CN110105842B - Special drag-reducing and wax-preventing powder coating for crude oil conveying pipeline and application - Google Patents
Special drag-reducing and wax-preventing powder coating for crude oil conveying pipeline and application Download PDFInfo
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- CN110105842B CN110105842B CN201910326495.XA CN201910326495A CN110105842B CN 110105842 B CN110105842 B CN 110105842B CN 201910326495 A CN201910326495 A CN 201910326495A CN 110105842 B CN110105842 B CN 110105842B
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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
- 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
Abstract
The invention relates to a special drag-reducing wax-proofing powder coating for a crude oil conveying pipeline, which comprises the following components in parts by weight: 300 parts of bisphenol A epoxy resin 240-450 parts of self-made modified epoxy resin, 90-120 parts of phenolic modified curing agent, 1.7-2.5 parts of imidazole accelerator, 180 parts of pigment and filler and 20-28 parts of auxiliary agent. The coating formed by the powder coating has smooth surface and excellent hydrophobic and oleophobic properties, can greatly reduce the adhesion deposition of paraffin, colloid and the like in crude oil, reduce the crude oil conveying resistance, improve the conveying efficiency and reduce the energy consumption.
Description
Technical Field
The invention belongs to the technical field of coatings, and relates to a resistance-reducing wax-proofing powder coating, in particular to a special resistance-reducing wax-proofing powder coating for a crude oil conveying pipeline and application thereof.
Background
The crude oil in China is mostly 'three-high (high wax content, high condensation point and high viscosity)' crude oil, and after a crude oil conveying pipeline runs for a period of time, a mixture of sand and other impurities which are difficult to flow and have a certain thickness is deposited on the inner wall of the pipeline, and the mixture is called wax deposition. After the wax is deposited on the inner wall of the pipeline, the inner diameter of the pipeline is reduced, the friction resistance is increased, the conveying capacity is reduced, the crude oil conveying efficiency is greatly reduced, and the wax deposition layer needs to be periodically cleaned, so that a large amount of energy is wasted.
The powder coating is a powder coating with 100 percent of solid content, does not contain solvent and toxic volatile substances, and is an energy-saving, environment-friendly and excellent-performance coating. The formed coating is smooth and compact, has good adhesive force, impact strength and toughness, high corner coverage rate and excellent chemical corrosion resistance.
In order to relieve the problem of wax deposition on the inner wall of the crude oil conveying pipeline, the invention provides the special drag-reducing wax-proof powder coating for the crude oil conveying pipeline, and a coating formed by the powder coating has smooth surface and excellent hydrophobic and oleophobic properties, so that the adhesion deposition of paraffin, colloid and the like in crude oil can be greatly reduced, the crude oil conveying resistance is reduced, the conveying efficiency is improved, and the energy consumption is reduced.
Through searching, the following three patent publications related to the patent application of the invention are found:
1. a solvent-free natural gas pipeline drag reduction inner coating and a preparation method thereof (CN103254723B), relates to a solvent-free natural gas pipeline drag reduction inner coating and a preparation method thereof, and the solvent-free natural gas pipeline drag reduction inner coating is a two-component coating which comprises a component A and a component B, wherein the component A and the component B are used in a matching way according to the mass ratio of A to B being 3-4.5 to 1, the preparation method comprises the steps of ball-milling a pigment and a filler to be less than 40 mu m, carrying out modification treatment, drying the modified pigment and filler, drying for 2h at 120 ℃, and removing volatile impurities and physical crystallization moisture; putting other components into a reaction kettle according to the raw material proportion of the component A, mixing and stirring for more than 1h at constant temperature; detecting the coating according to various detection indexes, filtering and packaging to obtain a component A; adding the component B, mixing and stirring for use. The invention has the advantages that: the coating does not contain organic solvent, and avoids the pinhole defect caused by solvent volatilization of solvent-based paint. The fire hazard caused by solvent volatilization of the solvent-based coating is eliminated, the harm of the coating to the health of constructors is reduced, and the environment is more friendly.
2. A fluorinated epoxy oil and gas pipeline inner drag reduction coating (CN103031031A) and a preparation method thereof are disclosed. The surface of the coating has higher hydrophobic and oleophobic properties, and is used for the inner wall of an oil and gas pipeline, so that the coating not only can play a role in corrosion prevention, but also can play a role in reducing flow resistance.
3. A special sintering epoxy powder coating (CN102643595B) for hot roll coating of a large-diameter steel pipe relates to a special sintering epoxy powder coating for hot roll coating of a large-diameter steel pipe, and the components and parts by weight of the components of the formula are as follows: 400-450 parts of bisphenol A epoxy resin; 50-60 parts of phenolic aldehyde modified epoxy resin; 50-99 parts of curing agent and 0.5-1 part of catalyst; 50-100 parts of wear-resistant anti-drag filler; 190 portions of corrosion-resistant pigment and filler and 240 portions of corrosion-resistant pigment and filler; 30-50 parts of an auxiliary agent; the preparation method comprises the steps of adding the materials into a high-speed mixer, adding the materials into an extruder after dry mixing, melting, mixing, cooling and tabletting at the extrusion temperature of 80-90 ℃, crushing by a crusher, grading, sieving and packaging to obtain the finished product of the powder coating. The invention is a special sintered epoxy powder coating variety for hot rolling coating of a large-diameter steel pipe with excellent corrosion resistance, and the coating efficiency and the corrosion resistance are excellent after the detection of customers and related authority departments, and the coating can completely reach the indexes of imported like products, some indexes even exceed foreign products, the price is superior to the imported products, and the coating is deeply favored by the customers.
By contrast, patent publication CN103254723B is a two-component liquid coating, which is essentially different from a powder coating: the perfluoropolyether epoxy resin modifier disclosed in patent publication CN103031031A is essentially different from the heptadecafluorodecyltrimethoxysilane disclosed in the invention, and the modification process is also essentially different: the special fusion bonding epoxy powder coating for hot roll coating of the large-diameter steel pipe disclosed in patent publication CN102643595B does not disclose the functions of hydrophobic and oleophobic property, resistance reduction and wax prevention, and is essentially different from the patent.
Therefore, the present patent application is substantially different from the above patent publications by comparison of technical features.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides the special anti-drag wax-proof powder coating for the crude oil conveying pipeline and the application thereof.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a special drag-reducing wax-proof powder coating for a crude oil conveying pipeline comprises the following components in parts by weight:
furthermore, the bisphenol A type epoxy resin has an epoxy equivalent of 850-980 g/eq.
Moreover, the preparation method of the self-made modified epoxy resin comprises the following steps:
adding 25-40 parts by weight of isopropanol and 1.8-2.4 parts by weight of heptadecafluorodecyltrimethoxysilane into a container, uniformly stirring, adding 20-25 parts of molten silicon micropowder, ultrasonically oscillating for 5-10 minutes, heating to 50-60 ℃, stirring for 30 minutes, pouring into a reaction kettle, adding 55-58 parts by weight of E-51 type epoxy resin into the reaction kettle, heating to 82-83 ℃ while mechanically stirring, and distilling and recovering the isopropanol; after the isopropanol distillation is finished, continuously heating to 140 +/-2 ℃, adding 22-25 parts by weight of bisphenol A, adding 0.016-0.0.025 parts by weight of quaternary ammonium salt catalyst after the bisphenol A is completely molten, naturally heating to 190 ℃ after the reaction is finished and keeping for 2.5-3 hours, discharging, cooling and crushing the reaction product to obtain the self-made modified epoxy resin.
Furthermore, the epoxy equivalent of the homemade modified epoxy resin is 950-1100 g/eq.
Moreover, the fused silica micro powder is spherical, and the particle size range is 3000-5000 meshes.
The phenolic modified curing agent has a softening point of 85-95 ℃ and a hydroxyl value of 0.45-0.55mol/100 g.
Moreover, the pigment filler consists of precipitated barium and an inorganic pigment.
And the auxiliary agent is a mixture of a leveling agent, an anti-interference agent and a degassing agent.
The application of the special drag-reducing and wax-preventing powder coating for the crude oil conveying pipeline in the aspect of coating the inner wall of the crude oil conveying pipeline.
Moreover, a coating formed after the drag-reducing and wax-preventing powder coating is coated on the inner wall of the crude oil conveying pipeline has excellent oleophobic and hydrophobic properties, the crude oil conveying resistance can be obviously reduced, the wax precipitation phenomenon of the inner wall of the pipeline is reduced, the wax removal period is prolonged, and the crude oil conveying efficiency is improved.
The invention has the advantages and positive effects that:
1. the fused silica powder in the powder coating can obviously float upwards when forming a coating, so that the coating has excellent wear resistance and can resist the friction and impact of sand in crude oil.
2. The coating formed by the powder coating has excellent oleophobic and hydrophobic properties, can obviously reduce the wax precipitation phenomenon of the inner wall of a pipeline, greatly prolongs the wax removal period and improves the conveying efficiency of crude oil.
3. The coating formed by the powder coating is compact and smooth, can obviously reduce the crude oil conveying resistance and the energy consumption, and has very strong practical value.
4. The coating formed by the powder coating has good adhesive force, impact strength and toughness, and strong chemical corrosion resistance, and can effectively resist the corrosion of various chemicals in crude oil.
5. The self-made modified epoxy resin disclosed in the powder coating has the advantages of simple production process, no three-waste discharge, energy conservation and environmental protection.
Drawings
FIG. 1 is a scanning electron microscope image of the floating of the fused silica powder when the powder coating prepared by the invention forms a coating;
FIG. 2 is a comparative oleophobic representation of a powder coating formed from the invention.
Detailed Description
The following detailed description of the embodiments of the present invention is provided for the purpose of illustration and not limitation, and should not be construed as limiting the scope of the invention.
The raw materials used in the invention are conventional commercial products unless otherwise specified; the methods used in the present invention are conventional in the art unless otherwise specified.
Example 1
A special drag-reducing wax-proof powder coating for a crude oil conveying pipeline comprises the following components in parts by weight:
preferably, the bisphenol A type epoxy resin has an epoxy equivalent of 850-980 g/eq.
Preferably, the preparation method of the self-made modified epoxy resin comprises the following steps:
adding 30 parts by weight of isopropanol and 2.3 parts by weight of heptadecafluorodecyltrimethoxysilane into a container, uniformly stirring, adding 23 parts of molten silicon micropowder, ultrasonically oscillating for 5-10 minutes, heating to 50-60 ℃, stirring for 30 minutes, pouring into a reaction kettle, adding 57 parts by weight of E-51 type epoxy resin into the reaction kettle, heating to 82-83 ℃ while mechanically stirring, and distilling and recovering the isopropanol; after the isopropanol distillation is finished, continuously heating to 140 +/-2 ℃, adding 24 parts by weight of bisphenol A, adding 0.02 part by weight of quaternary ammonium salt catalyst after the bisphenol A is completely molten, naturally heating to 180-fold temperature and keeping for 3 hours, and then discharging, cooling and crushing the reaction product to obtain the self-made modified epoxy resin.
Preferably, the epoxy equivalent of the homemade modified epoxy resin is 950-1100 g/eq.
Preferably, the fused silica powder is spherical, and the particle size range is 3000-.
Preferably, the phenolic modified curing agent has a softening point of 85-95 ℃ and a hydroxyl value of 0.45-0.55mol/100 g.
Preferably, the pigment filler consists of precipitated barium and an inorganic pigment.
Preferably, the auxiliary agent is a mixture of a leveling agent, an anti-interference agent and a degassing agent.
The drag-reducing wax-proof powder coating is specially used for coating the inner wall of a crude oil conveying pipeline.
Preferably, a coating formed by the drag-reducing wax-proofing powder coating has excellent oleophobic and hydrophobic properties, can obviously reduce the crude oil conveying resistance, reduce the wax precipitation phenomenon on the inner wall of a pipeline, greatly prolong the wax removal period and improve the crude oil conveying efficiency.
Example 2
A special drag-reducing wax-proof powder coating for a crude oil conveying pipeline comprises the following components in parts by weight:
further, the bisphenol A type epoxy resin has an epoxy equivalent of 850-980 g/eq.
Further, the preparation method of the self-made modified epoxy resin comprises the following steps:
adding 25-40 parts by weight of isopropanol and 1.8-2.4 parts by weight of heptadecafluorodecyltrimethoxysilane into a container, uniformly stirring, adding 20-25 parts of molten silicon micropowder, ultrasonically oscillating for 5-10 minutes, heating to 50-60 ℃, stirring for 30 minutes, pouring into a reaction kettle, adding 55-58 parts by weight of E-51 type epoxy resin into the reaction kettle, heating to 82-83 ℃ while mechanically stirring, and distilling and recovering the isopropanol; after the isopropanol distillation is finished, continuously heating to 140 +/-2 ℃, adding 22-25 parts by weight of bisphenol A, adding 0.016-0.0.025 parts by weight of quaternary ammonium salt catalyst after the bisphenol A is completely molten, naturally heating to 190 ℃ after the reaction is finished and keeping for 2.5-3 hours, discharging, cooling and crushing the reaction product to obtain the self-made modified epoxy resin.
Further, the epoxy equivalent of the homemade modified epoxy resin is 950-1100 g/eq.
Further, the fused silica micro powder is spherical, and the particle size range is 3000-5000 meshes.
Furthermore, the phenolic modified curing agent has a softening point of 85-95 ℃ and a hydroxyl value of 0.45-0.55mol/100 g.
Further, the pigment filler is composed of precipitated barium and inorganic pigment.
Further, the auxiliary agent is a mixture of a leveling agent, an anti-interference agent and a degassing agent.
The special drag-reducing and wax-preventing powder coating for the crude oil conveying pipeline can be applied to the coating aspect of the inner wall of the crude oil conveying pipeline.
Furthermore, a coating formed after the drag-reducing and wax-proofing powder coating is coated on the inner wall of the crude oil conveying pipeline has excellent oleophobic and hydrophobic properties, the crude oil conveying resistance can be obviously reduced, the wax precipitation phenomenon of the inner wall of the pipeline is reduced, the wax removal period is prolonged, and the crude oil conveying efficiency is improved.
The correlation detection results of the invention are as follows:
the samples using the special drag-reducing and wax-proofing powder coating for crude oil transportation pipelines of the invention were tested according to GB/T18593-2010 with the results as follows:
| test items | The invention discloses an anticorrosive powder coating | Comparative experiment | |
| Impact resistance (-30 ℃ C.) | ≥1.5J | ≥1.5J | |
| Bending resistance (3o) | Without cracks | Without cracks | |
| Abrasion resistance (mg) | ≤100 | ≤100 | |
| | Level | 1 | |
| Cathode stripping (65 ℃, 48h) | ≤2 | 4 | |
| Boiling resistant (95 ℃, 24h) | No bubbling and no prying | Bubbling and not being pried | |
| Crude oil adhesion | Can be cleaned and has no trace | Has trace |
The scanning electron microscope test result of the floating of the fused silica micro powder when the powder coating prepared by the invention forms a coating is shown in figure 1, and the hydrophobic and oleophobic contrast ratio of the coating is shown in figure 2.
As shown in the results in the table, the drag-reducing and wax-preventing powder coating special for the crude oil conveying pipeline has excellent impact resistance, bending resistance, wear resistance, adhesion and cathodic disbanding resistance. Meanwhile, the powder coating has excellent boiling resistance, no foaming and peeling phenomena occur after boiling for 24 hours at 95 ℃, and the foaming phenomenon occurs in a contrast coating, which shows that the coating is damaged. As shown in figure 1, the fused silica powder in the powder coating floats obviously, so that the coating has excellent wear resistance. Furthermore, the powder coating coatings of the present invention have far superior anti-adhesion to crude oil than the comparative coatings. As shown in FIG. 2, after crude oil is adhered, the powder coating of the invention can be completely wiped clean without leaving any trace, and the comparative coating can not be completely wiped clean with obvious trace.
Although the embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that: various substitutions, changes and modifications are possible without departing from the spirit and scope of the invention and the appended claims, and therefore the scope of the invention is not limited to the disclosure of the embodiments and the accompanying drawings.
Claims (6)
1. A special drag-reducing wax-proof powder coating for a crude oil conveying pipeline is characterized in that: the components and parts by weight are as follows:
the epoxy equivalent of the bisphenol A type epoxy resin is 850-980 g/eq;
the preparation method of the self-made modified epoxy resin comprises the following steps:
adding 25-40 parts by weight of isopropanol and 1.8-2.4 parts by weight of heptadecafluorodecyltrimethoxysilane into a container, uniformly stirring, adding 20-25 parts of molten silicon micropowder, ultrasonically oscillating for 5-10 minutes, heating to 50-60 ℃, stirring for 30 minutes, pouring into a reaction kettle, adding 55-58 parts by weight of E-51 type epoxy resin into the reaction kettle, heating to 82-83 ℃ while mechanically stirring, and distilling and recovering the isopropanol; after the isopropanol distillation is finished, continuously heating to 140 +/-2 ℃, adding 22-25 parts by weight of bisphenol A, adding 0.016-0.0.025 parts by weight of quaternary ammonium salt catalyst after the bisphenol A is completely molten, naturally heating to 190 ℃ after the reaction is finished and keeping for 2.5-3 hours, discharging, cooling and crushing a reaction product to obtain the self-made modified epoxy resin;
the epoxy equivalent of the self-made modified epoxy resin is 950-1100 g/eq;
the softening point of the phenolic modified curing agent is 85-95 ℃, and the hydroxyl value is 0.45-0.55mol/100 g.
2. The method for preparing the homemade modified epoxy resin according to claim 1, which is characterized in that: the fused silica micro powder is spherical, and the particle size range is 3000-5000 meshes.
3. The drag-reducing wax-proofing powder coating special for crude oil conveying pipelines according to claim 1 or 2, characterized in that: the pigment filler consists of precipitated barium and inorganic pigment.
4. The drag-reducing wax-proofing powder coating special for crude oil conveying pipelines according to claim 1 or 2, characterized in that: the auxiliary agent is a mixture of a leveling agent, an anti-interference agent and a degassing agent.
5. The use of the drag-reducing and wax-proofing powder coating specially used for crude oil transportation pipelines as claimed in any one of claims 1 to 4 in the aspect of coating the inner wall of the crude oil transportation pipelines.
6. The application of the drag-reducing and wax-proofing powder coating specially used for the crude oil conveying pipeline in the aspect of coating the inner wall of the crude oil conveying pipeline, which is characterized in that: the coating formed after the drag-reducing wax-proof powder coating is coated on the inner wall of the crude oil conveying pipeline has excellent oleophobic and hydrophobic properties, can obviously reduce the crude oil conveying resistance, reduce the wax precipitation phenomenon of the inner wall of the pipeline, prolong the wax removal period and improve the conveying efficiency of the crude oil.
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| CN201910326495.XA CN110105842B (en) | 2019-04-23 | 2019-04-23 | Special drag-reducing and wax-preventing powder coating for crude oil conveying pipeline and application |
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| CN201910326495.XA CN110105842B (en) | 2019-04-23 | 2019-04-23 | Special drag-reducing and wax-preventing powder coating for crude oil conveying pipeline and application |
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| CN110105842B true CN110105842B (en) | 2021-08-31 |
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| CN112500608B (en) * | 2020-11-20 | 2022-03-15 | 江苏联瑞新材料股份有限公司 | Preparation method of fused silica micropowder for high-frequency high-speed copper-clad plate |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1733853A (en) * | 2005-06-01 | 2006-02-15 | 兰州理工大学 | FBE pnenolic aldehyde modified epoxy powder coating and its preparation method |
| CN102277065A (en) * | 2011-07-08 | 2011-12-14 | 上海邦中新材料有限公司 | Epoxy resin powder coating and preparation method thereof |
| CN103031031A (en) * | 2011-10-08 | 2013-04-10 | 江苏正菱涂装有限公司 | Drag reduction coating in fluorinated epoxy oil and gas pipeline |
| CN105925145A (en) * | 2016-07-07 | 2016-09-07 | 天津瑞远粉末涂料有限公司 | High-performance anti-corrosion epoxy powder coating |
-
2019
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1733853A (en) * | 2005-06-01 | 2006-02-15 | 兰州理工大学 | FBE pnenolic aldehyde modified epoxy powder coating and its preparation method |
| CN102277065A (en) * | 2011-07-08 | 2011-12-14 | 上海邦中新材料有限公司 | Epoxy resin powder coating and preparation method thereof |
| CN103031031A (en) * | 2011-10-08 | 2013-04-10 | 江苏正菱涂装有限公司 | Drag reduction coating in fluorinated epoxy oil and gas pipeline |
| CN105925145A (en) * | 2016-07-07 | 2016-09-07 | 天津瑞远粉末涂料有限公司 | High-performance anti-corrosion epoxy powder coating |
Non-Patent Citations (1)
| Title |
|---|
| 超细二氧化硅微粉增韧改性环氧树脂的研究;单书燕等;《胶体与聚合物》;20160331;第34卷(第1期);第7-9页 * |
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