Carbon nanotube film flexible electric heating composite cloth and preparation method thereof

Abstract

The invention provides a carbon nano tube film flexible electric heating composite fabric and a preparation method, and solves the technical problems that the existing heating fabric cannot be folded for multiple times, is poor in comfort and cannot be cut, the carbon nano tube film flexible electric heating composite fabric comprises an antibacterial layer, a waterproof layer, a heating layer and a substrate layer, the waterproof layer comprises an upper waterproof layer and a lower waterproof layer, the device is characterized in that an upper waterproof layer and an antibacterial layer are sequentially arranged at the upper end of the heating layer, a lower waterproof layer and a substrate layer are sequentially arranged at the lower end of the heating layer, and the heating layer comprises a heating element and a flexible electrode; the heating element is a carbon nanotube film made of multi-walled carbon nanotubes with two closed ends and placed in the same direction, the conductivity of the heating element in the longitudinal direction is larger than that in the transverse direction, and the surface of the carbon nanotube film is electrically connected with the flexible electrode in a longitude and latitude crossing mode. The method can be widely applied to the technical field of cloth preparation.

Description

Technical Field

[0001] The present application belongs to the technical field of fabric preparation, and more specifically, relates to a carbon nanotube film flexible electrically heated composite fabric and a preparation method thereof. Background Art

[0002] In recent years, with the improvement of people's living standards, people have higher and higher material requirements, especially in terms of clothing. In the cold winter, people are dissatisfied with the traditional bulky warm clothing, which requires the fabrics used to process clothing to have the characteristics of heating, breathability, waterproof, wear-resistant and light. Electric heating materials all use the thermal effect of electric current, and heating materials are divided into metal and non-metal materials. Among them, metal heating materials mainly include precious metals such as platinum, iron, copper, silver, aluminum, high-temperature melting point metals and alloy materials. The metal heating materials are made into conductive yarns, and then woven into other materials to make heating elements. Non-metallic heating materials mainly include carbon-based materials, silicon dioxide, transition metal carbides, silicon carbide, polypyrrole, etc. Although there has been great progress in the research of metal materials, there are still considerable challenges in its practical application. Metal materials consume a lot of energy during the heating process, and the fabrics made of metal heating materials are light, flexible, thin, corrosion-resistant, waterproof, washable and wear-resistant, which are all problems that need to be further solved.

[0003] With the development of carbon nanotubes, they are gradually coming into people's vision. Carbon nanotubes, also known as buckytubes, have very excellent mechanical, electrical and chemical properties. The radial size of carbon nanotubes is nanometer-level, and the axial size is micrometer-level. Both ends of the tube are sealed. When the current passes through the carbon nano grid, a large amount of heat will be generated. After a certain regular arrangement, it can form a carbon nanotube film. After the carbon nanotube film is compounded with other materials, it can still maintain its own conductivity, but the power consumption is less than that of metal heating materials. Carbon nanotube film is thin and flexible. At present, there are many linear surface heat sources, heating modules, and heating fabrics based on carbon nanotube films, carbon nanotube fibers, etc.

[0004] Patent CN109203611A discloses a nano-fabric with heating function, wherein the nano-fabric consists of a quick-drying layer, a thermal insulation and waterproof layer, a heating layer and an external power cord. The quick-drying layer is made of flame-retardant nitrile chloroprene fiber, cotton fiber and linen fiber, and the ratio is 7:1.6:1. .4; the thermal insulation and waterproof layer is made of deoxidized cotton, polyester fiber, viscose fiber and spandex, and is blended in a ratio of 3:2:1:1, and is smoked with a solution mixed with distilled water and white vinegar, and then immersed in a solution of polyacrylate, polysiloxane, polyvinyl chloride and rubber in a ratio of 1.1:0.9:1.1:0.5 for half an hour, and then dried, and repeated twice; the heating layer is made of graphene heating wire and textile silk thread, and is obtained by warp and weft weaving with the electrode wire, and the semi-finished product is immersed in a solvent prepared by isocyanate, polyol, diol, halogen-free flame retardant masterbatch and polyethylene terephthalate in a ratio of 3.5:4.5:0.7:0.:0.5 for half an hour, and then the immersed semi-finished product is dried.

[0005] Patent CN101400198A discloses a surface heat light source, including a first electrode, a second electrode, and a carbon nanotube film structure. The first electrode and the second electrode can be arranged on the same surface of the carbon nanotube film structure or on different surfaces of the carbon nanotube film structure; the carbon nanotube structure includes at least two layers of overlapping and cross-arranged carbon nanotube films, and adjacent carbon nanotube films are tightly bonded by van der Waals forces; at least two electrodes are arranged at intervals and are electrically connected to the heating element.

[0006] In the above structure, the first heating fabric uses graphene heating wire as the heating material. The graphene material substrate is relatively hard and cannot be folded multiple times, and the comfort is poor. During use, it cannot be cut because its heating layer is externally connected to the power cord. Although the second heating fabric considers the problem of insulation and breathability, it does not involve the performance characteristics of waterproof and antibacterial, and the flexible heating element does not consider the heating electrode problem, and cannot achieve uniform heating and efficient heating during application. Therefore, the present invention provides a carbon nanotube film flexible electric heating composite fabric and a preparation method. Summary of the invention

[0007] To achieve the above objectives, the present invention provides a carbon nanotube film flexible electric heating composite fabric and a preparation method thereof, which has the advantages of good flexibility, strong waterproofness, good air permeability, high insulation safety, antibacterial and cuttable.

[0008] The present invention provides a carbon nanotube film flexible electric heating composite fabric, comprising an antibacterial layer, a waterproof layer, a heating layer and a base layer, wherein the waterproof layer comprises an upper waterproof layer and a lower waterproof layer, the upper end of the heating layer is sequentially provided with an upper waterproof layer and an antibacterial layer, the lower end of the heating layer is sequentially provided with a lower waterproof layer and a base layer, and the heating layer comprises a heating element and a flexible electrode; the heating element is a carbon nanotube film made of multi-walled carbon nanotubes placed in the same direction with closed ends, the electrical conductivity in the longitudinal direction is greater than that in the transverse direction, and the surface of the carbon nanotube film is electrically connected to the flexible electrode in a warp and weft cross manner.

[0009] Preferably, the flexible electrodes are spaced 10-20 mm in the latitudinal direction and 20-30 mm in the longitudinal direction, and the width of the flexible electrodes is 4-5 mm.

[0010] Preferably, the surface density of the carbon nanotube film is 8-10 g / m 2 , the conductivity is 0.8*10 5 S / m or above, thickness is 0.01-0.05mm.

[0011] Preferably, the antibacterial layer is woven from bamboo pulp fiber, flame retardant nitrile fiber, polyester low-elastic yarn, and polypropylene tree in a ratio of 4:3:1.6:1.4.

[0012] Preferably, the waterproof layer is woven from polytetrafluoroethylene, spandex, polyurea, and polyester fibers in a ratio of 1.2:4.2:0.8:3.8.

[0013] Preferably, the base layer is made of polypropylene, and the thickness of the base layer is 0.1-0.5 mm.

[0014] Preferably, the antibacterial layer and the upper waterproof layer, the upper waterproof layer and the heating layer, the heating layer and the lower waterproof layer, and the lower waterproof layer and the base layer are all bonded with glue, and the glue is made of moisture-curing polyurethane glue (PUR).

[0015] At the same time, the present invention provides a carbon nanotube film flexible electric heating composite fabric and a preparation method, the specific steps are as follows: (1) Preheat the base layer, then spray glue on the surface of the base layer using a glue dispenser, cover the lower waterproof layer on the base layer by hot pressing, and cool it; (2) Spray glue on the lower waterproof layer with a glue dispenser, place the carbon nanotube film, cross-place the flexible electrodes in the longitude and latitude, and place the rest of the electrodes inside the carbon nanotube film. Spray glue, bond the preheated upper waterproof layer to the heating layer by hot pressing, and cool it. (3) Spray glue on the surface of the upper waterproof layer using a glue dispenser, preheat the antibacterial layer, and then cover the antibacterial layer on the upper waterproof layer by hot pressing, and let it stand and cool to room temperature.

[0016] Preferably, in steps (1)-(3), the preheating temperature is 50-60°C; In steps (1) to (3), the hot melt temperature during spraying by the dispensing machine is 100-110°C, the width is 0.5-2mm, the interval is 5-10mm, the thickness is 0.1-0.5mm, and the cooling time is 30-50s; In steps (1) to (3), the hot pressing pressure is 10-20 MPa, the hot pressing time is 20-50 s, and the cooling time is 30-50 s.

[0017] The beneficial effects of the present invention are: (1) The present invention provides a carbon nanotube film flexible electric heating composite fabric, comprising a heating layer, the heating layer comprising a heating element and a flexible electrode, the heating element being multi-walled carbon nanotubes placed in the same direction, adjacent multi-walled carbon nanotubes being tightly bonded by van der Waals forces, so that the conductivity of the carbon nanotube film in the longitudinal direction is greater than that in the transverse direction, the flexible electrode is adhered to the carbon nanotube film by a method of cross-placement of longitude and latitude, and is electrically connected to the carbon nanotube film. This structural method, on the one hand, enables the carbon nanotube film flexible electric heating composite fabric to maintain a certain degree of flexibility and better fit the human body curve design, and on the other hand, enables the carbon nanotube film flexible electric heating composite material to have the characteristics of uniform heating, stable electric heating performance, low power consumption and high efficiency.

[0018] (2) The present invention provides a carbon nanotube film flexible electric heating composite fabric. The antibacterial layer adds bamboo pulp fiber to make the fabric have good air permeability, water absorption, wear resistance and good dyeability, and also has the function of anti-ultraviolet radiation; the use of flame-retardant nitrile chlorofiber makes the fabric acid-resistant and chemical-resistant to prevent the skin from being burned by melt droplets during combustion. The waterproof layer combines the chemical resistance and heat resistance of polytetrafluoroethylene, the elasticity of spandex, and the good thermal stability of polyurea and polyester fibers, so that the final product has waterproof and good flexibility in a variety of environments. Through the combined action of the antibacterial layer, the waterproof layer, and the heating layer, the fabric can be made to have the characteristics of antibacterial and breathable, waterproof and heat-insulating, good flexibility, thin thickness, washability, and uniform heating.

[0019] (2) The present invention provides a method for preparing a carbon nanotube film flexible electric heating composite fabric. By combining the method of spraying glue with a dispensing machine and hot pressing, the distribution of glue can be accurately controlled to ensure the uniform distribution of glue on the fabric, thereby improving the consistency and quality of the fabric; at the same time, the durability of the fabric is increased by hot pressing, such as waterproof and windproof functions; finally, the antibacterial layer, waterproof layer, heating layer and substrate are perfectly glued by glue to make a complete carbon nanotube film flexible electric heating composite fabric. The present invention has low manufacturing cost, stable electric heating performance and high efficiency, low price and cost, and is easy to repair. It is particularly suitable for making winter cold-resistant clothing and heating health care products. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 A top view of the electrical connection between the flexible electrode and the carbon nanotube film in the present invention; Figure 3 It is a schematic diagram of the dispensing path in the present invention.

[0022] Explanation of symbols in the figure: 1. Antibacterial layer; 2. Upper waterproof layer; 3. Lower waterproof layer; 4. Heating layer; 5. Base layer; 6. Flexible electrode; 7. Carbon nanotube film; 8. Glue. DETAILED DESCRIPTION

[0023] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application. Example

[0024] A carbon nanotube film flexible electric heating composite fabric provided in an embodiment of the present application is now described. Figure 1-2As shown, a carbon nanotube film flexible electric heating composite fabric comprises an antibacterial layer 1, a waterproof layer, a heating layer 4 and a base layer 5, wherein the waterproof layer comprises an upper waterproof layer 2 and a lower waterproof layer 3, the upper end of the heating layer 4 is provided with an upper waterproof layer 2 and an antibacterial layer 1 in sequence, the lower end of the heating layer 4 is provided with a lower waterproof layer 3 and a base layer 5 in sequence, the heating layer 4 comprises a heating element and a flexible electrode, the heating element is a carbon nanotube film 7 made of multi-walled carbon nanotubes with closed ends, the structure of the carbon nanotube film 7 is multi-walled carbon nanotubes placed in the same direction, adjacent multi-walled carbon nanotubes are tightly combined by van der Waals force, the conductivity in the longitudinal direction is greater than that in the transverse direction, and the surface of the carbon nanotube film 7 is electrically connected to the flexible electrode 6 by the warp and weft cross; wherein the carbon nanotube film 7 can also be a multi-walled carbon nanotube structure placed in the same direction and arranged in a wavy shape. This structural mode, on the one hand, enables the carbon nanotube film flexible electric heating composite fabric to maintain a certain flexibility and better fit the human body curve design, and on the other hand, the carbon nanotube film flexible electric heating composite material has the characteristics of uniform heating, stable electric heating performance, low power consumption and high efficiency.

[0025] In the present invention, specifically, Figure 1-2 As shown, the flexible electrode 6 is made of copper, the flexible electrodes 6 are placed at intervals of 20-30 mm in the longitude direction, and the latitude flexible electrodes 6 are led out in the longitude direction, the intervals in the latitude direction are 10-20 mm, the width of the flexible electrode is 4-5 mm, the flexible electrodes 6 are led out at the highest and lowest ends of the latitude and connected to an external power supply, and the maximum temperature that the flexible electrode 6 can withstand is higher than the temperature generated when the carbon nanotube film 7 works at maximum power.

[0026] In the present invention, the length and width of the carbon nanotube film 7 are not limited, and the film can be made according to actual needs to meet the needs of special parts of the human body. The surface density of the carbon nanotube film 7 is 8-10g / m 2 , the conductivity is 0.8*10 5 S / m or above, thickness is 0.01-0.05mm, and it needs to maintain a certain flexibility and be able to be bent.

[0027] In the present invention, the antibacterial layer 1 is made of bamboo pulp fiber, flame-retardant nitrile chlorofiber fiber, polyester low-elastic yarn, and polypropylene resin, and is mixed and woven in a ratio of 4:3:1.6:1.4. After weaving, it is smoked with a 20% white vinegar solution, then sprayed with neem leaf extract, and finally dried at high temperature to form an antibacterial layer 1 with a thickness of 0.08-0.15 mm, which can make the antibacterial layer 1 have the characteristics of antibacterial, breathable, dry and soft.

[0028] In the present invention, the upper waterproof layer 2 and the lower waterproof layer 3 are both made of polytetrafluoroethylene, spandex, polyurea, and polyester fibers, and are woven in a ratio of 1.2:4.2:0.8:3.8. They are immersed in a solution of silicone resin, rubber 8, and distilled water in a ratio of 1.6:1.1:7.3 for 1 hour, and then taken out and dried naturally to form a waterproof layer with a thickness of 0.01-0.2mm. Because its solution has waterproof and breathable properties, it can allow water vapor molecules with a diameter of 0.0004pm to pass through and block water droplet molecules with a diameter of 0.1-0.3mm. The waterproof layer has the characteristics of waterproof, heat-insulating, breathable, and environmentally friendly.

[0029] In the present invention, the base layer 5 is a common fabric with a heat storage function, the material of the base layer 5 is polypropylene, and the thickness of the base layer is 0.1-0.5 mm.

[0030] In the present invention, glue 8 is provided between the upper waterproof layer 2 and the heating layer 4, between the lower waterproof layer 3 and the heating layer 4, between the upper waterproof layer 2 and the antibacterial layer 1, and between the lower waterproof layer 3 and the base layer 5. The material of the glue 8 is a single-component moisture-curing polyurethane glue (PUR). The glue 8 is evenly sprayed on the entire layer using a dispensing machine, and is applied along the following lines: Figure 3 The path shown. Example

[0031] The present invention provides a method for manufacturing a carbon nanotube film flexible electrically heated composite fabric, which specifically comprises the following steps: (1) Preheat the base layer 5 at 50-60°C, and then use the dispensing machine 8 at 100-110°C according to Figure 3 The path shown is to spray glue 8 on the surface of the base layer 5, the glue 8 has a width of 0.5-2mm, an interval of 5-10mm, and a thickness of 0.1-0.5mm, and the lower waterproof layer 3 is hot-pressed on the base layer 5 at a pressure of 10-20MPa for 20-50s, and then cooled for 30-50s; (2) Use a dispensing machine 8 at 100-110°C according to Figure 3 The path shown is to spray glue 8 on the surface of the lower waterproof layer 3, the width of the glue 8 is 0.5-2mm, the interval is 5-10mm, and the thickness is 0.1-0.5mm, and then place a carbon nanotube film 7 on the surface of the lower waterproof layer, and place flexible electrodes 6 crosswise in longitude and latitude. Except for the protruding electrodes, the rest of the parts are all within the carbon nanotube film 7. Spray glue at 100-110°C, the width of the glue 8 is 0.5-2mm, the interval is 5-10mm, and the thickness is 0.1-0.5mm. After preheating the upper waterproof layer 2 at 50-60°C, the upper waterproof layer 2 is hot-pressed on the heating layer 4 at a pressure of 10-20MPa for 20-50s, and cooled for 30-50s; (3) Use a dispensing machine at 100-110℃ according to Figure 3The path shown is to spray a layer of glue 8 on the upper waterproof layer 2, the glue 8 has a width of 0.5-2mm, an interval of 5-10mm, and a thickness of 0.1-0.5mm. After preheating the antibacterial layer 1 at 50-60°C, the antibacterial layer 1 is hot-pressed on the upper waterproof layer 2 at a pressure of 10-20MPa for 20-50s, and then left to cool to room temperature.

[0032] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A carbon nanotube film flexible electric heating composite fabric, comprising an antibacterial layer, a waterproof layer, a heating layer and a base layer, wherein the waterproof layer comprises an upper waterproof layer and a lower waterproof layer, characterized in that: The upper end of the heating layer is provided with an upper waterproof layer and an antibacterial layer in sequence, the lower end of the heating layer is provided with a lower waterproof layer and a base layer in sequence, and the heating layer includes a heating element and a flexible electrode; the heating element is a carbon nanotube film made of multi-walled carbon nanotubes placed in the same direction with closed ends, and its electrical conductivity in the longitudinal direction is greater than that in the transverse direction, and the surface of the carbon nanotube film is electrically connected to the flexible electrode in a cross-warp and weft manner.

2. The carbon nanotube film flexible electric heating composite fabric according to claim 1, characterized in that: The flexible electrodes are spaced 10-20 mm apart in the latitude direction and 20-30 mm apart in the longitude direction, and the width of the flexible electrodes is 4-5 mm.

3. The carbon nanotube film flexible electric heating composite fabric according to claim 1, characterized in that: The surface density of the carbon nanotube film is 8-10 g / m 2 , the conductivity is 0.8*10 5 S / m or above, thickness is 0.01-0.05mm.

4. The carbon nanotube film flexible electric heating composite fabric according to claim 1, characterized in that: The antibacterial layer is woven from bamboo pulp fiber, flame-retardant nitrile fiber, polyester low-elastic yarn, and polypropylene tree in a mixed ratio of 4:3:1.6:1.

4.

5. The carbon nanotube film flexible electric heating composite fabric according to claim 1, characterized in that: The waterproof layer is woven from polytetrafluoroethylene, spandex, polyurea and polyester fiber in a ratio of 1.2:4.2:0.8:3.

8.

6. The carbon nanotube film flexible electric heating composite fabric according to claim 1, characterized in that: The base layer is made of polypropylene, and the thickness of the base layer is 0.1-0.5 mm.

7. The method for preparing the carbon nanotube film flexible electric heating composite fabric according to claim 1, characterized in that: The antibacterial layer and the upper waterproof layer, the upper waterproof layer and the heating layer, the heating layer and the lower waterproof layer, and the lower waterproof layer and the base layer are all bonded with glue, and the glue is made of moisture-curing polyurethane glue (PUR).

8. A method for preparing the carbon nanotube film flexible electric heating composite fabric as claimed in claims 1 to 7, characterized in that: Here are the steps: (1) Preheat the base layer, then spray glue on the surface of the base layer using a glue dispenser, cover the lower waterproof layer on the base layer by hot pressing, and cool it; (2) Spray glue on the lower waterproof layer with a glue dispenser, place the carbon nanotube film, cross-place the flexible electrodes in the longitude and latitude, and place the rest of the electrodes inside the carbon nanotube film. Spray glue, bond the preheated upper waterproof layer to the heating layer by hot pressing, and cool it. (3) Use a glue dispenser to spray glue on the surface of the upper waterproof layer, preheat the antibacterial layer, and then cover the antibacterial layer on the upper waterproof layer by hot pressing, and let it stand and cool to room temperature.

9. The method for preparing the carbon nanotube film flexible electric heating composite fabric according to claim 8, characterized in that: In steps (1) to (3), the preheating temperature is 50-60°C; In steps (1) to (3), the hot melt temperature during spraying by the dispensing machine is 100-110°C, the width is 0.5-2mm, the interval is 5-10mm, the thickness is 0.1-0.5mm, and the cooling time is 30-50s; In steps (1) to (3), the hot pressing pressure is 10-20 MPa, the hot pressing time is 20-50 s, and the cooling time is 30-50 s.

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