Signal transmission core wire and signal transmission core wire pair

Abstract

The invention discloses a signal transmission core wire, which comprises a conductor and an insulating layer coated outside the conductor, and the insulating layer is prepared from white carbon black and fluororesin materials. The white carbon black can be filled in molecular chain gaps of the fluororesin to form a three-dimensional network structure, so that the thermal motion of the molecular chains of the fluororesin is limited, the signal transmission performance and the mechanical performance of the material are improved, and the signal transmission performance and the mechanical performance of the insulating layer are further improved.

Description

Technical Field

[0001] This application relates to the field of signal transmission, and in particular to signal transmission core wires and their preparation methods. Background Technology

[0002] Signal transmission refers to the process of transmitting electromagnetic signals in an insulating medium. The dielectric constant of the insulating medium is one of the most critical parameters. The smaller the dielectric constant, the smaller the signal attenuation, the lower the transmission delay, and the better the signal fidelity and low latency during transmission. Summary of the Invention

[0003] The purpose of this invention is to provide a signal transmission core wire that addresses the problem of high dielectric constant in signal transmission core wires.

[0004] In a first aspect, the present invention provides a signal transmission core wire, comprising a conductor and an insulating layer covering the conductor, the insulating layer being made of a material comprising silica and fluoropolymer.

[0005] In one embodiment, the material comprising silica and fluoropolymer is extruded and coated onto the conductor.

[0006] In one embodiment, the silica is fumed silica.

[0007] In one embodiment, the fumed silica is fumed silica modified with a modifier.

[0008] In one embodiment, the fluororesin is a meltable polytetrafluoroethylene or a fluorinated ethylene propylene copolymer, or a meltable polytetrafluoroethylene and a fluorinated ethylene propylene copolymer.

[0009] In one embodiment, the mass ratio of the silica to the fluororesin is (0.5-50):100.

[0010] In one embodiment, the mass ratio of the silica to the fluororesin is (0.5-10):100.

[0011] In one embodiment, an inner skin layer is provided between the conductor and the insulating layer.

[0012] In one embodiment, the insulating layer is covered with an outer skin layer.

[0013] In a second aspect, the present invention provides a signal transmission core pair, comprising the signal transmission cores described above.

[0014] In one embodiment, the signal transmission core wire includes a conductor, an inner sheath layer is provided between the conductor and the insulation layer, and an outer sheath layer is provided outside the insulation layer, with the inner sheath layer, the insulation layer and the outer sheath layer sequentially covering the conductor.

[0015] In one embodiment, the signal transmission core pair includes a pair of signal transmission cores, the pair of signal transmission cores are covered with a sheath layer, and the sheath layer is covered with a shielding protective layer.

[0016] In one embodiment, the shielding protective layer includes a shielding layer and a wrapping layer, wherein the shielding layer covers the outer side of the sheath layer, and the wrapping layer covers the outer side of the shielding layer.

[0017] In one embodiment, a ground wire is provided between the sheath layer and the shielding protection layer.

[0018] In one embodiment, the signal transmission core wire includes two conductors, two inner sheaths, an insulating layer, and an outer sheath. The two conductors are arranged in parallel, each conductor is covered by an inner sheath, the insulating layer covers the two inner sheaths, and the insulating layer is covered by an outer sheath.

[0019] In one embodiment, the signal transmission core is covered with a shielding protective layer.

[0020] In one embodiment, the shielding protective layer includes a shielding layer and a wrapping layer, wherein the shielding layer covers the outer skin layer and the wrapping layer covers the shielding layer.

[0021] In one embodiment, a ground wire is provided between the signal transmission core wire and the shielding protection layer.

[0022] The signal transmission core wire of this invention includes a conductor and an insulating layer covering the conductor. The insulating layer is made of a material including silica and fluoropolymer. Because silica can fill the gaps between the molecular chains of the fluoropolymer, forming a three-dimensional network structure, it restricts the thermal motion of the fluoropolymer molecular chains, improving the signal transmission performance and mechanical properties of the material, and consequently improving the signal transmission performance and mechanical properties of the insulating layer. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of an embodiment of the signal transmission core wire of the present invention;

[0025] Figure 2 This is a schematic diagram of the structure of a signal transmission core pair according to an embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of another embodiment of the signal transmission core pair of the present invention;

[0027] Explanation of icon numbers:

[0028] label name label name 100 Signal transmission core wire 200 Signal transmission core pair 110 conductor 210 Sheath layer 120 Endodermis 220 Shielding protective layer 130 Insulation layer 221 Shielding layer 131 precipitate 222 Packaging layer 132 Fluororubber 230 ground wire 140 outer skin

[0029] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0031] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0032] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0033] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the word "and / or" throughout the text means including three parallel solutions; taking "A and / or B" as an example, it includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0034] Signal transmission refers to the process of transmitting electromagnetic signals in an insulating medium. The dielectric constant of the insulating medium is one of the most critical parameters. The smaller the dielectric constant, the smaller the signal attenuation, the lower the transmission delay, and the better the signal fidelity and low latency during transmission.

[0035] Because air has the lowest dielectric constant, with a relative dielectric constant of 1, current technologies typically use low-dielectric polymers such as polypropylene (PP), polyethylene (PE), fluorinated ethylene propylene (FEP), and polytetrafluoroethylene (PTFE) to create microporous structures through internal foaming or stretching techniques. The air within these micropores lowers the overall dielectric constant, thereby improving the transmission performance of the wire. However, current processes for controlling the physical foaming degree of FEP are immature, resulting in low foaming stability and difficulties in adjusting the foaming process. Therefore, producing high-speed core wire products with superior performance is currently very challenging.

[0036] To address the aforementioned problems, the first aspect of this invention provides a signal transmission core wire 100, please refer to... Figure 1-3 It includes a conductor 110 and an insulating layer 130 covering the conductor 100, the insulating layer 130 being made of a material including silica 131 and fluororesin 132.

[0037] It is understood that the number of conductors 110 can be one, two, three, four, or even more. The embodiments of this application do not impose any special limitation on the number of conductors, as long as it can be applied to a signal transmission line.

[0038] In some embodiments of the present invention, the conductor 110 can be a single-strand wire or a multi-strand wire. The material of the conductor includes at least one of silver-plated copper, tin-plated copper, bare copper, tin-plated copper-clad steel, tin-plated copper-clad aluminum, silver-plated copper-clad steel, silver-plated copper-clad aluminum, and aluminum-magnesium alloy; in one embodiment, the material of the conductor is silver-plated copper, tin-plated copper, bare copper, tin-plated copper-clad steel, tin-plated copper-clad aluminum, silver-plated copper-clad steel, silver-plated copper-clad aluminum, or aluminum-magnesium alloy; the material of the conductor includes two of silver-plated copper, tin-plated copper, bare copper, tin-plated copper-clad steel, tin-plated copper-clad aluminum, silver-plated copper-clad steel, silver-plated copper-clad aluminum, and aluminum-magnesium alloy. Other embodiments follow the same principle and will not be described in detail.

[0039] In some embodiments of the present invention, the cross-sectional shape of the conductor includes a circle, an ellipse, and a kidney-shaped shape; a kidney-shaped shape, also known as a standard racetrack shape or a straight-sided ellipse, refers to a closed shape formed by dividing a circle into two semicircular arcs through the center and translating them in opposite directions, and connecting the endpoints of the two semicircular arcs with two parallel lines of equal length.

[0040] As is understood, materials made from silica and fluoropolymers refer to materials produced by melting and extruding silica and fluoropolymer granules, hereinafter referred to as signal transmission core wire insulation material. Of course, other components, such as compatibilizers or reinforcing agents, can be added during the melting and extrusion of silica and fluoropolymer granules; this is not limited here.

[0041] Silica is a general term for white, powdery, amorphous silica and silicate products that can be X-rayed. It is a porous material with small particle size and a large specific surface area. Due to the numerous pores within silica, it has a low dielectric constant. The small particle size of silica allows for good charge distribution on its surface, reducing the possibility of charge accumulation. The high specific surface area of ​​silica provides more interfacial energy, enhancing charge mobility and reducing energy loss in the medium. Silica can fill the gaps between the molecular chains of fluoropolymers, forming a three-dimensional network structure, restricting the thermal motion of the fluoropolymer molecular chains, thus improving the signal transmission and mechanical properties of the insulating material, and consequently improving the signal transmission and mechanical properties of the insulating layer.

[0042] Preferably, the specific surface area of ​​the silica is 100–400 m² / g, and the bulk density is 0.03–0.1 g / cm³. 3 .

[0043] Understandably, in order to be better applied in the field of signal transmission, the fluororesin is a meltable polytetrafluoroethylene or a copolymer of fluorinated ethylene propylene or a copolymer of meltable polytetrafluoroethylene and fluorinated ethylene propylene.

[0044] Understandably, melt-processable polytetrafluoroethylene (PFA) is a high-performance fluoroplastic that is copolymerized from tetrafluoroethylene (TFE) and a small amount of perfluoroalkoxy vinyl ether (such as PPVE). It combines the excellent properties of PTFE with the easy processability of thermoplastics. Fluorinated ethylene propylene copolymer (FEP), also known as perfluoroethylene propylene, commonly called F46, is a melt-processable fluoropolymer copolymerized from tetrafluoroethylene (TFE) and hexafluoropropylene (HFP).

[0045] In some embodiments of the present invention, the silica is fumed silica.

[0046] Fumed silica is synthesized directly into nanoscale particles by achieving instantaneous, large-scale, and uniform nucleation under ultra-high temperature, gaseous environment, and extremely short reaction time conditions, while strictly limiting subsequent growth processes. Compared with precipitated silica, fumed silica has higher purity, lower water content, larger specific surface area, and is more suitable for blending with fluoropolymers.

[0047] In some embodiments of the present invention, the fumed silica is fumed silica modified with a modifier.

[0048] Fumed silica has a large number of silanol groups on its surface. These polar silanol groups affect the dispersion uniformity and compatibility of fumed silica in fluororesin systems, thus impacting dielectric loss, mechanical properties, and flame retardant properties. To further improve the dispersion uniformity and compatibility of fumed silica in fluororesin systems, modifiers are used to modify the silica. Modifiers include organohalogenated silanes, silane coupling agents, fatty alcohols, silazanes, and siloxanes. Organohalogenated silanes include dimethyldichlorosilane and trimethylchlorosilane; silane coupling agents include hexamethyldisilazane, hexamethylethylsilazane, trimethylethoxysilane, and methyltrimethoxysilane; fatty alcohols include butanol, pentanol, and linear heptanol; silazanes include hexamethyldisilazane; and siloxanes include hexamethyldisilazane. The modifiers convert the hydroxyl groups on the surface of fumed silica into organic groups, thereby increasing the hydrophobicity of the fumed silica.

[0049] The present invention proposes an embodiment in which the material comprising silica and fluoropolymer is applied to the conductor by extrusion coating.

[0050] Understandably, the method for preparing the material, which includes silica and fluoropolymer, i.e., the signal transmission core wire insulation material, comprises the following steps:

[0051] The raw materials, including the silica and the fluororesin, are mixed evenly and then extruded, drawn into strips, and granulated using an extrusion device to obtain a signal transmission core wire insulation material.

[0052] In some embodiments of the present invention, the extrusion temperature of the extrusion equipment is 270-300°C and the screw speed is 60-120 rpm.

[0053] Understandably, an extrusion temperature of 270-300℃ ensures the rubber compound melts evenly and fully, increasing its fluidity and facilitating the complete integration of silica and fluororesin. A screw speed of 60-120 rpm ensures thorough and uniform mixing of the silica and fluororesin.

[0054] In some embodiments of the present invention, the mass ratio of the silica to the fluororesin is (0.5-50):100.

[0055] Preferably, the mass ratio of the silica to the fluororesin is (0.5-10):100.

[0056] Understandably, excessive silica content leads to predominantly polarized silica interfaces, drastically reducing the material's signal transmission performance, especially at high temperatures. It also excessively fills the gaps between fluoropolymer chains, restricting chain movement and causing the material to become brittle. Furthermore, it easily leads to agglomeration, forming localized hard spots and reducing material uniformity. Conversely, insufficient silica content fails to provide effective filling, failing to improve the material's signal transmission and mechanical properties, thus hindering the improvement of the insulation layer's signal transmission and mechanical properties.

[0057] The signal transmission core wire insulation material prepared above is used to coat the outside of the conductor by extrusion coating.

[0058] This invention proposes an embodiment in which, at 1MHz, the dielectric constant of the insulation material of the signal transmission core wire is 1.4-1.85, and the dielectric loss tangent is less than 2.5×10⁻⁶. -4 The insulation material of the signal transmission core wire has an elongation at break greater than 380% and a tensile strength greater than 24 MPa. The dielectric constant, dielectric loss, elongation at break, and tensile strength of the insulation layer are the same as the dielectric constant, dielectric loss, elongation at break, and tensile strength of the signal transmission core wire insulation material.

[0059] The present invention provides an embodiment, please refer to it. Figure 1-3 An inner skin layer 120 is provided between the conductor 110 and the insulating layer 130.

[0060] Understandably, the inner skin layer 120 can be a solid fluoropolymer material such as FEP or PFA, and this is not limited here. The inner skin layer 120 forms a dense barrier in advance to prevent the insulation layer 130 from being directly transmitted to the interface of the conductor 110 due to temperature changes or bending stress, thereby reducing the risk of cracking of the insulation layer 130. It can also further reduce signal transmission loss and improve data transmission rate and bandwidth.

[0061] The present invention provides an embodiment, please refer to it. Figure 1-3 The insulating layer 130 is covered with an outer skin layer 140.

[0062] Understandably, the outer skin 140 can be a solid fluoropolymer material such as FEP or PFA, or a foamed material such as polyethylene or polypropylene, or a silica or alumina aerogel material, or even a material made of silica and fluoropolymers; there are no limitations on this. The outer skin not only protects the internal insulation layer and conductor, but also further reduces signal transmission loss and improves data transmission rate and bandwidth.

[0063] A second aspect of the present invention provides a signal transmission core pair 200, please refer to... Figure 2 , Figure 3 This includes the aforementioned signal transmission core wire 100.

[0064] It is understandable that the signal transmission core pair 200 includes the aforementioned signal transmission core 100, and therefore has the same technical effect as the aforementioned signal transmission core 100, which will not be elaborated here.

[0065] The present invention provides an embodiment, please refer to it. Figure 1 , Figure 2 The signal transmission core wire 100 includes a conductor 110, an inner sheath 120 is provided between the conductor 110 and the insulation layer 130, and an outer sheath 140 is provided outside the insulation layer 130. The inner sheath 120, the insulation layer 130 and the outer sheath 140 are sequentially wrapped around the conductor 110.

[0066] The present invention provides an embodiment, please refer to it. Figure 2 The signal transmission core pair 200 includes a pair of signal transmission cores 100 as described above, and the pair of signal transmission cores 100 are covered with a sheath layer 210, and the sheath layer 210 is covered with a shielding protection layer 220.

[0067] Understandably, the sheath layer 210 can be a solid polymer such as polypropylene (PP) or polyethylene (PE), or a foamed material such as foamed PE, mainly serving as insulation protection for the internal signal transmission core wire 100.

[0068] Understandably, the shielding layer 220 includes a hot-melt self-adhesive aluminum foil layer, a hot-melt self-adhesive copper foil layer, a hot-melt self-adhesive silver-plated copper foil layer, an aluminum foil layer, a copper foil layer, a silver-plated copper foil layer, a metal plating layer, a copper wire braid layer, a tin-plated copper wire braid layer, or a silver-plated copper wire braid layer; or, the shielding layer 220 includes two or more of the following: a hot-melt self-adhesive aluminum foil layer, a hot-melt self-adhesive copper foil layer, a hot-melt self-adhesive silver-plated copper foil layer, an aluminum foil layer, a copper foil layer, a silver-plated copper foil layer, a metal plating layer, a copper wire braid layer, a tin-plated copper wire braid layer, or a silver-plated copper wire braid layer. The shielding layer 220 primarily serves as electromagnetic shielding and grounding protection.

[0069] The present invention provides an embodiment, please refer to it. Figure 2 The shielding protective layer 220 includes a shielding layer 221 and a wrapping layer 222. The shielding layer 221 covers the outer side of the sheath layer 210, and the wrapping layer 222 covers the outer side of the shielding layer 221.

[0070] Understandably, the shielding layer 221 includes a hot-melt self-adhesive aluminum foil layer, a hot-melt self-adhesive copper foil layer, a hot-melt self-adhesive silver-plated copper foil layer, an aluminum foil layer, a copper foil layer, a silver-plated copper foil layer, a metal plating layer, a copper wire braid layer, a tin-plated copper wire braid layer, or a silver-plated copper wire braid layer; or, the shielding layer 221 includes two or more of the following: a hot-melt self-adhesive aluminum foil layer, a hot-melt self-adhesive copper foil layer, a hot-melt self-adhesive silver-plated copper foil layer, an aluminum foil layer, a copper foil layer, a silver-plated copper foil layer, a metal plating layer, a copper wire braid layer, a tin-plated copper wire braid layer, or a silver-plated copper wire braid layer. The shielding layer 221 primarily serves as electromagnetic shielding and grounding protection.

[0071] Understandably, the wrapping tape layer 222 protects the integrity of the shielding layer 221 and securely fixes the shielding layer 221 to the surface of the sheath layer 210, preventing it from moving or wrinkling. The wrapping tape layer 222 can be polyester tape, polyvinyl chloride (PVC) tape, or non-woven fabric tape, etc., and is not limited here. The wrapping tape layer 222 can be one layer, two layers, or multiple layers, and is not limited here.

[0072] The present invention provides an embodiment, please refer to it. Figure 2 A ground wire 230 is provided between the sheath layer 210 and the shielding protection layer 220.

[0073] Understandably, the number of ground wires 230 can be one or two. One ground wire 230 can be positioned between a pair of signal transmission core wires 100. Two ground wires 230 can be arranged parallel to each other on either side of a pair of signal transmission core wires 100. The material of the ground wire 230 includes at least one of silver-plated copper, tin-plated copper, bare copper, tin-plated copper-clad steel, tin-plated copper-clad aluminum, silver-plated copper-clad steel, silver-plated copper-clad aluminum, and aluminum-magnesium alloy; the material of the ground wire 230 can be the same as or different from the material of the conductor 110. In one embodiment, the cross-sectional shape of the ground wire 230 includes circular, elliptical, and oval shapes; in one embodiment, the cross-sectional area of ​​the ground wire 230 is smaller than the cross-sectional area of ​​the conductor 110. Flexible design is possible according to actual needs.

[0074] The present invention provides an embodiment, please refer to it. Figure 3 The signal transmission core wire 100 includes two conductors 110, two inner sheaths 120, an insulating layer 130, and an outer sheath 140. The two conductors 110 are arranged in parallel, each conductor 110 is covered by an inner sheath 120, the insulating layer 130 covers each inner sheath 120, and an insulating layer 130 is covered by an outer sheath 140.

[0075] The present invention provides an embodiment, please refer to it. Figure 3 The signal transmission core wire 100 is covered with a shielding protective layer 220.

[0076] The present invention provides an embodiment, please refer to it. Figure 3 The shielding layer 220 includes a shielding layer 221 and a wrapping layer 222. The shielding layer 221 covers the outer skin layer 140, and the wrapping layer 222 covers the shielding layer 221.

[0077] Understandably, the shielding layer 221 includes a hot-melt self-adhesive aluminum foil layer, a hot-melt self-adhesive copper foil layer, a hot-melt self-adhesive silver-plated copper foil layer, an aluminum foil layer, a copper foil layer, a silver-plated copper foil layer, a metal plating layer, a copper wire braid layer, a tin-plated copper wire braid layer, or a silver-plated copper wire braid layer; or, the shielding layer 221 includes two or more of the following: a hot-melt self-adhesive aluminum foil layer, a hot-melt self-adhesive copper foil layer, a hot-melt self-adhesive silver-plated copper foil layer, an aluminum foil layer, a copper foil layer, a silver-plated copper foil layer, a metal plating layer, a copper wire braid layer, a tin-plated copper wire braid layer, or a silver-plated copper wire braid layer. The shielding layer 221 primarily serves as electromagnetic shielding and grounding protection.

[0078] Understandably, the wrapping tape layer 222 protects the integrity of the shielding layer 221 and securely fixes the shielding layer 221 to the surface of the sheath layer 210, preventing it from moving or wrinkling. The wrapping tape layer 222 can be polyester tape, polyvinyl chloride (PVC) tape, or non-woven fabric tape, etc., and is not limited here. The wrapping tape layer 222 can be one layer, two layers, or multiple layers, and is not limited here.

[0079] In one embodiment of the present invention, a ground wire 230 is provided between the signal transmission core wire 100 and the shielding protection layer 220.

[0080] Understandably, the number of ground wires 230 can be one or two. One ground wire 230 can be positioned in the middle of the signal transmission core wire 100. Two ground wires can be arranged parallel to each other on both sides of the signal transmission core wire 100. The material of the ground wire includes at least one of silver-plated copper, tin-plated copper, bare copper, tin-plated copper-clad steel, tin-plated copper-clad aluminum, silver-plated copper-clad steel, silver-plated copper-clad aluminum, and aluminum-magnesium alloy; the material of the ground wire 230 can be the same as or different from the material of the conductor 110. In one embodiment, the cross-sectional shape of the ground wire 230 includes circular, elliptical, and oval shapes; in one embodiment, the cross-sectional area of ​​the ground wire 230 is smaller than the cross-sectional area of ​​the conductor 110. Flexible design is possible according to actual needs.

[0081] Understandably, this invention provides a parallel dual-core structure and a dual-conductor single-core structure for signal transmission core pairs 200. The parallel dual-core structure is simple to manufacture and easy to maintain, but it is bulky; the dual-conductor single-core structure has a complex manufacturing process, but it is smaller and more compact.

[0082] The following specific embodiments and data explain the content of the present invention.

[0083] Example 1

[0084] The insulation material for signal transmission core wires, by mass ratio, includes the following components, as shown in Table 1:

[0085] ① Modified fumed silica: 5 parts, wherein the fumed silica is commercially available (Tokuyama, Japan, REOLOSIL QS102), and the modifier is dimethyldichlorosilane;

[0086] ② Fluorinated ethylene propylene copolymer FEP (Daikin, NP-3180): 100 parts;

[0087] The preparation process of the insulation material for the signal transmission core wire is as follows:

[0088] 1) The above-mentioned fluorinated ethylene propylene copolymer FEP (Daikin, NP-3180) was dried by drying the raw material at 80°C for 24 hours to ensure that the FEP compound does not contain moisture;

[0089] 2) Premix the dried modified fumed silica with FEP particles, set the speed to 850 rpm, and mix for 5-10 minutes to ensure that the modified fumed silica and FEP particles are mixed evenly. The mass ratio of modified fumed silica to FEP particles is 5:100.

[0090] 3) The mixed granules are melt-blended and granulated using a single-screw extruder. The extrusion temperature is 270-300℃ and the screw speed is 100rpm to obtain the signal transmission core wire insulation material.

[0091] The signal transmission core wire comprises a conductor, an inner sheath, an insulation layer, and an outer sheath, with the conductor sequentially covered by the inner sheath, insulation layer, and outer sheath. The conductor is silver-plated copper wire, and both the inner and outer sheaths are solid FEP (fiber emerald green) insulation. The insulation layer is made of the aforementioned signal transmission core wire insulation material.

[0092] The signal transmission core wire is prepared by a three-layer co-extrusion method, as follows:

[0093] 1) Conductor preparation: Annealed silver-plated copper wire.

[0094] 2) Rubber compound treatment: Inner skin layer / outer skin layer rubber compound: solid FEP granules (Daikin NP3180 from Japan), vacuum dried at 80℃ for 4 hours;

[0095] 3) Three-layer co-extrusion:

[0096] The inner sheath material, signal transmission core wire insulation material, and outer sheath material are placed into different screws in a three-head co-extrusion extruder. The first unit extrudes the inner sheath FEP at a set extrusion temperature of 340°C and a screw speed of 32 rpm. The second unit extrudes the signal transmission core wire insulation material at a set extrusion temperature of 350°C and a screw speed of 34 rpm. The third unit extrudes the outer sheath FEP at a set extrusion temperature of 370°C and a screw speed of 38 rpm. The inner sheath, insulation layer, and outer sheath are extruded onto the conductor surface in the order of inner sheath, insulation layer, and outer sheath. After cooling and drying, the signal transmission core wire is obtained with a wire diameter of 0.71 mm ± 0.01 mm.

[0097] A horizontal wrapping machine is used to form signal transmission core wire pairs. Each signal transmission core wire pair consists of two parallel signal transmission core wires, both of which are covered with a shielding layer. A ground wire is then placed on the side of the two signal transmission core wires that is furthest from each other. Finally, a wrapping layer is applied, with the shielding layer being composite aluminum foil (aluminum side facing out) and the wrapping layer being hot-melt PET. The ground wire is a 0.2mm silver-plated copper conductor.

[0098] Example 2

[0099] The insulation material for signal transmission core wires, by mass ratio, includes the following components, as shown in Table 1:

[0100] ① Modified fumed silica: 0.5 parts, wherein the fumed silica is commercially available (Tokuyama, Japan, REOLOSIL QS102), and the modifier is dimethyldichlorosilane;

[0101] ② Fluorinated ethylene propylene copolymer FEP (Daikin, NP-3180): 100 parts.

[0102] The preparation process of the insulation material for the signal transmission core wire is as follows:

[0103] 1) The above-mentioned fluorinated ethylene propylene copolymer FEP (Daikin, NP-3180) was dried by drying the raw material at 80°C for 24 hours to ensure that the FEP compound does not contain moisture;

[0104] 2) Premix the dried modified fumed silica with FEP particles, set the speed to 850 rpm, and mix for 5-10 minutes to ensure that the modified fumed silica and FEP particles are mixed evenly. The mass ratio of modified fumed silica to FEP particles is 0.5:100.

[0105] 3) The mixed granules are melt-blended and granulated using a single-screw extruder. The extrusion temperature is 270-300℃ and the screw speed is 100rpm to obtain the signal transmission core wire insulation material.

[0106] The structure and preparation method of the signal transmission core wire are similar to those in Example 1, except that the insulation material formulation of the signal transmission core wire is different.

[0107] The structure of the signal transmission core pair is similar to that of Example 1, except that the insulation material formula of the signal transmission core pair is different.

[0108] Example 3

[0109] The insulation material for signal transmission core wires, by mass ratio, includes the following components, as shown in Table 1:

[0110] ① Modified fumed silica: 10 parts, wherein the fumed silica is commercially available (Tokuyama, Japan, REOLOSIL QS102), and the modifier is dimethyldichlorosilane;

[0111] ② Fluorinated ethylene propylene copolymer FEP (Daikin, NP-3180): 100 parts.

[0112] The preparation process of the insulation material for the signal transmission core wire is as follows:

[0113] 1) The above-mentioned fluorinated ethylene propylene copolymer FEP (Daikin, NP-3180) was dried by drying the raw material at 80°C for 24 hours to ensure that the FEP compound does not contain moisture;

[0114] 2) Premix the dried modified fumed silica with FEP particles, set the speed to 850 rpm, and mix for 5-10 minutes to ensure that the modified fumed silica and FEP particles are mixed evenly. The mass ratio of modified fumed silica to FEP particles is 10:100.

[0115] 3) The mixed granules are melt-blended and granulated using a single-screw extruder. The extrusion temperature is 270-300℃ and the screw speed is 100rpm to obtain the signal transmission core wire insulation material.

[0116] The structure and preparation method of the signal transmission core wire are similar to those in Example 1, except that the insulation material formulation of the signal transmission core wire is different.

[0117] The structure of the signal transmission core pair is similar to that of Example 1, except that the insulation material formula of the signal transmission core pair is different.

[0118] Example 4

[0119] The insulation material for signal transmission core wires, by mass ratio, includes the following components, as shown in Table 1:

[0120] ① Modified fumed silica: 5 parts, wherein the fumed silica is commercially available (Tokuyama, Japan, REOLOSIL QS102), and the modifier is dimethyldichlorosilane;

[0121] ② Fusible polytetrafluoroethylene (DuPont, 951HP PLUS): 100 parts.

[0122] The preparation process of the insulation material for the signal transmission core wire is as follows:

[0123] 1) The above-mentioned fusible polytetrafluoroethylene (DuPont, 951HP PLUS) is dried. The raw material is dried at 80°C for 24 hours to ensure that the fusible polytetrafluoroethylene compound does not contain moisture.

[0124] 2) Premix the dried modified fumed silica with fusible polytetrafluoroethylene particles. Set the speed to 850 rpm and mix for 5-10 minutes to ensure that the modified fumed silica and fusible polytetrafluoroethylene particles are mixed evenly. The mass ratio of modified fumed silica to fusible polytetrafluoroethylene particles is 5:100.

[0125] 3) The mixed granules are melt-blended and granulated using a single-screw extruder. The extrusion temperature is 270-300℃ and the screw speed is 100rpm to obtain the signal transmission core wire insulation material.

[0126] The structure and preparation method of the signal transmission core wire are similar to those in Example 1, except that the insulation material formulation of the signal transmission core wire is different.

[0127] The structure of the signal transmission core pair is similar to that of Example 1, except that the insulation material formula of the signal transmission core pair is different.

[0128] Comparative Example 1

[0129] This comparative example is similar to Example 1, except that the fumed silica was obtained commercially (Tokuyama, Japan, REOLOSILQS102) and was not modified, see Table 1.

[0130] The preparation process of the insulation material for the signal transmission core wire is as follows:

[0131] 1) The above-mentioned fluorinated ethylene propylene copolymer FEP (Daikin, NP-3180) was dried by drying the raw material at 80°C for 24 hours to ensure that the FEP compound does not contain moisture;

[0132] 2) Premix the dried fumed silica with FEP particles at a speed of 850 rpm for 5-10 minutes to ensure uniform mixing of fumed silica and FEP particles. The mass ratio of fumed silica to FEP particles is 5:100.

[0133] 3) The mixed granules are melt-blended and granulated using a single-screw extruder. The extrusion temperature is 270-300℃ and the screw speed is 100rpm to obtain the signal transmission core wire insulation material.

[0134] The structure and preparation method of the signal transmission core wire are similar to those in Example 1, except that the insulation material formulation of the signal transmission core wire is different.

[0135] The structure of the signal transmission core pair is similar to that of Example 1, except that the insulation material formula of the signal transmission core pair is different.

[0136] Comparative Example 2

[0137] This comparative example is similar to Example 1, except that polyethylene (Sinopec, QHM22F) is used instead of FEP in the preparation of the signal transmission core wire insulation material, see Table 1.

[0138] The preparation process of the insulation material for the signal transmission core wire is as follows:

[0139] 1) The above-mentioned polyethylene (Sinopec, QHM22F) was dried at 60°C for 24 hours to ensure that the PE compound contained no moisture.

[0140] 2) The dried modified fumed silica from Example 1 is premixed with PE particles. The speed is set to 850 rpm and the mixture is mixed for 5-10 minutes to ensure that the modified fumed silica and PE particles are mixed evenly. The mass ratio of modified fumed silica to PE particles is 5:100.

[0141] 3) The mixed granules are melt-blended and granulated using a single-screw extruder. The extrusion temperature is 180-230℃ and the screw speed is 100rpm to obtain the signal transmission core wire insulation material.

[0142] The structure and preparation method of the signal transmission core wire are similar to those in Example 1, except that the insulation material formulation of the signal transmission core wire is different.

[0143] The structure of the signal transmission core pair is similar to that of Example 1, except that the insulation material formula of the signal transmission core pair is different.

[0144] Comparative Example 3

[0145] This comparative example is similar to Example 1, except that the signal transmission core wire insulation material used is fluorinated ethylene propylene copolymer FEP (Daikin, NP-3180) as a comparison, and it is not blended with modified fumed silica, see Table 1.

[0146] The structure and preparation method of the signal transmission core wire are similar to those in Example 1, except that the insulation material formulation of the signal transmission core wire is different.

[0147] The structure of the signal transmission core pair is similar to that of Example 1, except that the insulation material formula of the signal transmission core pair is different.

[0148] Comparative Example 4

[0149] The insulation material for signal transmission core wires, by mass ratio, includes the following components, as shown in Table 1:

[0150] ① Modified fumed silica: 0.3 parts, wherein the fumed silica is commercially available (Tokuyama, Japan, REOLOSIL QS102), and the modifier is dimethyldichlorosilane;

[0151] ② Fluorinated ethylene propylene copolymer FEP (Daikin, NP-3180): 100 parts.

[0152] The preparation process of the insulation material for the signal transmission core wire is as follows:

[0153] 1) The above-mentioned fluorinated ethylene propylene copolymer FEP (Daikin, NP-3180) was dried by drying the raw material at 80°C for 24 hours to ensure that the FEP compound does not contain moisture;

[0154] 2) Premix the dried modified fumed silica with FEP particles, set the speed to 850 rpm, and mix for 5-10 minutes to ensure that the modified fumed silica and FEP particles are mixed evenly. The mass ratio of modified fumed silica to FEP particles is 0.3:100.

[0155] 3) The mixed granules are melt-blended and granulated using a single-screw extruder. The extrusion temperature is 270-300℃ and the screw speed is 100rpm to obtain the signal transmission core wire insulation material.

[0156] The structure and preparation method of the signal transmission core wire are similar to those in Example 1, except that the insulation material of the signal transmission core wire is different.

[0157] The structure of the signal transmission core pair is similar to that of Example 1, except that the insulation material formula of the signal transmission core pair is different.

[0158] Comparative Example 5

[0159] The insulation material for signal transmission core wires, by mass ratio, includes the following components, as shown in Table 1:

[0160] ① Modified fumed silica: 15 parts, wherein the fumed silica is commercially available (Tokuyama, Japan, REOLOSIL QS102), and the modifier is dimethyldichlorosilane;

[0161] ② Fluorinated ethylene propylene copolymer FEP (Daikin, NP-3180): 100 parts.

[0162] The preparation process of the insulation material for the signal transmission core wire is as follows:

[0163] 1) The above-mentioned fluorinated ethylene propylene copolymer FEP (Daikin, NP-3180) was dried by drying the raw material at 80°C for 24 hours to ensure that the FEP compound does not contain moisture;

[0164] 2) Premix the dried modified fumed silica with FEP particles, set the speed to 850 rpm, and mix for 5-10 minutes to ensure that the modified fumed silica and FEP particles are mixed evenly. The mass ratio of modified fumed silica to FEP particles is 15:100.

[0165] 3) The mixed granules are melt-blended and granulated using a single-screw extruder. The extrusion temperature is 270-300℃ and the screw speed is 100rpm to obtain the signal transmission core wire insulation material.

[0166] The structure and preparation method of the signal transmission core wire are similar to those in Example 1, except that the insulation material of the signal transmission core wire is different.

[0167] The structure of the signal transmission core pair is similar to that of Example 1, except that the insulation material formula of the signal transmission core pair is different.

[0168] Comparative Example 6

[0169] The insulation material for signal transmission core wires, by mass ratio, includes the following components, as shown in Table 1:

[0170] ① Modified precipitated silica: 5 parts, wherein the precipitated silica is commercially available (Henan Haiborui, H-688), and the modifier is dimethyldichlorosilane;

[0171] ② Fluorinated ethylene propylene copolymer FEP (Daikin, NP-3180): 100 parts.

[0172] The preparation process of the insulation material for the signal transmission core wire is as follows:

[0173] 1) The above-mentioned fluorinated ethylene propylene copolymer FEP (Daikin, NP-3180) was dried by drying the raw material at 80°C for 24 hours to ensure that the FEP compound does not contain moisture;

[0174] 2) Premix the dried modified precipitated silica with FEP particles, set the speed to 850 rpm, and mix for 5-10 minutes to ensure that the modified precipitated silica and FEP particles are mixed evenly. The mass ratio of modified precipitated silica to FEP particles is 5:100.

[0175] 3) The mixed granules are melt-blended and granulated using a single-screw extruder. The extrusion temperature is 270-300℃ and the screw speed is 100rpm to obtain the signal transmission core wire insulation material.

[0176] The structure and preparation method of the signal transmission core wire are similar to those in Example 1, except that the insulation material of the signal transmission core wire is different.

[0177] The structure of the signal transmission core pair is similar to that of Example 1, except that the insulation material formula of the signal transmission core pair is different.

[0178] The signal transmission core wire insulation materials prepared in the above embodiments and comparative examples were injection molded, and the dielectric loss tangent, elongation at break, tensile strength, and flame retardancy rating were measured. The characteristic impedance, attenuation, and delay of the signal transmission core wire pairs prepared in the above embodiments and comparative examples were measured. The test standards are as follows:

[0179] (1) Dielectric constant

[0180] The product is tested according to the International Electrotechnical Commission standard IEC 60250. Based on the capacitance formula of parallel plate capacitors, the dielectric constant is inferred by measuring the capacitance value of the sample as the dielectric.

[0181] Formula: Capacitance of a parallel capacitor

[0182] Where C is the capacitance (F) and A is the electrode area (m²). 2 ), where d is the sample thickness (m).

[0183] The test logic clamps the sample between two parallel metal electrodes to form a capacitor, and uses an LCR meter (QS37a - Yangzhou Subo Electric Co., Ltd.) to measure the capacitance C, then substitutes the values ​​into the formula to calculate... Where ε0 is the vacuum permittivity. Each sample was measured three times, and the average value was taken.

[0184] (2) Dielectric loss tangent

[0185] According to the International Electrotechnical Commission standard IEC 60250, the capacitance (C) and equivalent series resistance (Rs) of a sample are measured using C and Rs. sCalculate the loss tangent. In a parallel-plate capacitor, the dielectric loss of the sample manifests as the "equivalent resistance" of the capacitor. Using an LCR meter (QS37a - Yangzhou Subo Electric Co., Ltd.), the capacitance C and loss resistance Rs of the sample are measured, and the loss tangent can be calculated using a formula.

[0186] Calculation formula: Where f is the test frequency. Each sample is measured three times, and the average value is taken.

[0187] (3) Elongation at break and tensile strength

[0188] The test was conducted according to Clause 9 of GB 1040—2008, with a test temperature of 23±2℃. The tensile test used a standard dumbbell-shaped specimen with a tensile speed of 250 mm / min. The tensile strength and elongation at break of five specimens were tested using a micro-controlled electronic universal tensile testing machine from Dongguan High-Speed ​​Railway Testing Co., Ltd., and the average value of the results was taken.

[0189] (4) Characteristic impedance, attenuation, and delay

[0190] The following test conditions were used: the sampling test length was 3 meters, the test was conducted using a network analyzer (E5071B Agilent), and the test termination frequency was 40 GHz.

[0191] The test results are detailed in Table 2.

[0192] Table 1 Preparation conditions of embodiments and comparative examples of the present invention

[0193]

[0194]

[0195] Table 2 Performance Test Table of Embodiments and Comparative Examples of the Invention

[0196]

[0197] As shown in Tables 1 and 2, in Examples 1-4, the dielectric constant of the signal transmission core wire insulation material is 1.4-1.85 at 1MHz, and the dielectric loss tangent is less than 2.5 × 10⁻⁶. -4 This indicates that the signal transmission core wire insulation material of the present invention has excellent signal transmission performance; the elongation at break is greater than 380%, ranging from 388% to 450%, and the tensile strength is greater than 24 MPa, ranging from 24.6% to 27.8 MPa, indicating that the signal transmission core wire insulation material of the present invention has good mechanical properties. Signal transmission core wire pairs made from this insulation material exhibit attenuation of 6.85–7.10 dB / m and delay of 4.07–4.66 ns / m at 10 GHz, demonstrating low attenuation and good signal integrity.

[0198] Compared to Example 1, Comparative Example 1 used unmodified fumed silica, and the dielectric constant of the signal transmission core wire insulation was 2.52, and the dielectric loss was 4.13 × 10⁻⁶. -4 The dielectric constant increased by 55.6%, and the dielectric loss increased by 144.4%, indicating a significant decrease in the signal transmission performance of the core wire insulation material in Comparative Example 1. Comparative Example 1 had a breaking elongation of 253% and a tensile strength of 24.2 MPa, with a decrease in breaking elongation of 43.8% and tensile strength of 12.9%, indicating a decline in mechanical properties. The signal transmission core wire pair made from the signal transmission core wire insulation material of Comparative Example 1 exhibited an attenuation of 7.82 dB / m and a delay of 5.51 ns / m at 10 GHz. The reduced attenuation level and deteriorated signal integrity indicate that the modified fumed silica of this invention has superior signal transmission and mechanical properties compared to the unmodified fumed silica. The modified fumed silica exhibits better compatibility with fluoropolymers than the unmodified fumed silica, preventing phase separation and improving the signal transmission and mechanical properties of the insulation material. It is evident that, compared to unmodified fumed silica and fluororesin blends, the signal transmission performance and mechanical properties of the signal transmission core wire insulation material are significantly improved when using modified fumed silica and fluororesin blends.

[0199] In Comparative Example 2, the signal transmission core wire insulation material made of polyethylene and modified fumed silica has a dielectric constant of 2.23 and a dielectric loss of 3.87 × 10⁻⁶. -4 The dielectric constant of pure polyethylene is 2.35, and the dielectric loss is 4.01 × 10⁻⁶. -4 Compared to the previous method, the dielectric constant decreased by 5.1% and the dielectric loss decreased by 3.5%. In Example 1, the dielectric constant was 1.62 and the dielectric loss was 1.69 × 10⁻⁶. -4 Compared to the pure FEP resin in Comparative Example 3, the dielectric constant is 2.1 and the dielectric loss is 2.0 × 10⁻⁶. -4Compared to pure polyethylene, the dielectric constant decreased by 22.9% and the dielectric loss decreased by 15.5%. The reduction in dielectric constant between fluoropolymer and modified fumed silica blends was greater than that between pure polyethylene and modified fumed silica. Fluoropolymer substrates are more suitable for compounding with modified fumed silica to improve the signal transmission performance of insulation materials. Pure polyethylene has an elongation at break of 713% and a tensile strength of 20.2 MPa. In Comparative Example 2, the insulation material prepared by blending polyethylene with 5% modified fumed silica by mass had an elongation at break of 689% and a tensile strength of 18.2 MPa. Compared with pure polyethylene, the elongation at break decreased by 3.4% and the tensile strength decreased by 9.9%. In Example 1, the insulation material prepared by blending FEP with 5% modified fumed silica by mass had an elongation at break of 450% and a tensile strength of 27.8 MPa. Compared with pure FEP in Comparative Example 3, the elongation at break increased by 28.6% and the tensile strength increased by 19.8%, indicating that the mechanical properties of polyethylene decreased after adding 5% modified fumed silica by mass, while the mechanical properties of fluoropolymers improved after adding 5% modified fumed silica by mass. This suggests that fluoropolymer substrates are more suitable for compounding with modified fumed silica to improve the mechanical properties of insulation materials. The signal transmission core wire pair prepared from the signal transmission core wire insulation material of Comparative Example 2 showed an attenuation of 7.37 dB / m and a delay of 5.01 ns / m at 10 GHz, indicating a decrease in attenuation level and a deterioration in signal integrity. Therefore, in terms of signal transmission performance, compared with polyethylene and modified fumed silica blends, the reduction in signal transmission performance of fluoropolymer and modified fumed silica blends compared with pure fluoropolymer is greater than that of polyethylene and modified fumed silica blends compared with pure polyethylene. In terms of mechanical properties, fluoropolymer and modified fumed silica blends show improved performance compared with pure fluoropolymer, while the mechanical properties of polyethylene and modified fumed silica blends decrease compared with pure polyethylene. This indicates that fluoropolymer substrates are more suitable for compounding with modified fumed silica to improve the signal transmission performance and mechanical properties of insulating materials.

[0200] Compared to Example 1, Comparative Example 3 only used fluorinated ethylene propylene copolymer (FEP) to make the signal transmission core wire insulation material, with a dielectric constant of 2.1 and a dielectric loss of 2.0 × 10⁻⁶. -4The dielectric constant increased by 29.6%, and the dielectric loss increased by 18.3%, indicating that the signal transmission performance of the core wire insulation material in Comparative Example 3 was reduced. The signal transmission core wire pair made from the signal transmission core wire insulation material of Comparative Example 3 exhibited an attenuation of 7.16 dB / m and a delay of 4.69 ns / m at 10 GHz, indicating a decrease in attenuation and a deterioration in signal integrity. Comparative Example 3 had an elongation at break of 350% and a tensile strength of 23.2 MPa, representing a decrease in elongation at break of 22.2% and a decrease in tensile strength of 16.5%, indicating an improvement in the mechanical properties of Example 1. Therefore, it is evident that using a blend of fluororesin and modified fumed silica improves both the signal transmission performance and mechanical properties of the insulation material compared to pure fluororesin.

[0201] Compared with Example 1, Comparative Example 4 reduced the mass ratio of modified fumed silica to FEP particles, resulting in a dielectric constant of 2.08 and a dielectric loss tangent of 2.23 × 10⁻⁶. -4 The dielectric constant increased by 28.4%, and the dielectric loss increased by 32.0%, indicating that the signal transmission performance of the core wire insulation material in Comparative Example 4 was reduced. The elongation at break was 355%, and the tensile strength was 23.5 MPa, representing a decrease in elongation at break of 21.1% and a decrease in tensile strength of 15.5%. The signal transmission core wire pair made from the signal transmission core wire insulation material of Comparative Example 4 exhibited an attenuation of 7.26 dB / m and a delay of 4.89 ns / m at 10 GHz, indicating a decrease in attenuation and a deterioration in signal integrity. Therefore, it is evident that blends with a modified fumed silica to fluoropolymer mass ratio less than 0.5 exhibit reduced signal transmission performance and mechanical properties compared to blends with a mass ratio between 0.5 and 10.

[0202] Compared with Example 1, Comparative Example 5 increased the mass ratio of modified fumed silica to FEP particles, resulting in a dielectric constant of 2.8 and a dielectric loss tangent of 5.10 × 10⁻⁶. -4 The dielectric constant increased by 72.8%, and the dielectric loss increased by 201.8%, indicating a significant decrease in signal transmission performance of the core wire insulation material in Comparative Example 5. The elongation at break was 173%, and the tensile strength was 20.1 MPa, representing a decrease in elongation at break of 61.6% and tensile strength of 27.7%. The signal transmission core wire pair made from the insulation material of Comparative Example 5 exhibited an attenuation of 6.99 dB / m and a delay of 4.47 ns / m at 10 GHz, indicating a decrease in attenuation and a deterioration in signal integrity. Therefore, it is evident that blends with a modified fumed silica to fluoropolymer mass ratio greater than 10 exhibit significantly lower signal transmission performance and mechanical properties compared to blends with a mass ratio between 0.5 and 10.

[0203] Compared to Example 1, Comparative Example 6 uses a blend of modified precipitated silica and fluoropolymer, resulting in a dielectric constant of 2.4 and a dielectric loss of 4.62 × 10⁻⁶ for the signal transmission core wire insulation. -4The dielectric constant increased by 48.1%, and the dielectric loss increased by 173.3%, indicating a significant decrease in the signal transmission performance of the core wire insulation material in Comparative Example 6. Comparative Example 6 had a breaking elongation of 379% and a tensile strength of 25.2 MPa, with a decrease in breaking elongation of 15.8% and tensile strength of 9.4%, indicating a decline in mechanical properties. The signal transmission core wire pair made from the signal transmission core wire insulation material of Comparative Example 6 exhibited an attenuation of 7.15 dB / m and a delay of 4.86 ns / m at 10 GHz. The decreased attenuation level and deteriorated signal integrity indicate that the signal transmission performance and mechanical properties of the modified fumed silica of this invention are superior to those of the modified precipitated silica. Therefore, compared to the modified precipitated silica and fluororesin blend, the signal transmission core wire insulation material using the modified fumed silica and fluororesin blend exhibits improved signal transmission performance and mechanical properties.

[0204] As can be seen from Examples 1-4 and Comparative Examples 1-6 above, when the mass ratio of modified fumed silica to fluororesin is between 0.5 and 10, the modified fumed silica and fluororesin form a synergistic effect, and the material formed by the two has better signal transmission performance and mechanical properties.

[0205] Therefore, it can be seen that when the mass ratio of modified fumed silica to fluororesin is between 0.5 and 10, the insulating layer prepared by the present invention, which is made of modified fumed silica and fluororesin, forms a synergistic effect. The insulating layer made of the material formed by the two improves the signal transmission performance and mechanical properties of the signal transmission core pair.

[0206] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0207] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A signal transmission core wire, characterized in that, It includes a conductor and an insulating layer covering the conductor, the insulating layer being made of a material including silica and fluoropolymer.

2. The signal transmission core wire as described in claim 1, characterized in that, The material, comprising silica and fluoropolymer, is extruded and coated onto the conductor.

3. The signal transmission core wire insulation material as described in claim 1, characterized in that, The silica is fumed silica.

4. The signal transmission core wire insulation material as described in claim 3, characterized in that, The fumed silica is fumed silica modified with a modifier.

5. The signal transmission core wire insulation material as described in claim 1, characterized in that, The fluororesin is a meltable polytetrafluoroethylene or a fluorinated ethylene propylene copolymer, or a meltable polytetrafluoroethylene and a fluorinated ethylene propylene copolymer.

6. The signal transmission core wire insulation material as described in claim 1, characterized in that, The mass ratio of the silica to the fluororesin is (0.5-50):

100.

7. The signal transmission core wire insulation material as described in claim 6, characterized in that, The mass ratio of the silica to the fluororesin is (0.5-10):

100.

8. The signal transmission core wire as described in claim 1, characterized in that, An inner skin layer is provided between the conductor and the insulating layer.

9. The signal transmission core wire as described in claim 1, characterized in that, The insulating layer is covered with an outer skin layer.

10. A signal transmission core pair, characterized in that, Includes the signal transmission core wire as described in claim 1.

11. The signal transmission core pair as described in claim 10, characterized in that, The signal transmission core wire includes a conductor, an inner sheath layer between the conductor and the insulation layer, and an outer sheath layer outside the insulation layer. The inner sheath layer, the insulation layer, and the outer sheath layer sequentially cover the conductor.

12. The signal transmission core pair as described in claim 11, characterized in that, The signal transmission core pair includes a pair of signal transmission cores, the pair of signal transmission cores are covered with a sheath layer, and the sheath layer is covered with a shielding protective layer.

13. The signal transmission core pair as described in claim 12, characterized in that, The shielding protection layer includes a shielding layer and a wrapping layer. The shielding layer covers the outer sheath layer, and the wrapping layer covers the outer shielding layer.

14. The signal transmission core pair as described in claim 12, characterized in that, A ground wire is provided between the sheath layer and the shielding protection layer.

15. The signal transmission core pair as described in claim 10, characterized in that, The signal transmission core wire includes two conductors, two inner sheaths, an insulating layer, and an outer sheath. The two conductors are arranged in parallel, each conductor is covered by an inner sheath, the insulating layer covers the two inner sheaths, and the insulating layer is covered by an outer sheath.

16. The signal transmission core pair as described in claim 15, characterized in that, The signal transmission core is covered with a shielding protective layer.

17. The signal transmission line as described in claim 16, characterized in that, The shielding protection layer includes a shielding layer and a wrapping layer. The shielding layer covers the outer skin layer, and the wrapping layer covers the shielding layer.

18. The signal transmission core pair as described in claim 16, characterized in that, A ground wire is provided between the signal transmission core wire and the shielding protection layer.

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