Composite fabric with heating function and preparation method thereof

Abstract

The invention discloses a composite fabric with a heating function and a preparation method thereof, and relates to the technical field of composite fabrics, pure polyaniline powder is prepared as a conductive polymer, the preparation method is relatively simple, the production cost is reduced, the expandability of preparation is improved, polyaniline has good conductivity, and the composite fabric has a heating function. The conductivity of polyaniline can be regulated and controlled through oxidation-reduction reaction, so that the polyaniline can adapt to the requirements of different application scenes, and the adjustable conductivity is realized.

Description

Technical Field

[0001] The invention relates to the technical field of composite fabrics, in particular to a composite fabric with a heating function and a preparation method thereof. Background Art

[0002] With the continuous improvement of people's living standards and the development of textile technology and material science, people are no longer satisfied with keeping warm by increasing the thickness of clothing in cold environments. It is this constant pursuit of wearing comfort and warmth that has led people to explore integrating heating elements into fabrics to create more advanced and functional clothing. In view of this, composite fabrics with heating functions have emerged, which can reduce the thickness of clothing and will not affect people's actions in cold environments. A composite fabric with heating function and a preparation method thereof can provide convenience for staff.

[0003] The defects of existing composite fabrics are: 1. Patent document KR101025978B1 discloses a transparent heating jacket, an upper fabric and a lower fabric. The transparent heating jacket disclosed above, the upper fabric and the lower fabric mainly consider the problem of how to connect multiple heating wires in parallel on the upper fabric and the lower fabric, and does not consider the problem of facilitating the adjustment of conductivity.

[0004] 2. Patent document KR102113552B1 discloses smart heating fabric clothing. The above-disclosed smart heating fabric clothing mainly considers how to use the user's voice to check the user's age and gender to provide heating to the part suitable for the user's age and gender, and it continuously monitors whether there is body contact with the user to provide concentrated heating to the part where body contact does not often occur. It does not consider enhancing the overall structural stability, which helps to improve the durability and deformation resistance of the conductive fiber layer.

[0005] 3. Patent document JP4911190B2 discloses comfortable fabrics. The comfortable fabrics disclosed above mainly consider the problem of how to provide a comfortable fabric that is light in weight, cool, and keeps cool for a long time. It does not consider the problem of enabling the conductive fiber layer to maintain structural stability in a high temperature environment and enhancing the service life of the conductive fiber layer.

[0006] 4. Patent document CN113263790B discloses a functional composite fabric and a preparation method thereof. The above-disclosed functional composite fabric and a preparation method thereof mainly consider how to make the adhesion between carbon fiber and base fabric high, the peel strength high, the tear strength high, the effective functional capacity retention rate of carbon fiber high, the air permeability good, the moisture permeability good, the flexibility good, and the process simple, but does not consider the problem of lightweight design of composite fabric. Summary of the invention

[0007] The object of the present invention is to provide a composite fabric with heating function and a preparation method thereof, so as to solve the problems raised in the above background technology.

[0008] To achieve the above object, the present invention provides the following technical solution: a composite fabric with heating function and a preparation method thereof, wherein the preparation of the composite fabric comprises the following steps: S1, using aniline as a raw material to produce polyaniline through a polymerization reaction, and pretreating the polyaniline to obtain pure polyaniline powder; S2, obtaining carbon fiber by high temperature treatment of polypropylene fiber, mixing, drying, spinning and curing the carbon fiber with polyaniline powder to obtain a conductive fiber layer; S3, adding polyimide powder into dimethyl sulfoxide solvent to dissolve to form a coating solution, applying it on the conductive fiber layer through a wetting device, and obtaining a heating layer after cooling; S4. Through a hot pressing process, the heating layer and the cotton fabric are compounded into a finished heating fabric using hot-melt polyurethane thermoplastic adhesive.

[0009] Preferably, the preparation method of the pure polyaniline powder in S1 is as follows: Aniline with a concentration of 5 mol / L was selected, and the aniline was dissolved in a hydrochloric acid solvent with a hydrochloric acid concentration of 1 mol / L. The solution was heated to 25°C and the reaction time was 24 hours. Oxygen was introduced into the aniline solution to promote polymerization reaction to produce conductive polyaniline. After the reaction was completed, saturated salt water was slowly added to cause precipitation reaction of the polyaniline in the solution. The product was filtered, washed and dried to obtain a polyaniline product. Recrystallization: the polyaniline product is placed in a phenol solvent and heated to 80-100°C, the polyaniline product is dissolved in the phenol solvent, and then cooled to 0-10°C to allow the polyaniline product to crystallize again, and then filtered, washed and dried to obtain pure polyaniline; Pure polyaniline is crushed by a pulverizer and passed through a 100-140 mesh sieve to obtain polyaniline powder. Through redox reactions, electrons can be introduced or removed from the polyaniline molecules, thereby adjusting their conductivity.

[0010] Preferably, the preparation method of the carbon fiber in S2 is as follows: Expose the polypropylene fiber to a high temperature environment for stabilization treatment. The temperature is set between 200℃ and 300℃ to promote the graphitization of the fiber. The organic matter will decompose and volatilize, causing the fiber to gradually transform into a graphite structure. The graphitized polypropylene fiber is heated to 800-3000° C. in a nitrogen inert gas for 5-40 hours to obtain carbon fiber.

[0011] Preferably, the preparation method of the conductive fiber layer in S2 is as follows: Add polyaniline particles and carbon fibers into a mixer, add a dissolving solvent and a free radical initiator, stir and mix at a speed of 200-500 r / min for 1-3 hours to obtain a mixture, and dry the mixture at a drying temperature of 80-120° C. for 4-12 hours; The dried mixture is formed into conductive fibers by a spinning technique, and the conductive fibers are woven into a conductive fiber layer; The conductive fiber layer is cured by a thermal curing method. The conductive fiber layer is placed in an oven with the temperature set at 180-200° C. and the time controlled at 40-60 minutes.

[0012] Preferably, the dissolving solvent in S2 is 15%-30% dimethylformamide, the free radical initiator is 0.5%-2% benzoyl peroxide, and the polyaniline particles, carbon fibers, the dissolving solvent and the free radical initiator are mixed in a weight ratio of 1:3:0.6-1.2:0.02-0.08.

[0013] Preferably, the concentration of polyimide in the coating solution in S3 is 10%.

[0014] Preferably, the wetting device in S3 infiltrates the coating solution onto the conductive fiber layer through the wetting device, so that the conductive fiber layer fully absorbs the coating solution, and obtains the heating layer after cooling.

[0015] Preferably, the preparation process of the hot melt polyurethane thermoplastic adhesive in S4 is: The polyurethane prepolymer, plasticizer and additive are heated in a mixer and fully stirred to form a mixture, wherein the polyurethane prepolymer content in the mixture is 75%-94%, the plasticizer content is 5%-20%, and the additive content is 1%-5%. The mixture is heated to 180-200°C for 30-120 minutes to promote the polymerization reaction of the polyurethane prepolymer to generate a hot-melt polyurethane thermoplastic adhesive; The polyurethane prepolymer is formed by the reaction of isocyanate and polyol, the plasticizer is dibutyl diformate or polyether polyol, and the auxiliary agent is a curing agent composed of isocyanate and polyate.

[0016] Preferably, the hot pressing process in S4: First, the cotton fabric is laid on the workbench, and the hot-melt adhesive coating machine is used to evenly apply the hot-melt polyurethane thermoplastic adhesive on one side of the cotton fabric to form a first adhesive layer, and the heating layer is laid on the surface of the adhesive layer. The hot-melt adhesive coating machine is used again to evenly apply the hot-melt adhesive on the surface of the heating layer to form a second adhesive layer, and another cotton fabric is laid on the surface of the second adhesive layer to obtain a prefabricated fabric; The prefabricated fabric is compounded by a hot pressing device, the hot pressing temperature is set to 150-200°C, the hot pressing pressure is set to 0.5-2MPa, and the hot pressing time is set to 5-30min to obtain a composite fabric.

[0017] 1. The present invention prepares pure polyaniline powder as a conductive polymer, and the preparation method is relatively simple, which reduces the production cost and improves the scalability of the preparation. At the same time, polyaniline has good conductivity, and the conductive properties of polyaniline can be regulated by redox reaction to adapt it to the requirements of different application scenarios and achieve adjustable conductivity.

[0018] 2. The present invention prepares conductive fibers by mixing polyaniline particles with carbon fibers. Carbon fibers have excellent mechanical properties such as light weight, high strength and high modulus. By mixing with polyaniline, the mechanical properties of the conductive fibers can be improved, making them more resilient and flexible. After being woven into a conductive fiber layer and then thermally cured, a tighter bond can be formed between the fibers in the conductive fiber layer, thereby enhancing the overall structural stability, which helps to improve the durability and deformation resistance of the conductive fiber layer.

[0019] 3. The present invention adds polyimide powder into dimethyl sulfoxide solvent to dissolve to form a coating solution, and applies the coating solution as a coating on the conductive fiber layer to form a heating layer, so that the heating layer has excellent insulation properties and can keep the conductive fiber layer structurally stable in a high temperature environment, thereby enhancing the service life of the conductive fiber layer.

[0020] 4. The present invention prepares hot-melt polyurethane thermoplastic adhesive, which can form a strong bond during the hot pressing process to ensure a strong bond between the cotton fabric and the conductive fiber layer, which helps to improve the overall strength and durability of the composite material. At the same time, the polyurethane thermoplastic adhesive has a lower density, which helps to lightweight design. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a flow chart of the present invention. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" means fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, and internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention are understood according to specific circumstances. Example

[0025] See also Figure 1 , Figure 2 The present invention provides an embodiment: a composite fabric with heating function and a preparation method thereof, wherein the preparation of the composite fabric comprises the following steps: S1, using aniline as a raw material to produce polyaniline through a polymerization reaction, and pretreating the polyaniline to obtain pure polyaniline powder; S2, obtaining carbon fiber by high temperature treatment of polypropylene fiber, mixing, drying, spinning and curing the carbon fiber with polyaniline powder to obtain a conductive fiber layer; S3, adding polyimide powder into dimethyl sulfoxide solvent to dissolve to form a coating solution, applying it on the conductive fiber layer through a wetting device, and obtaining a heating layer after cooling; S4. Through a hot pressing process, the heating layer and the cotton fabric are compounded into a finished heating fabric using hot-melt polyurethane thermoplastic adhesive. Example

[0026] See also Figure 1 , Figure 2 , an embodiment provided by the present invention: a composite fabric with heating function and a preparation method thereof, the preparation method of the pure polyaniline powder in S1 is as follows: Aniline with a concentration of 5 mol / L was selected, and the aniline was dissolved in a hydrochloric acid solvent with a hydrochloric acid concentration of 1 mol / L. The solution was heated to 25°C and the reaction time was 24 hours. Oxygen was introduced into the aniline solution to promote polymerization reaction to produce conductive polyaniline. After the reaction was completed, saturated salt water was slowly added to cause precipitation reaction of the polyaniline in the solution. The product was filtered, washed and dried to obtain a polyaniline product. Recrystallization: the polyaniline product is placed in a phenol solvent and heated to 80-100°C, the polyaniline product is dissolved in the phenol solvent, and then cooled to 0-10°C to allow the polyaniline product to crystallize again, and then filtered, washed and dried to obtain pure polyaniline; The pure polyaniline is crushed by a pulverizer and passed through a 100-140 mesh sieve to obtain polyaniline powder. This fine particle is suitable for applications that require higher surface area and better conductive properties; Polyaniline is selected as the conductive polymer. Polyaniline has good conductive properties. At the same time, the conductive properties of polyaniline can be regulated through redox reactions. When an oxidant is introduced, the polyaniline molecules lose electrons to form cations, and polyaniline becomes conductive. When a reducing agent is introduced, the polyaniline molecules gain electrons to form neutral or negative ions, and the conductivity of polyaniline decreases, making it adapt to the requirements of different application scenarios and achieving adjustable conductivity. Example

[0027] See also Figure 1 , Figure 2 , an embodiment provided by the present invention: a composite fabric with heating function and a preparation method thereof, the preparation method of the carbon fiber in S2 is as follows: The polypropylene fiber is exposed to a high temperature environment for stabilization treatment. The temperature is set between 200℃ and 300℃. The purpose is to remove organic matter and make the fiber more graphitized, preparing for the subsequent high-temperature carbonization treatment. In this temperature range, the organic matter will decompose and volatilize, causing the fiber to gradually transform into a graphite structure. The graphitized polypropylene fiber is heated to 800-3000° C. in a nitrogen inert gas for 5-40 hours to obtain carbon fiber. Example

[0028] See also Figure 1 , Figure 2 , an embodiment provided by the present invention: a composite fabric with heating function and a preparation method thereof, the preparation method of the conductive fiber layer in S2 is as follows: Add polyaniline particles and carbon fibers into a mixer, add a dissolving solvent and a free radical initiator, stir and mix at a speed of 200-500 r / min for 1-3 hours to obtain a mixture, and dry the mixture at a drying temperature of 80-120° C. for 4-12 hours; The dissolving solvent is 15%-30% of dimethylformamide, the free radical initiator is 0.5%-2% of benzoyl peroxide, and the polyaniline particles, carbon fibers, the dissolving solvent and the free radical initiator are mixed in a weight ratio of 1:3:0.6-1.2:0.02-0.08; 15%-30% dimethylformamide has good solubility for polyaniline particles, which helps them to disperse in the mixture, and 0.5%-2% benzoyl peroxide can promote the cross-linking reaction between polyaniline particles and carbon fibers, thereby enhancing the bonding between them; The dried mixture is formed into conductive fibers by a spinning technique, and the conductive fibers are woven into a conductive fiber layer; The conductive fiber layer is cured by thermal curing. The conductive fiber layer is placed in an oven with the temperature set at 180-200°C and the time controlled at 40-60 minutes. Thermal curing makes the conductive fiber more orderly and stable at the molecular level, thereby improving its conductivity, mechanical strength and durability. Example

[0029] See also Figure 1 , Figure 2 An embodiment of the present invention provides: a composite fabric with heating function and a preparation method thereof, wherein in S3, polyimide powder or particles are added to a dimethyl sulfoxide solvent to dissolve to form a coating solution, and the concentration of polyimide in the coating solution is 10%. The conductive fiber layer is passed through a wetting device, and the coating solution is infiltrated onto the conductive fiber layer through the wetting device, so that the conductive fiber layer fully absorbs the coating solution, and a heating layer is obtained after cooling. Example

[0030] See also Figure 1 , Figure 2 , an embodiment provided by the present invention: a composite fabric with heating function and a preparation method thereof, the preparation process of hot-melt polyurethane thermoplastic adhesive in S4: The polyurethane prepolymer, plasticizer and additive are heated in a mixer and fully stirred to form a mixture, wherein the polyurethane prepolymer content in the mixture is 75%-94%, the plasticizer content is 5%-20%, and the additive content is 1%-5%. The mixture is heated to 180-200°C for 30-120 minutes to promote the polymerization reaction of the polyurethane prepolymer to generate a hot-melt polyurethane thermoplastic adhesive; Polyurethane prepolymer is formed by the reaction of isocyanate and polyol, the plasticizer is dibutyl diformate or polyether polyol, and the additive is a curing agent composed of isocyanate and polyate. The polyurethane prepolymer itself has good elasticity and flexibility, which enables the composite material to adapt to certain deformation and stress during use, thereby improving its durability and fatigue resistance. Example

[0031] See also Figure 1 , Figure 2 , an embodiment provided by the present invention: a composite fabric with heating function and a preparation method thereof, hot pressing process in S4: First, the cotton fabric is laid on the workbench, and the hot-melt adhesive coating machine is used to evenly apply the hot-melt polyurethane thermoplastic adhesive on one side of the cotton fabric to form a first adhesive layer, and the heating layer is laid on the surface of the adhesive layer. The hot-melt adhesive coating machine is used again to evenly apply the hot-melt adhesive on the surface of the heating layer to form a second adhesive layer, and another cotton fabric is laid on the surface of the second adhesive layer to obtain a prefabricated fabric; The prefabricated fabric is compounded by a hot pressing device, the hot pressing temperature is set to 150-200°C, the hot pressing pressure is set to 0.5-2MPa, and the hot pressing time is set to 5-30min to obtain a composite fabric; Hot-melt polyurethane thermoplastic adhesive can form a strong bond during the hot pressing process, ensuring a strong bond between the cotton fabric and the conductive fiber layer. This bonding performance helps to improve the overall strength and durability of the composite material. At the same time, polyurethane thermoplastic adhesive has a lower density, which helps with lightweight design.

[0032] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention may be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and range of equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered to limit the claim to which it relates.

Claims

1. A method for preparing a composite fabric with heating function, characterized in that: The preparation of the composite fabric includes the following steps: S1, using aniline as a raw material to produce polyaniline through a polymerization reaction, and pretreating the polyaniline to obtain pure polyaniline powder; S2, obtaining carbon fiber by high temperature treatment of polypropylene fiber, mixing, drying, spinning and curing the carbon fiber with polyaniline powder to obtain a conductive fiber layer; S3, adding polyimide powder into dimethyl sulfoxide solvent to dissolve to form a coating solution, applying it on the conductive fiber layer through a wetting device, and obtaining a heating layer after cooling; S4. Through a hot pressing process, the heating layer and the cotton fabric are compounded into a finished heating fabric using hot-melt polyurethane thermoplastic adhesive.

2. The method for preparing a composite fabric with heating function according to claim 1, characterized in that: The preparation method of the pure polyaniline powder in S1 is as follows: Aniline with a concentration of 5 mol / L was selected, and the aniline was dissolved in a hydrochloric acid solvent with a hydrochloric acid concentration of 1 mol / L. The solution was heated to 25°C and the reaction time was 24 hours. Oxygen was introduced into the aniline solution to promote polymerization reaction to produce conductive polyaniline. After the reaction was completed, saturated salt water was slowly added to cause precipitation reaction of the polyaniline in the solution. The product was filtered, washed and dried to obtain a polyaniline product. Recrystallization: the polyaniline product is placed in a phenol solvent and heated to 80-100°C, the polyaniline product is dissolved in the phenol solvent, and then cooled to 0-10°C to allow the polyaniline product to crystallize again, and then filtered, washed and dried to obtain pure polyaniline; Pure polyaniline is crushed by a pulverizer and passed through a 100-140 mesh sieve to obtain polyaniline powder. Through redox reactions, electrons can be introduced or removed from the polyaniline molecules, thereby adjusting their conductivity.

3. The method for preparing a composite fabric with heating function according to claim 1, characterized in that: The preparation method of the carbon fiber in S2 is as follows: Expose the polypropylene fiber to a high temperature environment for stabilization treatment. The temperature is set between 200℃ and 300℃ to promote the graphitization of the fiber. The organic matter will decompose and volatilize, causing the fiber to gradually transform into a graphite structure. The graphitized polypropylene fiber is heated to 800-3000° C. in a nitrogen inert gas for 5-40 hours to obtain carbon fiber.

4. The method for preparing a composite fabric with heating function according to claim 3, characterized in that: The preparation method of the conductive fiber layer in S2 is as follows: Add polyaniline particles and carbon fibers into a mixer, add a dissolving solvent and a free radical initiator, stir and mix at a speed of 200-500 r / min for 1-3 hours to obtain a mixture, and dry the mixture at a drying temperature of 80-120° C. for 4-12 hours; The dried mixture is formed into conductive fibers by a spinning technique, and the conductive fibers are woven into a conductive fiber layer; The conductive fiber layer is cured by a thermal curing method. The conductive fiber layer is placed in an oven with the temperature set at 180-200° C. and the time controlled at 40-60 minutes.

5. The method for preparing a composite fabric with heating function according to claim 4, characterized in that: The dissolving solvent in S2 is 15%-30% of dimethylformamide, the free radical initiator is 0.5%-2% of benzoyl peroxide, and the polyaniline particles, carbon fibers, the dissolving solvent and the free radical initiator are mixed in a weight ratio of 1:3:0.6-1.2:0.02-0.

08.

6. The method for preparing a composite fabric with heating function according to claim 1, characterized in that: The concentration of polyimide in the coating solution in S3 is 10%.

7. The method for preparing a composite fabric with heating function according to claim 6, characterized in that: The wetting device in S3 infiltrates the coating solution onto the conductive fiber layer through the wetting device, so that the conductive fiber layer fully absorbs the coating solution, and obtains the heating layer after cooling.

8. The method for preparing a composite fabric with heating function according to claim 1, characterized in that: The preparation process of the hot melt polyurethane thermoplastic adhesive in S4 is as follows: The polyurethane prepolymer, plasticizer and additive are heated in a mixer and fully stirred to form a mixture, wherein the polyurethane prepolymer content in the mixture is 75%-94%, the plasticizer content is 5%-20%, and the additive content is 1%-5%, and the mixture is heated to 180-200° C. for 30-120 minutes to promote the polymerization reaction of the polyurethane prepolymer to generate a hot-melt polyurethane thermoplastic adhesive; The polyurethane prepolymer is formed by the reaction of isocyanate and polyol, the plasticizer is dibutyl diformate or polyether polyol, and the auxiliary agent is a curing agent composed of isocyanate and polyate.

9. The method for preparing a composite fabric with heating function according to claim 8, characterized in that: The hot pressing process in S4 is as follows: First, the cotton fabric is laid on the workbench, and the hot-melt adhesive coating machine is used to evenly apply the hot-melt polyurethane thermoplastic adhesive on one side of the cotton fabric to form a first adhesive layer, and the heating layer is laid on the surface of the adhesive layer. The hot-melt adhesive coating machine is used again to evenly apply the hot-melt adhesive on the surface of the heating layer to form a second adhesive layer, and another cotton fabric is laid on the surface of the second adhesive layer to obtain a prefabricated fabric; The prefabricated fabric is compounded by a hot pressing device, the hot pressing temperature is set to 150-200°C, the hot pressing pressure is set to 0.5-2MPa, and the hot pressing time is set to 5-30min to obtain a composite fabric.

10. A composite fabric with heating function, applicable to the method for preparing a composite fabric with heating function according to any one of claims 1 to 9, characterized in that: It comprises a heating layer, both sides of which are coated with hot-melt polyurethane thermoplastic adhesive, a cotton fabric is pasted on the side of the hot-melt polyurethane thermoplastic adhesive away from the heating layer, the heating layer is obtained by soaking a conductive fiber layer in a coating solution, the conductive fiber layer is formed by mixing polyaniline powder and carbon fiber, and the coating solution is formed by mixing polyimide powder and dimethyl sulfoxide solvent.

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