Microcapsule corrosion inhibitor for prolonging service life of coating and preparation method thereof
Microcapsule corrosion inhibitors were prepared by vacuum pressing and centrifugation of nanoporous silica and corrosion inhibitors, which solved the problem of insufficient adhesion of corrosion inhibitors, achieved excellent slow-release performance and extended coating life, and simplified the operation process.
Patent Information
- Application Number
- CN202210603042.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-05-30
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2042-05-30
AI Technical Summary
Existing corrosion inhibitors have weak adhesion to metal surfaces, requiring frequent monitoring and refilling, which consumes manpower and resources and limits their widespread application in the field of metal corrosion protection.
Microcapsule corrosion inhibitors were prepared by mixing nanoporous silica with corrosion inhibitors and then using vacuum pressing and centrifugation to ensure that the corrosion inhibitors were fully pressed into the cavities of the nanoporous silica. Stable nanoporous silica structures were then prepared by the Stobber method.
It achieves uniform dispersion and good slow-release performance of corrosion inhibitor, simplifies operation, extends the service life of coating, reduces the frequency of application, and improves the anti-corrosion effect.
Smart Images
Figure CN117187816B_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of microcapsule corrosion inhibitor preparation and coating, and particularly relates to a microcapsule corrosion inhibitor for prolonging the service life of a coating and a preparation method thereof. BACKGROUND
[0002] As a substance for protecting the surface of metal, the corrosion inhibitor can effectively inhibit the corrosion rate of metal and prolong the service life of metal. The corrosion inhibitor is widely used in the fields of petroleum pipelines and metal corrosion prevention, and the like. Since the main action mechanism of the corrosion inhibitor is to form a thin film on the surface of metal by combining physical adsorption and chemical adsorption to isolate the metal from other factors causing corrosion, in actual production and application, the adhesion of the corrosion inhibitor on the surface of metal is not strong, so that in order to maintain a certain effective concentration of the corrosion inhibitor in the filling area, a monitoring point needs to be set up to detect the concentration of the corrosion inhibitor after the corrosion inhibitor is filled for the first time, and the necessary working concentration of the corrosion inhibitor is maintained by a periodic filling method, which is very costly in terms of manpower and material resources. Since the traditional method of filling the corrosion inhibitor is too cumbersome and requires high professional requirements of personnel, the corrosion inhibitor is also limited to a certain extent as an effective means for metal corrosion prevention to be applied in a larger range. SUMMARY
[0003] The application aims to provide a microcapsule corrosion inhibitor for prolonging the service life of a coating and a preparation method thereof, so as to solve the problems in the prior art.
[0004] In order to achieve the above-mentioned purpose, the application provides the following technical scheme.
[0005] A preparation method of a microcapsule corrosion inhibitor comprises the following steps:
[0006] S1: mixing nano-mesoporous silica and a corrosion inhibitor, and stirring the mixture until it reaches a viscous state to obtain a mixture;
[0007] S2: placing the mixture under a pressure of-0.02 MPa to-0.08 MPa, and pressing the corrosion inhibitor into the cavities of the nano-mesoporous silica;
[0008] S3: after the volume of the mixture under constant pressure remains unchanged, placing the mixture under the above constant pressure for 25-35 minutes;
[0009] S4: performing solid-liquid separation on the mixture after standing by centrifugation, and obtaining a solid phase as the microcapsule corrosion inhibitor.
[0010] Further, the centrifugation time in S4 is 20-40 minutes, and the centrifugation rate is 1000-10000 r / min.
[0011] Further, the diameter of the nano-mesoporous silica is 100-200 nm.
[0012] Further, the pH value of the corrosion inhibitor in the microcapsule corrosion inhibitor is 6-8.
[0013] Further, the mixing ratio of the nano-mesoporous silica and the corrosion inhibitor is 1:(5-15).
[0014] Further, the nano-mesoporous silica is prepared by the stober method, and the steps for preparing the nano-mesoporous silica by the stober method include:
[0015] S101: using tetraethyl orthosilicate as a silica source material of the mesoporous microcapsule and using cetyltrimethylammonium bromide as a template agent of the mesoporous microcapsule to perform preparation preparation;
[0016] S102: obtaining the silica microcapsule covering the template agent by using hydrolysis and polymerization of the silica source material in an alkaline solution;
[0017] S103: removing the template agent in the silica microcapsule to complete the preparation of the nano-mesoporous silica.
[0018] Further, the method for removing the template agent in the silica microcapsule is to use a high-temperature calcination method or to add hydrochloric acid or an ethanol solution in the template agent.
[0019] Further, a silane coupling agent is added in the process for preparing the nano-mesoporous silica, and the ratio of the nano-mesoporous silica to the silane coupling agent is (10:1)-(5:1).
[0020] A microcapsule corrosion inhibitor is prepared by the method in the above claims 1-8.
[0021] Further, when applied in a coating, the mass fraction of the microcapsule corrosion inhibitor is 0.5%-5%.
[0022] Compared with the prior art, the advantages of the present application are that:
[0023] This invention discloses a method for preparing a microcapsule corrosion inhibitor. The method involves mixing nanoporous silica with a corrosion inhibitor and stirring until a viscous consistency is reached. The mixture is then placed under a vacuum of -0.02 MPa to -0.08 MPa, forcing the corrosion inhibitor into the cavities of the nanoporous silica. After the volume of the mixture remains constant under constant pressure, it is allowed to stand under vacuum for 25-35 minutes. The mixture is then centrifuged to separate the solid and liquid phases. The resulting solid phase is the microcapsule corrosion inhibitor. This method utilizes constant pressure to ensure more thorough insertion of the corrosion inhibitor into the cavities of the nanoporous silica. The vacuum standing and centrifugation process ensures that the nanoporous silica microcapsules are uniformly dispersed and do not agglomerate during subsequent reactions, resulting in excellent corrosion protection. Furthermore, this method features good sustained-release properties, simple operation, and promising market application prospects. Compared to traditional periodic application of corrosion inhibitors, microcapsule coatings offer superior sustained-release effects and extend the service life of pipes.
[0024] Furthermore, the method for preparing nanoporous silica via the Stober method is simple to operate, and the resulting nanoporous silica has a stable structure and is easy to process and fabricate.
[0025] Furthermore, methods such as removing the template agent by hydrochloric acid or ethanol solution, or by high-temperature calcination, can thoroughly and cleanly remove the template agent from the nanoporous silica, which is more conducive to the preparation of microcapsule corrosion inhibitors.
[0026] Furthermore, by adding a silane coupling agent during the preparation of nanoporous silica, and setting the ratio of nanoporous silica to silane coupling agent to be (10:1)-(5:1), the silane coupling agent can better modify the silica, allowing the mesoporous silica microcapsules to be evenly dispersed and not agglomerate in subsequent reactions, thereby further improving the preparation effect of nanoporous silica. Attached Figure Description
[0027] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:
[0028] Figure 1 This is a schematic diagram illustrating the loading process of preparing silica-loaded drug microcapsules, which is a microcapsule corrosion inhibitor for extending the service life of coatings according to the present invention and its preparation method.
[0029] Figure 2 The transmission electron microscopy characterization results of the microcapsule corrosion inhibitor in the present invention, which is used to extend the service life of a coating and its preparation method;
[0030] Figure 3 This is a immersion test of a coating without microcapsule corrosion inhibitor in the preparation method of the microcapsule corrosion inhibitor for extending the service life of a coating according to the present invention.
[0031] Figure 4 This is a coating immersion experiment showing the addition of the microcapsule corrosion inhibitor to the coating's service life and its preparation method, according to the present invention.
[0032] Figure 5 This is a flowchart illustrating the preparation process of a microcapsule corrosion inhibitor for extending the service life of a coating, as described in this invention.
[0033] Figure 6 This is a flowchart illustrating the preparation of nanoporous silica using the Stober method in the present invention, which describes a microcapsule corrosion inhibitor for extending the service life of a coating and its preparation method. Detailed Implementation
[0034] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.
[0035] The following detailed description is exemplary and intended to provide further detailed explanation of the invention. Unless otherwise specified, all technical terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this invention is for describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention.
[0036] The purpose of this invention is to provide a method for synthesizing imidazoline microcapsule corrosion inhibitors, which solves the problems existing in the current corrosion inhibitor application technology, effectively extends the shelf life and duration of action of the corrosion inhibitors, and the obtained microcapsule corrosion inhibitors are used as fillers in heavy-duty anti-corrosion coatings. Compared with coatings without microcapsule corrosion inhibitors, they can inhibit and delay metal corrosion under certain working conditions.
[0037] like Figure 5 As shown, a method for preparing a microcapsule corrosion inhibitor according to the present invention includes:
[0038] S1: Mix nanoporous silica with a corrosion inhibitor and stir until it reaches a viscous state to obtain a mixture;
[0039] S2: Place the mixture under a vacuum of -0.02MPa to -0.08MPa to force the corrosion inhibitor into the cavity of the nanoporous silica;
[0040] S3: After the volume of the mixture under constant pressure remains unchanged, place it under the above constant pressure conditions and let it stand for 25-35 minutes.
[0041] S4: After standing, the mixture is centrifuged to separate the solid and liquid phases. The resulting solid phase is the microcapsule corrosion inhibitor.
[0042] More specifically, mesoporous silica was prepared using the Stober method to obtain the shell of the microcapsule corrosion inhibitor. The mixture of nano-sized mesoporous silica and corrosion inhibitor was dispersed evenly in a high-speed shear disperser at a speed of 4000-6000 r / min until it reached a viscous state. The viscous mixture was then used to fill the cavities of the nano-silica with corrosion inhibitor through vacuuming and low-pressure loading. To ensure that the corrosion inhibitor was fully pressed into the silica cavities, it was allowed to stand for half an hour after vacuuming to allow the corrosion inhibitor to fully combine with the nano-silica, thus completing the physical method for the initial preparation of microcapsules. The vacuumed mixture was then placed in centrifuge tubes and centrifuged in a benchtop high-speed centrifuge at 4000-6000 r / min for half an hour to separate the solid and liquid components, with the solid being the microcapsule corrosion inhibitor.
[0043] More specifically, in S4 above, the centrifugation time of the mixture after vacuum settling is 20-40 minutes, and the centrifugation rate of the centrifuge containing the centrifuge tube is preferably 1000-10000 r / min.
[0044] More specifically, the diameter of the nanoporous silica is 100-200 nm.
[0045] More specifically, the target pH value of the corrosion inhibitor in the microcapsule corrosion inhibitor is 6-8; preferably, the pH value is adjusted to the target value by using a strong acid or strong base solution, preferably sodium hydroxide solution or hydrochloric acid.
[0046] More specifically, the mixing ratio of nanoporous silica to corrosion inhibitor is 1:(5-15).
[0047] More specifically, the preparation of nanoporous silica employs the Stobber method. The steps for preparing nanoporous silica using the Stobber method are described below. Figure 6 As shown, it includes:
[0048] S101: Tetraethyl orthosilicate is used as the silicon source material for mesoporous microcapsules, and hexadecyltrimethylammonium bromide is used as the template agent for mesoporous microcapsules for preparation.
[0049] S102: Silica microcapsules coated with template agents are obtained by hydrolysis and polymerization of silicon source materials in alkaline solution;
[0050] S103: Remove the template agent from the silica microcapsules to complete the fabrication of nanoporous silica.
[0051] More specifically, tetraethyl orthosilicate (TEOS) was selected as the silicon source material for the mesoporous microcapsules, and hexadecyltrimethylammonium bromide (CTAB) was selected as the pore-forming agent or template agent for the mesoporous microcapsules to prepare mesoporous silica. CTAB-coated silica microcapsules were obtained by hydrolysis and polymerization of the silicon source material in an alkaline solution; subsequently, the template agent was removed by hydrochloric acid or ethanol solution or high-temperature calcination to obtain mesoporous silica microcapsules. Furthermore, a silane coupling agent was uniformly added during the preparation of mesoporous silica in a ratio of silica:silane coupling agent = (10:1)-(5:1) to obtain modified silica.
[0052] The further coating process of the corrosion inhibitor involves dissolving 1 part of modified mesoporous nano silica into 5-10 parts of corrosion inhibitor, and adjusting the pH to 6.0-8.0 with hydrochloric acid or sodium hydroxide solution.
[0053] After stirring evenly at room temperature, the mixture is dispersed evenly until it reaches a viscous state using a high-speed shear disperser at a speed of 4000-6000 r / min.
[0054] The viscous mixture was subjected to a low-pressure loading method to fill the silica cavity with as much corrosion inhibitor as possible. After standing for half an hour, the vacuum-sealed mixture was placed into a centrifuge tube and centrifuged in a benchtop high-speed centrifuge at 4000-6000 r / min for half an hour. The resulting gel-like solid was the microcapsule corrosion inhibitor.
[0055] Furthermore, in application, the amount of microcapsule corrosion inhibitor added accounts for 0.5%-5% of the total mass fraction of the overall coating.
[0056] Furthermore, the method for removing the template agent from the silica microcapsules is to use high-temperature calcination or to add hydrochloric acid or ethanol solution to the template agent.
[0057] Example 1:
[0058] Nanoporous silica was prepared using the Stober method. The ratio of nanoporous silica to silane coupling agent was 10:1. In a beaker, 1 part of nanoporous silica was dissolved in 10 parts of corrosion inhibitor. The pH of the solution was adjusted to 6.0 with hydrochloric acid or sodium hydroxide solution. After stirring evenly at room temperature, the mixture of nanoporous silica and corrosion inhibitor was dispersed at 1000 r / min using a high-speed shear disperser to a ratio of 1:5 until a viscous state was reached. The corrosion inhibitor was then fully injected into the nanoporous silica cavities under a vacuum of -0.02 MPa and allowed to stand for half an hour to allow complete penetration of the corrosion inhibitor into the nanoporous silica. The mixture was then centrifuged at 1000 r / min for half an hour to separate the solid and liquid components, yielding a gel-like solid microcapsule corrosion inhibitor.
[0059] Example 2:
[0060] Nanoporous silica was prepared using the Stober method. The ratio of nanoporous silica to silane coupling agent was 10:1. In a beaker, 1 part of nanoporous silica was dissolved in 10 parts of corrosion inhibitor. The pH of the solution was adjusted to 7.0 with hydrochloric acid or sodium hydroxide solution. After stirring evenly at room temperature, the mixture of nanoporous silica and corrosion inhibitor was dispersed at 1000 r / min using a high-speed shear disperser to a ratio of 1:5 until a viscous state was reached. The corrosion inhibitor was then fully injected into the nanoporous silica cavities under a vacuum of -0.02 MPa and allowed to stand for half an hour to allow complete penetration of the corrosion inhibitor into the nanoporous silica. The mixture was then centrifuged at 1000 r / min for half an hour to separate the solid and liquid components, yielding a gel-like solid microcapsule corrosion inhibitor.
[0061] Example 3:
[0062] Nanoporous silica was prepared using the Stober method. The ratio of nanoporous silica to silane coupling agent was 10:1. In a beaker, 1 part of nanoporous silica was dissolved in 10 parts of corrosion inhibitor. The pH of the solution was adjusted to 8.0 with hydrochloric acid or sodium hydroxide solution. After stirring evenly at room temperature, the mixture of nanoporous silica and corrosion inhibitor was dispersed at 1000 r / min using a high-speed shear disperser to a ratio of 1:5 until a viscous state was reached. The corrosion inhibitor was then fully injected into the nanoporous silica cavities under a vacuum of -0.02 MPa and allowed to stand for half an hour to allow complete penetration of the corrosion inhibitor into the nanoporous silica. The mixture was then centrifuged at 1000 r / min for half an hour to separate the solid and liquid components, yielding a gel-like solid microcapsule corrosion inhibitor.
[0063] Example 4:
[0064] Nanoporous silica was prepared using the Stober method. The ratio of nanoporous silica to silane coupling agent was 7.5:1. In a beaker, 1 part of nanoporous silica was dissolved in 10 parts of corrosion inhibitor. The pH of the solution was adjusted to 6.0 with hydrochloric acid or sodium hydroxide solution. After stirring evenly at room temperature, the mixture of nanoporous silica and corrosion inhibitor was prepared at a ratio of 1:10 using a high-speed shear disperser at 5000 r / min and dispersed evenly until a viscous state was reached. The corrosion inhibitor was then fully injected into the nanoporous silica cavities under a vacuum of -0.05 MPa and allowed to stand for half an hour to allow complete penetration of the corrosion inhibitor into the nanoporous silica. The mixture was then centrifuged at 5000 r / min for half an hour to separate the solid and liquid components, yielding a gel-like solid microcapsule corrosion inhibitor.
[0065] Example 5:
[0066] Nanoporous silica was prepared using the Stober method. The ratio of nanoporous silica to silane coupling agent was 7.5:1. In a beaker, 1 part of nanoporous silica was dissolved in 10 parts of corrosion inhibitor. The pH of the solution was adjusted to 7.0 with hydrochloric acid or sodium hydroxide solution. After stirring evenly at room temperature, the mixture of nanoporous silica and corrosion inhibitor was prepared at a ratio of 1:10 using a high-speed shear disperser at 5000 r / min and dispersed evenly until a viscous state was reached. The corrosion inhibitor was then fully injected into the nanoporous silica cavities under a vacuum of -0.05 MPa and allowed to stand for half an hour to allow complete penetration of the corrosion inhibitor into the nanoporous silica. The mixture was then centrifuged at 5000 r / min for half an hour to separate the solid and liquid components, yielding a gel-like solid microcapsule corrosion inhibitor.
[0067] Example 6:
[0068] Nanoporous silica was prepared using the Stober method. The ratio of nanoporous silica to silane coupling agent was 7.5:1. In a beaker, 1 part of nanoporous silica was dissolved in 10 parts of corrosion inhibitor. The pH of the solution was adjusted to 8.0 with hydrochloric acid or sodium hydroxide solution. After stirring evenly at room temperature, the mixture of nanoporous silica and corrosion inhibitor was prepared at a ratio of 1:10 using a high-speed shear disperser at 5000 rpm and dispersed evenly until a viscous state was reached. The corrosion inhibitor was then fully injected into the nanoporous silica cavities under a vacuum of -0.05 MPa and allowed to stand for half an hour to allow complete penetration of the corrosion inhibitor into the nanoporous silica. The mixture was then centrifuged at 5000 rpm for half an hour to separate the solid and liquid components, yielding a gel-like solid microcapsule corrosion inhibitor.
[0069] Example 7:
[0070] Nanoporous silica was prepared using the Stober method. The ratio of nanoporous silica to silane coupling agent was 5:1. In a beaker, 1 part of nanoporous silica was dissolved in 10 parts of corrosion inhibitor. The pH of the solution was adjusted to 6.0 with hydrochloric acid or sodium hydroxide solution. After stirring evenly at room temperature, the mixture of nanoporous silica and corrosion inhibitor was prepared at 10000 r / min using a high-speed shear disperser to a ratio of 1:15, and the mixture was dispersed evenly until it reached a viscous state. The corrosion inhibitor was then fully injected into the nanoporous silica cavities under a vacuum of -0.08 MPa and allowed to stand for half an hour to allow complete penetration of the corrosion inhibitor into the nanoporous silica. The mixture was then centrifuged at 10000 r / min for half an hour to separate the solid and liquid components, yielding a gel-like solid microcapsule corrosion inhibitor.
[0071] Example 8:
[0072] Nanoporous silica was prepared using the Stober method. The ratio of nanoporous silica to silane coupling agent was 5:1. In a beaker, 1 part of nanoporous silica was dissolved in 10 parts of corrosion inhibitor. The pH of the solution was adjusted to 7.0 with hydrochloric acid or sodium hydroxide solution. After stirring evenly at room temperature, the mixture of nanoporous silica and corrosion inhibitor was prepared at 10000 r / min using a high-speed shear disperser to a ratio of 1:15, and the mixture was dispersed evenly until it reached a viscous state. The corrosion inhibitor was then fully injected into the nanoporous silica cavities under a vacuum of -0.08 MPa and allowed to stand for half an hour to allow complete penetration of the corrosion inhibitor into the nanoporous silica. The mixture was then centrifuged at 10000 r / min for half an hour to separate the solid and liquid components, yielding a gel-like solid microcapsule corrosion inhibitor.
[0073] Example 9:
[0074] Nanoporous silica was prepared using the Stober method. The ratio of nanoporous silica to silane coupling agent was 5:1. In a beaker, 1 part of nanoporous silica was dissolved in 10 parts of corrosion inhibitor. The pH of the solution was adjusted to 8.0 with hydrochloric acid or sodium hydroxide solution. After stirring evenly at room temperature, the mixture of nanoporous silica and corrosion inhibitor was prepared at a ratio of 1:15 using a high-speed shear disperser at 10000 r / min and dispersed evenly until a viscous state was reached. The corrosion inhibitor was then fully injected into the nanoporous silica cavities under a vacuum of -0.08 MPa and allowed to stand for half an hour to allow complete penetration of the corrosion inhibitor into the nanoporous silica. The mixture was then centrifuged at 10000 r / min for half an hour to separate the solid and liquid components, yielding a gel-like solid microcapsule corrosion inhibitor.
[0075] The above examples demonstrate how changing the ratio of silica to corrosion inhibitor, adjusting the pH of the microcapsule corrosion inhibitor, regulating the release concentration of the corrosion inhibitor, and modifying the chemical properties of the corrosion inhibitor's micromolecules can alter the functional group reaction conditions, thereby achieving different sustained-release effects.
[0076] like Figures 1-2 As shown, Figure 1 This is a schematic diagram illustrating the loading process of preparing silica-loaded drug microcapsules, which is a microcapsule corrosion inhibitor for extending the service life of coatings according to the present invention and its preparation method. Figure 2 This is a schematic diagram of the transmission electron microscopy characterization results of the microcapsule corrosion inhibitor in the preparation method of the microcapsule corrosion inhibitor for extending the service life of the coating of the present invention.
[0077] like Figures 3-4 As shown, Figure 3 This is a immersion test of a coating without microcapsule corrosion inhibitor in the preparation method of the microcapsule corrosion inhibitor for extending the service life of a coating according to the present invention. Figure 4 This invention relates to a microcapsule corrosion inhibitor for extending the service life of a coating and its preparation method, and describes the coating immersion experiment results after adding the microcapsule corrosion inhibitor. Figure 3 and Figure 4 The images, from left to right, show a comparison of the effects of coatings without microencapsulated corrosion inhibitors and coatings with microencapsulated corrosion inhibitors. Figure 3 AE and Figure 4 The figures for "ae" represent the effects of microcapsule coatings after immersion in the solution for 0, 8, 14, 57, and 66 days, respectively. As can be seen from the figures, Figure 3 In the immersion solution of the coating without added microcapsule corrosion inhibitor, the solution from AE gradually became turbid; while Figure 4The color of the immersion solution containing the microcapsule corrosion inhibitor remained unchanged compared to the state after day 0. This comparison more intuitively and effectively demonstrates that the structure of this invention, which combines the microcapsule corrosion inhibitor with the coating, offers excellent corrosion protection, good slow-release performance, simple operation, and promising market application prospects. Compared to traditional periodic application of corrosion inhibitors, the microcapsule coating exhibits superior slow-release effect and extends the service life of the pipe.
[0078] Furthermore, the immersion solution can be water, and the quantity and availability of the immersion solution used in the control experiment are exactly the same as those used in the control experiment. The single variable in the experiment is the addition or non-addition of the microcapsule corrosion inhibitor coating.
[0079] Furthermore, the specific pH values mentioned above have an error range of no more than ±0.5. Taking pH = 8.0 as an example, the pH range at this time is 7.5-8.5. pH values within the range of 7.5-8.5 are all within the scope of protection of this invention.
[0080] Preferably, the solution contains a pH range of acidity and alkalinity. In actual experiments, the pH value is preferably the middle value of the selectable range, such as pH=8.0.
[0081] Preferably, in the process of mixing nanoporous silica with a corrosion inhibitor and stirring until it reaches a viscous state, the corrosion inhibitor is then pressed into the cavity of the nanoporous silica under a vacuum of -0.02MPa to -0.08MPa, with the vacuum being -0.05MPa being the most preferred. Specifically, the corrosion inhibitor is injected into the cavity of the nanoporous silica at a pressure ranging from -0.02 MPa to -0.08 MPa, and the pressure is maintained at a constant level throughout the process. Within the vacuum range of -0.02 MPa to -0.08 MPa, the pressure determines the injection time. If the vacuum is too low, less than -0.02 MPa, the injection time will be too long, which is not conducive to the experiment. If the pressure is too high, exceeding -0.08 MPa, there is a risk that the corrosion inhibitor and the nanoporous silica may be damaged during the injection process.
[0082] This invention effectively extends the shelf life and service life of corrosion inhibitors by employing microencapsulation. When combined with traditional corrosion protection methods, it exhibits superior performance. For example, when microencapsulated corrosion inhibitors are combined with coatings applied to metal surfaces, compared to coatings without microencapsulated inhibitors, the microencapsulated inhibitors effectively extend the service life of the coating on the metal surface, imparting the advantages of the corrosion inhibitor to the coating without affecting its physical and chemical properties. Therefore, combining microencapsulated corrosion inhibitors as a novel additive with traditional corrosion protection methods can enhance the effect of microencapsulated corrosion inhibitors while maintaining the traditional physical and chemical properties of corrosion protection. This reduces the amount of corrosion inhibitor used and improves the corrosion protection effect on metals. The development and application of microencapsulated corrosion inhibitors can effectively promote the formation of a new type of corrosion protection method, mainly used for surface protection of carbon steel as the main pipe material, reducing the amount of corrosion inhibitor used and increasing the service life of the pipe material, thus achieving both economic and social benefits.
[0083] The microcapsule corrosion inhibitor developed in this invention, when combined with a coating, exhibits significant anti-corrosion effects and features good slow-release performance, simple technical operation, and promising market application prospects. Compared with traditional periodic application of corrosion inhibitors, the microcapsule coating has superior slow-release effects and extends the service life of pipes.
[0084] Example 10:
[0085] A microcapsule corrosion inhibitor for extending the service life of a coating is prepared by the methods described in Examples 1-9 above.
[0086] As is known from common technical knowledge, this invention can be implemented through other embodiments that do not depart from its spirit or essential characteristics. Therefore, the disclosed embodiments described above are merely illustrative in all respects and are not the only ones. All modifications within the scope of this invention or equivalent to the scope of this invention are included in this invention.
[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.
Claims
1. A method for preparing a microcapsule corrosion inhibitor, characterized in that, include: S1: Mix nanoporous silica with a corrosion inhibitor and stir until a viscous consistency is achieved to obtain a mixture; S2: Place the mixture under a vacuum of -0.02MPa to -0.08MPa to force the corrosion inhibitor into the cavity of the nanoporous silica; S3: After the volume of the mixture under constant pressure remains unchanged, place it under the above constant pressure condition and let it stand for 25-35 minutes. S4: After standing, the mixture is centrifuged to separate the solid and liquid phases. The resulting solid phase is the microcapsule corrosion inhibitor. The nanoporous silica was prepared using the Stober method, and the steps of preparing the nanoporous silica using the Stober method include: S101: Tetraethyl orthosilicate was used as the silicon source material for the mesoporous microcapsules, and hexadecyltrimethylammonium bromide was used as the template agent for the mesoporous microcapsules for pre-preparation. S102: Silica microcapsules coated with the template agent are obtained by hydrolysis and polymerization of silicon source material in alkaline solution; S103: Remove the template agent from the silica microcapsules to complete the fabrication of the nanoporous silica; The mixing ratio of the nanoporous silica to the corrosion inhibitor is 1:(5-15). A silane coupling agent is added during the preparation of the nanoporous silica, and the ratio of the nanoporous silica to the silane coupling agent is (10:1) to (5:1).
2. The method for preparing a microcapsule corrosion inhibitor according to claim 1, characterized in that, The centrifugation time in S4 is 20-40 minutes, and the centrifugation rate is 1000-10000 r / min.
3. The method for preparing a microcapsule corrosion inhibitor according to claim 1, characterized in that, The diameter of the nanoporous silica is 100-200 nm.
4. The method for preparing a microcapsule corrosion inhibitor according to claim 1, characterized in that, The corrosion inhibitor in the microcapsule corrosion inhibitor has a pH value of 6-8.
5. The method for preparing a microcapsule corrosion inhibitor according to claim 1, characterized in that, The method for removing the template agent from the silica microcapsules is to use a high-temperature calcination method, or to add hydrochloric acid or ethanol solution to the template agent.
6. A microencapsulated corrosion inhibitor, characterized in that, It is prepared by the method for preparing a microcapsule corrosion inhibitor according to any one of claims 1-5.
7. The microencapsulated corrosion inhibitor according to claim 6, characterized in that, When applied to coatings, the microcapsule corrosion inhibitor has a mass fraction of 0.5%-5%.
Citation Information
Patent Citations
Intelligent nanometer container capable of preventing corrosion of copper and copper alloy, and preparation and application methods thereof
CN106928806A