CN112151206B - Carbon fiber composite core wire and preparation method thereof - Google Patents
Carbon fiber composite core wire and preparation method thereof Download PDFInfo
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B5/00—Non-insulated conductors or conductive bodies characterised by their form
- H01B5/08—Several wires or the like stranded in the form of a rope
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/04—Flexible cables, conductors, or cords, e.g. trailing cables
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
- H01B7/2806—Protection against damage caused by corrosion
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
- H01B9/005—Power cables including optical transmission elements
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Reinforced Plastic Materials (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
- Ropes Or Cables (AREA)
Abstract
The invention discloses a carbon fiber composite core wire and a preparation method thereof, belonging to the technical field of transmission line wires, wherein the carbon fiber composite core wire, a glass fiber layer and a soft aluminum molded line layer are sequentially arranged from inside to outside; the soft aluminum profile layer is formed by twisting a plurality of trapezoidal soft aluminum profiles; the carbon fiber composite core rod is prepared from the following raw materials in parts by weight: 18-25 parts of carbon fiber, 3-5 parts of glass fiber, 5-8 parts of sisal fiber and 230 parts of dipping solution. The carbon fiber composite core rod has good comprehensive performance: the tensile strength is 2613MPa-2638MPa, the elastic modulus is 137GPa-145GPa, the mandrel is coiled for 1 circle on a cylinder body with the diameter of 55D at the coiling speed of not more than 3r/min, and the mandrel does not crack or break. The surface layer is not cracked and the linear expansion coefficient is 1.57 multiplied by 10 in a torsion 360-degree test‑6/℃‑1.52×10‑6/℃。
Description
Technical Field
The invention relates to the technical field of transmission line leads, in particular to a carbon fiber composite core lead and a preparation method thereof.
Background
For a long time, the steel-cored aluminum strand is mainly adopted in domestic power transmission lines, the current-carrying capacity is small, the line loss is large, the inner bearing wire core is a galvanized steel core, the linear expansion coefficient is large, electrochemical corrosion is easy to occur with an outer aluminum conductor, and long-term operation of the wire is not facilitated. The carbon fiber composite core wire is made by replacing a steel core in a traditional steel-cored aluminum strand with a composite material core, is a wire for overhead transmission lines with a brand-new concept, and is innovative application of a high-performance composite material in transmission wires. The advanced composite material core wire has the excellent performances of high strength, corrosion resistance, high conductivity, large current-carrying capacity, small linear expansion coefficient, small sag, light weight, long service life and the like, and can effectively meet the higher requirements of energy conservation, safety, environmental protection and economy in the field of power transmission and transformation. The traditional carbon fiber composite core rod is formed by embedding glass fibers and carbon fibers, the glass fibers are brittle, and the carbon fibers are easily damaged, so that the mechanical property of the carbon fiber composite core needs to be improved, and in addition, the linear expansion coefficient and the sag performance of the carbon fiber composite core need to be improved.
The patent document with publication number CN109378123A discloses an ultra-soft multi-strand combined carbon fiber composite core wire and a manufacturing process thereof, which comprises a core rod and a conductive metal layer wrapped outside the core rod, wherein the core rod comprises a group of carbon fiber composite cores with circular cross sections, the axes of the carbon fiber composite cores in the carbon fiber composite core group are arranged in parallel, the axis connecting lines of the carbon fiber composite cores positioned at the periphery in the carbon fiber composite core group form a regular polygon structure, the periphery of the carbon fiber composite core group is further wrapped with an aluminum foil or tin foil wrapping layer on the outer layer of the carbon fiber composite core group, and the inner layer of the aluminum foil or tin foil wrapping layer is provided with a glass fiber reinforced layer with viscosity; the conductive metal layer comprises an aluminum extrusion coating and an aluminum strand layer which are sequentially wrapped on the periphery of the coating. The lead overcomes the defects of the prior art, the bending and winding performance of the core rod is improved, the strength is improved, the resistance to humidity, heat, ozone and ultraviolet aging is improved, the use stability and the reliability are obviously improved, and the core rod can be prefabricated as an independent product, so that the production process is simplified.
Patent document CN107358995A discloses a large-section carbon fiber composite core semi-hard aluminum conductor, which comprises a carbon fiber composite core rod and a plurality of semi-hard aluminum wire layers stranded outside the carbon fiber composite core rod, wherein the carbon fiber composite core rod comprises a composite material inner core and a glass fiber composite material layer for coating the composite material inner core.
The core rod is high in brittleness and poor in toughness, is easy to crack or break in a long-term use process, seriously influences the safe operation of a power transmission line, and is high in linear expansion coefficient and large in sag.
Disclosure of Invention
In view of this, the invention provides a carbon fiber composite core wire and a preparation method thereof.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a carbon fiber composite core wire comprises a carbon fiber composite core rod, a glass fiber layer and a soft aluminum molded line layer from inside to outside in sequence; the soft aluminum molded line layer is formed by twisting a plurality of trapezoidal soft aluminum molded lines.
Further, the carbon fiber composite core rod is prepared from the following raw materials in parts by weight: 18-25 parts of carbon fiber, 3-5 parts of glass fiber, 5-8 parts of sisal fiber and 230 parts of dipping solution.
Further, the dipping solution is prepared from the following raw materials in parts by weight: 8-15 parts of phenolic resin, 30-40 parts of epoxy resin, 15-20 parts of curing agent, 65-78 parts of styrene-butadiene latex, 120-135 parts of styrene and 2.5-3.2 parts of surfactant.
Further, the curing agent is one of curing agents 703, 704 or 781.
Further, the surfactant is polyoxyethylene sorbitan fatty acid ester or sorbitan stearate.
Further, the carbon fibers are polyacrylonitrile-based carbon fibers.
Further, the preparation method of the carbon fiber composite core wire comprises the following steps:
s1: mixing epoxy resin and a curing agent, placing the mixture in a stirrer, stirring the mixture for 5 to 10min at the normal temperature and at the rotating speed of 200-300r/min, then adding phenolic resin, styrene and a surfactant, keeping the rotating speed unchanged, continuing stirring the mixture for 2 to 3min, then adding styrene-butadiene latex, and continuing stirring the mixture for 5 to 8min to obtain a gum dipping solution;
s2: respectively twisting carbon fiber, glass fiber and sisal fiber with S twist of 100 twists/m, then respectively combining 1 fiber, adding Z twist of 100 twists/m, and preparing a composite fiber wire;
s3: and (4) adding the impregnation liquid obtained in the step (S1) into an impregnation tank, placing the composite fiber wire prepared in the step (S2) into a pultrusion machine, starting the pultrusion machine to dip, performing pultrusion, and performing post-curing treatment.
Further, in the step S3, the pultrusion speed is more than or equal to 55 cm/min.
The carbon fiber composite core wire has the excellent performances of high strength, high conductivity, large current-carrying capacity, small linear expansion coefficient, small sag, light weight and the like. The tower type transmission and distribution line is applied to newly-built transmission and distribution lines, the number and the height of towers can be reduced, and the land of a line corridor can be saved to the greatest extent, so that the comprehensive cost of the transmission and distribution lines is reduced, the land resources are saved, and the ecological environment is protected. For the capacity expansion transformation of the existing power transmission line, the traditional common steel-cored aluminum strand can be directly replaced by the carbon fiber composite core wire under the condition of not changing the existing pole tower and power transmission and distribution facilities so as to realize the capacity expansion. The carbon fiber composite core wire can effectively realize the problem of cross-river and cross-sea gorges power transmission, realizes large-span power transmission, and also provides an effective solution for solving the capacity expansion of the power transmission line by improving the advantage of low cost of the existing line, thereby obtaining wide attention of the domestic and foreign power industry.
As composites age under various environmental factors, the life cycle of the durability of carbon fiber composite wires is of additional concern to those skilled in the art. The composite core may be damaged by extrusion and bending in the process of producing and constructing the carbon fiber composite core wire, the composite core may generate surface macroscopic defects, the surface macroscopic defects can reduce the service life of the wire and even cause safety accidents, and the composite core is required to have excellent compression resistance and tensile resistance. For this reason, the applicant has been working on carbon fiber composite core rods for many years. Patent document with publication number CN110517820A discloses a carbon fiber composite core wire core rod for a power transmission line, which belongs to the technical field of power transmission line wires and is made of the following raw materials in parts by weight: 30-40 parts of modified carbon fiber, 12-20 parts of glass fiber, 6-12 parts of polyester fiber, 8-15 parts of silicon nitride, 20-28 parts of polyurethane resin, 210 parts of xylene 205-. The core rod has good mechanical properties, the tensile strength is more than 2663MPa, and the elastic modulus is more than 130 GPa.
The skilled person considers that the light weight and the small sag are inherent properties of the carbon fiber composite core, and compared with the steel-cored aluminum strand, the performance of the carbon fiber composite core wire is excellent, so that the sag performance is rarely continuously researched, and the application of the carbon fiber composite core is limited. Patent document with publication number CN107731351A discloses a carbon fiber composite core conductor wire and a preparation method thereof, relating to the technical field of cable conductor materials. The carbon fiber composite core conductor wire comprises a carbon fiber composite core and a metal conducting layer wrapping the carbon fiber composite core, wherein the carbon fiber composite core is prepared from carbon fibers, glass fibers, polyphenylene sulfide nanofibers, phenolic cyanate resin, methyl tetrahydrophthalic anhydride, an anion promoter, a binder and a solvent. Although these studies can satisfy certain use requirements and improve brittleness, mechanical properties and linear expansion coefficient still need to be improved so as to promote the continuous development of the industry.
The invention has the beneficial effects that:
the invention adopts polyacrylonitrile-based carbon fiber, glass fiber and sisal fiber for blending. The polyacrylonitrile-based carbon fiber has the inherent characteristics of a carbon material, has the flexibility of textile fiber, has very high tensile strength and modulus, and has a series of excellent performances such as high temperature resistance, small linear expansion coefficient, good dimensional stability, electric conduction, chemical corrosion resistance, creep resistance and the like. The glass fiber has good insulativity, strong heat resistance, good corrosion resistance and high mechanical strength, but is brittle and has poor wear resistance. The sisal fiber has tough texture, strong tension, friction resistance and difficult breakage, and the sisal fiber and the glass fiber are blended to overcome the defects of brittle property and poor wear resistance of the glass fiber.
The method comprises the steps of blending carbon fibers, glass fibers and sisal fibers to prepare a composite fiber line, and then performing gum dipping, pultrusion and curing on the composite fiber line; and obtaining the carbon fiber composite core rod. The invention improves the pultrusion speed from the original 30cm/min to more than 55cm/min, the curing degree of the core rod reaches more than 98 percent, and the sag is small. The gum dipping solution is prepared by mixing phenolic resin, epoxy resin, a curing agent, styrene-butadiene latex, styrene and a surfactant. The epoxy resin is used as matrix resin of the composite fiber and is matched with a curing agent, so that the composite fiber has excellent dimensional stability, mechanical property, electrical property and chemical stability. The phenolic resin and the styrene-butadiene latex have synergistic effect with the epoxy resin, so that the adhesiveness of the dipping solution is increased, the mechanical property of the core rod is improved, and the linear expansion coefficient is reduced. The surfactant polyoxyethylene sorbitan fatty acid ester or sorbitan stearate has better emulsibility and dispersibility, and ensures the dispersion stability of the gum dipping solution.
The carbon fiber composite core rod has good comprehensive performance: the surface of the core rod is round, smooth and even, the color is consistent, no defect exists, the tensile strength is 2613MPa-2638MPa, the elastic modulus is 137GPa-145GPa, the core rod is wound on a cylinder body with the diameter of 55D for 1 circle at the winding speed of not more than 3r/min, and the core rod does not crack or break. The surface layer is not cracked and the linear expansion coefficient is 1.57 multiplied by 10 in a torsion 360-degree test-6/℃-1.52×10-6/℃。
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention are clearly and completely described below. It should be apparent that the described embodiments are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.
Example 1
A carbon fiber composite core wire comprises a carbon fiber composite core rod, a glass fiber layer and a soft aluminum molded line layer from inside to outside in sequence; the soft aluminum molded line layer is formed by twisting a plurality of trapezoidal soft aluminum molded lines.
The carbon fiber composite core rod is prepared from the following raw materials in parts by weight: 18 parts of carbon fiber, 3 parts of glass fiber, 5 parts of sisal fiber and 210 parts of gum dipping solution.
The gum dipping solution is prepared from the following raw materials in parts by weight: 8 parts of phenolic resin, 30 parts of epoxy resin, 15 parts of curing agent, 65 parts of styrene-butadiene latex, 120 parts of styrene and 2.5 parts of surfactant.
The curing agent is curing agent 703.
The surfactant is polyoxyethylene sorbitan fatty acid ester.
The carbon fiber is polyacrylonitrile-based carbon fiber.
The preparation method of the carbon fiber composite core wire comprises the following steps:
s1: mixing epoxy resin and a curing agent, placing the mixture in a stirrer, stirring the mixture for 5min at normal temperature at the rotating speed of 300r/min, adding phenolic resin, styrene and a surfactant, keeping the rotating speed unchanged, continuing stirring the mixture for 2min, adding styrene-butadiene latex, and continuing stirring the mixture for 5min to obtain a gum dipping solution;
s2: respectively twisting carbon fiber, glass fiber and sisal fiber with S twist of 100 twists/m, then respectively combining 1 fiber, adding Z twist of 100 twists/m, and preparing a composite fiber wire;
s3: and (4) adding the impregnation liquid obtained in the step (S1) into an impregnation tank, setting the temperature in the impregnation tank to be 20 ℃, placing the composite fiber wire prepared in the step (S2) into a pultrusion machine, starting the pultrusion machine to dip, performing pultrusion, and performing post-curing treatment.
In the step S3, the pultrusion speed is 55 cm/min.
Example 2
A carbon fiber composite core wire comprises a carbon fiber composite core rod, a glass fiber layer and a soft aluminum molded line layer from inside to outside in sequence; the soft aluminum molded line layer is formed by twisting a plurality of trapezoidal soft aluminum molded lines.
The carbon fiber composite core rod is prepared from the following raw materials in parts by weight: 19 parts of carbon fiber, 3.5 parts of glass fiber, 5.5 parts of sisal fiber and 212 parts of gum dipping solution.
The gum dipping solution is prepared from the following raw materials in parts by weight: 9 parts of phenolic resin, 31 parts of epoxy resin, 16 parts of curing agent, 67 parts of styrene-butadiene latex, 123 parts of styrene and 2.6 parts of surfactant.
The curing agent is curing agent 704.
The surfactant is sorbitan stearate.
The carbon fiber is polyacrylonitrile-based carbon fiber.
The preparation method of the carbon fiber composite core wire comprises the following steps:
s1: mixing epoxy resin and a curing agent, placing the mixture in a stirrer, stirring the mixture at normal temperature for 8min at the rotating speed of 250r/min, adding phenolic resin, styrene and a surfactant, keeping the rotating speed unchanged, continuing to stir for 2.5min, adding styrene-butadiene latex, and continuing to stir for 6min to obtain a gum dipping solution;
s2: respectively twisting carbon fiber, glass fiber and sisal fiber with S twist of 100 twists/m, then respectively combining 1 fiber, adding Z twist of 100 twists/m, and preparing a composite fiber wire;
s3: and (4) adding the impregnation liquid obtained in the step (S1) into an impregnation tank, setting the temperature in the impregnation tank to be 25 ℃, placing the composite fiber wire prepared in the step (S2) into a pultrusion machine, starting the pultrusion machine to begin impregnation, performing pultrusion, and performing post-curing treatment.
In the step S3, the pultrusion speed is 56 cm/min.
Example 3
A carbon fiber composite core wire comprises a carbon fiber composite core rod, a glass fiber layer and a soft aluminum molded line layer from inside to outside in sequence; the soft aluminum molded line layer is formed by twisting a plurality of trapezoidal soft aluminum molded lines.
The carbon fiber composite core rod is prepared from the following raw materials in parts by weight: 20 parts of carbon fiber, 4 parts of glass fiber, 6 parts of sisal fiber and 215 parts of gum dipping solution.
The gum dipping solution is prepared from the following raw materials in parts by weight: 10 parts of phenolic resin, 33 parts of epoxy resin, 17 parts of curing agent, 68 parts of styrene-butadiene latex, 125 parts of styrene and 2.7 parts of surfactant.
The curing agent is curing agent 781.
The surfactant is polyoxyethylene sorbitan fatty acid ester.
The carbon fiber is polyacrylonitrile-based carbon fiber.
The preparation method of the carbon fiber composite core wire comprises the following steps:
s1: mixing epoxy resin and a curing agent, placing the mixture in a stirrer, stirring the mixture at normal temperature for 10min at the rotating speed of 200r/min, adding phenolic resin, styrene and a surfactant, keeping the rotating speed unchanged, continuing stirring the mixture for 3min, adding styrene-butadiene latex, and continuing stirring the mixture for 8min to obtain a gum dipping solution;
s2: respectively twisting carbon fiber, glass fiber and sisal fiber with S twist of 100 twists/m, then respectively combining 1 fiber, adding Z twist of 100 twists/m, and preparing a composite fiber wire;
s3: and (4) adding the impregnation liquid obtained in the step (S1) into an impregnation tank, setting the temperature in the impregnation tank to be 30 ℃, placing the composite fiber wire prepared in the step (S2) into a pultrusion machine, starting the pultrusion machine to begin impregnation, performing pultrusion, and performing post-curing treatment.
In the step S3, the pultrusion speed is 58 cm/min.
Example 4
A carbon fiber composite core wire comprises a carbon fiber composite core rod, a glass fiber layer and a soft aluminum molded line layer from inside to outside in sequence; the soft aluminum molded line layer is formed by twisting a plurality of trapezoidal soft aluminum molded lines.
The carbon fiber composite core rod is prepared from the following raw materials in parts by weight: 21 parts of carbon fiber, 4.5 parts of glass fiber, 6.5 parts of sisal fiber and 220 parts of gum dipping solution.
The gum dipping solution is prepared from the following raw materials in parts by weight: 11 parts of phenolic resin, 35 parts of epoxy resin, 17 parts of curing agent, 70 parts of styrene-butadiene latex, 127 parts of styrene and 2.8 parts of surfactant.
The curing agent is curing agent 703.
The surfactant is polyoxyethylene sorbitan fatty acid ester.
The carbon fiber is polyacrylonitrile-based carbon fiber.
The preparation method of the carbon fiber composite core wire comprises the following steps:
s1: mixing epoxy resin and a curing agent, placing the mixture in a stirrer, stirring the mixture at normal temperature for 8min at the rotating speed of 250r/min, adding phenolic resin, styrene and a surfactant, keeping the rotating speed unchanged, continuing to stir for 2.5min, adding styrene-butadiene latex, and continuing to stir for 7min to obtain a gum dipping solution;
s2: respectively twisting carbon fiber, glass fiber and sisal fiber with S twist of 100 twists/m, then respectively combining 1 fiber, adding Z twist of 100 twists/m, and preparing a composite fiber wire;
s3: and (4) adding the impregnation liquid obtained in the step (S1) into an impregnation tank, setting the temperature in the impregnation tank to be 35 ℃, placing the composite fiber wire prepared in the step (S2) into a pultrusion machine, starting the pultrusion machine to dip, performing pultrusion, and performing post-curing treatment.
In the step S3, the pultrusion speed is 59 cm/min.
Example 5
A carbon fiber composite core wire comprises a carbon fiber composite core rod, a glass fiber layer and a soft aluminum molded line layer from inside to outside in sequence; the soft aluminum molded line layer is formed by twisting a plurality of trapezoidal soft aluminum molded lines.
The carbon fiber composite core rod is prepared from the following raw materials in parts by weight: 22 parts of carbon fiber, 4.5 parts of glass fiber, 6.8 parts of sisal fiber and 222 parts of dipping solution.
The gum dipping solution is prepared from the following raw materials in parts by weight: 12 parts of phenolic resin, 36 parts of epoxy resin, 18 parts of curing agent, 72 parts of styrene-butadiene latex, 128 parts of styrene and 2.9 parts of surfactant.
The curing agent is curing agent 704.
The surfactant is polyoxyethylene sorbitan fatty acid ester.
The carbon fiber is polyacrylonitrile-based carbon fiber.
The preparation method of the carbon fiber composite core wire comprises the following steps:
s1: mixing epoxy resin and a curing agent, placing the mixture in a stirrer, stirring the mixture at normal temperature for 10min at the rotating speed of 200r/min, adding phenolic resin, styrene and a surfactant, keeping the rotating speed unchanged, continuing stirring the mixture for 3min, adding styrene-butadiene latex, and continuing stirring the mixture for 8min to obtain a gum dipping solution;
s2: respectively twisting carbon fiber, glass fiber and sisal fiber with S twist of 100 twists/m, then respectively combining 1 fiber, adding Z twist of 100 twists/m, and preparing a composite fiber wire;
s3: and (4) adding the impregnation liquid obtained in the step (S1) into an impregnation tank, setting the temperature in the impregnation tank to be 40 ℃, placing the composite fiber wire prepared in the step (S2) into a pultrusion machine, starting the pultrusion machine to dip, performing pultrusion, and performing post-curing treatment.
In the step S3, the pultrusion speed is 60 cm/min.
Example 6
A carbon fiber composite core wire comprises a carbon fiber composite core rod, a glass fiber layer and a soft aluminum molded line layer from inside to outside in sequence; the soft aluminum molded line layer is formed by twisting a plurality of trapezoidal soft aluminum molded lines.
The carbon fiber composite core rod is prepared from the following raw materials in parts by weight: 123 parts of carbon fiber, 4.8 parts of glass fiber, 7 parts of sisal fiber and 225 parts of gum dipping solution.
The gum dipping solution is prepared from the following raw materials in parts by weight: 13 parts of phenolic resin, 37 parts of epoxy resin, 18 parts of curing agent, 75 parts of styrene-butadiene latex, 130 parts of styrene and 3 parts of surfactant.
The curing agent is curing agent 781.
The surfactant is sorbitan stearate.
The carbon fiber is polyacrylonitrile-based carbon fiber.
The preparation method of the carbon fiber composite core wire is also disclosed in the embodiment 1.
Example 7
A carbon fiber composite core wire comprises a carbon fiber composite core rod, a glass fiber layer and a soft aluminum molded line layer from inside to outside in sequence; the soft aluminum molded line layer is formed by twisting a plurality of trapezoidal soft aluminum molded lines.
The carbon fiber composite core rod is prepared from the following raw materials in parts by weight: 24 parts of carbon fiber, 4.8 parts of glass fiber, 7.5 parts of sisal fiber and 228 parts of gum dipping solution.
The gum dipping solution is prepared from the following raw materials in parts by weight: 14 parts of phenolic resin, 38 parts of epoxy resin, 19 parts of curing agent, 76 parts of styrene-butadiene latex, 133 parts of styrene and 3.1 parts of surfactant.
The curing agent is curing agent 703.
The surfactant is polyoxyethylene sorbitan fatty acid ester.
The carbon fiber is polyacrylonitrile-based carbon fiber.
The preparation method of the carbon fiber composite core wire is the same as that of the embodiment 1.
Example 8
A carbon fiber composite core wire comprises a carbon fiber composite core rod, a glass fiber layer and a soft aluminum molded line layer from inside to outside in sequence; the soft aluminum molded line layer is formed by twisting a plurality of trapezoidal soft aluminum molded lines.
The carbon fiber composite core rod is prepared from the following raw materials in parts by weight: 25 parts of carbon fiber, 5 parts of glass fiber, 8 parts of sisal fiber and 230 parts of gum dipping solution.
The gum dipping solution is prepared from the following raw materials in parts by weight: 15 parts of phenolic resin, 40 parts of epoxy resin, 20 parts of curing agent, 78 parts of styrene-butadiene latex, 135 parts of styrene and 3.2 parts of surfactant.
The curing agent is curing agent 781.
The surfactant is polyoxyethylene sorbitan fatty acid ester.
The carbon fiber is polyacrylonitrile-based carbon fiber.
The preparation method of the carbon fiber composite core wire is the same as that of the embodiment 1.
In examples 1 to 8, the carbon fiber composite core wire was prepared by the same method as the composite fiber wire in the processes of dipping, pultrusion, and curing of the glass fiber. In addition, before gum dipping, the glass fiber and the composite fiber wire are preheated, so that the drying of the carbon fiber yarn and the glass fiber yarn is ensured, and the strength performance and the insulation performance are improved.
The outer layer of glass fibers and the inner layer of composite fiber strands were separately infiltrated in two different areas for purity and insulation properties of the glass fibers.
And controlling the incoming wire coating of the glass fiber, wherein in order to ensure that the glass fiber can be uniformly coated on the surface of the carbon fiber composite core rod, two groups of semi-ring guide wheels are adopted to uniformly guide each infiltrated glass fiber to the carbon fiber composite core rod, and each infiltrated glass fiber is annularly coated on the surface of the carbon fiber composite core rod to perform a thermosetting reaction.
Stranding of the carbon fiber composite core wire is carried out on an 630/6+12+18 cradle type stranding machine. Before stranding, a stranding worker carefully checks the appearance quality of each single wire, a special doubling die is matched, the wires are wound according to the requirements specified by the process, the rotating speed of a stranding cage and the traction linear speed are adjusted, and the pre-twisting angle and the tension are adjusted, so that each single wire is uniformly and uniformly tensioned. The twisted conductor has close and compact contact, smooth, compact and uniform surface, no phenomena of strand loosening or surface damage and the like, and the pitch-diameter ratio of each layer of the twisted wire meets the requirements specified by the process and technical standards.
The outer soft aluminum molded line of the carbon fiber composite core lead is formed by extruding and forming an aluminum rod and then twisting the aluminum rod through a twisting process. The trapezoidal aluminum type wire conductors on the inner layer and the outer layer of the composite core wire are easy to turn over on a traditional twisting and untwisting device, in order to solve the problem, a pretwisting device is added for each section of twisting cage of a frame type wire twisting machine, namely, each single wire is pretwisted for about 360 degrees before twisting so as to ensure the positioning and shaping of the molded wire; in order to ensure that each single wire is subjected to uniform tension when twisted, the twisted wires are attached, compact and uniform, and a tension control system of each disc is debugged; in order to ensure the surface quality of the aluminum type single line in the stranding process, the threading nozzle of the frame stranding machine adopts alumina corundum pottery material, and the traction wheel of the frame stranding machine is polished.
Comparative example 1
The present comparative example provides a carbon fiber composite core wire and a method for manufacturing the same, and is different from example 1 in that the pultrusion speed is 30cm/min in step S3 of the present comparative example.
Comparative example 2
The comparative example provides a carbon fiber composite core wire and a preparation method thereof, and is different from the example 1 in that sisal fibers are absent in the impregnation solution of the comparative example, which is the same as the example 1.
Comparative example 3
The comparative example provides a carbon fiber composite core wire and a preparation method thereof, and is different from the example 1 in that phenolic resin is absent in a dipping solution of the comparative example, which is the same as the example 1.
Comparative example 4
The comparative example provides a carbon fiber composite core wire and a preparation method thereof, and is different from the example 1 in that the dipping solution of the comparative example lacks styrene-butadiene latex.
Test method
The carbon fiber composite core rods of examples 1 to 8 and comparative examples 1 to 4 were subjected to performance tests, and were performed according to the GB/T29324-2012 standard.
TABLE 1 test results of carbon fiber composite core rods of examples 1-8 and comparative examples 1-4
With reference to table 1, the performance of the carbon fiber composite core rods of examples 1 to 8 and comparative examples 1 to 4 of the present invention was tested, and the carbon fiber composite core rods of examples 1 to 8 all showed good comprehensive performance: the surface of the core rod is round, smooth and even, the color is consistent, no defect exists, the tensile strength is 2613MPa-2638MPa, the elastic modulus is 137GPa-145GPa, the core rod is wound on a cylinder body with the diameter of 55D for 1 circle at the winding speed of not more than 3r/min, and the core rod does not crack or break. The surface layer is not cracked and the linear expansion coefficient is 1.57 multiplied by 10 in a torsion 360-degree test-6/℃-1.52×10-6V. C. The pultrusion speed of the core rod is 30cm/min in the comparative example 1, sisal fibers are absent in the comparative example 2, phenolic resin is absent in the comparative example 3, styrene-butadiene latex is absent in the comparative example 4, and the performance of the core rod is reduced.
Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and other modifications or equivalent substitutions made by the technical solutions of the present invention by those of ordinary skill in the art should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.
Claims (2)
1. The utility model provides a carbon fiber composite core wire which characterized in that: the carbon fiber composite core rod, the glass fiber layer and the soft aluminum molded line layer are sequentially arranged from inside to outside; the soft aluminum profile layer is formed by twisting a plurality of trapezoidal soft aluminum profiles;
the carbon fiber composite core rod is prepared from the following raw materials in parts by weight: 18-25 parts of carbon fiber, 3-5 parts of glass fiber, 5-8 parts of sisal fiber and 230 parts of dipping solution;
the gum dipping solution is prepared from the following raw materials in parts by weight: 8-15 parts of phenolic resin, 30-40 parts of epoxy resin, 15-20 parts of curing agent, 65-78 parts of styrene-butadiene latex, 120-135 parts of styrene and 2.5-3.2 parts of surfactant; the curing agent is one of curing agents 703, 704 or 781; the surfactant is polyoxyethylene sorbitan fatty acid ester or sorbitan stearate;
the tensile strength of the carbon fiber composite core rod is 2613MPa-2638MPa, the elastic modulus is 137GPa-145GPa, the core rod is wound on a cylinder body with the diameter of 55D for 1 circle at the winding speed of not more than 3r/min, and the core rod does not crack or break; the surface layer is not cracked and the linear expansion coefficient is 1.57 multiplied by 10 in a torsion 360-degree test-6/℃-1.52×10-6/℃；
The preparation method of the carbon fiber composite core wire comprises the following steps:
s1: mixing epoxy resin and a curing agent, placing the mixture in a stirrer, stirring the mixture for 5 to 10min at normal temperature at the rotation speed of 200-300r/min, then adding phenolic resin, styrene and a surfactant, keeping the rotation speed unchanged, continuing stirring the mixture for 2 to 3min, then adding styrene-butadiene latex, and continuing stirring the mixture for 5 to 8min to obtain a gum dipping solution;
s2: respectively twisting carbon fiber, glass fiber and sisal fiber with S twist of 100 twists/m, then respectively combining 1 fiber, adding Z twist of 100 twists/m, and preparing a composite fiber wire;
s3: adding the impregnation solution obtained in the step S1 into an impregnation tank, placing the composite fiber wire prepared in the step S2 into a pultrusion machine, starting the pultrusion machine to dip, performing pultrusion, and performing post-curing treatment; the pultrusion speed is more than or equal to 55 cm/min;
the glass fiber is dipped, pultruded and cured by the same method as the composite fiber wire; preheating the glass fiber and the composite fiber wire before gum dipping to ensure the drying of the carbon fiber wire and the glass fiber wire;
respectively infiltrating the glass fiber of the outer layer and the composite fiber wire of the inner layer in two different areas;
controlling the incoming wire coating of the glass fiber, wherein in order to ensure that the glass fiber can be uniformly coated on the surface of the carbon fiber composite core rod, two groups of semi-ring guide wheels are adopted to uniformly guide each infiltrated glass fiber to the carbon fiber composite core rod, and the glass fiber is annularly coated on the surface of the carbon fiber composite core rod to perform a thermosetting reaction;
stranding the carbon fiber composite core wire is carried out on an 630/6+12+18 cradle type stranding machine; before stranding, carefully checking the appearance quality of each single wire coil by a stranding worker, matching with a special doubling die, coiling the single wires according to the process specified requirements, adjusting the rotating speed and the traction linear speed of a stranding cage, and adjusting the pre-twisting angle and the tension to enable each single wire to be subjected to uniform tension;
the outer soft aluminum molded line of the carbon fiber composite core lead is formed by extruding and molding an aluminum rod and then twisting the aluminum rod through a twisting process; a frame-type stranding machine is adopted, a pre-twisting device is added to each section of stranding cage, namely, before stranding, each single wire is pre-twisted for about 360 degrees to ensure the positioning and shaping of the molded line; in order to ensure that each single wire is uniformly and uniformly tensioned when twisted, the twisted wires are close, tight and uniform, and a tension control system of each disc is debugged; in order to ensure the surface quality of the aluminum type single wire in the stranding process, the threading nozzle of the frame-type stranding machine is made of alumina corundum ceramic, and the traction wheel of the frame stranding machine is polished.
2. The carbon fiber composite core wire according to claim 1, wherein: the carbon fiber is polyacrylonitrile-based carbon fiber.
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