CN116410662A - High-performance polyimide temperature-resistant coating and preparation method and application thereof - Google Patents
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- CN116410662A CN116410662A CN202111661630.XA CN202111661630A CN116410662A CN 116410662 A CN116410662 A CN 116410662A CN 202111661630 A CN202111661630 A CN 202111661630A CN 116410662 A CN116410662 A CN 116410662A
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- 238000000576 coating method Methods 0.000 title claims abstract description 65
- 229920001721 polyimide Polymers 0.000 title claims abstract description 63
- 239000004642 Polyimide Substances 0.000 title claims abstract description 61
- 239000011248 coating agent Substances 0.000 title claims abstract description 60
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- HYDATEKARGDBKU-UHFFFAOYSA-N 4-[4-[4-(4-aminophenoxy)phenyl]phenoxy]aniline Chemical group C1=CC(N)=CC=C1OC1=CC=C(C=2C=CC(OC=3C=CC(N)=CC=3)=CC=2)C=C1 HYDATEKARGDBKU-UHFFFAOYSA-N 0.000 claims abstract description 14
- VLDPXPPHXDGHEW-UHFFFAOYSA-N 1-chloro-2-dichlorophosphoryloxybenzene Chemical compound ClC1=CC=CC=C1OP(Cl)(Cl)=O VLDPXPPHXDGHEW-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000002904 solvent Substances 0.000 claims abstract description 11
- 239000000839 emulsion Substances 0.000 claims description 25
- 239000003795 chemical substances by application Substances 0.000 claims description 21
- 239000000843 powder Substances 0.000 claims description 18
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 claims description 10
- 229910052982 molybdenum disulfide Inorganic materials 0.000 claims description 10
- 239000013530 defoamer Substances 0.000 claims description 8
- 239000003208 petroleum Substances 0.000 claims description 8
- 239000000945 filler Substances 0.000 claims description 7
- 239000006097 ultraviolet radiation absorber Substances 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 claims description 5
- OKIZCWYLBDKLSU-UHFFFAOYSA-M N,N,N-Trimethylmethanaminium chloride Chemical compound [Cl-].C[N+](C)(C)C OKIZCWYLBDKLSU-UHFFFAOYSA-M 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 2
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 4
- 238000005507 spraying Methods 0.000 description 8
- 238000001035 drying Methods 0.000 description 6
- 239000002253 acid Substances 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- 239000002518 antifoaming agent Substances 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 3
- 239000011247 coating layer Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical group [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- -1 iron ions Chemical class 0.000 description 2
- 230000020477 pH reduction Effects 0.000 description 2
- 239000009719 polyimide resin Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 229920002396 Polyurea Polymers 0.000 description 1
- 229920002125 Sokalan® Polymers 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical group OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 description 1
- 238000007590 electrostatic spraying Methods 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000009775 high-speed stirring Methods 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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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
- C09D179/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen, with or without oxygen, or carbon only, not provided for in groups C09D161/00 - C09D177/00
- C09D179/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
- C09D179/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
-
- 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
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08G73/1003—Preparatory processes
- C08G73/1007—Preparatory processes from tetracarboxylic acids or derivatives and diamines
-
- 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
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08G73/1067—Wholly aromatic polyimides, i.e. having both tetracarboxylic and diamino moieties aromatically bound
- C08G73/1071—Wholly aromatic polyimides containing oxygen in the form of ether bonds in the main chain
-
- 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
- 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
- C09D5/18—Fireproof paints including high temperature resistant paints
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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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2150/00—Compositions for coatings
- C08G2150/90—Compositions for anticorrosive coatings
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- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3009—Sulfides
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Abstract
The invention discloses a high-performance polyimide temperature-resistant coating, a preparation method and application thereof, belonging to the technical field of coating materials, and comprising the following steps: s1, firstly, adding a solvent into a container, and then slowly adding 4,4 '-di (4-aminophenoxy) biphenyl until the 4,4' -di (4-aminophenoxy) biphenyl is fully dissolved; s2, adding pyromellitic dianhydride, and then reacting for 4-6 hours at the temperature of 0-6 ℃ to obtain a high-performance polyimide coating; the coating prepared by the invention has extremely high temperature resistance, the highest temperature reaches 488 ℃, and the temperature resistance of the coating is far superior to that of a conventional organic coating, and the cost performance is high.
Description
Technical Field
The invention belongs to the technical field of coating materials, and particularly relates to a high-performance polyimide temperature-resistant coating, and a preparation method and application thereof.
Background
In recent years, in order to increase the petroleum yield, deep wells and ultra-deep wells are continuously appeared, and the working temperature and pressure of petroleum pipelines and equipment are continuously increased. Higher temperatures, pressures present a greater challenge to the corrosion resistance of the pipeline. In addition, acidification is often used in the later period of oil and gas exploitation to improve the yield, and hydrochloric acid and earth acid are often used in the acidification construction. The injection of acid erodes the permeation pore canal to generate artificial cracks and dredge holes, but the injection of acid can cause corrosion of petroleum pipelines, can cause sudden fracture accidents of underground pipes, and simultaneously, metal iron ions eroded by the acid can also cause damage to stratum. Therefore, in order to prevent the corrosion of petroleum pipelines, the way of coating is a common anti-corrosion measure. The most commonly used coatings at present are mainly high molecular polyethylene, epoxy, polyacrylic acid and polyurea type coatings. These commonly used coatings have some drawbacks, such as resistance to temperatures typically not exceeding 200 degrees, and are difficult to use in high temperature environments; the mechanical property is not high, and the falling off is easy; inflammable and poor in static electricity conducting effect, and potential safety hazard is caused by spark generated by impact.
Disclosure of Invention
The invention aims to provide a high-performance polyimide temperature-resistant coating, a preparation method and application thereof, which solve the problem that the coating in the prior art is difficult to use in a high-temperature environment; the mechanical property is not high, and the falling off is easy; inflammable and poor in static electricity conducting effect, and is easy to generate sparks due to impact, thereby bringing about potential safety hazards and other technical problems.
The invention discloses a high-performance polyimide temperature-resistant coating, which comprises high-performance polyimide, wherein the high-performance polyimide has the following structure:
further, molybdenum disulfide is also included.
By using molybdenum disulfide, the coating strength can be improved while the temperature resistance is maintained, and the cost is reduced. The molybdenum disulfide powder may be directly mixed with the high performance polyimide powder.
Further, the adding amount of the molybdenum disulfide is 15-40% of the adding amount of the high-performance polyimide.
Further, the high-performance polyimide is a high-performance polyimide emulsion.
Further, the preparation method of the high-performance polyimide emulsion comprises the steps of mixing high-performance polyimide powder with the tetrafluoro emulsion to obtain mixed emulsion, adding tetramethyl ammonium chloride in an amount which is 20% -45% of the mixed emulsion, and dispersing the high-performance polyimide powder into the tetrafluoro emulsion to prepare the high-performance polyimide emulsion according to 0.5% -2% of the total amount of the high-performance polyimide powder and the tetrafluoro emulsion.
Further, the paint also comprises a filler, an ultraviolet absorber, a defoaming agent, aqueous yellow paste, a leveling agent, water and a curing agent.
Further, the addition amounts of the components in parts by weight are as follows: 30-50 parts of high-performance polyimide emulsion, 15-20 parts of filler, 2 parts of ultraviolet absorber, 1 part of defoamer, 5 parts of aqueous yellow paste, 2 parts of flatting agent, 20 parts of water and 10-15 parts of curing agent.
Further, the filler is molybdenum disulfide, the ultraviolet absorber is UV-326, the defoamer is a siloxane defoamer Tego anti-foam 793, the leveling agent is an organosilicon leveling agent HY5057, and the curing agent is an aliphatic amine curing agent DG593.
A preparation method of a high-performance polyimide temperature-resistant coating comprises the following steps:
s1, firstly, adding a solvent into a container, and then slowly adding 4,4 '-di (4-aminophenoxy) biphenyl until the 4,4' -di (4-aminophenoxy) biphenyl is fully dissolved;
s2, adding pyromellitic dianhydride, and then reacting for 4-6 hours at the temperature of 0-6 ℃ to obtain a high-performance polyimide coating;
the synthetic route is as follows:
further, the solvent is one or a mixture of more of N, N-dimethylacetamide, N-dimethylformamide and N-methylpyrrolidone.
Further, the molar ratio of the 4,4' -bis (4-aminophenoxy) biphenyl to the pyromellitic dianhydride is 1-1.2:1.
Further, the molar ratio of pyromellitic dianhydride to 4,4' -bis (4-aminophenoxy) biphenyl is 1:1.
The application of the high-performance polyimide temperature-resistant coating is used for petroleum pipelines and equipment.
Further, the coating is applied to the outer and inner surfaces of the pipe.
Further, the coating thickness of the coating is 100-200 μm.
Further, the coating thickness of the coating layer was 150. Mu.m.
Further, the coating is cured at normal temperature or at high temperature.
Further, the coating spraying mode is mechanical arm spraying.
The beneficial effects of the invention are as follows:
1. the coating prepared by the invention has extremely high temperature resistance, the highest temperature reaches 488 ℃, the temperature resistance of the far-reaching super-conventional organic coating is high, and the cost performance is high;
2. the spraying process is simple, and can be used for corrosion prevention of the outer surface of high-temperature equipment and pipelines.
Drawings
FIG. 1 is a chart showing the temperature resistance test of the coating according to example 1 of the present invention;
FIG. 2 is a graph showing the temperature resistance and acid resistance of the coating of example 1 of the present invention.
Detailed Description
In addition, the embodiments of the present invention and the features of the embodiments may be combined with each other without collision.
Example 1
An application of a high performance polyimide coating, comprising the steps of:
s1, firstly, 50mL of solvent N, N-dimethylacetamide is added into a three-necked flask, and then 4,4' -di (4-aminophenoxy) biphenyl is slowly added until the solvent is fully dissolved
S2, adding pyromellitic dianhydride, wherein the ratio of the 4,4' -di (4-aminophenoxy) biphenyl to the pyromellitic dianhydride is 1:1 and then reacting for 4 hours at 0 ℃ to obtain the high-performance polyimide coating.
S3, spraying the prepared coating on the surface of the P100 metal by adopting a mechanical arm spraying mode, and drying the coating by adopting a high-temperature curing mode to obtain the surface coating with the thickness of 130+/-15 mu m.
The prepared high-performance coating has very good temperature resistance, and the temperature resistance can reach 488 ℃ as shown in figure 1. The test results of the corrosion in 20% HCl at 160 ℃ for 4 hours are shown in FIG. 2, and the quality is not changed basically.
Example 2:
the application of the high-performance polyimide coating in petroleum pipelines comprises the following steps:
s1, firstly, adding 50mL of solvent N, N-dimethylacetamide into a three-necked flask, and then slowly adding 4,4' -bis (4-aminophenoxy) biphenyl until the solvent is fully dissolved;
s2, adding pyromellitic dianhydride, wherein the ratio of the 4,4' -di (4-aminophenoxy) biphenyl to the pyromellitic dianhydride is 1:1, and then reacting for 4 hours at the temperature of 0 ℃ to obtain the high-performance polyimide coating with the thickness of 162+/-25 mu m.
S3, the prepared coating is sprayed on the surface of the P100 metal in an electrostatic spraying mode, and then the coating is cured in a high-temperature (320 ℃) curing mode.
Example 3:
the high-temperature outer coating for the pipelines and the equipment comprises the following components in parts by weight:
45 parts of high-performance polyimide emulsion, 25 parts of filler, 2 parts of ultraviolet absorber, 1 part of defoamer, 5 parts of water-based yellow paste, 2 parts of flatting agent and 20 parts of water;
and the curing agent is used in combination with the components, and the dosage of the curing agent is 30% of that of the high-performance polyimide emulsion.
Wherein the filler is molybdenum disulfide, the ultraviolet absorber is UV-326, the defoamer is a siloxane defoamer Tego anti-foam 793, the leveling agent is an organosilicon leveling agent HY5057, and the curing agent is a fatty amine curing agent DG593.
The preparation method of the coating of the embodiment is as follows:
(1) Heating high-performance polyimide particles to 100-200 ℃ and drying for 4-10 hours, grinding into fine powder, and carrying out heat treatment for 2-5 hours at 220-260 ℃ under the protection of nitrogen to obtain high-performance fluorine polyimide powder;
(2) Mixing high-performance polyimide powder with a tetrafluoro emulsion according to a ratio of 1:2, adding tetramethyl ammonium chloride according to 1% of the total amount of the high-performance polyimide powder and the tetrafluoro emulsion, and dispersing the high-performance polyimide powder into the tetrafluoro emulsion to prepare the high-performance polyimide emulsion;
(3) Weighing the raw materials of all the components according to the required proportion;
(5) Sequentially adding water, high-performance polyimide emulsion, molybdenum disulfide, UV326, tego anti-foam 793, aqueous yellow slurry and a leveling agent HY5057 into a stirring tank under high-speed stirring, heating to 200 ℃, continuously stirring for 60 minutes, standing and cooling;
(6) The curing agent is added according to the proportion, and the mixture is stirred uniformly to obtain the coating with the high temperature resistant function, the coating is sprayed on the surface of the N80 steel pipe after surface treatment, the spraying thickness is controlled, and the coating with the thickness of 180+/-15 mu m is obtained after drying for 24 hours at 80 ℃.
Example 4:
the application of the high-performance polyimide coating in petroleum pipelines comprises the following steps:
s1, firstly, adding 50mL of solvent N, N-dimethylacetamide into a three-necked flask, and then slowly adding 4,4' -bis (4-aminophenoxy) biphenyl until the solvent is fully dissolved;
s2, adding pyromellitic dianhydride, wherein the ratio of the 4,4' -di (4-aminophenoxy) biphenyl to the pyromellitic dianhydride is 1.2:1, and then reacting for 4 hours at 0 ℃ to obtain the high-performance polyimide resin.
S3, drying and granulating the high-performance polyimide resin, grinding into powder of 200-400 microns, drying at 120 ℃ for 1 hour, and sealing, drying and storing.
S4, taking out the high-performance polyimide powder, adding 30% of molybdenum disulfide, and fully and uniformly mixing to obtain the high-performance polyimide powder coating.
S5, the prepared coating is solidified on the surface of the processed N80 steel pipe in a powder spraying mode and is solidified in a high-temperature (330 ℃) solidifying mode, and the thickness of the coating is adjusted through spraying time, so that the coating with the thickness of 150+/-25 mu m is prepared.
Comparative example 1:
substantially the same materials and preparation processes as in example 3 were used, except that the thickness of the coating layer was 380.+ -.15. Mu.m.
Comparative example 2:
substantially the same materials and preparation processes as in example 3 were used, except that the thickness of the coating layer was 80.+ -.15. Mu.m.
Coatings prepared in examples 1-4 and comparative examples 1-2 were tested after 30 days of standing at high temperature, and the properties of the tested coatings were tested according to the test methods provided by SY/T0457 and SY/T6717, with the results shown in the following Table:
as can be seen from the above table, the high-performance polyimide coating of the invention has outstanding high temperature resistance.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A high performance polyimide temperature resistant coating comprising a high performance polyimide having the structure:
2. the high performance polyimide temperature resistant coating of claim 1 further comprising molybdenum disulfide.
3. The high-performance polyimide temperature-resistant coating according to claim 2, wherein the molybdenum disulfide is added in an amount of 15-40% of the high-performance polyimide.
4. The high performance polyimide temperature resistant coating of claim 1 wherein the high performance polyimide is a high performance polyimide emulsion.
5. The high-performance polyimide temperature-resistant coating according to claim 4, wherein the preparation method of the high-performance polyimide emulsion is characterized in that the high-performance polyimide powder and the tetrafluoro emulsion are mixed to obtain a mixed emulsion, the addition amount of the high-performance polyimide powder is 20% -45% of the mixed emulsion, and then tetramethyl ammonium chloride is added according to 0.5% -2% of the total amount of the high-performance polyimide powder and the tetrafluoro emulsion, and then the high-performance polyimide powder is dispersed into the tetrafluoro emulsion to prepare the high-performance polyimide emulsion.
6. The high performance polyimide temperature resistant coating according to claim 5, further comprising a filler, an ultraviolet absorber, a defoamer, an aqueous yellow paste, a leveling agent, water and a curing agent.
7. The high-performance polyimide temperature-resistant coating according to claim 6, wherein the components are added in the following amounts in parts by weight: 30-50 parts of high-performance polyimide emulsion, 15-20 parts of filler, 2 parts of ultraviolet absorber, 1 part of defoamer, 5 parts of aqueous yellow paste, 2 parts of flatting agent, 20 parts of water and 10-15 parts of curing agent.
8. The method for preparing a high-performance polyimide temperature-resistant coating according to any one of claims 1 to 7, comprising the steps of:
s1, firstly, adding a solvent into a container, and then slowly adding 4,4 '-di (4-aminophenoxy) biphenyl until the 4,4' -di (4-aminophenoxy) biphenyl is fully dissolved;
s2, adding pyromellitic dianhydride, and then reacting for 4-6 hours at the temperature of 0-6 ℃ to obtain a high-performance polyimide coating;
the synthetic route is as follows:
9. the method for preparing the high-performance polyimide temperature-resistant coating according to claim 8, wherein the solvent is one or a mixture of more of N, N-dimethylacetamide, N-dimethylformamide and N-methylpyrrolidone.
10. Use of a high performance polyimide temperature resistant coating according to any one of claims 1 to 9 for petroleum pipelines and equipment.
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| CN202111661630.XA Pending CN116410662A (en) | 2021-12-30 | 2021-12-30 | High-performance polyimide temperature-resistant coating and preparation method and application thereof |
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Citations (4)
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|---|---|---|---|---|
| CN101139501A (en) * | 2007-10-11 | 2008-03-12 | 同济大学 | Polyimide thermostable aqueous dispersion coating material and preparation method and use thereof |
| CN103342678A (en) * | 2013-06-25 | 2013-10-09 | 四川大学 | Aromatic diamine containing triphenylpyridine and tertiary butyl, soluble polyimide prepared from aromatic diamine, and preparation method |
| CN110229609A (en) * | 2019-05-23 | 2019-09-13 | 东南大学 | A method of the polyimide paint with functional material and use the coating preparation functional form polyimide material |
| CN112048231A (en) * | 2020-09-18 | 2020-12-08 | 四川臻先科技股份有限公司 | Weather-resistant wear-resistant antifouling paint and preparation method thereof |
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2021
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| CN101139501A (en) * | 2007-10-11 | 2008-03-12 | 同济大学 | Polyimide thermostable aqueous dispersion coating material and preparation method and use thereof |
| CN103342678A (en) * | 2013-06-25 | 2013-10-09 | 四川大学 | Aromatic diamine containing triphenylpyridine and tertiary butyl, soluble polyimide prepared from aromatic diamine, and preparation method |
| CN110229609A (en) * | 2019-05-23 | 2019-09-13 | 东南大学 | A method of the polyimide paint with functional material and use the coating preparation functional form polyimide material |
| CN112048231A (en) * | 2020-09-18 | 2020-12-08 | 四川臻先科技股份有限公司 | Weather-resistant wear-resistant antifouling paint and preparation method thereof |
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