Insulated cable and preparation method thereof

Abstract

The invention relates to an insulated cable and a preparation method thereof, and the insulated cable provided by the invention comprises the following raw material components: 50-75 parts by mass of polyether-ether-ketone, 5-20 parts by mass of a flame retardant, 5-20 parts by mass of a flexibilizer, 0.1-5 parts by mass of a wear-resistant agent, 1-5 parts by mass of a compatilizer, 0.1-5 parts by mass of an antioxidant, and 0.1-5 parts by mass of an auxiliary antioxidant. Wherein the flame retardant at least comprises modified calcium carbonate and polyhedral oligomeric silsesquioxane; the mass ratio of the modified calcium carbonate to the polyhedral oligomeric silsesquioxane is 1: (0.8-1.2); the modified calcium carbonate is obtained by performing surface modification on hydroxy carboxylic acid organic acid. The hydroxyl carboxylic acid organic acid molecule contains hydroxyl and carboxyl, and can be chemically bonded with Ca < 2 + > in calcium carbonate to form a stable Ca (COOR) 2 structure, so that the surface binding property between calcium carbonate and polyether-ether-ketone is enhanced, and the effect of enhancing plasticity is further achieved.

Description

Technical Field

[0001] This invention relates to the field of cable manufacturing technology, specifically to an insulated cable and its preparation method. Background Technology

[0002] Polyetheretherketone (PEEK), as the main raw material for insulated cables, has advantages such as high temperature resistance and good thermal stability. However, when exposed to flame combustion, it will drip, which greatly limits its application in flame-retardant protection. Existing technology adds calcium carbonate to PEEK. When heated, calcium carbonate decomposes to produce CO2, which plays a flame-retardant role and enhances the flame-retardant performance of PEEK cables.

[0003] However, calcium carbonate has a surface rich in polar hydroxyl groups, which makes it incompatible with polymer-based materials and prone to agglomeration, forming a weak interface layer. This increases the brittleness of polyetheretherketone and fails to meet the application requirements. Summary of the Invention

[0004] This invention provides an insulated cable and its preparation method to solve the problem of increased brittleness caused by adding calcium carbonate to polyetheretherketone.

[0005] In a first aspect, the present invention provides an insulated cable comprising the following raw material components: 50-75 parts by weight of polyetheretherketone, 5-20 parts by weight of flame retardant, 5-20 parts by weight of toughening agent, 0.1-5 parts by weight of abrasion resistant agent, 1-5 parts by weight of compatibilizer, 0.1-5 parts by weight of antioxidant, and 0.1-5 parts by weight of auxiliary antioxidant; The flame retardant includes at least modified calcium carbonate and cage-type silsesquioxane; The mass ratio of the modified calcium carbonate to the cage-type silsesquioxane is 1:0.8-1.2; The modified calcium carbonate is obtained by surface modification with hydroxycarboxylic acid organic acids.

[0006] In one optional embodiment, the melt index of the polyetheretherketone is 20-50 g / 10 min under test conditions of 380°C / 5 kg, and the test standard is ISO 1133-1:2011; The hydroxycarboxylic acid organic acids include one of malic acid, tartaric acid, and citric acid; The cage-like silsesquioxane includes one of octaphenyl cage-like silsesquioxane, octamethyl cage-like silsesquioxane, octanaphthyl cage-like silsesquioxane, and vinyl cage-like silsesquioxane.

[0007] In one optional embodiment, the method for preparing the modified calcium carbonate includes: placing calcium carbonate powder in a modifier solution to obtain a slurry with a mass fraction of 10-20%, and reacting it at 60-80°C under stirring conditions for a reaction time of 30-60 minutes. The solute of the modifier is a hydroxycarboxylic acid organic acid, and the solvent is water; The mass fraction of the modifier is 10-20%.

[0008] In one alternative embodiment, the toughening agent includes at least one of thermoplastic polyester elastomer (TPEE), thermoplastic polyurethane (TPU), and polydodecanoic acid lactam (PA12).

[0009] In one alternative embodiment, the wear-resistant agent comprises at least hexagonal boron nitride micro powder and polytetrafluoroethylene micro powder (PTFE micro powder). The mass ratio of the hexagonal boron nitride micro powder to the polytetrafluoroethylene micro powder is 1:2-3.

[0010] In one alternative embodiment, the compatibilizer includes either ethylene-butyl acrylate-glycidyl methacrylate copolymer (PTW) or ethylene-methyl acrylate copolymer (EMA).

[0011] Secondly, the present invention also provides a method for preparing the above-mentioned insulated cable, comprising: weighing raw materials according to the mass fractions of each component, stirring the weighed raw materials until they are uniformly mixed, extruding and granulating the mixed material to obtain a modified polyether ether ketone material, and extruding and coating the obtained modified polyether ether ketone material onto a metal conductor to obtain an insulated cable.

[0012] In one optional embodiment, the extrusion granulation includes: extruding and granulating the uniformly mixed raw materials at a temperature of 350-370°C.

[0013] In one optional embodiment, the extrusion coating includes: extruding the prepared modified polyether ether ketone material onto the metal wire at a temperature of 320-360°C.

[0014] In one alternative embodiment, the metal wire is preheated before extrusion coating. The preheating temperature is 60-70℃.

[0015] The technical solution of this invention has the following advantages: 1. This invention provides an insulated cable comprising the following raw material components: 50-75 parts by weight of polyetheretherketone, 5-20 parts by weight of flame retardant, 5-20 parts by weight of toughening agent, 0.1-5 parts by weight of abrasion resistant agent, 1-5 parts by weight of compatibilizer, 0.1-5 parts by weight of antioxidant, and 0.1-5 parts by weight of auxiliary antioxidant; wherein the flame retardant comprises at least modified calcium carbonate and cage-like silsesquioxane; the mass ratio of modified calcium carbonate to cage-like silsesquioxane is 1:0.8-1.2; the modified calcium carbonate is obtained by surface modification with hydroxycarboxylic acid organic acids.

[0016] This invention uses hydroxycarboxylic acid organic acids as modifiers. Hydroxycarboxylic acid organic acid molecules contain hydroxyl and carboxyl groups; these active groups can react with the Ca in calcium carbonate. 2+ Chemical bonding occurs, forming a stable Ca(COOR)2 structure, which enhances the surface bonding between calcium carbonate and polyether ether ketone, thereby improving the tensile strength and fracture growth rate of the material. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a process flow diagram of extrusion granulation in an embodiment of the present invention; Figure 2 This is a process flow diagram of extrusion coating in an embodiment of the present invention. Detailed Implementation

[0019] The following embodiments are provided to better understand the present invention, but the following embodiments do not constitute a limitation on the content and scope of protection of the present invention. Any product that is the same as or similar to the present invention, derived by any person under the guidance of the present invention or by combining the features of the present invention with other prior art, falls within the scope of protection of the present invention.

[0020] Unless otherwise specified, all experimental steps or conditions in the examples were performed according to conventional experimental procedures and conditions in the art. Reagents or instruments whose manufacturers are not specified are all commercially available products.

[0021] Example 1 This embodiment provides an insulated cable and a method for preparing the insulated cable.

[0022] The insulated cable comprises the following raw material components: 75 parts by weight of polyetheretherketone, 5 parts by weight of compatibilizer, 5 parts by weight of toughening agent, 4 parts by weight of abrasion resistant agent, 10 parts by weight of flame retardant, 0.5 parts by weight of antioxidant, and 0.5 parts by weight of auxiliary antioxidant. The melt index of polyetheretherketone (PEEK) is 30 g / 10 min. The PEEK was purchased from Vigtrex UK, model Victrex-450G. The compatibilizer used was EMA, purchased from Arcoma, France, model LOTRYL™ series AX8900; The toughening agent used is PA12, purchased from Evonik Industries AG, Germany, model VESTAMID® series-L1940; The wear-resistant agent is a composite wear-resistant agent made of PTFE micro powder and hexagonal boron nitride micro powder in a mass ratio of 3:1; The PTFE was purchased from Daikin Industries, Ltd. of Japan, model L-5; The particle size of PTFE micro powder is 5 μm, and the particle size of hexagonal boron nitride micro powder is 3 μm.

[0023] The flame retardant is a mixture of modified calcium carbonate and octaphenyl cage-type silsesquioxane in a mass ratio of 1:1; The antioxidant is a hindered phenolic antioxidant, specifically brand number 3114; The auxiliary antioxidant is a phosphite-based auxiliary antioxidant, specifically brand number 9228.

[0024] The method for preparing the insulated cable includes the following steps: Preparation of flame retardant: A DL-malic acid modifier solution with a mass fraction of 10% was prepared using deionized water as a solvent; calcium carbonate powder was weighed and added to the prepared modifier solution to prepare a slurry with a calcium carbonate powder mass fraction of 15%; the slurry was placed in a reaction vessel and reacted at 70℃ with stirring for 40 min, followed by solid-liquid separation. The separated powder was washed, dried, and ground to obtain modified calcium carbonate; the modified calcium carbonate was mixed with octaphenyl cage-type silsesquioxane at a mass ratio of 1:1 to obtain the flame retardant; The octaphenyl cage-type silsesquioxane was purchased from Guangzhou Yixin Technology Co., Ltd., model number Ecotion® POSS103.

[0025] Preparation of wear-resistant agent: PTFE micro powder and hexagonal boron nitride micro powder are mixed in a ratio of 3:1 to obtain wear-resistant agent; Material mixing: Weigh each raw material component according to the above raw material mass parts, place each weighed raw material component in a mixer and stir for 3 minutes to make it evenly mixed; Extrusion granulation: according to as follows Figure 1The process flow diagram shown illustrates the extrusion granulation process. The uniformly mixed material is fed into a twin-screw extruder for extrusion granulation. The temperatures of the twin-screw extruder are controlled as follows: Zone 1: 100℃; Zone 2: 150℃; Zone 3: 350℃; Zone 4: 370℃; Zone 5: 370℃; Zone 6: 370℃; Zone 7: 370℃; Die head temperature: 350℃; Screw speed: 370 r / min. Modified polyetheretherketone (PEEK) material is obtained, with a particle size of approximately 3 mm. Extrusion coating: according to as follows Figure 2 The process flow diagram shown illustrates that the modified polyether ether ketone material is added to the extrusion coating machine to extrude and coat copper wire. The copper wire is preheated before coating at a temperature of 60°C, with the wire speed controlled at 80 m / min. The temperatures in zones 1, 2, and 3 are 320°C, 340°C, 360°C, 350°C at the die head, 350°C at the eyepiece, and 360°C at the flange, resulting in an insulated cable.

[0026] Example 2 This embodiment provides an insulated cable and a method for preparing the insulated cable.

[0027] The insulated cable comprises the following raw material components: 70 parts by weight of polyetheretherketone, 5 parts by weight of compatibilizer, 10 parts by weight of toughening agent, 4 parts by weight of abrasion resistant agent, 10 parts by weight of flame retardant, 0.5 parts by weight of antioxidant, and 0.5 parts by weight of auxiliary antioxidant. The melt index of polyetheretherketone (PEEK) is 30 g / 10 min. The PEEK was purchased from Vigtrex UK, model Victrex-450G. The compatibilizer used was EMA, purchased from Arcoma, France, model LOTRYL™ series AX8900; The toughening agent used is PA12, purchased from Evonik Industries AG, Germany, model VESTAMID® series-L1940; The wear-resistant agent is a composite wear-resistant agent made of PTFE micro powder and hexagonal boron nitride micro powder in a mass ratio of 3:1; The PTFE was purchased from Daikin Industries, Ltd. of Japan, model L-5; The particle size of PTFE micro powder is 5 μm, and the particle size of hexagonal boron nitride micro powder is 3 μm.

[0028] The flame retardant is a mixture of modified calcium carbonate and octaphenyl cage-type silsesquioxane in a mass ratio of 1:1; The antioxidant is a hindered phenolic antioxidant, specifically brand number 3114; The auxiliary antioxidant is a phosphite-based auxiliary antioxidant, specifically brand number 9228.

[0029] The method for preparing the insulated cable includes the following steps: Preparation of flame retardant: A DL-malic acid modifier solution with a mass fraction of 10% was prepared using deionized water as a solvent; calcium carbonate powder was weighed and added to the prepared modifier solution to prepare a slurry with a calcium carbonate powder mass fraction of 15%; the slurry was placed in a reaction vessel and reacted at 70℃ with stirring for 40 min, followed by solid-liquid separation. The separated powder was washed, dried, and ground to obtain modified calcium carbonate; the modified calcium carbonate was mixed with octaphenyl cage-type silsesquioxane at a mass ratio of 1:1 to obtain the flame retardant; The octaphenyl cage-type silsesquioxane was purchased from Guangzhou Yixin Technology Co., Ltd., model number Ecotion® POSS103.

[0030] Preparation of wear-resistant agent: PTFE micro powder and hexagonal boron nitride micro powder are mixed in a ratio of 3:1 to obtain wear-resistant agent; Material mixing: Weigh each raw material component according to the above raw material mass parts, place each weighed raw material component in a mixer and stir for 3 minutes to make it evenly mixed; Extrusion granulation: The uniformly mixed material is added to a twin-screw extruder for extrusion granulation. The temperature of the twin-screw extruder is controlled as follows: Zone 1: 100℃, Zone 2: 150℃, Zone 3: 350℃, Zone 4: 370℃, Zone 5: 370℃, Zone 6: 370℃, Zone 7: 370℃, Die head temperature: 350℃, Screw speed: 370 r / min. Modified polyether ether ketone material is prepared with a particle size of 3 mm. Extrusion Coating: The modified polyether ether ketone material is added to an extrusion coating machine to extrude and coat copper wire. The copper wire is preheated before coating at a temperature of 60°C. The wire speed is controlled at 80 m / min. The temperature of zone 1 is 320°C, zone 2 is 340°C, zone 3 is 360°C, the die head temperature is 350°C, the eye temperature is 350°C, and the flange temperature is 360°C to obtain insulated cable.

[0031] Example 3 This embodiment provides an insulated cable and a method for preparing the insulated cable.

[0032] The insulated cable comprises the following raw material components: 65 parts by weight of polyetheretherketone, 5 parts by weight of compatibilizer, 15 parts by weight of toughening agent, 4 parts by weight of abrasion resistant agent, 10 parts by weight of flame retardant, 0.5 parts by weight of antioxidant, and 0.5 parts by weight of auxiliary antioxidant. The melt index of polyetheretherketone (PEEK) is 30 g / 10 min. The PEEK was purchased from Vigtrex UK, model Victrex-450G. The compatibilizer used was EMA, purchased from Arcoma, France, model LOTRYL™ series AX8900; The toughening agent used is PA12, purchased from Evonik Industries AG, Germany, model VESTAMID® series-L1940; The wear-resistant agent is a composite wear-resistant agent made of PTFE micro powder and hexagonal boron nitride micro powder in a mass ratio of 3:1; The PTFE was purchased from Daikin Industries, Ltd. of Japan, model L-5; The particle size of PTFE micro powder is 5 μm, and the particle size of hexagonal boron nitride micro powder is 3 μm.

[0033] The flame retardant is a mixture of modified calcium carbonate and octaphenyl cage-type silsesquioxane in a mass ratio of 1:1; The antioxidant is a hindered phenolic antioxidant, specifically brand number 3114; The auxiliary antioxidant is a phosphite-based auxiliary antioxidant, specifically brand number 9228.

[0034] The method for preparing the insulated cable includes the following steps: Preparation of flame retardant: A DL-malic acid modifier solution with a mass fraction of 10% was prepared using deionized water as a solvent; calcium carbonate powder was weighed and added to the prepared modifier solution to prepare a slurry with a calcium carbonate powder mass fraction of 15%; the slurry was placed in a reaction vessel and reacted at 70℃ with stirring for 40 min, followed by solid-liquid separation. The separated powder was washed, dried, and ground to obtain modified calcium carbonate; the modified calcium carbonate was mixed with octaphenyl cage-type silsesquioxane at a mass ratio of 1:1 to obtain the flame retardant; The octaphenyl cage-type silsesquioxane was purchased from Guangzhou Yixin Technology Co., Ltd., model number Ecotion® POSS103.

[0035] Preparation of wear-resistant agent: PTFE micro powder and hexagonal boron nitride micro powder are mixed in a ratio of 3:1 to obtain wear-resistant agent; Material mixing: Weigh each raw material component according to the above raw material mass parts, place each weighed raw material component in a mixer and stir for 3 minutes to make it evenly mixed; Extrusion granulation: The uniformly mixed material is added to a twin-screw extruder for extrusion granulation. The temperature of the twin-screw extruder is controlled as follows: Zone 1: 100℃, Zone 2: 150℃, Zone 3: 350℃, Zone 4: 370℃, Zone 5: 370℃, Zone 6: 370℃, Zone 7: 370℃, Die head temperature: 350℃, Screw speed: 370 r / min. Modified polyether ether ketone material is prepared with a particle size of 3 mm. Extrusion Coating: The modified polyether ether ketone material is added to an extrusion coating machine to extrude and coat copper wire. The copper wire is preheated before coating at a temperature of 60°C. The wire speed is controlled at 80 m / min. The temperature of zone 1 is 320°C, zone 2 is 340°C, zone 3 is 360°C, the die head temperature is 350°C, the eye temperature is 350°C, and the flange temperature is 360°C to obtain insulated cable.

[0036] Example 4 This embodiment provides an insulated cable and a method for preparing the insulated cable.

[0037] The insulated cable comprises the following raw material components: 70 parts by weight of polyetheretherketone, 5 parts by weight of compatibilizer, 10 parts by weight of toughening agent, 4 parts by weight of abrasion resistant agent, 10 parts by weight of flame retardant, 0.5 parts by weight of antioxidant, and 0.5 parts by weight of auxiliary antioxidant. The melt index of polyetheretherketone (PEEK) is 30 g / 10 min. The PEEK was purchased from Vigtrex UK, model Victrex-450G. The compatibilizer used was PTW, purchased from Dow Chemical Company, USA, model ELVALOY™ PTW; The toughening agent used was TPEE, purchased from DuPont, USA, model Hytrel® 4069; The wear-resistant agent is a composite wear-resistant agent made of PTFE micro powder and hexagonal boron nitride micro powder in a mass ratio of 3:1; The PTFE was purchased from Daikin Industries, Ltd. of Japan, model L-5; The particle size of PTFE micro powder is 5 μm, and the particle size of hexagonal boron nitride micro powder is 3 μm.

[0038] The flame retardant is a mixture of modified calcium carbonate and octaphenyl cage-type silsesquioxane in a mass ratio of 1:1; The antioxidant is a hindered phenolic antioxidant, specifically brand number 3114; The auxiliary antioxidant is a phosphite-based auxiliary antioxidant, specifically brand number 9228.

[0039] The method for preparing the insulated cable includes the following steps: Preparation of flame retardant: A DL-malic acid modifier solution with a mass fraction of 10% was prepared using deionized water as a solvent; calcium carbonate powder was weighed and added to the prepared modifier solution to prepare a slurry with a calcium carbonate powder mass fraction of 15%; the slurry was placed in a reaction vessel and reacted at 70℃ with stirring for 40 min, followed by solid-liquid separation. The separated powder was washed, dried, and ground to obtain modified calcium carbonate; the modified calcium carbonate was mixed with octaphenyl cage-type silsesquioxane at a mass ratio of 1:1 to obtain the flame retardant; The octaphenyl cage-type silsesquioxane was purchased from Guangzhou Yixin Technology Co., Ltd., model number Ecotion® POSS103.

[0040] Preparation of wear-resistant agent: PTFE micro powder and hexagonal boron nitride micro powder are mixed in a ratio of 3:1 to obtain wear-resistant agent; Material mixing: Weigh each raw material component according to the above raw material mass parts, place each weighed raw material component in a mixer and stir for 3 minutes to make it evenly mixed; Extrusion granulation: The uniformly mixed material is added to a twin-screw extruder for extrusion granulation. The temperature of the twin-screw extruder is controlled as follows: Zone 1: 100℃, Zone 2: 150℃, Zone 3: 350℃, Zone 4: 370℃, Zone 5: 370℃, Zone 6: 370℃, Zone 7: 370℃, Die head temperature: 350℃, Screw speed: 370 r / min. Modified polyether ether ketone material is prepared with a particle size of 3 mm. Extrusion Coating: The modified polyether ether ketone material is added to an extrusion coating machine to extrude and coat copper wire. The copper wire is preheated before coating at a temperature of 60°C. The wire speed is controlled at 80 m / min. The temperature of zone 1 is 320°C, zone 2 is 340°C, zone 3 is 360°C, the die head temperature is 350°C, the eye temperature is 350°C, and the flange temperature is 360°C to obtain insulated cable.

[0041] Comparative Example 1 This comparative example provides an insulated cable and a method for preparing the insulated cable.

[0042] The insulated cable comprises the following raw material components: 75 parts by weight of polyetheretherketone, 5 parts by weight of compatibilizer, 5 parts by weight of toughening agent, 4 parts by weight of abrasion resistant agent, 10 parts by weight of flame retardant, 0.5 parts by weight of antioxidant, and 0.5 parts by weight of auxiliary antioxidant. The melt index of polyetheretherketone (PEEK) is 30 g / 10 min. The PEEK was purchased from Vigtrex UK, model Victrex-450G. The compatibilizer used was EMA, purchased from Arcoma, France, model LOTRYL™ series AX8900; The toughening agent used is PA12, purchased from Evonik Industries AG, Germany, model VESTAMID® series-L1940; The wear-resistant agent is a composite wear-resistant agent made of PTFE micro powder and hexagonal boron nitride micro powder in a mass ratio of 3:1; The PTFE was purchased from Daikin Industries, Ltd. of Japan, model L-5; The particle size of PTFE micro powder is 5 μm, and the particle size of hexagonal boron nitride micro powder is 3 μm.

[0043] The flame retardant is a mixture of calcium carbonate and octaphenyl cage-type silsesquioxane in a mass ratio of 1:1; The antioxidant is a hindered phenolic antioxidant, specifically brand number 3114; The auxiliary antioxidant is a phosphite-based auxiliary antioxidant, specifically brand number 9228.

[0044] The method for preparing the insulated cable includes the following steps: Preparation of flame retardant: Calcium carbonate and octaphenyl cage-type silsesquioxane are mixed at a mass ratio of 1:1 to obtain the flame retardant; The octaphenyl cage-type silsesquioxane was purchased from Guangzhou Yixin Technology Co., Ltd., model number Ecotion® POSS103.

[0045] Preparation of wear-resistant agent: PTFE micro powder and hexagonal boron nitride micro powder are mixed in a ratio of 3:1 to obtain wear-resistant agent; Material mixing: Weigh each raw material component according to the above raw material mass parts, place each weighed raw material component in a mixer and stir for 3 minutes to make it evenly mixed; Extrusion granulation: The uniformly mixed material is added to a twin-screw extruder for extrusion granulation. The temperature of the twin-screw extruder is controlled as follows: Zone 1: 100℃, Zone 2: 150℃, Zone 3: 350℃, Zone 4: 370℃, Zone 5: 370℃, Zone 6: 370℃, Zone 7: 370℃, Die head temperature: 350℃, Screw speed: 370 r / min. Modified polyether ether ketone material is prepared with a particle size of 3 mm. Extrusion Coating: The modified polyether ether ketone material is added to an extrusion coating machine to extrude and coat copper wire. The copper wire is preheated before coating at a temperature of 60°C. The wire speed is controlled at 80 m / min. The temperature of zone 1 is 320°C, zone 2 is 340°C, zone 3 is 360°C, the die head temperature is 350°C, the eye temperature is 350°C, and the flange temperature is 360°C to obtain insulated cable.

[0046] Experimental Example 1 The performance of the insulated cables prepared in Examples 1-4 and Comparative Example 1 of the present invention was tested. The tensile strength and elongation at break performance tests were conducted in accordance with GB / T 1040.2-2022 "Determination of tensile properties of plastics - Part 2: Test conditions for molded and extruded plastics". The destructive voltage performance test was conducted in accordance with GB / T 4074.5-2024 "Test methods for winding wires - Part 5: Electrical properties"; The scratch resistance test was conducted in accordance with GB / T 4074.3-2024 "Test methods for winding wires - Part 3: Mechanical properties"; The withstand voltage performance of copper rods was tested in accordance with GB / T 4074.5-2024 "Test methods for winding wires - Part 5: Electrical properties"; The test method for spark test performance is as follows: start the spark detector, set the voltage to 3KV, and after the voltage stabilizes, pass the cable through the electrodes and record the number of spark points that appear after 3000m. The test method for 90° bending (275℃) after thermal shock is as follows: wrap the cable around a copper rod 10 times and put it in an oven. Set the oven temperature to 275℃ and leave it for half an hour. After the cable has cooled down, straighten it and bend it 90°. Observe whether there is any breakage at the bend. Flame retardancy: Tested according to UL 94, using a 1.6mm flame retardant sample. The specific test method is as follows: A sample strip measuring 125±5 mm in length, 13.0±0.5 mm in width, and 0.8±0.5 mm in thickness was vertically fixed. The bottom of the sample was ignited with a flame for 10±0.5 seconds, the flame was removed, and the first afterflame time t1 was recorded. After the flame extinguished, it was ignited again for 10±0.5 seconds, and the second afterflame time t2 and afterglow time were recorded. The grade (V-0, V-1, V-2) was determined based on the afterflame time and the amount of dripping material.

[0047] Molten droplets: According to UL 94, ignite a cable with an insulation layer thickness of 0.1mm and observe whether molten droplets fall after the flame is extinguished. The specific method is as follows: Burn the flame at the center of the lower edge of the cable sample for 10 ± 0.5 seconds, then remove the flame at a speed of 300 mm / s to a distance of at least 150 mm, and record the first afterflame time t1. After the flame extinguishes, immediately burn it again for 10 ± 0.5 seconds and remove it, recording the second afterflame time t2 and afterglow time. Judgment criteria: V-0: Afterflame time ≤ 10 seconds each time, no burning material dripping. V-1: Afterflame time ≤ 30 seconds each time, dripping of non-combustible particles is allowed.

[0048] The product performance test results are shown in Table 1 below: Table 1: Performance Tests of Insulated Cables

[0049] As can be seen from the performance test comparison between Example 1 and Comparative Example 1 in Table 1, after surface modification of calcium carbonate with malic acid, the tensile strength and elongation at break of the material are significantly improved. In the cable performance test, there is no significant difference between the cables prepared in Example 1 and Comparative Example 1. This application significantly improves the tensile strength and elongation at break of the material by surface modification of calcium carbonate without reducing other properties, which can meet higher usage requirements.

[0050] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. An insulated cable, characterized in that, It includes the following raw material components: 50-75 parts by weight of polyetheretherketone, 5-20 parts by weight of flame retardant, 5-20 parts by weight of toughening agent, 0.1-5 parts by weight of wear-resistant agent, 1-5 parts by weight of compatibilizer, 0.1-5 parts by weight of antioxidant, and 0.1-5 parts by weight of auxiliary antioxidant; The flame retardant includes at least modified calcium carbonate and cage-type silsesquioxane; The mass ratio of the modified calcium carbonate to the cage-type silsesquioxane is 1:0.8-1.2; The modified calcium carbonate is obtained by surface modification with hydroxycarboxylic acid organic acids.

2. The insulated cable according to claim 1, characterized in that, The melt index of the polyetheretherketone is 20-50 g / 10 min under test conditions of 380℃ / 5 kg; And / or, the hydroxycarboxylic acid organic acid includes one of malic acid, tartaric acid, and citric acid; And / or, the cage-like silsesquioxane includes one of octaphenyl cage-like silsesquioxane, octamethyl cage-like silsesquioxane, octanaphthyl cage-like silsesquioxane, and vinyl cage-like silsesquioxane.

3. The insulated cable according to claim 1, characterized in that, The method for preparing the modified calcium carbonate includes: placing calcium carbonate powder in a modifier solution to obtain a slurry with a mass fraction of 10-20%, and reacting it at 60-80℃ under stirring conditions for a reaction time of 30-60 minutes. The solute of the modifier is a hydroxycarboxylic acid organic acid, and the solvent is water; The mass fraction of the modifier is 10-20%.

4. The insulated cable according to claim 1, characterized in that, The toughening agent includes at least one of thermoplastic polyester elastomer, thermoplastic polyurethane, and polydodecanoic acid.

5. The insulated cable according to claim 1, characterized in that, The wear-resistant agent includes at least hexagonal boron nitride micro powder and polytetrafluoroethylene micro powder; Preferably, the mass ratio of the hexagonal boron nitride micro powder to the polytetrafluoroethylene micro powder is 1:2-3.

6. The insulated cable according to claim 1, characterized in that, The compatibilizer includes any one of ethylene-butyl acrylate-glycidyl methacrylate copolymer and ethylene-methyl acrylate copolymer.

7. A method for preparing an insulated cable as described in any one of claims 1-6, characterized in that, include: The raw materials are weighed according to the mass fractions of each component and mixed. The weighed raw materials are stirred until they are evenly mixed. The mixed material is extruded and granulated to obtain modified polyether ether ketone material. The obtained modified polyether ether ketone material is extruded and coated onto metal wires to obtain insulated cables.

8. The preparation method according to claim 7, characterized in that, The extrusion granulation includes: extruding and granulating the uniformly mixed raw materials at a temperature of 350-370°C.

9. The preparation method according to claim 7, characterized in that, The extrusion coating includes: extruding and coating the metal wire with the prepared modified polyether ether ketone material at 320-360°C.

10. The preparation method according to claim 9, characterized in that, The metal wire is preheated before being extruded and coated. Preferably, the preheating temperature is 60-70°C.

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