CN111534108A - Polypropylene pipe for buried high-voltage power cable and preparation method thereof - Google Patents
Polypropylene pipe for buried high-voltage power cable and preparation method thereof Download PDFInfo
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L87/00—Compositions of unspecified macromolecular compounds, obtained otherwise than by polymerisation reactions only involving unsaturated carbon-to-carbon bonds
- C08L87/005—Block or graft polymers not provided for in groups C08L1/00 - C08L85/04
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G83/00—Macromolecular compounds not provided for in groups C08G2/00 - C08G81/00
- C08G83/001—Macromolecular compounds containing organic and inorganic sequences, e.g. organic polymers grafted onto silica
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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
- C08L2203/18—Applications used for pipes
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- C—CHEMISTRY; METALLURGY
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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Abstract
The invention relates to the technical field of power pipelines and discloses a polypropylene pipe for a buried high-voltage power cable and a preparation method thereof, wherein the polypropylene pipe comprises the following raw materials of 100 parts of graphene modified polypropylene, 8-12 parts of polyimide, 3-5 parts of ethylene propylene diene monomer, 2-3 parts of poly-phenoxy resin, 2-5 parts of talcum powder, 6-8 parts of methyl orthosilicate, 2-3 parts of silane coupling agent, 0.2-0.4 part of antioxidant and 1-2 parts of stabilizer; during preparation, the graphene modified polypropylene is gradually heated to 120 ℃ of 100-; putting the molten mixture into an extruder for extrusion to obtain an extruded material; and D, carrying out vacuum shaping on the extruded material obtained in the step A2, cooling, drawing and cutting to obtain the polypropylene pipe. The invention can increase the impact resistance of the polypropylene power cable pipe in a low-temperature environment and has less environmental hazard.
Description
Technical Field
The invention relates to the technical field of power pipelines, in particular to a polypropylene pipe for a buried high-voltage power cable and a preparation method thereof.
Background
The polypropylene pipe is a green building material, and the polypropylene plastic is nontoxic, tasteless, light in weight and corrosion resistant; the polypropylene pipe has good dielectric property and high-frequency insulation property and is not influenced by humidity, but polypropylene becomes brittle at low temperature, is not wear-resistant and is easy to age, so that the pressure resistance and low-temperature impact resistance of the polypropylene pipe are poor, and the application of the polypropylene pipe is limited. The corrugated sheath pipe for the buried high-voltage power cable is used for fixing the high-voltage power cable and is buried under the ground, and because the stratum can be settled and the like, the sheath pipe can be impacted and stressed, so that the protection sleeve pipe for the power cable has higher toughness and impact resistance.
In order to increase the toughness and impact resistance of the polypropylene power cable pipe in a low-temperature environment, the currently adopted method is to increase the dosage of the plasticizer in the polypropylene material, but the plasticizer has higher toxicity and can enter human bodies through respiratory tracts, digestive tracts, skins and other ways, so that the environmental health hazard is larger; in the production process of the power tube, the damage to the health of human bodies is easily caused.
Disclosure of Invention
In view of the above, the present invention provides a polypropylene pipe for a buried high-voltage power cable and a preparation method thereof, which can increase the impact resistance of the polypropylene power cable pipe in a low-temperature environment and have less environmental hazard.
The invention solves the technical problems by the following technical means:
a polypropylene pipe for a buried high-voltage power cable comprises the following raw materials, by mass, 120 parts of modified polypropylene 100, 8-12 parts of polyimide, 3-5 parts of ethylene propylene diene monomer, 2-3 parts of polyphenoxy resin, 2-5 parts of talcum powder, 6-8 parts of methyl orthosilicate, 2-3 parts of silane coupling agent, 0.2-0.4 part of antioxidant and 1-2 parts of stabilizer; the modified polypropylene is graphene modified polypropylene. The polypropylene protection tube of the buried high-voltage power cable is buried underground, and the high-voltage power cable is easy to generate heat, so that the temperature in the polypropylene tube is high; therefore, the polypropylene pipe has higher requirements on heat resistance, toughness and impact resistance. The polypropylene has poor heat resistance and toughness, brittle texture and weak impact resistance, and is easy to age and crack under pressure after being heated after being prepared into a polypropylene pipe; and the toughness and the impact resistance of the polypropylene pipe can be further improved by the graphene modified polypropylene.
Further, the composite material comprises the following raw materials, by mass, 110 parts of graphene modified polypropylene, 10 parts of polyimide, 4 parts of ethylene propylene diene monomer, 2.5 parts of poly (phenoxy) resin, 3.5 parts of talcum powder, 7 parts of methyl orthosilicate, 2.5 parts of silane coupling agent, 0.3 part of antioxidant and 1.5 parts of stabilizer.
Further, the silane coupling agent is vinyl triethoxysilane, the antioxidant is antioxidant 1076, and the stabilizer is calcium stearate. The antioxidant can improve the oxidation resistance of the plastic and prolong the service life; the stabilizer can improve the stability and chemical stability of the plastic.
The invention also discloses a preparation method of the polypropylene pipe for the buried high-voltage power cable, which comprises the following steps:
a1, gradually heating graphene modified polypropylene to 120 ℃ of 100-;
a2, placing the molten mixture obtained in the step A1 in an extruder for extrusion to obtain an extrusion material, wherein the temperature of a machine head is controlled at 180-200 ℃, the traction speed is 0.8-1.0m/min, and the rotating speed of a main machine is 20-24 r/min;
and A3, carrying out vacuum shaping on the extruded material obtained in the step A2, cooling, drawing and cutting to obtain the polypropylene tube.
Further, the preparation method of the graphene modified polypropylene comprises the following steps,
b1, ultrasonically dispersing 2-4 parts of graphene in 100-120 parts of deionized water by mass, and cleaning, filtering and drying to obtain pollution-free graphene;
b2, taking 30-50 parts of polypropylene, ultrasonically dispersing in 220 parts of diethyl ether by mass, then adding 1-2 parts of lithium alkyl under the protection of nitrogen, and continuously ultrasonically dispersing to obtain a polypropylene monomer mixed solution;
and B3, adding the graphene obtained in the step B1 into the polypropylene monomer mixed solution obtained in the step B2, heating to 40-50 ℃, and reacting for 5-7 hours to obtain the graphene modified polypropylene.
In the reaction, Li+As a charged intermediate, the charged intermediate is continuously replaced on the surfaces of polypropylene and graphene, a polypropylene molecular chain is grafted to the graphene with a net structure, the graphene is of the net structure, and the polypropylene molecular chain with a linear structure is continuously grafted on each cross joint on the graphene with the net structure, so that the cross joint and aggregation of a large number of molecules are generated, the acting force among the molecules is firmer, and the tensile property of the produced polypropylene pipe is stronger.
Further, the alkyl lithium is methyl lithium. The lithium has low toxicity and little influence on human body and environment.
Further, after the step B1, adding the pollution-free graphene into a mixture of nitric acid and concentrated sulfuric acid, and performing ultrasonic dispersion for 8-10min, wherein the volume ratio of the nitric acid to the concentrated sulfuric acid is 1:2, the mass of the mixture of nitric acid and concentrated sulfuric acid is 3-5 parts, the concentrated sulfuric acid is the concentrated sulfuric acid with the volume concentration of 98%, and the nitric acid is the nitric acid with the volume concentration of 68%. The graphene is added into the mixed solution of concentrated sulfuric acid and nitric acid for ultrasonic dispersion, and the chemical activity of the graphene is increased under the action of strong oxidation, so that grafting of polypropylene on a graphene net structure is facilitated.
Further, inserting a cathode electrode plate and an anode electrode plate into the mixed liquid obtained in the step B3, and switching on alternating current to the anode electrode plate and the cathode electrode plate, wherein the voltage of the alternating current to the anode electrode plate and the cathode electrode plate is 18-36V, the current is 1-2A, and the time is 30-60 min.
Further, the frequency of alternating current which is conducted between the anode electrode plate and the cathode electrode plate is 1-3 Hz.
The invention has the beneficial effects that:
according to the invention, the graphene modified polypropylene material is added into the power cable polypropylene pipe, and Li is added during the preparation of the graphene modified polypropylene material+As an electrified intermediate, the surface of polypropylene and graphene is continuously replaced, a polypropylene molecular chain is grafted to graphene with a net structure, the graphene is of the net structure, the polypropylene molecular chain with a linear structure is continuously grafted on each cross joint point on the graphene with the net structure, and therefore, the cross joint and aggregation of a large number of molecules are generated, so that the acting force among the molecules is firmer, the tensile resistance of the produced polypropylene pipe is stronger, and the impact resistance of the polypropylene power cable pipe in a low-temperature environment can be met.
Detailed Description
The present invention will be described in detail below with reference to examples 1 to 3:
examples 1,
The preparation method of the polypropylene pipe for the buried high-voltage power cable comprises the following steps:
s1, ultrasonically dispersing 2kg of graphene in 100kg of deionized water, and cleaning, filtering and drying to obtain pollution-free graphene; then, adding pollution-free graphene into a mixture of nitric acid and concentrated sulfuric acid, and performing ultrasonic dispersion for 8min, wherein the volume ratio of the nitric acid to the concentrated sulfuric acid is 1:2, the mass of the mixture of the nitric acid and the concentrated sulfuric acid is 3kg, the concentrated sulfuric acid is the concentrated sulfuric acid with the volume concentration of 98%, and the nitric acid is the nitric acid with the volume concentration of 68%;
s2, taking 30kg of polypropylene, ultrasonically dispersing in 200kg of diethyl ether, then adding alkyl lithium under the protection of nitrogen, and continuing to ultrasonically disperse to obtain a polypropylene monomer mixed solution;
s3, adding the graphene obtained in the step S1 into the polypropylene monomer mixed solution obtained in the step S2, heating to 40 ℃, inserting a cathode electrode plate and an anode electrode plate into the mixed solution, connecting alternating current to the anode electrode plate and the cathode electrode plate, wherein the frequency of the alternating current is 1Hz, the voltage for connecting the anode electrode plate and the cathode electrode plate is 18V, the current is 1A, the time is 30min, and reacting for 5h to obtain the graphene modified polypropylene.
S4, gradually heating graphene modified polypropylene to 100 ℃, then adding 8kg of polyimide, 3kg of ethylene propylene diene monomer, 2kg of polyphenoxy resin, 2kg of talcum powder, 6kg of methyl orthosilicate, 2kg of vinyltriethoxysilane, 0.2kg of antioxidant 1076 and 1kg of calcium stearate, stirring, melting and mixing to obtain a molten mixture;
s5, placing the molten mixture obtained in the step S4 in an extruder to extrude to obtain an extruded material, wherein the temperature of a machine head is controlled at 180 ℃, the traction speed is 0.8m/min, and the rotating speed of a main machine is 20 r/min;
and S6, carrying out vacuum shaping on the extruded material obtained in the step S5, cooling, drawing and cutting to obtain the polypropylene tube.
Examples 2,
The preparation method of the polypropylene pipe for the buried high-voltage power cable comprises the following steps:
s1, ultrasonically dispersing 3kg of graphene in 110kg of deionized water, and cleaning, filtering and drying to obtain pollution-free graphene; then, adding pollution-free graphene into a mixture of nitric acid and concentrated sulfuric acid, and performing ultrasonic dispersion for 9min, wherein the volume ratio of the nitric acid to the concentrated sulfuric acid is 1:2, the mass of the mixture of the nitric acid and the concentrated sulfuric acid is 4kg, the concentrated sulfuric acid is the concentrated sulfuric acid with the volume concentration of 98%, and the nitric acid is the nitric acid with the volume concentration of 68%;
s2, taking 40kg of polypropylene, ultrasonically dispersing in 210kg of diethyl ether, adding alkyl lithium under the protection of nitrogen, and continuously ultrasonically dispersing to obtain a polypropylene monomer mixed solution;
s3, adding the graphene obtained in the step S1 into the polypropylene monomer mixed solution obtained in the step S2, heating to 45 ℃, inserting a cathode electrode plate and an anode electrode plate into the mixed solution, connecting alternating current to the anode electrode plate and the cathode electrode plate, wherein the frequency of the alternating current is 2Hz, the voltage for connecting the anode electrode plate and the cathode electrode plate is 27V, the current is 1.5A, the time is 45min, and reacting for 6h to obtain the graphene modified polypropylene.
S4, gradually heating the graphene modified polypropylene to 110 ℃, then adding 10kg of polyimide, 4kg of ethylene propylene diene monomer, 2.5kg of poly (phenol-oxy) resin, 3.5kg of talcum powder, 7kg of methyl orthosilicate, 2.5kg of vinyl triethoxysilane, 0.3kg of antioxidant 1076 and 1.5kg of calcium stearate, stirring, melting and mixing to obtain a molten mixture;
s5, placing the molten mixture obtained in the step S4 in an extruder to be extruded to obtain an extruded material, wherein the temperature of a machine head is controlled at 190 ℃, the traction speed is 0.9m/min, and the rotating speed of a main machine is 22 r/min;
and S6, carrying out vacuum shaping on the extruded material obtained in the step S5, cooling, drawing and cutting to obtain the polypropylene tube.
Examples 3,
The preparation method of the polypropylene pipe for the buried high-voltage power cable comprises the following steps:
s1, ultrasonically dispersing 4kg of graphene in 120kg of deionized water, cleaning, filtering and drying to obtain pollution-free graphene; then, adding pollution-free graphene into a mixture of nitric acid and concentrated sulfuric acid, and performing ultrasonic dispersion for 10min, wherein the volume ratio of the nitric acid to the concentrated sulfuric acid is 1:2, the mass of the mixture of the nitric acid and the concentrated sulfuric acid is 5kg, the concentrated sulfuric acid is the concentrated sulfuric acid with the volume concentration of 98%, and the nitric acid is the nitric acid with the volume concentration of 68%;
s2, taking 50kg of polypropylene, ultrasonically dispersing in 220kg of diethyl ether, then adding alkyl lithium under the protection of nitrogen, and continuing to ultrasonically disperse to obtain a polypropylene monomer mixed solution;
s3, adding the graphene obtained in the step S1 into the polypropylene monomer mixed solution obtained in the step S2, heating to 50 ℃, inserting a cathode electrode plate and an anode electrode plate into the mixed solution, connecting alternating current to the anode electrode plate and the cathode electrode plate, wherein the frequency of the alternating current is 3Hz, the voltage for connecting the anode electrode plate and the cathode electrode plate is 36V, the current is 2A, the time is 60min, and reacting for 7h to obtain the graphene modified polypropylene.
S4, gradually heating the graphene modified polypropylene to 120 ℃, then adding 12kg of polyimide, 5kg of ethylene propylene diene monomer, 3kg of polyphenoxy resin, 5kg of talcum powder, 8kg of methyl orthosilicate, 3kg of vinyl triethoxysilane, 0.4kg of antioxidant 1076 and 2kg of calcium stearate, stirring, melting and mixing to obtain a molten mixture;
s5, placing the molten mixture obtained in the step S4 in an extruder to extrude to obtain an extruded material, wherein the temperature of a machine head is controlled at 200 ℃, the traction speed is 1.0m/min, and the rotating speed of a main machine is 24 r/min;
and S6, carrying out vacuum shaping on the extruded material obtained in the step S5, cooling, drawing and cutting to obtain the polypropylene tube.
After the polypropylene pipes for power cables of examples 1-3 were prepared, tensile strength indexes at 25 ℃, 0 ℃, 10 ℃ and 25 ℃ were measured for the polypropylene pipes of the three examples, and the test method was determined according to the national standard GB/T1040-92. The detection instrument used therein was: a universal electronic experiment machine (WDW-1002 type), and the stretching speed is controlled at 10 mm/min.
The final assay data is shown in the following table:
from the above test results, it can be seen that:
1. from the comparison between example 1 and examples 2 and 3, it can be seen that the power cable pipe produced by using the power cable polypropylene pipe formulation of example 2 has the best tensile strength.
2. From the comparison of examples 1-3 with the currently commonly used polypropylene tube, it can be seen that the tensile strength of the polypropylene tube of the present invention is superior to that of the currently commonly used polypropylene tube.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims. The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.
Claims (9)
1. The utility model provides a polypropylene pipe for buried high voltage power cable which characterized in that: the material comprises, by mass, 120 parts of modified polypropylene 100-one, 8-12 parts of polyimide, 3-5 parts of ethylene propylene diene monomer, 2-3 parts of poly (phenoxy) resin, 2-5 parts of talcum powder, 6-8 parts of methyl orthosilicate, 2-3 parts of silane coupling agent, 0.2-0.4 part of antioxidant and 1-2 parts of stabilizer; the modified polypropylene is graphene modified polypropylene.
2. The polypropylene tube for the buried high-voltage power cable according to claim 1, wherein: the polypropylene pipe comprises the following raw materials, by mass, 110 parts of graphene modified polypropylene, 10 parts of polyimide, 4 parts of ethylene propylene diene monomer, 2.5 parts of poly (phenoxy) resin, 3.5 parts of talcum powder, 7 parts of methyl orthosilicate, 2.5 parts of silane coupling agent, 0.3 part of antioxidant and 1.5 parts of stabilizer.
3. A polypropylene tube for buried high voltage power cable according to claim 2, wherein: the silane coupling agent is vinyl triethoxysilane, the antioxidant is antioxidant 1076, and the stabilizer is calcium stearate.
4. The preparation method of the polypropylene pipe for the buried high-voltage power cable according to claim 3, wherein the preparation method comprises the following steps: the method comprises the following steps:
a1, gradually heating graphene modified polypropylene to 120 ℃ of 100-;
a2, placing the molten mixture obtained in the step A1 in an extruder for extrusion to obtain an extrusion material, wherein the temperature of a machine head is controlled at 180-200 ℃, the traction speed is 0.8-1.0m/min, and the rotating speed of a main machine is 20-24 r/min;
and A3, carrying out vacuum shaping on the extruded material obtained in the step A2, cooling, drawing and cutting to obtain the polypropylene tube.
5. The preparation method of the polypropylene pipe for the buried high-voltage power cable according to claim 4, wherein the preparation method comprises the following steps: the preparation method of the graphene modified polypropylene comprises the following steps,
b1, ultrasonically dispersing 2-4 parts of graphene in 100-120 parts of deionized water by mass, and cleaning, filtering and drying to obtain pollution-free graphene;
b2, taking 30-50 parts of polypropylene, ultrasonically dispersing in 220 parts of diethyl ether by mass, then adding 1-2 parts of lithium alkyl under the protection of nitrogen, and continuously ultrasonically dispersing to obtain a polypropylene monomer mixed solution;
and B3, adding the graphene obtained in the step B1 into the polypropylene monomer mixed solution obtained in the step B2, heating to 40-50 ℃, and reacting for 5-7 hours to obtain the graphene modified polypropylene.
6. The preparation method of the polypropylene pipe for the buried high-voltage power cable according to claim 5, wherein the preparation method comprises the following steps: the alkyl lithium is methyl lithium.
7. The preparation method of the polypropylene pipe for the buried high-voltage power cable according to claim 6, wherein the preparation method comprises the following steps: and B1, adding the pollution-free graphene into a mixture of nitric acid and concentrated sulfuric acid, and ultrasonically dispersing for 8-10min, wherein the volume ratio of the nitric acid to the concentrated sulfuric acid is 1:2, the mass of the mixture of the nitric acid and the concentrated sulfuric acid is 3-5 parts, the concentrated sulfuric acid is the concentrated sulfuric acid with the volume concentration of 98%, and the nitric acid is the nitric acid with the volume concentration of 68%.
8. The preparation method of the polypropylene pipe for the buried high-voltage power cable according to claim 7, wherein the preparation method comprises the following steps: inserting a cathode electrode plate and an anode electrode plate into the mixed liquid obtained in the step B3, and switching on alternating current to the anode electrode plate and the cathode electrode plate, wherein the voltage of the anode electrode plate and the cathode electrode plate is 18-36V, the current is 1-2A, and the time is 30-60 min.
9. The preparation method of the polypropylene pipe for the buried high-voltage power cable according to claim 8, wherein the preparation method comprises the following steps: the frequency of the alternating current which is conducted between the anode electrode plate and the cathode electrode plate is 1-3 Hz.
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Application publication date: 20200814 |