CN112812655A - Composition of high hydrogen sulfide resistance powder coating for oil pipe - Google Patents
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- CN112812655A CN112812655A CN202110008153.0A CN202110008153A CN112812655A CN 112812655 A CN112812655 A CN 112812655A CN 202110008153 A CN202110008153 A CN 202110008153A CN 112812655 A CN112812655 A CN 112812655A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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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
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
- C08G59/4007—Curing agents not provided for by the groups C08G59/42 - C08G59/66
- C08G59/4014—Nitrogen containing compounds
- C08G59/4021—Ureas; Thioureas; Guanidines; Dicyandiamides
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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
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
- C08G59/4007—Curing agents not provided for by the groups C08G59/42 - C08G59/66
- C08G59/4014—Nitrogen containing compounds
- C08G59/4035—Hydrazines; Hydrazides
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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
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
- C08G59/62—Alcohols or phenols
- C08G59/621—Phenols
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/03—Powdery paints
- C09D5/033—Powdery paints characterised by the additives
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/18—Applications used for pipes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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Abstract
The invention relates to the field of oil and gas exploitation, in particular to a composition of a high hydrogen sulfide resistance powder coating for an oil pipe, which comprises the following components in percentage by weight: 5-10% of bisphenol A epoxy resin, 3-10% of o-cresol epoxy, 20-30% of oxazolidone epoxy, 1-5% of aromatic hydrazide, 5-15% of phenolic aldehyde, 1-3% of thiourea, 1-3% of polyethylene wax, 0.1-2% of accelerator, 30-50% of filler and 0.5-1% of fumed silica. The invention also provides a preparation method of the coating composition. The powder prepared by the invention is cured at high temperature to prepare the high-hydrogen sulfide resistance powder coating for the oil pipe, is applied to drilling tools and pipelines for conveying crude oil to a treatment station on the ground, can protect the drilling tools and the steel pipe from being corroded by oil gas containing hydrogen sulfide, and can meet the requirement that the wear resistance is more than or equal to 2L/micron.
Description
Technical Field
The invention relates to the technical field of oil and gas exploitation, in particular to a composition of a high-hydrogen sulfide resistance powder coating for an oil pipe.
Background
In the process of oil and gas exploitation, hydrogen sulfide associated gas exists in crude oil products or natural gas, the downhole temperature of most of domestic oil fields is 80-110 ℃ under high-temperature and high-pressure conditions in the exploitation process, a high-performance coating is needed to prevent hydrogen sulfide from corroding drill pipes in mixed crude oil or natural oil, the hydrogen sulfide promotes corrosion and can cause hydrogen embrittlement of metal materials, once hydrogen embrittlement occurs, the metal materials have no rust and the toughness is obviously reduced, so that the working condition of high-torque and high-shear in the oil and gas exploitation process cannot be met, pipe bodies can be fractured, key oil wells are blocked, and fire and combustion of sulfur-containing oil and gas are caused to cause major accidents.
However, no report has been made on the composition of a high hydrogen sulfide resistance powder coating for oil pipes.
Disclosure of Invention
The invention aims to provide an anti-corrosion powder coating capable of resisting corrosion of hydrogen sulfide gas to a drilling tool in the oil well exploitation process, the coating can be applied to the drilling tool and the inner coating of a pipeline for conveying crude oil to a treatment station on the ground, and the drilling tool and a steel pipe can be protected from corrosion of oil gas containing hydrogen sulfide. By simulating the test conditions for oilfield development: 100 ℃/gas phase: 10MPa (15% hydrogen sulfide, 6% carbon dioxide, 79% CH)4) Solvent phase: mixed solvent (toluene 50%, kerosene 50%)/aqueous phase: 5% NaCl solution, the powder coating of the invention can meet the anti-corrosion requirement when crude oil contains hydrogen sulfide.
The invention provides a composition of a high hydrogen sulfide resistance powder coating for an oil pipe, which comprises the following components in percentage by weight:
furthermore, the bisphenol A epoxy resin has an epoxy equivalent of 400-550 and a softening point of 60-85 ℃. South Asia NPES 901 resins may be used.
Further, the softening point of the o-cresol epoxy resin is 85-105 ℃. Specifically, the resin may be south Asia 704 resin, or epoxy resin products of national institute of chemistry and Dow chemical.
Further, the epoxy equivalent of the oxazolidinone epoxy is 380-460. DER 6508 or 6510 resins of Dow chemistry may be used.
Furthermore, the aromatic hydrazide adopts phthalic dihydrazide or terephthalic dihydrazide.
Furthermore, the phenolic aldehyde adopts thermoplastic phenolic aldehyde, and the softening point is 85-110 ℃. Such as Shandong Shengquan PF-8013/8012/8010/8020
Further, the thiourea is selected from thiourea containing thiourea structure, amido thiourea, vinyl thiourea and the like.
Furthermore, the accelerant is an imidazole accelerant selected from imidazole, 2-methylimidazole, phenylimidazole and the like.
Furthermore, the filler is acid-resistant and wear-resistant and contains water less than or equal to 0.5 percent, such as ceramic powder, silicon powder, barium sulfate and the like. Preferably 800-mesh ceramic powder and 600-mesh silicon powder, which can be purchased from Alibab.
Further, the fumed silica is hydrophilic fumed silica. Degussa a200, wacker chemical N20, etc. may be used.
The materials used in the present invention are all commercially available materials.
According to the invention, the effect of improving the adhesive force and resisting hydrogen sulfide can be achieved by adopting the combination of the epoxy resin, the phenolic aldehyde, the hydrazide and the thiourea, the surface wear-resistant effect is achieved by introducing the polyethylene wax, and the polyethylene molecular chain can form free radicals during the curing at the high temperature of 210-230 ℃, and the free radicals tend to be coupled, so that the molecular weight of the polyethylene wax is increased, the more obvious wear-resistant performance is embodied, and the working condition of sand carried by crude oil in the using process of the oil pipe is met.
The powder coating is melted when being sprayed on the inner surface of a steel pipe in the first stage, and the phenolic aldehyde and the thiourea react with the epoxy resin together in the melting process, so that the high adhesion to a metal base material is achieved, meanwhile, the polyethylene wax is melted and migrates to the surface, and contacts oxygen in a curing furnace to form polyethylene free radicals, and through the coupling reaction among the polyethylene free radicals, the molecular weight increase of polyethylene is realized, and the wear resistance is improved.
In a second aspect of the present invention, there is provided a method for preparing the composition of the high hydrogen sulfide resistance powder coating for oil pipes, comprising the following steps:
and (2) performing melt extrusion on bisphenol A epoxy resin, o-cresol epoxy, oxazolidone epoxy, aromatic hydrazide, phenolic aldehyde, thiourea and polyethylene wax at 150 ℃ by using a screw extruder, tabletting and crushing to obtain an intermediate, then mixing and melting the intermediate, an accelerator and a filler, performing melt extrusion at 120 ℃, tabletting and crushing, and then adding fumed silica in the milling process to obtain the composition of the high hydrogen sulfide resistance powder coating for the oil pipe.
The production process realizes uniform dispersion through the pre-extrusion of the resin and the curing agent at 130-.
The invention has the advantages that:
1. the powder prepared by the invention is preheated to 190 ℃ through a high-temperature curing steel pipe, then the powder is subjected to vacuum adsorption, and then the powder enters a curing furnace for curing at 230 ℃/90min to prepare the high-hydrogen sulfide resistance powder coating for the oil pipe, the coating can be applied to a drilling tool and a pipeline for conveying crude oil to a treatment station on the ground for coating, and the drilling tool and the steel pipe can be protected from being corroded by oil gas containing hydrogen sulfide;
2. the invention simulates the test conditions of oil field exploitation: 107 ℃/gas phase: 10Mpa (15% hydrogen sulfide, 6% carbon dioxide, 79% CH 4)/solvent phase: mixed solvent (toluene 50%, kerosene 50%)/aqueous phase: 5% NaCl solution, the coating of the invention can meet the corrosion requirement of hydrogen sulfide in most oil pipe service working conditions, and can meet the requirement that the wear resistance is more than or equal to 2L/micron.
3. The invention solves the working condition that the crude oil of the oil pipe contains hydrogen sulfide, water, gravel and other media in the process of petroleum exploitation, and solves the problems of hydrogen sulfide corrosion and abrasion of the gravel to the coating. The high adhesive force is realized through the reaction of the phenolic aldehyde, the thiourea and the epoxy, and meanwhile, the wear resistance is improved by using the polyethylene wax powder. Therefore, the temperature is controlled at 110-120 ℃ in the extrusion process to achieve uniform mixing and reduce pre-reaction; the curing process is 190-.
Detailed Description
The following examples are provided to illustrate specific embodiments of the present invention.
Example 1:
TABLE 1 EXAMPLE 1 powder coating formulation
The preparation method comprises the following steps: a, B, C, D, E, F, G is melt-extruded at 140 ℃ by a screw extruder, an intermediate is obtained after tabletting and crushing, then the intermediate and H, I are mixed and melted, the mixture is melt-extruded at 120 ℃, the tabletting and crushing are carried out, and J is added in the milling process, thus obtaining the composition of the high hydrogen sulfide resistance powder coating for the oil pipe.
The prepared powder coating TG 2110 ℃, the gelling time is 70S, the steel pipe is preheated to 160-: 107 ℃/gas phase: 10MPa (15% hydrogen sulfide, 6% carbon dioxide, 79% CH)4) Solvent phase: mixed solvent (toluene 50%, kerosene 50%)/aqueous phase: 5% NaCl solution, the sample adhesion after 24h test reaches 5A grade, the high temperature and high pressure resistance performance exceeds the high temperature and high pressure test requirement in SY/T6717 (2016) standard, and the wear resistance reaches 2.1L/micron.
Example 2:
TABLE 2 example 2 powder coating formulation
The preparation method comprises the following steps: a, B, C, D, E, F, G is melt-extruded at 140 ℃ by a screw extruder, an intermediate is obtained after tabletting and crushing, then the intermediate and H, I are mixed and melted, the mixture is melt-extruded at 120 ℃, the tabletting and crushing are carried out, and J is added in the milling process, thus obtaining the composition of the high hydrogen sulfide resistance powder coating for the oil pipe.
The prepared powder coating TG 2120 ℃ is carried out, the gelling time is 65S, the steel pipe is preheated to 190 ℃ and is internally coated with the powder coating through vacuum adsorption, and then the temperature is 210 ℃/90min, so that the obtained coating can pass the test of a simulation working condition: 107 ℃/gas phase: 10Mpa (15% hydrogen sulfide, 6% carbon dioxide, 79% CH 4)/solvent phase: mixed solvent (toluene 50%, kerosene 50%)/aqueous phase: 5% NaCl solution, the sample adhesion after 24h test reaches 5A grade, the high temperature and high pressure resistance performance exceeds the high temperature and high pressure test requirement in SY/T6717 (2016) standard, and the wear resistance reaches 2.3L/micron.
Example 3:
TABLE 3 example 3 powder coating formulation
The preparation method comprises the following steps: a, B, C, D, E, F, G is melt-extruded at 140 ℃ by a screw extruder, an intermediate is obtained after tabletting and crushing, then the intermediate and H, I are mixed and melted, the mixture is melt-extruded at 120 ℃, the tabletting and crushing are carried out, and J is added in the milling process, thus obtaining the composition of the high hydrogen sulfide resistance powder coating for the oil pipe.
The prepared powder coating TG 2125 ℃ and the gelling time of 80S, the steel pipe is preheated to 190 ℃ and is internally coated with the powder coating through vacuum adsorption, and then the temperature is 220 ℃/90min, and the obtained coating can pass the test of a simulation working condition: 107 ℃/gas phase: 10MPa (15% hydrogen sulfide, 6% carbon dioxide, 79% CH)4) Solvent phase: mixed solvent (toluene 50%, kerosene 50%)/aqueous phase: 5% NaCl solution, the sample adhesion after 24h test reaches 5A grade, the high temperature and high pressure resistance performance exceeds the high temperature and high pressure test requirement in SY/T6717 (2016) standard, and the wear resistance reaches 2.5L/micron.
Example 4:
TABLE 4 example 4 powder coating formulation
The preparation method comprises the following steps: a, B, C, D, E, F, G is melt-extruded at 140 ℃ by a screw extruder, an intermediate is obtained after tabletting and crushing, then the intermediate and H, I are mixed and melted, the mixture is melt-extruded at 120 ℃, the tabletting and crushing are carried out, and J is added in the milling process, thus obtaining the composition of the high hydrogen sulfide resistance powder coating for the oil pipe.
The prepared powder coating TG 2115 ℃ and the gelling time of 90S, the steel pipe is preheated to 190 ℃ and is internally coated with the powder coating through vacuum adsorption, and then the temperature is 230 ℃/90min, and the obtained coating can pass the test of a simulation working condition: 107 ℃/gas phase: 10MPa (15% hydrogen sulfide, 6% carbon dioxide, 79% CH)4) Solvent phase: mixed solvent (toluene 50%, kerosene 50%)/aqueous phase: 5% NaCl solution, the sample adhesion after 24h test reaches 5A grade, the high temperature and high pressure resistance performance exceeds the high temperature and high pressure test requirement in SY/T6717 (2016) standard, and the wear resistance reaches 2.0L/micron.
Example 5:
TABLE 5 example 5 powder coating formulation
The preparation method comprises the following steps: a, B, C, D, E, F, G is melt-extruded at 140 ℃ by a screw extruder, an intermediate is obtained after tabletting and crushing, then the intermediate and H, I are mixed and melted, the mixture is melt-extruded at 120 ℃, the tabletting and crushing are carried out, and J is added in the milling process, thus obtaining the composition of the high hydrogen sulfide resistance powder coating for the oil pipe.
The prepared powder coating TG 2115 ℃ and the gelling time of 90S, the steel pipe is preheated to 190 ℃ and is internally coated with the powder coating through vacuum adsorption, and then the temperature is 230 ℃/90min, and the obtained coating can pass the test of a simulation working condition: 107 ℃/gas phase: 10MPa (15% hydrogen sulfide, 6% carbon dioxide, 79% CH)4) Solvent phase: mixed solvent (toluene 50%, kerosene 50%)/aqueous phase: 5% NaCl solution, the sample adhesion after 24h test reaches 5A grade, the high temperature and high pressure resistance performance exceeds the high temperature and high pressure test requirement in SY/T6717 (2016) standard, and the wear resistance reaches 2.1L/micron.
Example 6:
TABLE 6 example 6 powder coating formulation
The preparation method comprises the following steps: a, B, C, D, E, F, G is melt-extruded at 140 ℃ by a screw extruder, an intermediate is obtained after tabletting and crushing, then the intermediate and H, I are mixed and melted, the mixture is melt-extruded at 120 ℃, the tabletting and crushing are carried out, and J is added in the milling process, thus obtaining the composition of the high hydrogen sulfide resistance powder coating for the oil pipe.
The prepared powder coating TG 2125 ℃ and the gelling time is 110S, the steel pipe is preheated to 190 ℃ and is internally coated with the powder coating through vacuum adsorption, and then the temperature is 230 ℃/90min, and the obtained coating can pass the test of a simulation working condition: 107 ℃/gas phase: 10MPa (15% hydrogen sulfide, 6% carbon dioxide, 79% CH)4) Solvent phase: mixed solvent (toluene 50%, kerosene 50%)/aqueous phase: 5% NaCl solution, the sample adhesion after 24h test reaches 5A grade, the high temperature and high pressure resistance performance exceeds the high temperature and high pressure test requirement in SY/T6717 (2016) standard, and the wear resistance reaches 2.8L/micron.
Example 7:
TABLE 7 EXAMPLE 7 powder coating formulation
The preparation method comprises the following steps: a, B, C, D, E, F, G is melt-extruded at 140 ℃ by a screw extruder, an intermediate is obtained after tabletting and crushing, then the intermediate and H, I are mixed and melted, the mixture is melt-extruded at 120 ℃, the tabletting and crushing are carried out, and J is added in the milling process, thus obtaining the composition of the high hydrogen sulfide resistance powder coating for the oil pipe.
The prepared powder coating TG 2125 ℃ is subjected to gelation time of 105S, the steel pipe is preheated to 190 ℃ at 160 ℃, the powder coating is coated in a vacuum adsorption mode, then the temperature is 230 ℃/90min, and the obtained coating can pass the test of a simulation working condition: 107 ℃/gas phase: 10MPa (15% hydrogen sulfide, 6% carbon dioxide, 79% CH)4) Solvent phase: mixed solvent (toluene 50%, kerosene 50%)/aqueous phase: 5% NaCl solution, the sample adhesion after 24h test reaches 5A grade, the high temperature and high pressure resistance performance exceeds the high temperature and high pressure test requirement in SY/T6717 (2016) standard, and the wear resistance reaches 2.8L/micron.
While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the invention is not limited thereto, and that various changes and modifications may be made without departing from the spirit of the invention, and the scope of the appended claims is to be accorded the full range of equivalents.
Claims (10)
1. The composition of the high hydrogen sulfide resistance powder coating for the oil pipe is characterized by comprising the following components in percentage by weight:
2. the composition of powder coating with high hydrogen sulfide resistance for oil pipe as claimed in claim 1, wherein the bisphenol A epoxy resin has an epoxy equivalent of 400-550 and a softening point of 60-85 ℃.
3. The composition of the high hydrogen sulfide resistance powder coating for the oil pipe according to claim 1, wherein the softening point of the o-cresol epoxy is 85-105 ℃; the epoxy equivalent of the oxazolidinone epoxy is 380-460.
4. The composition of high hydrogen sulfide resistance powder coating for oil pipe according to claim 1, wherein the aromatic hydrazide is phthalic dihydrazide or terephthalic dihydrazide.
5. The composition of the high hydrogen sulfide resistance powder coating for the oil pipe according to claim 1, wherein the phenolic aldehyde is thermoplastic phenolic aldehyde, and the softening point is 85-110 ℃.
6. The composition of high hydrogen sulfide resistance powder coating for oil pipe according to claim 1, wherein the thiourea is selected from thiourea containing thiourea structure, amino thiourea and vinyl thiourea.
7. The composition of the high hydrogen sulfide resistance powder coating for the oil pipe as claimed in claim 1, wherein the accelerator is an imidazole accelerator selected from imidazole, 2-methylimidazole and phenylimidazole.
8. The composition of the high hydrogen sulfide resistance powder coating for the oil pipe according to claim 1, wherein the filler is selected from ceramic powder, silica micropowder and barium sulfate.
9. The composition of high hydrogen sulfide resistance powder coating for oil pipe according to claim 1, wherein the fumed silica is hydrophilic fumed silica.
10. A method for preparing a composition of the high hydrogen sulfide resistance powder coating for oil pipes according to any one of claims 1 to 9, comprising the steps of:
and (2) performing melt extrusion on bisphenol A epoxy resin, o-cresol epoxy, oxazolidone epoxy, aromatic hydrazide, phenolic aldehyde, thiourea and polyethylene wax at 150 ℃ by using a screw extruder, tabletting and crushing to obtain an intermediate, then mixing and melting the intermediate, an accelerator and a filler, performing melt extrusion at 120 ℃, tabletting and crushing, and then adding fumed silica in the milling process to obtain the composition of the high hydrogen sulfide resistance powder coating for the oil pipe.
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