A three-dimensional heat-reflective insulating material and its preparation method

Abstract

This invention provides a three-dimensional heat-reflective thermal insulation material and its preparation method, belonging to the field of functional textile technology. The preparation method includes the following steps: bonding a heat-reflective metal foil layer to one surface of a flexible textile substrate, the heat-reflective metal foil layer comprising a heat-reflective functional layer of metal and / or metal oxide; then embossing the heat-reflective metal foil layer with a three-dimensional embossing roller to obtain the three-dimensional heat-reflective thermal insulation material; the surface of the three-dimensional heat-reflective thermal insulation material has a three-dimensional pattern with a uniform closed pattern array. The heat-reflective metal foil layer on the surface of the flexible textile substrate of this invention can effectively reflect its own infrared radiation, ensuring a smaller thickness while improving the thermal insulation effect; moreover, its specific three-dimensional pattern structure further improves the thermal insulation performance. The thermal insulation material of this invention can be very thin, thus maintaining the comfort of clothing and other application products.

Description

Technical Field

[0001] This invention belongs to the field of functional textile technology and relates to a three-dimensional heat-reflective thermal insulation material and its preparation method. Background Technology

[0002] Thermal insulation materials are widely used in clothing, footwear, and gloves. Generally, the design of thermal insulation materials often incorporates more air to reduce heat loss. For example, Chinese patent document CN 204080289U discloses a breathable thermal insulation fabric and a breathable thermal insulation woven fabric. This breathable thermal insulation fabric is composed of perpendicularly intersecting warp and weft yarns, wherein the warp yarns are profiled fibers and the weft yarns are a blend of wool and rabbit hair. The profiled fibers are composed of bundles of several monofilaments, each monofilament having at least one hollow structure in its cross-section. The advantage is that the profiled fibers and the hollow structure within the monofilament contain a large amount of still air, resulting in a comfortable and warm fabric that is lighter and warmer than typical heavy thermal fabrics, and more breathable and drier.

[0003] The aforementioned insulation methods require fabrics with a large number of hollow structures, which necessitates a significant fabric thickness; otherwise, their insulation effect will be greatly reduced. If such insulation fabrics are applied to footwear, the compressed space will severely compromise their insulation performance. With the continuous development of economic life and technological advancements, people increasingly aspire to a fashionable and comfortable lifestyle, thus promoting the research and development and production of high-performance insulation materials. Therefore, developing an insulation material with excellent warmth and comfort is essential. Summary of the Invention

[0004] In view of this, the present invention provides a three-dimensional heat-reflective thermal insulation material and its preparation method. The thermal insulation material prepared by the present invention does not require a large thickness, has excellent thermal insulation performance, and is suitable for application in clothing, footwear and other products.

[0005] This invention provides a method for preparing a three-dimensional heat-reflective thermal insulation material, comprising the following steps:

[0006] A heat-reflective metal foil layer is bonded to one surface of a flexible textile substrate. The heat-reflective metal foil layer contains a heat-reflective functional layer of metal and / or metal oxide. Then, the heat-reflective metal foil layer is embossed with a three-dimensional embossing roller to obtain a three-dimensional heat-reflective thermal insulation material.

[0007] The surface of the three-dimensional heat-reflective insulation material has a three-dimensional pattern with a uniform closed pattern array.

[0008] In some embodiments of the present invention, the heat-reflective metal foil layer is bonded to one surface of the flexible textile substrate by means of: applying an adhesive to one surface of the flexible textile substrate using screen printing, and then bonding the heat-reflective metal foil layer to the surface of the flexible textile substrate by heat pressing.

[0009] In some embodiments of the present invention, the heat-reflective metal foil layer is bonded to one surface of the flexible textile substrate by means of: bonding the heat-reflective metal foil layer to one surface of the flexible textile substrate by means of adhesive transfer printing.

[0010] In some embodiments of the present invention, a transparent resin optical interference layer is further laminated on the surface of the heat-reflective functional layer of the heat-reflective metal foil layer; the transparent resin optical interference layer is embossed using a three-dimensional embossing roller to obtain a three-dimensional heat-reflective heat-insulating material with dazzling interference colors.

[0011] In some embodiments of the present invention, the metal in the heat-reflective metal foil layer is selected from one or more of gold, silver, copper, aluminum, platinum and rhodium, and the metal oxide is selected from one or more of aluminum oxide, magnesium oxide, titanium oxide, zinc oxide and zirconium oxide.

[0012] In some embodiments of the present invention, the textile flexible substrate is selected from one or more of woven fabrics, knitted fabrics, and nonwoven fabrics.

[0013] In some embodiments of the present invention, the flexible textile substrate is further filled with a down-modified material, which is obtained by treating down with a heat-reflective modifier.

[0014] In some embodiments of the present invention, the individual three-dimensional floral pattern on the surface of the three-dimensional heat-reflective insulation material is a circle, an ellipse, or a regular hexagon.

[0015] The present invention provides a three-dimensional heat-reflective thermal insulation material obtained by the preparation method described above, wherein the thickness of the three-dimensional heat-reflective thermal insulation material is 3-10 mm.

[0016] In some embodiments of the present invention, the three-dimensional heat-reflective insulating material is applied to clothing, shoe uppers, gloves, or textile decorative products.

[0017] Compared with existing technologies, the method of this invention involves bonding a heat-reflective metal foil layer to the surface of a flexible textile substrate, and then forming a specific three-dimensional surface structure through three-dimensional embossing, thereby obtaining a three-dimensional heat-reflective thermal insulation material. The heat-reflective metal foil layer comprises a heat-reflective functional layer of metal and / or metal oxide. The heat-reflective metal foil layer on the surface of the flexible textile substrate of this invention can effectively reflect its own infrared radiation, ensuring a smaller thickness while improving the thermal insulation effect; moreover, its specific three-dimensional pattern structure further improves the thermal insulation performance. The thermal insulation material of this invention can be very thin, thus maintaining the comfort of clothing and other application products. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the hot stamping foil structure used in Embodiment 1 of the present invention;

[0019] Figure 2 A photograph of the three-dimensional heat-reflective insulation material of Embodiment 1 of the present invention;

[0020] Figure 3 This is a photograph of the three-dimensional heat-reflective insulation material of Embodiment 2 of the present invention;

[0021] Figure 4 This is a diagram of the testing apparatus in an embodiment of the present invention. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be described in detail below with reference to specific embodiments. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of the present invention in any way.

[0023] This invention provides a method for preparing a three-dimensional heat-reflective insulating material, comprising the following steps:

[0024] A heat-reflective metal foil layer is bonded to one surface of a flexible textile substrate. The heat-reflective metal foil layer contains a heat-reflective functional layer of metal and / or metal oxide. Then, the heat-reflective metal foil layer is embossed with a three-dimensional embossing roller to obtain a three-dimensional heat-reflective thermal insulation material.

[0025] The surface of the three-dimensional heat-reflective insulation material has a three-dimensional pattern with a uniform closed pattern array.

[0026] The thermal insulation material prepared by this invention does not require a large thickness, has excellent thermal insulation performance, and is suitable for application in clothing, footwear and other products.

[0027] In some embodiments of the present invention, an adhesive is applied to a flexible textile substrate using screen printing, and a heat-reflective metal foil is pressed onto the substrate using a flatbed press to obtain continuous or discontinuous patterns, and may also have iridescent colors with a rainbow effect.

[0028] In some embodiments of the present invention, the heat-reflective metal hot stamping foil layer is transferred and bonded to a surface of a flexible textile substrate by means of a rotary roller transfer hot stamping device.

[0029] Transfer printing refers to the hot stamping process using flat and round rollers as described above.

[0030] In the heat-reflective metal foil layer, the metal is selected from one or more of gold, silver, copper, aluminum, platinum, and rhodium, and the metal oxide is selected from one or more of aluminum oxide, magnesium oxide, titanium oxide, zinc oxide, and zirconium oxide. In some embodiments of the present invention, the heat-reflective metal hot stamping foil includes a polyester film substrate, a release layer, a protective layer, a functional layer, and an adhesive layer. The adhesive forms the adhesive layer, and the adhesive is one of acrylic resin, polyurethane resin, or polyurethane hot melt adhesive.

[0031] The aforementioned transfer printing specifically refers to a heat pressing process; specifically, the screen printing process involves applying the adhesive to the fabric using a screen printing method. The temperature can be 100-120℃, and the time is 1 minute. The adhesive is one of acrylic resin dispersant, polyurethane resin dispersant, or polyurethane hot melt adhesive. The heat pressing temperature can be 150-190℃, the pressure 0.5-2 MPa, and the time 60-90 seconds.

[0032] The surface of the heat-reflective functional layer of the heat-reflective metal foil layer is also coated with a transparent resin optical interference layer; the transparent resin optical interference layer is embossed with a three-dimensional embossing roller to obtain a three-dimensional heat-reflective insulation material with dazzling interference colors; the transparent resin optical interference layer is located on the functional layer.

[0033] Hot stamping foil can be made of solid colors such as gold and silver, or materials with multi-layer interference rainbow film. Multi-layer interference rainbow film is a thin film with a rainbow effect, made by multi-layer composite co-extrusion of thermoplastic transparent resins with different refractive indices based on the principle of light interference of multi-layer films. It shows a dazzling effect depending on the viewing angle.

[0034] In this embodiment of the invention, a three-dimensional embossing roller is used to emboss the material, creating a three-dimensional shape. The individual three-dimensional patterns on the surface of the three-dimensional heat-reflective insulation material are circular, elliptical, or regular hexagonal.

[0035] The flexible textile substrate is selected from one or more of woven fabrics, knitted fabrics and nonwoven fabrics; fabrics with stiffness of less than 4cm are preferred as the substrate.

[0036] The flexible textile substrate is also filled with down-modified material (also known as modified down), which is obtained by treating down with a heat-reflective modifier.

[0037] Specifically, the preparation method of the down-modified material is as follows:

[0038] (1) Preparation of modified down finishing solution: Add dispersant to 10-20 parts of water and disperse evenly. Add 5-10 parts of one or more of metal / metal oxides, infrared reflective pigments, and heat insulation materials and disperse evenly. Add 20-30 parts of binder and continue dispersing. The heat insulation material is one or more of polyimide powder, hollow glass microspheres, hollow ceramic microspheres, and expanded microspheres. The dispersant includes one or more of nonionic surfactants such as isomeric alcohol polyoxyethylene ether and fatty alcohol polyoxyethylene ether.

[0039] (2) Obtaining modified down: The down is dehydrated and immersed in a finishing solution, rinsed with clean water, dehydrated and dried to obtain the desired white duck down. The raw material down is one or more of white duck down, white goose down, grey goose down, grey duck down, cashmere, rabbit down, etc., all of which are down materials well known to those skilled in the art.

[0040] Accordingly, embodiments of the present invention provide a three-dimensional heat-reflective insulating material obtained by the preparation method described above.

[0041] Preferably, the thickness of the three-dimensional heat-reflective insulation material is in the range of 3-10mm; it can be applied to clothing, shoe uppers, gloves or textile decorative products.

[0042] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The embodiments described herein are only for the purpose of understanding the present invention, and the implementation of the present invention is not limited thereto. The raw materials used in the embodiments of the present invention are commercially available.

[0043] Example 1

[0044] Adhesive is applied to woven fabric (fabric with a stiffness of less than 4cm) using screen printing at 110℃ for 1 minute. A silver hot stamping foil is then pressed onto the fabric using a flatbed press to create a continuous pattern and iridescent colors with a rainbow effect. The hot stamping foil used is Kurz's Light Line Laser, a multi-layer interference rainbow film with a structure as shown... Figure 1 As shown, this multilayer interference rainbow film consists of a polyester film (PET substrate), a release layer, a top layer, functional layers, and an adhesive layer. Based on the principle of optical interference in multilayer films, it is a film with a rainbow effect, made by co-extruding multiple layers of thermoplastic transparent resins with different refractive indices, exhibiting a dazzling effect depending on the viewing angle. The adhesive is acrylic resin; the pressing temperature is 190℃, the pressure is 1 MPa, and the time is 90 seconds.

[0045] Finally, an embossing roller is used to emboss the material, creating a three-dimensional shape. The individual three-dimensional patterns on the surface of the heat-reflective insulation material are elliptical, such as... Figure 2 As shown, Figure 2 This is a photograph of the three-dimensional heat-reflective insulation material of Embodiment 1 of the present invention.

[0046] Example 2

[0047] The adhesive was applied to the nonwoven fabric (fabric with a stiffness of less than 4 cm) using screen printing at a temperature of 110°C for 1 minute. A silver hot stamping foil was then pressed onto the fabric using a flatbed press to obtain a discontinuous pattern. The hot stamping film was Kurz 18614, with the same longitudinal structure as in Example 1, but a different surface layer. The adhesive was a polyurethane hot melt adhesive, Covestro Impraperm DL 5249; the pressing temperature was 150°C, the pressure was 2 MPa, and the time was 60 seconds.

[0048] Finally, an embossing roller is used to emboss the material, creating a three-dimensional shape. The individual three-dimensional patterns on the surface of the heat-reflective insulation material are regular hexagons, such as... Figure 3 As shown, Figure 3 This is a photograph of the three-dimensional heat-reflective insulation material of Embodiment 2 of the present invention.

[0049] The performance of the thermal insulation materials described in the above embodiments was tested using the following methods:

[0050] (1) Irradiation temperature difference: In a standard environment, the average surface temperature of the unirradiated sample was recorded using a non-contact infrared thermometer. Then, a fabric of a certain specification was irradiated at a certain distance (20cm) using a standard multi-source multi-color lamp with light source A. After 10 minutes, the average temperature of the irradiated area of ​​the fabric surface was measured using a non-contact infrared thermometer, and the temperature difference before and after irradiation was calculated. (See the test setup for details.) Figure 4 .

[0051] (2) Clo value: Tested according to GB / T 35762-2017 Test method for heat transfer properties of textiles, plate method.

[0052] (3) Thermal insulation rate: Tested according to GB / T 35762-2017 Test method for heat transfer properties of textiles, plate method.

[0053] (4) Height of the solid structure: Measured with a ruler.

[0054] (5) Thermal conductivity: Tested according to GB / T 11048-2008 (Type A instrument).

[0055] The test results are shown in Table 1. Among them, Comparative Sample 1 is a heat-reflective ordinary woven fabric, which is a 50D all-polyester spring spun fabric, a single-layer fabric, with the heat-reflective layer formed in the same way as in Example 1, but without embossing; Comparative Sample 2 is an ordinary woven fabric.

[0056] Table 1. Test results of thermal insulation performance, etc., of Examples 1-2 of the present invention.

[0057]

[0058] Note: All fabrics are white.

[0059] As can be seen from the table, three-dimensional embossing only requires a single layer, saving on process and raw materials, and its heat retention is comparable to or higher than that of two layers; the embossing height in the example is the three-dimensional height, and the higher the height, the better the heat retention.

[0060] Example 3

[0061] Some embodiments of the fabric are first embossed and then filled with modified down, resulting in better warmth retention.

[0062] The modified down in this embodiment of the invention can also achieve heat reflectivity. The modified down is prepared as follows:

[0063] (1) Preparation of modified down finishing solution: Add dispersant to 20 parts of water and disperse evenly. Add 5 parts of metal oxide alumina and 5 parts of heat insulation material and disperse evenly. Add 20-30 parts of binder and continue dispersing. The heat insulation material is polyimide powder and hollow glass microspheres in a ratio of 9:1. The average particle size of the polyimide powder is 1 μm and the average particle size of the hollow glass microspheres is 3 μm. The dispersant is nonionic surfactant isomeric alcohol polyoxyethylene ether 1309.

[0064] (2) Obtaining modified down: Dehydrate the white duck down and soak it in the above finishing solution, rinse with clean water, dehydrate and dry to obtain the desired white duck down.

[0065] As can be seen from the above embodiments, the method of the present invention involves bonding a heat-reflective metal foil layer to the surface of a flexible textile substrate, and then forming a certain three-dimensional surface structure through three-dimensional embossing, thereby obtaining a three-dimensional heat-reflective thermal insulation material; the heat-reflective metal foil layer includes a heat-reflective functional layer of metal and / or metal oxide. The heat-reflective metal foil layer on the surface of the flexible textile substrate of the present invention can effectively reflect its own infrared radiation, ensuring a smaller thickness while improving the thermal insulation effect; moreover, its specific three-dimensional pattern structure further improves the thermal insulation performance, which is beneficial to the warmth and comfort of clothing and other application products.

[0066] Finally, it should be noted that the specific embodiments described herein are merely illustrative of the spirit of the invention and are not intended to limit the implementation of the invention. Those skilled in the art can make other modifications or additions to the described embodiments and use similar methods to substitute them; it is neither necessary nor possible to exemplify all embodiments here. However, these obvious variations or modifications derived from the essential spirit of the invention still fall within the scope of protection of the invention, and interpreting them as any additional limitation would contradict the spirit of the invention.

Claims

1. A method for preparing a three-dimensional heat-reflective thermal insulation material, characterized in that, Includes the following steps: A heat-reflective metal foil layer is bonded to one surface of a flexible textile substrate. The heat-reflective metal foil layer contains a heat-reflective functional layer of metal and / or metal oxide. Then, the heat-reflective metal foil layer is embossed with a three-dimensional embossing roller to obtain a three-dimensional heat-reflective thermal insulation material. The surface of the three-dimensional heat-reflective insulation material has a three-dimensional pattern with a uniform closed pattern array, and each three-dimensional pattern is a circle, an ellipse or a regular hexagon. The specific method for bonding a heat-reflective metal foil layer to one surface of the flexible textile substrate is as follows: an adhesive is applied to one surface of the flexible textile substrate using screen printing, and then the heat-reflective metal foil layer is bonded to this surface of the flexible textile substrate by heat pressing. Alternatively, the heat-reflective metal foil layer can be transferred and bonded to a surface of a flexible textile substrate using an adhesive layer.

2. The preparation method according to claim 1, characterized in that, The surface of the heat-reflective functional layer of the heat-reflective metal foil layer is also coated with a transparent resin optical interference layer; the transparent resin optical interference layer is embossed with a three-dimensional embossing roller to obtain a three-dimensional heat-reflective insulation material with dazzling interference colors.

3. The preparation method according to any one of claims 1-2, characterized in that, In the heat-reflective metal foil layer, the metal is selected from one or more of gold, silver, copper, aluminum, platinum and rhodium, and the metal oxide is selected from one or more of aluminum oxide, magnesium oxide, titanium oxide, zinc oxide and zirconium oxide.

4. The preparation method according to any one of claims 1-2, characterized in that, The flexible textile substrate is selected from one or more of woven fabrics, knitted fabrics, and nonwoven fabrics.

5. The preparation method according to claim 4, characterized in that, The flexible textile substrate is also filled with down-modified material, which is obtained by treating down with a heat-reflective modifier.

6. The three-dimensional heat-reflective insulating material obtained by the preparation method according to any one of claims 1-5, characterized in that, The thickness of the three-dimensional heat-reflective insulation material is 3-10mm.

7. The three-dimensional heat-reflective insulation material according to claim 6, characterized in that, The three-dimensional heat-reflective insulating material is used in clothing, shoe uppers, gloves, or textile decorative products.

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