A method for manufacturing a novel convection heat dissipation radiation refrigeration graphene fabric

Abstract

The application discloses a novel convection heat dissipation radiation refrigeration fabric, and realizes efficient radiation refrigeration from inside to outside through integration of a unique fabric structure design, various heat dissipation principles and a targeted manufacturing process, and air convection heat dissipation is generated by virtue of the concave-convex shape of the fabric, the human body heat dissipation efficiency of the fabric is effectively improved, and then the comfort of wearing or using is improved.

Description

Technical Field

[0001] This invention relates to the field of textile fabric technology, and in particular to a method for manufacturing a novel convection heat dissipation and radiation cooling graphene fabric. Background Technology

[0002] Currently available radiative cooling fabrics have certain limitations in terms of heat dissipation mechanisms and fabric structure. Most focus on achieving cooling by reflecting external heat sources such as solar heat through the outer radiative cooling material and increasing the emissivity of the outer layer. They do not adequately consider the dissipation of heat generated by the human body itself or the use of fabric structural characteristics to improve heat dissipation efficiency. There is a lack of products that integrate multiple efficient heat dissipation principles and unique structural designs.

[0003] Existing fabrics cannot fully meet people's needs for rapid and efficient heat dissipation in actual wearing or usage scenarios, and the synergy between the inherent properties of graphene fabrics and their heat dissipation function is not perfect, resulting in compromised wearing comfort, such as stuffiness after prolonged wear. To address these issues, a solution is proposed below. Summary of the Invention

[0004] The purpose of this invention is to provide a novel method for manufacturing a graphene fabric with convective heat dissipation and radiative cooling. By integrating a unique fabric structure design, multiple heat dissipation principles, and targeted manufacturing processes, it achieves efficient radiative cooling from the inside out and generates air convection heat dissipation by utilizing the concave and convective shape of the fabric, effectively improving the fabric's heat dissipation efficiency and thus enhancing the comfort of wearing or using it.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution: A novel convection-heat dissipation and radiation-cooling graphene fabric includes a fabric body with a knitted air layer structure. The fabric body includes an inner layer, an outer layer, and a connecting layer. The outer layer is made of UV-resistant fiber, the connecting layer is made of spandex, the inner layer is made of graphene fiber, and the outer layer has a surface with an uneven texture.

[0006] A method for manufacturing a novel convection-heat dissipation and radiation-cooling graphene fabric includes the following steps: S1: Make a knitted fabric blank. Prepare the graphene fiber required for the inner layer, the UV protection fiber for the outer layer, and the spandex material for the connecting layer. Use spandex as the connecting layer and use knitting technology to connect the inner graphene fiber and the outer UV protection fiber to form a knitted air layer structure fabric blank. Then, improve the properties of the fabric blank through pre-treatment and post-treatment processes. S2: Printing process. High-precision printing equipment is used for processing. The prepared printing paste is poured into the corresponding container of the printing equipment. The outer fabric blank is then placed flat on the printing platform. The printing equipment is started and the printing operation is carried out according to the predetermined printing pattern. After the printing is completed, the printed fabric is subjected to preliminary drying treatment to preliminarily solidify the printing pattern. S3: Embossing and finishing process. The outer layer of the fabric blank is processed by embossing and hot rollers to create a distinct embossing effect. Depending on the requirements, a secondary shaping operation may be performed. If secondary shaping is required, the fabric blank is shaped again using embossing and hot rollers at a temperature higher than that used in the first embossing and finishing process, thus completing the fabric production.

[0007] Preferably, the knitting process in step S1 is performed on a knitting machine. The knitting machine size is selected according to the yarn fineness range, the knitting machine speed is 20-30 revolutions per minute, the loop length is 2.5-4 cm, and the yarn padding angle is 25°-45°.

[0008] Preferably, the pretreatment process in step S1 includes the following steps: S11: Desizing: Alkaline desizing method is adopted, with sodium hydroxide concentration of 3-5 g / L, temperature of 80-90℃, and treatment time of 30-60 minutes, to remove the sizing material on the fabric blank; S12: Scouring: The amount of scouring agent used is 2-5 grams per liter, the temperature is 90-100℃, and the treatment time is 60-90 minutes. It is used to remove impurities from the fabric. S13: Bleaching: When bleaching is required, use hydrogen peroxide. The concentration of hydrogen peroxide is 3-5 g / L, the amount of bleaching stabilizer is 1-2 g / L, the temperature is 80-90℃, and the treatment time is 30-60 minutes.

[0009] Preferably, the post-processing in step S1 includes the following steps: S14: Setting: The setting temperature is 150℃ and the time is 30-60 seconds, which stabilizes the fabric dimensions and improves its smoothness and wrinkle resistance. S15: Softening treatment: The amount of softener used is 2-5 grams per liter, the treatment temperature is 40℃, and the treatment time is 20-30 minutes, in order to improve the hand feel of the fabric.

[0010] Preferably, the printing equipment in step S2 includes a digital printing machine and a screen printing machine; The digital printing machine has a printhead resolution of 300 dpi or higher, a printing speed of 5-20 m² / h, and a printing pressure of 0.2-0.5 MPa. The screen printing machine can be configured with a screen mesh size between 100 and 300, and the squeegee pressure can be controlled between 2 and 5 N to ensure uniform printing results.

[0011] Preferably, the preparation of the printing paste in step S2 includes the following steps: S21: Preparation of radiation cooling material, wherein the reflectivity of the radiation cooling material reaches more than 80% in the solar light band and the emissivity of the radiation cooling material reaches more than 70% in the atmospheric window band; the selected radiation cooling material is finely ground to make its particle size reach the nanoscale to ensure that the material can be evenly dispersed and has good adhesion in the subsequent printing process. S22: Preparation of printing paste: The ground radiation cooling material is mixed with special printing auxiliaries in a certain proportion to prepare the printing paste. The radiation cooling material accounts for 20%-30% of the printing paste. The solid content of the printing paste is controlled between 30%-50%. The viscosity of the printing paste is adjusted by adding thickeners and controlled between 1000-5000 mPa·s.

[0012] Preferably, in step S3, the temperature of the hot roller during the first embossing process is 120℃-160℃, the pressure applied by the hot roller is 3-6 kgf / cm², and the processing time of the hot roller is 20-40 seconds.

[0013] Preferably, in step S3, the temperature of the concave-convex hot roller during the secondary shaping is 140℃-170℃, the heat shaping time is 3-8 minutes, and the tension is 50-150 N / cm.

[0014] The beneficial effects of this invention are as follows: 1. High-efficiency heat dissipation The fabric of this invention achieves all-around heat dissipation through both radiative and convective heat transfer. It absorbs a large amount of thermal radiation from the human body while simultaneously radiating radiant heat outwards and reflecting away solar heat, thus achieving highly efficient radiative cooling. Furthermore, the fabric's textured surface prevents it from clinging tightly to the body, and its gaps generate strong air convection for heat dissipation, further improving the fabric's heat dissipation efficiency and effectively solving the problem of insufficient heat dissipation efficiency in traditional radiative cooling fabrics.

[0015] 2. Improve comfort Good heat dissipation allows users to feel cooler and more comfortable when wearing or using related fabric products, reducing stuffiness and discomfort caused by heat buildup.

[0016] 3. The use of spandex in the fabric ensures its elasticity and comfort, allowing it to better conform to the body's curves and dissipate heat without affecting the wearing experience.

[0017] 4. UV-resistant nylon fibers provide effective UV protection, protecting the wearer's skin from UV damage and further enhancing comfort and safety. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of an embodiment; Figure 2 This is a schematic diagram illustrating the principle of radiative cooling in an embodiment. Figure 3 This is a schematic diagram of the uneven surface of the fabric in an example.

[0019] Reference numerals: 1. Outer layer; 2. Connecting layer; 3. Inner layer. Detailed Implementation

[0020] The following description is merely a preferred embodiment of the present invention, and the scope of protection is not limited to this embodiment. All technical solutions falling within the scope of the present invention should be protected. Identical components are represented by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, while the terms "bottom" and "top," "inner" and "outer" refer to directions toward or away from the geometric center of a specific component.

[0021] like Figures 1 to 3 As shown, a novel convection-heat dissipation and radiation-cooling graphene fabric includes a fabric body with a knitted air-layer structure. The fabric body comprises an inner layer, an outer layer, and a connecting layer. The outer layer is made of UV-protective fiber, the connecting layer is made of spandex, and the inner layer is made of graphene fiber. The outer layer has a surface with unevenness, and in this design, the height difference between the uneven surface is 1 cm.

[0022] The outer layer is printed with radiation cooling material and then treated with embossed hot rollers to create a textured surface. The fabric reflects heat from sunlight and radiates a large amount of energy from the atmospheric window band through the outer radiation cooling material. At the same time, the inner graphene nylon fabric absorbs heat radiated from the human body. The textured surface of the fabric allows heat to be transferred from the human body to the fabric through thermal radiation, thereby achieving radiation cooling from the inside out and air convection heat dissipation through the gaps created by the textured surface of the fabric.

[0023] A method for manufacturing a novel convection-heat dissipation and radiation-cooling graphene fabric includes the following steps: S1: Making the knitted blank. The making of the knitted blank can be divided into the following steps: material preparation, blank making, pre-treatment process and post-treatment process.

[0024] The materials required for this design include: graphene fiber for the inner layer, UV-protective fiber for the outer layer, and spandex material for the connecting layer. Ensure that the quality and specifications of each material meet the design requirements.

[0025] The requirements for graphene nylon fabrics are as follows: the absorption rate in the human body radiation band should reach more than 90% in order to efficiently absorb heat from the human body, and the UV protection performance of the UV-resistant nylon fiber should meet the relevant protection level requirements of UPF50+.

[0026] The requirements for radiative cooling materials are: the reflectivity of the radiative cooling materials should reach more than 80% in the solar radiation band and the emissivity should reach more than 70% in the atmospheric window band, so as to ensure effective radiative cooling.

[0027] The subsequent fabrication process mainly involves knitting, using spandex as a connecting layer and employing appropriate knitting techniques to connect the inner graphene fiber and the outer UV-protective fiber, forming a nylon fabric blank with a knitted air layer structure.

[0028] The knitting process is mainly carried out on a knitting machine, and the parameters of the knitting machine are set as follows: Select the appropriate knitting machine size based on the yarn fineness. The commonly used yarn fineness range in this invention is, for example, 30D-150D. Yarn with a fineness range of 30D-75D is suitable for knitting machines with sizes E24-E32; yarn with a fineness range of 75D-150D can be knitting machines with sizes E18-E24.

[0029] The diameter of the needle cylinder can be selected according to production needs and fabric width, usually 30 inches or 34 inches; the speed of the knitting machine is controlled at 20-30 revolutions per minute to ensure fabric quality and avoid problems such as yarn breakage and uneven loops.

[0030] The loop length should be controlled between 2.5 and 4 cm, and adjusted appropriately according to the required fabric thickness and elasticity; the padding angle should be between 25° and 45° to ensure good appearance and performance of the fabric.

[0031] The pretreatment process includes the following steps: S11: Desizing: Alkaline desizing method is adopted, with sodium hydroxide concentration of 3-5 g / L, temperature of 80-90℃, and treatment time of 30-60 minutes, to remove the sizing material on the fabric blank; S12: Scouring: The amount of scouring agent used is 2-5 grams per liter, the temperature is 90-100℃, and the treatment time is 60-90 minutes. It is used to remove impurities from the fabric. S13: Bleaching: When bleaching is required, use hydrogen peroxide. The concentration of hydrogen peroxide is 3-5 g / L, the amount of bleaching stabilizer is 1-2 g / L, the temperature is 80-90℃, and the treatment time is 30-60 minutes.

[0032] The post-processing technology includes the following steps: S14: Setting: The setting temperature is 150℃ and the time is 30-60 seconds, which stabilizes the fabric dimensions and improves its smoothness and wrinkle resistance. S15: Softening treatment: The amount of softener used is 2-5 grams per liter, the treatment temperature is 40℃, and the treatment time is 20-30 minutes, in order to improve the hand feel of the fabric.

[0033] S2: Printing Process. Pour the prepared printing paste into the corresponding container of the printing equipment. Place the fabric blank, with an outer layer of UV-resistant nylon fiber, flat on the printing platform. Start the printing equipment and perform the printing operation according to the predetermined printing pattern. During the printing process, closely monitor the operating status of the printing equipment to ensure that the printing paste is continuously and evenly printed on the outer layer of the fabric. After printing, perform preliminary drying treatment on the printed fabric, which can be done by low-temperature drying or natural air drying, to evaporate the moisture in the printing paste and preliminarily solidify the printed pattern.

[0034] The printing process is performed on printing equipment. This design requires the use of high-precision printing equipment, such as a digital printing machine or a screen printing machine. The settings for the digital printing machine and the screen printing machine are as follows: The printhead resolution of the digital printing machine is set to above 300 dpi to ensure the clarity of the printed pattern; the printing speed is set between 5-20 m² / h; and the printing pressure is adjusted according to the thickness and softness of the fabric. In this design, the printing pressure is set between 0.2-0.5 MPa. The mesh count of the screen printing machine can be selected according to the particle size of the radiation cooling material and the printing precision requirements. In this design, the mesh count is 100-300 mesh, and the squeegee pressure is controlled between 2-5N to ensure uniform printing effect.

[0035] Printing requires the preparation of printing paste. The preparation of the printing paste in this design includes the following steps. S21: Preparation of radiation cooling material. The reflectivity of the radiation cooling material reaches over 80% in the solar light band, and the emissivity of the radiation cooling material reaches over 70% in the atmospheric window band. The selected radiation cooling material is finely ground to achieve a particle size of nanometers to ensure that the material can be evenly dispersed and has good adhesion in the subsequent printing process. S22: Preparation of printing paste: The ground radiation cooling material is mixed with special printing auxiliaries in a certain proportion to prepare the printing paste. The radiation cooling material accounts for 20%-30% of the printing paste. The solid content of the printing paste is controlled between 30%-50%. The viscosity of the printing paste is adjusted by adding thickeners and controlled between 1000-5000 mPa·s.

[0036] S3: Embossing and Shaping Finishing. Embossing and shaping finishing mainly involves using embossed and heated rollers to process the surface of the fabric. A secondary shaping operation can also be selected depending on the situation; this secondary shaping also involves using embossed and heated rollers to process the surface of the fabric.

[0037] During the first embossing process, the embossing hot rollers are set as follows: Temperature: Set the temperature of the embossing roller between 120℃ and 160℃. Within this temperature range, the fabric fibers can be fully deformed to form a stable and obvious embossing effect. If the temperature is too low, the ideal deformation effect cannot be achieved; if the temperature is too high, the fabric fibers may be damaged, affecting the fabric strength, hand feel, and other properties.

[0038] Pressure: For the nylon fabric involved in this invention, the pressure applied by the embossing roller is controlled at 3-6 kgf / cm². Appropriate pressure can create clear and durable embossed shapes on the fabric. Too little pressure makes it difficult to form obvious embossing, while too much pressure may cause localized excessive compression deformation or even damage to the fabric.

[0039] Processing time: Set the embossing roller processing time to 20-40 seconds. This time period ensures that the fabric fibers are fully shaped. If the time is too short, the embossing effect will not be obvious and it will easily return to flatness. If the time is too long, it may cause the fabric fibers to be overheated and compressed, resulting in a decline in fabric performance.

[0040] During the second embossing process, the embossing hot rollers are set as follows: Temperature: If secondary setting is to be performed, the temperature range should be set between 140℃ and 170℃. This temperature range helps to further solidify the texture of the fabric, making it more stable and durable. If the temperature is too low, the secondary setting effect will be poor, and if the temperature is too high, there is a risk of damaging the fabric fibers.

[0041] Time: The heat setting time should be controlled between 3 and 8 minutes. The appropriate time allows the fabric to be fully set at the set temperature, ensuring that the texture is not easily deformed during subsequent use. If the time is too short, the setting will not be sufficient, and if the time is too long, the fabric may turn yellow or harden, affecting its appearance and feel.

[0042] Tension: Based on the fabric's elasticity and thickness, the tension should be set between 50-150 N / cm. Appropriate tension ensures the fabric is evenly stressed during heat setting, resulting in a more uniform distribution of the raised and recessed shapes. Insufficient tension may cause wrinkles, affecting the smoothness of the raised and recessed effect; excessive tension may stretch the fabric excessively, altering its original dimensions and elasticity.

[0043] Graphene possesses excellent electrical and thermal properties. Thermally, in addition to having a high absorption rate (over 90%) within the human body radiation band, it also exhibits good thermal conductivity, rapidly conducting absorbed heat and further promoting heat transfer and dissipation within the fabric. Simultaneously, graphene's two-dimensional structure provides a large specific surface area, enabling more efficient heat exchange with the surrounding environment. Therefore, it plays a crucial role in heat absorption from the human body and heat dispersion within the fabric.

[0044] UV-protective nylon fibers are achieved by adding UV absorbers during the manufacturing process or by employing special fiber surface treatment techniques. These UV absorbers absorb the energy of ultraviolet rays, converting it into heat or other forms of energy, thus preventing UV rays from penetrating the fabric and providing good UV protection for the user. Simultaneously, the specially treated fiber surface structure can also reflect some ultraviolet rays, further enhancing the UV protection performance.

[0045] The specific embodiments described above further illustrate the technical problems, technical solutions, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A novel convection-heat dissipation and radiation-cooling graphene fabric, comprising a fabric body, wherein the fabric body adopts a knitted air layer structure, and the fabric body includes an inner layer, an outer layer, and a connecting layer, characterized in that, The outer layer is made of UV-resistant fiber, the connecting layer is made of spandex, the inner layer is made of graphene fiber, and the outer layer has a surface with an uneven texture.

2. The method for manufacturing a novel convection-heat dissipation and radiation-cooling graphene fabric according to claim 1, characterized in that, Includes the following steps, S1: Make a knitted fabric blank. Prepare the graphene fiber required for the inner layer, the UV protection fiber for the outer layer, and the spandex material for the connecting layer. Use spandex as the connecting layer and use knitting technology to connect the inner graphene fiber and the outer UV protection fiber to form a knitted air layer structure fabric blank. Then, improve the properties of the fabric blank through pre-treatment and post-treatment processes. S2: Printing process. High-precision printing equipment is used for processing. The prepared printing paste is poured into the corresponding container of the printing equipment. The outer fabric blank is then placed flat on the printing platform. The printing equipment is started and the printing operation is carried out according to the predetermined printing pattern. After the printing is completed, the printed fabric is subjected to preliminary drying treatment to preliminarily solidify the printing pattern. S3: Embossing and finishing process. The outer layer of the fabric blank is processed by embossing and hot rollers to create a distinct embossing effect. Depending on the requirements, a secondary shaping operation may be performed. If secondary shaping is required, the fabric blank is shaped again using embossing and hot rollers at a temperature higher than that used in the first embossing and finishing process, thus completing the fabric production.

3. The method for manufacturing a novel convection-heat dissipation and radiation-cooling graphene fabric according to claim 2, characterized in that, The knitting process in step S1 is performed on a knitting machine. The machine size is selected according to the fineness range of the yarn. The speed of the knitting machine is 20-30 revolutions per minute. The loop length is 2.5-4 cm. The yarn padding angle is 25°-45°.

4. The method for manufacturing a novel convection-heat dissipation and radiation-cooling graphene fabric according to claim 2, characterized in that, The pretreatment process in step S1 includes the following steps: S11: Desizing: Alkaline desizing method is adopted, with sodium hydroxide concentration of 3-5 g / L, temperature of 80-90℃, and treatment time of 30-60 minutes, to remove the sizing material on the fabric blank; S12: Scouring: The amount of scouring agent used is 2-5 grams per liter, the temperature is 90-100℃, and the treatment time is 60-90 minutes. It is used to remove impurities from the fabric. S13： Bleaching: When bleaching is required, hydrogen peroxide should be used. The concentration of hydrogen peroxide should be 3-5 g / L, the amount of bleaching stabilizer should be 1-2 g / L, the temperature should be 80-90℃, and the treatment time should be 30-60 minutes.

5. The method for manufacturing a novel convection-heat dissipation and radiation-cooling graphene fabric according to claim 2, characterized in that, The post-processing in step S1 includes the following steps. S14: Setting: The setting temperature is 150℃ and the time is 30-60 seconds, which stabilizes the fabric dimensions and improves its smoothness and wrinkle resistance. S15: Softening treatment: The amount of softener used is 2-5 grams per liter, the treatment temperature is 40℃, and the treatment time is 20-30 minutes, in order to improve the hand feel of the fabric.

6. The method for manufacturing a novel convection-heat dissipation and radiation-cooling graphene fabric according to claim 2, characterized in that, The printing equipment in step S2 includes a digital printing machine and a screen printing machine; The digital printing machine has a printhead resolution of 300 dpi or higher, a printing speed of 5-20 m² / h, and a printing pressure of 0.2-0.5 MPa. The screen printing machine can be configured with a screen mesh size between 100 and 300, and the squeegee pressure can be controlled between 2 and 5 N to ensure uniform printing results.

7. The method for manufacturing a novel convection-heat dissipation and radiation-cooling graphene fabric according to claim 2, characterized in that, The preparation of the printing paste in step S2 includes the following steps: S21: Preparation of radiation cooling material, wherein the reflectivity of the radiation cooling material reaches more than 80% in the solar light band and the emissivity of the radiation cooling material reaches more than 70% in the atmospheric window band. The selected radiation cooling material is finely ground to achieve a particle size of nanometers to ensure that the material can be evenly dispersed and has good adhesion during the subsequent printing process. S22: Preparation of printing paste: The ground radiation cooling material is mixed with special printing auxiliaries in a certain proportion to prepare the printing paste. The radiation cooling material accounts for 20%-30% of the printing paste. The solid content of the printing paste is controlled between 30%-50%. The viscosity of the printing paste is adjusted by adding thickeners and controlled between 1000-5000 mPa·s.

8. The method for manufacturing a novel convection-heat dissipation and radiation-cooling graphene fabric according to claim 2, characterized in that, In step S3, the temperature of the hot roller during the first embossing process is 120℃-160℃, the pressure applied by the hot roller is 3-6 kgf / cm², and the processing time of the hot roller is 20-40 seconds.

9. The method for manufacturing a novel convection-heat dissipation and radiation-cooling graphene fabric according to claim 2, characterized in that, In step S3, the temperature of the concave-convex hot roller during the secondary shaping is 140℃-170℃, the heat shaping time is 3-8 minutes, and the tension is 50-150 N / cm.

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