CN113652018A - High-strength polyethylene gas pipeline and preparation method thereof - Google Patents
High-strength polyethylene gas pipeline and preparation method thereof Download PDFInfo
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- CN113652018A CN113652018A CN202110694617.8A CN202110694617A CN113652018A CN 113652018 A CN113652018 A CN 113652018A CN 202110694617 A CN202110694617 A CN 202110694617A CN 113652018 A CN113652018 A CN 113652018A
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- 239000004698 Polyethylene Substances 0.000 title claims abstract description 59
- 229920000573 polyethylene Polymers 0.000 title claims abstract description 59
- -1 polyethylene Polymers 0.000 title claims abstract description 58
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 239000002131 composite material Substances 0.000 claims abstract description 36
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 32
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 20
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 20
- PYSRRFNXTXNWCD-UHFFFAOYSA-N 3-(2-phenylethenyl)furan-2,5-dione Chemical compound O=C1OC(=O)C(C=CC=2C=CC=CC=2)=C1 PYSRRFNXTXNWCD-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229920000147 Styrene maleic anhydride Polymers 0.000 claims abstract description 15
- 239000006087 Silane Coupling Agent Substances 0.000 claims abstract description 13
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000003063 flame retardant Substances 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 10
- OXDXXMDEEFOVHR-CLFAGFIQSA-N (z)-n-[2-[[(z)-octadec-9-enoyl]amino]ethyl]octadec-9-enamide Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)NCCNC(=O)CCCCCCC\C=C/CCCCCCCC OXDXXMDEEFOVHR-CLFAGFIQSA-N 0.000 claims abstract description 8
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical class C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 34
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 33
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 33
- 239000002134 carbon nanofiber Substances 0.000 claims description 24
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 238000003756 stirring Methods 0.000 claims description 21
- 229910021389 graphene Inorganic materials 0.000 claims description 19
- 239000008367 deionised water Substances 0.000 claims description 18
- 229910021641 deionized water Inorganic materials 0.000 claims description 18
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 18
- 238000006243 chemical reaction Methods 0.000 claims description 16
- 239000000243 solution Substances 0.000 claims description 16
- 238000004140 cleaning Methods 0.000 claims description 15
- 239000012065 filter cake Substances 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 13
- 238000004321 preservation Methods 0.000 claims description 11
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 10
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 10
- 238000001914 filtration Methods 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000013329 compounding Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 8
- 239000002253 acid Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 239000000047 product Substances 0.000 claims description 7
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims description 6
- 238000007654 immersion Methods 0.000 claims description 6
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims description 6
- STZCRXQWRGQSJD-GEEYTBSJSA-M methyl orange Chemical compound [Na+].C1=CC(N(C)C)=CC=C1\N=N\C1=CC=C(S([O-])(=O)=O)C=C1 STZCRXQWRGQSJD-GEEYTBSJSA-M 0.000 claims description 6
- 229940012189 methyl orange Drugs 0.000 claims description 6
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 5
- 239000012153 distilled water Substances 0.000 claims description 5
- SWSBIGKFUOXRNJ-CVBJKYQLSA-N ethene;(z)-octadec-9-enamide Chemical compound C=C.CCCCCCCC\C=C/CCCCCCCC(N)=O.CCCCCCCC\C=C/CCCCCCCC(N)=O SWSBIGKFUOXRNJ-CVBJKYQLSA-N 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 5
- 229910017604 nitric acid Inorganic materials 0.000 claims description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 5
- 238000010257 thawing Methods 0.000 claims description 5
- 238000009210 therapy by ultrasound Methods 0.000 claims description 5
- 238000001291 vacuum drying Methods 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- 238000005303 weighing Methods 0.000 claims description 5
- 239000000654 additive Substances 0.000 claims description 4
- 230000000996 additive effect Effects 0.000 claims description 4
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 4
- 229910002804 graphite Inorganic materials 0.000 claims description 4
- 239000010439 graphite Substances 0.000 claims description 4
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 4
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 4
- 239000000347 magnesium hydroxide Substances 0.000 claims description 4
- 238000010992 reflux Methods 0.000 claims description 4
- 230000007935 neutral effect Effects 0.000 claims description 3
- 238000000967 suction filtration Methods 0.000 claims description 3
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 2
- 150000001412 amines Chemical class 0.000 claims description 2
- 239000003999 initiator Substances 0.000 claims description 2
- 239000011259 mixed solution Substances 0.000 claims description 2
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 claims description 2
- 150000007970 thio esters Chemical class 0.000 claims description 2
- 239000011159 matrix material Substances 0.000 abstract description 10
- 239000007789 gas Substances 0.000 description 22
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 description 6
- 239000002216 antistatic agent Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 238000002791 soaking Methods 0.000 description 4
- 230000003068 static effect Effects 0.000 description 4
- 229910001870 ammonium persulfate Inorganic materials 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000002737 fuel gas Substances 0.000 description 2
- 238000009830 intercalation Methods 0.000 description 2
- 230000002687 intercalation Effects 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 150000003384 small molecules Chemical class 0.000 description 2
- JKIJEFPNVSHHEI-UHFFFAOYSA-N Phenol, 2,4-bis(1,1-dimethylethyl)-, phosphite (3:1) Chemical compound CC(C)(C)C1=CC(C(C)(C)C)=CC=C1OP(OC=1C(=CC(=CC=1)C(C)(C)C)C(C)(C)C)OC1=CC=C(C(C)(C)C)C=C1C(C)(C)C JKIJEFPNVSHHEI-UHFFFAOYSA-N 0.000 description 1
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011231 conductive filler Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- SSDSCDGVMJFTEQ-UHFFFAOYSA-N octadecyl 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)CCC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 SSDSCDGVMJFTEQ-UHFFFAOYSA-N 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/06—Polyethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/017—Additives being an antistatic agent
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/18—Applications used for pipes
-
- 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
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
Abstract
The invention discloses a high-strength polyethylene gas pipeline and a preparation method thereof, relates to the technical field of gas pipelines, and discloses the high-strength polyethylene gas pipeline which comprises the following raw materials in parts by weight: 60-80 parts of polyethylene, 15-22 parts of styrene maleic anhydride copolymer, 8 parts of ethylene bis-oleamide, 15-20 parts of composite antistatic auxiliary agent, 2-10 parts of flame retardant, 2-3 parts of polyethylene wax, 0.4-0.6 part of antioxidant and 1-2 parts of silane coupling agent. According to the high-strength polyethylene gas pipeline and the preparation method thereof, the composite antistatic auxiliary agent is used in the raw materials, and the high-strength polyethylene gas pipeline and the matrix material have good compatibility, good dispersibility and good stability.
Description
Technical Field
The invention relates to the technical field of gas pipelines, in particular to a high-strength polyethylene gas pipeline and a preparation method thereof.
Background
With the continuous acceleration of the urbanization process, the number of urban residents is increasing day by day, and the requirements on municipal infrastructure such as gas engineering and the like are also continuously improved. The gas pipe is used as a special pipeline for conveying combustible gas, and has the characteristics of convenience in installation, reliability in connection, corrosion resistance, no gas blockage, good flexibility, long service life, capability of being bent at will without deformation, no gas blockage and the like, so that higher requirements are provided for the material of the gas pipe. Among them, Polyethylene (PE) pipe presents a strong development trend as a municipal pipe in china at present.
The polyethylene has high resistance which can reach 1010-1020Ohm, when using as the gas pipe, gas and tubular product take place the friction, accumulate static easily on tubular product, if the static of accumulation can not in time be derived, produce the explosion easily, have very big potential safety hazard. Therefore, when a polyethylene gas pipe is prepared, an antistatic agent is often required to be added into a polyethylene base, but most of the traditional antistatic agent belongs to small molecules, and after the antistatic agent is added into the polyethylene base, the antistatic agent is unstable and is easy to separate out, and the problem that the mechanical property of polyethylene is reduced due to the fact that inorganic small molecule conductive filler is poor in compatibility with polyethylene exists.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a high strength polyethylene gas pipeline and a preparation method thereof, wherein the raw materials use a composite antistatic additive, and the composite antistatic additive has good compatibility with a matrix material, good dispersibility and good stability.
The invention solves the technical problems by the following technical means:
a composite antistatic auxiliary agent is added into raw materials of the high-strength polyethylene gas pipeline, and the composite antistatic auxiliary agent is formed by grafting acrylic acid on carbon nanofibers and then compounding the carbon nanofibers with graphene oxide.
The gas pipeline uses the composite antistatic auxiliary agent, firstly, the graphene oxide and the carbon nanofiber have better electric conductivity, and can lead out static charges generated in a matrix material in time, secondly, the carbon nanofiber is grafted by acrylic acid, on one hand, an acrylic acid molecular chain is introduced to the surface of the carbon nanofiber to form a brush-like structure, so that the reduction of the surface energy and the polarity of the carbon nanofiber is facilitated, and the compatibility with a polyethylene matrix material is increased, on the other hand, when the carbon nanofiber and the graphene oxide are compounded, the interlayer spacing of the graphene oxide can be increased through the intercalation effect of the acrylic acid, so that the agglomeration effect of the graphene oxide is reduced, meanwhile, the carbon nanofiber and the graphene oxide can be combined to form a network-like structure, so that the static charges are more favorably led out, meanwhile, the carbon nanofibers and the graphene oxide can be mutually constrained, and the dispersibility and stability of the composite antistatic auxiliary agent in the matrix material are further improved to a certain extent.
In addition, the graphene oxide and the carbon nanofibers used in the composite antistatic auxiliary agent can also play a role in reinforcing a matrix polyethylene material, and the composite antistatic auxiliary agent is more favorable for improving the mechanical property of the matrix material due to the increased compatibility, dispersibility and stability of the composite antistatic auxiliary agent and the matrix material.
Further, the fuel gas pipeline comprises the following raw materials in parts by weight: 60-80 parts of polyethylene, 15-22 parts of styrene maleic anhydride copolymer, 5-8 parts of ethylene bis-oleamide, 15-20 parts of composite antistatic auxiliary agent, 2-10 parts of flame retardant, 2-3 parts of polyethylene wax, 0.4-0.6 part of antioxidant and 1-2 parts of silane coupling agent.
Further, the fuel gas pipeline comprises the following raw materials in parts by weight: 70 parts of polyethylene, 18 parts of styrene maleic anhydride copolymer, 6 parts of ethylene bis-oleic acid amide, 16 parts of composite antistatic auxiliary agent, 6 parts of flame retardant, 3 parts of polyethylene wax, 0.5 part of antioxidant and 1 part of silane coupling agent.
Further, the flame retardant is one or more of aluminum hydroxide, magnesium hydroxide and expandable graphite.
Further, the antioxidant is any one of a phenol antioxidant, an amine antioxidant, a phosphite antioxidant or a thioester antioxidant.
In addition, the invention also discloses a preparation method of the high-strength polyethylene gas pipeline, which comprises the following steps:
s1: respectively weighing polyethylene, a styrene maleic anhydride copolymer, ethylene bis-oleamide, a composite antistatic additive, a flame retardant, polyethylene wax, an antioxidant and a silane coupling agent according to a ratio;
s2: adding the polyethylene and styrene maleic anhydride copolymer into a high-speed mixer, uniformly stirring, heating to 110-;
s3: placing the mixed material in a single-screw extruder, and extruding and molding under the conditions that the temperature of a material cylinder is 180-185 ℃, the temperature of a machine head is 220-225 ℃, the traction speed is 0.8-1.5m/min and the rotating speed of a main machine is 25-30r/min to obtain a finished product.
Further, the preparation method of the composite antistatic auxiliary agent comprises the following steps:
grafting: stirring and dissolving acrylic acid in deionized water, adjusting the pH value to 5-6 to obtain an acrylic acid solution, adding pretreated carbon nanofiber into the acrylic acid solution, performing ultrasonic dispersion, adding an initiator, performing heat preservation reaction at the temperature of 70-75 ℃ for 2-4h, filtering after the reaction is finished, adding a filter cake into absolute ethyl alcohol, performing immersion cleaning for 30min, then performing immersion cleaning for 3h with distilled water, and drying after the cleaning is finished to obtain acrylic acid grafted modified carbon nanofiber;
compounding: adding graphene oxide into deionized water, performing ultrasonic dispersion for 2 hours, adding methyl orange, performing ultrasonic treatment for 1 hour, adding ferric chloride, performing ultrasonic dispersion treatment for 30min, adding modified carbon nanofiber, performing heat preservation at 65-70 ℃, stirring for reaction for 1 hour, cooling to room temperature, standing at 1-4 ℃ for 10-12 hours, thawing, filtering, cleaning filter cakes with acetone, absolute ethyl alcohol and deionized water in sequence, and performing vacuum drying to obtain the composite antistatic auxiliary agent.
In the process of compounding with the graphene oxide, methyl orange and ferric chloride are used as templates, the interlayer spacing of the graphene oxide is firstly expanded, and the subsequent acrylic acid intercalation is facilitated.
Further, the pretreatment of the carbon nanofiber comprises the following steps: placing the carbon nano-fiber in a mixed acid solution, performing ultrasonic dispersion, heating to 110-120 ℃, performing heat preservation and reflux for 4-6h, naturally cooling to room temperature, performing suction filtration, washing a filter cake to be neutral by deionized water, and performing vacuum drying.
Further, the mixed acid solution is a mixed solution of concentrated nitric acid and concentrated sulfuric acid, and the volume ratio of the concentrated nitric acid to the concentrated sulfuric acid is 1: 3.
The carbon nanofiber subjected to mixed acid oxidation treatment has a large number of hydroxyl groups introduced on the surface, so that on one hand, subsequent acrylic acid grafting reaction is facilitated, and on the other hand, a continuous high-conductivity channel is facilitated to be formed by combining the structural characteristics of high length-diameter ratio, and the antistatic effect of the base material can be improved to a certain extent.
The invention has the beneficial effects that:
according to the high-strength polyethylene gas pipeline, the composite antistatic auxiliary agent is used in the raw materials, compared with the traditional antistatic agent, the compatibility with a matrix, the dispersity and the stability in the matrix are effectively improved, and the prepared gas pipeline not only has a good antistatic effect, but also has good mechanical properties.
Detailed Description
The present invention will be described in detail with reference to specific examples below:
example one
Preparation of composite antistatic auxiliary agent
Pretreatment: placing the carbon nanofibers in a mixed acid solution, wherein the mixed acid solution is prepared by mixing concentrated sulfuric acid and concentrated nitric acid according to the volume ratio of 3:1, heating to 120 ℃ after ultrasonic dispersion, carrying out heat preservation and reflux for 4-6h, preferably heating to 120 ℃, carrying out heat preservation and reflux for 5h, naturally cooling to room temperature, carrying out suction filtration, washing a filter cake to be neutral by deionized water, and carrying out vacuum drying at 80 ℃ to obtain the pretreated carbon nanofibers.
Grafting: stirring and dissolving acrylic acid in deionized water, adjusting the pH value to 5-6 to obtain an acrylic acid solution with the mass fraction of 65%, adding pretreated carbon nanofibers with the mass being 1/2 times that of the acrylic acid into the acrylic acid solution, performing ultrasonic dispersion, adding ammonium persulfate with the mass being 1.5% that of the acrylic acid, performing heat preservation reaction at the temperature of 75 ℃ for 4 hours, filtering after the reaction is finished, adding a filter cake into absolute ethyl alcohol for soaking and washing for 30 minutes, then soaking with distilled water for 3 hours, and drying after the washing is finished to obtain acrylic acid grafted modified carbon nanofibers;
compounding: adding graphene oxide into deionized water according to a solid-liquid ratio of 5g/L, adding methyl orange after ultrasonic dispersion for 2h, adding ferric chloride after ultrasonic treatment for 1h, adding modified carbon nanofiber with the mass of 2 times that of the graphene oxide after ultrasonic dispersion treatment for 30min, preserving heat at 70 ℃, stirring for reaction for 1h, cooling to room temperature, standing for 12h at 2 ℃, thawing, filtering, cleaning a filter cake with acetone, absolute ethyl alcohol and deionized water in sequence, and drying in vacuum to obtain the composite antistatic auxiliary agent.
Preparation of gas pipeline
S1: respectively weighing 70 parts of polyethylene, 18 parts of styrene maleic anhydride copolymer, 6 parts of ethylene bis-oleamide, 16 parts of composite antistatic auxiliary agent, 6 parts of flame retardant expandable graphite, 3 parts of polyethylene wax, 1680.5 part of antioxidant and 1 part of silane coupling agent according to the proportion;
s2: adding polyethylene and styrene maleic anhydride copolymer into a high-speed mixer, uniformly stirring, heating to 115 ℃, keeping the temperature for 30min, adding ethylene bis-oleic acid amide and a composite antistatic auxiliary agent, stirring and mixing at the rotating speed of 1100r/min for 40min, adding expandable graphite, polyethylene wax, an antioxidant 168 and a silane coupling agent, and uniformly stirring at the rotating speed of 1400r/min to obtain a mixed material;
s3: and (3) placing the mixed material into a single-screw extruder, and extruding and molding under the conditions that the temperature of a charging barrel is 185 ℃, the temperature of a machine head is 220 ℃, the traction speed is 1.5m/min, and the rotating speed of a main machine is 30r/min to obtain a finished product.
Example two
Preparation of composite antistatic auxiliary agent
The pretreatment was the same as in example one.
Grafting: stirring and dissolving acrylic acid in deionized water, adjusting the pH value to 5-6 to obtain an acrylic acid solution with the mass fraction of 65%, adding pretreated carbon nanofibers with the mass of 1/2 times that of the acrylic acid into the acrylic acid solution, performing ultrasonic dispersion, adding ammonium persulfate with the mass of 0.7% of the acrylic acid, performing heat preservation reaction at the temperature of 70 ℃ for 3 hours, filtering after the reaction is finished, adding a filter cake into absolute ethyl alcohol for soaking for 30 minutes, then soaking with distilled water for 3 hours, and drying after the cleaning is finished to obtain acrylic acid grafted modified carbon nanofibers;
compounding: adding graphene oxide into deionized water according to a solid-liquid ratio of 3g/L, adding methyl orange after ultrasonic dispersion for 2h, adding ferric chloride after ultrasonic treatment for 1h, adding modified carbon nanofiber with the mass of 2 times that of the graphene oxide after ultrasonic dispersion treatment for 30min, preserving heat at 65 ℃, stirring for reaction for 1h, cooling to room temperature, standing for 10h at 4 ℃, thawing, filtering, cleaning a filter cake with acetone, absolute ethyl alcohol and deionized water in sequence, and drying in vacuum to obtain the composite antistatic auxiliary agent.
Preparation of gas pipeline
S1: respectively weighing 60 parts of polyethylene, 22 parts of styrene maleic anhydride copolymer, 5 parts of ethylene bis-oleamide, 15 parts of composite antistatic auxiliary agent, 2 parts of flame retardant aluminum hydroxide, 2 parts of polyethylene wax, 10100.4 parts of antioxidant and 1 part of silane coupling agent according to the proportion;
s2: adding polyethylene and a styrene maleic anhydride copolymer into a high-speed mixer, uniformly stirring, heating to 120 ℃, keeping the temperature for 30min, adding ethylene bis-oleic acid amide and a composite antistatic auxiliary agent, stirring and mixing at the rotating speed of 1050r/min for 30min, adding aluminum hydroxide, polyethylene wax, an antioxidant 1010 and a silane coupling agent, and uniformly stirring at the rotating speed of 1300r/min to obtain a mixed material;
s3: and (3) placing the mixed material into a single-screw extruder, and extruding and molding under the conditions that the temperature of a charging barrel is 180 ℃, the temperature of a machine head is 220 ℃, the traction speed is 0.8m/min, and the rotating speed of a main machine is 25r/min to obtain a finished product.
EXAMPLE III
Preparation of composite antistatic auxiliary agent
The pretreatment was the same as in example one.
Grafting: stirring and dissolving acrylic acid in deionized water, adjusting the pH value to 5-6 to obtain an acrylic acid solution with the mass fraction of 65%, adding pretreated carbon nanofibers with the mass being 1/2 times that of the acrylic acid into the acrylic acid solution, performing ultrasonic dispersion, adding ammonium persulfate with the mass being 1% that of the acrylic acid, performing heat preservation reaction at the temperature of 75 ℃ for 2 hours, filtering after the reaction is finished, adding a filter cake into absolute ethyl alcohol for immersion cleaning for 30 minutes, then using distilled water for immersion cleaning for 3 hours, and drying after the cleaning is finished to obtain acrylic acid grafted modified carbon nanofibers;
compounding: adding graphene oxide into deionized water according to a solid-liquid ratio of 4g/L, adding methyl orange after ultrasonic dispersion for 2h, adding ferric chloride after ultrasonic treatment for 1h, adding modified carbon nanofiber with the mass of 3 times that of the graphene oxide after ultrasonic dispersion treatment for 30min, preserving heat at 65 ℃, stirring for reaction for 1h, cooling to room temperature, standing for 11h at 1 ℃, thawing, filtering, cleaning a filter cake with acetone, absolute ethyl alcohol and deionized water in sequence, and drying in vacuum to obtain the composite antistatic auxiliary agent.
Preparation of gas pipeline
S1: respectively weighing 80 parts of polyethylene, 15 parts of styrene maleic anhydride copolymer, 8 parts of ethylene bis-oleamide, 20 parts of composite antistatic auxiliary agent, 10 parts of flame retardant magnesium hydroxide, 3 parts of polyethylene wax, 10760.6 parts of antioxidant and 2 parts of silane coupling agent according to the proportion;
s2: adding polyethylene and styrene maleic anhydride copolymer into a high-speed mixer, uniformly stirring, heating to 110 ℃, preserving heat for 30min, adding ethylene bis-oleic acid amide and a composite antistatic auxiliary agent, stirring and mixing at the rotating speed of 1100r/min for 20min, adding magnesium hydroxide, polyethylene wax, an antioxidant 1076 and a silane coupling agent, and uniformly stirring at the rotating speed of 1200r/min to obtain a mixed material;
s3: and (3) placing the mixed material into a single-screw extruder, and extruding and molding under the conditions that the temperature of a charging barrel is 185 ℃, the temperature of a machine head is 225 ℃, the traction speed is 1m/min, and the rotating speed of a main machine is 28r/min to obtain a finished product.
The surface resistivity and the mechanical property of the pipes prepared in the first to third embodiments are tested, wherein the surface resistivity is detected according to GB/T1410-2006 test method for the volume resistivity and the surface resistivity of the solid insulating material, and the test results are shown in Table 1:
TABLE 1
| Item | Example one | Example two | EXAMPLE III |
| Surface resistivity/omega | 5.34×106 | 4.29×106 | 4.87×106 |
| Tensile strength/MPa | 32.4 | 29.8 | 31.7 |
| Elongation at break/% | 291 | 313 | 304 |
| Ring stiffness/KN/m2 | 26.7 | 24.3 | 25.6 |
As can be seen from the data in Table 1, the polyethylene gas pipe prepared by the invention has good antistatic property and also has strong mechanical property.
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 high-strength polyethylene gas pipeline is characterized in that a composite antistatic auxiliary agent is added into raw materials of the gas pipeline, and the composite antistatic auxiliary agent is formed by grafting acrylic acid on carbon nanofibers and then compounding the carbon nanofibers with graphene oxide.
2. The high-strength polyethylene gas pipeline according to claim 1, characterized in that the gas pipeline comprises the following raw materials in parts by weight: 60-80 parts of polyethylene, 15-22 parts of styrene maleic anhydride copolymer, 8 parts of ethylene bis-oleamide, 15-20 parts of composite antistatic auxiliary agent, 2-10 parts of flame retardant, 2-3 parts of polyethylene wax, 0.4-0.6 part of antioxidant and 1-2 parts of silane coupling agent.
3. The high-strength polyethylene gas pipeline according to claim 2, characterized by comprising the following raw materials in parts by weight: 70 parts of polyethylene, 18 parts of styrene maleic anhydride copolymer, 6 parts of ethylene bis-oleic acid amide, 16 parts of composite antistatic auxiliary agent, 6 parts of flame retardant, 3 parts of polyethylene wax, 0.5 part of antioxidant and 1 part of silane coupling agent.
4. The high-strength polyethylene gas pipeline according to claim 3, wherein the flame retardant is one or more of aluminum hydroxide, magnesium hydroxide and expandable graphite.
5. The high-strength polyethylene gas pipeline according to claim 4, wherein the antioxidant is any one of a phenol antioxidant, an amine antioxidant, a phosphite antioxidant or a thioester antioxidant.
6. The method for preparing a high-strength polyethylene gas pipeline according to any one of claims 1 to 5, wherein the preparation method specifically comprises the following steps:
s1: respectively weighing polyethylene, a styrene maleic anhydride copolymer, ethylene bis-oleamide, a composite antistatic additive, a flame retardant, polyethylene wax, an antioxidant and a silane coupling agent according to a ratio;
s2: adding the polyethylene and styrene maleic anhydride copolymer into a high-speed mixer, uniformly stirring, heating to 110-;
s3: placing the mixed material in a single-screw extruder, and extruding and molding under the conditions that the temperature of a material cylinder is 180-185 ℃, the temperature of a machine head is 220-225 ℃, the traction speed is 0.8-1.5m/min and the rotating speed of a main machine is 25-30r/min to obtain a finished product.
7. The preparation method of the high-strength polyethylene gas pipeline according to claim 6, wherein the preparation method of the composite antistatic auxiliary agent comprises the following steps:
grafting: stirring and dissolving acrylic acid in deionized water, adjusting the pH value to 5-6 to obtain an acrylic acid solution, adding pretreated carbon nanofiber into the acrylic acid solution, performing ultrasonic dispersion, adding an initiator, performing heat preservation reaction at the temperature of 70-75 ℃ for 2-4h, filtering after the reaction is finished, adding a filter cake into absolute ethyl alcohol, performing immersion cleaning for 30min, then performing immersion cleaning for 3h with distilled water, and drying after the cleaning is finished to obtain acrylic acid grafted modified carbon nanofiber;
compounding: adding graphene oxide into deionized water, performing ultrasonic dispersion for 2 hours, adding methyl orange, performing ultrasonic treatment for 1 hour, adding ferric chloride, performing ultrasonic dispersion treatment for 30min, adding modified carbon nanofiber, performing heat preservation at 65-70 ℃, stirring for reaction for 1 hour, cooling to room temperature, standing at 1-4 ℃ for 10-12 hours, thawing, filtering, cleaning filter cakes with acetone, absolute ethyl alcohol and deionized water in sequence, and performing vacuum drying to obtain the composite antistatic auxiliary agent.
8. The method for preparing a high-strength polyethylene gas pipeline according to claim 7, wherein the pretreatment of the carbon nanofibers is: placing the carbon nano-fiber in a mixed acid solution, performing ultrasonic dispersion, heating to 110-120 ℃, performing heat preservation and reflux for 4-6h, naturally cooling to room temperature, performing suction filtration, washing a filter cake to be neutral by deionized water, and performing vacuum drying.
9. The method for preparing a high-strength polyethylene gas pipeline according to claim 8, wherein the mixed acid solution is a mixed solution of concentrated nitric acid and concentrated sulfuric acid, and the volume ratio of the concentrated nitric acid to the concentrated sulfuric acid is 1: 3.
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Denomination of invention: A high-strength polyethylene gas pipeline and its preparation method Granted publication date: 20230530 Pledgee: Fuyang sub branch of Bank of Hangzhou Co.,Ltd. Pledgor: ZHEJIANG BANGDE PIPE INDUSTRY Co.,Ltd. Registration number: Y2024980010865 |