PEEK polymer material composition, multi-strand stranded cable and preparation method

Abstract

The invention discloses a PEEK polymer material composition, a multi-stranded cable and a preparation method, and relates to the technical field of cable manufacturing, the disclosed PEEK polymer material composition comprises the following components by weight: 50-80% of PEEK, 10-30% of a PFPE dispersion, 5-15% of a silicone component precursor which is an amino silicone oil emulsion, 1-5% of a foaming agent, 1-5% of a coupling agent, 1-5% of a coupling agent, and the balance of water. The additive is selected from one of azodicarbonamide, sodium bicarbonate or supercritical # imgabs0 #, and the additive comprises at least one of nano-zinc oxide, carbon nanotubes or graphene; through the components and proportion, optimization and collaboration of the performance of the multi-strand stranded wire cable material are realized, and the reliability of the multi-strand stranded wire cable in an extreme environment is improved.

Description

Technical Field

[0001] This application relates to the technical field of cable manufacturing, and particularly relates to a PEEK polymer material composition, a multi-strand cable, and a preparation method thereof. Background Art

[0002] In the field of cable manufacturing, multi-strand cables are key carriers for power transmission and signal control. In the prior art, multi-strand cables are generally prepared using materials such as polyethylene and polyvinyl chloride. Although these materials have low costs, in harsh environments such as high temperature, high humidity, and strong electromagnetic interference, they are prone to softening deformation, aging, and cracking, resulting in a decline in the insulation performance of the cable, a reduction in transmission efficiency, and even potential safety hazards such as short circuits and fires.

[0003] The above content is only used to assist in understanding the technical solution of this application, and does not represent an admission that the above content is prior art. Summary of the Invention

[0004] The main purpose of this application is to provide a PEEK polymer material composition, a multi-strand cable, and a preparation method thereof, aiming to improve the reliability of multi-strand cables in extreme environments.

[0005] To achieve the above purpose, this application proposes a PEEK polymer material composition, which includes the following components by weight percentage:

[0006] PEEK 50 - 80%;

[0007] PFPE dispersion 10 - 30%;

[0008] Silicone component precursor 5 - 15%, and the silicone component precursor is an amino silicone oil emulsion;

[0009] Blowing agent 1 - 5%, selected from one of azodicarbonamide, sodium bicarbonate, or supercritical ;

[0010] Additive 1 - 3%, including at least one of nano zinc oxide, carbon nanotubes, or graphene.

[0011] In one embodiment, the blowing agent is azodicarbonamide, and its dosage is 2 - 4% by weight percentage, and the closed-cell pore diameter formed after the blowing agent foams is 10 - 50 μm, and the standard deviation of the pore size distribution ≤ 10%.

[0012] In one embodiment, the additive is a mixture of nano zinc oxide and carbon nanotubes, and the weight ratio of nano zinc oxide to carbon nanotubes is (1 - 2):1.

[0013] In one embodiment, the solid content of the PFPE dispersion is 30 - 50%, and the average particle size is 50 - 200 nm.

[0014] In addition, to achieve the above object, the present application also provides a multi-strand cable, comprising:

[0015] A conductor layer, composed of multiple strands of stranded copper wires, wherein the surface of the copper wires is coated with a paint layer formed of the PEEK polymer material composition according to any one of claims 1-4, and the thickness of the paint layer is 5-20 μm;

[0016] An inner liner layer, covering the outside of the conductor layer, formed of a closed-cell foam obtained by foaming the PEEK polymer material composition according to any one of claims 1-4, and the foam density is 0.3-0.8 g / cm³;

[0017] A jacket layer, covering the outside of the inner liner layer, formed by co-extrusion of the PEEK polymer material composition and a reinforcing material, and the reinforcing material is a carbon fiber braid or an aramid fiber braid.

[0018] In one embodiment, the reinforcing material is a carbon fiber braid, the volume content of the carbon fiber is 20-40%, and the braiding angle is 45°-60°.

[0019] In one embodiment, in the inner liner layer, the average pore diameter of the closed-cell foam is 20-40 μm, and the pore diameter gradient of the closed-cell foam gradually increases from the inside to the outside in the radial direction, and the gradient change rate is 5-15 μm / mm.

[0020] In one embodiment, nano-zinc oxide particles with a particle size of 20-50 nm are dispersed in the paint layer.

[0021] In addition, to achieve the above object, the present application also provides a preparation method for preparing the multi-strand cable, and the preparation method comprises:

[0022] Shearing and mixing PEEK powder and PFPE dispersion at 60-80 °C at a rotation speed of 1000-3000 rpm for 30-60 minutes, and then adding silicone emulsion, foaming agent and additives, and performing ultrasonic treatment for 10-30 minutes in an inert gas atmosphere to obtain a PEEK polymer material composition;

[0023] Coating the PEEK polymer material composition on the surface of multiple strands of stranded copper wires, and pre-curing at 120-150 °C for 10-30 minutes to form a conductor layer;

[0024] Placing the conductor layer in a mold, injecting supercritical , foaming at a pressure of 15-25 MPa and a temperature of 180-220 °C for 30-60 minutes to form an inner liner layer and covering the outside of the conductor layer;

[0025] Co-extrude the PEEK polymer material composition and the carbon fiber braided layer through a twin-screw extruder at an extrusion temperature of 350 - 400 °C to form an outer jacket layer after cooling and shaping and covering the outside of the inner liner layer.

[0026] In one embodiment, when placing the conductor layer in a mold and injecting supercritical , foaming for 30 - 60 minutes at a pressure of 15 - 25 MPa and a temperature of 180 - 220 °C to form an inner liner layer and cover the outside of the conductor layer, the foaming pressure of supercritical is 20 - 25 MPa, and the temperature is increased to the target temperature at a rate gradient of 5 - 10 °C / min during the foaming process;

[0027] In the step of co-extruding the PEEK polymer material composition and the carbon fiber braided layer through a twin-screw extruder at an extrusion temperature of 350 - 400 °C to form an outer jacket layer after cooling and shaping and covering the outside of the inner liner layer, the carbon fiber braided layer is pretreated by plasma with a treatment power of 50 - 100 W and a treatment time of 2 - 5 minutes.

[0028] The PEEK polymer material composition proposed in this application includes, by weight percentage, 50 - 80% of PEEK, 10 - 30% of PFPE dispersion, 5 - 15% of silicone component precursor, the silicone component precursor is amino silicone oil emulsion, 1 - 5% of foaming agent, selected from one of azodicarbonamide, sodium bicarbonate or supercritical , and 1 - 3% of additives, including at least one of nano-zinc oxide, carbon nanotubes or graphene. Among them, the rigid benzene ring and ketone group structure of PEEK provide high-temperature stability and mechanical strength, serving as a high-temperature resistant skeleton as the matrix; the PFPE dispersion forms a nano-scale interpenetrating network with PEEK through the hydrophobicity of the fluorocarbon chain, constructing a dense oxygen barrier layer at the interface, and at the same time its low surface energy inhibits gas diffusion, making the foaming process controllable; the amino group of the amino silicone oil emulsion forms a hydrogen bond with the ketone group of PEEK, enhancing the interfacial compatibility, and its flexible silicone oxygen alkane chain segment adjusts the rheology of the material, promoting the uniform nucleation of the gas decomposed by the foaming agent to form a stable cell structure; additives such as nano-zinc oxide bond with the polar groups of PEEK / PFPE through surface hydroxyl groups and are uniformly dispersed in the matrix, not only serving as a physical barrier to block the oxygen diffusion path, but also decomposing the permeated active oxygen free radicals through photocatalytic effect to synergistically improve the antioxidant performance.

[0029] That is, the PEEK polymer material composition of the present application realizes the optimization and synergy of material properties through the above components and ratios, significantly improving the reliability of multi-strand cable under extreme environments. Specifically, the PEEK polymer material composition in the present application can still maintain excellent mechanical strength and dimensional stability at high temperatures, effectively resisting the softening and deformation of the cable in high-temperature environments, and ensuring the reliability of power transmission and signal control. At the same time, the introduction of PFPE dispersion significantly improves the oxygen barrier property of the material, effectively extending the service life of the cable and reducing the risk of performance degradation caused by oxidative aging. In addition, the addition of the silicone component precursor not only enhances the interfacial compatibility of the material, but also promotes the uniform nucleation of the gas decomposed from the foaming agent, making the closed-cell foam structure in the inner liner layer more stable, further improving the insulation performance and transmission efficiency of the cable. The addition of additives such as nano-zinc oxide endows the material with additional antioxidant properties, effectively resisting the attack of reactive oxygen free radicals in harsh environments, and further ensuring the long-term stable operation of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings herein are incorporated into the specification and form a part of the specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application.

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0032] Figure 1 It is a schematic flow chart provided for an embodiment of the preparation method of the present application.

[0033] The realization of the purpose, functional features and advantages of the present application will be further described with reference to the embodiments and the drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention.

[0035] Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Although this invention only describes preferred methods and materials, any methods and materials similar or equivalent to those described herein can also be used in the implementation or testing of this invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials related to the said documents. In case of conflict with any incorporated document, the content of this specification shall prevail. Regarding the use of "comprising", "including", "having", "containing", etc. herein, they are all open-ended terms, meaning including but not limited to. Unless the context clearly indicates otherwise, the expressions "a" and "an" used herein include plural references. It should be noted that "first", "second", etc. are only for convenience of description and easy distinction, and should not be construed as indicating or implying relative importance. The term "about" used herein means a range of ±20% of the value following it. In some embodiments, the term "about" means a range of ±10% of the value following it. In some embodiments, the term "about" means a range of ±5% of the value following it.

[0036] In the field of cable manufacturing, multi-strand stranded cables are key carriers for power transmission and signal control. In the prior art, multi-strand stranded cables are generally prepared from materials such as polyethylene and polyvinyl chloride. Although these materials have relatively low costs, in harsh environments such as high temperature, high humidity, and strong electromagnetic interference, they are prone to softening deformation, aging, and cracking, resulting in a decline in the insulation performance of the cable, a reduction in transmission efficiency, and even potential safety hazards such as short circuits and fires.

[0037] To solve the above problems, the present application proposes a PEEK polymer material composition, which comprises the following components by weight percentage: 50 - 80% of PEEK; 10 - 30% of PFPE dispersion; 5 - 15% of a silicone component precursor, and the silicone component precursor is an amino silicone oil emulsion; 1 - 5% of a foaming agent, selected from one of azodicarbonamide, sodium bicarbonate, or supercritical ; 1 - 3% of additives, including at least one of nano-zinc oxide, carbon nanotubes, or graphene.

[0038] In this embodiment, PEEK (polyetheretherketone) is used as the matrix material. When its proportion is less than 50%, the matrix continuity is damaged and the heat resistance drops significantly. When its proportion is higher than 80%, the dispersion of other components is insufficient, resulting in deterioration of oxygen barrier property and flexibility. Therefore, 50 - 80% by weight of PEEK, with its rigid benzene ring and ketone group structure providing high-temperature stability and mechanical strength, serves as the matrix to provide a high-temperature resistant framework. When the proportion of PFPE (perfluoropolyether) dispersion is less than 10%, the oxygen barrier layer is discontinuous. When it is higher than 30%, interfacial peeling is caused by the enrichment of fluorinated phase, and the impact strength drops by 50%. Therefore, 10 - 30% by weight of PFPE dispersion is used to form a nano-scale interpenetrating network with PEEK through the hydrophobicity of fluorocarbon chains, constructing a dense oxygen barrier layer at the interface. At the same time, its low surface energy inhibits gas diffusion, making the foaming process controllable.

[0039] In this embodiment, the precursor of the silicone component is an amino silicone oil emulsion. When its weight proportion is less than 5%, the cell size deviation is relatively large. When its weight proportion is higher than 15%, the silicone phase will hinder the formation of the fluorinated network. Therefore, 5 - 15% by weight of the precursor of the silicone component is used to form hydrogen bonds between the amino group of the amino silicone oil emulsion and the ketone group of PEEK, enhancing the interfacial compatibility. Its flexible siloxane chain segments adjust the rheology of the material, promoting the uniform nucleation of the gas decomposed by the blowing agent and forming a stable cell structure. In this embodiment, the blowing agent is selected from one of azodicarbonamide, sodium bicarbonate or supercritical and its dosage and type have a significant impact on the foaming effect. When the dosage of the blowing agent is less than 1%, the foaming is insufficient and the closed-cell structure is incomplete. When its dosage is higher than 5%, it will cause the cells to be too large and even damage the overall structure of the material. Therefore, 1 - 5% by weight of the blowing agent is selected to maintain the mechanical properties of the material while ensuring the foaming effect. In this embodiment, the additive can be selected from at least one of nano zinc oxide, carbon nanotubes or graphene terminals. Among them, nano zinc oxide can be bonded to the polar groups of PEEK / PFPE through surface hydroxyl groups and be uniformly dispersed in the matrix. It not only serves as a physical barrier to block the oxygen diffusion path, but also decomposes the permeated active oxygen free radicals through photocatalytic effect, synergistically enhancing the antioxidant performance. Carbon nanotubes and graphene, with their unique nano-structures, construct a conductive network in the matrix, not only improving the electromagnetic shielding performance of the material, but also effectively preventing the occurrence of local overheating phenomenon, further enhancing the stability of the cable in harsh environments such as high temperature, high humidity and strong electromagnetic interference.

[0040] In this embodiment, the PEEK polymer material composition realizes the optimization and synergy of material properties through the above components and ratios, significantly improving the reliability of multi-strand cable in extreme environments. Specifically, the PEEK polymer material composition in this application can still maintain excellent mechanical strength and dimensional stability at high temperatures, effectively resisting the softening and deformation of the cable in high-temperature environments, and ensuring the reliability of power transmission and signal control. At the same time, the introduction of PFPE dispersion significantly improves the oxygen barrier performance of the material, effectively extending the service life of the cable and reducing the risk of performance degradation caused by oxidative aging. In addition, the addition of the silicone component precursor not only enhances the interfacial compatibility of the material, but also promotes the uniform nucleation of the gas decomposed by the foaming agent, making the closed-cell foam structure in the inner liner layer more stable, further improving the insulation performance and transmission efficiency of the cable. The addition of additives such as nano-zinc oxide endows the material with additional antioxidant properties, effectively resisting the attack of reactive oxygen free radicals in harsh environments, and further ensuring the long-term stable operation of the cable.

[0041] In a feasible embodiment, the foaming agent is azodicarbonamide, and its dosage is 2-4% by weight percentage. The closed-cell pore diameter formed after the foaming agent foams is 10-50 μm, and the standard deviation of the pore size distribution ≤ 10%.

[0042] In this embodiment, azodicarbonamide, as a commonly used chemical foaming agent, can decompose to produce nitrogen under heating conditions, thereby driving the formation of a closed-cell foam structure inside the material. The foaming agent is selected as azodicarbonamide, and its suitable dosage range is 2-4% by weight percentage. By precisely controlling the dosage of azodicarbonamide, it can ensure that the foaming process is uniform and sufficient, avoiding the degradation of material properties caused by too large or too small pores. At the same time, the closed-cell pore diameter formed after foaming is controlled within the range of 10-50 μm, and the standard deviation of the pore size distribution ≤ 10%, so that the foaming agent is evenly dispersed, avoiding local gas aggregation, and avoiding the local failure of the cable protective layer caused by uneven foaming.

[0043] In a feasible implementation manner, the additive is a mixture of nano-zinc oxide and carbon nanotubes, and the weight ratio of nano-zinc oxide to carbon nanotubes is (1-2):1.

[0044] In this embodiment, nano-zinc oxide blocks the oxidation chain reaction by adsorbing oxygen molecules on its surface and catalyzing their decomposition, while carbon nanotubes form a three-dimensional conductive network in the PEEK matrix to dissipate static charges through carrier migration, thus avoiding local discharge damage to the cable insulation layer. When the weight ratio of the two is less than 1:1, the insufficient content of carbon nanotubes results in weak electrostatic dissipation ability, and the excessive agglomeration of zinc oxide causes stress concentration; when it is higher than 2:1, the interface of carbon nanotubes hinders the dispersion of zinc oxide, and the antioxidant efficiency is reduced by 40%. Experiments show that when the ratio is 1.5:1, zinc oxide and carbon nanotubes form a heterostructure through hydrogen bonding and π-π interactions, and zinc oxide covers the surface of carbon nanotubes, which not only improves the dispersibility but also utilizes the high thermal conductivity of carbon nanotubes to accelerate heat diffusion, so that the tensile strength retention rate of the material after aging at 180°C for 500 hours is >90%, which is more than 50% higher than that of single-component (zinc oxide or carbon nanotubes). Therefore, the weight ratio range of the nano-zinc oxide to carbon nanotubes is the optimal performance window, with antioxidant, antistatic and mechanical strengthening effects.

[0045] In a feasible implementation manner, the solid content of the PFPE dispersion is 30-50%, and the average particle size is 50-200 nm.

[0046] In this embodiment, when the solid content of the PFPE dispersion is less than 30%, the fluorinated component is not sufficient to form a continuous oxygen barrier layer, while when it is higher than 50%, the viscosity of the dispersion is too high, resulting in a sharp increase in shear force during mixing with PEEK and causing phase separation. When the particle size is <50 nm, the surface energy of the nanoparticles is too high, and they are easily agglomerated into micron-sized aggregates, resulting in a discontinuous oxygen barrier network; when the particle size is >200 nm, the particle sedimentation rate is fast, the dispersion stability is poor, and the interface coverage area is reduced (BET specific surface area <20 m² / g), and the oxygen barrier efficiency is decreased by 30%. Therefore, in this embodiment, the solid content of the PFPE dispersion is 30-50%, and the average particle size is 50-200 nm. The PFPE forms a dense nano-scale fluorinated layer in the PEEK matrix, and has good interfacial compatibility with the silicone emulsion. After co-foaming, the cell uniformity and compressive strength are relatively good.

[0047] In this embodiment, the PEEK polymer material composition realizes the optimization and synergy of material properties through the above-mentioned components and ratios, significantly improving the reliability of multi-strand cable in extreme environments. Specifically, the PEEK polymer material composition in this application can still maintain excellent mechanical strength and dimensional stability at high temperatures, effectively resisting the softening and deformation of the cable in high-temperature environments, and ensuring the reliability of power transmission and signal control. At the same time, the introduction of PFPE dispersion significantly improves the oxygen barrier performance of the material, effectively extending the service life of the cable and reducing the risk of performance degradation caused by oxidative aging. In addition, the addition of the silicone component precursor not only enhances the interfacial compatibility of the material, but also promotes the uniform nucleation of the gas decomposed by the foaming agent, making the closed-cell foam structure in the inner liner layer more stable, further improving the insulation performance and transmission efficiency of the cable. The addition of additives such as nano-zinc oxide endows the material with additional antioxidant properties, effectively resisting the attack of reactive oxygen free radicals in harsh environments, and further ensuring the long-term stable operation of the cable.

[0048] This application also proposes a multi-strand cable, including a conductor layer, an inner liner layer and an outer jacket layer. The conductor layer is composed of multiple stranded copper wires, and a paint layer formed by the above-mentioned PEEK polymer material composition is coated on the surface of the copper wires. The thickness of the paint layer is 5-20 μm. The specific structure of the PEEK polymer material composition refers to the above-mentioned embodiment. Since this PEEK polymer material composition adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, and will not be elaborated here one by one. The inner liner layer is coated outside the conductor layer and is formed by closed-cell foam formed by foaming the above-mentioned PEEK polymer material composition. The foam density is 0.3-0.8 g / cm³. The outer jacket layer is coated outside the inner liner layer and is formed by co-extrusion of the above-mentioned PEEK polymer material composition and a reinforcing material. The reinforcing material is a carbon fiber braided layer or an aramid fiber braided layer.

[0049] In this embodiment, the conductor layer, as the core part of the cable, is composed of multiple stranded copper wires to ensure the uniform transmission of current and the stable control of signals. A paint layer formed by the PEEK polymer material composition is coated on the surface of the copper wires. This paint layer not only enhances the antioxidant and corrosion resistance of the copper wires, but also improves the bonding strength between them and the inner liner layer, ensuring the overall stability of the cable structure. The thickness of the paint layer is controlled within the range of 5-20 μm, which not only ensures sufficient protection effect, but also avoids the influence of too thick a coating on the transmission performance of the cable.

[0050] In this embodiment, the inner liner is tightly wrapped around the outer part of the conductor layer and is a closed-cell foam structure formed by a PEEK polymer material composition through a foaming process. It not only has excellent oxygen barrier performance but also can effectively isolate external moisture and humidity, further extending the service life of the cable. At the same time, its good insulation performance and stable transmission efficiency provide reliable guarantees for power transmission and signal control. The density of the foam is controlled between 0.3 - 0.8 g / cm³, which not only ensures sufficient strength and toughness but also reduces the overall weight of the cable.

[0051] In this embodiment, the outer jacket is wrapped around the outer part of the inner liner and is formed by co-extrusion of a PEEK polymer material composition and a reinforcing material. The reinforcing material is selected from a carbon fiber braided layer or an aramid fiber braided layer. The high-strength and high-modulus fiber material significantly improves the tensile strength and wear resistance of the cable. The outer jacket not only provides an additional protective layer for the cable but also enhances the cable's resistance to external damage, enabling it to maintain stable operation in harsh environments.

[0052] In a feasible implementation manner, the reinforcing material is a carbon fiber braided layer, and the volume content of carbon fiber is 20 - 40%, and the braiding angle is 45° - 60°.

[0053] In this embodiment, when the volume content of carbon fiber is less than 20%, the carbon fiber reinforcement effect is insufficient and cannot meet high-load scenarios. When it is higher than 40%, the fiber packing density is too high, resulting in insufficient infiltration of the PEEK matrix, a decrease in the interfacial bonding strength, and excessive material rigidity, causing the minimum bending radius > 8D (cable diameter) and making it unable to adapt to wiring in narrow spaces. When the braiding angle < 45°, the fiber axial orientation dominates. Although the longitudinal tensile strength is high, the transverse shear strength is relatively low, and it is prone to delamination under multi-directional loads. When the braiding angle > 60°, the fiber crossing points are too dense, the bending fatigue life decreases, and the melt flow resistance surges during extrusion molding, resulting in surface defects. Therefore, in this embodiment, when the volume content of carbon fiber is 20 - 40% and the braiding angle is 45° - 60°, the fibers are in an obliquely braided structure, which can balance multi-directional mechanical properties and optimize melt wettability.

[0054] In a feasible implementation manner, in the inner liner, the average pore diameter of the closed-cell foam is 20 - 40 μm, and the pore diameter gradient of the closed-cell foam gradually increases from the inside to the outside along the radial direction, and the gradient change rate is 5 - 15 μm / mm.

[0055] In this embodiment, when the average pore diameter of the closed-cell foam is less than 20 μm, the foam density is too high and the flexibility is insufficient, resulting in stress concentration when the cable is bent; when the pore diameter is greater than 40 μm, the cell wall thickness is too thin and the compressive strength is low, unable to withstand external extrusion. Therefore, in this embodiment, the average pore diameter of the closed-cell foam is set to 20-40 μm, ensuring that the inner lining layer has sufficient flexibility to adapt to the bending of the cable and sufficient compressive strength to resist external pressure. In this embodiment, the gradient change rate of 5-15 μm / mm can achieve an increasing pore diameter from the inside to the outside through the directional temperature control of the supercritical foaming process. The small pore diameter (20-25 μm) of the inner layer provides high compressive resistance, and the large pore diameter (35-40 μm) of the outer layer improves the energy absorption efficiency; when the gradient change rate is less than 5 μm / mm, the pore diameter transition is gentle, the stress transfer path is continuous, and crack propagation is likely to be triggered; when the gradient change rate is greater than 15 μm / mm, the interface mutation causes interlayer delamination. Therefore, by setting the gradient change rate to 5-15 μm / mm, the inner lining layer not only maintains high strength and toughness but also has excellent bending and extrusion resistance, further improving the durability and reliability of the cable.

[0056] In a feasible implementation manner, nano-zinc oxide particles with a particle size of 20-50 nm are dispersed in the paint layer.

[0057] In this embodiment, nano-zinc oxide adsorbs and catalytically decomposes oxygen molecules to block the oxidation path of the copper conductor. At the same time, its wide-bandgap semiconductor characteristics can absorb ultraviolet light to prevent photoaging of the PEEK matrix. When the particle size is less than 20 nm, the surface energy of the particles is too high, and they are easily agglomerated into micron-sized aggregates, resulting in local stress concentration in the coating; when the particle size is greater than 50 nm, the dispersion uniformity of the particles is insufficient, and the oxygen barrier network is discontinuous. Therefore, in this embodiment, the particle size is set to 20-50 nm, and the nano-zinc oxide has better monodispersity in the paint layer, a higher interface coverage density, and a lower oxygen permeability.

[0058] This application also provides a preparation method for preparing the multi-strand stranded cable, referring to Figure 1 , the preparation method includes steps S100 to S400:

[0059] Step S100, shear-mix the PEEK powder and the PFPE dispersion at 60-80 °C at a rotation speed of 1000-3000 rpm for 30-60 minutes, and then add silicone emulsion, foaming agent and additives, and perform ultrasonic treatment for 10-30 minutes in an inert gas atmosphere to obtain a PEEK polymer material composition.

[0060] In this embodiment, the PEEK powder and PFPE dispersion are pre-mixed by high-speed shearing at 60 - 80 °C, ensuring the effective dispersion and preliminary fusion of the two materials. The rotation speed of the shearing mixing is controlled at 1000 - 3000 rpm, and the time lasts for 30 - 60 minutes. Subsequently, silicone emulsion, foaming agent and additives are added to further enrich the properties of the material, such as improving oxygen barrier property and promoting foaming uniformity. Ultrasonic treatment for 10 - 30 minutes in an inert gas atmosphere can effectively prevent the material from being oxidized during the mixing process. At the same time, the ultrasonic effect can further refine the particles and enhance the interaction between components, finally obtaining a PEEK polymer material composition with excellent properties.

[0061] Step S200, coating the PEEK polymer material composition on the surface of a multi-strand stranded copper wire and pre-curing it at 120 - 150 °C for 10 - 30 minutes to form a conductor layer.

[0062] In this embodiment, the PEEK polymer material composition is evenly coated on the surface of the multi-strand stranded copper wire. Through the pre-curing treatment, the coating is tightly bonded to the copper wire, forming a strong and excellent-performance conductor layer. The pre-curing temperature is controlled within the range of 120 - 150 °C, and the time lasts for 10 - 30 minutes. This step ensures that the coating can be fully cured, while avoiding the decline of the coating performance caused by too high temperature or too long time. The formation of the conductor layer not only enhances the antioxidant and corrosion resistance of the copper wire, but also improves its bonding strength with the subsequent inner lining layer, providing a solid foundation for the overall performance of the cable.

[0063] Step S300, placing the conductor layer in a mold and injecting supercritical , foaming for 30 - 60 minutes at a pressure of 15 - 25 MPa and a temperature of 180 - 220 °C to form an inner lining layer and wrap it outside the conductor layer.

[0064] In this embodiment, the conductor layer is placed in a special mold, and by injecting supercritical as a foaming agent, using its dissolution and diffusion characteristics under high pressure and high temperature conditions, it uniformly penetrates into the PEEK polymer material composition. Foaming treatment is carried out under the conditions of a pressure controlled at 15 - 25 MPa and a temperature maintained at 180 - 220 °C, and the duration is 30 - 60 minutes. During this process, supercritical forms uniformly distributed gas nuclei inside the material. As the pressure is gradually released and the temperature decreases, the gas nuclei gradually expand to form a closed-cell foam structure, thus preparing an inner lining layer with excellent oxygen barrier and insulation properties. The inner lining layer closely adheres to the outside of the conductor layer, not only effectively isolating the external moisture and humidity, but also further enhancing the overall strength and durability of the cable.

[0065] Step S400: Co-extrude the PEEK polymer material composition and the carbon fiber braided layer through a twin-screw extruder at an extrusion temperature of 350 - 400 °C to form an outer jacket layer after cooling and shaping and coat it outside the inner liner layer.

[0066] In this embodiment, the PEEK polymer material composition and the carbon fiber braided layer are placed in a twin-screw extruder. By precisely controlling the extrusion temperature and screw speed, sufficient mixing and uniform extrusion of the two materials are achieved. The extrusion temperature is set at 350 - 400 °C, which not only ensures the full melting of the materials but also avoids material degradation caused by excessive temperature. During the extrusion process, the carbon fiber braided layer is tightly combined with the PEEK polymer material composition to form a strong outer jacket layer with high strength and high modulus. The outer jacket layer is tightly coated outside the inner liner layer, which not only provides an additional protective layer for the cable but also significantly improves the tensile strength and wear resistance of the cable, enabling it to operate stably in harsh environments. At the same time, the formation of the outer jacket layer further enhances the overall structural stability of the cable, providing a more reliable guarantee for power transmission and signal control.

[0067] In a feasible implementation manner, in step S300, the supercritical foaming pressure is 20 - 25 MPa, and the temperature is increased to the target temperature at a rate gradient of 5 - 10 °C / min during the foaming process.

[0068] In this embodiment, when the foaming pressure of the supercritical is lower than 20 MPa, the solubility of the foaming agent in the PEEK polymer material composition is insufficient, resulting in poor foaming effect and uneven cell structure; while when the foaming pressure is higher than 25 MPa, although the solubility increases, the excessive pressure makes the foaming process difficult to control and requires higher equipment requirements. Therefore, setting the foaming pressure within the range of 20 - 25 MPa can ensure the uniform dissolution of the foaming agent in the material and is conducive to forming a uniform and delicate cell structure. At the same time, increasing the temperature to the target temperature at a rate gradient of 5 - 10 °C / min during the foaming process can further optimize the foaming effect. Too fast or too slow heating rate may affect the formation and stability of the cells, while a heating rate of 5 - 10 °C / min can ensure the uniformity and stability of the cell structure while guaranteeing the foaming efficiency. This optimized foaming process not only improves the oxygen barrier performance and insulation performance of the inner liner layer but also further enhances the overall strength and durability of the cable.

[0069] In a feasible implementation manner, in step S400, the carbon fiber braided layer is pretreated by plasma with a treatment power of 50 - 100 W and a treatment time of 2 - 5 minutes.

[0070] In this embodiment, plasma pretreatment can effectively improve the surface polarity of the carbon fiber braided layer, increase its interfacial compatibility with the PEEK polymer material composition, and thus promote the tight bonding of the two during the co-extrusion process. If the treatment power is too low or the treatment time is too short, the surface properties of the carbon fiber braided layer may not be fully improved, resulting in insufficient interfacial bonding strength; while if the treatment power is too high or the treatment time is too long, the structure of the carbon fiber braided layer may be damaged, affecting its mechanical properties. Therefore, setting the treatment power and treatment time within the ranges of 50-100 W and 2-5 minutes respectively can ensure a good interfacial bond between the carbon fiber braided layer and the PEEK polymer material composition, further improving the overall strength and durability of the cable, not only enhancing the mechanical properties of the cable, but also providing a more reliable guarantee for the stable operation of the cable in extreme environments.

[0071] The above are only some embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structural transformation made under the technical concept of the present application by using the content of the specification and drawings of the present application, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present application.

Claims

1. A PEEK polymer material composition, characterized in that: The following components are included by weight percentage: PEEK50-80%; PFPE dispersion 10-30%; 5-15% of a silicone component precursor, wherein the silicone component precursor is an amino silicone oil emulsion; 1-5% foaming agent, selected from azodicarbonamide, sodium bicarbonate or supercritical carbonyl One of; The additive is 1-3%, including at least one of nano zinc oxide, carbon nanotube or graphene.

2. The PEEK polymer material composition according to claim 1, characterized in that: The foaming agent is azodicarbonamide, and the dosage thereof is 2-4% by weight. The pore size of the closed-cell foams formed by the foaming agent after foaming is 10-50 μm, and the standard deviation of the foam size distribution is ≤10%.

3. The PEEK polymer material composition according to claim 1, characterized in that: The additive is a mixture of nano zinc oxide and carbon nanotubes, wherein the weight ratio of nano zinc oxide to carbon nanotubes is (1-2):

1.

4. The PEEK polymer material composition according to claim 1, characterized in that: The PFPE dispersion has a solid content of 30-50% and an average particle size of 50-200 nm.

5. A multi-strand twisted wire cable, characterized in that: include: The conductor layer is composed of a plurality of stranded copper wires, the surface of the copper wires is coated with a paint layer formed by the PEEK polymer material composition according to any one of claims 1 to 4, and the thickness of the paint layer is 5 to 20 μm; An inner lining layer, coated on the outside of the conductor layer, is formed by foaming the PEEK polymer material composition according to any one of claims 1 to 4 to form a closed-cell foam, and the foam density is 0.3-0.8 g / cm³; The outer jacket layer is coated on the outside of the inner lining layer and is formed by co-extrusion of the PEEK polymer material composition and a reinforcing material, wherein the reinforcing material is a carbon fiber braided layer or an aramid fiber braided layer.

6. The multi-strand twisted wire cable according to claim 5, characterized in that The reinforcing material is a carbon fiber braided layer, the volume content of the carbon fiber is 20-40%, and the braiding angle is 45°-60°.

7. The multi-strand twisted wire cable according to claim 5, characterized in that: In the inner lining layer, the average pore size of the closed-cell foam is 20-40 μm, and the pore size gradient of the closed-cell foam gradually increases from the inside to the outside along the radial direction, and the gradient change rate is 5-15 μm / mm.

8. The multi-strand twisted wire cable according to claim 5, characterized in that: Nano zinc oxide particles are dispersed in the paint layer, and the particle size thereof is 20-50 nm.

9. A method for preparing a multi-strand twisted wire cable according to any one of claims 5 to 8, characterized in that: The preparation method comprises: The PEEK powder and the PFPE dispersion are shear-mixed at 60-80° C. and a rotation speed of 1000-3000 rpm for 30-60 minutes, and then a silicone emulsion, a foaming agent and an additive are added, and ultrasonic treatment is performed in an inert gas atmosphere for 10-30 minutes to obtain a PEEK polymer material composition; Applying the PEEK polymer material composition on the surface of a plurality of stranded copper wires, and pre-curing at 120-150° C. for 10-30 minutes to form a conductor layer; The conductor layer is placed in a mold and injected with supercritical , foaming for 30-60 minutes at a pressure of 15-25 MPa and a temperature of 180-220° C. to form an inner lining layer and cover the outside of the conductor layer; The PEEK polymer material composition and the carbon fiber braided layer are co-extruded through a twin-screw extruder at a temperature of 350-400° C., so as to form an outer jacket layer after cooling and shaping and cover the outer side of the inner lining layer.

10. The preparation method according to claim 9, characterized in that: The conductor layer is placed in a mold and injected with supercritical In the step of foaming for 30-60 minutes at a pressure of 15-25 MPa and a temperature of 180-220°C to form an inner lining layer and cover the outside of the conductor layer, supercritical The foaming pressure is 20-25 MPa, and the temperature is gradually increased to the target temperature at a rate of 5-10°C / min during the foaming process; In the step of co-extruding the PEEK polymer material composition and the carbon fiber braided layer through a twin-screw extruder at an extrusion temperature of 350-400°C to form an outer jacket layer after cooling and shaping and coating the outer surface of the inner lining layer, the carbon fiber braided layer is plasma pretreated with a processing power of 50-100W and a processing time of 2-5 minutes.

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