Signal transmission core wire insulation material, preparation method thereof and signal transmission core wire

Abstract

The invention discloses a signal transmission core wire insulation material which comprises white carbon black and fluororesin. The white carbon black can be filled in molecular chain gaps of the fluororesin to form a three-dimensional network structure to limit thermal motion of molecular chains of the fluororesin, so that the signal transmission performance of the insulating material is improved, and the mechanical property of the fluororesin is further improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of signal transmission, in particular to a signal transmission core wire insulation material. BACKGROUND

[0002] At present, high-speed communication line products are in the stage of continuous development, and the signal transmission capability of high-speed communication lines is a representative parameter of technology upgrading. The core wire is an important component of high-speed line products, and the properties of the insulation material of the core wire determine the upper limit of the signal transmission capability of the high-speed line products to a certain extent. The speed, frequency and stability of signal transmission are affected by the insulation material of the core wire, and the insulation material usually needs to have a lower dielectric constant and a smaller dielectric loss tangent. The improvement of the signal transmission requirement of high-speed communication lines means the improvement of the performance of the core wire insulation material, which needs to further reduce the signal transmission loss and improve the data transmission rate and bandwidth, while meeting the better mechanical properties. SUMMARY

[0003] In view of the above deficiencies of the prior art, the present application provides a signal transmission core wire insulation material, which aims to improve the performance of the current signal transmission core wire insulation material, to improve the signal transmission performance of the insulation material, and to further improve the mechanical properties of the fluororesin.

[0004] The above-mentioned object of the present application is realized by the following technical solutions:

[0005] In a first aspect of the present application, a signal transmission core wire insulation material is provided, comprising white carbon black and fluororesin.

[0006] In some embodiments of the present application, the dielectric constant of the signal transmission core wire insulation material is 1.4-1.85 and the dielectric loss tangent is less than 2.5x10 -4 at 1MHz, the elongation at break of the signal transmission core wire insulation material is greater than 380%, and the tensile strength is greater than 24Mpa.

[0007] In some embodiments of the present application, the fluororesin is meltable polytetrafluoroethylene or fluorinated ethylene propylene copolymer or meltable polytetrafluoroethylene and fluorinated ethylene propylene copolymer.

[0008] In some embodiments of the present application, the white carbon black is fumed white carbon black.

[0009] In some embodiments of the present application, the fumed white carbon black is fumed white carbon black modified by a modifier.

[0010] In some embodiments of the present application, the mass ratio of the white carbon black to the fluororesin is (0.5-50):100.

[0011] In some embodiments of the present application, the mass ratio of the white carbon black and the fluororesin is (0.5-10):100.

[0012] In the second aspect of the present application, a preparation method of the signal transmission core wire insulating material is provided, and the preparation method comprises the following steps:

[0013] The raw materials are mixed uniformly, the raw materials comprising the white carbon black and the fluororesin, and then the signal transmission core wire insulating material is obtained through extrusion by an extrusion device, drawing, and granulation.

[0014] In some embodiments of the present application, the extrusion temperature of the extrusion device is 270-300℃, and the screw rotation speed is 60-120rpm.

[0015] In the third aspect of the present application, a signal transmission core wire is provided, comprising a conductor and an insulating layer wrapped outside the conductor, and the insulating layer is prepared by using the signal transmission core wire insulating material.

[0016] The signal transmission core wire insulating material comprises white carbon black and fluororesin. The white carbon black can fill the molecular chain gap of the fluororesin, form a three-dimensional network structure, limit the thermal motion of the fluororesin molecular chain, thereby improving the signal transmission performance of the insulating material, and further improving the mechanical properties of the fluororesin. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme of the embodiments of the present application will be described clearly and completely below. It should be understood that the following embodiments are only used to explain the present application, and are not used to limit the present application.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the claimed subject matter belongs.

[0019] Currently, high-speed communication line products are in the stage of continuous development, and the signal transmission capability of high-speed communication lines is a representative parameter of technology upgrading. The core wire is an important component of high-speed line products, and the properties of the insulating material of the core wire determine the upper limit of the signal transmission capability of the high-speed line product to a certain extent. The speed, frequency and stability of signal transmission are affected by the insulating material of the core wire, and the insulating material usually needs to have a lower dielectric constant and a smaller dielectric loss tangent. The dielectric constant of common insulating materials such as polyethylene (PE) and polypropylene (PP) is about 2.2-2.4, and the dielectric constant of fluororesin such as fluorinated ethylene propylene copolymer (FEP) is about 2.0-2.1. Therefore, in higher-end signal transmission lines, fluororesin is usually used as the insulating material of the cable. The white carbon black can fill the gap between the molecular chains of the fluororesin, form a three-dimensional network structure, limit the thermal motion of the molecular chains of the fluororesin, thereby reducing the signal transmission loss and improving the data transmission rate and bandwidth, and further improving the mechanical properties of the fluororesin.

[0020] To solve the above problems, the first aspect of the present application provides a signal transmission core wire insulating material, which comprises white carbon black and fluororesin.

[0021] White carbon black is a general term for white powder X-ray amorphous silicic acid and silicate products, and is a porous substance with small particle size and large specific surface area. Due to the existence of many pores in the white carbon black, the dielectric constant is low. Due to the small particle size of the white carbon black, the electric charge is well distributed on its surface, reducing the possibility of charge accumulation. The high specific surface area of white carbon black can provide more interfacial energy, enhance the movement performance of electric charge, and reduce the energy loss in the medium. The white carbon black can fill the gap between the molecular chains of the fluororesin, form a three-dimensional network structure, limit the thermal motion of the molecular chains of the fluororesin, thereby improve the signal transmission performance of the insulating material, and further improve the mechanical properties of the fluororesin.

[0022] Preferably, the specific surface area of the white carbon black is 100-400 m2 / g, and the bulk density is 0.03-0.1 g / cm 3 .

[0023] In some embodiments of the present application, the dielectric constant of the signal transmission core wire insulating material is 1.4-1.85, and the dielectric loss tangent is less than 2.5x10 -4 -3 at 1 MHz, the elongation at break of the signal transmission core wire insulating material is greater than 380%, and the tensile strength is greater than 24 MPa.

[0024] In some embodiments of the present application, the fluororesin is fusible polytetrafluoroethylene or fluorinated ethylene propylene copolymer or fusible polytetrafluoroethylene and fluorinated ethylene propylene copolymer.

[0025] It can be understood that the fusible polytetrafluoroethylene (PFA, Perfluoroalkoxy) is a melt processable high performance fluoroplastic, which is copolymerized from tetrafluoroethylene (TFE) and a small amount of perfluoroalkoxy vinyl ether (such as PPVE), and has excellent performance of polytetrafluoroethylene (PTFE) and easy processability of thermoplastic. Fluorinated ethylene propylene (FEP, Fluorinated Ethylene Propylene), also known as polyperfluoroethylene propylene, commonly known as F46, is a melt processable fluoropolymer copolymerized from tetrafluoroethylene (TFE) and hexafluoropropylene (HFP).

[0026] In some embodiments of the present application, the white carbon black is fumed white carbon black.

[0027] The fumed white carbon black is directly synthesized by realizing instant, large amount and uniform nucleation of silicon dioxide under the conditions of ultra-high temperature, gas phase environment and extremely short reaction time, and strictly limiting the subsequent growth process, so that the primary particle size of the silicon dioxide particles is nanoscale. Compared with the precipitated white carbon black, the fumed white carbon black has higher purity, less water content and larger specific surface area, and is more suitable for blending with fluororesin.

[0028] In some embodiments of the present application, the fumed white carbon black is fumed white carbon black modified by a modifier.

[0029] The surface of the fumed white carbon black has a large number of silicon hydroxyl groups, and the polar silicon hydroxyl groups affect the dispersion uniformity and compatibility of the fumed white carbon black in the fluororesin system, and further affect the dielectric loss, mechanical properties and flame retardant properties. In order to further increase the dispersion uniformity and compatibility of the fumed white carbon black in the fluororesin system, the white carbon black is modified by a modifier. The modifier includes organic halogenated silane, silane coupling agent, fatty alcohol compound, silazane and siloxane, etc. The organic halogenated silane includes dimethyl dichlorosilane, trimethyl chlorosilane, etc. The silane coupling agent includes hexamethyldisilazane, hexamethylethylsilazane, trimethylethoxysilane, methyltrimethoxysilane, etc. The fatty alcohol compound includes butanol, pentanol, straight-chain heptanol, etc. The silazane includes hexamethyldisilazane, etc. The siloxane includes hexamethyldisiloxane, etc. The modifier changes the hydroxyl groups on the surface of the fumed white carbon black into organic groups to increase the hydrophobicity of the fumed white carbon black.

[0030] In some embodiments of the present application, the mass ratio of the white carbon black to the fluororesin is (0.5-50):100.

[0031] Preferably, the mass ratio of the white carbon black to the fluororesin is (0.5-10):100.

[0032] It can be understood that the white carbon black content is too high, the white carbon black interface polarization is dominant, the signal transmission performance of the insulating material is sharply decreased, especially at high temperature; the fluororesin molecular chain gap is filled too much, the molecular chain movement is limited, the material is brittle; it is easy to cause agglomeration, form local hard points, and reduce the uniformity of the material. The white carbon black content is too low, and effective filling cannot be formed, so that the effect of improving the signal transmission performance of the insulating material and improving the mechanical properties of the fluororesin cannot be achieved.

[0033] In a second aspect of the present application, a preparation method of the signal transmission core insulating material is provided, and the preparation method comprises the following steps:

[0034] The raw materials are mixed uniformly, the raw materials comprise the white carbon black and the fluororesin, and the signal transmission core insulating material is obtained through extrusion equipment, stretching and cutting.

[0035] In some embodiments of the present application, the extrusion temperature of the extrusion equipment is 270-300 DEG C, and the screw rotation speed is 60-120 rpm.

[0036] It can be understood that the extrusion temperature of 270-300 DEG C can ensure that the glue is uniformly and fully melted, the flowability is increased, and the white carbon black and the fluororesin are fully combined. The screw rotation speed of 60-120 rpm ensures that the white carbon black and the fluororesin are fully and uniformly mixed.

[0037] In a third aspect of the present application, a signal transmission core is provided, which comprises a conductor and an insulating layer wrapped outside the conductor, and the insulating layer is prepared from the signal transmission core insulating material.

[0038] The content of the present application is explained through specific examples and data below.

[0039] Example 1

[0040] The signal transmission core insulating material comprises the following components in terms of mass ratio, as shown in Table 1:

[0041] ① Modified fumed white carbon black: 5 parts, wherein the fumed white carbon black is obtained from a commercial product (Japan, REOLOSIL QS102), and the modifier is dimethyl dichlorosilane;

[0042] ② Fluorinated ethylene propylene copolymer FEP (Daikin, NP-3180): 100 parts;

[0043] The preparation process of the signal transmission core insulating material is as follows:

[0044] 1) The above fluorinated ethylene propylene copolymer FEP (Daikin, NP-3180) is dried, and the raw materials are dried at 80 DEG C for 24 h to ensure that the FEP glue does not contain moisture;

[0045] 2) After drying the above modified fumed white carbon black, pre-mix with FEP particles, set the speed 850 rpm, blend for 5-10 min, to ensure that the modified fumed white carbon black and FEP particles are evenly mixed, wherein the mass ratio of the modified fumed white carbon black and FEP particles is 5:100;

[0046] 3) After the mixed rubber particles are melt blended by a single screw extruder, pelletization is performed, the extruder extrusion temperature is 270-300°C, the screw rotation speed is 100 rpm, to obtain the signal transmission core wire insulation material.

[0047] The signal transmission core wire comprises a conductor, an inner skin layer, an insulation layer and an outer skin layer, and the conductor is sequentially coated with the inner skin layer, the insulation layer and the outer skin layer. The conductor is a silver-plated copper wire, the inner skin layer and the outer skin layer are both solid FEP, and the insulation layer is prepared from the above signal transmission core wire insulation material.

[0048] The signal transmission core wire is prepared by a three-layer co-extrusion method, and the preparation method is as follows:

[0049] 1) Conductor preparation: annealed silver-plated copper wire is used

[0050] 2) Rubber treatment: inner skin layer / outer skin layer rubber: solid FEP particles (Japan Daikin NP3180), vacuum drying at 80°C for 4h;

[0051] 3) Three-layer co-extrusion:

[0052] The above inner skin layer rubber, signal transmission core wire insulation material and outer skin layer rubber are placed in different screws of a three-head co-extrusion machine, the first unit extrudes the inner skin layer FEP, the first unit is set to an extrusion temperature of 340°C and a screw rotation speed of 32 rpm, the second unit extrudes the signal transmission core wire insulation material, the second unit is set to an extrusion temperature of 350°C and a screw rotation speed of 34 rpm, the third unit extrudes the outer skin layer FEP, the third unit is set to an extrusion temperature of 370°C and a screw rotation speed of 38 rpm, and the three layers are extruded onto the surface of the conductor in the order of the inner skin layer, the insulation layer and the outer skin layer, and then cooled and dried to obtain the signal transmission core wire, with a diameter of 0.71 mm±0.01.

[0053] The above signal transmission core wire is made into a signal transmission core wire pair by a horizontal wrapping machine, the signal transmission core wire pair comprises two parallel and side-by-side signal transmission core wires, the two signal transmission core wires are coated with a shielding layer, then a ground wire is arranged on the side away from each other of the two signal transmission core wires, and finally a tape layer is coated outside. The shielding layer is a composite aluminum foil with the aluminum surface facing outward, and the tape layer is hot melt PET. The ground wire is a 0.2 mm silver-plated copper conductor.

[0054] Example 2

[0055] Signal transmission core wire insulation material, by mass ratio, includes the following components, see Table 1:

[0056] ① Modified fumed silica: 0.5 parts, wherein the fumed silica is obtained from the market (Japan, REOLOSIL QS102), and the modifier is dimethyl dichlorosilane;

[0057] ② Fluorinated ethylene propylene copolymer FEP (Daikin, NP-3180): 100 parts.

[0058] The signal transmission core wire insulation material is prepared as follows:

[0059] 1) Dry the above fluorinated ethylene propylene copolymer FEP (Daikin, NP-3180), dry the raw material at 80°C for 24h to ensure that the FEP compound does not contain moisture;

[0060] 2) Pre-mix the dried modified fumed silica with FEP particles, set the rotation speed to 850 rpm, and blend for 5-10 min to ensure uniform mixing of the modified fumed silica and FEP particles, wherein the mass ratio of the modified fumed silica to FEP particles is 0.5:100;

[0061] 3) After melting and blending the mixed glue particles with a single screw extruder, granulation is performed, the extruder extrusion temperature is 270-300°C, and the screw rotation speed is 100 rpm, to obtain the signal transmission core wire insulation material.

[0062] The structure and preparation method of the signal transmission core wire are similar to those of Example 1, and the difference between Example 1 is that the signal transmission core wire insulation material formula is different.

[0063] The structure of the signal transmission core wire pair is similar to that of Example 1, and the difference between Example 1 is that the signal transmission core wire insulation material formula is different.

[0064] Example 3

[0065] Signal transmission core wire insulation material, by mass ratio, includes the following components, see Table 1:

[0066] ① Modified fumed silica: 0.5 parts, wherein the fumed silica is obtained from the market (Japan, REOLOSIL QS102), and the modifier is dimethyl dichlorosilane;

[0067] ② Fluorinated ethylene propylene copolymer FEP (Daikin, NP-3180): 100 parts.

[0068] The signal transmission core wire insulation material is prepared as follows:

[0069] 1) Dry the above fluorinated ethylene propylene copolymer FEP (Daikin, NP-3180), dry the raw material at 80°C for 24h to ensure that the FEP compound does not contain moisture;

[0070] 2) Pre-mix the above modified fumed white carbon black and FEP particles after drying, set the rotation speed to 850 rpm, and blend for 5-10 min to ensure uniform mixing of the modified fumed white carbon black and FEP particles, wherein the mass ratio of the modified fumed white carbon black to the FEP particles is 10:100;

[0071] 3) After mixing the particles, melt blend them using a single screw extruder, the extruder extrusion temperature is 270-300°C, the screw rotation speed is 100 rpm, and the signal transmission core wire insulation material is obtained.

[0072] The structure and preparation method of the signal transmission core wire are similar to those of Example 1, and the difference from Example 1 is that the signal transmission core wire insulation material formula is different.

[0073] The structure of the signal transmission core wire pair is similar to that of Example 1, and the difference from Example 1 is that the signal transmission core wire insulation material formula is different.

[0074] Example 4

[0075] The signal transmission core wire insulation material includes the following components by mass ratio, see Table 1:

[0076] ① Modified fumed white carbon black: 5 parts, wherein the fumed white carbon black is obtained from a commercial product (Tokuyama, REOLOSIL QS102), and the modifier is dimethyl dichlorosilane;

[0077] ② Soluble polytetrafluoroethylene (DuPont, 951 HP PLUS): 100 parts.

[0078] The signal transmission core wire insulation material preparation process is as follows:

[0079] 1) Dry the above soluble polytetrafluoroethylene (DuPont, 951 HP PLUS), dry the raw material at 80°C for 24h to ensure that the soluble polytetrafluoroethylene compound does not contain moisture;

[0080] 2) Pre-mix the above modified fumed white carbon black and soluble polytetrafluoroethylene particles after drying, set the rotation speed to 850 rpm, and blend for 5-10 min to ensure uniform mixing of the modified fumed white carbon black and soluble polytetrafluoroethylene particles, wherein the mass ratio of the modified fumed white carbon black to the soluble polytetrafluoroethylene particles is 5:100;

[0081] 3) The mixed granules were melt blended by a single screw extruder, the extruder temperature was 270-300°C, the screw rotation speed was 100 rpm, and the signal transmission core wire insulating material was obtained.

[0082] The structure and preparation method of the signal transmission core wire were similar to those of Example 1, and the difference from Example 1 was that the signal transmission core wire insulating material formula was different.

[0083] The structure of the signal transmission core wire pair was similar to that of Example 1, and the difference from Example 1 was that the signal transmission core wire insulating material formula was different.

[0084] Comparative Example 1

[0085] This comparative example was similar to Example 1, and the only difference was that the fumed white carbon black was obtained from the market (Japan, REOLOSIL QS102), and was not modified, see Table 1.

[0086] The signal transmission core wire insulating material was prepared as follows:

[0087] 1) The fluorinated ethylene propylene copolymer FEP (Daikin, NP-3180) was dried, and the raw material was dried at 80°C for 24h to ensure that the FEP glue did not contain moisture;

[0088] 2) The dried fumed white carbon black and FEP particles were pre-mixed, the rotation speed was set to 850 rpm, and the blending time was 5-10 min to ensure uniform mixing of the fumed white carbon black and FEP particles, and the mass ratio of the fumed white carbon black to the FEP particles was 5:100;

[0089] 3) The mixed granules were melt blended by a single screw extruder, the extruder temperature was 270-300°C, the screw rotation speed was 100 rpm, and the signal transmission core wire insulating material was obtained.

[0090] The structure and preparation method of the signal transmission core wire were similar to those of Example 1, and the difference from Example 1 was that the signal transmission core wire insulating material formula was different.

[0091] The structure of the signal transmission core wire pair was similar to that of Example 1, and the difference from Example 1 was that the signal transmission core wire insulating material formula was different.

[0092] Comparative Example 2

[0093] This comparative example was similar to Example 1, and the only difference was that polyethylene (Sinopec, QHM22F) was used instead of FEP in the preparation process of the signal transmission core wire insulating material, see Table 1.

[0094] The signal transmission core wire insulating material was prepared as follows:

[0095] 1) The polyethylene (Sinopec, QHM22F) is dried, and the raw material is dried at 60°C for 24h to ensure that the PE compound is free of moisture;

[0096] 2) The modified fumed white carbon black after drying in Example 1 is premixed with PE particles, the rotation speed is set to 850 rpm, and the blending time is 5-10 min to ensure uniform mixing of the modified fumed white carbon black and the PE particles. The mass ratio of the modified fumed white carbon black to the PE particles is 5:100;

[0097] 3) The mixed rubber particles are melt blended using a single screw extruder, the extruder extrusion temperature is 180-230°C, and the screw rotation speed is 100 rpm to obtain the signal transmission core wire insulation material.

[0098] The structure and preparation method of the signal transmission core wire are similar to those of Example 1, and the difference from Example 1 is that the signal transmission core wire insulation material formula is different.

[0099] The structure of the signal transmission core wire pair is similar to that of Example 1, and the difference from Example 1 is that the signal transmission core wire insulation material formula is different.

[0100] Comparative Example 3

[0101] This comparative example is similar to Example 1, and the only difference is that the signal transmission core wire insulation material uses polytetrafluoroethylene PTFE (DuPont, Teflon PTFE) as a comparison, and is not blended with modified fumed white carbon black, see Table 1.

[0102] The structure and preparation method of the signal transmission core wire are similar to those of Example 1, and the difference from Example 1 is that the signal transmission core wire insulation material formula is different.

[0103] The structure of the signal transmission core wire pair is similar to that of Example 1, and the difference from Example 1 is that the signal transmission core wire insulation material formula is different.

[0104] Comparative Example 4

[0105] The signal transmission core wire insulation material includes the following components by mass ratio, see Table 1:

[0106] ① Modified fumed white carbon black: 0.3 parts, wherein the fumed white carbon black is obtained from a commercial product (Tokuyama, REOLOSIL QS102), and the modifier is dimethyldichlorosilane;

[0107] ② Fluorinated ethylene propylene copolymer FEP (Daikin, NP-3180): 100 parts.

[0108] The signal transmission core wire insulation material preparation process is as follows:

[0109] 1) Dry the above fluorinated ethylene propylene copolymer FEP (Daikin, NP-3180), dry the raw materials at 80°C for 24h to ensure that the FEP compound does not contain moisture;

[0110] 2) Pre-mix the above modified fumed white carbon black and FEP particles after drying, set the rotation speed to 850 rpm, and blend for 5-10 min to ensure uniform mixing of the modified fumed white carbon black and FEP particles, wherein the mass ratio of the modified fumed white carbon black to the FEP particles is 0.3:100;

[0111] 3) After melt blending the mixed rubber particles with a single screw extruder, pelletize, the extruder extrusion temperature is 270-300°C, the screw rotation speed is 100 rpm, and the signal transmission core wire insulation material is obtained.

[0112] The structure and preparation method of the signal transmission core wire are similar to those of Example 1, and the difference from Example 1 is that the signal transmission core wire insulation material is different.

[0113] The structure of the signal transmission core wire pair is similar to that of Example 1, and the difference from Example 1 is that the signal transmission core wire insulation material formula is different.

[0114] Comparative Example 5

[0115] The signal transmission core wire insulation material comprises the following components by mass ratio, see Table 1:

[0116] ① Modified fumed white carbon black: 15 parts, wherein the fumed white carbon black is obtained from a commercial product (Tokuyama, REOLOSIL QS102), and the modifier is dimethyldichlorosilane;

[0117] ② Fluorinated ethylene propylene copolymer FEP (Daikin, NP-3180): 100 parts.

[0118] The preparation process of the signal transmission core wire insulation material is as follows:

[0119] 1) Dry the above fluorinated ethylene propylene copolymer FEP (Daikin, NP-3180), dry the raw materials at 80°C for 24h to ensure that the FEP compound does not contain moisture;

[0120] 2) Pre-mix the above modified fumed white carbon black and FEP particles after drying, set the rotation speed to 850 rpm, and blend for 5-10 min to ensure uniform mixing of the modified fumed white carbon black and FEP particles, wherein the mass ratio of the modified fumed white carbon black to the FEP particles is 15:100;

[0121] 3) After melt blending the mixed rubber particles with a single screw extruder, pelletize, the extruder extrusion temperature is 270-300°C, the screw rotation speed is 100 rpm, and the signal transmission core wire insulation material is obtained.

[0122] The structure and preparation method of the signal transmission core wire are similar to those of Example 1, and the difference from Example 1 is that the signal transmission core wire insulation material is different.

[0123] The structure of the signal transmission core wire pair is similar to that of Example 1, and the difference from Example 1 is that the signal transmission core wire insulation material formula is different.

[0124] Comparative Example 6

[0125] The signal transmission core wire insulation material comprises the following components by mass ratio, see Table 1:

[0126] ① Modified precipitated white carbon black: 5 parts, wherein the precipitated white carbon black is obtained from a commercial product (Henan Haibo Rui, H-688), and the modifier is dimethyl dichlorosilane;

[0127] ② Fluorinated ethylene propylene copolymer FEP (Daikin, NP-3180): 100 parts.

[0128] The signal transmission core wire insulation material is prepared as follows:

[0129] 1) Dry the above fluorinated ethylene propylene copolymer FEP (Daikin, NP-3180), dry the raw material at 80°C for 24h to ensure that the FEP compound does not contain moisture;

[0130] 2) Pre-mix the dried modified precipitated white carbon black with the FEP particles, set the rotation speed to 850 rpm, and blend for 5-10 min to ensure uniform mixing of the modified precipitated white carbon black and the FEP particles, wherein the mass ratio of the modified precipitated white carbon black to the FEP particles is 5:100;

[0131] 3) After melt blending of the mixed glue particles with a single screw extruder, pelletize, the extruder extrusion temperature is 270-300°C, and the screw rotation speed is 100 rpm, to obtain the signal transmission core wire insulation material.

[0132] The structure and preparation method of the signal transmission core wire are similar to those of Example 1, and the difference from Example 1 is that the signal transmission core wire insulation material is different.

[0133] The structure of the signal transmission core wire pair is similar to that of Example 1, and the difference from Example 1 is that the signal transmission core wire insulation material formula is different.

[0134] The signal transmission core wire insulation material prepared in the above examples and comparative examples is injection molded, and the dielectric loss tangent, elongation at break, tensile strength, flame retardant grade are measured, and the signal transmission core wire pair prepared in the above examples and comparative examples is measured for characteristic impedance, attenuation, and delay, and the test standards are as follows:

[0135] (1) Dielectric constant

[0136] According to the international electrotechnical commission standard IEC60250, the product is tested, and based on the capacitance formula of parallel plate capacitor, the dielectric constant is inversely deduced by measuring the capacitance value of the sample as a medium.

[0137] Formula: capacitance of parallel capacitor

[0138] Wherein C is the capacitance (F), A is the electrode area (m 2 ), d is the sample thickness (m).

[0139] The test logic clamps the sample between two parallel metal electrodes to form a capacitor, measures the capacitance C with an LCR tester (QS37a-Yangzhou Suobo Electrical Co., Ltd.), and substitutes the formula to calculate Wherein ε0 is the vacuum dielectric constant. Each sample is measured three times, and the average value is taken.

[0140] (2) Dielectric loss tangent value

[0141] According to the international electrotechnical commission standard IEC60250, the capacitance (C) and equivalent series resistance (Rs) of the sample are measured, and the loss tangent is calculated through C and R s The dielectric loss of the sample in the parallel plate capacitor will be manifested as the "equivalent resistance" of the capacitance. The capacitance C and loss resistance Rs of the sample are measured with an LCR tester (QS37a-Yangzhou Suobo Electrical Co., Ltd.), and the loss tangent can be calculated through the formula.

[0142] Calculation formula: Wherein f is the test frequency. Each sample is measured three times, and the average value is taken.

[0143] (3) Elongation at break, tensile strength

[0144] According to the 9th clause of GB 1040-2008, the test temperature is 23±2℃, and the tensile test adopts standard dumbbell-shaped sample with a tensile speed of 250mm / min. The tensile strength and elongation at break of 5 samples are tested with a micro-controlled electronic universal material tension machine of Dongguan Gao Tie Detection Co., Ltd., and the results are averaged.

[0145] (4) Characteristic impedance, attenuation, delay

[0146] The following test conditions are adopted: the sampling test length is 3 meters, a network analyzer (E5071B Agilent) is used for testing, and the test termination frequency is 40GHz.

[0147] The test results are shown in Table 2.

[0148] Table 1 Preparation conditions of examples and comparative examples of the application

[0149]

[0150]

[0151] Table 2 Performance test table of inventive examples and comparative examples

[0152]

[0153] From Table 1 and Table 2, in inventive examples 1-4, the dielectric constant of the signal transmission core wire insulating material is 1.4-1.85 and the dielectric loss tangent is less than 2.5x10 -4 at 1MHz, which indicates that the signal transmission performance of the signal transmission core wire insulating material is excellent; the elongation at break is greater than 380% and is 388%-450%, and the tensile strength is greater than 24MPa and is 24.6-27.8MPa, which indicates that the mechanical properties of the signal transmission core wire insulating material are good. The attenuation of the signal transmission core wire pair prepared from the signal transmission core wire insulating material is 6.85-7.10dB / m and the delay is 4.07-4.66ns / m at 10GHz, which indicates that the attenuation is small and the signal integrity is good.

[0154] In comparative example 1, the signal transmission core wire insulating material is prepared from unmodified fumed white carbon black, the dielectric constant is 2.52 and the dielectric loss is 4.13x10 -4 , which indicates that the signal transmission performance of the core wire insulating material of comparative example 1 is greatly reduced; the elongation at break is 253% and the tensile strength is 24.2MPa, which indicates that the mechanical properties are reduced; the attenuation of the signal transmission core wire pair prepared from the signal transmission core wire insulating material of comparative example 1 is 7.82dB / m and the delay is 5.51ns / m at 10GHz, which indicates that the attenuation level is reduced and the signal integrity is poor, which indicates that the signal transmission performance and the mechanical properties of the modified fumed white carbon black of the present application are superior to those of the unmodified fumed white carbon black. The compatibility of the modified fumed white carbon black and the fluororesin is superior to that of the unmodified fumed white carbon black and the fluororesin, which avoids the phase separation of the two and improves the signal transmission performance and the mechanical properties of the insulating material. Therefore, the signal transmission performance and the mechanical properties of the signal transmission core wire insulating material prepared from the modified fumed white carbon black and the fluororesin blend are greatly improved compared with those of the unmodified fumed white carbon black and the fluororesin blend.

[0155] In comparative example 2, the signal transmission core wire insulating material is prepared from polyethylene and modified fumed white carbon black, the dielectric constant is 2.23 and the dielectric loss is 3.87x10 -4The 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. -4 Compared 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.

[0156] 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. -4, the dielectric constant increased by 29.6%, and the dielectric loss increased by 18.3%, indicating that the signal transmission performance of the core wire insulating material of Comparative Example 3 decreased. The signal transmission core wire pair prepared from the signal transmission core wire insulating material of Comparative Example 3 had an attenuation of 7.16 dB / m and a delay of 4.69 ns / m at 10 GHz, the attenuation level decreased, and the signal integrity deteriorated. The elongation at break of Comparative Example 3 was 350%, and the tensile strength was 23.2 MPa, the elongation at break decreased by 22.2%, and the tensile strength decreased by 16.5%, indicating that the mechanical properties of Example 1 increased. As can be seen, compared with pure fluororesin, the signal transmission performance and mechanical properties of the insulating material are improved by using fluororesin and modified fumed white carbon black blend.

[0157] Comparative Example 4, compared with Example 1, reduced the mass ratio of modified fumed white carbon black to FEP particles, the dielectric constant was 2.08, the dielectric loss tangent was 2.23 x 10 -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 insulating material of Comparative Example 4 decreased; the elongation at break was 355%, and the tensile strength was 23.5 MPa, the elongation at break decreased by 21.1%, and the tensile strength decreased by 15.5%. The signal transmission core wire pair prepared from the signal transmission core wire insulating material of Comparative Example 4 had an attenuation of 7.26 dB / m and a delay of 4.89 ns / m at 10 GHz, the attenuation level decreased, and the signal integrity deteriorated. As can be seen, compared with the blend with a mass ratio of modified fumed white carbon black to fluororesin of 0.5-10, the signal transmission performance and mechanical properties of the blend with a mass ratio of less than 0.5 decreased.

[0158] Comparative Example 5, compared with Example 1, increased the mass ratio of modified fumed white carbon black to FEP particles, the dielectric constant was 2.8, the dielectric loss tangent was 5.10 x 10 -4 , the dielectric constant increased by 72.8%, and the dielectric loss increased by 201.8%, indicating that the signal transmission performance of the core wire insulating material of Comparative Example 5 decreased significantly; the elongation at break was 173%, and the tensile strength was 20.1 MPa, the elongation at break decreased by 61.6%, and the tensile strength decreased by 27.7%. The signal transmission core wire pair prepared from the signal transmission core wire insulating material of Comparative Example 5 had an attenuation of 6.99 dB / m and a delay of 4.47 ns / m at 10 GHz, the attenuation level decreased, and the signal integrity deteriorated. As can be seen, compared with the blend with a mass ratio of modified fumed white carbon black to fluororesin of 0.5-10, the signal transmission performance and mechanical properties of the blend with a mass ratio of more than 10 decreased significantly.

[0159] Comparative Example 6, compared with Example 1, used modified precipitated white carbon black and fluororesin blend, the dielectric constant was 2.4, and the dielectric loss of the signal transmission core wire insulating material was 4.62 x 10 -4The dielectric constant is increased by 48.1%, and the dielectric loss is increased by 173.3%, which indicates that the signal transmission performance of the core wire insulating material of Comparative Example 6 is greatly reduced; the elongation at break of Comparative Example 6 is 379%, and the tensile strength is 25.2 MPa, the elongation at break is decreased by 15.8%, and the tensile strength is decreased by 9.4%, which indicates that the mechanical properties of Comparative Example 6 are decreased; the attenuation of the signal transmission core wire pair prepared from the signal transmission core wire insulating material of Comparative Example 6 is 7.15 dB / m, and the delay is 4.86 ns / m at 10 GHz, the attenuation level is reduced, and the signal integrity is poor, which indicates that the signal transmission performance and the mechanical properties of the modified fumed white carbon black of the application are better than those of the modified precipitated white carbon black. It can be seen that the signal transmission performance and the mechanical properties of the signal transmission core wire insulating material are improved by using the modified fumed white carbon black and the fluororesin blend compared with the modified precipitated white carbon black and the fluororesin blend.

[0160] As can be seen from the above Examples 1-4 and Comparative Examples 1-6, when the mass ratio of the modified fumed white carbon black to the fluororesin is between 0.5-10, the modified fumed white carbon black and the fluororesin form a synergistic effect, and the signal transmission performance and the mechanical properties of the material formed by the two are better.

[0161] The above are only preferred embodiments of the application, and do not limit the patent scope of the application. For those skilled in the art, the application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the application shall be included in the patent protection scope of the application.

Claims

1. A signal transmission core wire insulation material, characterized in that, Including silica and fluoropolymers.

2. The signal transmission core wire insulation material as described in claim 1, characterized in that, 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 of more than 380% and a tensile strength of more than 24 MPa.

3. 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.

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

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

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. A method for preparing the signal transmission core wire insulation material as described in claim 1, characterized in that, Includes the following steps: 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 the signal transmission core wire insulation material.

9. A method for preparing the signal transmission core wire insulation material as described in claim 8, characterized in that, The extrusion equipment has an extrusion temperature of 270-300℃ and a screw speed of 60-120rpm.

10. A signal transmission core wire, characterized in that, It includes a conductor and an insulating layer wrapped around the conductor, the insulating layer being made of the signal transmission core wire insulation material as described in claim 1.

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