CN112662272A - Corrosion-resistant water-based epoxy self-repairing coating for petroleum casing pipe and preparation method and application thereof - Google Patents
Corrosion-resistant water-based epoxy self-repairing coating for petroleum casing pipe and preparation method and application thereof Download PDFInfo
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Abstract
The embodiment of the invention discloses an anticorrosive water-based epoxy self-repairing coating for a petroleum casing pipe, and a preparation method and application thereof, wherein the coating comprises a component A and a component B; the component A comprises the following raw materials in parts by weight: 1 part of water-based epoxy resin emulsion, 0.1-0.3 part of liquid epoxy resin, 0.05-0.1 part of self-repairing microcapsule emulsion, 0.1-0.5 part of deionized water, 0.005-0.01 part of corrosion inhibitor capsule, 0.02-0.05 part of bactericide, 0.02-0.05 part of flash rust inhibitor, 0.01-0.03 part of defoaming agent, 0.03-0.05 part of thickening agent, 0.01-0.03 part of flatting agent, 0.01-0.03 part of dispersing agent and 1.5-2.0 parts of pigment and filler; the component B comprises 0.5-3 parts of water-based epoxy curing agent and 0.1-0.5 part of film-forming assistant. The coating formed by the coating has a self-repairing function and excellent corrosion resistance.
Description
Technical Field
The embodiment of the invention relates to the technical field of anticorrosive coatings, and particularly relates to an anticorrosive waterborne epoxy self-repairing coating for a petroleum casing pipe, and a preparation method and application thereof.
Background
The anticorrosive coating is a liquid or solid material which can form a film to protect, decorate or perform other special functions (insulation, rust prevention, mildew prevention, heat resistance and the like) when being coated on the surface of an object under certain conditions. Since the early coatings mostly used vegetable oils as the main raw material, they were also called paints. Synthetic resins have now largely or completely replaced vegetable oils and are therefore known as coatings. The main functions are three points: protect, decorate, and cover the defect of product, promote the value of product.
With the development of society, more and more attention is paid to corrosion which is one of three major public harms of oil fields. The petroleum casing pipe is one of important supporting facilities of the oil field, is in a medium environment throughout the year, is very serious in corrosion, and can influence the normal operation of the whole oil field system when being corroded and damaged, thereby influencing the productivity of the oil field and causing huge direct and indirect losses. In recent years, a great deal of work is carried out in the aspects of material selection and design, advanced coating selection, cathode protection technology and the like for corrosion control of oil fields in China, and abundant experience is accumulated. With the development of oil fields, the prolonging of oil extraction time and the deterioration of environmental conditions, new requirements are put forward for the corrosion problem of oil casings.
The organic coating anticorrosion technology is simple to implement, low in cost and free of later maintenance, and can be used for corrosion prevention of the sleeve. Currently, oil casing anticorrosive coatings are mainly classified into organic solvent type coatings and solvent-free type coatings. Wherein the solvent-based coating can discharge a large amount of VOC in the coating drying process, thereby causing environmental pollution and resource waste. The solvent-free coating has high viscosity and is difficult to construct. Meanwhile, the organic coating is easy to scrape in the transportation and installation processes to cause the coating to be damaged, so that the oil casing metal is exposed in a corrosive environment to form a large cathode and a small anode, the cathode stripping occurs, and the service life of the coating is further shortened. The water-based paint has low VOC content, can be constructed at normal temperature, and has certain advantages, but the water-based paint is slightly inferior to solvent-based and solvent-free paints in the aspects of corrosion resistance and mechanical properties.
Therefore, it is an urgent technical problem to develop a water-based paint with excellent corrosion resistance and self-repairing function.
Disclosure of Invention
In order to overcome the defects of the prior art, the embodiment of the invention aims to provide the anticorrosive water-based epoxy self-repairing coating for the petroleum casing pipe and the preparation method and application thereof.
In a first aspect of the embodiment of the invention, the anticorrosion waterborne epoxy self-repairing coating for the petroleum casing pipe is provided, and the preparation raw materials of the coating comprise a component A and a component B;
the component A comprises the following preparation raw materials in parts by weight: 1 part of water-based epoxy resin emulsion, 0.1-0.3 part of liquid epoxy resin, 0.05-0.1 part of self-repairing microcapsule emulsion, 0.1-0.5 part of deionized water, 0.005-0.01 part of corrosion inhibitor capsule, 0.02-0.05 part of bactericide, 0.02-0.05 part of flash rust inhibitor, 0.01-0.03 part of defoaming agent, 0.03-0.05 part of thickening agent, 0.01-0.03 part of flatting agent, 0.01-0.03 part of dispersing agent and 1.5-2.0 parts of pigment and filler;
the component B comprises 0.5-3 parts of water-based epoxy curing agent and 0.1-0.5 part of film-forming assistant by weight.
Further, the waterborne epoxy resin emulsion is waterborne epoxy resin emulsion with the epoxy equivalent of 900-1000 g/mol.
Further, the liquid epoxy resin is a liquid epoxy resin with an epoxy equivalent of 150-200 g/mol.
Further, the coalescing agent includes at least one of propylene glycol methyl ether, propylene glycol butyl ether, and propylene glycol phenyl ether.
Furthermore, the pigment and filler comprises, by weight, 0.4-0.7 part of talcum powder, 0.2-0.3 part of silica micropowder, 0.1-0.5 part of zinc aluminum phosphate, 0.4-0.7 part of wet-process sericite powder and 0.006-0.01 part of argil.
Further, the preparation raw materials of the component A comprise the following components in parts by weight: 1 part of water-based epoxy resin emulsion, 0.2 part of liquid epoxy resin, 0.1 part of self-repairing microcapsule emulsion, 0.2 part of deionized water, 0.01 part of corrosion inhibitor capsule, 0.03 part of bactericide, 0.03 part of anti-flash rust agent, 0.04 part of thickener, 0.025 part of defoamer, 0.015 part of flatting agent, 0.025 part of dispersant and 1.5 parts of pigment and filler.
Further, the preparation raw materials of the component B comprise 1 part of water-based epoxy curing agent and 0.3 part of film-forming assistant in parts by weight.
In a second aspect of the embodiments of the present invention, there is provided a method for preparing an anticorrosive water-based epoxy self-repairing coating for petroleum casing, the method including:
uniformly mixing 0.1-0.5 part of deionized water, 0.02-0.05 part of anti-flash rust agent, 0.01-0.03 part of dispersing agent, 0.01-0.03 part of flatting agent, 0.01-0.03 part of defoaming agent and 0.02-0.05 part of bactericide, adding 1.5-2.0 parts of pigment and filler, stirring and dispersing to obtain water slurry;
uniformly mixing the water slurry, 1 part of water-based epoxy resin emulsion and 0.1-0.3 part of liquid epoxy resin, and then adding 0.05-0.1 part of self-repairing microcapsule emulsion, 0.005-0.01 part of corrosion inhibitor capsule and 0.03-0.05 part of thickening agent to obtain a component A;
uniformly mixing 0.5-3 parts of water-based epoxy curing agent and 0.1-0.5 part of film-forming assistant to obtain a component B;
and uniformly mixing the component A and the component B to obtain the waterborne epoxy anticorrosive paint.
In a third aspect of the embodiment of the invention, an anticorrosion coating is provided, and the anticorrosion coating is formed by coating and curing the anticorrosion waterborne epoxy self-repairing coating for the petroleum casing pipe.
In a fourth aspect of the embodiment of the invention, the application of the oil casing anticorrosion waterborne epoxy self-repairing coating as an anticorrosion coating on carbon steel substrates, stainless steel substrates and ceramic substrates is provided.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
the embodiment of the invention provides an anticorrosive water-based epoxy self-repairing coating for a petroleum casing, which comprises a component A and a component B as raw materials for preparation; the component A comprises the following preparation raw materials in parts by weight: 1 part of water-based epoxy resin emulsion, 0.1-0.3 part of liquid epoxy resin, 0.05-0.1 part of self-repairing microcapsule emulsion, 0.1-0.5 part of deionized water, 0.005-0.01 part of corrosion inhibitor capsule, 0.02-0.05 part of bactericide, 0.02-0.05 part of flash rust inhibitor, 0.01-0.03 part of defoaming agent, 0.03-0.05 part of thickening agent, 0.01-0.03 part of flatting agent, 0.01-0.03 part of dispersing agent and 1.5-2.0 parts of pigment and filler; the preparation raw materials of the component B comprise 0.5-3 parts of water-based epoxy curing agent and 0.1-0.5 part of film-forming assistant by weight; in the embodiment of the invention, the components are cooperated:
the liquid resin is blended into the aqueous epoxy resin emulsion. The liquid resin has higher functionality, and can improve the crosslinking density of a coating when mixed and spliced into a water-based paint system, thereby improving the corrosion resistance of the water-based epoxy paint; by adding the pigment, the filler and the self-repairing microcapsule emulsion, the wear resistance, the scratch resistance and the corrosion resistance of the coating are greatly improved. Meanwhile, when the coating is scratched and damaged, the scratched part can be repaired through the breakage of the self-repairing capsules, so that the cathode stripping resistance is improved. The corrosion inhibitor is prepared into capsules and added into the coating, so that the release time of the corrosion inhibitor is prolonged, and the corrosion resistance of the coating is improved. The water-based epoxy anticorrosive paint disclosed by the embodiment of the invention can adapt to high temperature, high pressure and H2S and CO2The environment can be used for long-term corrosion prevention of the petroleum casing.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of a preparation method of an anticorrosive water-based epoxy self-repairing coating for petroleum casing pipes, which is provided by the embodiment of the invention.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the embodiments of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that the present embodiments and examples are illustrative of the present invention and are not to be construed as limiting the present invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which embodiments of the invention belong. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the examples of the present invention are commercially available or can be obtained by an existing method.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows:
according to an exemplary embodiment of the invention, the anticorrosion waterborne epoxy self-repairing coating for the petroleum casing pipe is provided, and comprises a component A and a component B;
the component A comprises the following preparation raw materials in parts by weight: 1 part of water-based epoxy resin emulsion, 0.1-0.3 part of liquid epoxy resin, 0.05-0.1 part of self-repairing microcapsule emulsion, 0.1-0.5 part of deionized water, 0.005-0.01 part of corrosion inhibitor capsule, 0.02-0.05 part of bactericide, 0.02-0.05 part of flash rust inhibitor, 0.01-0.03 part of defoaming agent, 0.03-0.05 part of thickening agent, 0.01-0.03 part of flatting agent, 0.01-0.03 part of dispersing agent and 1.5-2.0 parts of pigment and filler;
the component B comprises 0.5-3 parts of water-based epoxy curing agent and 0.1-0.5 part of film-forming assistant by weight.
In the present embodiment, it is preferred that,
1 part of water-based epoxy resin emulsion, 0.1-0.3 part of liquid epoxy resin: the liquid resin is blended into the aqueous epoxy resin emulsion. The liquid resin has higher functionality, and can improve the crosslinking density of a coating when mixed and spliced into a water-based paint system, thereby improving the corrosion resistance of the water-based epoxy paint. The proportion can generate better synergistic effect, and the crosslinking density of the coating is improved; too high a liquid resin content leads to poor bending and impact resistance of the coating, and also to high costs; the same liquid resin content is too low, and the improvement of the corrosion resistance of the coating is limited, so that the expected effect is not achieved.
0.005-0.01 parts of corrosion inhibitor capsule: the corrosion inhibitor is prepared into the capsule by a conventional method, and the corrosion inhibitor capsule is added into the coating, so that the use efficiency of the corrosion inhibitor is improved, the effective period of the corrosion inhibitor is prolonged, and the corrosion resistance of the coating is improved. The slow release effect is difficult to achieve when the additive amount is too small, and the anti-corrosion capability of the coating is difficult to improve; the excessive addition of the water-soluble polymer easily causes the uneven dispersion of the capsules in the coating, thereby generating coating defects and reducing the corrosion resistance of the coating;
by adding the pigment, the filler and the self-repairing microcapsule emulsion, the wear resistance, the scratch resistance and the corrosion resistance of the coating are greatly improved. Meanwhile, when the coating is scratched and damaged, the scratched part can be repaired through the breakage of the self-repairing capsules, so that the cathode stripping resistance is improved. The corrosion inhibitor is prepared into capsules and added into the coating, so that the release time of the corrosion inhibitor is prolonged, and the corrosion resistance of the coating is improved. The water-based epoxy anticorrosive paint disclosed by the embodiment of the invention can adapt to high temperature, high pressure and H2S and CO2The environment can be used for long-term corrosion prevention of the petroleum casing.
Considering the external requirement of the sleeve and the matching of impressed current cathodic protection, the cathodic disbonding resistance of the coating needs to be examined. The solvent-free epoxy anticorrosive coating disclosed by the embodiment of the invention has a certain self-repairing function, and when the coating is scratched and damaged, the repairing material can be released through the rupture of the self-repairing capsules, so that the scratched part is repaired, and the cathode stripping resistance is improved.
In an optional embodiment, the aqueous epoxy resin emulsion is an aqueous epoxy resin emulsion having an epoxy equivalent of 900 to 1000 g/mol. The epoxy equivalent range is favorable for the coating to obtain good comprehensive performance, and if the epoxy equivalent is too high, the hydroxyl content is high, so that the chemical medium resistance of the coating is poor; if the epoxy equivalent is too low, the lower molecular weight easily results in poor bending resistance and impact resistance of the coating;
as an alternative embodiment, the liquid epoxy resin is a liquid epoxy resin having an epoxy equivalent of 150 to 200 g/mol. The epoxy equivalent range is favorable for the coating to obtain good comprehensive performance, and the epoxy equivalent is too high, so that the hydroxyl content is high, and the chemical medium resistance of the coating is poor; if the epoxy equivalent is too low, the lower molecular weight easily results in poor bending resistance and impact resistance of the coating;
as an optional embodiment, the preparation raw materials of the component a comprise, by weight: 1 part of water-based epoxy resin emulsion, 0.2 part of liquid epoxy resin, 0.1 part of self-repairing microcapsule emulsion, 0.2 part of deionized water, 0.01 part of corrosion inhibitor capsule, 0.03 part of bactericide, 0.03 part of anti-flash rust agent, 0.04 part of thickener, 0.025 part of defoamer, 0.015 part of flatting agent, 0.025 part of dispersant and 1.5 parts of pigment and filler.
As an optional embodiment, the preparation raw materials of the component B comprise 1 part of water-based epoxy curing agent and 0.3 part of film-forming assistant in parts by weight.
As an alternative embodiment, the weight ratio of the a component to the B component is 10: 2 to 3. The component B is a curing agent, the equivalent of active hydrogen is excessive due to excessive addition of the component B, the residual amino groups are not completely reacted, and the medium resistance of the coating is reduced due to the hydrophilic characteristic of the amino groups; the epoxy group in the component A is excessive due to too little addition of the component B, so that the epoxy resin cannot be completely cured, and the cross-linking density of the coating is not enough, so that the chemical medium resistance and the mechanical property of the coating are influenced;
the pigment and filler can be any pigment and filler commonly used in the prior art; in an optional embodiment, the pigment and filler comprises, by weight, 0.4-0.7 part of talcum powder, 0.2-0.3 part of silica micropowder, 0.1-0.5 part of zinc aluminum phosphate, 0.4-0.7 part of wet-process sericite powder and 0.006-0.01 part of argil. The addition of the pigment and the filler in the proportion can effectively improve the wear resistance, scratch resistance and corrosion resistance of the coating. The weight portions refer to the portions of talcum powder, silicon micropowder, zinc aluminum phosphate, wet-process sericite powder and argil in the preparation raw materials of the component A.
According to another exemplary embodiment of the embodiments of the present invention, there is provided a method for preparing the anticorrosion waterborne epoxy self-repairing coating for petroleum casing, as shown in fig. 1, the method includes:
s1, uniformly mixing 0.1-0.5 part of deionized water, 0.02-0.05 part of anti-flash rust agent, 0.01-0.03 part of dispersing agent, 0.01-0.03 part of flatting agent, 0.01-0.03 part of defoaming agent and 0.02-0.05 part of bactericide, adding 1.5-2.0 parts of pigment and filler, stirring and dispersing to obtain water slurry;
s2, uniformly mixing the water slurry, 1 part of water-based epoxy resin emulsion and 0.1-0.3 part of liquid epoxy resin, and then adding 0.05-0.1 part of self-repairing microcapsule emulsion, 0.005-0.01 part of corrosion inhibitor capsule and 0.03-0.05 part of thickening agent to obtain a component A;
s3, uniformly mixing 0.5-3 parts of water-based epoxy curing agent and 0.1-0.5 part of film-forming assistant to obtain a component B;
s4, uniformly mixing the component A and the component B to obtain the anticorrosive water-based epoxy self-repairing coating for the petroleum casing.
In the step S1, the stirring speed is 1500-2500 rpm, and the stirring time is 1-2 h; in the step S2, stirring is adopted for uniformly mixing, the stirring speed is 600-1000 rpm, and the time is 1-2 h; the water slurry can be quickly obtained after high-speed stirring; in the step S3, a stirring mode is adopted for uniformly mixing, the stirring speed is 600-1000 rpm, and the time is 1-2h, so that the uniformly mixing is facilitated.
In this embodiment, the corrosion inhibitor or the corrosion inhibitor capsule is a capsule prepared by a conventional method from a corrosion inhibitor (specifically, the corrosion inhibitor may be thiourea, or ampicillin sodium, or sodium nitrite), and as an optional embodiment, the preparation and modification of the corrosion inhibitor or the corrosion inhibitor capsule include the following steps:
(1) dissolving 2.5g of thiourea powder by using a small amount of deionized water, and slowly adding the dissolved thiourea powder into 20ml of 0.25g/ml of ethyl cellulose acetone solution under the condition of stirring at normal temperature to obtain a mixed clear solution;
(2) slowly dripping the solution into distilled water at 40 ℃ under the condition of stirring, and removing acetone under reduced pressure to obtain a water solution;
(3) the aqueous solution obtained was subsequently freeze-dried to obtain thiourea-ethylcellulose microcapsule powder.
The self-repairing microcapsule emulsion is a resin capsule commonly used in the prior art and can be purchased from Shanghai Yuyu New Material science and technology company Limited; as an alternative embodiment, the preparation of the self-healing microcapsule emulsion of the present example embodiment includes the following steps:
(1) graphene oxide samples were prepared by Hummer's method.
(2) Mixing graphene oxide with DMF solvent 1: 1 mixing into a suspension;
(3) adding 1g of silane coupling agent into 400ml of the mixed suspension obtained in the step 2), stirring for 1h, and standing overnight;
(4) and (4) filtering the liquid obtained in the step (3), washing the liquid for multiple times by using absolute ethyl alcohol, and drying the liquid to obtain the modified graphene oxide.
(5) 1g of modified graphene oxide, 10g of 128 epoxy resin and 100g of deionized water are blended and then dispersed at a high speed to form pickering emulsion, namely self-repairing microcapsule emulsion.
According to another typical implementation manner of the embodiment of the invention, an anticorrosion coating is provided, and the anticorrosion coating is formed by coating and curing the anticorrosion waterborne epoxy self-repairing coating for the petroleum casing pipe.
According to another typical implementation mode of the embodiment of the invention, the application of the anticorrosion waterborne epoxy self-repairing coating for the petroleum casing pipe as an anticorrosion coating on carbon steel substrates, stainless steel substrates and ceramic substrates is provided.
The following describes in detail an anticorrosion waterborne epoxy self-repairing coating for petroleum casing pipe according to the present application with reference to examples, comparative examples and experimental data. The water-based epoxy resin emulsion, the liquid epoxy resin, the bactericide, the flash rust inhibitor, the thickener, the defoamer, the dispersant and the flatting agent used in the embodiment of the invention are all purchased from Jiangtian chemical technology Limited company in Tianjin.
Example 1
The embodiment of the invention provides an anticorrosive water-based epoxy self-repairing coating for a petroleum casing and a preparation method thereof, wherein the method comprises the following steps:
step 1, mixing and stirring 0.3 part of deionized water, 0.03 part of anti-flash rust agent, 0.02 part of dispersing agent, 0.02 part of flatting agent, 0.01 part of defoaming agent and 0.05 part of bactericide in parts by weight, adding pigment and filler under the stirring condition, and continuously stirring and dispersing at a high speed to obtain water slurry;
step 2, mixing the obtained water slurry with 1 part of aqueous epoxy resin emulsion and 0.2 part of liquid epoxy resin, uniformly stirring, and slowly adding 0.08 part of self-repairing microcapsule emulsion, 0.08 part of corrosion inhibitor capsule and 0.03 part of thickening agent in the stirring process to obtain a component A of the aqueous epoxy anticorrosive paint;
step 3, mixing 2 parts of waterborne epoxy curing agent and 0.2 part of film-forming assistant, and uniformly stirring to obtain a component B of the waterborne epoxy anticorrosive paint;
step 4, setting the weight ratio of the component A to the component B as 1: 0.2, and uniformly mixing to obtain the water-based epoxy anticorrosive paint.
Example 2
The embodiment of the invention provides an anticorrosive water-based epoxy self-repairing coating for a petroleum casing and a preparation method thereof, wherein the method comprises the following steps:
step 1, mixing and stirring 0.4 part of deionized water, 0.02 part of anti-flash rust agent, 0.03 part of dispersing agent, 0.03 part of flatting agent, 0.02 part of defoaming agent and 0.05 part of bactericide in parts by weight, adding pigment and filler under the stirring condition, and continuously stirring and dispersing at a high speed to obtain water slurry;
step 2, mixing the obtained water slurry with 1 part of water-based epoxy resin emulsion and 0.3 part of liquid epoxy resin, uniformly stirring, and slowly adding 0.07 part of self-repairing microcapsule emulsion, 0.07 part of corrosion inhibitor capsule and 0.04 part of thickening agent in the stirring process to obtain a component A of the water-based epoxy anticorrosive paint;
step 3, mixing 3 parts of waterborne epoxy curing agent and 0.5 part of film-forming assistant, and uniformly stirring to obtain a component B of the waterborne epoxy anticorrosive paint;
step 4, setting the weight ratio of the component A to the component B as 1: 0.25, and mixing uniformly to obtain the water-based epoxy anticorrosive paint.
Example 3
The embodiment of the invention provides an anticorrosive water-based epoxy self-repairing coating for a petroleum casing and a preparation method thereof, wherein the method comprises the following steps:
step 1, mixing and stirring 0.4 part of deionized water, 0.02 part of anti-flash rust agent, 0.03 part of dispersing agent, 0.03 part of flatting agent, 0.02 part of defoaming agent and 0.05 part of bactericide in parts by weight, adding pigment and filler under the stirring condition, and continuously stirring and dispersing at a high speed to obtain water slurry;
step 2, mixing the obtained water slurry with 1 part of water-based epoxy resin emulsion and 0.3 part of liquid epoxy resin, uniformly stirring, and slowly adding 0.07 part of self-repairing microcapsule emulsion, 0.07 part of corrosion inhibitor capsule and 0.04 part of thickening agent in the stirring process to obtain a component A of the water-based epoxy anticorrosive paint;
step 3, mixing 0.5 part of waterborne epoxy curing agent and 0.1 part of film-forming assistant, and uniformly stirring to obtain a component B of the waterborne epoxy anticorrosive paint;
step 4, setting the weight ratio of the component A to the component B as 1: 0.25, and mixing uniformly to obtain the water-based epoxy anticorrosive paint.
Comparative example 1
The comparative example was carried out without adding the aqueous epoxy resin emulsion, and the procedure was otherwise as in example 1.
Comparative example 2
The comparative example was carried out without adding a liquid epoxy resin, and the procedure was otherwise as in example 1.
Comparative example 3
In the comparative example, "1 part of aqueous epoxy resin emulsion and 0.2 part of liquid epoxy resin" were replaced with "1.2 parts of ordinary epoxy resin", and the rest was the same as in example 1.
Comparative example 4
The comparative example was carried out without adding a corrosion inhibitor capsule, and the procedure was otherwise the same as in example 1.
Experimental example 1
The list of components for each example and each comparative example is shown in table 1.
TABLE 1
The properties of the solvent-free epoxy anticorrosive coatings obtained in examples 1 to 3 and comparative examples 1 to 3 were tested, and the properties of the obtained coatings and coatings thereof are shown in Table 2.
TABLE 2 product Performance testing
From the data in table 2, it can be seen that:
in comparative example 1, the coating was brittle, and the coating had poor bending resistance and impact resistance, as in example 1, except that no aqueous epoxy resin emulsion was added);
in the comparative example 2, liquid epoxy resin is not added, and the rest is the same as the example 1, so that the defects of poor adhesion and chemical medium resistance of the coating are existed, and the corrosion resistance of the coating is poor;
in the comparative example 3, 1 part of the waterborne epoxy resin emulsion and 0.2 part of the liquid epoxy resin are replaced by 1.2 parts of the common epoxy resin, and the rest is the same as the example 1, so that the defects of poor adhesion and chemical medium resistance of the coating are existed, and the corrosion resistance of the coating is poor;
in the comparative example 4, no corrosion inhibitor capsule is added, and the rest is the same as the example 1, so that the defect of poor chemical medium resistance of the coating is existed, and the corrosion resistance of the coating is poor;
in examples 1 to 3 of the present invention, the coating had good physicochemical properties, adhesion (circle drawing method 2, lattice drawing method 2), 2.5 degree bend resistance, no crack, impact resistance of 50kg cm, cathodic disbonding resistance (65 ℃ C., -1.5V, 30d) of less than 11mm, water absorption (25 ℃ C., 24h,%) of less than 0.6, spark resistance of greater than or equal to 1000V, and high temperature and high pressure resistance (total pressure of 20MPa, CO, total pressure of 20MPa, CO)2Partial pressure of 0.21MPa,3 percent NaCl,80 ℃, 200h) is intact, and the paint film has excellent chemical medium resistance.
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention without departing from the spirit or scope of the embodiments of the invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims of the embodiments of the present invention and their equivalents, the embodiments of the present invention are also intended to encompass such modifications and variations.
Claims (10)
1. The anticorrosion waterborne epoxy self-repairing coating for the petroleum casing pipe is characterized in that the preparation raw materials of the coating comprise a component A and a component B;
the component A comprises the following preparation raw materials in parts by weight: 1 part of water-based epoxy resin emulsion, 0.1-0.3 part of liquid epoxy resin, 0.05-0.1 part of self-repairing microcapsule emulsion, 0.1-0.5 part of deionized water, 0.005-0.01 part of corrosion inhibitor capsule, 0.02-0.05 part of bactericide, 0.02-0.05 part of flash rust inhibitor, 0.01-0.03 part of defoaming agent, 0.03-0.05 part of thickening agent, 0.01-0.03 part of flatting agent, 0.01-0.03 part of dispersing agent and 1.5-2.0 parts of pigment and filler;
the component B comprises 0.5-3 parts of water-based epoxy curing agent and 0.1-0.5 part of film-forming assistant by weight.
2. The anticorrosion waterborne epoxy self-repair coating for the petroleum casing pipe as claimed in claim 1, wherein the waterborne epoxy resin emulsion is a waterborne epoxy resin emulsion with an epoxy equivalent of 900-1000 g/mol.
3. The anticorrosive water-based epoxy self-repairing coating for the petroleum casing pipe as claimed in claim 1, wherein the liquid epoxy resin is a liquid epoxy resin with an epoxy equivalent of 150-200 g/mol.
4. The petroleum casing anticorrosion waterborne epoxy self-healing coating of claim 1, wherein the film-forming aid comprises at least one of propylene glycol methyl ether, propylene glycol butyl ether and propylene glycol phenyl ether.
5. The anticorrosion water-based epoxy self-repair coating for the petroleum casing pipe as claimed in claim 1, wherein the pigment and filler comprise, by weight, 0.4-0.7 part of talcum powder, 0.2-0.3 part of silica powder, 0.1-0.5 part of zinc aluminum phosphate, 0.4-0.7 part of wet-process sericite powder and 0.006-0.01 part of argil.
6. The anticorrosive water-based epoxy self-repairing coating for petroleum casings as claimed in claim 1, wherein the raw materials for preparing the component A comprise, in parts by weight: 1 part of water-based epoxy resin emulsion, 0.2 part of liquid epoxy resin, 0.1 part of self-repairing microcapsule emulsion, 0.2 part of deionized water, 0.01 part of corrosion inhibitor capsule, 0.03 part of bactericide, 0.03 part of anti-flash rust agent, 0.04 part of thickener, 0.025 part of defoamer, 0.015 part of flatting agent, 0.025 part of dispersant and 1.5 parts of pigment and filler.
7. The anticorrosive water-based epoxy self-repairing coating for petroleum casings as claimed in claim 1, wherein the weight ratio of the component A to the component B is 10: 2 to 3.
8. The preparation method of the anticorrosive water-based epoxy self-repairing coating for the petroleum casing pipe as claimed in any one of claims 1 to 7, wherein the method comprises the following steps:
uniformly mixing 0.1-0.5 part of deionized water, 0.02-0.05 part of anti-flash rust agent, 0.01-0.03 part of dispersing agent, 0.01-0.03 part of flatting agent, 0.01-0.03 part of defoaming agent and 0.02-0.05 part of bactericide, adding 1.5-2.0 parts of pigment and filler, stirring and dispersing to obtain water slurry;
uniformly mixing the water slurry, 1 part of water-based epoxy resin emulsion and 0.1-0.3 part of liquid epoxy resin, and then adding 0.05-0.1 part of self-repairing microcapsule emulsion, 0.005-0.01 part of corrosion inhibitor capsule and 0.03-0.05 part of thickening agent to obtain a component A;
uniformly mixing 0.5-3 parts of water-based epoxy curing agent and 0.1-0.5 part of film-forming assistant to obtain a component B;
and uniformly mixing the component A and the component B to obtain the waterborne epoxy anticorrosive paint.
9. The anti-corrosion coating is characterized by being formed by coating and curing any one of the anti-corrosion waterborne epoxy self-repairing coatings of 1-7 of the petroleum casing pipe.
10. The application of the oil casing anticorrosion waterborne epoxy self-repairing coating as claimed in any one of claims 1 to 7 as an anticorrosion coating on carbon steel substrates, stainless steel substrates and ceramic substrates.
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