Infrared stealth coating fabric with low infrared emissivity

Abstract

The utility model discloses an infrared stealth coating fabric with low infrared emissivity, which comprises a base cloth layer and a surface fabric layer arranged on the base cloth layer, an infrared stealth coating is arranged on the surface fabric layer in a blade coating mode, an elastic heat insulation layer is arranged between the base cloth layer and the surface fabric layer, and the elastic heat insulation layer is arranged between the base cloth layer and the surface fabric layer. The elastic heat insulation layer comprises a bottom non-woven fabric layer and a top non-woven fabric layer which are sequentially stacked from top to bottom, a first filler layer composed of a plurality of hollow microbead particles is evenly scattered on the surface of the bottom non-woven fabric layer, and an adhesive layer used for fixing the first filler layer and the bottom non-woven fabric layer is sprayed on the surface of the first filler layer. A second filler layer composed of a plurality of hollow microbead particles is scattered on the surface of the adhesive layer, and the top non-woven fabric layer and the bottom non-woven fabric layer are fixed. The soft performance of the fabric is improved, the fabric has long-term infrared stealth performance, the heat conductivity coefficient is obviously reduced to achieve the purpose of blocking heat conduction, and the comprehensive infrared stealth performance of the fabric is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of functional textiles, in particular to an infrared stealth coating fabric with low infrared emissivity. Background Art

[0002] With the rapid development of infrared detection technology, the development of infrared stealth materials has become an urgent need. The infrared stealth effect is affected by both temperature and infrared emissivity. Thermal infrared stealth materials can achieve the infrared stealth function of the target object by reducing the surface infrared emissivity or temperature. However, as the accuracy of infrared detection instruments continues to improve, the requirements for infrared stealth materials are also getting higher and higher. The single control method of reducing infrared emissivity or surface temperature can no longer meet the infrared stealth requirements of high-temperature objects.

[0003] Infrared stealth technology is to reduce or change the target's own infrared radiation intensity and characteristics through measures such as shielding, heat suppression, and low-emissivity coatings, so as to achieve the target's stealth purpose. As a type of stealth material technology, infrared stealth functional textiles have the characteristics of simple construction, low cost, strong adaptability, and flexibility. And with the improvement of detection technology accuracy and the use of a variety of cutting-edge detection technologies on the battlefield, the research work on infrared stealth coatings is required to develop in the direction of multi-band broadband. For example: visible light / near infrared / infrared multi-band stealth materials.

[0004] At present, most stealth textiles are processed by coating method, which not only has a significant impact on the wearing properties of the fabric itself (such as softness); and most of the existing infrared stealth coatings use pure metal powder as filler, but metal easily forms an oxide layer on the surface, which will increase the infrared emissivity of the coating, thereby reducing the concealment effect; at the same time, simply reducing the surface infrared emissivity while ignoring the thermal conductivity is also an important factor affecting the infrared stealth effect.

[0005] To sum up, how to further improve the softness of the fabric on the basis of the existing coated fabric, make the fabric have long-lasting infrared stealth performance, significantly reduce the thermal conductivity to achieve the purpose of blocking heat conduction, and effectively improve the comprehensive infrared stealth performance of the fabric has become a difficult problem that technicians in this field urgently need to solve. Summary of the invention

[0006] In view of the deficiencies in the prior art, the technical problem to be solved by the utility model is to provide an infrared stealth coating fabric with low infrared emissivity, which improves the softness of the fabric, has long-lasting infrared stealth performance, and significantly reduces the thermal conductivity to achieve the purpose of blocking heat conduction.

[0007] In order to solve the above technical problems, the technical solution adopted by the utility model is: an infrared stealth coating fabric with low infrared emissivity, the fabric comprising a base fabric layer, and a surface fabric layer arranged on the base fabric layer, an infrared stealth coating is scraped on the surface fabric layer, an elastic insulation layer is arranged between the base fabric layer and the surface fabric layer, the elastic insulation layer comprises a bottom layer and a top layer of non-woven fabric layers stacked in sequence, a first filler layer composed of a plurality of hollow micro-bead particles is evenly sprinkled on the surface of the bottom non-woven fabric layer, an adhesive layer for fixing the first filler layer to the bottom non-woven fabric layer is sprayed on the surface of the first filler layer, a second filler layer composed of a plurality of hollow micro-bead particles is sprinkled on the surface of the adhesive layer, and the top non-woven fabric layer is fixed to the bottom non-woven fabric layer.

[0008] In the above infrared stealth coating fabric with low infrared emissivity, the thickness of the hollow microbead particles between the bottom layer and the top layer of non-woven fabric is 20%-30% of the thickness of the bottom layer or the top layer of non-woven fabric.

[0009] The above-mentioned infrared stealth coating fabric with low infrared emissivity, the hollow microsphere particles are hollow glass microspheres with a density of 0.3-0.5g / cm 3 , particle size is 30~80um.

[0010] The infrared stealth coating fabric with low infrared emissivity is characterized in that the first filler layer and the second filler layer are respectively fixed by winding up and down the needle-punched fibers of the bottom non-woven fabric and the top non-woven fabric.

[0011] The infrared stealth coating fabric with low infrared emissivity has a heat-insulating coating sprayed on the surface of the top non-woven fabric layer, and the thickness of the heat-insulating coating is 0.1-0.5 mm.

[0012] The infrared stealth coating fabric with low infrared emissivity has a scraping thickness of 0.3-0.5 mm on the surface fabric layer.

[0013] The infrared stealth coating fabric with low infrared emissivity is sprayed with a protective layer on the surface of the infrared stealth coating.

[0014] The advantages of the infrared stealth coating fabric with low infrared emissivity of the utility model are: an elastic heat-insulating layer is provided, which greatly reduces the amount of infrared stealth coating scraped on the surface of the surface fabric layer, and improves the softness of the fabric compared with the traditional stealth fabric. Through needle-punching reinforcement, the hollow glass beads are firmly locked in the two layers of non-woven fabrics. The hollow microbead particle structure in the first filler layer and the second filler layer hinders the heat transfer perpendicular to the channel direction, and can isolate the transmission of most of the heat of the human body, thereby improving the heat insulation effect. Not only can it significantly reduce the infrared emissivity of the target, but also has good durability. The utility model realizes physical isolation from a structural perspective, reduces production costs, and the fabric layers have high bonding strength, excellent air permeability, and good wearing comfort. It can improve the work efficiency of soldiers and special operations personnel, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is an enlarged schematic diagram of the cross-sectional structure of the composite fabric of the utility model;

[0016] Figure 2 It is an enlarged view of the cross-sectional structure of the elastic thermal insulation layer;

[0017] Figure 3 It is a schematic diagram of the overall structure of the elastic thermal insulation layer;

[0018] Figure 4 for Figure 2 A magnified view of the local structure of part A;

[0019] Figure 5 It is a schematic diagram of the structure in which the first filler layer and the second filler layer are reinforced by needle punching. DETAILED DESCRIPTION

[0020] The utility model is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] like Figure 1 As shown, an infrared stealth coating fabric with low infrared emissivity comprises a base fabric layer 1, and a surface fabric layer 2 arranged on the base fabric layer 1, and an infrared stealth coating 3 is scraped on the surface fabric layer 2. The scraping thickness of the infrared stealth coating 3 on the surface fabric layer 1 is 0.3-0.5mm. Among them, the base fabric layer 1 and the surface fabric layer 2 can be textile fabrics of any form and any material. Any form such as woven or knitted fabric, any material such as natural fiber, synthetic fiber or regenerated cellulose fiber. The infrared stealth coating used in the utility model can be selected from a slurry made of a polymer matrix material and a low infrared emissivity powder, such as a mixture of polyethylene or polyethylene terephthalate and aluminum-doped zinc oxide, or a commonly used slurry such as graphene and MXene for scraping.

[0022] In order to solve the problem that traditional metals easily form an oxide layer on the surface, which leads to an increase in the infrared emissivity of the coating and thus reduces the concealment effect, the utility model sprays a protective layer 4 on the surface of the infrared stealth coating 3. The protective layer 4 can be made of acrylic or polyurethane materials. After the polyurethane material is applied, the fabric feels full and elastic, and the surface has a film feel. After the acrylic material is applied, the fabric can increase the feel, be windproof, and have a drape. The specific selection can be based on the actual application of the fabric. At the same time, in order to reasonably control the overall thickness of the fabric and improve the wearability of the fabric, the spraying thickness is selected to be 0.1-0.2mm.

[0023] like Figure 2 , 3 As shown in Figure 4, an elastic heat-insulating layer 4 is arranged between the base fabric layer 1 and the surface fabric layer 2. The elastic heat-insulating layer 4 includes a bottom non-woven fabric layer 5 and a top non-woven fabric layer 6 stacked up and down. A first filler layer 8 composed of a plurality of hollow micro-bead particles 7 is evenly sprinkled on the surface of the bottom non-woven fabric layer 5. An adhesive layer 9 for fixing the first filler layer 8 to the bottom non-woven fabric 5 is sprayed on the surface of the first filler layer 8. The adhesive layer 9 is a polyurethane adhesive. A second filler layer 10 composed of a plurality of hollow micro-bead particles 7 is sprinkled on the surface of the adhesive layer 9. The top non-woven fabric layer 6 and the bottom non-woven fabric layer 5 are fixed by needle puncture. In this embodiment, the hollow micro-bead particles 7 are hollow glass micro-beads with a density of 0.3-0.5g / cm 3 The particle size is 30-80 μm. The thickness of the hollow microbead particles is 20%-30% of the thickness of the bottom non-woven fabric layer 5 or the top non-woven fabric layer 6.

[0024] In order to control the surface temperature of the fabric, the utility model adopts the means of thermal isolation and adopts hollow microspheres as the heat insulation material. Hollow glass microspheres are a hollow spherical powder with excellent performance and ultra-light inorganic non-metallic new material, which is composed of inorganic materials. According to the chemical composition, they are: silicon dioxide, aluminum oxide, zirconium oxide, magnesium oxide, sodium silicate, etc. It has the advantages of light weight, large volume, and low thermal conductivity. Hollow glass microspheres are used as the first filler layer 8 and the second filler layer 10. The hollow microsphere particles 7 in the first filler layer can be firmly fixed on the surface of the bottom non-woven fabric layer 5 through the adhesive layer 9, and some of the hollow microsphere particles 7 can enter the bottom non-woven fabric layer 5 through the surface of the bottom non-woven fabric layer 5. At the same time, the hollow microsphere particles 7 forming the second filler layer 10 can adhere to the surface of the adhesive layer 9, and the double-layer fixation and setting are realized inside the elastic heat insulation layer 4. Since hollow glass microspheres have ultra-micro pores and hollow structures, they will form a hollow air layer with the substrate surface to block heat conduction. Due to their honeycomb hollow structure, they achieve low thermal conductivity and prevent the coated fabric from dissipating heat quickly. Using them as fillers can significantly reduce the heat conduction of the target, thereby effectively reducing the infrared radiation energy of the target. This special layered stacked microstructure is conducive to heat transfer in the direction parallel to the channel, hinders heat transfer perpendicular to the channel, can isolate most of the heat transfer of the human body, and thus improve the thermal insulation effect, providing the system surface with extremely low infrared emissivity.

[0025] In order to further achieve the purpose of heat insulation and air permeability, a heat insulation coating 11 is sprayed on the surface of the top non-woven fabric layer 6. The heat insulation coating 11 can be made of polyethylene material with good elasticity and air permeability, and the thickness of the heat insulation coating is 0.1-0.5mm. By setting the heat insulation coating 11, the strength of the inner part of the fabric is further improved.

[0026] like Figure 5 As shown, the first filler layer and the second filler layer are respectively fixed by winding the bottom non-woven fabric and the top non-woven fabric with needle-punched fibers up and down. This structure can firmly lock the hollow micro-bead particles 7 inside the elastic heat-insulating layer 4, achieving its long-term heat-insulating effect.

[0027] In addition, the bottom nonwoven fabric layer 5 and the top nonwoven fabric layer 6 can be made of cotton fibers with strong air permeability, or cotton blended fibers. Blended YarnWoven electromagnetic shielding fabric is an effective method for electromagnetic wave shielding. Therefore, in order to further reduce the infrared emissivity, a certain amount of metal short fibers can be added to the fibers for mixed laying, for example, stainless steel fibers and nickel fibers with a fiber diameter of about 4 to 10 μm with low conductivity, or conductive polymer polyaniline (PANI). Since the bottom non-woven fabric layer 5 and the top non-woven fabric layer 6 are coated inside the surface fabric layer 2, the metal fibers are added in a non-woven form to solve the problems of metal fibers having a hard feel, a large friction coefficient, a high density, strong rigidity, poor toughness, curling, elasticity, and poor cohesion. At the same time, it avoids the problem that the metal has a high reflectivity in the visible range and thus reduces the visual camouflage effect, and achieves the purpose of low emissivity.

[0028] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Any changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention should fall within the protection scope of the present invention.

Claims

1. An infrared stealth coating fabric with low infrared emissivity, the fabric comprising a base fabric layer and a surface fabric layer arranged on the base fabric layer, an infrared stealth coating is scraped on the surface fabric layer, characterized in that: An elastic heat-insulating layer is arranged between the base fabric layer and the surface fabric layer, and the elastic heat-insulating layer includes a bottom non-woven fabric layer and a top non-woven fabric layer stacked in sequence, and a first filler layer composed of a plurality of hollow micro-bead particles is evenly sprinkled on the surface of the bottom non-woven fabric layer, and an adhesive layer for fixing the first filler layer and the bottom non-woven fabric is sprayed on the surface of the first filler layer, and a second filler layer composed of a plurality of hollow micro-bead particles is sprinkled on the surface of the adhesive layer, and the top non-woven fabric layer is fixed to the bottom non-woven fabric layer.

2. The infrared stealth coating fabric with low infrared emissivity according to claim 1 is characterized in that: The thickness of the hollow microbead particles between the bottom layer and the top layer of non-woven fabric is 20%-30% of the thickness of the bottom layer or the top layer of non-woven fabric.

3. The infrared stealth coating fabric with low infrared emissivity according to claim 1 is characterized in that: The hollow microsphere particles are hollow glass microspheres with a density of 0.3-0.5 g / cm 3 , particle size is 30~80um.

4. The infrared stealth coating fabric with low infrared emissivity according to claim 1 is characterized in that: The first filler layer and the second filler layer are respectively fixed by winding up and down through the needle-punched fibers of the bottom non-woven fabric and the top non-woven fabric.

5. The infrared stealth coating fabric with low infrared emissivity according to claim 1 is characterized in that: A heat-insulating coating is sprayed on the surface of the top non-woven fabric layer, and the thickness of the heat-insulating coating is 0.1-0.5 mm.

6. The infrared stealth coating fabric with low infrared emissivity according to claim 1 is characterized in that: The thickness of the infrared stealth coating applied on the surface fabric layer is 0.3-0.5 mm.

7. The infrared stealth coating fabric with low infrared emissivity according to claim 6 is characterized in that: A protective layer is sprayed on the surface of the infrared stealth coating.

Images