CN111499931A - High-strength heat-resistant cable and preparation method thereof - Google Patents
High-strength heat-resistant cable and preparation method thereof Download PDFInfo
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- CN111499931A CN111499931A CN202010221555.4A CN202010221555A CN111499931A CN 111499931 A CN111499931 A CN 111499931A CN 202010221555 A CN202010221555 A CN 202010221555A CN 111499931 A CN111499931 A CN 111499931A
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- C08L7/00—Compositions of natural rubber
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
- B29B7/22—Component parts, details or accessories; Auxiliary operations
- B29B7/28—Component parts, details or accessories; Auxiliary operations for measuring, controlling or regulating, e.g. viscosity control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29B7/00—Mixing; Kneading
- B29B7/80—Component parts, details or accessories; Auxiliary operations
- B29B7/82—Heating or cooling
- B29B7/823—Temperature control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
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- 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
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
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- 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
- H01B13/06—Insulating conductors or cables
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- 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
- H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
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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
- H01B7/02—Disposition of insulation
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- 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
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- 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
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- 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
- H01B7/292—Protection against damage caused by extremes of temperature or by flame using material resistant to heat
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- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
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Abstract
The invention discloses a high-strength heat-resistant cable and a preparation method thereof, wherein the cable comprises a cable core, an insulating sleeve and a protective sleeve, the insulating sleeve is coated on the outer surface of the cable core, and the protective sleeve is coated on the outer surface of the insulating sleeve to form a cable, wherein the cable core is prepared by a conventional processing technology; for the insulating layer and the protective sleeve, the component proportion and the processing technology of the insulating layer and the protective sleeve are optimized in the scheme, when the protective sleeve is actually prepared, the protective sleeve comprises components such as natural rubber, thermoplastic polyurethane, a silane coupling agent, white carbon black and the like, a blending system is established through the natural rubber and the thermoplastic polyurethane, the white carbon black, glass fiber and mica powder are used as reinforcing materials, and the prepared protective sleeve has excellent mechanical properties; the preparation method is reasonable in process design and simple to operate, and the prepared cable has excellent mechanical property, high strength and excellent heat resistance, can be widely applied to high-temperature environments, and has high practicability.
Description
Technical Field
The invention relates to the technical field of cable processing, in particular to a high-strength heat-resistant cable and a preparation method thereof.
Background
Cables, typically rope-like cables, are formed by stranding several or several groups of conductors (at least two in each group), each group being insulated from each other and often twisted around a center, the entire outer surface being coated with a highly insulating coating. The cable includes power cable, control cable, compensation cable, shielding cable, high-temperature cable, computer cable, signal cable, coaxial cable, fire-resistant cable, marine cable, mining cable, aluminum alloy cable and the like.
With the development of social economy, cables enter our lives and are widely used in industrial and civil electric facilities, and in practical application, the cables are often used in a series of severe environments such as high temperature, high voltage and the like, so that the performance requirements on the cables are high, and the existing cables are poor in heat resistance and cannot meet the requirements of people.
In order to solve the above problems, a high-strength heat-resistant cable and a preparation method thereof are designed, which is one of the technical problems to be solved urgently.
Disclosure of Invention
The invention aims to provide a high-strength heat-resistant cable and a preparation method thereof, which aim to solve the problems in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
a high-strength heat-resistant cable comprises a cable core, an insulating sleeve and a protective sleeve, wherein the insulating sleeve is coated on the outer surface of the cable core, and the protective sleeve is coated on the outer surface of the insulating sleeve;
the protective sleeve comprises the following raw materials: by weight, 100-110 parts of natural rubber, 30-40 parts of thermoplastic polyurethane, 50-60 parts of silane coupling agent, 5-10 parts of zinc oxide, 3-6 parts of stearic acid, 3-5 parts of compatilizer, 2-3 parts of accelerator, 2-4 parts of vulcanizing agent A, 5-7 parts of white carbon black, 4-6 parts of glass fiber, 5-8 parts of mica powder, 3-5 parts of modification auxiliary agent and 18-24 parts of ethyl acetate.
The invention discloses a high-strength heat-resistant cable, which comprises a cable core, an insulating sleeve and a protective sleeve, wherein the insulating sleeve is coated on the outer surface of the cable core, and the protective sleeve is coated on the outer surface of the insulating sleeve to form the cable, wherein the cable core is prepared by a conventional processing technology.
For the insulating layer and the protective sleeve, the component proportion and the processing technology of the insulating layer and the protective sleeve are optimized in the scheme, when the protective sleeve is actually prepared, the protective sleeve comprises components such as natural rubber, thermoplastic polyurethane, a silane coupling agent, white carbon black and the like, a blending system is established through the natural rubber and the thermoplastic polyurethane, the white carbon black, glass fiber and mica powder are used as reinforcing materials, and the prepared protective sleeve has excellent mechanical properties; meanwhile, in order to improve the heat resistance of the protective sleeve, the invention also adds the modification auxiliary agent, and the heat resistance of the protective sleeve is further improved and enhanced after the treatment of the modification auxiliary agent.
According to an optimized scheme, the insulation sleeve comprises the following raw materials: by weight, 100-105 parts of methyl vinyl silicone rubber, 20-30 parts of phenyl silicone rubber, 2-4 parts of white carbon black, 80-95 parts of aluminum hydroxide, 6-8 parts of silane coupling agent, 4-6 parts of ferric oxide and 2-3 parts of vulcanizing agent B.
The invention also designs an insulating sleeve which comprises methyl vinyl silicone rubber, phenyl silicone rubber, white carbon black and other components, wherein the phenyl silicone rubber is prepared by introducing diphenyl siloxane chain links into a molecular chain of the vinyl silicone rubber, and a blending system is established by utilizing the phenyl silicone rubber and the methyl vinyl silicone rubber, so that the high-temperature resistance of the rubber insulating sleeve is improved, and the mechanical property of a polymer after blending is greatly improved; in the processing process, after the reinforcing agent white carbon black is added into the methyl vinyl silicone rubber, the silicon hydroxyl on the surface of the white carbon black can be bonded with peripheral ions to play a reinforcing role, so that the tensile strength and the elongation at break of the blending material are increased to a certain degree, and the prepared insulating sleeve has excellent mechanical properties.
According to an optimized scheme, the raw materials of each component of the modification auxiliary agent comprise: by weight, 15-25 parts of modified carbon nano tube, 5-7 parts of polyvinylpyrrolidone, 20-30 parts of modified graphene oxide and 10-15 parts of ascorbic acid.
According to an optimized scheme, the modified carbon nano tube is prepared from a carbon nano tube, concentrated sulfuric acid and concentrated nitric acid; the modified graphene oxide is prepared from graphene oxide, N-dimethylformamide, didodecyldimethylammonium bromide and ascorbic acid.
According to the optimized scheme, the vulcanizing agent A and the vulcanizing agent B are both sulfur, the accelerator is an accelerator NS, and the thermoplastic polyurethane is polyurethane E270.
According to an optimized scheme, the preparation method of the high-strength heat-resistant cable comprises the following steps:
1) preparing a cable core, an insulating sleeve and a protective sleeve;
2) the cable core is obtained, the outer surface of the cable core is coated with the insulating sleeve, and then the outer surface of the insulating sleeve is coated with the protective sleeve, so that a cable is obtained;
3) and inspecting quality, packaging and warehousing, and finishing the operation.
In an optimized scheme, the preparation steps of the protective sleeve comprise:
1) preparing materials;
2) and preparing a modification auxiliary agent:
a) taking oxidized graphene and N, N-dimethylformamide, carrying out ultrasonic dispersion for 8-15min, adding didodecyldimethylammonium bromide, stirring and reacting for 20-22h in a nitrogen environment, heating to 88-90 ℃, adding ascorbic acid, and continuing to react for 3-4h to obtain modified oxidized graphene; in the step 2), the graphene oxide is functionally modified by utilizing didodecyl dimethyl ammonium bromide and ascorbic acid to prepare modified graphene oxide;
b) placing the carbon nano tube in a mixed solution of concentrated sulfuric acid and concentrated nitric acid, carrying out ultrasonic oscillation for 1-1.2h, then placing in a water bath at the temperature of 80-83 ℃, stirring, carrying out condensation reflux for 3h, centrifuging, and filtering to obtain a modified carbon nano tube; when the modified carbon nano tube is prepared, the carbon nano tube is acidified by concentrated nitric acid and concentrated sulfuric acid, so that the hydrophilic property of the carbon nano tube is improved, the carbon nano tube is ensured to have good compatibility with components such as natural rubber and thermoplastic polyurethane in the subsequent mixing process, and the dispersibility of each component is improved during mixing; the subsequent hybridization of the modified graphene oxide and the modified carbon nano tube is facilitated;
c) mixing the modified graphene oxide and the modified carbon nano tube, performing ultrasonic dispersion for 3-4 times, wherein the ultrasonic dispersion time is 30-35min each time, centrifuging at the centrifugal rotation speed of 800-; according to the invention, the reduced graphene oxide is subjected to functional modification to obtain modified graphene oxide, so that the modified graphene oxide can be stably dispersed in an organic solvent, and then the modified carbon nano tube is added, so that on one hand, the integrity of a conjugated pi-bond structure on the tube wall of the modified carbon nano tube is ensured to the greatest extent, and the performances of the modified carbon nano tube in the aspects of mechanics, electric conduction, heat conduction and the like are reserved; on the other hand, the hybrid composition among the components is realized by utilizing the non-covalent actions such as pi-pi interaction between the modified graphene oxide sheet layer and the modified carbon nano tube, so that novel three-dimensional hybrid particles which can be uniformly dispersed in an organic solution are formed, and the subsequent bonding reaction of the hybrid particles and polyvinylpyrrolidone is facilitated;
d) adding polyvinylpyrrolidone and ascorbic acid into the material A, mixing and stirring for 10-15min, heating in an oil bath to 80-82 ℃, reacting for 4-5h, filtering, and washing with pure water for 3-4 times to obtain a modified auxiliary agent; the method comprises the following steps of preparing a modification auxiliary agent by using modified graphene oxide, a modified carbon nano tube and polyvinylpyrrolidone as raw materials and ascorbic acid as a reducing agent and a protonation reagent through a one-step method, wherein the polyvinylpyrrolidone can react with hydroxyl or epoxy groups on the surface of the modified graphene oxide, and amide groups on the polyvinylpyrrolidone are broken and opened to form new chemical bonds, so that the polyvinylpyrrolidone is bonded on the surface of the modified graphene through covalent bonds; similarly, the polyvinylpyrrolidone can also react with the groups on the surface of the modified carbon nanotube and is grafted on the surface of the modified carbon nanotube;
3) placing the modified auxiliary agent and the ethyl acetate solution in a water bath at 25-30 ℃, stirring for 2-2.5h under the protection of nitrogen, adding white carbon black, glass fiber and mica powder, heating to 45 ℃, continuing stirring for 1-2h, and vacuum drying at 30-35 ℃ to obtain a material B; after the preparation of the modified auxiliary agent is finished, the modified auxiliary agent, the white carbon black, the glass fiber and other materials are mixed and reacted with each other to obtain a material B, the surface of the white carbon black contains a large amount of silanol hydroxyl groups, the silanol hydroxyl groups are acidic to a certain degree, and the silanol hydroxyl groups can adsorb a vulcanization accelerator (NS) in the subsequent process and even react with an alkaline accelerator, so that the subsequent vulcanization reaction rate and the vulcanization degree are greatly reduced; according to the preparation method, a mixing step is designed, and the ketone group and the hydroxyl group contained in the modified auxiliary agent can form hydrogen bonds with the silanol hydroxyl group on the surface of the white carbon black, so that the adsorption of the silanol hydroxyl group on the vulcanization accelerator is reduced, therefore, after the treatment in the step, the obtained material B can greatly improve the vulcanization reaction rate, the vulcanization degree is improved, and the heat resistance and the aging resistance of the prepared protective sleeve are greatly improved;
4) adding natural rubber into an internal mixer, carrying out internal mixing for 2-4min, adding the material B and thermoplastic polyurethane, carrying out internal mixing for 2-4min, adding a silane coupling agent, zinc oxide, stearic acid, an accelerator and a compatilizer, carrying out internal mixing for 3-5min, wherein the internal mixing temperature is 85-90 ℃, and the rotating speed is 70-75r/min, so as to obtain a material D;
5) putting the material D into an open mill, open milling for 30-50min, adding a vulcanizing agent, putting the mixture into a flat vulcanizing machine for vulcanizing at the vulcanizing temperature of 150 ℃ and 200 ℃ for 15-25min, and cooling to obtain a protective sleeve; step 4) -5) mixing the raw materials of the components to obtain the protective sleeve with excellent mechanical property and heat resistance, and the modified auxiliary agent has a large number of unsaturated bonds due to the unique structure of the modified auxiliary agent, so that the protective sleeve can generate a large number of free radicals at high temperature, and the modified auxiliary agent can timely remove the free radicals generated in the thermal ageing process, thereby effectively delaying the ageing process of the protective sleeve and having excellent ageing resistance;
according to an optimized scheme, the preparation steps of the insulation sleeve comprise:
(I) putting methyl vinyl silicone rubber and phenyl silicone rubber into an internal mixer for plasticating for 3-5min at the plasticating temperature of 60-80 ℃, adding white carbon black, aluminum hydroxide, a silane coupling agent, ferric oxide and a vulcanizing agent, and mixing for 1-2h to obtain a mixed material;
(II) placing the mixed material in a flat vulcanizing machine for vulcanization at the vulcanization temperature of 160-170 ℃ for 1-1.5h, and cooling to obtain the insulating sleeve.
In an optimized scheme, in the step 2), the preparation method of the graphene oxide comprises the following steps: mixing phosphoric acid and concentrated sulfuric acid, placing in an ice-water bath, stirring for 10-20min, adding crystalline flake graphite, continuously stirring for 10-20min, slowly adding potassium permanganate, heating to 48-52 ℃, stirring for 30-40min, centrifuging, and freeze-drying to obtain graphene oxide.
According to an optimized scheme, in the step b) of the step 2), the volume ratio of concentrated sulfuric acid to concentrated nitric acid is 3: (1-1.5).
Compared with the prior art, the invention has the beneficial effects that:
the invention discloses a high-strength heat-resistant cable and a preparation method thereof, the process design is reasonable, the operation is simple, the prepared cable has excellent mechanical properties, high strength and excellent heat resistance, can be widely applied to high-temperature environments, and has high practicability.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
a high-strength heat-resistant cable comprises a cable core, an insulating sleeve and a protective sleeve, wherein the insulating sleeve is coated on the outer surface of the cable core, and the protective sleeve is coated on the outer surface of the insulating sleeve;
each component of the protective sleeve comprises the following raw materials: by weight, 100 parts of natural rubber, 30 parts of thermoplastic polyurethane, 50 parts of silane coupling agent, 5 parts of zinc oxide, 3 parts of stearic acid, 3 parts of compatilizer, 2 parts of accelerator, 2 parts of vulcanizing agent A, 5 parts of white carbon black, 4 parts of glass fiber, 5 parts of mica powder, 3-5 parts of modification auxiliary agent and 18 parts of ethyl acetate;
the insulating sleeve comprises the following raw materials: by weight, 100 parts of methyl vinyl silicone rubber, 20 parts of phenyl silicone rubber, 2 parts of white carbon black, 80 parts of aluminum hydroxide, 6 parts of silane coupling agent, 4 parts of ferric oxide and 2 parts of vulcanizing agent B;
the raw materials of each component of the modification auxiliary agent comprise: by weight, 15 parts of modified carbon nano tube, 5 parts of polyvinylpyrrolidone, 20 parts of modified graphene oxide and 10 parts of ascorbic acid; wherein, the vulcanizing agent A and the vulcanizing agent B are sulfur, the accelerant is an accelerant NS, and the thermoplastic polyurethane is polyurethane E270.
A preparation method of a high-strength heat-resistant cable line comprises the following steps:
s1: preparing a cable core, an insulating sleeve and a protective sleeve;
s11: preparing a cable core;
s12: preparing an insulating sleeve:
putting methyl vinyl silicone rubber and phenyl silicone rubber into an internal mixer for plasticating for 3min at the plasticating temperature of 60 ℃, adding white carbon black, aluminum hydroxide, a silane coupling agent, ferric oxide and a vulcanizing agent, and mixing for 1h to obtain a mixed material; and (3) placing the mixed material in a flat vulcanizing machine for vulcanization at the vulcanization temperature of 160 ℃ for 1h, and cooling to obtain the insulating sleeve.
: preparation of protective sleeve
S131: preparing a modification auxiliary agent:
mixing phosphoric acid and concentrated sulfuric acid, placing in an ice-water bath, stirring for 10min, adding crystalline flake graphite, continuously stirring for 10min, slowly adding potassium permanganate, heating to 48 ℃, stirring for 30min, centrifuging, and freeze-drying to obtain graphene oxide;
taking graphene oxide and N, N-dimethylformamide, carrying out ultrasonic dispersion for 8min, adding didodecyl dimethyl ammonium bromide, stirring and reacting for 20h in a nitrogen environment, heating to 88 ℃, adding ascorbic acid, and continuing to react for 3h to obtain modified graphene oxide;
placing a carbon nano tube in a mixed solution of concentrated sulfuric acid and concentrated nitric acid, carrying out ultrasonic oscillation for 1h, then placing in a water bath at the temperature of 80-83 ℃, stirring, carrying out condensation reflux for 3h, centrifuging, and filtering to obtain a modified carbon nano tube; wherein the volume ratio of the concentrated sulfuric acid to the concentrated nitric acid is 3: 1;
mixing modified graphene oxide and a modified carbon nanotube, performing ultrasonic dispersion for 3 times, wherein the ultrasonic dispersion time is 30min each time, and centrifuging at a centrifugal rotation speed of 800r/min for 4min to obtain a material A;
adding polyvinylpyrrolidone and ascorbic acid into the material A, mixing and stirring for 10min, heating to 80 ℃ in an oil bath, reacting for 4h, filtering, and washing for 3 times with pure water to obtain a modified auxiliary agent;
s132: placing the modified auxiliary agent and the ethyl acetate solution in a water bath at 25 ℃, stirring for 2 hours under the protection of nitrogen, adding white carbon black, glass fiber and mica powder, heating to 45 ℃, continuing stirring for 1 hour, and drying in vacuum at 30 ℃ to obtain a material B;
s133: putting natural rubber into an internal mixer, carrying out internal mixing for 2min, adding the material B and the thermoplastic polyurethane, continuing the internal mixing for 2min, adding a silane coupling agent, zinc oxide, stearic acid, an accelerant and a compatilizer, continuing the internal mixing for 3min, wherein the internal mixing temperature is 85 ℃, and the rotating speed is 70r/min, so as to obtain a material D; and putting the material D into an open mill, open milling for 30min, adding a vulcanizing agent, putting the mixture into a flat vulcanizing machine for vulcanizing at the vulcanizing temperature of 150 ℃ for 15min, and cooling to obtain the protective sleeve.
: taking a cable core, coating an insulating sleeve on the outer surface of the cable core, and coating a protective sleeve on the outer surface of the insulating sleeve to obtain a cable;
s3: quality inspection, packaging and warehousing, and finishing the operation.
Example 2:
a high-strength heat-resistant cable comprises a cable core, an insulating sleeve and a protective sleeve, wherein the insulating sleeve is coated on the outer surface of the cable core, and the protective sleeve is coated on the outer surface of the insulating sleeve;
each component of the protective sleeve comprises the following raw materials: 105 parts of natural rubber, 36 parts of thermoplastic polyurethane, 50-60 parts of silane coupling agent, 8 parts of zinc oxide, 5 parts of stearic acid, 4 parts of compatilizer, 2.5 parts of accelerator, 3 parts of vulcanizing agent A, 6 parts of white carbon black, 5 parts of glass fiber, 7 parts of mica powder, 4 parts of modification auxiliary agent and 20 parts of ethyl acetate;
the insulating sleeve comprises the following raw materials: 102 parts of methyl vinyl silicone rubber, 25 parts of phenyl silicone rubber, 3 parts of white carbon black, 88 parts of aluminum hydroxide, 7 parts of silane coupling agent, 5 parts of ferric oxide and 2.5 parts of vulcanizing agent B by weight;
the raw materials of each component of the modification auxiliary agent comprise: by weight, 20 parts of modified carbon nano tube, 6 parts of polyvinylpyrrolidone, 25 parts of modified graphene oxide and 12 parts of ascorbic acid; wherein, the vulcanizing agent A and the vulcanizing agent B are sulfur, the accelerant is an accelerant NS, and the thermoplastic polyurethane is polyurethane E270.
A preparation method of a high-strength heat-resistant cable line comprises the following steps:
s1: preparing a cable core, an insulating sleeve and a protective sleeve;
s11: preparing a cable core;
s12: preparing an insulating sleeve:
putting methyl vinyl silicone rubber and phenyl silicone rubber into an internal mixer for plasticating for 4min at the plasticating temperature of 70 ℃, adding white carbon black, aluminum hydroxide, a silane coupling agent, ferric oxide and a vulcanizing agent, and mixing for 1.5h to obtain a mixed material; and (3) placing the mixed material into a flat vulcanizing machine for vulcanization at the vulcanization temperature of 165 ℃ for 1.2h, and cooling to obtain the insulating sleeve.
: preparation of protective sleeve
S131: preparing a modification auxiliary agent:
mixing phosphoric acid and concentrated sulfuric acid, placing in an ice-water bath, stirring for 15min, adding crystalline flake graphite, continuously stirring for 15min, slowly adding potassium permanganate, heating to 50 ℃, stirring for 35min, centrifuging, and freeze-drying to obtain graphene oxide;
taking graphene oxide and N, N-dimethylformamide, carrying out ultrasonic dispersion for 12min, adding didodecyl dimethyl ammonium bromide, stirring and reacting for 21h in a nitrogen environment, heating to 89 ℃, adding ascorbic acid, and continuing to react for 3.5h to obtain modified graphene oxide;
placing a carbon nano tube in a mixed solution of concentrated sulfuric acid and concentrated nitric acid, carrying out ultrasonic oscillation for 1.1h, then placing in a water bath at the temperature of 80-83 ℃, stirring, carrying out condensation reflux for 3h, centrifuging, and filtering to obtain a modified carbon nano tube; wherein the volume ratio of the concentrated sulfuric acid to the concentrated nitric acid is 3: 1.2;
mixing modified graphene oxide and a modified carbon nanotube, performing ultrasonic dispersion for 4 times, wherein the ultrasonic dispersion time is 32min each time, and centrifuging at a centrifugal rotation speed of 850r/min for 5min to obtain a material A;
adding polyvinylpyrrolidone and ascorbic acid into the material A, mixing and stirring for 12min, heating to 81 ℃ in an oil bath, reacting for 4-5h, filtering, and washing for 3 times with pure water to obtain a modified auxiliary agent;
s132: placing the modified auxiliary agent and the ethyl acetate solution in a water bath at 28 ℃, stirring for 2.3 hours under the protection of nitrogen, adding white carbon black, glass fiber and mica powder, heating to 45 ℃, continuing stirring for 1.2 hours, and drying in vacuum at 32 ℃ to obtain a material B;
s133: putting natural rubber into an internal mixer, carrying out internal mixing for 3min, adding the material B and the thermoplastic polyurethane, continuing the internal mixing for 3min, adding a silane coupling agent, zinc oxide, stearic acid, an accelerant and a compatilizer, continuing the internal mixing for 4min, wherein the internal mixing temperature is 88 ℃, and the rotating speed is 73r/min, so as to obtain a material D; and putting the material D into an open mill, open milling for 40min, adding a vulcanizing agent, putting the mixture into a flat vulcanizing machine for vulcanizing at the vulcanizing temperature of 180 ℃ for 20min, and cooling to obtain the protective sleeve.
: taking a cable core, coating an insulating sleeve on the outer surface of the cable core, and coating a protective sleeve on the outer surface of the insulating sleeve to obtain a cable;
s3: quality inspection, packaging and warehousing, and finishing the operation.
Example 3:
a high-strength heat-resistant cable comprises a cable core, an insulating sleeve and a protective sleeve, wherein the insulating sleeve is coated on the outer surface of the cable core, and the protective sleeve is coated on the outer surface of the insulating sleeve;
each component of the protective sleeve comprises the following raw materials: by weight, 110 parts of natural rubber, 40 parts of thermoplastic polyurethane, 60 parts of silane coupling agent, 10 parts of zinc oxide, 6 parts of stearic acid, 5 parts of compatilizer, 3 parts of accelerator, 4 parts of vulcanizing agent A, 7 parts of white carbon black, 6 parts of glass fiber, 5-8 parts of mica powder, 5 parts of modification auxiliary agent and 24 parts of ethyl acetate;
the insulating sleeve comprises the following raw materials: 105 parts of methyl vinyl silicone rubber, 30 parts of phenyl silicone rubber, 4 parts of white carbon black, 95 parts of aluminum hydroxide, 8 parts of silane coupling agent, 6 parts of ferric oxide and 3 parts of vulcanizing agent B by weight;
the raw materials of each component of the modification auxiliary agent comprise: by weight, 25 parts of modified carbon nano tube, 7 parts of polyvinylpyrrolidone, 30 parts of modified graphene oxide and 15 parts of ascorbic acid; wherein, the vulcanizing agent A and the vulcanizing agent B are sulfur, the accelerant is an accelerant NS, and the thermoplastic polyurethane is polyurethane E270.
A preparation method of a high-strength heat-resistant cable line comprises the following steps:
s1: preparing a cable core, an insulating sleeve and a protective sleeve;
s11: preparing a cable core;
s12: preparing an insulating sleeve:
putting methyl vinyl silicone rubber and phenyl silicone rubber into an internal mixer for plasticating for 5min at the plasticating temperature of 80 ℃, adding white carbon black, aluminum hydroxide, a silane coupling agent, ferric oxide and a vulcanizing agent, and mixing for 2h to obtain a mixed material; and (3) placing the mixed material into a flat vulcanizing machine for vulcanization at the vulcanization temperature of 170 ℃ for 1.5h, and cooling to obtain the insulating sleeve.
: preparation of protective sleeve
S131: preparing a modification auxiliary agent:
mixing phosphoric acid and concentrated sulfuric acid, placing in an ice-water bath, stirring for 20min, adding crystalline flake graphite, continuously stirring for 20min, slowly adding potassium permanganate, heating to 52 ℃, stirring for 40min, centrifuging, and freeze-drying to obtain graphene oxide;
taking graphene oxide and N, N-dimethylformamide, carrying out ultrasonic dispersion for 15min, adding didodecyl dimethyl ammonium bromide, stirring and reacting for 22h in a nitrogen environment, heating to 90 ℃, adding ascorbic acid, and continuing to react for 4h to obtain modified graphene oxide;
placing a carbon nano tube in a mixed solution of concentrated sulfuric acid and concentrated nitric acid, carrying out ultrasonic oscillation for 1.2h, then placing in a water bath at 83 ℃, stirring, carrying out condensation reflux for 3h, centrifuging, and filtering to obtain a modified carbon nano tube; wherein the volume ratio of the concentrated sulfuric acid to the concentrated nitric acid is 3: 1.5;
mixing modified graphene oxide and a modified carbon nanotube, performing ultrasonic dispersion for 4 times, wherein the ultrasonic dispersion time is 35min each time, and centrifuging at a centrifugal speed of 900r/min for 6min to obtain a material A;
adding polyvinylpyrrolidone and ascorbic acid into the material A, mixing and stirring for 10-15min, heating in an oil bath to 82 ℃, reacting for 5h, filtering, and washing with pure water for 4 times to obtain a modified auxiliary agent;
s132: placing the modified auxiliary agent and the ethyl acetate solution in a water bath at 25-30 ℃, stirring for 2-2.5h under the protection of nitrogen, adding white carbon black, glass fiber and mica powder, heating to 45 ℃, continuing stirring for 2h, and vacuum drying at 35 ℃ to obtain a material B;
s133: putting natural rubber into an internal mixer, carrying out internal mixing for 4min, adding the material B and the thermoplastic polyurethane, continuing the internal mixing for 4min, adding a silane coupling agent, zinc oxide, stearic acid, an accelerant and a compatilizer, continuing the internal mixing for 5min, wherein the internal mixing temperature is 90 ℃, and the rotating speed is 75r/min, so as to obtain a material D; and putting the material D into an open mill, open milling for 50min, adding a vulcanizing agent, putting the mixture into a flat vulcanizing machine for vulcanizing at the vulcanizing temperature of 200 ℃ for 25min, and cooling to obtain the protective sleeve.
: taking a cable core, coating an insulating sleeve on the outer surface of the cable core, and coating a protective sleeve on the outer surface of the insulating sleeve to obtain a cable;
s3: quality inspection, packaging and warehousing, and finishing the operation.
Experiment:
the cable prepared in examples 1 to 3 was taken as samples 1 to 3, the tensile strength and elongation at break thereof were measured according to GB/T1040, respectively, and then aged in an aging oven at 120 ℃ for 72 hours to measure the tensile strength and elongation at break thereof, and then the cable was coiled on a round bar, placed in an oven at 130 ℃ for 24 hours, and taken out to measure whether the cable cracked or broken.
The experimental data are shown in the following table:
and (4) conclusion: the preparation method is reasonable in process design and simple to operate, and the prepared cable has excellent mechanical property, high strength and excellent heat resistance, can be widely applied to high-temperature environments, and has high practicability.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (10)
1. The utility model provides a high strength heat-resisting cable conductor which characterized in that: the cable comprises a cable core, an insulating sleeve and a protective sleeve, wherein the insulating sleeve is coated on the outer surface of the cable core, and the protective sleeve is coated on the outer surface of the insulating sleeve;
the protective sleeve comprises the following raw materials: by weight, 100-110 parts of natural rubber, 30-40 parts of thermoplastic polyurethane, 50-60 parts of silane coupling agent, 5-10 parts of zinc oxide, 3-6 parts of stearic acid, 3-5 parts of compatilizer, 2-3 parts of accelerator, 2-4 parts of vulcanizing agent A, 5-7 parts of white carbon black, 4-6 parts of glass fiber, 5-8 parts of mica powder, 3-5 parts of modification auxiliary agent and 18-24 parts of ethyl acetate.
2. A high strength heat resistant electric cable according to claim 1, wherein: the insulating sleeve comprises the following raw materials: by weight, 100-105 parts of methyl vinyl silicone rubber, 20-30 parts of phenyl silicone rubber, 2-4 parts of white carbon black, 80-95 parts of aluminum hydroxide, 6-8 parts of silane coupling agent, 4-6 parts of ferric oxide and 2-3 parts of vulcanizing agent B.
3. A high strength heat resistant electric cable according to claim 1, wherein: the modified auxiliary agent comprises the following raw materials in parts by weight: by weight, 15-25 parts of modified carbon nano tube, 5-7 parts of polyvinylpyrrolidone, 20-30 parts of modified graphene oxide and 10-15 parts of ascorbic acid.
4. A high strength heat resistant electric cable according to claim 3, wherein: the modified carbon nano tube is prepared from a carbon nano tube, concentrated sulfuric acid and concentrated nitric acid; the modified graphene oxide is prepared from graphene oxide, N-dimethylformamide, didodecyldimethylammonium bromide and ascorbic acid.
5. A high strength heat resistant electric cable according to claim 2, wherein: the vulcanizing agent A and the vulcanizing agent B are both sulfur, the accelerator is an accelerator NS, and the thermoplastic polyurethane is polyurethane E270.
6. A preparation method of a high-strength heat-resistant cable is characterized by comprising the following steps: the method comprises the following steps:
1) preparing a cable core, an insulating sleeve and a protective sleeve;
2) the cable core is obtained, the outer surface of the cable core is coated with the insulating sleeve, and then the outer surface of the insulating sleeve is coated with the protective sleeve, so that a cable is obtained;
3) and inspecting quality, packaging and warehousing, and finishing the operation.
7. The method for preparing a high-strength heat-resistant cable line according to claim 6, wherein the method comprises the following steps: the preparation steps of the protective sleeve comprise:
1) preparing materials;
2) and preparing a modification auxiliary agent:
a) taking oxidized graphene and N, N-dimethylformamide, carrying out ultrasonic dispersion for 8-15min, adding didodecyldimethylammonium bromide, stirring and reacting for 20-22h in a nitrogen environment, heating to 88-90 ℃, adding ascorbic acid, and continuing to react for 3-4h to obtain modified oxidized graphene;
b) placing the carbon nano tube in a mixed solution of concentrated sulfuric acid and concentrated nitric acid, carrying out ultrasonic oscillation for 1-1.2h, then placing in a water bath at the temperature of 80-83 ℃, stirring, carrying out condensation reflux for 3h, centrifuging, and filtering to obtain a modified carbon nano tube;
c) mixing the modified graphene oxide and the modified carbon nano tube, performing ultrasonic dispersion for 3-4 times, wherein the ultrasonic dispersion time is 30-35min each time, centrifuging at the centrifugal rotation speed of 800-;
d) adding polyvinylpyrrolidone and ascorbic acid into the material A, mixing and stirring for 10-15min, heating in an oil bath to 80-82 ℃, reacting for 4-5h, filtering, and washing with pure water for 3-4 times to obtain a modified auxiliary agent;
3) placing the modified auxiliary agent and the ethyl acetate solution in a water bath at 25-30 ℃, stirring for 2-2.5h under the protection of nitrogen, adding white carbon black, glass fiber and mica powder, heating to 45 ℃, continuing stirring for 1-2h, and vacuum drying at 30-35 ℃ to obtain a material B;
4) adding natural rubber into an internal mixer, carrying out internal mixing for 2-4min, adding the material B and thermoplastic polyurethane, carrying out internal mixing for 2-4min, adding a silane coupling agent, zinc oxide, stearic acid, an accelerator and a compatilizer, carrying out internal mixing for 3-5min, wherein the internal mixing temperature is 85-90 ℃, and the rotating speed is 70-75r/min, so as to obtain a material D;
5) and putting the material D into an open mill, open milling for 30-50min, adding a vulcanizing agent, putting the mixture into a flat vulcanizing machine for vulcanizing at the vulcanizing temperature of 150 ℃ and 200 ℃ for 15-25min, and cooling to obtain the protective sleeve.
8. The method for preparing a high-strength heat-resistant cable line according to claim 6, wherein the method comprises the following steps: the preparation steps of the insulating sleeve comprise:
(I) putting methyl vinyl silicone rubber and phenyl silicone rubber into an internal mixer for plasticating for 3-5min at the plasticating temperature of 60-80 ℃, adding white carbon black, aluminum hydroxide, a silane coupling agent, ferric oxide and a vulcanizing agent, and mixing for 1-2h to obtain a mixed material;
(II) placing the mixed material in a flat vulcanizing machine for vulcanization at the vulcanization temperature of 160-170 ℃ for 1-1.5h, and cooling to obtain the insulating sleeve.
9. The method of claim 7 for preparing a high strength heat resistant cable wire, wherein: in the step 2), the preparation method of the graphene oxide comprises the following steps: mixing phosphoric acid and concentrated sulfuric acid, placing in an ice-water bath, stirring for 10-20min, adding crystalline flake graphite, continuously stirring for 10-20min, slowly adding potassium permanganate, heating to 48-52 ℃, stirring for 30-40min, centrifuging, and freeze-drying to obtain graphene oxide.
10. The method of claim 7 for preparing a high strength heat resistant cable wire, wherein: in the step b) of the step 2), the volume ratio of concentrated sulfuric acid to concentrated nitric acid is 3: (1-1.5).
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