A flexible multi-layer winding type heating wire and its preparation method

Abstract

The present invention relates to the technical field of heating wires, and particularly to a flexible multi-layer wrapped heating wire and a preparation method thereof, including a central fiber, a metal wire, and a wrapping fiber. The metal wire is spirally wrapped outside the central fiber to form a metal wire layer, and the wrapping fiber is spirally wrapped outside the metal wire layer to form a wrapping fiber layer. There are gaps between the wrapping fibers forming the wrapping fiber layer. The flexible multi-layer wrapped heating wire proposed by the present invention, by spirally wrapping the wrapping fiber outside the metal wire layer to form a wrapping fiber layer, the wrapping fiber can tightly fix the metal wire on the central fiber, and the wrapping fiber itself has flexibility. After the heating wire is bent, stretched, or squeezed multiple times, the distance between the central fiber, the metal wire, and the wrapping fiber is not easily changed, the metal wire is not easily broken, the heating wire can be used normally, and the heating wire has good anti-bending and anti-tensile properties.

Description

Technical Field

[0001] The present invention relates to the technical field of heating wires, and particularly to a flexible multi-layer wrapped heating wire and a preparation method thereof. Background Art

[0002] With the development of society, the requirements of occupants for the comfort and safety of the interior of automobiles are getting higher and higher. Therefore, devices such as heating, seat belt reminder, massage, and ventilation are provided on automobile seats.

[0003] Applying hot stone physiotherapy to automobile seats enables the automobile seats to have a certain physiotherapy effect when heated, which is deeply loved by the majority of occupants. The heating module of an automobile seat with hot stone physiotherapy function generally includes a heating wire and stones. The stones are in close contact with the heating wire. The heating wire heats the stones, and the heated stones heat the occupants. However, during the use of the automobile seat, the stones will squeeze the heating wire, causing the heating wire to be repeatedly bent, stretched or squeezed. The traditional heating wire for automobile seats generally consists of a central fiber, a metal wire and a plastic cortex. The metal wire is spirally wrapped outside the central fiber to form a metal wire layer, and the cortex is sleeved outside the metal wire layer. After repeated bending, stretching or squeezing, the gap between the cortex and the metal wire is obvious, and the cortex cannot protect the metal wire well, resulting in the metal wire being prone to breakage, making the heating effect fail and affecting the use of the occupants. Summary of the Invention

[0004] The purpose of the present invention is to solve the deficiencies existing in the prior art, and to provide a flexible multi-layer wrapped heating wire and a preparation method thereof.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A flexible multi-layer wrapped heating wire includes a central fiber, a metal wire and a wrapping fiber. The metal wire is spirally wrapped outside the central fiber to form a metal wire layer. The wrapping fiber is spirally wrapped outside the metal wire layer to form a wrapping fiber layer. There are gaps between the wrapping fibers forming the wrapping fiber layer.

[0007] It further includes a wrapping tape. The wrapping tape is spirally wrapped outside the fiber layer to form a wrapping tape layer. The edges of the wrapping tapes in the wrapping tape layer are mutually adhered to form an overlapping part.

[0008] Preferably, the wrapping fiber is single or multiple. When the wrapping fiber is multiple, non-twisted wrapping or twisted wrapping can be adopted, and parallel side-by-side structures can be adopted for simultaneous wrapping.

[0009] Preferably, the wrapping direction of the metal wire and the wrapping fiber is the same or opposite, and the wrapping direction of the wrapping fiber and the wrapping tape is the same or opposite.

[0010] Preferably, the material of the wrapped fiber is one of aramid, polyarylate, polyester, nylon, and polyimide, and the wire diameter of the wrapped fiber is 5 - 400 μm.

[0011] Preferably, the material of the wrapping tape is one of perfluoroethylenepropylene, polytetrafluoroethylene, polyvinylidene fluoride, polyester resin, and polyphenylene sulfide, and the thickness of the wrapping tape is 5 - 100 μm.

[0012] Preferably, an insulating paint film is coated on the outer side of the metal wire.

[0013] Preferably, a carbon paste coating layer is provided on the wrapped fiber, and the carbon paste coating layer is made of the following raw materials in parts by weight: 20 - 25 parts of thermosetting acrylic resin, 8 - 12 parts of nano carbon black, 3 - 5 parts of silane coupling agent, 5 - 8 parts of nano silicon dioxide, 0.5 - 1.5 parts of defoaming agent, and 15 - 25 parts of solvent;

[0014] The particle size of the nano carbon black is 20 - 60 nm;

[0015] The particle size of the nano silicon dioxide is 15 - 25 nm;

[0016] The solvent is one of benzene, xylene, methanol, ethanol, butanol, acetone, methyl ethyl ketone, and butanone.

[0017] Preferably, the preparation method of the wrapped fiber includes the following steps:

[0018] Step 1: Add the thermosetting acrylic resin, nano carbon black, silane coupling agent, nano silicon dioxide, defoaming agent, and solvent in parts by mass to a stirring device, and stir evenly to obtain a dipping solution;

[0019] Step 2: Add the dipping solution to an impregnation tank, and then continuously pass the wrapped fiber through the impregnation tank for impregnation treatment. After the impregnation treatment is completed, perform curing treatment through a heating furnace to obtain a wrapped fiber coated with a carbon paste coating layer;

[0020] The residence time of the wrapped fiber in the dipping solution is 2 - 10 s, and the curing temperature is 140 - 160 °C.

[0021] Preferably, a preparation method of a flexible multi-layer wrapped heating wire includes the following steps:

[0022] First, helically wrap the metal wire around the outside of the central fiber to obtain a metal wire layer, then helically wrap the wrapped fiber around the outside of the metal wire layer to obtain a wrapped fiber layer; finally, helically wrap the wrapping tape around the outside of the wrapped fiber layer to obtain a wrapping tape layer.

[0023] Preferably, when the metal wire is helically wrapped around the outside of the central fiber, the central fiber is first straightened and tensioned, and then the metal wire is wound around the outside of the central fiber, or the metal wire and the central fiber are stranded with a single pitch through a stranding machine.

[0024] The beneficial effects of the present invention are as follows:

[0025] 1. For the flexible multi-layer wrapped heating wire proposed by the present invention, the wrapping fiber is helically wrapped around the outside of the metal wire layer to form a wrapping fiber layer. The wrapping fiber can firmly fix the metal wire on the central fiber, and the wrapping fiber itself is flexible. After the heating wire is bent, stretched or squeezed multiple times, the distance between the central fiber, the metal wire and the wrapping fiber is not easily changed, and the metal wire is not easily broken due to the protection of the wrapping fiber, so that the heating wire can be used normally, and the heating wire has good anti-bending and anti-tensile properties. Multiple twisted wrapping fibers, due to the existence of certain gaps between the parallel and co-wound wrapping fibers and the gaps between the fibers, compared with the outer skins coated with Teflon and nylon, contribute to the improvement of the bending performance and the acceleration of heat diffusion.

[0026] 2. For the flexible multi-layer wrapped heating wire proposed by the present invention, a wrapping tape is wrapped outside the wrapping fiber layer, and the wrapping tape can improve the sealing performance of the heating wire and further extend the service life of the heating wire.

[0027] For the flexible multi-layer wrapped heating wire proposed by the present invention, the thicknesses of the wrapping fiber layer and the wrapping tape layer are much smaller than the thickness of the cortical layer of the traditional automotive seat heating wire, and there are gaps between the fibers. Compared with the outer skins coated with Teflon and nylon, the heat conduction effect is better, and the stone can be quickly heated to the preset temperature, so that the occupants can use it comfortably and the physiotherapy effect is good.

[0028] 3. For the flexible multi-layer wrapped heating wire proposed by the present invention, a carbon paste coating layer is provided on the wrapping fiber. The carbon black particles in adjacent wrapping fibers are in relative contact to form a heat island, which can accelerate the transfer of heat on the metal wire to the outside. Nano-silica can improve the strength of the carbon paste coating layer to a certain extent and ensure the reliable strength of the wrapping fiber.

[0029] 4. For the flexible multi-layer wrapped heating wire proposed by the present invention, a carbon paste coating layer is provided on the wrapping fiber. Under the action of an electric field, the carbon black particles in the carbon paste coating layer generate heat, and the carbon molecular clusters in the carbon black particles generate "Brownian motion", and the carbon molecules rub and collide violently with each other. The generated heat energy is transferred to the outside in the form of far-infrared radiation and convection, so that the heating wire has a far-infrared function, and the carbon paste forms a health care function of infrared radiation.

[0030] 5. When the metal wire is helically wrapped around the outside of the central fiber, the central fiber is first straightened and tensioned, and then the metal wire is wound around the outside of the central fiber. During the processing, the metal wire is not subjected to torsional stress, and the bending resistance of the heating wire is better. When using a single-twist machine to twist the metal wire and the central fiber by a single pitch, the processing is more convenient, but the metal wire is subjected to a small amount of torsional stress during the twisting process, and the bending resistance performance decreases slightly. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 FIG. is a schematic cross-sectional structure of a flexible multi-layer wrapped heating wire proposed by the present invention Figure 1 ;

[0032] Figure 2 FIG. is a schematic cross-sectional structure of a flexible multi-layer wrapped heating wire proposed by the present invention Figure 2 ;

[0033] Figure 3 FIG. is a schematic cross-sectional structure of a flexible multi-layer wrapped heating wire proposed by the present invention Figure 3 ;

[0034] Figure 4 FIG. is a schematic cross-sectional structure of a flexible multi-layer wrapped heating wire proposed by the present invention Figure 4 .

[0035] In the figure: 1 central fiber, 2 metal wire, 3 wrapping fiber, 4 wrapping tape. DETAILED DESCRIPTION OF THE INVENTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0037] Referring to Figures 1-4 , a flexible multi-layer wrapped heating wire includes a central fiber 1, a metal wire 2, and a wrapping fiber 3. The metal wire 2 is helically wrapped around the outside of the central fiber 1 to form a metal wire layer, and the wrapping fiber 3 is helically wrapped around the outside of the metal wire layer to form a wrapping fiber layer. There are gaps between the wrapping fibers 3 that form the wrapping fiber layer. Adjacent wrapping fibers 3 are in close contact with each other, but it is impossible to achieve complete sealing between the wrapping fibers 3, so there are tiny gaps between the wrapping fibers 3;

[0038] It further includes a wrapping tape 4. The wrapping tape 4 is helically wrapped around the outside of the fiber layer to form a wrapping tape layer. The edges of the wrapping tapes 4 in the wrapping tape layer are in contact with each other to form an overlapping part, as Figure 4 shown.

[0039] In the actual use process, the flexible multi-layer wrapped heating wire can not adopt the structure of the wrapping tape 4 layer to improve its heat conduction effect.

[0040] The wrapping fiber 3 is single or multiple. When the wrapping fiber 3 is multiple, non-twisted wrapping or twisted wrapping can be adopted, and parallel side-by-side structure can be adopted for simultaneous wrapping.

[0041] Figure 1 In, the wrapping fiber 3 is single; Figure 2 In, the wrapping fiber 3 is multiple and is independently wrapped; Figure 3 In, the wrapping fiber 3 is multiple and is wrapped as a twisted thread.

[0042] The wrapping direction of the wire 2 is the same as or opposite to that of the wrapping fiber 3, and the wrapping direction of the wrapping fiber 3 is the same as or opposite to that of the wrapping tape 4.

[0043] The material of the wrapping fiber 3 is one of aramid, polyarylate, polyester, nylon and polyimide, and the wire diameter of the wrapping fiber 3 is 5 - 400 μm.

[0044] The material of the wrapping tape 4 is one of perfluoroethylenepropylene, polytetrafluoroethylene, polyvinylidene fluoride, polyester resin and polyphenylene sulfide, and the thickness of the wrapping tape 4 is 5 - 100 μm.

[0045] When the wrapping fiber adopts aramid, polyarylate or polyimide, it can work at a temperature above 150 °C for a long time, and the wrapping fiber does not contain fluorine element, so the environmental protection performance of the wrapping fiber is better; when the working temperature requirement of the heating wire is relatively low, materials such as polyester and nylon can be used.

[0046] The outer side of the wire 2 is coated with an insulating paint film.

[0047] A carbon paste coating layer is provided on the wrapping fiber 3, and the carbon paste coating layer is made of the following raw materials in parts by weight: 20 - 25 parts of thermosetting acrylic resin, 8 - 12 parts of nano carbon black, 3 - 5 parts of silane coupling agent, 5 - 8 parts of nano silicon dioxide, 0.5 - 1.5 parts of defoaming agent and 15 - 25 parts of solvent;

[0048] The particle size of the nano carbon black is 20 - 60 nm;

[0049] The particle size of the nano silicon dioxide is 15 - 25 nm;

[0050] The solvent is one of benzene, xylene, methanol, ethanol, butanol, acetone, methyl ethyl ketone and butanone.

[0051] The preparation method of the wrapping fiber 3 includes the following steps:

[0052] Step 1: Add the thermosetting acrylic resin, nano carbon black, silane coupling agent, nano silicon dioxide, defoaming agent and solvent into a stirring device according to parts by mass, and stir evenly to obtain a dipping solution;

[0053] Step 2: Add the dip coating solution into the dipping tank, and then continuously pass the wrapped fiber 3 through the dipping tank for dipping treatment. After the dipping treatment is completed, carry out curing treatment through a heating furnace to obtain the wrapped fiber 3 coated with a carbon paste coating layer;

[0054] The residence time of the wrapped fiber 3 in the dip coating solution is 2 - 10 s, and the curing temperature is 140 - 160 °C.

[0055] Preparation method 1 of the wrapped fiber 3:

[0056] Step 1: Add 20 parts of thermosetting acrylic resin, 8 parts of nano carbon black, 3 parts of silane coupling agent, 5 parts of nano silicon dioxide, 0.5 part of defoaming agent, and 15 parts of xylene into a stirring device, and stir evenly to obtain the dip coating solution;

[0057] Step 2: Add the dip coating solution into the dipping tank, and then continuously pass the wrapped fiber 3 through the dipping tank for dipping treatment. After the dipping treatment is completed, carry out curing treatment through a heating furnace to obtain the wrapped fiber 3 coated with a carbon paste coating layer;

[0058] The residence time of the wrapped fiber 3 in the dip coating solution is 2 s, and the curing temperature is 140 °C.

[0059] Preparation method 2 of the wrapped fiber 3:

[0060] Step 1: Add 25 parts of thermosetting acrylic resin, 12 parts of nano carbon black, 5 parts of silane coupling agent, 8 parts of nano silicon dioxide, 1.5 parts of defoaming agent, and 25 parts of ethanol into a stirring device, and stir evenly to obtain the dip coating solution;

[0061] Step 2: Add the dip coating solution into the dipping tank, and then continuously pass the wrapped fiber 3 through the dipping tank for dipping treatment. After the dipping treatment is completed, carry out curing treatment through a heating furnace to obtain the wrapped fiber 3 coated with a carbon paste coating layer;

[0062] The residence time of the wrapped fiber 3 in the dip coating solution is 2 - 10 s, and the curing temperature is 140 - 160 °C.

[0063] Preparation method 3 of the wrapped fiber 3:

[0064] Step 1: Add 22 parts of thermosetting acrylic resin, 6 parts of nano carbon black, 4 parts of silane coupling agent, 6 parts of nano silicon dioxide, 1 part of defoaming agent, and 22 parts of acetone into a stirring device, and stir evenly to obtain the dip coating solution;

[0065] Step 2: Add the dip coating solution into the dipping tank, and then continuously pass the wrapped fiber 3 through the dipping tank for dipping treatment. After the dipping treatment is completed, carry out curing treatment through a heating furnace to obtain the wrapped fiber 3 coated with a carbon paste coating layer;

[0066] The residence time of the wrapped fiber 3 in the dipping solution is 2 to 10 s, and the curing temperature is 140 to 160 °C.

[0067] A preparation method of a flexible multi-layer wrapped heating wire includes the following steps:

[0068] First, helically wrap the metal wire 2 outside the central fiber 1 to obtain a metal wire layer, then helically wrap the wrapped fiber 3 outside the metal wire layer to obtain a wrapped fiber layer; finally, helically wrap the wrapping tape 4 outside the wrapped fiber layer to obtain a wrapping tape layer.

[0069] When helically wrapping the metal wire 2 outside the central fiber 1, first straighten and tension the central fiber 1, and then wind the metal wire 2 outside the central fiber 1, or straighten and tension and twist the metal wire 2 and the central fiber 1 through a stranding machine.

[0070] When helically wrapping the metal wire 2 outside the central fiber 1, when first straightening and tensioning the central fiber 1 and then winding the metal wire 2 outside the central fiber, during the processing, the metal wire 2 is not subjected to torsional stress, and the bending resistance performance of the heating wire is better; when using a stranding machine to twist the metal wire 2 and the central fiber 1 by a single pitch, the processing is more convenient, but the metal wire 2 is subjected to a small amount of torsional stress during the stranding process, and the bending resistance performance decreases slightly.

[0071] For the flexible multi-layer wrapped heating wire proposed by the present invention, by helically wrapping the wrapped fiber 3 outside the metal wire layer to form a wrapped fiber layer, the wrapped fiber 3 can firmly fix the metal wire 2 on the central fiber 1, and the wrapped fiber 3 itself has flexibility. After the heating wire is bent or stretched multiple times, the distance between the central fiber 1, the metal wire 2, and the wrapped fiber 3 is not easy to change. The metal wire 2 is not easy to break due to the protection of the wrapped fiber 3, and the heating wire can be used normally, and the heating wire has good bending resistance and tensile properties.

[0072] For the flexible multi-layer wrapped heating wire proposed by the present invention, a wrapping tape 4 is wrapped outside the wrapped fiber layer. Through the wrapping tape 4, the sealing performance of the heating wire can be improved, and the service life of the heating wire can be further extended.

[0073] For the flexible multi-layer wrapped heating wire proposed by the present invention, the thicknesses of the wrapped fiber layer and the wrapping tape layer are much smaller than the thickness of the cortical layer of the traditional automotive seat heating wire, and there are gaps between the fibers. Compared with the outer skins coated with Teflon and nylon, the heat conduction effect is better, and the stone can be quickly heated to the preset temperature, and the occupant feels comfortable and the physiotherapy effect is good.

[0074] For the flexible multi-layer wrapped heating wire proposed by the present invention, a carbon paste coating layer is provided on the wrapped fiber 3. The carbon black particles in adjacent wrapped fibers 3 are in relative contact to form a heat island, which can accelerate the transfer of heat on the metal wire 2 to the outside. Nano-silica can, to a certain extent, improve the strength of the carbon paste coating layer and ensure the reliable strength of the wrapped fiber 3.

[0075] For the flexible multi-layer wrapped heating wire proposed by the present invention, a carbon paste coating layer is provided on the wrapped fiber 3. Under the action of an electric field, the carbon black particles in the carbon paste coating layer generate heat. The carbon molecular clusters in the carbon black particles produce "Brownian motion", and intense friction and collision occur between the carbon molecules. The generated heat energy is transferred to the outside in the form of far-infrared radiation and convection, enabling the heating wire to have a far-infrared function, and the carbon paste forms a health care function of infrared radiation.

[0076] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A flexible multi-layer wrapped heating wire, comprising a core fiber (1), a metal wire (2) and a wrapped fiber (3), wherein the metal wire (2) is spirally wrapped around the outside of the core fiber (1) to form a metal wire layer, characterized in that: The wrapping fibers (3) are spirally wrapped around the outer side of the metal wire layer to form a wrapping fiber layer, and gaps exist between the wrapping fibers (3) forming the wrapping fiber layer; It also includes a wrapping tape (4), wherein the wrapping tape (4) is spirally wrapped around the outer side of the fiber layer to form a wrapping tape layer, and the edges of the wrapping tape (4) in the wrapping tape layer are attached to each other to form an overlapping portion; The wrapped fiber (3) is a single fiber or multiple fibers. When the wrapped fiber (3) is multiple fibers, non-twisting wrapping or twisting wrapping can be adopted, and the wrapping can be done in parallel and side by side. The metal wire (2) and the wrapping fiber (3) are wrapped in the same or opposite directions, and the wrapping fiber (3) and the wrapping tape (4) are wrapped in the same or opposite directions; The material of the wrapping fiber (3) is one of aramid, polyarylate, polyester, nylon and polyimide, and the wire diameter of the wrapping fiber (3) is 5-400 μm; A carbon slurry coating layer is arranged on the wrapped fiber (3), and the carbon slurry coating layer is made of the following raw materials in parts by weight: 20-25 parts of thermosetting acrylic resin, 8-12 parts of nano carbon black, 3-5 parts of silane coupling agent, 5-8 parts of nano silicon dioxide, 0.5-1.5 parts of defoaming agent and 15-25 parts of solvent; The particle size of the nano carbon black is 20 to 60 nm; The particle size of the nano silicon dioxide is 15 to 25 nm; The solvent is one of benzene, xylene, methanol, ethanol, butanol, acetone, methyl ethyl ketone and butanone.

2. A flexible multi-layer wrapped heating wire according to claim 1, characterized in that: The material of the wrapping tape (4) is one of polyperfluoroethylene propylene, polytetrafluoroethylene, polyvinylidene fluoride, polyester resin, and polyphenylene sulfide, and the thickness of the wrapping tape (4) is 5-100 μm.

3. The flexible multi-layer wrapped heating wire according to claim 1, characterized in that: The outer side of the metal wire (2) is coated with an insulating paint film.

4. The flexible multi-layer wrapped heating wire according to claim 1, characterized in that: The method for preparing the wrapped fiber (3) comprises the following steps: Step 1, adding thermosetting acrylic resin, nano carbon black, silane coupling agent, nano silicon dioxide, defoaming agent and solvent into a stirring device according to parts by mass, stirring evenly to obtain a dipping solution; Step 2, adding the dipping liquid into the dipping tank, and then continuously passing the wrapped fiber (3) through the dipping tank for dipping treatment, and after the dipping treatment is completed, performing a curing treatment in a heating furnace to obtain the wrapped fiber (3) coated with a carbon slurry coating layer; The residence time of the wrapped fiber (3) in the dipping solution is 2 to 10 seconds, and the curing temperature is 140 to 160°C.

5. A method for preparing a flexible multi-layer wrapped heating wire according to any one of claims 1 to 4, characterized in that: The following steps are involved: First, a metal wire (2) is spirally wrapped around the outside of a central fiber (1) to obtain a metal wire layer, and then a wrapping fiber (3) is spirally wrapped around the outside of the metal wire layer to obtain a wrapping fiber layer; finally, a wrapping tape (4) is spirally wrapped around the outside of the wrapping fiber layer to obtain a wrapping tape layer.

6. The method for preparing a flexible multi-layer wrapped heating wire according to claim 5, characterized in that: When the metal wire (2) is spirally wrapped around the outside of the central fiber (1), the central fiber (1) is firstly paralleled, and then the metal wire (2) is wound around the outside of the central fiber (1), or the metal wire (2) and the central fiber (1) are twisted with a single twisting machine.

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