Light-absorbing and heat-generating composite fabric and preparation method thereof

Abstract

This invention discloses a light-absorbing and heat-generating composite fabric and its preparation method. The light-absorbing and heat-generating composite fabric includes a fabric, a light-absorbing and heat-generating film, and a lining, which are sequentially laminated together. The light-absorbing and heat-generating film includes a matrix and multi-sized powder dispersed within the matrix. The multi-sized powder includes at least a first powder, which is made of a silicon-boron compound, and its particle size distribution ranges from 5 nanometers to 3 micrometers. This invention provides a light-absorbing and heat-generating composite fabric and its preparation method. The composite fabric, made through a multi-level structure and light-absorbing and heat-generating materials, achieves efficient absorption of external light sources and conversion of thermal energy.

Description

Technical Field

[0001] This invention relates to the field of composite fabric technology, specifically to a light-absorbing and heat-generating composite fabric and its preparation method. Background Technology

[0002] With the improvement of living standards, consumers have placed higher demands on the warmth retention of clothing. Currently, commonly used composite thermal fabrics on the market typically consist of an outer fabric, a composite film, and a base fleece. This structure offers some effectiveness in waterproofing, windproofing, and warmth retention, primarily by preventing heat loss. However, these fabrics are still insufficient in terms of heat absorption and storage, making it difficult to meet consumers' needs for warmth retention in extreme environments or during prolonged outdoor activities. In existing technologies, the application of light-absorbing and heat-generating materials mainly focuses on graphene. Traditionally, graphene materials are printed or coated onto thin films, utilizing their unique physical properties to absorb far-infrared light energy and convert it into heat. However, this method has limitations: firstly, graphene's absorption of light is one-sided, primarily absorbing far-infrared light from one direction, which limits its light absorption efficiency and the range of heat conversion; secondly, because graphene is printed or coated onto a thin film, this bonding method is often not ideal in terms of adhesion, easily leading to peeling or performance degradation after prolonged use or repeated washing. Summary of the Invention

[0003] The purpose of this invention is to overcome the above-mentioned defects or problems in the background art and provide a light-absorbing and heat-generating composite fabric and its preparation method. The composite fabric made of multi-level structure and light-absorbing and heat-generating materials can achieve efficient absorption of external light sources and conversion of heat energy.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] The first technical solution relates to a light-absorbing and heat-generating composite fabric, comprising a fabric, a light-absorbing and heat-generating film, and a lining that are sequentially laminated together; the light-absorbing and heat-generating film comprises a matrix and multi-size powder dispersed in the matrix, wherein the multi-size powder comprises at least a first powder, the material of the first powder is a silicon boron compound, and the particle size distribution range of the first powder is 5 nanometers to 3 micrometers.

[0006] The second technical solution is based on the first technical solution, wherein the multi-particle-size powder further includes a second powder, the material of the second powder is at least one of alumina, iron oxide and carbon graphite, and the particle size distribution range of the second powder is 500 nanometers to 800 nanometers.

[0007] The third technical solution is based on the second technical solution, wherein the multi-particle-size powder further includes a third powder, the material of the third powder is a silicate compound, and the particle size distribution range of the third powder is 1 micrometer to 2 micrometers.

[0008] The fourth technical solution is based on the third technical solution, wherein the multi-particle-size powder further includes a fourth powder and a fifth powder. The material of the fourth powder is calcium carbonate, and the particle size distribution range of the third powder is [missing information]. The material of the fifth powder is titanium dioxide, and the particle size distribution range of the fifth powder is 50 nanometers to 80 nanometers.

[0009] The fifth technical solution is based on any one of the first to fourth technical solutions, wherein the matrix is ​​formed by solidification of polyurethane resin containing hydrophilic groups.

[0010] The sixth technical solution is based on the fifth technical solution, wherein the thickness of the light-absorbing heating film is 15 micrometers to 20 micrometers.

[0011] The seventh technical solution is based on the sixth technical solution, wherein the lining is woven from a first fiber, and the first fiber includes a fiber body and the multi-particle-size powder dispersed within the fiber body.

[0012] The eighth technical solution is based on the seventh technical solution, wherein the material of the fiber body is polymerized from PBT and PET.

[0013] The ninth technical solution is based on the eighth technical solution, wherein the material of the fabric is polyester.

[0014] The tenth technical solution is based on any one of the first to ninth technical solutions, wherein the above-mentioned method for preparing a light-absorbing and heat-generating composite fabric includes the following steps: Preparation of the light-absorbing and heat-generating film: Polyurethane resin containing hydrophilic groups, multi-particle-size powder and organic solvent are uniformly mixed and dissolved in a certain proportion to prepare an adhesive with a viscosity in the range of 5000cps to 11000cps, uniformly coated on release paper, and formed a light-absorbing and heat-generating film by a drying process; wherein, the multi-particle-size powder (4) includes at least a first powder, the material of the first powder is a silicon boron compound, and the particle size distribution range of the first powder is 5 nanometers to 3 micrometers; Preparation of the lining: Multi-size powder and PBT polyester chips are combined using a hot-melt process to form a masterbatch. The masterbatch and PET polymer material are fed together into a high-precision spinning machine to form elastic yarn. The elastic yarn is then woven into a greige fabric using a circular knitting machine with high-density needles and automatic tension feeding. The greige fabric undergoes finishing processes such as napping, shearing, and pelletizing to produce a fluffy and soft napped fleece fabric. For the bonding of the composite fabric, environmentally friendly PUR hot melt adhesive is used to bond the light-absorbing and heat-generating film to the fabric in a dotted manner using a hot melt bonding machine. Similarly, the other side of the light-absorbing and heat-generating film is dottedly bonded to the napped fleece fabric to complete the overall bonding of the composite fabric.

[0015] As can be seen from the above description of the present invention, compared with the prior art, the present invention has the following beneficial effects:

[0016] In the first technical solution and related embodiments, the light-absorbing and heat-generating composite fabric achieves efficient full-spectrum light absorption and heat energy conversion by integrating multi-size silicon-boron compounds, while also possessing bidirectional light absorption and heat generation properties, thus improving the overall efficiency of the composite fabric in light energy absorption and utilization. The silicon-boron compound, as the first powder of the core light-absorbing material, possesses full-spectrum absorption characteristics. Its particle size is controlled within a wide range from 5 nanometers to 3 micrometers, covering a particle distribution from nanometer to submicrometer to micrometer scale, effectively covering a wide range of wavelengths from visible light and ultraviolet to infrared, ensuring efficient capture and absorption of light in each wavelength band. Due to the uniform dispersion of multi-size powders within the light-absorbing and heat-generating film, it not only exhibits excellent light absorption and heat generation performance on one side but also displays good light absorption and heat generation effects on both sides.

[0017] In the second technical solution and related embodiments, the second powder is an oxide with light-absorbing capabilities, which further enhances the light absorption and heat conversion capabilities of the light-absorbing and heat-generating composite fabric. With its specific particle size distribution of 500 to 800 nanometers, the second powder not only strengthens the fabric's absorption of visible light energy but also ensures uniform distribution of the powder within the matrix through its excellent dispersibility, thereby improving the overall fabric performance.

[0018] In the third technical solution and related embodiments, a silicate compound is added as a third powder. Specifically, the silicate compound includes aluminum silicate, calcium silicate, and molten lava. Aluminum silicate and calcium silicate, as inorganic insulating materials, enhance the overall thermal insulation effect of the fabric, consolidate its heat insulation performance, and ensure effective heat retention. The molten lava gives the fabric a self-heating characteristic, absorbing moisture generated by the respiration of human skin cells and converting it into heat energy, thereby improving the fabric's comfort and warmth.

[0019] In the fourth technical solution and related embodiments, calcium carbonate, with its nano-sized particles, exhibits excellent dispersibility and stability, which helps to form a uniform dispersion system in the fabric matrix and avoids the agglomeration of powder particles. Titanium dioxide, as the fifth powder, has good dispersing and catalytic capabilities, effectively preventing the agglomeration of other powder particles and maintaining the good dispersion state of the fabric; at the same time, it also has a heat insulation effect, which can further enhance the heat insulation performance of the fabric and reduce heat transfer.

[0020] In the fifth technical solution and related embodiments, the hydrophilic groups can capture and retain dynamic water molecules in the air. By forming stable hydrogen bonds, this not only enhances the fabric's moisture absorption but also makes these water molecules an effective carrier of heat within the fabric. This mechanism not only helps retain heat emitted from the human body and reduces heat loss but also further utilizes the kinetic energy of water molecules in the air to provide additional heat energy to the fabric through a conversion process, thereby improving the fabric's warmth retention performance.

[0021] In the sixth technical solution and related embodiments, the uniform mixing of the polyurethane membrane and the multi-particle-size powder dispersion, through intermolecular bridging reactions during the drying process, forms a non-porous, waterproof, and breathable membrane. This membrane effectively resists the penetration of external moisture, protecting the wearer from rain or moisture and keeping them dry and comfortable. Simultaneously, despite its non-porous structure, the molecular arrangement and processing give the membrane excellent moisture permeability, allowing moisture and water vapor generated inside the fabric to escape smoothly, preventing moisture accumulation.

[0022] In the seventh technical solution and related embodiments, multi-size powder is dispersed inside the first fiber. The lining not only enhances the absorption capacity of external light and heat conducted from the light-absorbing heating film, but also improves the capture efficiency of heat emitted from the human body and far-infrared energy, so that a heat exchange system is formed between the lining and the human body. By absorbing and converting this heat, the warmth retention performance of the fabric is further improved.

[0023] In the eighth technical solution and related embodiments, the fiber body is made of PBT and PET polymerized together. Through a fleece-pulling process, the lining forms a multi-fiber, fluffy, and heat-retaining fabric structure. This structure increases the fluffiness and softness of the lining, making it more skin-friendly and providing better warmth retention. At the same time, the multi-fiber structure also helps enhance the breathability and sweat-wicking properties of the lining, preventing sweat from accumulating on the skin surface and causing discomfort.

[0024] In the ninth technical solution and related embodiments, the material of the fabric is polyester, which has good elasticity and abrasion resistance, and can adapt to various human movements without being easily damaged.

[0025] In the tenth technical solution and related embodiments, the light-absorbing and heat-generating composite fabric prepared by this method has excellent light-absorbing and heat-generating performance, is waterproof and hydrophilic, has a soft feel, and is comfortable to wear. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the light-absorbing and heat-generating composite fabric structure as an example.

[0028] Figure 2 This is a schematic diagram illustrating the principle of a light-absorbing and heat-generating composite fabric as an example.

[0029] Explanation of key figure labels:

[0030] 1. Outer fabric; 2. Light-absorbing and heat-generating film; 3. Lining; 4. Multi-particle-size powder. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are preferred embodiments of the present invention and should not be considered as excluding other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0032] Unless otherwise expressly defined, the use of terms such as "first," "second," or "third" in the claims, description, and accompanying drawings of this invention is for distinguishing different objects and not for describing a specific order.

[0033] Unless otherwise expressly defined, in the claims, description, and accompanying drawings of this invention, the use of directional terms such as "center," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "inner," "outer," "upper," "lower," "front," "rear," "left," "right," "clockwise," and "counterclockwise" to indicate orientation or positional relationships is based on the orientation and positional relationships shown in the accompanying drawings and is only for the convenience of describing the invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the specific scope of protection of this invention.

[0034] Unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" used in the claims, description and drawings of this invention should be interpreted broadly to refer to any connection in which there is no displacement or relative rotation relationship between the two parties, including non-removable fixed connection, detachable fixed connection, integral connection and fixed connection by other means or components.

[0035] In the claims, description and accompanying drawings of this invention, the terms "comprising," "having," and variations thereof are used to mean "including but not limited to."

[0036] See Figure 1 and Figure 2 ,like Figure 1 and Figure 2 As shown, it includes fabric 1, light-absorbing and heat-generating film 2, and lining 3, which are bonded together in sequence.

[0037] Fabric 1, located on the side of the composite fabric away from the human body, primarily serves to protect the internal light-absorbing and heat-generating film 2 and lining 3, while also resisting external environmental factors such as wind and rain. Specifically, fabric 1 is made of polyester. In this embodiment, fabric 1 is made of polyester four-way stretch fabric 1, which has good elasticity and abrasion resistance, adapting to various human movements without easily breaking. Polyester four-way stretch fabric 1 also has good waterproof performance, effectively preventing rainwater and other liquids from penetrating into the interior of the composite fabric, protecting the internal light-absorbing and heat-generating film 2 and lining 3 from damage.

[0038] The light-absorbing and heat-generating film 2, located between the fabric 1 and the lining 3, is the core component of the composite fabric. The film 2 comprises a matrix and multi-sized powder 4 dispersed within the matrix. The matrix is ​​formed by solidifying polyurethane resin containing hydrophilic groups. These hydrophilic groups are high-molecular-weight hydrophilic groups, including at least one hydroxyl, carboxyl, ester, or aldehyde group. These hydrophilic groups can capture and retain dynamic water molecules in the air, forming stable hydrogen bonds. This not only enhances the hygroscopicity of the fabric 1 but also makes these water molecules effective carriers of heat within the fabric 1. This mechanism not only helps retain heat emitted from the human body and reduces heat loss but also further utilizes the kinetic energy of water molecules in the air, providing additional heat energy to the fabric 1 through a conversion process, thus improving the fabric 1's thermal insulation performance.

[0039] The multi-particle-size powder 4 includes a first powder, a second powder, a third powder, a fourth powder, and a fifth powder.

[0040] The first powder is made of a silicon-boron compound, with a particle size distribution ranging from 5 nanometers to 3 micrometers. As the core light-absorbing material, the silicon-boron compound possesses full-spectrum absorption characteristics. Its particle size is controlled within a wide range of 5 nanometers to 3 micrometers, encompassing nanoscale, submicron-scale, and even micrometer-scale particle distributions, effectively covering a broad spectrum from visible light and ultraviolet light to infrared light, ensuring efficient capture and absorption of light across all wavelengths.

[0041] The second powder is made of at least one of alumina, iron oxide, and carbon black, and its particle size distribution ranges from 500 nanometers to 800 nanometers. In this embodiment, the second powder is made of alumina, iron oxide, and carbon black. The second powder is an oxide with light-absorbing capabilities, which further enhances the light absorption and heat conversion capabilities of the light-absorbing and heat-generating composite fabric. With its specific particle size distribution of 500 to 800 nanometers, the second powder not only strengthens the absorption of visible light energy by the composite fabric but also ensures uniform distribution of the powder in the matrix through its good dispersibility, thereby improving the overall performance of the fabric 1.

[0042] The third powder is a silicate compound with a particle size distribution ranging from 1 micrometer to 2 micrometers. In this embodiment, the silicate compound includes aluminum silicate, calcium silicate, and lava. Aluminum silicate and calcium silicate, as inorganic insulating materials, enhance the overall insulation effect of fabric 1, strengthen its thermal insulation performance, and ensure effective heat retention. Lava gives fabric 1 a self-heating characteristic, absorbing moisture generated by human skin cell respiration and converting it into heat energy, thus improving the comfort and warmth of fabric 1.

[0043] The fourth powder is made of calcium carbonate, while the third powder has a particle size distribution ranging from 500 nanometers to 1 micrometer. Calcium carbonate, with its nano-sized particles, exhibits good dispersibility and stability, which helps to form a uniform dispersion system in the matrix and avoids the agglomeration of powder particles.

[0044] The fifth powder is made of titanium dioxide, and its particle size distribution ranges from 50 nanometers to 80 nanometers. Titanium dioxide has good dispersing and catalytic ability, which can effectively prevent the agglomeration of other powder particles and maintain the good dispersion state of fabric 1; at the same time, it also has a heat insulation effect, which can further enhance the heat insulation performance of fabric 1 and reduce heat transfer.

[0045] The thickness of the light-absorbing and heat-generating film 2 is 15 to 20 micrometers. The polyurethane film is uniformly mixed with the dispersion of multi-particle-size powder 4, and during the drying process, a non-porous, waterproof, and breathable membrane is formed through intermolecular bridging reactions. This membrane effectively resists the penetration of external moisture, protecting the wearer from rain or moisture and keeping them dry and comfortable. Simultaneously, despite its non-porous structure, its molecular arrangement and processing give the membrane good moisture permeability, allowing moisture and water vapor generated inside the fabric 1 to escape smoothly, preventing moisture accumulation. In this embodiment, the light-absorbing and heat-generating film 2 can withstand water pressure exceeding 6000 mmH2O.

[0046] The lining 3 is woven from a first fiber, which includes a fiber body and multi-sized powder 4 dispersed within the fiber body. The fiber body is made of PBT (polybutylene terephthalate) and PET (polyethylene terephthalate). In this embodiment, the lining 3 is a microfiber fleece, and the second powder in the multi-sized powder 4 is alumina. The prepared lining 3 is a fluffy, soft, and heat-retaining fleece fabric.

[0047] In this embodiment, multi-particle-size powder 4 is dispersed inside the first fiber. The lining 3 not only enhances the absorption capacity of external light and heat conducted from the light-absorbing heating film 2, but also improves the capture efficiency of heat emitted from the human body and far-infrared energy, so that a heat exchange system is formed between the lining 3 and the human body. By absorbing and converting this heat, the warmth retention performance of the fabric 1 is further improved.

[0048] In this embodiment, the fiber body is made of PBT and PET polymerized together. Through a fleece-pulling process, the lining 3 forms a multi-fiber, fluffy, and heat-retaining fabric structure. This structure increases the fluffiness and softness of the lining 3, making it more skin-friendly and providing better warmth retention. At the same time, the multi-fiber structure also helps to enhance the breathability and sweat-wicking properties of the lining 3, preventing sweat from accumulating on the skin surface and causing discomfort.

[0049] The light-absorbing and heat-generating composite fabric is formed by bonding the light-absorbing and heat-generating film 2 to the fabric 1 and the lining 3 at multiple points. The fabric 1, the light-absorbing and heat-generating film 2, and the lining 3 are combined together through a multi-layer composite technology to form a composite fabric structure. Specifically, the light-absorbing and heat-generating film 2 is bonded to the fabric 1 and the lining 3 at points using PUR hot melt adhesive to form a multi-layer structure.

[0050] In this embodiment, the light-absorbing and heat-generating composite fabric achieves efficient full-spectrum light absorption and heat energy conversion by integrating multi-size silicon-boron compounds, while also possessing bidirectional light-absorbing and heat-generating properties, thus improving the overall efficiency of the composite fabric in light energy absorption and utilization. Due to the uniform dispersion of the multi-size powder 4 within the light-absorbing and heat-generating film 2, it not only exhibits excellent light-absorbing and heat-generating performance on one side but also demonstrates good light absorption and heat generation effects on both sides.

[0051] A method for preparing a light-absorbing and heat-generating composite fabric includes the following steps:

[0052] Fabrication of the light-absorbing and heat-generating film 2: Polyurethane resin containing hydrophilic groups, multi-particle-size powder 4 and organic solvent are uniformly mixed and dissolved in a certain proportion to prepare an adhesive with a viscosity in the range of 5000cps to 11000cps, which is uniformly coated on release paper and formed into the light-absorbing and heat-generating film 2 by a drying process; wherein, the multi-particle-size powder 4 includes at least a first powder, the material of the first powder is a silicon boron compound, and the particle size distribution range of the first powder is 5 nanometers to 3 micrometers.

[0053] Production of lining 3: Multi-particle size powder 4 and PBT polyester chips are made into masterbatch through hot melt process; the masterbatch and PET polymer material are fed into a high-precision spinning machine and drawn into elastic yarn; the above elastic yarn is woven into greige fabric using a circular knitting machine with high-density needle automatic tension yarn feeding; the greige fabric is then processed by napping, shearing, and tumbling to produce fluffy and soft napped lining 3.

[0054] Composite fabric bonding: Using environmentally friendly PUR hot melt adhesive, the light-absorbing and heat-generating film 2 is bonded to the fabric 1 in a dotted manner using a hot melt bonding machine; similarly, the other side of the light-absorbing and heat-generating film 2 is bonded to the above-prepared fleece fabric 3 in a dotted manner to complete the overall bonding of the composite fabric.

[0055] In the fabrication of the light-absorbing and heat-generating film 2 in this embodiment, the organic solvents used are ethyl acetate and DMF. The specific contents are as follows: based on 100% polyurethane resin, 10-20% of the multi-particle-size powder 4 dispersion, 25-30% of ethyl acetate, and 5-10% of DMF. The final light-absorbing and heat-generating film 2 is a non-porous, waterproof, and breathable film.

[0056] In this embodiment, the specific process for bonding the composite fabric is as follows: First, environmentally friendly PUR hot melt adhesive is used to spot-bond the light-absorbing and heat-generating film 2 to the fabric 1. During the spot bonding process of the fabric 1, a hot melt laminating machine is used, employing moisture-reactive hot melt technology. By precisely controlling the temperature and humidity, a chemical reaction occurs between the PUR hot melt adhesive and the light-absorbing and heat-generating film 2 and the fabric 1, forming a strong bond. Simultaneously, an automatic tension control system ensures that the fabric 1 and the light-absorbing and heat-generating film 2 maintain constant tension during transport, thereby ensuring the uniformity and quality of the lamination. Second, the light-absorbing and heat-generating film 2 is bonded to the lining 3 in the same way. A multi-layer lamination technology is used to bond the polyurethane film to the fabric 1 and the lining 3 using environmentally friendly PUR hot melt adhesive spot bonding. This technology utilizes an environmentally friendly moisture-reactive hot melt laminating machine, ensuring that each layer of material maintains a stable shape during the lamination process under automatic tension control. By controlling the temperature and humidity, the curing process of the composite fabric is completed. Multi-layer composite technology not only ensures a strong bond between layers, but also fully leverages the advantages of each layer's materials through rational interlayer design, thus optimizing the overall performance of fabric 1. Furthermore, the use of environmentally friendly materials (such as PUR hot melt adhesive) for interlayer bonding ensures the environmental friendliness and safety of the composite fabric for human health.

[0057] In this embodiment, the light-absorbing and heat-generating composite fabric prepared by this method has excellent light-absorbing and heat-generating performance, is waterproof and hydrophilic, and the fabric is soft to the touch and comfortable to wear.

[0058] The foregoing description of the specifications and embodiments is intended to explain the scope of protection of this invention, but does not constitute a limitation on the scope of protection of this invention. Modifications, equivalent substitutions, or other improvements to the embodiments of this invention or a portion thereof that can be obtained by those skilled in the art through logical analysis, reasoning, or limited experimentation, based on the teachings of this invention or the foregoing embodiments, in conjunction with common knowledge, general technical knowledge, and / or existing technology, should all be included within the scope of protection of this invention.

Claims

1. A light-absorbing and heat-generating composite fabric, characterized in that, The light-absorbing and heating film (2) and the lining (3) are sequentially bonded together. The light-absorbing and heating film (2) includes a matrix and multi-particle-size powder (4) dispersed in the matrix. The multi-particle-size powder (4) includes at least a first powder and a second powder. The material of the first powder is a silicon boron compound, and the particle size distribution range of the first powder is 5 nanometers to 3 micrometers. The material of the second powder is at least one of aluminum oxide and iron oxide, and the particle size distribution range of the second powder is 500 nanometers to 800 nanometers. The matrix is ​​formed by solidifying polyurethane resin containing hydrophilic groups. The light-absorbing and heating film (2) is made by uniformly mixing and dissolving polyurethane resin containing hydrophilic groups, multi-particle-size powder (4) and organic solvent in a certain proportion, preparing an adhesive with a viscosity in the range of 5000 cps to 11000 cps, uniformly coating it on release paper, and forming the light-absorbing and heating film (2) by drying process.

2. The light-absorbing and heat-generating composite fabric as described in claim 1, characterized in that, The multi-particle-size powder (4) also includes a third powder, the material of which is a silicate compound, and the particle size distribution range of which is 1 micrometer to 2 micrometers.

3. The light-absorbing and heat-generating composite fabric as described in claim 2, characterized in that, The multi-particle-size powder (4) also includes a fourth powder and a fifth powder. The fourth powder is made of calcium carbonate, and the particle size distribution range of the third powder is 500 nanometers to 1 micrometer. The fifth powder is made of titanium dioxide, and the particle size distribution range of the fifth powder is 50 nanometers to 80 nanometers.

4. The light-absorbing and heat-generating composite fabric as described in claim 3, characterized in that, The thickness of the light-absorbing heating film (2) is 15 micrometers to 20 micrometers.

5. The light-absorbing and heat-generating composite fabric as described in claim 4, characterized in that, The lining (3) is woven from a first fiber, which includes a fiber body and the multi-particle-size powder (4) dispersed within the fiber body.

6. The light-absorbing and heat-generating composite fabric as described in claim 5, characterized in that, The fiber body is made of PBT and PET polymerized together.

7. The light-absorbing and heat-generating composite fabric as described in claim 6, characterized in that, The material of the fabric (1) is polyester.

8. A method for preparing a light-absorbing and heat-generating composite fabric as described in any one of claims 1 to 7, characterized in that, Includes the following steps: Preparation of light-absorbing and heat-generating film (2): Polyurethane resin containing hydrophilic groups, multi-particle-size powder (4) and organic solvent are mixed and dissolved in a certain proportion to prepare adhesive with a viscosity in the range of 5000cps to 11000cps, which is then uniformly coated on release paper and formed into light-absorbing and heat-generating film (2) through drying process. Lining (3) production: Multi-size powder (4) and PBT polyester chips are made into masterbatch through hot melt process; the masterbatch and PET polymer material are fed into a high-precision spinning machine and drawn into elastic yarn; the elastic yarn is woven into greige fabric using a circular knitting machine with high-density needle automatic tension yarn feeding; the greige fabric is then processed by napping, shearing, and tumbling to produce fluffy and soft napped lining (3). Composite fabric bonding: Using environmentally friendly PUR hot melt adhesive, the light-absorbing and heat-generating film (2) and the fabric (1) are bonded in a dotted manner through a hot melt bonding machine; the other side of the light-absorbing and heat-generating film (2) is bonded in a dotted manner to the prepared lining (3) to complete the overall bonding of the composite fabric.

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