CN115304921A - High-temperature-resistant cable protective sleeve, preparation method thereof and aerial cable - Google Patents
High-temperature-resistant cable protective sleeve, preparation method thereof and aerial cable Download PDFInfo
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- CN115304921A CN115304921A CN202211099475.1A CN202211099475A CN115304921A CN 115304921 A CN115304921 A CN 115304921A CN 202211099475 A CN202211099475 A CN 202211099475A CN 115304921 A CN115304921 A CN 115304921A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
- C08L83/04—Polysiloxanes
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- 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
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08L2203/00—Applications
- C08L2203/20—Applications use in electrical or conductive gadgets
- C08L2203/202—Applications use in electrical or conductive gadgets use in electrical wires or wirecoating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables
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Abstract
The application relates to the technical field of cable materials, and particularly discloses a high-temperature-resistant cable protective sleeve, a preparation method thereof and an overhead cable. A high-temperature-resistant cable protective sleeve comprises the following raw materials in parts by weight: 40-50 parts of silicon rubber, 5-10 parts of ethylene propylene diene monomer, 20-30 parts of epoxy resin, 20-30 parts of polyether ether ketone, 10-15 parts of white carbon black, 2-5 parts of tetramethylcyclotetrasiloxane, 5-10 parts of zinc silicate, 10-20 parts of carbon fiber, 3-5 parts of dispersing agent, 0.5-1 part of hexadecyl trimethyl ammonium bromide and 2-4 parts of vulcanizing agent. The heat-resistant temperature of the overhead cable protective sleeve can reach 332.5-346.0 ℃, after the overhead cable protective sleeve is placed in an environment with the temperature of 300 ℃ and the pressure of 0.5MPa for 30min, the elongation is as low as 28-38%, the permanent deformation rate after cooling is as low as 2-5%, the cable protective sleeve has excellent high-temperature resistance and good durability at high temperature.
Description
Technical Field
The application relates to the technical field of cable materials, in particular to a high-temperature-resistant cable protective sleeve, a preparation method thereof and an overhead cable.
Background
The overhead cable (full-name overhead insulated cable) is an overhead conductor with insulating layer and protective sheath, and is a special cable made up by using the production process similar to crosslinked cable, and is a new power transmission mode between overhead conductor and underground cable.
The protective sheath of aerial cable generally adopts the silica gel layer, for example vinyl silicone rubber, and this kind of silica gel can normally work at certain temperature range, but when the temperature continued to rise, silica gel will be ageing fast, seriously influences aerial cable's normal use. Therefore, for an application environment requiring higher temperature, the current overhead cable is not suitable, and there is a need to research an overhead cable having excellent aging resistance performance also at high temperature.
Disclosure of Invention
In order to improve the high temperature resistance of the overhead cable and improve the durability of the overhead cable in a high-temperature environment, the application provides a high-temperature-resistant cable protective sleeve, a preparation method of the high-temperature-resistant cable protective sleeve and a cable.
First aspect, the application provides a high temperature resistant cable protective sheath, adopts following technical scheme:
a high-temperature-resistant cable protective sleeve comprises the following raw materials in parts by weight: 40-50 parts of silicon rubber, 5-10 parts of ethylene propylene diene monomer, 20-30 parts of epoxy resin, 20-30 parts of polyether ether ketone, 10-15 parts of white carbon black, 2-5 parts of tetramethylcyclotetrasiloxane, 5-10 parts of zinc silicate, 10-20 parts of carbon fiber, 3-5 parts of dispersing agent, 0.5-1 part of hexadecyl trimethyl ammonium bromide and 2-4 parts of vulcanizing agent.
By adopting the technical scheme, the silicone rubber, the ethylene propylene diene monomer, the epoxy resin and the polyether-ether-ketone are used as base materials, the epoxy resin is used for modifying the ethylene propylene diene monomer under the high-temperature condition, and then the modified ethylene propylene diene monomer is mixed with the silicone rubber and the polyether-ether-ketone, so that the high-temperature resistance of the sheath material can be effectively improved; white carbon black, zinc silicate and carbon fiber are compounded to be used as filler, the white carbon black is an important reinforcing filler in a reinforcing filling system, the physical and mechanical properties and the processing technology of rubber are greatly influenced, and the durability of the cable protective sleeve is favorably improved; the zinc silicate is a colorless trigonal crystal, has the specific gravity of 4.103 and the melting point of 1512 ℃, has excellent high temperature resistance, can absorb heat acting on the cable protective sleeve by dispersing the zinc silicate in a base material system, reduces the destructive effect of high temperature on the base material, and improves the durability of the cable protective sleeve in a high-temperature environment; the carbon fiber also has excellent high temperature resistance, and can absorb heat acting on the cable protection sleeve by dispersing the carbon fiber in a base material system, the carbon fiber is formed by matching with zinc silicate, and the dotted line combined heat absorption and dispersion network can absorb and disperse the heat acting on the cable protection sleeve to a greater extent, so that the damage effect of high temperature on the base material is reduced, and the durability of the cable protection sleeve in a high-temperature environment is improved.
Preferably, the carbon fiber is a modified carbon fiber subjected to sizing treatment.
By adopting the technical scheme, the sizing treatment can improve the dispersibility of the carbon fibers and the dispersion effect of the carbon fibers in the base material, the heat absorption and dispersion network formed by the carbon fibers and the zinc silicate fully acts in the base material, the absorption and dispersion effects of the cable protective sleeve on heat are further improved, the destructive effect of high temperature on the base material is reduced, and the durability of the cable protective sleeve in a high-temperature environment is improved.
Preferably, the preparation method of the modified carbon fiber comprises the following steps:
1) Preparation of sizing agent
Dissolving a phenolphthalein type polyaryletherketone polymer and hexadecyl trimethyl ammonium bromide in water according to a weight ratio of 1; ultrasonically shearing the mixed solution, and evaporating trichloromethane to obtain a sizing agent;
2) Sizing treatment
Soaking the carbon fibers in the sizing agent obtained in the step 1) for 5-10min; and extruding out the redundant sizing agent and drying to obtain the modified carbon fiber.
By adopting the technical scheme, the phenolphthalein type polyaryletherketone polymer is used as the main raw material of the sizing agent, and the chemical structure of the prepared sizing agent is similar to that of a polyether-ether-ketone resin matrix, so that good interface compatibility is provided between carbon fibers and the polyether-ether-ketone matrix; the sizing agent can be firmly adhered to the surface of the carbon fiber through pi-pi interaction and van der waals force, and the interfacial adhesion of the composite material can be enhanced by physical entanglement and diffusion between the molecular chain of the sizing agent and the molecular chain of the polyether-ether-ketone resin matrix; the ketone group in the polyether-ether-ketone resin matrix can generate a hydrogen bond with the carboxyl group in the sizing agent, and the interface combination of the carbon fiber and the base material matrix is further promoted. The integral strength of the cable protection material is improved, and the durability of the cable protection sleeve is improved.
Preferably, the preparation method of the phenolphthalein type polyaryletherketone polymer comprises the following steps:
under the atmosphere of nitrogen, uniformly mixing 2-4 parts of 4,4' -difluorobenzophenone, 0-0.3 part of phenolphthalein, 2-5 parts of phenolphthalein, 1-2 parts of potassium carbonate, 3-5 parts of dimethyl sulfoxide and 6-8 parts of toluene in parts by weight, heating to 120-130 ℃, and then carrying out reflux reaction for 3 hours at the temperature; and then heating to 165-175 ℃ for reaction for 5 hours to obtain a reaction product, adding the reaction product into a hydrochloric acid solution for discharging, and then filtering, washing and drying to obtain the phenolphthalein type polyaryletherketone polymer.
By adopting the technical scheme, the synthesized polymer contains a large number of aromatic elements with rigid framework structures, and the interaction between strong polar carboxyl groups in the side chains is also beneficial to improving the glass transition temperature of the polymer, the glass transition temperature of the polymer is higher than that of polyether-ether-ketone, and the thermal property of the phenolphthalein type polyaryletherketone polymer is improved, so that the thermal property of the cable protective sleeve is ensured.
Preferably, the weight ratio of the phenolphthalein to the phenolphthalein is (5-7): 100.
by adopting the technical scheme, the ratio of phenolphthalein to phenolphthalein can change the number of carboxyl groups on the phenolphthalein type polyaryletherketone polymer and the molecular weight of the phenolphthalein type polyaryletherketone polymer; the introduction of carboxyl is beneficial to improving the hydrophilicity of the carbon fiber and improving the bonding strength of the carbon fiber and the base material matrix, but the introduction of too much carboxyl can cause poor thermal stability of the polymer, so that the heat resistance of the polymer is reduced; in addition, the molecular weight of the polymer is increased due to excessive introduction of carboxyl, and the excessive molecular weight is not beneficial to improving the interface combination of the carbon fiber and the base material matrix; within the scope defined by the present application, the thermal stability of the polymer and the effect of improving the interfacial bonding of the carbon fibers to the matrix of the matrix are both achieved to a relatively superior level.
Preferably, the dispersant comprises 1: (4-5): (2-3) epoxidized soybean oil, anionic polyacrylamide and polyoxyethylene.
By adopting the technical scheme, the epoxidized soybean oil can be grafted on the surface of the white carbon black, so that the polarity of the white carbon black is reduced, and the compatibility of the white carbon black and a base material matrix is improved; the surface groups and the surface of the carbon fibers have a certain amount of negative charges, and the anionic polyacrylamide can increase the negative charge of the surface of the carbon fibers, so that the repulsion among the carbon fibers is increased, and the dispersion condition of the carbon fibers is improved; the polyoxyethylene has certain adhesiveness, can be adsorbed on the surface of the zinc silicate to form a smooth and non-adhesive hydrated mold, and organizes the zinc silicate particles to be agglomerated. The epoxidized soybean oil, the anionic polyacrylamide and the polyoxyethylene are matched to ensure that the inorganic filler is uniformly dispersed in a base material system, thereby being beneficial to improving the heat resistance of the material.
Preferably, the zinc silicate is surface-modified by a coupling agent.
By adopting the technical scheme, the surface treatment of the silane coupling agent can improve the wettability of the surface of the zinc silicate, improve the binding capacity between the zinc silicate and an organic matter and be beneficial to improving the strength of the material.
In a second aspect, the present application provides a method for preparing a high temperature resistant cable protection sleeve, which adopts the following technical scheme: a preparation method of a high-temperature-resistant cable protective sleeve comprises the following steps:
s1, mixing ethylene propylene diene monomer and epoxy resin, heating to 200-220 ℃, preserving heat for 30-40min, adding cetyl trimethyl ammonium bromide, and preserving heat for 20-30min to obtain a first product;
s2, mixing and heating silicon rubber, polyether-ether-ketone and the first product obtained in the step S1 to 220-240 ℃, and preserving heat for 2-3 hours to obtain a second product;
s3, mixing and grinding the white carbon black and the zinc silicate, heating to 350-400 ℃, adding the tetramethylcyclotetrasiloxane, and dispersing to obtain auxiliary materials;
s4, dispersing the carbon fibers, uniformly mixing the dispersed carbon fibers with the auxiliary materials and the dispersing agent obtained in the step S3, then mixing the mixture with a vulcanizing agent and a second product, mixing for 2-3 hours at 220-240 ℃, and then extruding and plasticizing to obtain the high-temperature-resistant cable protective sleeve.
By adopting the technical scheme, the preparation method is simple and easy to operate, has no special requirements on equipment, and is suitable for industrial production.
In a third aspect, the present application provides an aerial cable prepared using any of the above-described high temperature resistant cable protective sleeves.
In summary, the present application has the following beneficial effects:
1. according to the cable protective sleeve, silicon rubber, ethylene propylene diene monomer, epoxy resin and polyether ether ketone are used as base materials, white carbon black, zinc silicate and carbon fiber are used as fillers, the heat-resistant temperature of the prepared cable protective sleeve can reach 332.5-346.0 ℃, after the cable protective sleeve is placed at 300 ℃ and 0.5MPa for 30min, the elongation is as low as 28-38%, the permanent deformation rate after cooling is as low as 2-5%, the cable protective sleeve has excellent high-temperature resistance and good durability at high temperature.
2. The sizing agent is preferably adopted to carry out sizing treatment on the carbon fibers, so that the bonding strength of the carbon fibers and the base material is improved, and the durability of the cable protective sleeve at high temperature is favorably improved.
Detailed Description
The present application will be described in further detail with reference to examples.
Examples of preparation of raw materials and/or intermediates
Starting materials
The raw materials of the embodiments of the present application can be obtained by commercially available:
the epoxy resin is E50 epoxy resin;
the molecular weight of the polyether-ether-ketone is 328.31;
the vulcanizing agent is dicumyl peroxide.
Preparation example
Preparation examples I-1 to I-5
A phenolphthalein type polyaryletherketone polymer is prepared by the following steps:
according to the proportion in the table 1, 4' -difluorobenzophenone, phenolphthalein, potassium carbonate, dimethyl sulfoxide and toluene are uniformly mixed in a nitrogen atmosphere, heated to 125 ℃, and then subjected to reflux reaction for 3 hours at the temperature; and then heating to 170 ℃ for reaction for 5h, recycling toluene in the process to obtain a reaction product, slowly pouring the reaction product into a hydrochloric acid solution with the mass percentage concentration of 10% for discharging, then filtering, washing with water, and drying in vacuum at 120 ℃ for 6h to obtain the phenolphthalein type polyaryletherketone polymer.
TABLE 1 preparation examples I-1 to I-5 raw material proportioning Table (kg)
| Preparation example I-1 | Preparation example I-2 | Preparation example I-3 | Preparation example I-4 | Preparation example I-5 | |
| 4,4' -Difluorobenzophenone | 2 | 3 | 4 | 3 | 3 |
| Phenolphthalein derivatives | 0.30 | 0.10 | 0.00 | 0.28 | 0.20 |
| Phenolphthalein | 2 | 4 | 5 | 4 | 4 |
| Potassium carbonate | 1.0 | 1.5 | 2.0 | 1.5 | 1.5 |
| Dimethyl sulfoxide | 5 | 4 | 3 | 4 | 4 |
| Toluene | 6 | 7 | 8 | 7 | 7 |
Preparation example II-1
A modified carbon fiber is prepared by the following steps:
1) Preparation of sizing agent
Dissolving 1kg of phenolphthalein type polyaryletherketone polymer obtained in preparation example I-1 and 1kg of cetyltrimethylammonium bromide in 200L of water, and then adding 0.1kg of chloroform to form a mixed solution; ultrasonically shearing the mixed solution for 10min, and evaporating trichloromethane in the mixed solution through a rotary evaporator to obtain a sizing agent;
2) Sizing treatment
Soaking the carbon fibers in acetone for 48 hours, taking out, alternately cleaning the carbon fibers by using deionized water and ethanol, drying the carbon fibers at 120 ℃ for 3 hours, and soaking the carbon fibers in the sizing agent obtained in the step 1) for 10 minutes; and extruding out the redundant sizing agent, and drying at 120 ℃ for 3 hours to obtain the modified carbon fiber.
Preparation examples II-2 to II-5
In contrast to preparation example II-1, the phenolphthalein type polyaryletherketone polymers in step 1) of preparation examples II-2 to II-5 were obtained from preparation examples I-2 to I-5, respectively.
Preparation example III-1
A modified zinc silicate is prepared by the following steps:
soaking the zinc silicate particles in a silane coupling agent KH-570, taking out after 20min, and drying at 80 ℃ for 1h to obtain the modified zinc silicate.
Examples
Examples 1 to 3
A high-temperature-resistant cable protective sleeve is prepared by the following steps:
s1, mixing and heating ethylene propylene diene monomer and epoxy resin to 200 ℃ according to the raw material ratio shown in Table 2, preserving heat for 40min, adding cetyl trimethyl ammonium bromide, and preserving heat for 20min to obtain a first product;
s2, mixing and heating silicon rubber, polyether-ether-ketone and the first product obtained in the step S1 to 220 ℃ according to the raw material ratio shown in the table 2, and preserving heat for 3 hours to obtain a second product;
s3, according to the raw material proportion of Table 2, mixing and grinding the white carbon black and the zinc silicate, heating to 350 ℃, then adding the tetramethylcyclotetrasiloxane, and dispersing to obtain auxiliary materials;
s4, according to the raw material proportion of the table 2, ultrasonically dispersing carbon fibers, uniformly mixing the carbon fibers with the auxiliary materials and the dispersing agent obtained in the step S3, then mixing the mixture with a vulcanizing agent and a second product, mixing for 3 hours at 220 ℃, and then extruding and plasticizing to obtain a high-temperature-resistant cable protective sleeve;
wherein the dispersant is polyoxyethylene.
TABLE 2 EXAMPLES 1-3 raw materials proportioning Table (kg)
| Example 1 | Example 2 | Example 3 | |
| Silicone rubber | 40 | 45 | 50 |
| Ethylene propylene diene monomer | 10 | 8 | 5 |
| Epoxy resin | 20 | 25 | 30 |
| Polyether ether ketone | 30 | 25 | 20 |
| White carbon black | 10 | 12 | 15 |
| Tetramethylcyclotetrasiloxane | 5 | 3 | 2 |
| Zinc silicate | 5 | 8 | 10 |
| Carbon fiber | 20 | 15 | 10 |
| Dispersing agent | 3 | 4 | 5 |
| Hexadecyl trimethyl ammonium bromide | 1.0 | 0.7 | 0.5 |
| Vulcanizing agent | 2 | 3 | 4 |
Examples 4 to 8
In contrast to example 2, examples 4 to 8 each replaced the same amount of the modified carbon fibers from preparation examples II-1 to II-5.
Example 9
In contrast to example 8, example 9 replaces the zinc silicate with an equivalent amount of the modified zinc silicate from preparation III-1.
Examples 10 to 13
In contrast to example 9, the dispersants of examples 10 to 13 are as specified in Table 3.
TABLE 3 dispersant proportioning Table (kg) in examples 9-13
| Example 9 | Example 10 | Example 11 | Example 12 | Example 13 | |
| Epoxidized soybean oil | 0.0 | 0.0 | 0.5 | 0.5 | 0.5 |
| Anionic polyacrylamide | 0.0 | 2.0 | 2.0 | 2.3 | 2.5 |
| Polyethylene oxide | 4.0 | 2.0 | 1.5 | 1.2 | 1.0 |
Comparative example
Comparative example 1
Different from the example 1, the raw material ratio is different, and the details are shown in the table 4.
TABLE 4 COMPARATIVE EXAMPLE 1 raw materials proportioning Table (kg)
Performance test
Detection method/test method
The cable protective sleeves of examples 1 to 13 and comparative examples 1 to 5 were subjected to performance tests, and the test results are shown in table 5:
the jacket materials of examples 1 to 13 and comparative examples 1 to 5 were tabletted using an MZ-4102 tablet press, and the heat resistance temperature of each set of samples was measured using a thermogravimetric analyzer TGA tester in accordance with the GB/T528-82 standard.
The sheath materials of examples 1 to 13 and comparative examples 1 to 5 were left at 300 ℃ under 0.5MPa for 30 minutes, and then elongation and permanent set after cooling were measured with reference to GB/T2951.21 to 2008.
TABLE 5 Performance test results
Combining examples 1-13 with comparative examples 1-5, and combining table 5, it can be seen that the heat-resistant temperature of the cable protective sleeve material in examples 1-13 is higher than that in comparative examples 1-5, and the elongation and deformation are lower than that in comparative examples 1-5, which indicates that the cable protective sleeve prepared by the present application has high heat-resistant temperature, and has small deformation in a high temperature environment of 300 ℃, and strong durability in a high temperature environment.
Combining example 1 with comparative examples 1-3, and combining table 5, it can be seen that the base material in comparative example 1 does not contain epdm, the base material in comparative example 2 does not contain epoxy resin, and the base material in comparative example 3 does not contain peek, the heat resistance temperature in comparative examples 1-3 is reduced and the elongation and deformation are increased compared to example 1, which may be because the epdm is modified by the epoxy resin under high temperature conditions, and then mixed with the silicone rubber and peek, which can effectively improve the high temperature resistance of the sheath material.
By combining example 1 with comparative example 4 and table 5, it can be seen that if the comparative example 1 does not contain tetramethylcyclotetrasiloxane, the heat-resistant temperature is reduced and the elongation and deformation are increased in the comparative example 4 compared with example 1, which is probably because tetramethylcyclotetrasiloxane and white carbon black can be compounded to form a reinforcing agent, thereby effectively improving the high-temperature resistance of the cable sheath material.
Combining example 1 with comparative example 5, and table 5, it can be seen that, if no carbon fiber is contained in comparative example 5, the heat resistance temperature is reduced and the elongation and deformation rate are increased in comparative example 5 compared to example 1, which may be because the carbon fiber and zinc silicate cooperate to form a dotted-line combined heat absorption and dispersion network, so as to absorb and disperse heat acting on the cable protective jacket to a greater extent, reduce the damage of high temperature to the base material, and improve the durability of the cable protective jacket in a high temperature environment.
It can be seen from the combination of example 2 and examples 4-8, and table 5 that the heat resistant temperature of the cable sheath material in examples 4-8 is higher than that in example 2, and the elongation and deformation are lower than those in example 2, probably because the sizing agent prepared by the present application has excellent high temperature resistance, and the treatment of the carbon fiber with the sizing agent can improve the bonding strength of the carbon fiber to the matrix, and thus the durability.
By combining example 9 with examples 10-13 and table 5, it can be seen that the heat-resistant temperature of the cable sheath material in examples 10-13 is higher than that of example 9, and the elongation and deformation are lower than those of example 9, which is probably because the epoxy soybean oil, the anionic polyacrylamide and the polyoxyethylene are compounded as the dispersant, so that the dispersion effect of the white carbon black, the zinc silicate and the carbon fiber in the base material is improved, the heat absorption and dispersion network combined by the dotted line is more uniform, and the high-temperature resistance of the cable sheath material is improved.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (9)
1. The high-temperature-resistant cable protective sleeve is characterized by comprising the following raw materials in parts by weight: 40-50 parts of silicon rubber, 5-10 parts of ethylene propylene diene monomer, 20-30 parts of epoxy resin, 20-30 parts of polyether ether ketone, 10-15 parts of white carbon black, 2-5 parts of tetramethylcyclotetrasiloxane, 5-10 parts of zinc silicate, 10-20 parts of carbon fiber, 3-5 parts of dispersing agent, 0.5-1 part of hexadecyl trimethyl ammonium bromide and 2-4 parts of vulcanizing agent.
2. A high temperature resistant cable sheath according to claim 1, wherein: the carbon fiber is modified carbon fiber subjected to sizing treatment.
3. A high temperature resistant cable sheath according to claim 2, wherein: the preparation method of the modified carbon fiber comprises the following steps:
1) Preparation of sizing agent
Dissolving a phenolphthalein type polyaryletherketone polymer and hexadecyl trimethyl ammonium bromide in water according to a weight ratio of 1; ultrasonically shearing the mixed solution, and evaporating trichloromethane to obtain a sizing agent;
2) Sizing treatment
Soaking the carbon fibers in the sizing agent obtained in the step 1) for 5-10min; and extruding out the redundant sizing agent and drying to obtain the modified carbon fiber.
4. A high temperature resistant cable sheath according to claim 3, wherein: the preparation method of the phenolphthalein type polyaryletherketone polymer comprises the following steps:
under the atmosphere of nitrogen, uniformly mixing 2-4 parts of 4,4' -difluorobenzophenone, 0-0.3 part of phenolphthalein, 2-5 parts of phenolphthalein, 1-2 parts of potassium carbonate, 3-5 parts of dimethyl sulfoxide and 6-8 parts of toluene in parts by weight, heating to 120-130 ℃, and then carrying out reflux reaction for 3 hours at the temperature; and then heating to 165-175 ℃ for reaction for 5 hours to obtain a reaction product, adding the reaction product into a hydrochloric acid solution for discharging, and then filtering, washing and drying to obtain the phenolphthalein type polyaryletherketone polymer.
5. A high temperature resistant cable sheath according to claim 4, wherein: the weight ratio of the phenolphthalein to the phenolphthalein is (5-7): 100.
6. a high temperature resistant cable sheath according to claim 1, wherein: the dispersant comprises the following components in percentage by weight of 1: (4-5): (2-3) epoxidized soybean oil, anionic polyacrylamide and polyoxyethylene.
7. A high temperature resistant cable sheath according to claim 1, wherein: the zinc silicate is surface-modified by a coupling agent.
8. A method for preparing a high temperature resistant cable sheath according to any one of claims 1 to 7, comprising the steps of:
s1, mixing ethylene propylene diene monomer and epoxy resin, heating to 200-220 ℃, preserving heat for 30-40min, adding cetyl trimethyl ammonium bromide, and preserving heat for 20-30min to obtain a first product;
s2, mixing and heating silicon rubber, polyether-ether-ketone and the first product obtained in the S1 to 220-240 ℃, and preserving heat for 2-3h to obtain a second product;
s3, mixing and grinding the white carbon black and the zinc silicate, heating to 350-400 ℃, adding tetramethylcyclotetrasiloxane, and dispersing to obtain auxiliary materials;
and S4, dispersing the carbon fibers, uniformly mixing the dispersed carbon fibers with the auxiliary materials and the dispersing agent obtained in the step S3, mixing the mixture with a vulcanizing agent and a second product, mixing for 2-3 hours at 220-240 ℃, and extruding and plasticizing to obtain the high-temperature-resistant cable protective sleeve.
9. An overhead cable prepared using the high temperature resistant cable jacket of any one of claims 1-7.
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| CN115304921B (en) | 2023-05-26 |
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