ with stirring for 2.2h. After centrifugation and vacuum drying, multi-walled carbon nanotube-silver powder core-shell filler is obtained. The mid- and far-infrared slurry is prepared by mixing and dispersing waterborne polyurethane adhesive, multi-walled carbon nanotube-silver powder core-shell filler, polyimide flexible toughening agent, wetting and dispersing agent, leveling agent, and deionized water in appropriate weight proportions. The viscosity is then adjusted to 70mPa·s, and the fineness is no greater than 15μm.

[0034] In this embodiment, the optical camouflage coating is formed by coating and curing an optical paste. The optical paste comprises 50 parts by weight of an acrylate copolymer binder, 18 parts of SiO2-TiO2-coated rare earth-doped modified pigment, 2.8 parts of multi-walled carbon nanotube-silver powder core filler, 0.19 parts of a thickener, 0.28 parts of a defoamer, and 21 parts of deionized water. The acrylate copolymer binder has a solid content of 38%. The thickener is hydroxyethyl cellulose. The defoamer is an organosilicon defoamer. The preparation method of SiO2-TiO2-coated rare earth doped modified pigment includes mixing and dispersing 78 parts by weight of near-infrared reflective pigment with 100 parts by weight of ethanol aqueous solution to form a suspension, then adding 9.5 parts by weight of tetraethyl orthosilicate and 4.8 parts by weight of tetrabutyl titanate at a controlled dropping rate of 0.46 mL / min, stirring at a controlled temperature of 28℃ until the dropping is complete, adjusting the pH to 8.5 with ammonia water, adding 0.5 parts by weight of europium nitrate and continuing to stir for 3.5 h, and finally filtering, washing to neutral, vacuum drying and calcining to obtain SiO2-TiO2-coated rare earth doped modified pigment. The optical paste is prepared by mixing and dispersing appropriate weight parts of acrylate copolymer binder, SiO2-TiO2-coated rare earth doped modified pigment, multi-walled carbon nanotube-silver powder core filler, thickener, defoamer and deionized water, and then adjusting the viscosity to 55 mPa·s and the fineness to no more than 10 μm.

[0035] A method for preparing an anti-multi-band reconnaissance webbing, used to prepare the anti-multi-band reconnaissance webbing as described above, includes the following steps: Step 1: Take the fiber substrate and perform etching activation treatment. The etching activation treatment includes taking the polyester / cotton webbing substrate and performing vacuum plasma treatment to obtain an etched webbing substrate with 1-3μm grooves on the surface. Then, immerse the etched webbing substrate in a composite solution and perform constant temperature oscillation treatment at 30℃ for 35 minutes, and then take it out and dry it. The composite solution is composed of deionized water, nano calcium carbonate and silane coupling agent with a mass ratio of 100:5:0.95 to obtain an activated webbing substrate. Step 2: Coat the surface of the activated webbing substrate with a mid- to far-infrared paste, and control the temperature at 80°C for 3 minutes to obtain a webbing blank with a mid- to far-infrared prepolymer layer with a crosslinking degree of 30%. Step 3: Electrospinning in-situ deposit a transition layer on the surface of the mid-far-infrared prepolymer layer of the ribbon preform. The voltage of the electrospinning in-situ deposition is controlled at 16V and the spraying rate is 0.295mL / h to obtain a transition layer with a thickness of 60nm and a fiber diameter of 200-500nm. Microwave crosslinking treatment is then performed to control the crosslinking degree between the transition layer and the mid-far-infrared prepolymer layer to increase to 70% to obtain a crosslinked ribbon. Step 4: Coat the transition layer surface of the cross-linked webbing with optical paste, cure it with ultraviolet light, and then finish it to obtain the finished anti-multi-band reconnaissance webbing.

[0036] Example 2

[0037] like Figure 1 As shown, a multi-band reconnaissance camouflage webbing includes a fiber substrate and a mid- to far-infrared camouflage coating and an optical camouflage coating sequentially coated and cured. Simultaneously, a transition layer is formed between the mid- to far-infrared camouflage coating and the optical camouflage coating. The transition layer is formed by in-situ deposition of a transition slurry onto the surface of the pre-crosslinked mid- to far-infrared camouflage coating.

[0038] The transition slurry comprises 82 parts by weight of end-modified waterborne PU-PA block copolymer, 1.6 parts by weight of nano-hydroxyapatite, 2.8 parts by weight of waterborne epoxy curing agent, 0.75 parts by weight of nonionic wetting and dispersing agent, and 9.1 parts by weight of deionized water. In the transition slurry, the end-modified waterborne PU-PA block copolymer has a solid content of 40% and contains 17.1 wt% polysiloxane segments. The waterborne epoxy curing agent is a polyamide-amine type curing agent. The nonionic wetting and dispersing agent is polyoxyethylene ether.

[0039] It should be noted that the preparation method of the transition slurry includes the following steps: Step ① Stirring the end-group modified waterborne PU-PA block copolymer, controlling the stirring speed at 290 r / min, the stirring temperature at 25℃, and the stirring time at 15 min to obtain a dispersed copolymer slurry; Step ② Adding nano-hydroxyapatite to the dispersed copolymer slurry and heating it to 39℃, controlling the stirring speed at 780 r / min, and dispersing it for 29 min to obtain a mixed dispersion slurry; Step ③ Adding waterborne epoxy curing agent and nonionic wetting and dispersing agent sequentially to the mixed dispersion slurry and cooling it to 29℃, controlling the stirring speed at 290 r / min and stirring for 19 min, and then adding deionized water to obtain a pretreated transition slurry with a viscosity of 50 mPa·s; Step ④ Grinding the pretreated transition slurry to obtain the transition slurry.

[0040] Meanwhile, the mid-to-far-infrared camouflage coating is formed by coating and curing a mid-to-far-infrared slurry. The mid-to-far-infrared slurry comprises 52 parts by weight of waterborne polyurethane binder, 24 parts by weight of multi-walled carbon nanotube-silver powder core filler, 5 parts by weight of polyimide flexible toughening agent, 0.52 parts by weight of wetting and dispersing agent, 0.31 parts by weight of leveling agent, and 19.2 parts by weight of deionized water. The solid content of the waterborne polyurethane binder is 36%, and the solid content of the polyimide flexible toughening agent is 41%. The preparation method of multi-walled carbon nanotube-silver powder core-shell filler includes mixing 69 parts by weight of silver powder, 9.5 parts by weight of multi-walled carbon nanotubes, and 51 parts by weight of anhydrous ethanol. After ultrasonic dispersion, argon gas is introduced and plasma treatment is performed. The plasma treatment power is controlled at 75W, the vacuum degree is 0.06MPa, and the treatment time is 11min. Then, 15 parts by weight of polyethylene glycol and 2.9 parts by weight of silane coupling agent are added, and the reaction is carried out at a controlled temperature of 59℃ with stirring for 2.1h. After centrifugation and vacuum drying, multi-walled carbon nanotube-silver powder core-shell filler is obtained. The mid- and far-infrared slurry is prepared by mixing and dispersing waterborne polyurethane adhesive, multi-walled carbon nanotube-silver powder core-shell filler, polyimide flexible toughening agent, wetting and dispersing agent, leveling agent, and deionized water in appropriate weight proportions. The viscosity is then adjusted to 80mPa·s, and the fineness is no greater than 15μm.

[0041] In this embodiment, the optical camouflage coating is formed by coating and curing an optical paste. The optical paste comprises 52 parts by weight of an acrylate copolymer binder, 19 parts by weight of a SiO2-TiO2-coated rare earth-doped modified pigment, 2.9 parts by weight of a multi-walled carbon nanotube-silver powder core filler, 0.2 parts by weight of a thickener, 0.3 parts by weight of a defoamer, and 22 parts by weight of deionized water. The acrylate copolymer binder has a solid content of 39%. The thickener is hydroxyethyl cellulose. The defoamer is an organosilicon defoamer. The preparation method of SiO2-TiO2-coated rare earth doped modified pigment includes mixing and dispersing 80 parts by weight of near-infrared reflective pigment with 100 parts by weight of ethanol aqueous solution to form a suspension, then adding 9.8 parts by weight of tetraethyl orthosilicate and 5 parts by weight of tetrabutyl titanate, controlling the dropping rate at 0.48 mL / min, stirring at 30℃ until the dropping is complete, adjusting the pH to 8.6 with ammonia water, adding 0.51 parts by weight of europium nitrate and continuing to stir for 3.2 h, and finally filtering, washing to neutral, vacuum drying and calcining to obtain SiO2-TiO2-coated rare earth doped modified pigment. The optical paste is prepared by mixing and dispersing appropriate weight parts of acrylate copolymer binder, SiO2-TiO2-coated rare earth doped modified pigment, multi-walled carbon nanotube-silver powder core filler, thickener, defoamer and deionized water, and then adjusting the viscosity to 60 mPa·s and the fineness to no more than 10 μm.

[0042] A method for preparing an anti-multi-band reconnaissance webbing, used to prepare the anti-multi-band reconnaissance webbing as described above, includes the following steps: Step 1: Take the fiber substrate and perform etching activation treatment. The etching activation treatment includes taking the polyester / cotton webbing substrate and performing vacuum plasma treatment to obtain an etched webbing substrate with 1-3μm grooves on the surface. Then, immerse the etched webbing substrate in a composite solution and perform constant temperature oscillation treatment at 32℃ for 32 minutes, and then take it out and dry it. The composite solution is composed of deionized water, nano calcium carbonate and silane coupling agent with a mass ratio of 105:5.2:0.98 to obtain an activated webbing substrate. Step 2: Coat the surface of the activated webbing substrate with a mid- to far-infrared paste, and control the temperature at 85°C for 2.8 minutes to obtain a webbing blank with a mid- to far-infrared prepolymer layer having a crosslinking degree of 30%. Step 3: Electrospinning in-situ deposit a transition layer on the surface of the mid-far-infrared prepolymer layer of the ribbon preform. The voltage of the electrospinning in-situ deposition is controlled at 18V and the spraying rate is 0.3mL / h to obtain a transition layer with a thickness of 80nm and a fiber diameter of 200-500nm. Microwave crosslinking treatment is then performed to control the crosslinking degree between the transition layer and the mid-far-infrared prepolymer layer to increase to 70% to obtain a crosslinked ribbon. Step 4: Coat the transition layer surface of the cross-linked webbing with optical paste, cure it with ultraviolet light, and then finish it to obtain the finished anti-multi-band reconnaissance webbing.

[0043] Example 3

[0044] like Figure 1 As shown, a multi-band reconnaissance camouflage webbing includes a fiber substrate and a mid- to far-infrared camouflage coating and an optical camouflage coating sequentially coated and cured. Simultaneously, a transition layer is formed between the mid- to far-infrared camouflage coating and the optical camouflage coating. The transition layer is formed by in-situ deposition of a transition slurry onto the surface of the pre-crosslinked mid- to far-infrared camouflage coating.

[0045] The transition slurry comprises 85 parts by weight of end-modified waterborne PU-PA block copolymer, 2 parts by weight of nano-hydroxyapatite, 3 parts by weight of waterborne epoxy curing agent, 0.8 parts by weight of nonionic wetting and dispersing agent, and 9.2 parts by weight of deionized water. In the transition slurry, the end-modified waterborne PU-PA block copolymer has a solid content of 42% and contains 17.8 wt% polysiloxane segments. The waterborne epoxy curing agent is a polyamide-amine type curing agent. The nonionic wetting and dispersing agent is polyoxyethylene ether.

[0046] It should be noted that the preparation method of the transition slurry includes the following steps: Step ① Stirring the end-group modified waterborne PU-PA block copolymer, controlling the stirring speed at 300 r / min, the stirring temperature at 27℃, and the stirring time at 14 min to obtain a dispersed copolymer slurry; Step ② Adding nano-hydroxyapatite to the dispersed copolymer slurry and heating it to 40℃, controlling the stirring speed at 800 r / min, and dispersing it for 28 min to obtain a mixed dispersion slurry; Step ③ Adding waterborne epoxy curing agent and nonionic wetting and dispersing agent sequentially to the mixed dispersion slurry and cooling it to 30℃, controlling the stirring speed at 300 r / min and stirring for 18 min, and then adding deionized water to obtain a pretreated transition slurry with a viscosity of 55 mPa·s; Step ④ Grinding the pretreated transition slurry to obtain the transition slurry.

[0047] Meanwhile, the mid-to-far-infrared camouflage coating is formed by coating and curing a mid-to-far-infrared slurry. The mid-to-far-infrared slurry comprises 55 parts by weight of waterborne polyurethane binder, 25 parts by weight of multi-walled carbon nanotube-silver powder core filler, 5.2 parts by weight of polyimide flexible toughening agent, 0.55 parts by weight of wetting and dispersing agent, 0.32 parts by weight of leveling agent, and 19.5 parts by weight of deionized water. The solid content of the waterborne polyurethane binder is 38%, and the solid content of the polyimide flexible toughening agent is 42%. The preparation method of multi-walled carbon nanotube-silver powder core-shell filler includes mixing 70 parts by weight of silver powder, 10 parts by weight of multi-walled carbon nanotubes, and 52 parts by weight of anhydrous ethanol. After ultrasonic dispersion, argon gas is introduced and plasma treatment is performed. The plasma treatment power is controlled at 80W, the vacuum degree is 0.08MPa, and the treatment time is 10min. Then, 16 parts by weight of polyethylene glycol and 3 parts by weight of silane coupling agent are added, and the reaction is carried out at a controlled temperature of 60℃ with stirring for 2h. After centrifugation and vacuum drying, multi-walled carbon nanotube-silver powder core-shell filler is obtained. The mid- and far-infrared slurry is prepared by mixing and dispersing waterborne polyurethane adhesive, multi-walled carbon nanotube-silver powder core-shell filler, polyimide flexible toughening agent, wetting and dispersing agent, leveling agent, and deionized water in appropriate weight proportions. The viscosity is then adjusted to 90mPa·s, and the fineness is no greater than 15μm.

[0048] In this embodiment, the optical camouflage coating is formed by coating and curing an optical paste. The optical paste comprises 55 parts by weight of an acrylate copolymer binder, 20 parts by weight of a SiO2-TiO2-coated rare earth-doped modified pigment, 3 parts by weight of a multi-walled carbon nanotube-silver powder core filler, 0.21 parts by weight of a thickener, 0.32 parts by weight of a defoamer, and 22 parts by weight of deionized water. The acrylate copolymer binder has a solid content of 40%. The thickener is hydroxyethyl cellulose. The defoamer is an organosilicon defoamer. The preparation method of SiO2-TiO2 coated rare earth doped modified pigment includes mixing and dispersing 82 parts by weight of near-infrared reflective pigment with 100 parts by weight of ethanol aqueous solution to form a suspension, then adding 10 parts by weight of tetraethyl orthosilicate and 5.2 parts by weight of tetrabutyl titanate, controlling the dropping rate at 0.5 mL / min, stirring at 32℃ until the dropping is complete, adjusting the pH to 9 with ammonia water, adding 0.52 parts by weight of europium nitrate and continuing to stir for 3 hours, and finally filtering, washing to neutral, vacuum drying and calcining to obtain SiO2-TiO2 coated rare earth doped modified pigment. The optical paste is obtained by mixing and dispersing appropriate weight parts of acrylate copolymer binder, SiO2-TiO2 coated rare earth doped modified pigment, multi-walled carbon nanotube-silver powder core filler, thickener, defoamer and deionized water, and then adjusting the viscosity to 65 mPa·s and the fineness to no more than 10 μm.

[0049] A method for preparing an anti-multi-band reconnaissance webbing, used to prepare the anti-multi-band reconnaissance webbing as described above, includes the following steps: Step 1: Take the fiber substrate and perform etching activation treatment. The etching activation treatment includes taking the polyester / cotton webbing substrate and performing vacuum plasma treatment to obtain an etched webbing substrate with 1-3μm grooves on the surface. Then, immerse the etched webbing substrate in a composite solution and perform constant temperature oscillation treatment at 35℃ for 30 minutes, and then take it out and dry it. The composite solution is composed of deionized water, nano calcium carbonate and silane coupling agent with a mass ratio of 110:5.5:1 to obtain an activated webbing substrate. Step 2: Coat the surface of the activated webbing substrate with a mid- to far-infrared paste, and control the temperature at 90°C for 2.5 minutes to obtain a webbing blank with a mid- to far-infrared prepolymer layer having a crosslinking degree of 30%. Step 3: Electrospinning in-situ depositing a transition layer onto the surface of the mid-far-infrared prepolymer layer of the ribbon preform, controlling the voltage of the electrospinning in-situ deposition to be 20V and the spraying rate to be 0.305mL / h, to obtain a transition layer with a thickness of 95nm and a fiber diameter of 200-500nm, and then performing microwave crosslinking treatment to control the crosslinking degree between the transition layer and the mid-far-infrared prepolymer layer to be increased to 70%, thus obtaining a crosslinked ribbon; Step 4: Coat the transition layer surface of the cross-linked webbing with optical paste, cure it with ultraviolet light, and then finish it to obtain the finished anti-multi-band reconnaissance webbing.

[0050] Comparative Example 1 The difference between Comparative Example 1 and Example 2 is that Comparative Example 1 does not have a transition layer.

[0051] Comparative Example 2 The difference between Comparative Example 2 and Example 2 is that the end-group modified waterborne PU-PA block copolymer in Comparative Example 2 is replaced by a waterborne PU-PA block copolymer.

[0052] Comparative Example 3 The difference between Comparative Example 3 and Example 2 is that the multi-walled carbon nanotube-silver powder core filler in Comparative Example 3 is replaced by multi-walled carbon nanotubes.

[0053] Comparative Example 4 The difference between Comparative Example 4 and Example 2 is that the SiO2-TiO2 coated rare earth doped modified pigment in Comparative Example 4 is replaced by a near-infrared reflective pigment.

[0054] Performance testing: 1. Flexibility test: According to GB / T 3920-2008 "Textiles - Tests for color fastness to rubbing" and GB / T 26381-2011 "Tests for mechanical properties of webbing", a bending tester is used to perform bending tests until the coating shows signs of cracking. A bending test with more than 1500 bending cycles is considered excellent, 1000-1500 cycles is considered good, and less than 1000 cycles is considered unqualified. 2. Durability test: According to GB / T 2790-1995 "Adhesives - 180° Peel Strength Test Method - Flexible Materials to Flexible Materials", based on a tensile speed of 100 mm / min, the maximum tensile force is tested, and a peel strength greater than 3.0 N / cm is excellent, 1.5-3.0 N / cm is good, and less than 1.5 N / cm is unqualified; 3. Mid- and far-infrared emissivity test: According to GB / T 25267-2010 "Method for Measurement of Infrared Emissivity", the emissivity of the sample in the 8-14μm band is tested under an environment with a controlled temperature of 25±2℃. An emissivity of less than 0.45 is considered excellent, 0.45-0.6 is considered good, and greater than 0.6 is considered unqualified. 4. Near-infrared reflectance spectral matching degree test: according to the spectral matching degree test method in GJB 1410A-2001 "General Specification for Military Camouflage Coatings".

[0055] Performance tests were conducted on Examples 1 to 3 and Comparative Examples 1 to 3. The performance test structure is shown in Table 1 below.

[0056] Table 1 Performance Test Results

[0057] As can be seen from Table 1 above, the anti-multi-band reconnaissance webbing in Embodiments 1 to 3 of this application.

[0058] By incorporating flexible polysiloxane segments into the transition layer and adding polyimide toughening agents to the mid- and far-infrared camouflage coating, gradient curing is achieved to release stress while simultaneously creating chemical bonds in the transition layer to strengthen interlayer adhesion. Furthermore, SiO2-TiO2-coated rare-earth-doped modified pigments effectively improve water resistance and UV resistance, and the construction of a conductive network using multi-walled carbon nanotubes and silver powder core fillers reduces emissivity, synergistically enhancing spectral matching with the rare-earth-doped pigments. In Comparative Example 1, the far-infrared camouflage coating and optical camouflage coating are directly bonded together, leading to interlayer stress concentration and a high susceptibility to cracking without a transition layer. Interlayer light scattering causes spectral distortion, and the lack of a transition layer further increases emissivity. In Comparative Example 2, the waterborne PU-PA block copolymer exhibits a hard and brittle interlayer bond, making it difficult to buffer bending stress. Its weak interlayer bond and high infrared transmittance also prevent effective emissivity reduction. In Comparative Example 3, the poor dispersibility of the single multi-walled carbon nanotubes leads to agglomeration, forming stress points and reducing the flexibility of the coating. In Comparative Example 4, the poor density of the near-infrared reflective pigment coating causes punctures when bent. Furthermore, the near-infrared reflective pigment has a narrow reflection peak, resulting in poor matching with the natural background. Without rare-earth-free doping, it is difficult to produce an effective synergistic effect, leading to a weak red-edge effect.

[0059] In summary, this application provides a multi-band reconnaissance protection webbing and its preparation method. This method offers advantages such as convenient processing and significantly improved overall flexibility and enhanced anti-reconnaissance capabilities. Furthermore, during the etching and activation treatment to obtain the activated webbing substrate, a micron-level rough structure and active bonding sites are constructed on the surface of the fiber substrate. This significantly improves the physical anchoring and chemical bonding force with the mid- and far-infrared paste while avoiding affecting the flexibility of the fiber substrate.

[0060] This anti-multi-band reconnaissance webbing achieves anti-reconnaissance effects in the visible and mid-to-far-infrared bands by assembling a four-layer structure consisting of a fiber substrate, a mid-to-far-infrared camouflage coating, a transition layer, and an optical camouflage coating. Simultaneously, it effectively improves interlayer bonding, flexibility, and durability. Specifically, by using end-group modified waterborne PU-PA block copolymer and nano-hydroxyapatite as core components to form a transition slurry, which is then deposited in situ and bonded to a pre-crosslinked substrate, a stable chemical bond and molecular interpenetrating structure are formed. This significantly enhances interlayer bonding, prevents coating peeling, and strengthens the structural stability of the anti-multi-band reconnaissance webbing. Meanwhile, by preparing multi-walled carbon nanotube-silver powder core filler, it is possible to synergistically reduce the overall mid- and far-infrared emissivity, achieving a synergistic effect of optical camouflage and thermal infrared camouflage, thereby enhancing the synergistic effect of multi-band anti-reconnaissance. Furthermore, by preparing SiO2-TiO2-coated rare-earth-doped modified pigments, the water resistance and UV aging resistance of near-infrared reflective pigments in this anti-multi-band reconnaissance webbing are significantly improved. Through the strong near-infrared band reflectivity matching degree of europium ions, the optical camouflage coating exhibits a corresponding camouflage color in the visible light region and highly matches the near-infrared spectrum of the natural background, thereby significantly enhancing the optical reconnaissance evasion effect.

[0061] The terms “first,” “second,” “third,” “fourth,” etc., used in this application (if applicable) are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, or apparatus that includes a series of steps or units is not necessarily limited to those explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, or apparatus.

[0062] It should be noted that the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0063] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A webbing for preventing multi-band reconnaissance, characterized in that: It includes a fiber substrate and a mid- to far-infrared camouflage coating and an optical camouflage coating that are sequentially coated and cured. A transition layer is formed between the mid- and far-infrared camouflage coating and the optical camouflage coating; The transition layer is formed by in-situ deposition of a transition slurry onto the surface of the pre-crosslinked mid- and far-infrared camouflage coating; The transition slurry comprises 80-85 parts by weight of end-modified waterborne PU-PA block copolymer, 1.8-2 parts by weight of nano-hydroxyapatite, 2.7-3 parts by weight of waterborne epoxy curing agent, 0.7-0.8 parts by weight of nonionic wetting and dispersing agent, and 9-9.2 parts by weight of deionized water.

2. The anti-multi-band reconnaissance webbing according to claim 1, characterized in that: The end-group modified waterborne PU-PA block copolymer has a solid content of 38-42% and contains 15-18 wt% polysiloxane segments; the nano-hydroxyapatite has a hydroxyl content of not less than 3.2 mmol / g; the waterborne epoxy curing agent is a polyamide amine type curing agent; and the nonionic wetting and dispersing agent is polyoxyethylene ether.

3. The anti-multi-band reconnaissance webbing according to claim 1, characterized in that: The preparation method of the transition slurry includes the following steps: Step ① Stirring the end-group modified waterborne PU-PA block copolymer, controlling the stirring speed at 280-300 r / min, the stirring temperature at 23-27℃, and the stirring time at 14-16 min to obtain a dispersed copolymer slurry; Step ② Adding nano-hydroxyapatite to the dispersed copolymer slurry and heating it to 38-40℃, controlling the stirring speed at 750-800 r / min, and dispersing it for 28-30 min to obtain a mixed dispersion slurry; Step ③ Adding waterborne epoxy curing agent and nonionic wetting and dispersing agent sequentially to the mixed dispersion slurry and cooling it to 28-30℃, controlling the stirring speed at 280-300 r / min and stirring for 18-20 min, and then adding deionized water to obtain a pretreated transition slurry with a viscosity of 45-55 mPa·s; Step ④ Grinding the pretreated transition slurry to obtain a transition slurry.

4. The anti-multi-band reconnaissance webbing according to claim 1, characterized in that: The mid- and far-infrared camouflage coating is formed by coating and curing a mid- and far-infrared slurry; the mid- and far-infrared slurry includes 50-55 parts by weight of waterborne polyurethane adhesive, 23-25 ​​parts by weight of multi-walled carbon nanotube-silver powder core filler, 4.8-5.2 parts by weight of polyimide flexible toughening agent, 0.5-0.55 parts by weight of wetting and dispersing agent, 0.3-0.32 parts by weight of leveling agent, and 19-19.5 parts by weight of deionized water.

5. The anti-multi-band reconnaissance webbing according to claim 4, characterized in that: The waterborne polyurethane adhesive has a solid content of 35-38%, and the polyimide flexible toughening agent has a solid content of 40-42%. The preparation method of the multi-walled carbon nanotube-silver powder core-shell filler includes mixing 68-70 parts by weight of silver powder, 9-10 parts by weight of multi-walled carbon nanotubes, and 50-52 parts by weight of anhydrous ethanol. After ultrasonic dispersion, argon gas is introduced and plasma treatment is performed. The plasma treatment power is controlled at 70-80W, the vacuum degree is 0.05-0.08MPa, and the treatment time is 10-11min. Then, 14-16 parts by weight of polyethylene glycol and 2.8-3 parts by weight of silane coupling agent are added. The mixture is stirred and reacted at a controlled temperature of 58-60℃ for 2-2.2h. After centrifugation and vacuum drying, the multi-walled carbon nanotube-silver powder core-shell filler is obtained.

6. The anti-multi-band reconnaissance webbing according to claim 1, characterized in that: The mid- and far-infrared slurry is obtained by mixing and dispersing water-based polyurethane adhesive, multi-walled carbon nanotube-silver powder core filler, polyimide flexible toughening agent, wetting and dispersing agent, leveling agent and deionized water, and adjusting the viscosity to 70-90 mPa·s and the fineness to no more than 15 μm.

7. The anti-multi-band reconnaissance webbing according to claim 6, characterized in that: The optical camouflage coating is formed by coating and curing an optical slurry; the optical slurry includes 50-55 parts by weight of acrylate copolymer binder, 18-20 parts by weight of SiO2-TiO2 coated rare earth doped modified pigment, 2.8-3 parts by weight of multi-walled carbon nanotube-silver powder core filler, 0.19-0.21 parts by weight of thickener, 0.28-0.32 parts by weight of defoamer, and 21-22 parts by weight of deionized water.

8. The anti-multi-band reconnaissance webbing according to claim 7, characterized in that: The acrylate copolymer adhesive has a solid content of 38-40%, the thickener is hydroxyethyl cellulose, and the defoamer is an organosilicon defoamer. The preparation method of the SiO2-TiO2 coated rare earth doped modified pigment includes mixing and dispersing 78-82 parts by weight of near-infrared reflective pigment with 100 parts by weight of ethanol aqueous solution to form a suspension, then adding 9.5-10 parts by weight of tetraethyl orthosilicate and 4.8-5.2 parts by weight of tetrabutyl titanate, controlling the dropping rate at 0.46-0.5 mL / min, stirring at a controlled temperature of 28-32℃ until the dropping is complete, adjusting the pH to 8.5-9 with ammonia water, adding 0.5-0.52 parts by weight of europium nitrate and continuing to stir and react for 3-3.5 h, and finally filtering, washing to neutral, vacuum drying and calcining to obtain the SiO2-TiO2 coated rare earth doped modified pigment.

9. A method for preparing an anti-multi-band reconnaissance webbing, used to prepare an anti-multi-band reconnaissance webbing as described in any one of claims 1-8, characterized in that, Includes the following steps: Step 1: Take the fiber substrate and perform etching and activation treatment to obtain activated webbing substrate; Step 2: Coat the surface of the activated webbing substrate with a mid- to far-infrared paste, and control the temperature at 80-90℃ for 2.5-3 minutes to obtain a webbing blank with a mid- to far-infrared prepolymer layer with a crosslinking degree of 30%. Step 3: Electrospinning in-situ deposit a transition layer on the surface of the mid-far-infrared prepolymer layer of the ribbon preform. Control the voltage of the electrospinning in-situ deposition to be 16-20V and the spraying rate to be 0.295-0.305mL / h to obtain a transition layer with a thickness of 50-100nm and a fiber diameter of 200-500nm. Then, perform microwave crosslinking treatment to control the crosslinking degree between the transition layer and the mid-far-infrared prepolymer layer to increase to 70% to obtain crosslinked ribbon. Step 4: Coat the transition layer surface of the cross-linked webbing with optical paste, cure it with ultraviolet light, and then finish it to obtain the finished anti-multi-band reconnaissance webbing.

10. The method for preparing a multi-band reconnaissance protection webbing according to claim 1, characterized in that: The etching activation treatment includes taking a polyester / cotton webbing substrate and subjecting it to vacuum plasma treatment to obtain an etched webbing substrate with 1-3 μm grooves on the surface. Then, the etched webbing substrate is immersed in a composite solution and subjected to constant temperature oscillation treatment at 30-35℃ for 30-35 min, and then taken out and dried. The composite solution is composed of deionized water, nano-calcium carbonate and silane coupling agent in a mass ratio of 100-110:5-5.5:0.95-1.

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