A vertical steering wheel strip automatic magnetic free stretching data line and a preparation method and application thereof

Abstract

The application discloses a data line with a vertical steering wheel strip-shaped automatic magnetic free stretching data line and a preparation method and application, the data line comprises a flexible coating on a core, a flexible permanent magnetic coating layer in the middle and a flexible outer coating layer from inside to outside in sequence, and the preparation method comprises the following steps: step A, extrusion molding; step B, first, pre-magnetization is performed to form a vertical steering wheel strip-shaped shape, then, a 180-degree constant magnetic field in the north-south direction is used for orientation, and finally, magnetization is performed. The application aims to solve the phenomenon that the automatic winding and magnetic attraction of the prior art data line are not completed, so that the magnetic crystal anisotropy field of samarium iron nitrogen which is much higher than other permanent magnetic materials can be better used, the data line has better advantages such as temperature resistance, corrosion resistance and demagnetization resistance, and the requirement of the data line attraction force can be met by thickening the magnetic layer.

Description

Technical Field

[0001] This invention belongs to the field of magnetic materials, and particularly relates to a vertically oriented, disc-shaped, automatically magnetically attracted, freely stretchable data cable, its preparation method, and its application. Background Technology

[0002] Application number US10886587, electromagnetic insulated wire and manufacturing method and equipment thereof, the electromagnetic insulated wire can effectively reduce electromagnetic noise induced in conductor and has high flexibility. The application of magnetic materials in the data line in this technical solution utilizes its soft magnetic permeability to meet EMC requirements.

[0003] US Patent Application No. 14105515 discloses a transmission cable with magnetic attraction, comprising: a tubular outer insulating sheath made of an electrically insulating material, wherein a magnetic substance is embedded in the insulating material; conductors, each conductor having an insulator axially inserted into the tubular outer insulating sheath; and a metal core surrounded by the insulator. Therefore, the transmission cable can be repeatedly folded back and forth to form a bundle, such that the bent sections of the tubular outer insulating sheath can be fixed to each other or to a magnetically attractive wall by magnetic attraction. This technology discloses the technical effect of magnetic attraction through folding back and forth, but does not disclose technical means sufficient to support this effect.

[0004] Announcement No. CN113674921B discloses a method for preparing a magnetically attracted, automatically coiled, and freely stretchable data cable. This method concentrates the magnetic force on the end faces of adjacent data cables in the vertical direction, allowing the data cables to maintain a coiled magnetic state and free stretchability. This provides a successful industrial application case for samarium iron nitrogen magnetic powder. The application of magnetic materials in this data cable utilizes permanent magnets to meet the requirement of sufficient magnetic force in the vertical direction. This data cable has been well-received by consumers since its market launch. However, many data cables on the market fail to achieve proper automatic coiling and magnetic attraction. The relentless pursuit of manufacturers and developers of magnetic materials for data cable applications is to make the use of magnetic force more efficient and ingenious, ensure safe magnetization, avoid using excessive magnetic materials to meet magnetic requirements, optimize storage methods and dimensions, create a more attractive appearance, and improve the user experience.

[0005] See Table 6 of CN113674921B. The magnetocrystalline anisotropy field of samarium iron nitrogen is much higher than that of other permanent magnet materials, reaching 14T, which is about twice that of Nd-Fe-B compounds. Further efforts are needed to solve the problem of saturation magnetization of samarium iron nitrogen in wires and to make full use of its magnetic properties.

[0006] The following is a supplementary explanation of the concepts involved in the technical solution of this application:

[0007] Constant current electromagnetic magnetization: A constant current of direct current is passed through the coil to generate a constant magnetic field in the coil;

[0008] Pulse electromagnetic magnetization: A large pulse current is passed through the coil momentarily, causing the coil to generate a short-lived, extremely strong magnetic field;

[0009] Magnetizing permanent magnets: Magnetizing through a constant magnetic field generated by a permanent magnet;

[0010] Softening and melting temperature: The softening and melting temperature of the magnetic layer or outer coating is also the melting temperature of its matrix components;

[0011] One of the radial cross-sectional shapes of flat data cables is racetrack-shaped or square; the radial cross-section of round data cables is circular.

[0012] Single data cable: When adjacent data cables are vertically attached or during magnetization, it operates as a single cable, which is suitable for shorter data cables;

[0013] Foldable data cable: When folded in the middle, adjacent data cables are perpendicularly attracted or magnetized. The folded data cable is treated as a single data cable, which is suitable for longer data cables. Summary of the Invention

[0014] A method for manufacturing a vertically oriented, strip-shaped, automatically magnetically attracted, freely stretchable data cable, wherein the data cable comprises, from the inside out, a tightly connected flexible core, a middle flexible permanent magnet coating layer, and an outer flexible outer layer.

[0015] Its preparation method includes the following steps:

[0016] Step A, extrusion molding;

[0017] Step B involves first pre-magnetizing the disc to create a vertical, strip-shaped shape, then aligning it with a constant magnetic field at 180° north-south, and finally magnetizing it.

[0018] The flexible covering material in the core is an assembly of flexible single wires that perform various functions, such as power lines and data lines.

[0019] The data cable is first pre-magnetized and shaped into a vertical disc. After extrusion, it is either single or folded and wrapped around a cylinder inside the solenoid, or coiled into a vertical disc and placed inside the solenoid. The axial center line of the coiled data cable, the axial center line of the cylinder, and the axial center line of the solenoid are parallel or overlap. In the coiled state, the data cable completes pulse magnetization inside the solenoid, with a magnetic field strength of at least 2.0T or higher.

[0020] The cylinder inside the solenoid is mounted on the base of a device with adjustable lifting height and rotation speed. Both the upper and lower ends of the cylinder are longer than the axial length of the solenoid. As the cylinder rotates after extrusion, one end of the data cable enters the solenoid, and after being magnetized, it comes out from the other end of the solenoid.

[0021] The cylinder inside the solenoid is non-magnetic;

[0022] The pulse magnetization inside the solenoid is intermittent, but the preparation process is a continuous operation without interruption. After the extruded flexible data line enters the solenoid, the cumulative axial height of the coiled shape does not exceed 2 / 3 to 3 / 3 of the axial height of the solenoid. The magnetized coiled data line is located in the middle of the central axis of the solenoid.

[0023] The 180° constant magnetic field orientation in the north-south direction completes the pre-magnetization of the vertically oriented disk strip-shaped data line. It is then heated to the temperature at which the magnetic layer softens and melts. The data line is pulled from the disk strip shape into a single or folded data line and oriented and magnetized by a 180° permanent magnet magnetic field or a constant current electromagnetic field in the north-south direction. The magnetic field strength is at least 5000Gs or more. After cooling and shaping, it maintains the vertical magnetic disk strip shape.

[0024] The speed at which a single or folded data cable travels through a permanent magnet magnetic field or a constant current electromagnetic field is 10-120 m / min, and the magnetized area of ​​the constant magnetic field is 2×2 cm or 1×10 cm.

[0025] The normal direction of the flat data line parallel to the magnetic field direction is parallel to the direction of the parallel plane. The radial circular data line is passively magnetically attracted and dynamically twisted forward to maintain the orientation magnetization during the original pulse pre-magnetization direction.

[0026] The softening and melting temperature of the magnetic layer is 120-130℃;

[0027] The flexible outer coating has a softening and melting temperature that is at least 30°C higher than that of the intermediate flexible permanent magnet coating.

[0028] The softening point temperature of the outer flexible outer layer is 150°C to 260°C.

[0029] The outer flexible outer layer is at least one of a polymer layer, a woven layer, a leather layer, and a decorative layer;

[0030] The polymer layer is a blend comprising at least one of the following: polypropylene with a softening point of 160-180℃, polychlorotrifluoroethylene with a softening point of 200-220℃, polycarbonate with a softening point of 220-230℃, silicone rubber with a softening point of 200-250℃, polyphenylene sulfide modified polypropylene with a softening point of 180-220℃, polyethylene terephthalate with a softening point of 250-260℃, thermoplastic polyurethane (TPU) with a softening point of 150-180℃, and thermoplastic elastomer (TPE) with a softening point of 165-185℃, plasticizer, and additives.

[0031] The final magnetization involves the data line undergoing pulse magnetization within the solenoid or magnetization within a constant current field in its oriented, vertically coiled state. The data line is then pulled from its coiled shape into a single or folded form and passes through a permanent magnet magnetic field or a constant current electromagnetic field with a magnetic field strength of at least 2.0T or higher.

[0032] The flexible permanent magnet magnetic coating layer is a flexible modified polymer composite material layer with permanent magnet material powder as filler;

[0033] The permanent magnet material is at least one of anisotropic samarium iron nitrogen, isotropic or anisotropic ferrite, isotropic or anisotropic neodymium iron boron, cerium iron boron, and samarium cobalt;

[0034] The softening and melting temperature of the matrix component of the flexible modified polymer composite layer is 50°C to 150°C.

[0035] The matrix components of the flexible modified polymer composite layer include: oil-extended polyvinyl chloride with a softening point of 70-115℃, oil-extended chlorinated polyethylene with a softening point of 75-90℃, oil-extended ethylene propylene diene monomer (EPDM) with a softening point of 90-110℃, a polyolefin elastomer with a softening point of 50-120℃, and a density of 0.96 g / cm³ with a softening point of 100-120℃. 3 A blend of at least one of the following: polyethylene density, poly-1-butene at 125-135℃, polyvinylidene chloride at 115-140℃, thermoplastic vulcanizate (TPV) at 100-150℃, low-temperature thermoplastic elastomer (TPE) at 60-130℃, and thermoplastic polyurethane (TPU) at 110-130℃, plasticizer, and additives.

[0036] The matrix component of the flexible permanent magnet magnetic coating layer is a modified polymer made by blending thermoplastic elastomer (TPE) with plasticizers and additives, with a softening point of 120-130℃.

[0037] A vertical steering wheel-shaped automatic magnetic attraction and free stretching data cable includes one of the following axisymmetric regular shapes with a cross-sectional shape: circular, flat, or elliptical. The data cable is prepared by any of the above-mentioned methods for preparing a vertical steering wheel-shaped automatic magnetic attraction and free stretching data cable.

[0038] The application of a vertical steering wheel strip-shaped automatic magnetic attraction and free stretching data cable, wherein the data cable is prepared by the above-mentioned method for preparing a vertical steering wheel strip-shaped automatic magnetic attraction and free stretching data cable, and the data connector is one of a USB type-c data connector, a Lightning data connector, and an audio data connector.

[0039] The front and rear connectors of the data cable are located at the same end of the vertical coil, and the data cable is folded.

[0040] Beneficial effects

[0041] The magnetization method in this embodiment is universal for magnetizing flexible wires;

[0042] In Examples 1 to 6, the magnetization process involves first pulse shaping, then a constant magnetic field orientation in the north-south direction of 180°, followed by another pulse. This presents a novel magnetization method for samarium iron nitrogen permanent magnets with an anisotropic field of 14T, approximately twice that of Nd-Fe-B compounds. The magnetic field directions remain consistent across the three magnetization stages. The magnetization operation of the technical solution presented in this application is safe and reliable, environmentally friendly, and easy to implement and mass-produce.

[0043] The surface magnetism increases with the increase of the magnetic layer thickness. The magnetization method in this embodiment improves the full utilization of the magnetic properties of samarium iron nitrogen and avoids the method of enhancing the surface magnetism by relying solely on thickness.

[0044] The magnetization method of this application further solves the magnetization problem by using samarium iron nitrogen in the wire. Based on the material properties of samarium iron nitrogen itself, such as a high Curie temperature of 476℃ and high intrinsic coercivity, the data cable has its own advantages in corrosion resistance, processability and demagnetization resistance.

[0045] This technical solution can also be extended to various cables such as power cords, audio cables, video cables, and network cables, making it universal; the foldable data cable with automatic magnetic attraction of the coil keeps the interfaces of longer data cables on the same end, making it convenient to use.

[0046] The technical solution of this application will be further described below with reference to the accompanying drawings and specific embodiments. The technical solution and beneficial effects will become clearer. The enumeration of parameters related to magnetic field size and dimensions, as well as the illustrations, are not limitations on the technical solution of this application. Any addition, equivalent substitution, or recombination without inventiveness will fall within the protection scope of the technical solution of this application. Attached Figure Description

[0047] . Figure 1 The following are schematic diagrams of the appearance of a vertically oriented, disc-shaped, automatically magnetically attracted, freely stretchable data cable in embodiments 1 to 4 of this technical solution. The arrows in the diagrams indicate the magnetization direction of the parallel plane normal. The surface magnetism is strongest on the upper and lower surfaces in the direction of the arrows. The cross-section is racetrack-shaped, and the outer sheath is braided.

[0048] Figure 2 The technical solution embodiments 5 and 6, and comparative examples 1 and 2, are schematic diagrams of the appearance of a vertically oriented, disc-shaped, automatically magnetically attracted, freely stretchable data cable. The arrows in the figures indicate the magnetic attraction direction, and the magnetic force is strongest at the top and bottom of the arrow direction. The cross-section is square, and the outer layer is a polymer coating.

[0049] Figure 3 This technical solution is one of the schematic diagrams of the cross-section of a vertically oriented, disc-shaped, automatically magnetically attached, freely stretchable data cable in the width direction. In the diagram, 100 is the outer layer, 200 is the magnetic layer, and 300 is the flexible covering.

[0050] Given the flexibility of the core's coating, the varying number, arrangement, and diameter of the core wires, the magnetic layer thickness is not as uneven as shown in Table 200. The thickness recorded in Table 2 is an average value, and the magnetic measurement values ​​are a range, truly reflecting the final effect of the magnetic layer thickness.

[0051] Figure 4 This technical solution is one of the application appearance structure diagrams of a vertically oriented, disc-shaped, automatically magnetically attracted, freely stretchable data cable. The data cable is in a folded state, the data cable interface is USB type-c, and the connectors at both ends of the data cable are located on the same oriented end face of the disc shape.

[0052] Figure 5 The process flow diagram for manufacturing the vertical steering wheel strip data cable in this technical solution. Detailed Implementation

[0053] Reference Figure 1-3 A method for preparing a vertically oriented, disc-shaped, automatically magnetically attracted, freely stretchable data cable, wherein the data cable comprises, from the inside out, a tightly connected flexible core covering, a middle flexible permanent magnet covering layer, and an outer flexible outer layer.

[0054] Its preparation method refers to Figure 5 This technical solution presents a process flow diagram for manufacturing the vertical steering wheel strip data cable.

[0055] Extrusion molding: The flexible permanent magnet magnetic coating layer in the middle of the data cable is co-extruded with the flexible outer layer or extruded sequentially; or: the flexible permanent magnet magnetic coating layer in the middle of the data cable is extruded and then covered with a braided outer layer.

[0056] First, the data cable is shaped into a vertical spiral strip. After extrusion, it is wound around the cylinder inside the solenoid, or coiled into a vertical spiral strip and placed inside the solenoid. The axial center line of the coiled data cable, the axial center line of the cylinder, and the axial center line of the solenoid are parallel or overlap. In the coiled state, the data cable completes pulse magnetization inside the solenoid with a magnetic field strength of 2.5T, forming a vertical spiral strip.

[0057] Reorientation is performed by heating the resulting data line to the softening and melting temperature of the magnetic layer (120-130℃). The data line is then pulled apart from its coiled shape. Single or folded data lines are pre-magnetized in a 180° north-south permanent magnet magnetic field or a constant current electromagnetic field with a magnetic field strength of 8000 Gs or higher. The normal to the parallel plane of the flat data line is parallel to the direction of the magnetic field. The circular data line is oriented and magnetized by passive magnetic attraction and dynamic torsion, maintaining the same direction as the original pulse magnetization. The data line travels at a speed of 90 m / min in a constant magnetic field, with a constant magnetic field area of ​​2×2 cm. After cooling and shaping, the data line remains in a vertical magnetic attraction coiled shape.

[0058] Finally, after magnetization, in the vertically coiled state after orientation, the data line undergoes another pulse magnetization inside the solenoid with a magnetic field strength of 2.5T.

[0059] The relevant parameters and magnetization results of the examples and comparative examples are recorded in Tables 1 and 2.

[0060]

[0061]

[0062] In the embodiments, the radial shapes of the data lines are racetrack-shaped and square, respectively;

[0063] The permanent magnet material particles of the magnetic layer are approximately spherical in shape, and the material types are as follows: R450: 40% anisotropic ferrite + anisotropic samarium iron nitrogen; R750: 100% anisotropic samarium iron nitrogen.

[0064] The magnetic layer matrix is ​​a mixture of chlorinated polyethylene with at least one of POE and EVA, plasticizer and additives, and the softening and melting temperature is 120-130℃;

[0065] The outer layers are a braided layer and modified PP, and the softening and melting temperature of the outer layer is greater than 160°C, which is at least 30°C higher than that of the magnetic layer.

[0066] The modified PP has a softening melting point temperature of 160-260℃ and is a modified mixture of polypropylene PP with at least one of EPDM, PPS, PVC, silicone, plasticizer, and additives.

[0067] Comparative Example 1 shows that the data line deforms after being heated to the softening melting temperature because the outer coating layer has the same softening temperature as the magnetic material layer. Comparative Example 2 shows that no orientation magnetization process was used. Comparative Examples 1 and 2 only have pulse magnetization in the spiral tube. During magnetization, whether or not heating is applied, or the number of magnetization cycles is increased, the surface magnetism cannot be improved.

[0068] Reference Figure 4 This technical solution is one application of a vertically oriented, disc-shaped, automatically magnetically attracted, freely stretchable data cable. The data cable is in a folded state, and the connectors at both ends of the data cable are located on the same oriented end face of the disc shape.

[0069] Result record:

[0070] In Table 2, embodiments 1-6 of this technical solution use pulse magnetization shaping + constant current orientation pre-charging + pulse magnetization. The pulse magnetization is only 2.5T before and after. Although pulse magnetization exceeding 3T is not used, the surface magnetization can well complete the automatic winding and free stretching function of the data cable.

[0071] In Table 2, the permanent magnet materials containing 40% anisotropic ferrite in Examples 1, 4, and 5, and the high anisotropic field performance of samarium iron nitrogen in Examples 2, 3, and 6 can all be used in data cables, and the magnetic properties can meet the requirements of automatic coiling magnetic attraction of data cables.

[0072] Compared to Examples 1 and 2, without the intermediate constant current field orientation magnetization, the surface magnetism could not be improved even when the final pulse magnetization was performed more than twice. The magnetic properties of samarium iron nitrogen could not be fully utilized, and the data line could not complete the automatic magnetic attraction of the bar in the vertical direction.

[0073] analyze:

[0074] The technical solution of this application adopts a pre-magnetization method, with a constant magnetic field and speed control, allowing sufficient rotation time for the magnetic domains. That is, the extension of the duration of the magnetic material in the magnetic field is used to exchange for the increase of the magnetic field strength to improve the magnetization saturation.

[0075] The design of a magnetic layer softening and melting temperature of 120-130℃ allows the magnetic domains of the magnetic material to achieve the best force-saving balance state in the rotation and disordered tug-of-war of the magnetic domains during the molten state and cooling process, thereby maximizing the rotation and maintenance of magnetic domains of materials with the same or different polarities.

[0076] After the data line is pulse-shaped and then oriented and magnetized, it is difficult to keep the two directions consistent. In this application, the circular data line is passively magnetically attracted and dynamically rotated forward in a constant current field by a single data line pulled from a coil. The flat data line is positioned by the normal direction of two parallel planes, ensuring that the magnetic field directions of the two are consistent.

[0077] By using the different softening points of different structural layer materials, the data line can still maintain its shape in the molten state of the magnetic layer, thus achieving the simultaneous satisfaction of the turning time under low resistance of the molten magnetic domain and the shaping of the data line appearance.

[0078] The folding data cable is magnetized in the same way as a single data cable, so that when using a longer data cable, the front and rear connector ends are on the same end of the vertical coil, making it convenient to use.

Claims

1. A method for preparing a vertical steering wheel strip-shaped automatic magnetic free-stretching data line, characterized by, The data line comprises, from inside to outside, a flexible coated core, a flexible permanent magnetic coating layer in the middle, and a flexible outer layer on the outside, and the preparation method comprises the following steps: Step A, extrusion molding; Step B, vertical direction disk strip shaping by pre-magnetization, then 180° constant magnetic field orientation in the north-south direction, and finally magnetization; The vertical direction disk strip shaping by pre-magnetization comprises: after extrusion molding, the single data line or folded data line is wound around a cylinder in a solenoid, or is curled into a vertical disk strip and placed in the solenoid, the axial center line of the curled data line, the axial center line of the cylinder, and the axial center line of the solenoid are parallel or overlap, and the data line is pulsed magnetized in the solenoid in the curled disk strip state, and the magnetic field strength is 2.0T or above; The 180° constant magnetic field orientation in the north-south direction comprises: the vertical direction disk strip shaped data line after pre-magnetization is heated to the softening and melting temperature of the magnetic layer, the single or folded data line is pulled apart from the disk strip and passed through a 180° permanent magnet magnetic field or a constant current electromagnetic field in the north-south direction, the pre-magnetization is oriented, the magnetic field strength is 5000Gs or above, and the vertical direction magnetic attraction disk strip is maintained after cooling and shaping.

2. The preparation method of the vertical direction disk strip automatic magnetic free stretching data line according to claim 1, characterized in that, The single or folded data line passes through the permanent magnet magnetic field or the constant current electromagnetic field at a speed of 10-120m / min.

3. The method for preparing a vertical steering wheel strip-shaped automatic magnetic free-stretching data line according to claim 1, characterized in that, The single or folded data line passes through the permanent magnet magnetic field or the constant current electromagnetic field, the normal direction of the parallel plane of the flat data line is parallel to the magnetic field direction, and the circular data line is oriented and magnetized in the passive magnetic attraction dynamic twisting forward movement, which is consistent with the pre-magnetization magnetic field direction.

4. The preparation method of a vertical direction disk strip automatic magnetic free stretching data line according to claim 1, characterized in that, The softening and melting temperature of the magnetic layer is 120-130°C.

5. The preparation method of a vertical steering wheel strip-shaped automatic magnetic free-stretching data line according to claim 1, characterized in that, The softening and melting temperature of the flexible outer layer is 30°C or above higher than that of the flexible permanent magnetic coating layer in the middle.

6. The preparation method of a vertical direction disk strip automatic magnetic free stretching data line according to claim 1, characterized in that, The flexible outer layer on the outside is at least one of a high polymer, a woven layer, a skin, and a decorative layer.

7. A method for preparing a vertical direction disk strip automatic magnetic free stretching data line according to any one of claims 1 or 6, characterized in that, The softening and melting temperature of the flexible outer layer on the outside is 130°C to 260°C.

8. The preparation method of a vertical direction disk strip automatic magnetic free stretching data line according to claim 1, characterized in that, The final magnetization, the oriented data line is pulsed magnetized in the solenoid in the vertical direction curled disk strip state, and the magnetic field strength is 2.0T or above.

9. The preparation method of a vertical direction disk strip automatic magnetic free stretching data line according to claim 1, characterized in that, The flexible permanent magnetic coating layer is a flexible modified high polymer composite layer with permanent magnet material powder as filler.

10. The preparation method of a vertical steering wheel strip-shaped automatic magnetic free-stretching data line according to claim 9, characterized in that, The permanent magnet material is at least one of anisotropic samarium iron nitrogen, isotropic or anisotropic ferrite, isotropic or anisotropic neodymium iron boron, cerium iron boron, and samarium cobalt.

11. The preparation method of a vertical direction disk strip automatic magnetic free stretching data line according to claim 9, characterized in that, The base component of the flexible permanent magnetic coating layer is a modified high polymer obtained by blending and processing a thermoplastic elastomer TPE with a plasticizer and an additive.

12. A vertical steering wheel bar automatic magnetic free-stretching data line, comprising one of axisymmetric regular shapes of cross-sectional shapes of a circular type, a flat type, and an elliptical shape, characterized in that, The data line is prepared by the preparation method of the vertical direction disk strip automatic magnetic attraction free stretching data line according to any one of claims 1-11.

13. A vertical steering wheel bar strip automatic magnetic attraction free stretch data line application, characterized by, The data line is prepared by the preparation method of the vertical direction disk strip automatic magnetic attraction data line according to any one of claims 1-11, and the data line connector is one of a USB type-c data connector, a lightning data connector, and an audio data connector.

14. The application of a vertical steering wheel bar automatic magnetic free stretching data line according to claim 13, characterized in that, The front and rear connectors of the data cable are located on the same end face of the vertical magnetic chuck strip, and the data cable is folded.

Images