Resin-coated superconducting wire, superconducting coil, and shield coil

Abstract

A resin-coated superconducting wire has a base resin formed of a synthetic resin material, and a superconducting wire in the base resin, the cross-sectional area of the base resin being equal to or greater than that of the superconducting wire when viewed from the cross section of the resin-coated superconducting wire.

Description

Technical Field

[0001] This disclosure relates to resin-coated superconducting wires, superconducting coils, and shielded coils. Background Technology

[0002] In the past, superconducting materials have been used in shielding coils for applications such as nuclear magnetic resonance (NMR) devices and magnetic resonance imaging (MRI) devices to block magnetic fields from the outside in in order to obtain appropriate analytical results, and to block magnetic fields from the inside out in order to suppress their effects on the human body, electronic devices, etc.

[0003] As such superconducting materials, for example, Figure 6 As shown, there exists a resin-coated superconducting wire 2, which is formed by coating a superconducting wire 22, such as an NbTi wire, with a stable copper 21 called a copper channel, and surrounding it with a braided fabric of a resin such as polyester 23. In such a resin-coated superconducting wire 2, by coating the superconducting wire 22 with the stable copper 21, the heat generated by the superconducting wire 22 is released to the outside, and it is cooled by immersion in, for example, liquid helium, thereby suppressing its temperature rise.

[0004] In addition, in order to improve the heating efficiency of superconducting materials, Patent Document 1 proposes a superconducting wire formed by embedding multiple superconducting wires in stabilizing copper, coating them with resin, and further embedding them in stabilizing copper.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Japanese Patent Publication No. 2017-533579 Summary of the Invention

[0008] The problem that the invention aims to solve

[0009] However, since the aforementioned conventional superconducting materials all use high-purity metals such as stabilized copper around the superconducting wire, they are relatively expensive and heavy. In addition, they are prone to creasing, which makes them less maneuverable.

[0010] This disclosure is made in view of the above circumstances and is intended to provide a resin-coated superconducting wire that is lighter, more flexible and cheaper than before.

[0011] Methods for solving problems

[0012] [1] A resin-coated superconducting wire, comprising: a matrix resin formed of a synthetic resin material; and a superconducting wire in the matrix resin, wherein the cross-sectional area of ​​the matrix resin is greater than or equal to the cross-sectional area of ​​the superconducting wire when viewed from the cross-section of the resin-coated superconducting wire.

[0013] [2] The resin-coated superconducting wire as described in [1] above is characterized in that the superconducting wire comprises one or more superconducting materials selected from the group consisting of metal / niobium titanium, metal / niobium tritin, metal / magnesium diboride, rare earth and bismuth superconducting materials.

[0014] [3] The resin-coated superconducting wire as described in [1] or [2] above is characterized in that the synthetic resin material is a thermoplastic resin.

[0015] [4] The resin-coated superconducting wire as described in [3] above is characterized in that the melting point of the aforementioned thermoplastic resin is below 290°C.

[0016] [5] The resin-coated superconducting wire as described in [3] or [4] above is characterized in that the melting point of the aforementioned thermoplastic resin is below 210°C.

[0017] [6] The resin-coated superconducting wire as described in any one of [1] to [5] above is characterized in that the aforementioned synthetic resin material is polyamide or polyolefin.

[0018] [7] The resin-coated superconducting wire as described in [6] above is characterized in that the aforementioned polyamide is nylon.

[0019] [8] The resin-coated superconducting wire as described in any one of [1] to [7] above, characterized in that the aforementioned synthetic resin material is nylon 11, nylon 12 or polyethylene.

[0020] [9] The resin-coated superconducting wire as described in any one of [1] to [5] above is characterized in that the aforementioned synthetic resin material is an amorphous resin having a glass transition temperature of 250°C or less.

[0021]

[10] The resin-coated superconducting wire as described in any one of [1] to [9] above is characterized in that the aforementioned resin-coated superconducting wire is a multilayer coated wire in which the aforementioned matrix resin is composed of two or more matrix resin layers, wherein the two or more matrix resin layers are composed of an inner matrix resin layer covering the outer periphery of the aforementioned superconducting wire and an outer matrix resin layer of one or more covering the outer side of the aforementioned inner matrix resin layer.

[0022]

[11] The resin-coated superconducting wire as described in

[10] above is characterized in that the aforementioned inner matrix resin layer is an olefin resin or a copolymer thereof containing at least one functional group selected from the group consisting of epoxy, oxazolyl, amino and maleic anhydride residues.

[0023]

[12] The resin-coated superconducting wire as described in

[10] above is characterized in that the aforementioned inner matrix resin layer is an olefin copolymer containing a metal salt of carboxylic acid.

[0024]

[13] The resin-coated superconducting wire as described in any one of [1] to

[12] above, characterized in that the superconducting wire is a single wire.

[0025]

[14] The resin-coated superconducting wire as described in any one of [1] to

[12] above, characterized in that the superconducting wire is a stranded wire.

[0026]

[15] The resin-coated superconducting wire as described in any one of [1] to

[14] above is characterized in that the cross-sectional shape of the aforementioned resin-coated superconducting wire is a flat shape.

[0027]

[16] The resin-coated superconducting wire as described in any one of [1] to

[14] above is characterized in that the cross-sectional shape of the aforementioned resin-coated superconducting wire is circular.

[0028]

[17] The resin-coated superconducting wire as described in any one of [1] to

[16] above is characterized in that the dimensional accuracy of the width and thickness of the aforementioned resin-coated superconducting wire is ±0.10 mm or less.

[0029]

[18] The resin-coated superconducting wire as described in any one of [1] to

[17] above is characterized in that the dimensional accuracy of the width and thickness of the aforementioned resin-coated superconducting wire is less than ±0.05 mm.

[0030]

[19] A superconducting coil, which is made of a superconducting wire coated with resin as described in any one of [1] to

[18] above.

[0031]

[20] A shielded coil, which is made of resin-coated superconducting wire as described in any one of [1] to

[18] above.

[0032] The effects of the invention

[0033] According to this disclosure, it is possible to provide resin-coated superconducting wires that are lighter, more flexible, and less expensive than those previously available. Attached Figure Description

[0034] [ Figure 1 ] Figure 1 This is a cross-sectional view of a resin-coated superconducting wire (flat shape) according to one embodiment.

[0035] [ Figure 2 ] Figure 2 This is a cross-sectional view of a resin-coated superconducting wire (circular) according to one embodiment.

[0036] [ Figure 3 ] Figure 3 This is a cross-sectional view of a resin-coated superconducting wire (flat shape) according to one embodiment.

[0037] [ Figure 4 ] Figure 4 This is a cross-sectional view of a resin-coated superconducting wire (circular) according to one embodiment.

[0038] [ Figure 5 ] Figure 5 (a) to (f) are cross-sectional views showing various variations of resin-coated superconducting wires (flat shape).

[0039] [ Figure 6 ] Figure 6 This is a cross-sectional view of a conventional resin-coated superconducting wire. Detailed Implementation

[0040] The preferred embodiments of this disclosure will be described in detail below, but this disclosure is not limited to the following embodiments.

[0041] The inventors of this application have discovered that a resin-coated superconducting wire has a matrix resin formed of a synthetic resin material and a superconducting wire in the matrix resin. When viewed from the cross-section of the resin-coated superconducting wire, the cross-sectional area of ​​the matrix resin is greater than or equal to the cross-sectional area of ​​the superconducting wire. As a result, a resin-coated superconducting wire that is lighter, more flexible, and cheaper than conventional ones can be provided, thus completing the present disclosure.

[0042] 1. Resin-coated superconducting wire

[0043] The resin-coated superconducting wire disclosed herein has a matrix resin formed of a synthetic resin material and a superconducting wire within the matrix resin. Furthermore, in the resin-coated superconducting wire, when viewed from a cross-section, the cross-sectional area of ​​the matrix resin is greater than or equal to the cross-sectional area of ​​the superconducting wire.

[0044] Figure 1 This is a cross-sectional view of a resin-coated superconducting wire according to one embodiment. Figure 2 This is a cross-sectional view of a resin-coated superconducting wire according to one embodiment. Figures 1-2 As shown, the resin-coated superconducting wire 1 has a matrix resin 11 formed of a synthetic resin material and a superconducting wire 12 within the matrix resin 11. Furthermore, in this embodiment, when viewed in cross-section, the cross-sectional area of ​​the matrix resin 11 is greater than or equal to the cross-sectional area of ​​the superconducting wire 12. It should be noted that... Figure 1 1 is a resin-coated superconducting wire with a flat cross-sectional shape. Figure 2 1 is a resin-coated superconducting wire with a circular cross-sectional shape. Additionally, Figures 1-2 The resin-coated superconducting wire 1 shown is a single-layer coated wire consisting of a matrix resin 11 composed of a single-layer matrix resin layer covering the outer periphery of the superconducting wire 12.

[0045] In applications involving shielded coils, the current flowing through the superconducting wire 12 constituting the resin-coated superconducting wire 1 is relatively small. Therefore, the superconducting wire 12 used for such applications is less prone to quenching, and even if quenching does occur, the current is very small, thus eliminating the need for a large amount of stabilizing copper composite. On the other hand, to ensure the shielding effect of the magnetic field of the shielded coil, when the resin-coated superconducting wire 1 is wound as a coil, adjacent superconducting wires 12, 12 need to be spaced apart from each other by a certain distance. Therefore, the superconducting wire 12 is extended (preferably embedded) within a matrix resin 11 that is equal to or larger than its cross-sectional area. Thus, in the resin-coated superconducting wire, the matrix resin 11 acts as a spacer, enabling adjacent superconducting wires 12, 12 to be spaced apart from each other by a certain distance.

[0046] [Matrix resin]

[0047] The matrix resin 11 is a substance formed from synthetic resin material. The matrix resin 11 is a substance that ensures insulation between the superconducting wires 12 and acts as a spacer, as described above, separating adjacent superconducting wires 12 by a certain distance. It should be noted that the matrix resin is in a solid state and does not include substances made of braided yarn.

[0048] As the base resin 11, a thermoplastic resin capable of extrusion molding is preferred, and polyamide or polyolefin is more preferred. The extrusion molding is an effective method for thick-wall coating molding where the cross-sectional area of ​​the base resin 11 is set to be greater than or equal to the cross-sectional area of ​​the superconductor 12 when viewed from the cross-section of the resin-coated superconductor 1. Nylon is preferred as the polyamide. Regarding the aforementioned thermoplastic resins, examples such as polyethylene, polypropylene, polystyrene, nylon 11, nylon 12, nylon 6, nylon 66, nylon 610, nylon MXD6 (a condensation polymer of isophthalamide and adipic acid), polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyphenylene sulfide, tetrafluoroethylene-hexafluoropropylene copolymer (FEP), tetrafluoroethylene-ethylene copolymer (ETFE), polycarbonate, polyphenylene ether, polyetherimide, polyethersulfone, etc., are preferred. These resins can be monomers or mixtures of two or more resins.

[0049] It should be noted that the synthetic resin material constituting the matrix resin 11 can be a substance formed solely of synthetic resin, or a substance comprising a resin composition primarily composed of synthetic resin. This resin composition may contain various additives commonly found in resin compositions, such as fillers and antioxidants, which improve mechanical or chemical durability. For example, by adding fillers to the matrix resin 11, the thermal shrinkage rate of the matrix resin 11 can be reduced to be close to that of the superconducting wire 12, thereby improving the thermal cycling performance of the resin-coated superconducting wire 1.

[0050] Furthermore, when the matrix resin 11 is a crystalline resin, the melting point of the matrix resin 11 is preferably 290°C or lower, more preferably 280°C or lower, and even more preferably 270°C or lower. When the matrix resin 11 is manufactured by heat molding, the lower the melting point of the resin used as the raw material, the more it can be molded at a low temperature. Therefore, it is possible to suppress the performance degradation of the superconducting wire 12 caused by heating during molding.

[0051] Regarding the crystalline resin constituting the matrix resin 11, polyethylene, polypropylene, nylon 11, nylon 12, nylon 6, nylon 66, nylon 610, nylon MXD6, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyphenylene sulfide, tetrafluoroethylene-hexafluoropropylene copolymer (FEP), and tetrafluoroethylene-ethylene copolymer (ETFE) are preferred.

[0052] From the viewpoint of further suppressing the performance degradation of the superconducting wire 12 caused by heating during molding as described above, the melting point of the matrix resin 11 is preferably 210°C or lower, more preferably 200°C or lower, and even more preferably 190°C or lower. Among the crystalline resins constituting the matrix resin 11, polyethylene, polypropylene, nylon 11, and nylon 12 are preferred.

[0053] The matrix resin 11 is preferably nylon or polyolefin, and more preferably nylon 11, nylon 12, nylon 6, nylon 66, nylon 610, nylon MXD6, polyethylene, or polypropylene. In particular, considering the low melting point, low heat shrinkage, excellent water resistance (low water absorption), softness, and mechanical properties, nylon 11, nylon 12, polyethylene, or polypropylene are even more preferred.

[0054] Furthermore, when the matrix resin 11 is an amorphous resin, the glass transition temperature of the synthetic resin material constituting the matrix resin 11 is preferably 250°C or lower, more preferably 240°C or lower, and even more preferably 230°C or lower. For example, when the matrix resin 11 is manufactured by heat molding, the lower the glass transition temperature of the raw material, the more likely the resin coating molding process can be performed at low temperatures. Therefore, it is possible to suppress the performance changes of the superconducting wire 12 caused by heating during molding.

[0055] Regarding the amorphous resin constituting the matrix resin 11, polycarbonate, polyphenylene ether, polyetherimide, polyethersulfone, etc. are preferred.

[0056] Figure 3 Cross-sectional views of other examples of resin-coated superconducting wires (flat shape). Figure 4Cross-sectional views of other examples of resin-coated superconducting wires (circular). Figures 3-4 The resin-coated superconducting wire 1 shown is a multilayer coated wire in which a matrix resin 11, composed of multiple matrix resin layers, covers the outer periphery of the superconducting wire 12. Specifically, in Figures 3-4 In, with Figures 1-2 Unlike other materials, the matrix resin 11 consists of an annular inner matrix resin layer 11a covering the outer periphery of the superconducting wire 12, and one or more outer matrix resin layers 11b covering the inner matrix resin layer 11a from the outside. It should be noted that... Figures 3-4 The image shows a two-layer structure of the matrix resin 11, consisting of an inner matrix resin layer 11a and an outer matrix resin layer 11b.

[0057] like Figures 3-4 As shown, the resin-coated superconducting wire 1 is preferably a multilayer coated wire having two or more matrix resin layers, such as an inner matrix resin layer 11a and an outer matrix resin layer 11b, and more preferably a multilayer coated wire with two to four matrix resin layers. By making the resin-coated superconducting wire 1 a multilayer coated wire, the amount of resin used in a single extrusion coating is reduced, thereby improving the dimensional accuracy of the extruded coated wire. Furthermore, by using different resins in each matrix resin layer, the functionality of the resin-coated superconducting wire 1 can be further improved.

[0058] Specifically, in the case of polyolefin resins such as polyethylene and polypropylene with low adhesion to the superconducting wire 12, the adhesion between the superconducting wire 12 and the outer polyolefin resin 11b can be improved by fabricating a multilayer coated wire in which the inner matrix resin layer 11a, which is the first layer on the conductor side, is an olefin resin or a copolymer thereof (also called copolymer (A)) containing at least one functional group selected from epoxy, oxazolyl, amino, and maleic anhydride residues. Furthermore, the same improvement in adhesion can also be expected by fabricating a multilayer coated wire in which the inner matrix resin layer 11a is an olefin copolymer (also called olefin copolymer (B)) containing a metal salt of carboxylic acid.

[0059] As olefin components constituting copolymer (A), ethylene, propylene, butene-1, pentene-1, 4-methylpentene-1, isobutene, hexene-1, decene-1, octene-1, 1,4-hexadiene, and dicyclopentadiene are preferred, among which ethylene, propylene, and butene-1 are preferred. Furthermore, these components may be used alone or in combination with two or more.

[0060] As a copolymer component other than the olefin constituting copolymer (A), it can be a component of at least one of acrylic components and vinyl components.

[0061] Preferred acrylic components include acrylic acid, methyl acrylate, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, tert-butyl acrylate, isobutyl acrylate, methyl methacrylate, ethyl methacrylate, and butyl methacrylate. Suitable vinyl components include vinyl acetate, vinyl propionate, vinyl butyrate, vinyl chloride, vinyl alcohol, and styrene. Methyl acrylate and methyl methacrylate are more preferred. Furthermore, the above components can be used alone or in combination with two or more. Representative preferred examples of copolymers (A) include polyethylene or polypropylene grafted with maleic anhydride, and ethylene / glycidyl methacrylate copolymers. Commercially available resins include Admer (manufactured by Mitsui Chemicals Co., Ltd., trade name), Bondfast (manufactured by Sumitomo Chemical Co., Ltd., trade name), and Lotader (manufactured by Atofina Co., Ltd., trade name).

[0062] Preferably, the carboxylic acid constituting the olefin copolymer (B) can be an unsaturated monocarboxylic acid such as acrylic acid, methacrylic acid, and crotonic acid, or an unsaturated dicarboxylic acid such as maleic acid, fumaric acid, and phthalic acid. Salts of the aforementioned metal can be salts of Zn, Na, K, Mg, etc. Preferably, a portion of the carboxylic acid in the ethylene-methacrylic acid copolymer is made into a metal salt, and a resin commonly referred to as an ion-crosslinked polymer (e.g., HiMilan; trade name, manufactured by Mitsui Polymer Chemicals Co., Ltd.) can be used as such.

[0063] As for the matrix resin 11, the thermal shrinkage rate calculated by the following method is preferably 5% or less, more preferably 2% or less, and even more preferably 1% or less. This allows for the suppression of damage and deterioration of the matrix resin 11 when it is impregnated with a refrigerant such as liquid helium.

[0064] (Method for calculating thermal shrinkage rate)

[0065] A 0.2g piece of resin-coated superconducting wire 1 cut along the long side of the resin-coated superconducting wire 1 was immersed in 500mL of liquid helium for several minutes. The size of the resin-coated superconducting wire 1 was measured, and the thermal shrinkage rate was calculated using the following formula (1).

[0066] Heat shrinkage rate (%) = {(size of resin-coated superconducting wire before impregnation - size of resin-coated superconducting wire after impregnation) / size of resin-coated superconducting wire before impregnation} × 100 ··· Equation (1)

[0067] As for the matrix resin 11, the water absorption rate calculated using the following method is more preferably 1.0% or less, and even more preferably 0.7% or less. The lower the water absorption rate, the less swelling occurs on the surface of the matrix resin 11. Therefore, damage and deterioration caused by water absorption of the matrix resin 11 can be suppressed, and the reduction in mechanical strength caused by deterioration and cracking due to water absorption of the matrix resin 11 can be suppressed. It should be noted that the calculation method shown below is one of the methods for determining the water absorption rate of plastics specified in JIS K7209.

[0068] (Method for calculating water absorption rate)

[0069] 1.0g of resin-coated superconducting wire 1 cut along the long side of the resin-coated superconducting wire 1 was immersed in 500mL of water at 23℃ for 24 hours, the surface water was wiped off, and the mass of the resin-coated superconducting wire 1 was measured. The water absorption rate was calculated by the following formula (2).

[0070] Water absorption rate (%) = {(mass of resin-coated superconducting wire before impregnation - mass of resin-coated superconducting wire after impregnation) / mass of resin-coated superconducting wire before impregnation} × 100 ··· Equation (2)

[0071] [Superconducting wire]

[0072] The superconducting wire 12 is a wire in the matrix resin 11 described above, and has superconductivity.

[0073] The dimension of the cross-section of the superconducting wire 12 is preferably, for example, circular. More preferably Further preferred In addition, if the cross-section of the superconducting wire 12 is flat, its long side is preferably 0.8mm to 2.5mm, more preferably 1.5mm to 2.0mm, and its short side is preferably 0.5mm to 1.5mm, more preferably 0.9mm to 1.2mm.

[0074] As the superconducting wire 12, it is preferably composed of one or more superconducting materials selected from the group consisting of metal / niobium-titanium, metal / niobium-tritin, metal / magnesium diboride, rare earth-based, and bismuth-based superconducting materials. It should be noted that "metal / niobium-titanium", "metal / niobium-tritin", or "metal / magnesium diboride" refers to a material that is composited by coating niobium-titanium, niobium-tritin, or magnesium diboride with metals such as copper or iron.

[0075] Specifically, YBa2Cu3O can be cited as an example of a rare earth material. 7-δ GdBa2Cu3O 7-δ Examples of bismuth-based materials include Bi₂Sr₂Ca₂Cu₃O. 10+δ Bi2Sr2CaCu2O8+δ wait.

[0076] As the superconducting wire 12, any of the following can be used: a single wire or a stranded wire made of multiple strands.

[0077] [Relationship between matrix resin and superconducting wire]

[0078] As described above, in the resin-coated superconducting wire 1, when viewed from its cross-section, the cross-sectional area of ​​the matrix resin 11 is greater than or equal to the cross-sectional area of ​​the superconducting wire 12.

[0079] Furthermore, when viewed from the cross-section of the resin-coated superconducting wire 1, the ratio of the cross-sectional area of ​​the matrix resin 11 to the cross-sectional area of ​​the superconducting wire 12 (the ratio of the cross-sectional area of ​​the matrix resin 11 to the cross-sectional area of ​​the superconducting wire 12) is preferably 2 times or more, more preferably 5 times or more, further preferably 10 times or more, particularly preferably 20 times or more, and most preferably 40 times or more. Regarding the aforementioned upper limit of the cross-sectional area ratio, from a practical point of view, such as suitability as a coil raw material and operability in winding operations, it is preferably set to 1000 times.

[0080] Furthermore, when observing the resin-coated superconducting wire 1 in cross-section, in Figures 1-2 The diagram shows the superconducting wire 12 located at the center (center of gravity) of the matrix resin 11, but it can exist at any location within the matrix resin 11 as long as it does not protrude from the surface of the resin-coated superconducting wire 1 (as long as the resin component of the matrix resin 11 is present on the surface of the resin-coated superconducting wire, even in small amounts). For example, Figure 5 (a) to (f) show modified examples of the cross-sections of resin-coated superconducting wires 1A to 1F with flat cross-sections, in which superconducting wires 12A to 12F are disposed at different cross-sectional positions of the matrix resins 11A to 11F.

[0081] In a resin-coated superconducting wire, a superconducting wire 12 is configured as a single wire or a stranded wire relative to a matrix resin 11.

[0082] For resin-coated superconducting wires, the cross-sectional shape can be circular (including elliptical), triangular, square, flat, etc., and a flat shape is preferred for ease of coil formation. It should be noted that when the cross-sectional shape of the resin-coated superconducting wire is flat, the cross-sectional shape of the resin-coated superconducting wire also includes shapes with an R value of less than 1 mm at the corners.

[0083] When the resin-coated superconducting wire is flat, the long side of the cross-section of the resin-coated superconducting wire is preferably 0.5 mm to 10 mm, more preferably 1 mm to 7 mm. Similarly, the short side of the cross-section of the resin-coated superconducting wire is preferably 0.1 mm to 5 mm, more preferably 0.5 mm to 3 mm.

[0084] The dimensional accuracy of the width and thickness of the resin-coated superconducting wire is preferably ±0.10 mm or less, and more preferably ±0.05 mm or less. It should be noted that "dimensional accuracy" refers to the range of difference between the maximum and minimum dimensions of a single resin-coated superconducting wire. By achieving such dimensional accuracy, the resin-coated superconducting wire can achieve higher electromagnetic shielding performance. It should be noted that, to achieve such dimensional accuracy, a method of scraping the outer surface after resin extrusion processing can be cited. Alternatively, a method of further coating the surface of the aforementioned base resin with a material such as a UV-curable resin can be cited.

[0085] The resin-coated superconducting wires described above can be applied to superconducting coils, and in particular, to shielded coils used in NMR devices, MRI examination devices, and the like.

[0086] The voltage that can be applied to the resin-coated superconducting wire as described above is not particularly limited, but for example, it is preferably 0 to 50V, more preferably 0 to 20V, and even more preferably 0 to 10V.

[0087] In addition, compared with conventional superconducting wires with stable copper, resin-coated superconducting wires are lightweight and inexpensive. They are also more flexible and have better flexibility because they are less prone to creasing. Therefore, they are easy to handle and easy to wind when coiling.

[0088] 2. Manufacturing method of resin-coated superconducting wire

[0089] Regarding the resin-coated superconducting wires of the embodiments described above, they can be manufactured, for example, by inserting the superconducting wires into the synthetic resin raw material constituting the matrix resin and using extrusion molding in the same manner as the manufacturing method of extruded molded articles of conventional resin materials. The heating temperature, extrusion speed, etc., can be appropriately adjusted according to the type of synthetic resin raw material, the size and shape of the molded article to be formed, etc.

[0090] Furthermore, in the prior art, there is a two-stage process of pre-coating the superconducting wire, which serves as the main wire, with resin before embedding the copper channel. On the other hand, in the resin-coated superconducting wire of the embodiment, since the base resin can be molded into the same shape as the copper channel, the conventional two-stage process can be completed in a single-stage process.

[0091] Example

[0092] Next, to further clarify the effects of this disclosure, embodiments will be described, but this disclosure is not limited to these embodiments.

[0093] (Examples 1-40)

[0094] Nylon 11 (manufactured by ARKEMA, BESN Noir TL), Nylon 12 (manufactured by Ube Industries, UBESTA 3030LUX), Nylon 6 (manufactured by Ube Industries, UBESTA 1024JI), Nylon 66 (manufactured by Asahi Kasei, Leona (registered trademark) 1300S), and high-density polyethylene (manufactured by Asahi Kasei, Suntec (registered trademark) - HD B891) were used as raw materials for the synthetic resin material. Copper / niobium-titanium superconducting wires were inserted into the raw material of synthetic resin material and extruded using a die in the form of a flat shape (Examples 1-20) or a spherical shape (Examples 21-40) with the dimensions shown in Tables 2 and 3 below, at a temperature condition between +20°C and +80°C for the melting point of each resin material. It should be noted that, as... Figure 1 and Figure 2 As shown, the superconducting wires are arranged so that they become the center of the synthetic resin material. In Examples 1-20, resin-coated superconducting wires with a flat cross-sectional shape were manufactured. In Examples 21-40, resin-coated superconducting wires with a circular cross-sectional shape were manufactured.

[0095] (Example 41)

[0096] Using high-density polyethylene (Asahi Kasei, Suntec (registered trademark) - HD B891) as the raw material for the synthetic resin, a modified low-density polyethylene (Mitsui Chemicals, Admer NB508) grafted with maleic anhydride was coated with a 20μm thick layer. Copper / niobium-titanium superconducting wires are inserted into the raw material of synthetic resin material and extruded using a flat die with the dimensions shown in Table 4 below, at a temperature above +20°C and below the melting point of each resin material. It should be noted that, as... Figure 3 As shown, the superconducting wire is configured to be central to the synthetic resin material.

[0097] (Example 42)

[0098] It was made using an ethylene-methacrylic acid copolymer (Mitsui Polymer Chemicals, HiMilan 1855) coated with a metal salt of a portion of the carboxylic acid, with a thickness of 20 μm. The copper / niobium-titanium superconducting wires, except that resin-coated superconducting wires were obtained in the same manner as in Example 41.

[0099] (Example 43)

[0100] Using high-density polyethylene (Asahi Kasei, Suntec (registered trademark) - HD B891) as the raw material for the synthetic resin, a modified low-density polyethylene (Mitsui Chemicals, Admer NB508) grafted with maleic anhydride was coated with a 20μm thick layer. Copper / niobium-titanium superconducting wires are inserted into the raw material of synthetic resin material and extruded using a spherical die with the dimensions shown in Table 5 below, at a temperature above +20°C and below the melting point of each resin material. It should be noted that, as... Figure 4 As shown, the superconducting wire is configured to be central to the synthetic resin material.

[0101] Regarding the cross-sectional area of ​​the matrix resin, when viewed from the cross-section of the resin-coated superconducting wire, the cross-sectional area of ​​the outer shape is determined from the outer dimensions of the resin-coated superconducting wire, and then calculated from the difference between this cross-sectional area and the cross-sectional area of ​​the superconducting wire. From the cross-sectional area of ​​the matrix resin, the mass and cost of resin per 1000m length of resin-coated superconducting wire, as well as their copper conversion values, are calculated. The results are shown in Tables 2 to 5 below. It should be noted that in Tables 2 to 5, the copper conversion values ​​in parentheses are based on the same volume.

[0102] Furthermore, the melting point, glass transition temperature, thermal shrinkage rate, and water absorption rate of the respective synthetic resin materials used in Examples 1 to 43 are shown in Table 1. It should be noted that the thermal shrinkage rate and water absorption rate were determined using the methods described above.

[0103] [Table 1]

[0104]

[0105] [Table 2]

[0106]

[0107] [Table 3]

[0108]

[0109] [Table 4]

[0110]

[0111] [Table 5]

[0112]

[0113] Regarding the resin-coated superconducting wires of Examples 1 to 43, it can be confirmed that they can be obtained with the same dimensions as superconducting wires using conventional copper channels, and that they can achieve the same magnetic shielding characteristics as superconducting wires using conventional copper channels.

[0114] Furthermore, it is known that, for the resin-coated superconducting wires of Examples 1 to 43, as shown in Tables 2 to 5 above, compared with copper-coated superconducting wires, a significant reduction in weight and a reduction in raw material costs can be achieved.

[0115] Explanation of reference numerals in the attached figures

[0116] 1, 1A, 1B, 1C, 1D, 1E, 1F, 2 Resin-coated superconducting wires

[0117] 11, 11A, 11B, 11C, 11D, 11E, 11F Matrix Resins

[0118] 11a Inner matrix resin layer

[0119] 11b Outer matrix resin layer

[0120] 12, 12A, 12B, 12C, 12D, 12E, 12F, 22 superconducting wires

[0121] 21 Stable copper

Claims

1. Resin-coated superconducting wire, which has the following characteristics: A matrix resin formed from synthetic resin materials; and Superconducting wires in the matrix resin. The resin-coated superconducting wire is manufactured by inserting superconducting wires into synthetic resin raw materials that constitute the matrix resin and then using extrusion molding. The resin-coated superconducting wire is characterized in that... When viewed from the cross-section of the resin-coated superconducting wire, the cross-sectional area of ​​the matrix resin is greater than or equal to the cross-sectional area of ​​the superconducting wire. The synthetic resin material is a thermoplastic resin with a melting point below 290°C, and is selected from one or more resins grouped from polypropylene, polystyrene, nylon 11, nylon 12, nylon 6, nylon 66, nylon 610, nylon MXD6 (a condensation polymer of m-phenylenediamine and adipic acid), polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyphenylene sulfide, tetrafluoroethylene-hexafluoropropylene copolymer (FEP), and tetrafluoroethylene-ethylene copolymer (ETFE).

2. The resin-coated superconducting wire as described in claim 1, characterized in that, The superconducting wire comprises one or more superconducting materials selected from the group consisting of metal / niobium-titanium, metal / niobium-tin, metal / magnesium diboride, rare earth-based, and bismuth-based superconducting materials.

3. The resin-coated superconducting wire as described in claim 1, characterized in that, The melting point of the thermoplastic resin is below 210°C.

4. Resin-coated superconducting wire, which has the following characteristics: A matrix resin formed from synthetic resin materials; and Superconducting wires in the matrix resin. The resin-coated superconducting wire is manufactured by inserting superconducting wires into synthetic resin raw materials that constitute the matrix resin and then using extrusion molding. The resin-coated superconducting wire is characterized in that... When viewed from the cross-section of the resin-coated superconducting wire, the cross-sectional area of ​​the matrix resin is greater than or equal to the cross-sectional area of ​​the superconducting wire. The synthetic resin material is an amorphous resin having a glass transition temperature below 250°C, and is one or more resins selected from the group consisting of polycarbonate, polyphenylene ether, polyetherimide, and polyethersulfone.

5. The resin-coated superconducting wire as described in claim 1 or 4, characterized in that, The resin-coated superconducting wire is a multilayer coated wire in which the matrix resin is composed of two or more matrix resin layers. The two or more matrix resin layers are composed of an inner matrix resin layer covering the outer periphery of the superconducting wire and one or more outer matrix resin layers covering the outer side of the inner matrix resin layer.

6. The resin-coated superconducting wire as described in claim 5, characterized in that, The inner matrix resin layer is an olefin resin or a copolymer thereof containing at least one functional group selected from the group consisting of epoxy, oxazolyl, amino and maleic anhydride residues.

7. The resin-coated superconducting wire as described in claim 5, characterized in that, The inner matrix resin layer is an olefin copolymer containing a metal salt of carboxylic acid.

8. The resin-coated superconducting wire as described in claim 1 or 4, characterized in that, The superconducting wire is a single wire.

9. The resin-coated superconducting wire as described in claim 1 or 4, characterized in that, The superconducting wire is a stranded wire.

10. The resin-coated superconducting wire as described in claim 1 or 4, characterized in that, The cross-sectional shape of the resin-coated superconducting wire is flat.

11. The resin-coated superconducting wire as described in claim 1 or 4, characterized in that, The cross-sectional shape of the resin-coated superconducting wire is circular.

12. The resin-coated superconducting wire as described in claim 1 or 4, characterized in that, The dimensional accuracy of the width and thickness of the resin-coated superconducting wire is less than ±0.10 mm.

13. The resin-coated superconducting wire as described in claim 1 or 4, characterized in that, The dimensional accuracy of the width and thickness of the resin-coated superconducting wire is less than ±0.05 mm.

14. A resin-coated superconducting wire, which has the following characteristics: A matrix resin formed from synthetic resin materials; and Superconducting wires in the matrix resin. The resin-coated superconducting wire is manufactured by inserting superconducting wires into synthetic resin raw materials that constitute the matrix resin and then using extrusion molding. The resin-coated superconducting wire is characterized in that... When viewed from the cross-section of the resin-coated superconducting wire, the cross-sectional area of ​​the matrix resin is greater than or equal to the cross-sectional area of ​​the superconducting wire. The superconducting wire is a single wire or a stranded wire.

15. A superconducting coil, which is made using a resin-coated superconducting wire according to any one of claims 1 to 14.

16. A shielded coil, which is made using a resin-coated superconducting wire according to any one of claims 1 to 14.

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