Camouflage protective material as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of protective materials, and particularly discloses a camouflage protective material and a preparation method and application thereof.The camouflage protective material sequentially comprises an anti-impact layer, a bulletproof and puncture-proof layer, a flame-retardant layer and a heat insulation layer from outside to inside; wherein the anti-impact layer comprises, by weight, 40%-65% of resin, 30%-42% of a fiber woven body and 3%-18% of a coupling agent, the bulletproof and stab-resistant layer is composed of, by weight, 40%-55% of conductive fibers and 45%-60% of aramid fibers, the flame-retardant layer is a polysulfonamide fiber woven body, the heat insulation layer is a hybrid fiber woven body, and the anti-impact layer is made of polypropylene fibers. The hybrid fiber woven body is composed of PEO fibers, silver-plated fibers and ZnO polyester fibers in a specific proportion, and during preparation, all the layers are independently prepared, parameters such as temperature and pressure are controlled, and then composite forming is conducted. Through synergistic compounding of a multi-layer structure and materials, comprehensive protection of impact resistance, flame retardance, heat insulation and infrared / radar stealth is achieved, the protection capacity in a complex environment is improved, and the special protection requirements of military and civilian are met.

Description

Technical Field

[0001] The present invention belongs to the technical field of protective materials, and particularly relates to a camouflage protective material, a preparation method thereof, and an application thereof. Background Art

[0002] With the rapid development of modern detection technologies such as infrared thermal imaging and radar remote sensing, higher requirements are put forward for the comprehensive performance of protective materials in the civil-military dual-use field. Important infrastructure and special operating environments need to simultaneously cope with multiple threats such as explosion shock waves, high-speed debris, high-temperature flames, and ignition of combustible gases, and need to achieve feature matching with the background environment through camouflage means, thereby reducing the probability of being identified by reconnaissance equipment. However, the existing protective material systems generally have the defect of single function, and it is difficult to meet the actual combat requirements of "impact resistance - flame retardancy - heat insulation - stealth" with synergistic effects.

[0003] For example, a kind of emergency explosion-proof material for blocking explosion shock waves disclosed in Patent CN110006303A is a multi-layer lightweight protective material adopting "reflection - barrier - energy absorption - support". Among them, the reflection layer selects special-shaped ultra-strong alloy steel sheets to effectively disperse the explosion shock waves and meet the requirements of rapid response of the explosion isolation system for emergency rescue; the barrier layer selects fiber resin reinforced composite materials to play a role in blocking shock waves and flying objects; the energy absorption layer selects porous materials to play a role in absorbing the energy of shock waves; the support layer selects fiber resin reinforced composite materials to support the elastic foam layer. This patent reflects and absorbs explosion shock waves through the synergistic effect of multi-layer structures, reduces the damage of explosion shock waves to personnel and buildings, and realizes the impact-resistant protection, but does not involve thermal protection and stealth functions. Another example is the bulletproof and explosion-proof composite structure proposed in Patent CN115891312A. Although this patent has the function of continuously absorbing shock waves and can reduce the impact of shock waves on the protected target, it cannot resist the high temperature and erosion of combustible gases in the combustion environment.

[0004] In summary, the limitations of the existing technologies are as follows: it is difficult for traditional protective materials to simultaneously achieve the synergistic performance of "impact resistance - flame retardancy - heat insulation - stealth". In explosion or impact events, the coupled effects of high temperature, debris, and combustible gases easily lead to the failure of protection, and the exposed protective structure is easily a target for reconnaissance equipment to identify. Therefore, it is urgent to develop a camouflage protective material with the characteristics of impact resistance, flame retardancy and explosion suppression, high-efficiency heat insulation, and infrared / radar stealth to cope with the challenges of multi-physical field coupling effects in complex environments and improve the all-dimensional protection ability of civil-military dual-use facilities.

[0005] In view of this, this invention is specifically proposed. Summary of the Invention

[0006] The object of the present invention is to overcome the above-mentioned disadvantages of the prior art, and provides a camouflage protection material, its preparation method and application. It mainly aims at the technical bottleneck that it is difficult for existing protection materials to simultaneously achieve the coordinated performance of "impact resistance - flame retardancy - heat insulation - infrared / radar stealth", solves the problem of protection failure caused by the multi-physical field coupling effect of high temperature, high-speed fragments and combustible gases in complex environments (such as explosions and fires), and at the same time overcomes the defect that traditional protection structures are easily identified by reconnaissance equipment such as infrared thermal imaging and radar remote sensing.

[0007] The object of the present invention is solved by the following technical solutions:

[0008] In the first aspect, the present invention provides a camouflage protection material, which sequentially includes an impact-resistant layer, a bulletproof and stab-resistant layer, a flame-retardant layer and a heat-insulating layer from outside to inside;

[0009] Among them, the impact-resistant layer, by weight percentage, includes 40% - 65% of resin, 30% - 42% of fiber braid and 3% - 18% of coupling agent;

[0010] The bulletproof and stab-resistant layer, by weight percentage, includes 40% - 55% of conductive fiber and 45% - 60% of aramid fiber;

[0011] The flame-retardant layer is a meta-aramid fiber braid;

[0012] The heat-insulating layer is a hybrid fiber braid, and the hybrid fiber braid includes PEO fiber, silver-plated fiber and ZnO polyester fiber.

[0013] Further, the resin in the impact-resistant layer is selected from one of epoxy resin, phenolic resin, unsaturated polyester resin, polyether ether ketone resin, and polyimide resin.

[0014] Further, the fiber braid in the impact-resistant layer is a ultra-high molecular weight polyethylene fiber braid with a molecular weight greater than 1 million.

[0015] Further, the coupling agent in the impact-resistant layer is selected from one of KH550, KH560, and KH590.

[0016] Further, the conductive fiber in the bulletproof and stab-resistant layer is selected from one of nickel fiber, carbon fiber, carbon nanotube fiber, silicon carbide fiber, and polyaniline fiber.

[0017] Further, in the heat-insulating layer, the weight ratio of PEO fiber, silver-plated fiber to ZnO polyester fiber is (2 - 5):(3 - 4):(2 - 4).

[0018] In the second aspect, the present invention also provides a preparation method of the above-mentioned camouflage protection material, and the preparation method includes the following steps:

[0019] Step 1: Prepare the impact-resistant layer

[0020] ⅰ) Use a vacuum furnace to remove the organic matter on the surface of the fiber braid through vacuum heat treatment;

[0021] ⅱ) Mix the coupling agent, ethanol, and deionized water in a set ratio to hydrolyze the coupling agent to obtain a treatment solution; Immerse the fiber braid with the removed organic matter in the treatment solution, after ultrasonic oscillation for 20 min to 40 min, take out the fiber braid and dry it for standby;

[0022] ⅲ) Cut the dried fiber braid according to the designed size to obtain multiple unidirectional cut fiber braids; Immerse the multiple unidirectional cut fiber braids in resin for impregnation treatment, after impregnation for 1 h to 3 h, take out the multiple unidirectional cut fiber braids and dry them for standby;

[0023] ⅳ) Orthogonally stack the multiple dried unidirectional cut fiber braids so that the silk surfaces of adjacent two unidirectional cut fiber braids are in contact with each other, and then perform planar pressing at a set temperature to make the resin heat-melt and cure; After pressing for 0.5 h to 2 h, release the pressure and cool down to obtain the impact-resistant layer;

[0024] Step 2: Prepare the bulletproof and stab-resistant layer

[0025] ⅰ) Put the conductive fiber and aramid fiber into a cotton mixing device in proportion to mix them evenly to obtain mixed fiber;

[0026] ⅱ) Use a carding machine to card the mixed fiber. The carding needles on the carding machine card the mixed fiber into a single fiber state and arrange it into a parallel fiber thin layer;

[0027] ⅲ) Use the air-laying method to make the fiber thin layer into a fiber web; Send the fiber web into a pre-needling machine, and the needling needles of the pre-needling machine pierce up and down in the fiber web to obtain a fiber felt blank; Send the fiber felt blank into a main needling machine, and the needling needles of the main needling machine pierce up and down in the fiber web to obtain a fiber felt;

[0028] ⅳ) Use a vacuum furnace to perform heat treatment on the fiber felt through vacuum heat treatment to obtain the bulletproof and stab-resistant layer;

[0029] Step 3: Prepare the flame-retardant layer

[0030] First, loosen, card, form a web, and lay a web for the poly(phenylene sulfone amide) fiber, and then perform multiple needling and fixing of the web to obtain the flame-retardant layer;

[0031] Step 4: Prepare the heat-insulating layer

[0032] ⅰ) Put the PEO fibers, silver-plated fibers, and ZnO polyester fibers into a pre-opening device respectively for pre-opening to reduce the compactness of the PEO fibers, the silver-plated fibers, and the ZnO polyester fibers;

[0033] ⅱ) Put the pre-opened PEO fibers, silver-plated fibers, and ZnO polyester fibers into a mixing and opening device in proportion for opening and full mixing to obtain mixed fibers;

[0034] ⅲ) Put the mixed fibers into a carding machine for carding into a web to obtain a mixed fiber web;

[0035] ⅳ) Transport the mixed fiber web to the needling area of a needling machine for needling reinforcement to obtain a heat-insulating layer with a three-dimensional structure;

[0036] Step 5: Prepare the camouflage and protection material

[0037] Lay the heat-insulating layer, the flame-retardant layer, the bulletproof and stab-proof layer, and the impact-proof layer in sequence from bottom to top, and use a polyurethane adhesive to tightly bond each layer to obtain the camouflage and protection material.

[0038] Further, in Step 1, the parameters for the vacuum heat treatment are set as follows: the temperature is 80°C to 100°C, and the time is 15 min to 30 min;

[0039] The weight ratio of the coupling agent, ethanol, and deionized water is 1:(5 - 7):(1.5 - 3);

[0040] The parameters for the planar pressing are set as follows: the temperature is 110°C to 130°C, and the pressure is 5 MPa to 10 MPa.

[0041] Further, in Step 2, the parameters of the carding machine are set as follows: the needle density is 80 needles / cm 2 ~120 needles / cm 2 , the carding speed is 200 r / min to 300 r / min, and the carding gauge is 0.1 mm to 0.25 mm;

[0042] The parameters for the air-laying are set as follows: the air flow speed is 2 m / min to 3 m / min, the air flow pressure is 0.05 MPa to 0.15 MPa, and the air flow direction is blowing from top to bottom and sucking from bottom to top;

[0043] The parameters of the pre-needling machine are set as follows: the number of needles is 2000 needles to 3000 needles, the needling frequency is 500 stabs / min to 800 stabs / min, the needling density is 80 stabs / cm 2 ~120 stabs / cm 2 , the needling depth is 7 mm to 10 mm, and the number of needling passes is 5 passes to 10 passes;

[0044] The parameters of the main needling machine are set as follows: the number of needles is 4,600 to 5,000, the needling frequency is 1,000 stabs / min to 1,200 stabs / min, and the needling density is 100 stabs / cm 2 ~150 stabs / cm 2 , the needling depth is 7 mm to 10 mm, and the number of needling passes is 7 to 15;

[0045] The parameters of the vacuum heat treatment are set as follows: the temperature is 200 °C to 300 °C, and the time is 10 min to 20 min.

[0046] Further, the specific process of step 3 is as follows: First, use a bale opener to loosen the meta-aramid fiber, so that the meta-aramid fiber is loosened into a single fiber state under the tearing and hitting of the bale opener; then put the loosened meta-aramid fiber into a carding machine for carding to improve the parallel arrangement degree of the meta-aramid fiber and make the meta-aramid fiber evenly distributed; then convey the carded meta-aramid fiber to a forming screen through air flow, and under the action of the air flow, the meta-aramid fiber is randomly distributed on multiple planes to form multiple fiber webs; then stack the multiple fiber webs together according to the design requirements to form a preform; finally, send the preform into a needling machine, and use the puncture action of the needle to entangle the multiple fiber webs in the preform together to obtain a flame-retardant layer with a stable shape and not prone to deformation and displacement.

[0047] Thirdly, the present invention also provides an application of the above-mentioned camouflage and protection material, and the camouflage and protection material is applied to the field of military equipment protection or the field of civil protection.

[0048] Specifically, the field of military equipment protection includes the protection of the outer surfaces of military vehicles, aircraft and other equipment, or the camouflage covers of field shelters, radar stations, and individual protection equipment (such as bulletproof vests, helmets), etc.; the civil protection includes important energy facilities (such as chemical plants, oil storage tanks), etc.

[0049] Compared with the prior art, the present invention has the following beneficial effects:

[0050] The camouflage and protection material provided by the present invention, through the innovative design and material synergistic compounding of a multi-layer functional structure (including an impact-resistant layer, a bulletproof and stab-resistant layer, a flame-retardant layer, and a heat-insulating layer from outside to inside in sequence), breaks through the limitations of the single performance of traditional protection materials and realizes the comprehensive protection effects of impact resistance, flame retardancy, heat insulation, and infrared / radar stealth, which are specifically reflected in the following advantages:

[0051] First, it improves the impact resistance of the protective material. The impact protection layer of the present invention is located on the outermost layer of the protective material, which is made of ultra-high molecular weight polyethylene fibers (molecular weight > 1 million) with good impact resistance, soft bendability, and wear resistance, and resins with good mechanical properties and thermal stability. Combined with the orthogonal stacking process, a high-strength impact-resistant structure is formed, which can effectively resist the energy of explosion shock waves and the invasion of high-speed fragments. Its impact resistance is significantly better than that of traditional single materials.

[0052] Second, it realizes the coordination of bulletproof and stab-proof and radar stealth. The bulletproof and stab-proof layer of the present invention uses aramid fibers as the matrix (with characteristics such as light weight, high strength, low coefficient of thermal expansion, and impact hardening), mainly providing mechanical support, and composite conductive fibers (such as nickel fibers / carbon fibers) to form an absorbing structure. The conductive fibers absorb radar waves through dielectric loss / magnetic loss. In this way, while blocking the penetration of fragments, the radar cross-section is reduced, realizing the dual functions of "structural protection + radar stealth".

[0053] Third, it has flame retardant properties. The flame retardant layer of the present invention is made of meta-aramid fibers with excellent heat resistance characteristics. It does not melt and drip when encountering fire, can effectively block the ignition of combustible gases generated by explosions, and inhibit the spread of combustion, solving the problem of the failure of traditional materials in high-temperature combustion environments.

[0054] Fourth, it has high-efficiency heat insulation and infrared stealth. The heat insulation layer of the present invention is prepared by mixing PEO fibers, silver-plated fibers, and ZnO polyester fibers. Utilizing the low infrared emissivity characteristics of these three fibers and their spinnability compared to metal wires, through opening and mixing, carding into a web, and needling reinforcement, these three fibers form a three-dimensional fiber web to reduce the outward conduction of infrared radiation from the protected facility and the inward penetration of conduction heat from the external high-temperature environment, thereby reducing the infrared radiation difference between the protected facility and the surrounding background, and finally achieving the effects of heat insulation and infrared stealth.

[0055] In summary, through the compound combination of the impact protection layer, bulletproof and stab-proof layer, flame retardant layer, and heat insulation layer, the present invention can meet multiple protection requirements such as fire prevention, explosion prevention, and impact resistance, while meeting the requirements of infrared thermal image segmentation and radar scattering source suppression of the protected facility in different regions and seasons, realizing dual stealth of infrared and radar, solving the technical defect of single function of traditional protective materials, significantly improving the comprehensive protection ability in a multi-threat coupling environment, and meeting the protection requirements of special scenarios in the military and civilian dual-use fields. Brief Description of the Drawings

[0056] The drawings here are incorporated into the specification and form a part of this specification, and are used together with the specification to explain the principle of the present invention.

[0057] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following briefly introduces the accompanying drawings required for the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0058] Figure 1 It is a schematic structural diagram of the camouflage protection material of the present invention.

[0059] Wherein:

[0060] 1 is the impact-resistant layer; 2 is the bulletproof and stab-resistant layer; 3 is the flame-retardant layer; 4 is the heat-insulating layer. Specific embodiments

[0061] Here, the exemplary embodiments will be described in detail, and the examples are shown in the accompanying drawings. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. On the contrary, they are only examples of devices consistent with some aspects of the present invention detailed in the appended claims.

[0062] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0063] Embodiment 1

[0064] As Figure 1 shown, the camouflage protection material provided in this embodiment includes, from the outside to the inside (corresponding to from top to bottom in the figure), an impact-resistant layer 1, a bulletproof and stab-resistant layer 2, a flame-retardant layer 3, and a heat-insulating layer 4 in sequence.

[0065] Specifically, for the impact-resistant layer 1, by weight percentage, 40% of epoxy resin, 42% of ultra-high molecular weight polyethylene fiber braid, and 18% of KH550 are selected.

[0066] For the bulletproof and stab-resistant layer 2, by weight percentage, it is composed of 40% nickel fiber and 60% aramid fiber.

[0067] The flame-retardant layer 3 uses an aromatic poly-sulfone fiber braid.

[0068] The heat-insulating layer 4 is a hybrid fiber braid, and this hybrid fiber braid includes PEO fiber, silver-plated fiber, and ZnO polyester fiber, and PEO fiber: silver-plated fiber: ZnO polyester fiber = 2:3:2, and this ratio is by weight.

[0069] The preparation method of the camouflage protection material in this embodiment includes the following steps:

[0070] Step 1: Prepare the impact-proof layer 1

[0071] i) Glue removal from fiber braid: placing the ultra-high molecular weight polyethylene fiber braid in a vacuum oven and keeping it at 80° C. for 30 minutes to remove organic matter on the surface of the ultra-high molecular weight polyethylene fiber braid;

[0072] ii) Coupling agent treatment: KH550, ethanol and deionized water are mixed in a weight ratio of 1:5:1.5 to hydrolyze KH550 to obtain a treatment solution; the ultra-high molecular weight polyethylene fiber braid after degumming is immersed in the treatment solution, and after ultrasonic vibration for 20 minutes, the ultra-high molecular weight polyethylene fiber braid after degumming is taken out and dried at 80°C for use;

[0073] iii) cutting the dried ultra-high molecular weight polyethylene fiber braids according to the designed size to obtain a plurality of unidirectional cut fiber braids with a size of 60×60 mm; immersing the plurality of unidirectional cut fiber braids in epoxy resin for dipping, and after dipping for 1 hour, taking out the plurality of unidirectional cut fiber braids and drying them at 80° C. for use;

[0074] iv) stacking a plurality of dried and ready-to-use unidirectional cut fiber braids orthogonally so that the yarn surfaces of two adjacent unidirectional cut fiber braids are in contact with each other, and then performing plane pressurization at 110° C. with a pressurization pressure of 10 MPa to heat, melt, and solidify the epoxy resin; and releasing the pressure and cooling after pressurization for 0.5 h to obtain an impact-proof layer 1;

[0075] Step 2: Prepare the bulletproof and stab-proof layer 2

[0076] i) putting nickel fiber and aramid fiber into a cotton blending device according to a certain proportion, and fully mixing them in the cotton blending device so that the nickel fiber and the aramid fiber are evenly distributed to obtain mixed fiber;

[0077] ii) combing the mixed fiber with a carding machine, combing the mixed fiber into a single fiber state through the carding needles on the carding machine, and arranging the mixed fiber into parallel fiber layers; wherein the density of the carding needles of the carding machine is 80 needles / cm 2 , the carding speed of the carding machine is 200r / min, and the carding distance of the carding machine is 0.1mm;

[0078] ⅲ) forming a fiber web from the fiber thin layer by air-laying; feeding the fiber web into a pre-needling machine, wherein the needles of the pre-needling machine pierce the fiber web up and down to obtain a fiber felt blank; feeding the fiber felt blank into a main needling machine, wherein the needles of the main needling machine pierce the fiber web up and down to obtain a fiber felt; wherein the air flow velocity of the air-laying is 2 m / min, the air flow pressure is 0.05 MPa, and the air flow direction is upward blowing and downward suction; the number of needles of the pre-needling machine is 2000, the needling frequency is 500 punctures / min, and the needling density is 80 punctures / cm2 The needle penetration depth is 7 mm, and the number of needle penetration passes is 10; the number of needles of the main needle punching machine is 4,600 needles, the needle punching frequency is 1,000 punches / min, and the needle punching density is 100 punches / cm 2 The needle penetration depth is 7 mm, and the number of needle penetration passes is 7;

[0079] ⅳ) Place the fiber felt in a vacuum furnace and keep it at 200 °C for 20 min to obtain the bulletproof and stab-proof layer 2;

[0080] Step 3: Prepare the flame-retardant layer 3

[0081] Use a cotton opener to loosen the polyarylsulfone fiber, so that the polyarylsulfone fiber is loosened into a single fiber state under the tearing and hitting of the cotton opener; then put the loosened polyarylsulfone fiber into a carding machine for carding to improve the parallel arrangement degree of the polyarylsulfone fiber and make the polyarylsulfone fiber evenly distributed; then convey the carded polyarylsulfone fiber to a forming curtain through air flow, and under the action of air flow, the polyarylsulfone fiber is randomly distributed on multiple planes to form multiple fiber meshes; then stack the multiple fiber meshes together to form a preform; finally, send the preform into a needle punching machine, and use the puncture action of the needle to entangle the multiple fiber meshes in the preform together to obtain the flame-retardant layer 3 with a stable shape and not easy to deform and shift;

[0082] Step 4: Prepare the heat-insulating layer 4

[0083] ⅰ) Put the PEO fiber, silver-plated fiber and ZnO polyester fiber into a pre-loosening device for pre-loosening respectively to reduce the compactness of the PEO fiber, silver-plated fiber and ZnO polyester fiber;

[0084] ⅱ) Put the pre-loosened PEO fiber, silver-plated fiber and ZnO polyester fiber into a mixed loosening device for loosening and full mixing according to the weight ratio of 2:3:2 to obtain mixed fibers;

[0085] ⅲ) Put the mixed fibers into a carding machine for carding into a net to obtain a mixed fiber net;

[0086] ⅳ) Convey the mixed fiber net to the needle punching area of the needle punching machine for needle punching reinforcement to obtain the three-dimensional heat-insulating layer 4;

[0087] Step 5: Prepare the camouflage and protective material

[0088] Lay the heat-insulating layer 4, flame-retardant layer 3, bulletproof and stab-proof layer 2 and impact-proof layer 1 in sequence from bottom to top, and use polyurethane adhesive to tightly bond each layer to obtain the camouflage and protective material.

[0089] Example 2

[0090] The camouflage and protection material provided in this embodiment has the same overall structure as that in Embodiment 1, that is, it sequentially includes an impact-resistant layer 1, a bulletproof and stab-resistant layer 2, a flame-retardant layer 3, and a heat-insulating layer 4 from the outside to the inside.

[0091] Specifically, for the impact-resistant layer 1, by weight percentage, 48% of phenolic resin, 37% of ultra-high molecular weight polyethylene fiber braid, and 15% of KH550 are selected.

[0092] The bulletproof and stab-resistant layer 2 is composed of 43% of carbon fiber and 57% of aramid fiber by weight percentage.

[0093] The flame-retardant layer 3 uses an arylsulfone fiber braid.

[0094] The heat-insulating layer 4 is a hybrid fiber braid, and the hybrid fiber braid includes PEO fiber, silver-plated fiber, and ZnO polyester fiber, and PEO fiber: silver-plated fiber: ZnO polyester fiber = 2:4:3, and this ratio is the weight ratio.

[0095] The preparation method of the camouflage and protection material in this embodiment includes the following steps:

[0096] Step 1. Prepare the impact-resistant layer 1

[0097] ⅰ) Degumming of the fiber braid: Place the ultra-high molecular weight polyethylene fiber braid in a vacuum furnace and keep it at 85 °C for 30 min to remove the organic matter on the surface of the ultra-high molecular weight polyethylene fiber braid.

[0098] ⅱ) Treatment with coupling agent: Mix KH550, ethanol, and deionized water in a ratio of 1:5.5:1.7 by weight to hydrolyze KH550 to obtain a treatment solution; Immerse the degummed ultra-high molecular weight polyethylene fiber braid in the treatment solution, after ultrasonic oscillation for 25 min, take out the degummed ultra-high molecular weight polyethylene fiber braid and dry it at 80 °C for standby.

[0099] ⅲ) Cut the dried ultra-high molecular weight polyethylene fiber braid according to the designed size to obtain multiple unidirectional cut fiber braids with a size of 60×60 mm; Immerse multiple unidirectional cut fiber braids in phenolic resin for impregnation treatment. After impregnation for 1.5 h, take out multiple unidirectional cut fiber braids and dry them at 80 °C for standby.

[0100] ⅳ) Stack the dried multiple unidirectional cut fiber braids orthogonally so that the silk surfaces of adjacent two unidirectional cut fiber braids are in contact with each other, and then perform planar pressing at 115 °C with a pressing pressure of 8 MPa to make the phenolic resin heat-melt and cure; After pressing for 0.8 h, release the pressure and cool down to obtain the impact-resistant layer 1.

[0101] Step 2. Prepare the bulletproof and stab-resistant layer 2

[0102] i) putting carbon fiber and aramid fiber into a blending device according to a certain proportion, and fully mixing them in the blending device so that the carbon fiber and aramid fiber are evenly distributed to obtain a blended fiber;

[0103] ii) combing the mixed fiber with a carding machine, combing the mixed fiber into a single fiber state through the carding needles on the carding machine, and arranging the mixed fiber into parallel fiber layers; wherein the density of the carding needles of the carding machine is 90 needles / cm 2 , the carding speed of the carding machine is 230r / min, and the carding distance of the carding machine is 0.15mm;

[0104] ⅲ) The fiber thin layer is made into a fiber web by air-laying; the fiber web is sent to a pre-needling machine, and the needles of the pre-needling machine pierce the fiber web up and down to obtain a fiber felt blank; the fiber felt blank is sent to a main needling machine, and the needles of the main needling machine pierce the fiber web up and down to obtain a fiber felt; wherein the air flow velocity of the air-laying machine is 2.2 m / min, the air flow pressure is 0.1 MPa, and the air flow direction is upward blowing and downward suction; the number of needles of the pre-needling machine is 2500, the needling frequency is 550 punctures / min, and the needling density is 90 punctures / cm 2 The needling depth is 8 mm, the number of needling times is 8 times; the number of needles of the main needling machine is 4700, the needling frequency is 1100 punctures / min, and the needling density is 110 punctures / cm 2 , the needling depth is 9 mm, and the number of needling times is 10 times;

[0105] iv) placing the fiber felt in a vacuum furnace and keeping it at 220° C. for 18 min to obtain a bulletproof and stab-proof layer 2;

[0106] Step 3: Prepare flame retardant layer 3

[0107] A cotton opener is used to open the aramid fiber, so that the aramid fiber is loosened into a single fiber state under the tearing and hitting of the cotton opener; then the aramid fiber after opening is placed in a carding machine for carding to improve the parallel arrangement of the aramid fiber and make the aramid fiber evenly distributed; then the carded aramid fiber is transported to a mesh curtain through airflow, and under the action of the airflow, the aramid fiber is randomly distributed on multiple planes to form multiple fiber webs; then the multiple fiber webs are stacked together to form a preform; finally, the preform is sent to a needle punching machine, and the puncture of the needles is used to entangle the multiple fiber webs in the preform, so as to obtain a flame retardant layer 3 with a stable shape and not easy to deform and shift;

[0108] Step 4: Prepare thermal insulation layer 4

[0109] ⅰ) Put the PEO fibers, silver-plated fibers, and ZnO polyester fibers into a pre-opening device respectively for pre-opening to reduce the compactness of the PEO fibers, silver-plated fibers, and ZnO polyester fibers;

[0110] ⅱ) Put the pre-opened PEO fibers, silver-plated fibers, and ZnO polyester fibers into a mixing and opening device according to the weight ratio of 2:4:3 for opening and full mixing to obtain mixed fibers;

[0111] ⅲ) Put the mixed fibers into a carding machine for carding into a web to obtain a mixed fiber web;

[0112] ⅳ) Transport the mixed fiber web to the needling area of a needling machine for needling reinforcement to obtain a heat-insulating layer 4 with a three-dimensional structure;

[0113] Step 5: Prepare the camouflage and protective material

[0114] Lay the heat-insulating layer 4, flame-retardant layer 3, bulletproof and stab-proof layer 2, and impact-proof layer 1 in sequence from bottom to top, and use polyurethane adhesive to tightly bond each layer to obtain the camouflage and protective material.

[0115] Example 3

[0116] The overall structure of the camouflage and protective material provided in this example is the same as that in Example 1, that is, it sequentially includes an impact-proof layer 1, a bulletproof and stab-proof layer 2, a flame-retardant layer 3, and a heat-insulating layer 4 from outside to inside.

[0117] Specifically, for the impact-proof layer 1, by weight percentage, 53% of unsaturated polyester resin, 35% of ultra-high molecular weight polyethylene fiber braid, and 12% of KH560 are selected.

[0118] For the bulletproof and stab-proof layer 2, by weight percentage, it is composed of 48% of carbon nanotube fibers and 52% of aramid fibers.

[0119] The flame-retardant layer 3 uses an arylsulfone fiber braid.

[0120] The heat-insulating layer 4 is a hybrid fiber braid, and the hybrid fiber braid includes PEO fibers, silver-plated fibers, and ZnO polyester fibers, and PEO fiber:silver-plated fiber:ZnO polyester fiber = 3:3:2, and this ratio is the weight ratio.

[0121] The preparation method of the camouflage and protective material in this example includes the following steps:

[0122] Step 1: Prepare the impact-proof layer 1

[0123] ⅰ) Fiber braid degumming: Place the ultra-high molecular weight polyethylene fiber braid in a vacuum furnace and keep it at 90 °C for 25 min to remove the organic matter on the surface of the ultra-high molecular weight polyethylene fiber braid;

[0124] ii) Coupling agent treatment: KH560, ethanol and deionized water are mixed in a weight ratio of 1:6.5:2.5 to hydrolyze KH560 to obtain a treatment solution; the ultra-high molecular weight polyethylene fiber braid after degumming is immersed in the treatment solution, and after ultrasonic vibration for 30 minutes, the ultra-high molecular weight polyethylene fiber braid after degumming is taken out and dried at 80°C for use;

[0125] iii) cutting the dried ultra-high molecular weight polyethylene fiber braids according to the designed size to obtain a plurality of unidirectional cut fiber braids with a size of 60×60 mm; soaking the plurality of unidirectional cut fiber braids in unsaturated polyester resin for dipping, after dipping for 1.8 hours, taking out the plurality of unidirectional cut fiber braids, drying them at 80° C. for later use;

[0126] iv) stacking a plurality of dried and ready-to-use unidirectional cut fiber braids orthogonally so that the yarn surfaces of two adjacent unidirectional cut fiber braids are in contact with each other, and then performing plane pressurization at 120° C. with a pressurization pressure of 6 MPa to heat and melt the unsaturated polyester resin and solidify it; after pressurization for 1 hour, releasing the pressure and cooling to obtain an impact-proof layer 1;

[0127] Step 2: Prepare the bulletproof and stab-proof layer 2

[0128] i) placing carbon nanotube fibers and aramid fibers in a proportion into a blending device, and fully mixing them in the blending device so that the carbon nanotube fibers and aramid fibers are evenly distributed to obtain blended fibers;

[0129] ii) combing the mixed fiber with a carding machine, combing the mixed fiber into a single fiber state through the carding needles on the carding machine, and arranging the mixed fiber into parallel fiber layers; wherein the density of the carding needles of the carding machine is 100 needles / cm 2 , the carding speed of the carding machine is 250r / min, and the carding distance of the carding machine is 0.2mm;

[0130] ⅲ) The fiber thin layer is made into a fiber web by air-laying; the fiber web is fed into a pre-needling machine, and the needles of the pre-needling machine pierce the fiber web up and down to obtain a fiber felt blank; the fiber felt blank is fed into a main needling machine, and the needles of the main needling machine pierce the fiber web up and down to obtain a fiber felt; wherein the air flow velocity of the air-laying is 2.5 m / min, the air flow pressure is 0.15 MPa, and the air flow direction is upward blowing and downward suction; the number of needles of the pre-needling machine is 2300, the needling frequency is 600 punctures / min, and the needling density is 85 punctures / cm 2 The needling depth is 7.5 mm, the number of needling times is 5 times; the number of needles of the main needling machine is 4800, the needling frequency is 1150 needles / min, and the needling density is 120 needles / cm 2 , the needling depth is 8mm, and the number of needling times is 12 times;

[0131] iv) Place the fiber felt in a vacuum furnace, keep it at 250 °C for 15 min to obtain the bulletproof and stab-resistant layer 2;

[0132] Step 3: Prepare the flame-retardant layer 3

[0133] Use a cotton opener to loosen the polyarylsulfone fiber, so that the polyarylsulfone fiber is loosened into a single fiber state under the tearing and hitting of the cotton opener; then put the loosened polyarylsulfone fiber into a carding machine for carding to improve the parallel arrangement degree of the polyarylsulfone fiber and make the polyarylsulfone fiber evenly distributed; then convey the carded polyarylsulfone fiber to a forming curtain through air flow. Under the action of the air flow, the polyarylsulfone fiber is randomly distributed on multiple planes to form multiple fiber meshes; then stack the multiple fiber meshes together to form a preform; finally, send the preform into a needling machine, and use the puncture action of the needle to entangle the multiple fiber meshes in the preform together to obtain the flame-retardant layer 3 with a stable shape and not easy to deform and shift;

[0134] Step 4: Prepare the heat-insulating layer 4

[0135] i) Put the PEO fiber, silver-plated fiber and ZnO polyester fiber into a pre-loosening device for pre-loosening respectively to reduce the compactness of the PEO fiber, silver-plated fiber and ZnO polyester fiber;

[0136] ii) Put the pre-loosened PEO fiber, silver-plated fiber and ZnO polyester fiber into a mixing and loosening device according to the weight ratio of 3:3:2 for loosening and full mixing to obtain mixed fibers;

[0137] iii) Put the mixed fibers into a carding machine for carding and forming to obtain a mixed fiber mesh;

[0138] iv) Convey the mixed fiber mesh to the needling area of the needling machine for needling reinforcement to obtain the three-dimensional heat-insulating layer 4;

[0139] Step 5: Prepare the camouflage and protective material

[0140] Lay the heat-insulating layer 4, flame-retardant layer 3, bulletproof and stab-resistant layer 2 and impact-resistant layer 1 in sequence from bottom to top, and use polyurethane adhesive to tightly bond each layer to obtain the camouflage and protective material.

[0141] Example 4

[0142] The overall structure of the camouflage and protective material provided in this example is the same as that in Example 1, that is, it sequentially includes an impact-resistant layer 1, a bulletproof and stab-resistant layer 2, a flame-retardant layer 3 and a heat-insulating layer 4 from outside to inside.

[0143] Specifically, the impact-proof layer 1 is composed of 58% polyetheretherketone resin, 30% ultra-high molecular weight polyethylene fiber braid and 12% KH560 by weight.

[0144] The bulletproof and stab-proof layer 2 is composed of 43% silicon carbide fibers and 57% aramid fibers by weight.

[0145] The flame retardant layer 3 is made of a braided body of aromatic sulfone fibers.

[0146] The heat insulating layer 4 is a mixed fiber braid, which includes PEO fiber, silver-plated fiber and ZnO polyester fiber, and the ratio of PEO fiber: silver-plated fiber: ZnO polyester fiber is 4:3.5:3, which is a weight ratio.

[0147] The preparation method of the camouflage protection material in this embodiment includes the following steps:

[0148] Step 1: Prepare the impact-proof layer 1

[0149] i) Fiber braid debonding: placing the ultra-high molecular weight polyethylene fiber braid in a vacuum oven and keeping it at 95° C. for 20 minutes to remove organic matter on the surface of the ultra-high molecular weight polyethylene fiber braid;

[0150] ii) Coupling agent treatment: KH560, ethanol and deionized water are mixed in a weight ratio of 1:7:2.5 to hydrolyze KH560 to obtain a treatment solution; the ultra-high molecular weight polyethylene fiber braid after degumming is immersed in the treatment solution, and after ultrasonic vibration for 30 minutes, the ultra-high molecular weight polyethylene fiber braid after degumming is taken out and dried at 80°C for use;

[0151] iii) cutting the dried ultra-high molecular weight polyethylene fiber braids according to the designed size to obtain a plurality of unidirectional cut fiber braids with a size of 60×60 mm; soaking the plurality of unidirectional cut fiber braids in polyetheretherketone resin for dipping, and after dipping for 2 hours, taking out the plurality of unidirectional cut fiber braids and drying them at 80° C. for use;

[0152] iv) stacking a plurality of dried and ready-to-use unidirectional cut fiber braids orthogonally so that the yarn surfaces of two adjacent unidirectional cut fiber braids are in contact with each other, and then performing plane pressurization at 125° C. with a pressurization pressure of 7 MPa to heat and melt the polyetheretherketone resin and solidify it; after pressurization for 1.5 hours, releasing the pressure and cooling down to obtain an impact-proof layer 1;

[0153] Step 2: Prepare the bulletproof and stab-proof layer 2

[0154] i) putting silicon carbide fiber and aramid fiber into a cotton blending device according to a certain proportion, and fully mixing them in the cotton blending device so that the silicon carbide fiber and the aramid fiber are evenly distributed to obtain mixed fiber;

[0155] ⅱ) Card the mixed fibers using a carding machine. Comb the mixed fibers into single fiber state through the needles on the carding machine and arrange them into a parallel fiber thin layer. Among them, the needle density of the carding machine is 110 needles / cm 2 , the carding speed of the carding machine is 270 r / min, and the carding gauge of the carding machine is 0.2 mm;

[0156] ⅲ) Use the air-laying method to make the fiber thin layer into a fiber web. Feed the fiber web into a pre-punching machine. The punching needles of the pre-punching machine penetrate up and down in the fiber web to obtain a fiber felt blank. Feed the fiber felt blank into the main punching machine. The punching needles of the main punching machine penetrate up and down in the fiber web to obtain a fiber felt. Among them, the air speed of the air-laying is 3 m / min, the air pressure is 0.07 MPa, and the air flow direction is blowing from top to sucking at the bottom; the number of needles of the pre-punching machine is 2700, the punching frequency is 700 punches / min, and the punching density is 100 punches / cm 2 , the punching depth is 9 mm, and the number of punching passes is 6 passes; the number of needles of the main punching machine is 5000, the punching frequency is 1200 punches / min, and the punching density is 135 punches / cm 2 , the punching depth is 9 mm, and the number of punching passes is 13 passes;

[0157] ⅳ) Place the fiber felt in a vacuum furnace and keep it at 300 °C for 10 min to obtain the bulletproof and stab-proof layer 2;

[0158] Step 3: Prepare the flame-retardant layer 3

[0159] Use a bale opener to loosen the meta-aramid fiber. Under the tearing and hitting of the bale opener, the meta-aramid fiber is loosened into single fiber state. Then put the loosened meta-aramid fiber into a carding machine for carding to improve the parallel arrangement degree of the meta-aramid fiber and make the meta-aramid fiber evenly distributed. Then convey the carded meta-aramid fiber to the forming curtain through air flow. Under the action of air flow, the meta-aramid fiber is randomly distributed on multiple planes to form multiple fiber webs. Then stack the multiple fiber webs together to form a preform. Finally, feed the preform into a punching machine and use the piercing action of the punching needles to entangle the multiple fiber webs in the preform together to obtain the flame-retardant layer 3 with stable shape and not easy to deform and shift;

[0160] Step 4: Prepare the heat-insulating layer 4

[0161] ⅰ) Put the PEO fiber, silver-plated fiber and ZnO polyester fiber into a pre-loosening device for pre-loosening respectively to reduce the compactness of the PEO fiber, silver-plated fiber and ZnO polyester fiber;

[0162] ii) Put the pre-opened PEO fibers, silver-plated fibers, and ZnO polyester fibers into a mixing and opening device according to a weight ratio of 4:3.5:3 for opening and thorough mixing to obtain mixed fibers;

[0163] iii) Put the mixed fibers into a carding machine for carding into a web to obtain a mixed fiber web;

[0164] iv) Transport the mixed fiber web to the needling area of a needling machine for needling reinforcement to obtain a heat-insulating layer 4 with a three-dimensional structure;

[0165] Step 5: Prepare the camouflage and protection material

[0166] Lay the heat-insulating layer 4, the flame-retardant layer 3, the bulletproof and stab-proof layer 2, and the shock-proof layer 1 in sequence from bottom to top, and use polyurethane adhesive to tightly bond each layer to obtain the camouflage and protection material.

[0167] Example 5

[0168] The overall structure of the camouflage and protection material provided in this example is the same as that in Example 1, that is, it sequentially includes a shock-proof layer 1, a bulletproof and stab-proof layer 2, a flame-retardant layer 3, and a heat-insulating layer 4 from outside to inside.

[0169] Specifically, for the shock-proof layer 1, by weight percentage, 65% of polyimide resin, 32% of ultra-high molecular weight polyethylene fiber braid, and 3% of KH590 are selected.

[0170] For the bulletproof and stab-proof layer 2, by weight percentage, it is composed of 55% of polyaniline fibers and 45% of aramid fibers.

[0171] The flame-retardant layer 3 uses an aromatic sulfone aramid fiber braid.

[0172] The heat-insulating layer 4 is a hybrid fiber braid, and the hybrid fiber braid includes PEO fibers, silver-plated fibers, and ZnO polyester fibers, and PEO fiber:silver-plated fiber:ZnO polyester fiber = 5:4:4, and this ratio is the weight ratio.

[0173] The preparation method of the camouflage and protection material in this example includes the following steps:

[0174] Step 1: Prepare the shock-proof layer 1

[0175] i) Degumming of the fiber braid: Place the ultra-high molecular weight polyethylene fiber braid in a vacuum furnace and keep it at 100 °C for 15 min to remove the organic matter on the surface of the ultra-high molecular weight polyethylene fiber braid;

[0176] ii) Coupling agent treatment: KH590, ethanol and deionized water are mixed in a weight ratio of 1:7:3 to hydrolyze KH590 to obtain a treatment solution; the ultra-high molecular weight polyethylene fiber braid after degumming is immersed in the treatment solution, and after ultrasonic vibration for 30 minutes, the ultra-high molecular weight polyethylene fiber braid after degumming is taken out and dried at 80°C for use;

[0177] iii) cutting the dried ultra-high molecular weight polyethylene fiber braids according to the designed size to obtain a plurality of unidirectional cut fiber braids with a size of 60×60 mm; soaking the plurality of unidirectional cut fiber braids in polyimide resin for dipping, and after dipping for 3 hours, taking out the plurality of unidirectional cut fiber braids and drying them at 80° C. for use;

[0178] iv) stacking a plurality of dried and ready-to-use unidirectional cut fiber braids orthogonally so that the yarn surfaces of two adjacent unidirectional cut fiber braids are in contact with each other, and then performing plane pressurization at 130° C. with a pressurization pressure of 5 MPa to heat and melt the polyimide resin and solidify it; after pressurization for 2 hours, releasing the pressure and cooling down to obtain an impact-proof layer 1;

[0179] Step 2: Prepare the bulletproof and stab-proof layer 2

[0180] i) placing polyaniline fiber and aramid fiber in a proportion into a cotton blending device, and fully mixing them in the cotton blending device so that the polyaniline fiber and the aramid fiber are evenly distributed to obtain a mixed fiber;

[0181] ii) combing the mixed fiber with a carding machine, combing the mixed fiber into a single fiber state through the carding needles on the carding machine, and arranging the mixed fiber into parallel fiber layers; wherein the density of the carding needles of the carding machine is 120 needles / cm 2 , the carding speed of the carding machine is 300r / min, and the carding distance of the carding machine is 0.25mm;

[0182] ⅲ) The fiber thin layer is made into a fiber web by air-laying; the fiber web is sent to a pre-needling machine, and the needles of the pre-needling machine pierce the fiber web up and down to obtain a fiber felt blank; the fiber felt blank is sent to a main needling machine, and the needles of the main needling machine pierce the fiber web up and down to obtain a fiber felt; wherein the air flow velocity of the air-laying is 2.5 m / min, the air flow pressure is 0.1 MPa, and the air flow direction is upward blowing and downward suction; the number of needles of the pre-needling machine is 3000, the needling frequency is 800 punctures / min, and the needling density is 120 punctures / cm 2 The needling depth is 10 mm, the number of needling times is 8 times; the number of needles of the main needling machine is 5000, the needling frequency is 1100 needles / min, and the needling density is 150 needles / cm 2 , the needling depth is 10 mm, and the number of needling times is 15 times;

[0183] ⅳ) Place the fiber felt in a vacuum furnace and keep it at 300 °C for 15 min to obtain the bulletproof and stab-resistant layer 2;

[0184] Step 3: Prepare the flame-retardant layer 3

[0185] Use a cotton opener to loosen the meta-aramid fiber. Under the tearing and hitting of the cotton opener, the meta-aramid fiber is loosened into a single fiber state; then put the loosened meta-aramid fiber into a carding machine for carding to improve the parallel arrangement degree of the meta-aramid fiber and make the meta-aramid fiber evenly distributed; then convey the carded meta-aramid fiber to a forming curtain through air flow. Under the action of the air flow, the meta-aramid fiber is randomly distributed on multiple planes to form multiple fiber meshes; then stack the multiple fiber meshes together to form a preform; finally, send the preform into a needle punching machine, and use the puncture action of the needle to entangle the multiple fiber meshes in the preform together to obtain the flame-retardant layer 3 with a stable shape and not prone to deformation and displacement;

[0186] Step 4: Prepare the heat-insulating layer 4

[0187] ⅰ) Put the PEO fiber, silver-plated fiber and ZnO polyester fiber into a pre-loosening device for pre-loosening respectively to reduce the compactness of the PEO fiber, silver-plated fiber and ZnO polyester fiber;

[0188] ⅱ) Put the pre-loosened PEO fiber, silver-plated fiber and ZnO polyester fiber into a mixing and loosening device according to the weight ratio of 5:4:4 for loosening and full mixing to obtain mixed fibers;

[0189] ⅲ) Put the mixed fibers into a carding machine for carding and forming to obtain a mixed fiber mesh;

[0190] ⅳ) Convey the mixed fiber mesh to the needle punching area of the needle punching machine for needle punching reinforcement to obtain the three-dimensional heat-insulating layer 4;

[0191] Step 5: Prepare the camouflage and protective material

[0192] Lay the heat-insulating layer 4, flame-retardant layer 3, bulletproof and stab-resistant layer 2 and impact-resistant layer 1 in sequence from bottom to top, and use polyurethane adhesive to tightly bond each layer to obtain the camouflage and protective material.

[0193] Performance test

[0194] In order to verify the efficacy of the camouflage and protective materials prepared in Examples 1-5 of the present invention, the inventors respectively carried out anti-fragment simulating bullet performance tests, combustion performance tests, radar reflectivity tests and surface radiation temperature difference tests according to GB / T32497, GB / T 8924, GJB 2038A-2011 and GJB 5251-2004. The test results are shown in Table 1, Table 2, Table 3 and Table 4 respectively:

[0195] Table 1 Ballistic performance test results of the camouflage protective materials prepared in Examples 1-5

[0196]

[0197] Table 2 Oxygen index test results of the camouflage protective materials prepared in Examples 1-5

[0198] Embodiment 1 2 3 4 5 Oxygen index 30.2 32.6 35.1 33.7 38.2

[0199] Table 3 Reflectivity test results of the camouflage protective materials prepared in Examples 1-5

[0200]

[0201] Table 4 Average radiation temperature difference test results of the camouflage protective materials prepared in Examples 1-5

[0202]

[0203] From the test results in Table 1 to Table 4, it can be seen that the camouflage protective materials prepared in Examples 1-5 of the present invention show excellent performance in anti-impact performance. For 3g fragment projectiles, they exhibit excellent anti-penetration ability under different steel plate thicknesses and projectile speeds, effectively blocking the invasion of high-speed fragments; they have good flame retardant performance, with oxygen indices all greater than 30, indicating that the material has strong flame retardant ability in a combustion environment and can significantly inhibit flame spread; they have outstanding radar stealth performance, with a low average reflectivity in the 8-18 GHz frequency band, which can effectively reduce the probability of being detected by radar; their infrared stealth performance is also excellent, with a small temperature difference from the background at different time points, meaning that the material can better blend into the environment and reduce the possibility of being identified by infrared thermal imaging equipment. Generally speaking, the camouflage protective materials prepared by the present invention have successfully achieved the synergistic effect of multiple functions such as anti-impact, flame retardant, heat insulation, and infrared / radar stealth, meeting the stringent requirements for protective materials in complex environments.

[0204] The above are only specific embodiments of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention.

[0205] It should be understood that the present invention is not limited to the above-described content and can be variously modified and changed without departing from its scope. The scope of the present invention is only limited by the appended claims.

Claims

1. A kind of camouflage protection material, characterized in that, The camouflage protection material sequentially includes an impact-resistant layer, a bulletproof and stab-resistant layer, a flame-retardant layer, and a heat-insulating layer from outside to inside; Among them, the impact-resistant layer, by weight percentage, includes 40% - 65% of resin, 30% - 42% of fiber braid, and 3% - 18% of coupling agent; The bulletproof and stab-resistant layer, by weight percentage, includes 40% - 55% of conductive fiber and 45% - 60% of aramid fiber; The flame-retardant layer is an arylsulfone fiber braid; The heat-insulating layer is a hybrid fiber braid, and the hybrid fiber braid includes PEO fiber, silver-plated fiber, and ZnO polyester fiber.

2. The camouflage protection material according to claim 1, wherein The resin in the impact-resistant layer is selected from one of epoxy resin, phenolic resin, unsaturated polyester resin, polyether ether ketone resin, and polyimide resin.

3. The camouflage protection material according to claim 1, characterized in that, The fiber braid in the impact-resistant layer is a ultra-high molecular weight polyethylene fiber braid with a molecular weight greater than 1 million.

4. The camouflage protection material according to claim 1, wherein The coupling agent in the impact-resistant layer is selected from one of KH550, KH560, and KH590.

5. The camouflage protection material according to claim 1, characterized in that, The conductive fiber in the bulletproof and stab-resistant layer is selected from one of nickel fiber, carbon fiber, carbon nanotube fiber, silicon carbide fiber, and polyaniline fiber.

6. The camouflage protection material according to claim 1, characterized in that, In the heat-insulating layer, the weight ratio of PEO fiber, silver-plated fiber to ZnO polyester fiber is (2 - 5) : (3 - 4) : (2 - 4).

7. A method for preparing the camouflage protection material according to any one of claims 1 to 6, characterized in that, The preparation method includes the following steps: Step 1, prepare the impact-resistant layer ⅰ) Use a vacuum furnace to remove the organic matter on the surface of the fiber braid by vacuum heat treatment; ⅱ) Mix the coupling agent, ethanol, and deionized water in a set ratio to hydrolyze the coupling agent to obtain a treatment solution; Immerse the fiber braid with removed organic matter in the treatment solution, after ultrasonic oscillation for 20 min - 40 min, take out the fiber braid and dry it for standby; ⅲ) Cut the dried and standby fiber braid according to the designed size to obtain multiple unidirectionally cut fiber braids; Immerse the multiple unidirectionally cut fiber braids in resin for sizing treatment, after sizing for 1 h - 3 h, take out the multiple unidirectionally cut fiber braids and dry them for standby; ⅳ) Orthogonally stack the multiple dried and standby unidirectionally cut fiber braids so that the silk surfaces of adjacent two unidirectionally cut fiber braids are in contact with each other, and then apply planar pressure at a set temperature to make the resin heat-melt and cure; After pressurizing for 0.5 h - 2 h, release the pressure and cool down to obtain the impact-resistant layer; Step 2, prepare the bulletproof and stab-resistant layer ⅰ) Put the conductive fiber and aramid fiber into a cotton mixing device in proportion to mix them evenly to obtain mixed fibers; ⅱ) Use a carding machine to card the mixed fibers, and the carding needles on the carding machine card the mixed fibers into a single fiber state and arrange them into a parallel fiber thin layer; ⅲ) Use the air-laying method to make the fiber thin layer into a fiber web; Send the fiber web into a pre-needling machine, and the needles of the pre-needling machine pierce up and down in the fiber web to obtain a fiber felt blank; Send the fiber felt blank into the main needling machine, and the needles of the main needling machine pierce up and down in the fiber web to obtain a fiber felt; ⅳ) Use a vacuum furnace to perform heat treatment on the fiber felt by vacuum heat treatment method to obtain the bulletproof and stab-resistant layer; Step 3: Prepare the flame-retardant layer First, loosen, card, form a web, and lay the web of aromatic poly-sulfone amide fiber, and then perform multiple needle punching to fix the web to obtain the flame-retardant layer; Step 4: Prepare the heat-insulating layer ⅰ) Put the PEO fiber, silver-plated fiber, and ZnO polyester fiber into a pre-loosening device respectively for pre-loosening to reduce the compactness of the PEO fiber, the silver-plated fiber, and the ZnO polyester fiber; ⅱ) Put the pre-loosened PEO fiber, silver-plated fiber, and ZnO polyester fiber into a mixing and loosening device in proportion for loosening and full mixing to obtain mixed fibers; ⅲ) Put the mixed fibers into a carding machine for carding into a web to obtain a mixed fiber web; ⅳ) Transport the mixed fiber web to the needle punching area of a needle punching machine for needle punching reinforcement to obtain a three-dimensional heat-insulating layer; Step 5: Prepare the camouflage and protective material Lay the heat-insulating layer, the flame-retardant layer, the bulletproof and stab-proof layer, and the impact-proof layer in sequence from bottom to top, and use polyurethane adhesive to tightly bond each layer to obtain the camouflage and protective material.

8. The preparation method according to claim 7, characterized in that, In Step 1, the parameters during the vacuum heat treatment are set as follows: the temperature is 80°C to 100°C, and the time is 15 min to 30 min; The weight ratio of the coupling agent, ethanol, and deionized water is 1:(5 - 7):(1.5 - 3); The parameters during the flat pressing are set as follows: the temperature is 110°C to 130°C, and the pressure is 5 MPa to 10 MPa.

9. The preparation method according to claim 7, wherein, In Step 2, the parameters of the carding machine are set as follows: the needle density is 80 needles / cm 2 to 120 needles / cm 2 , the carding speed is 200 r / min to 300 r / min, and the carding gauge is 0.1 mm to 0.25 mm; The parameters of the air-laid process are set as follows: the air flow rate is 2 m / min to 3 m / min, the air flow pressure is 0.05 MPa to 0.15 MPa, and the air flow direction is blowing from top to bottom and sucking from bottom to top; The parameters of the pre-needling machine are set as follows: the number of needles is 2,000 to 3,000, the needling frequency is 500 to 800 needles / min, the needling density is 80 to 120 needles / cm 2 ~120 needles / cm 2 , the needling depth is 7 to 10 mm, and the number of needling passes is 5 to 10 times; The parameters of the main needling machine are set as follows: the number of needles is 4,600 - 5,000 needles, the needling frequency is 1,000 - 1,200 needles / min, the needling density is 100 - 150 needles / cm 2 ~150 needles / cm 2 , the needling depth is 7 - 10 mm, and the number of needling passes is 7 - 15 passes; The parameters of the vacuum heat treatment are set as follows: the temperature is 200°C to 300°C, and the time is 10 min to 20 min.

10. Application of a camouflage protection material, characterized in that, The camouflage and protective material is the camouflage and protective material according to any one of claims 1 to 6, or the camouflage and protective material prepared by using the preparation method according to any one of claims 7 to 9. The camouflage and protective material is applied to the field of military equipment protection or civil protection.

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