CN109825185B - High-temperature-resistant anticorrosive coating and preparation method thereof - Google Patents
High-temperature-resistant anticorrosive coating and preparation method thereof Download PDFInfo
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- 238000000576 coating method Methods 0.000 title claims abstract description 72
- 239000011248 coating agent Substances 0.000 title claims abstract description 70
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 239000004642 Polyimide Substances 0.000 claims abstract description 122
- 229920001721 polyimide Polymers 0.000 claims abstract description 122
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 68
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims abstract description 57
- 229910052731 fluorine Inorganic materials 0.000 claims abstract description 57
- 239000011737 fluorine Substances 0.000 claims abstract description 57
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 53
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 53
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- 239000000377 silicon dioxide Substances 0.000 claims abstract description 34
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 31
- 238000000034 method Methods 0.000 claims abstract description 23
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- 230000015572 biosynthetic process Effects 0.000 claims description 16
- 238000003786 synthesis reaction Methods 0.000 claims description 16
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 14
- -1 hexafluoro dianhydride Chemical compound 0.000 claims description 14
- 238000006243 chemical reaction Methods 0.000 claims description 13
- 239000000843 powder Substances 0.000 claims description 13
- HLBLWEWZXPIGSM-UHFFFAOYSA-N 4-Aminophenyl ether Chemical compound C1=CC(N)=CC=C1OC1=CC=C(N)C=C1 HLBLWEWZXPIGSM-UHFFFAOYSA-N 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 12
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- GTDPSWPPOUPBNX-UHFFFAOYSA-N ac1mqpva Chemical compound CC12C(=O)OC(=O)C1(C)C1(C)C2(C)C(=O)OC1=O GTDPSWPPOUPBNX-UHFFFAOYSA-N 0.000 claims description 9
- 150000004985 diamines Chemical class 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 9
- 238000005507 spraying Methods 0.000 claims description 9
- LTYMSROWYAPPGB-UHFFFAOYSA-N diphenyl sulfide Chemical compound C=1C=CC=CC=1SC1=CC=CC=C1 LTYMSROWYAPPGB-UHFFFAOYSA-N 0.000 claims description 8
- NKNIZOPLGAJLRV-UHFFFAOYSA-N 2,2-diphenylpropane-1,1-diamine Chemical compound C=1C=CC=CC=1C(C(N)N)(C)C1=CC=CC=C1 NKNIZOPLGAJLRV-UHFFFAOYSA-N 0.000 claims description 7
- NTNWKDHZTDQSST-UHFFFAOYSA-N naphthalene-1,2-diamine Chemical compound C1=CC=CC2=C(N)C(N)=CC=C21 NTNWKDHZTDQSST-UHFFFAOYSA-N 0.000 claims description 7
- 230000002194 synthesizing effect Effects 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 6
- 238000007590 electrostatic spraying Methods 0.000 claims description 6
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
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Abstract
The invention discloses a high-temperature-resistant anticorrosive coating and a preparation method thereof, and belongs to the technical field of anticorrosive materials. The invention comprises the following steps: according to the mass percentage, the fluorine-containing polyimide accounts for 2 percent to 15 percent, the sulfur-containing polyimide accounts for 50 percent to 88 percent and the superfine silicon dioxide accounts for 10 percent to 35 percent. The high-temperature-resistant anticorrosive coating provided by the invention has the properties of self-lubrication, high temperature resistance and corrosion resistance, and the preparation method is simple, easy to operate, low in cost, simple in components of the wear-resistant material, easy to process and beneficial to popularization.
Description
Technical Field
The invention relates to the technical field of anticorrosive materials, in particular to a high-temperature-resistant anticorrosive coating and a preparation method thereof.
Background
With the innovation of the technology, special working conditions are more and more, and in the fields of petrochemical industry, aerospace, metallurgical power and the like, parts of some equipment can be subjected to accelerated corrosion under the combined action of corrosion and high temperature. The application of corrosion resistant coatings is one of the most effective solutions to the corrosion problem at present.
However, under high temperature conditions, it is necessary to use a high temperature resistant anticorrosive coating, wherein a wider range of ceramic coatings and silicone coatings are used, but the adhesion is poor, the mechanical strength is low, the coating is easy to crack and the coating is H-resistant2S performance is poor.
Disclosure of Invention
The invention aims to provide a high-temperature-resistant anticorrosive coating and a preparation method thereof, and aims to solve the problems of poor adhesion, low mechanical strength, easy cracking and H resistance of the conventional high-temperature-resistant anticorrosive coating2The S performance is poor.
The technical scheme for solving the technical problems is as follows:
a high temperature resistant corrosion protective coating comprising: according to the mass percentage, the fluorine-containing polyimide accounts for 2 percent to 15 percent, the sulfur-containing polyimide accounts for 50 percent to 88 percent and the superfine silicon dioxide accounts for 10 percent to 35 percent.
The coating is prepared by taking the fluorine-containing polyimide, the sulfur-containing polyimide and the superfine silicon dioxide as raw materials, and the coating has strong binding capacity and high adhesive force among the fluorine-containing polyimide, the sulfur-containing polyimide and the superfine silicon dioxide, and simultaneously has excellent mechanical strength, ensures the stability of the coating and has strong corrosion resistance. The high-temperature-resistant anticorrosive coating disclosed by the invention takes the sulfur-containing polyimide as a main raw material, utilizes the excellent high-temperature-resistant and corrosion-resistant properties of the sulfur-containing polyimide, and simultaneously adds the fluorine-containing polyimide as an auxiliary to improve the thermal stability of the coating and change the wettability of the surface of the coating, so that the wax crystal precipitation and adhesion on the surface of a base material are delayed, and the binding capacity of the coating and the surface of the base material is improved. In addition, the wear resistance and hardness of the coating are increased by adding the superfine silicon dioxide, the product quality is improved, and the service life is prolonged.
Further, in a preferred embodiment of the present invention, the high temperature resistant anticorrosive coating comprises: according to the mass percentage, the fluorine-containing polyimide accounts for 5 to 15 percent, the sulfur-containing polyimide accounts for 60 to 80 percent, and the superfine silicon dioxide accounts for 15 to 30 percent.
Further, in a preferred embodiment of the present invention, the high temperature resistant anticorrosive coating comprises: according to the mass percentage, the fluorine-containing polyimide accounts for 8 percent to 10 percent, the sulfur-containing polyimide accounts for 70 percent to 75 percent and the superfine silicon dioxide accounts for 15 percent to 20 percent.
Further, in the preferred embodiment of the invention, the fluorine-containing polyimide is prepared by synthesizing hexafluoro dianhydride and diamine in an organic solvent; the sulfur-containing polyimide is prepared by synthesizing 4, 4' -bis (3, 4-dicarboxyphenylthio) diphenyl sulfide dianhydride and diamine in an organic solvent; wherein the organic solvent is one or a mixture of N, N-dimethylacetamide, N-dimethylformamide and N-methylpyrrolidone.
Further, in a preferred embodiment of the present invention, the diamine for synthesizing the fluorine-containing polyimide includes 4, 4' -diaminodiphenyl ether and/or diaminodiphenylpropane; diamines for the synthesis of sulfur-containing polyimides include 4, 4' -diaminodiphenyl ether and/or diaminonaphthalene.
Further, in the preferred embodiment of the present invention, the synthesis temperature of the fluorine-containing polyimide and the synthesis temperature of the sulfur-containing polyimide are respectively 40 ℃ to 60 ℃, and the reaction time is respectively 5 to 6 hours.
Furthermore, in the preferred embodiment of the present invention, the particle size of the fluorine-containing polyimide is 10 to 50 μm, the particle size of the sulfur-containing polyimide is 10 to 50 μm, and the particle size of the ultra-fine silica is less than or equal to 5 μm.
According to the invention, through controlling the particle sizes of the fluorine-containing polyimide, the sulfur-containing polyimide and the superfine silicon dioxide, materials can be in full contact, the bonding capability between powder bodies is improved, the stability of the coating is further ensured, meanwhile, the manufacturing cost of the three raw materials in the range is not too high, and the dual requirements of performance and cost are considered.
According to the preparation method of the high-temperature-resistant anticorrosive coating, the fluorine-containing polyimide, the sulfur-containing polyimide and the superfine silicon dioxide are mixed and uniformly dispersed, the obtained material powder is sprayed on the surface of the base material, and then the high-temperature-resistant anticorrosive coating is obtained after solidification.
Further, in the preferred embodiment of the present invention, the curing temperature is 300-.
Further, in a preferred embodiment of the present invention, the preparation method comprises the following steps:
(1) synthesis of fluorine-containing polyimide
Dissolving 4, 4' -diaminodiphenyl ether and/or diaminodiphenyl propane in an organic solvent, then adding hexafluoro dianhydride, reacting at 40-60 ℃, and drying by a thermal polyimide method after the reaction is finished to obtain fluorine-containing polyimide;
(2) synthesis of Sulfur-containing polyimides
Dissolving 4,4 '-diaminodiphenyl ether and/or diaminonaphthalene in an organic solvent, then adding 4, 4' -bis (3, 4-dicarboxyphenylthio) diphenyl sulfide dianhydride, reacting at 40-60 ℃, and drying by a thermal polyimide method after the reaction is finished to obtain the sulfur-containing polyimide;
(3) mixing and dispersing fluorine-containing polyimide with the particle size of 10-50 microns, sulfur-containing polyimide with the particle size of 10-50 microns and superfine silicon dioxide with the particle size of less than or equal to 5 microns for 3-4min, then spraying the powder on the surface of a base material by adopting an electrostatic spraying method, and curing to obtain the high-temperature-resistant anticorrosive coating.
The molar ratio of the diamine to the dianhydride in the reaction is preferably 1:1, and other molar ratios are also possible.
The invention has the following beneficial effects:
the high-temperature-resistant anticorrosive coating provided by the invention has the properties of self-lubrication, high-temperature resistance and corrosion resistance, and the preparation method is simple, easy to operate and low in cost, and the components of the wear-resistant material are simple,Easy processing and easy popularization. The high-temperature-resistant anticorrosive coating has strong adhesive force, can resist high temperature up to 330 ℃, can resist low temperature up to-200 ℃, and resists H2S、CO2Corrosion and difficult aging, can protect production facilities under severe oil and gas extraction and collection environments, and prolongs the service life of the production facilities. The high-temperature-resistant anticorrosive coating has a good protection effect on oil and gas gathering and transportation pipelines, underground oil casings, small-sized equipment and parts. The formula composition and the preparation process of the invention are simple, the use of additives and complex processes required by the traditional coating are reduced, no solvent is used, the cost is reduced, and the environment is protected.
Detailed Description
The principles and features of this invention are described below in conjunction with embodiments, which are included to explain the invention and not to limit the scope of the invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
Example 1:
the high-temperature-resistant anticorrosive coating of the embodiment comprises: according to the mass percentage, the fluorine-containing polyimide accounts for 2 percent, the sulfur-containing polyimide accounts for 88 percent and the superfine silicon dioxide accounts for 10 percent.
The preparation method of the high-temperature-resistant anticorrosive coating comprises the following steps: and mixing and uniformly dispersing the fluorine-containing polyimide, the sulfur-containing polyimide and the superfine silicon dioxide, spraying the obtained material powder on the surface of a base material, and then curing to obtain the high-temperature-resistant anticorrosive coating.
Example 2:
the high-temperature-resistant anticorrosive coating of the embodiment comprises: according to the mass percentage, the fluorine-containing polyimide accounts for 15 percent, the sulfur-containing polyimide accounts for 50 percent and the superfine silicon dioxide accounts for 35 percent.
The preparation method of the high-temperature-resistant anticorrosive coating comprises the following steps: and mixing and uniformly dispersing the fluorine-containing polyimide, the sulfur-containing polyimide and the superfine silicon dioxide, spraying the obtained material powder on the surface of a base material, and then curing to obtain the high-temperature-resistant anticorrosive coating.
Example 3:
the high-temperature-resistant anticorrosive coating of the embodiment comprises: according to the mass percentage, the fluorine-containing polyimide comprises 10 percent of fluorine-containing polyimide, 70 percent of sulfur-containing polyimide and 20 percent of superfine silicon dioxide.
The preparation method of the high-temperature-resistant anticorrosive coating comprises the following steps: and mixing and uniformly dispersing the fluorine-containing polyimide, the sulfur-containing polyimide and the superfine silicon dioxide, spraying the obtained material powder on the surface of a base material, and then curing to obtain the high-temperature-resistant anticorrosive coating.
Example 4:
the high-temperature-resistant anticorrosive coating of the embodiment comprises: according to the mass percentage, the fluorine-containing polyimide accounts for 2 percent, the sulfur-containing polyimide accounts for 88 percent and the superfine silicon dioxide accounts for 10 percent.
The preparation method of the high-temperature-resistant anticorrosive coating comprises the following steps:
(1) synthesis of fluorine-containing polyimide
Dissolving 4, 4' -diaminodiphenyl ether in N, N-dimethylacetamide, adding hexafluoro dianhydride, reacting at 40 ℃, and drying by a thermal polyimide method after the reaction is finished to obtain fluorine-containing polyimide;
(2) synthesis of Sulfur-containing polyimides
Dissolving 4,4 '-diaminodiphenyl ether in N, N-dimethylacetamide, adding 4, 4' -bis (3, 4-dicarboxyphenylthio) diphenyl sulfide dianhydride, reacting for 6 hours at 40 ℃, and drying by a hot polyimide method after the reaction is finished to obtain sulfur-containing polyimide;
(3) mixing and dispersing fluorine-containing polyimide with the particle size of 10 microns, sulfur-containing polyimide with the particle size of 10 microns and superfine silicon dioxide with the particle size of less than or equal to 5 microns for 3min, then spraying the powder on the surface of a base material by adopting an electrostatic spraying method, and curing at 300 ℃ to obtain the high-temperature-resistant anticorrosive coating.
Example 5:
the high-temperature-resistant anticorrosive coating of the embodiment comprises: according to the mass percentage, the fluorine-containing polyimide accounts for 15 percent, the sulfur-containing polyimide accounts for 50 percent and the superfine silicon dioxide accounts for 35 percent.
The preparation method of the high-temperature-resistant anticorrosive coating comprises the following steps:
(1) synthesis of fluorine-containing polyimide
Dissolving diaminodiphenylpropane in N, N-dimethylformamide, adding hexafluoro-dianhydride, reacting at 45 ℃, and drying by a thermal polyimide method after the reaction is finished to obtain fluorine-containing polyimide;
(2) synthesis of Sulfur-containing polyimides
Dissolving diaminonaphthalene in N, N-dimethylformamide, adding 4, 4' -bis (3, 4-dicarboxyphenylthio) diphenyl sulfide dianhydride, reacting for 5 hours at 45 ℃, and drying by a hot polyimide method after the reaction is finished to obtain sulfur-containing polyimide;
(3) mixing and dispersing fluorine-containing polyimide with the particle size of 50 microns, sulfur-containing polyimide with the particle size of 50 microns and superfine silicon dioxide with the particle size of less than or equal to 5 microns for 4min, then spraying the powder on the surface of a base material by adopting an electrostatic spraying method, and curing at 400 ℃ to obtain the high-temperature-resistant anticorrosive coating.
Example 6:
the high-temperature-resistant anticorrosive coating of the embodiment comprises: according to the mass percentage, the fluorine-containing polyimide comprises 10 percent of fluorine-containing polyimide, 70 percent of sulfur-containing polyimide and 20 percent of superfine silicon dioxide.
The preparation method of the high-temperature-resistant anticorrosive coating comprises the following steps:
(1) synthesis of fluorine-containing polyimide
Dissolving diaminodiphenylpropane in N-methylpyrrolidone, adding hexafluoro-dianhydride, reacting at 60 ℃, and drying by a thermal polyimide method after the reaction is finished to obtain fluorine-containing polyimide;
(2) synthesis of Sulfur-containing polyimides
Dissolving diaminonaphthalene in N-methylpyrrolidone, adding 4, 4' -bis (3, 4-dicarboxyphenylthio) diphenyl sulfide dianhydride, reacting for 5.5h at 60 ℃, and drying by a hot polyimide method after the reaction is finished to obtain sulfur-containing polyimide;
(3) mixing and dispersing fluorine-containing polyimide with the particle size of 30 microns, sulfur-containing polyimide with the particle size of 15 microns and superfine silicon dioxide with the particle size of less than or equal to 5 microns for 3.5min, then spraying the powder on the surface of a base material by adopting an electrostatic spraying method, and curing at 350 ℃ to obtain the high-temperature-resistant anticorrosive coating.
Example 7:
the high-temperature-resistant anticorrosive coating of the embodiment comprises: according to the mass percentage, the fluorine-containing polyimide comprises 5 percent of fluorine-containing polyimide, 80 percent of sulfur-containing polyimide and 15 percent of superfine silicon dioxide.
This example was prepared in the same manner as example 6.
Example 8:
the high-temperature-resistant anticorrosive coating of the embodiment comprises: according to the mass percentage, the fluorine-containing polyimide accounts for 10 percent, the sulfur-containing polyimide accounts for 60 percent and the superfine silicon dioxide accounts for 30 percent.
This example was prepared in the same manner as example 6.
Example 9:
the high-temperature-resistant anticorrosive coating of the embodiment comprises: according to the mass percentage, the fluorine-containing polyimide comprises 10 percent of fluorine-containing polyimide, 70 percent of sulfur-containing polyimide and 20 percent of superfine silicon dioxide.
This example was prepared in the same manner as example 6.
Example 10:
the high-temperature-resistant anticorrosive coating of the embodiment comprises: according to the mass percentage, the fluorine-containing polyimide comprises 10 percent of fluorine-containing polyimide, 75 percent of sulfur-containing polyimide and 15 percent of superfine silicon dioxide.
This example was prepared in the same manner as example 6.
Example 11:
the high-temperature-resistant anticorrosive coating of the embodiment comprises: 8 percent of fluorine-containing polyimide, 74 percent of sulfur-containing polyimide and 18 percent of superfine silicon dioxide by mass percentage.
This example was prepared in the same manner as example 6.
Example 12:
the high-temperature-resistant anticorrosive coating of the embodiment comprises: 9 percent of fluorine-containing polyimide, 72 percent of sulfur-containing polyimide and 19 percent of superfine silicon dioxide by mass percentage.
This example was prepared in the same manner as example 6.
Example 13:
the raw material composition of the high temperature resistant anticorrosive coating of this example was the same as that of example 12.
The preparation method of the high-temperature-resistant anticorrosive coating comprises the following steps:
(1) synthesis of fluorine-containing polyimide
Dissolving 4, 4' -diaminodiphenyl ether and diaminodiphenyl propane (mixed in any ratio, in the embodiment, the volume ratio is 1:1) in a mixed solvent of N, N-dimethylacetamide and N, N-dimethylformamide (mixed in any ratio, in the embodiment, the volume ratio is 1:1), adding hexafluoro dianhydride, reacting at 50 ℃, and drying by a thermal polyimide method after the reaction is finished to obtain the fluorine-containing polyimide;
(2) synthesis of Sulfur-containing polyimides
Dissolving 4,4 '-diaminodiphenyl ether and diaminonaphthalene (in any ratio, in the embodiment, the volume ratio is 1:1) in a mixed solvent of N, N-dimethylacetamide and N, N-dimethylformamide (in any ratio, in the embodiment, the volume ratio is 1:1), adding 4, 4' -bis (3, 4-dicarboxyphenylthio) diphenyl sulfide dianhydride, reacting for 5.5 hours at 50 ℃, and drying by a thermal polyimide method after the reaction is finished to obtain the sulfur-containing polyimide;
(3) mixing and dispersing fluorine-containing polyimide with the particle size of 30 microns, sulfur-containing polyimide with the particle size of 15 microns and superfine silicon dioxide with the particle size of less than or equal to 5 microns for 3.5min, then spraying the powder on the surface of a base material by adopting an electrostatic spraying method, and curing at 350 ℃ to obtain the high-temperature-resistant anticorrosive coating.
Test example:
the coatings of examples 1-13 were tested for high temperature corrosion resistance in an acidic environment according to NACE-TM 0185-2006 Autoclave test for evaluating the corrosion-resistant inner coating of tubular plastics.
Preparing gas field water containing 1726.6mg NaCl, 57.4mg KCl and 9786.6mg MgCl per liter of deoxidized distilled water2，14498mg CaCl2，193.2mg NaHCO3And 110.8mg Na2SO4. The total pressure of the experiment is 9.0MPa, CO2Partial pressure of 0.77MPa, H2The S partial pressure is 0.66 MPa. Experiment temperature: 180 ℃ is carried out. The test period was 168 h.
And (3) placing the coating sample in a liquid phase according to NACE-TM 0185 requirements for a soaking test, and taking out the coating sample after a test period is reached to test the coating performance. The initial properties of the coating were also measured as a control. The test results are shown in the following table:
TABLE 1 coating Performance test
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. A high temperature resistant corrosion protective coating, comprising: according to the mass percentage, the fluorine-containing polyimide accounts for 8 percent to 10 percent, the sulfur-containing polyimide accounts for 70 percent to 75 percent and the superfine silicon dioxide accounts for 15 percent to 20 percent;
the fluorine-containing polyimide is prepared by synthesizing hexafluoro dianhydride and diamine in an organic solvent; the sulfur-containing polyimide is prepared by synthesizing 4, 4' -bis (3, 4-dicarboxyphenylthio) diphenyl sulfide dianhydride and diamine in an organic solvent; wherein the organic solvent is one or a mixture of N, N-dimethylacetamide, N-dimethylformamide and N-methylpyrrolidone;
the diamine for synthesizing the fluorine-containing polyimide comprises 4, 4' -diaminodiphenyl ether and/or diaminodiphenyl propane; diamines for synthesizing the sulfur-containing polyimides include 4, 4' -diaminodiphenyl ether and/or diaminonaphthalene.
2. The high-temperature-resistant anticorrosive coating as claimed in claim 1, wherein the synthesis temperature of the fluorine-containing polyimide and the sulfur-containing polyimide is 40-60 ℃, and the reaction time is 5-6 h.
3. The high-temperature-resistant anticorrosive coating according to claim 1, wherein the fluorine-containing polyimide has a particle size of 10-50 μm, the sulfur-containing polyimide has a particle size of 10-50 μm, and the ultrafine silica has a particle size of 5 μm or less.
4. The method for preparing the high-temperature-resistant anticorrosive coating according to any one of claims 1 to 3, characterized in that the fluorine-containing polyimide, the sulfur-containing polyimide and the ultrafine silica are mixed and uniformly dispersed, the obtained coating powder is sprayed on the surface of the substrate, and then the coating powder is cured to obtain the high-temperature-resistant anticorrosive coating.
5. The method for preparing a high temperature resistant anticorrosive coating according to claim 4, wherein the curing temperature is 300-400 ℃.
6. The method for preparing a high temperature resistant anticorrosive coating according to claim 4 or 5, characterized in that the preparation method comprises the steps of:
(1) synthesis of fluorine-containing polyimide
Dissolving 4, 4' -diaminodiphenyl ether and/or diaminodiphenyl propane in an organic solvent, then adding hexafluoro dianhydride, reacting at 40-60 ℃, and drying by a thermal polyimide method after the reaction is finished to obtain fluorine-containing polyimide;
(2) synthesis of Sulfur-containing polyimides
Dissolving 4,4 '-diaminodiphenyl ether and/or diaminonaphthalene in an organic solvent, then adding 4, 4' -bis (3, 4-dicarboxyphenylthio) diphenyl sulfide dianhydride, reacting at 40-60 ℃, and drying by a thermal polyimide method after the reaction is finished to obtain the sulfur-containing polyimide;
(3) mixing and dispersing fluorine-containing polyimide with the particle size of 10-50 microns, sulfur-containing polyimide with the particle size of 10-50 microns and superfine silicon dioxide with the particle size of less than or equal to 5 microns for 3-4min, then spraying the material powder on the surface of a base material by adopting an electrostatic spraying method, and curing to obtain the high-temperature-resistant anticorrosive coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910187487.1A CN109825185B (en) | 2019-03-13 | 2019-03-13 | High-temperature-resistant anticorrosive coating and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910187487.1A CN109825185B (en) | 2019-03-13 | 2019-03-13 | High-temperature-resistant anticorrosive coating and preparation method thereof |
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| Publication Number | Publication Date |
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| CN109825185A CN109825185A (en) | 2019-05-31 |
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