Pipeline inner cavity flow resistance reducing and corrosion resistance strengthening coating as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of coatings, and particularly relates to a pipeline inner cavity flow resistance reduction and corrosion resistance strengthening coating as well as a preparation method and application thereof. The nanometer attapulgite and zinc sulfate are adopted to prepare the nanometer attapulgite composite zinc oxide material, the nanometer attapulgite composite zinc oxide material is adopted to prepare the pipeline coating, the coating is tightly entangled with a resin chain by utilizing a nanometer size effect to reshape a microstructure, and the roughness of the coating is greatly reduced, so that the burden of fluid is reduced; meanwhile, other fillers are linked to construct a protection synergistic network, the corrosion resistance is further improved, a compound curing agent system is used in the curing process and is accurately crosslinked with the resin, a compact and stable three-dimensional network structure is rapidly formed, and the coating is endowed with high-strength mechanical and chemical stability. Compared with the traditional pipeline anti-drag paint, the pipeline anti-drag paint has the advantages that the flow resistance can be deeply reduced, the corrosion resistance of the paint is greatly improved, the problems of poor flow resistance and corrosion resistance in the pipeline are effectively solved, and the construction operation is convenient, so that the pipeline anti-drag paint has a very wide application prospect.

Description

Technical Field

[0001] The invention belongs to the technical field of coatings, and in particular relates to a pipeline inner cavity flow resistance reduction and corrosion resistance strengthening coating, and a preparation method and application thereof. Background Art

[0002] Pipeline transportation plays an indispensable role in key areas such as energy and chemical industry. A large amount of oil, natural gas and various chemical raw materials rely on pipelines for long-distance transportation. In this process, pipeline coating technology came into being, which aims to improve the performance of the inner wall of the pipeline and ensure transportation efficiency and pipeline life. Early coatings focused on achieving a single function. For example, some focused on drag reduction, reducing fluid friction by changing the surface properties of the coating; others focused on corrosion protection, using chemicals to prevent corrosive media from eroding the pipeline. However, as working conditions become more complex, the requirements for the comprehensive performance of coatings are increasing.

[0003] There are many drawbacks in the current pipeline coatings on the market. On the one hand, it is difficult to achieve both drag reduction and anti-corrosion performance. When some coatings pursue drag reduction, they cannot build an effective anti-corrosion barrier due to the limitations of coating materials or structural design, resulting in a sharp reduction in the life of the pipeline in a corrosive environment; on the contrary, coatings that focus on anti-corrosion often have a rough surface and a chemical composition that is unfavorable to fluid dynamics, causing greater fluid resistance and increasing transportation energy consumption. On the other hand, traditional coatings have prominent problems in the curing process, and the curing time is generally long, which slows down the construction progress. They are also easily affected by the ambient temperature and humidity, resulting in uneven coating quality and inability to stably exert protective effects.

[0004] Therefore, in order to overcome the shortcomings of existing coatings, it has become an urgent task to provide a pipeline internal drag-reducing coating with excellent comprehensive performance such as corrosion resistance, drag reduction and construction convenience and a preparation method thereof. Summary of the invention

[0005] In view of this, the present application provides a bisphenol A epoxy resin modified by a nano-attapulgite composite material and a pipeline inner cavity flow resistance reduction and corrosion resistance strengthening coating prepared therefrom and a preparation method thereof. The bisphenol A epoxy resin modified by the nano-attapulgite composite material can reshape the microstructure of the entire coating, so that its surface presents extraordinary flatness, reduces the roughness of the coating, and significantly reduces the friction resistance of the fluid when flowing through the pipeline. It also increases the path length and difficulty of the corrosive medium penetrating through the coating, and forms an insoluble zinc salt precipitate to block the pores of the coating, preventing the corrosive medium from further penetrating, thereby solving the technical problem that traditional pipeline inner coatings are difficult to achieve both drag reduction and corrosion protection at the same time.

[0006] In order to achieve the above object, the present invention includes the following technical solutions:

[0007] Technical solution 1:

[0008] A bisphenol A epoxy resin modified by a nano-attapulgite composite material, characterized in that: the bisphenol A epoxy resin modified by the nano-attapulgite composite material is prepared according to the following preparation method:

[0009] (1) putting the nano-attapulgite into a zinc sulfate solution, and adjusting the pH of the attapulgite-zinc sulfate mixed solution to 8.0-9.0 using an ammonium carbonate solution;

[0010] (2) stirring the solution at room temperature, precipitating the solution, and filtering the solution to obtain a precipitate;

[0011] (3) calcining the above precipitate to obtain a nano-attapulgite composite zinc oxide material;

[0012] (4) The nano-attapulgite composite zinc oxide material and bisphenol A epoxy resin are mixed at a mass ratio of 1:10-11, and stirred to obtain a bisphenol A epoxy resin modified by the nano-attapulgite composite material.

[0013] Furthermore, the bisphenol A epoxy resin modified by the nano-attapulgite composite material is characterized by:

[0014] The mass volume ratio of the nano-attapulgite to zinc sulfate in step (1) is 8-12 mg. The nano-attapulgite is put into 145-155 mL of zinc sulfate solution. The concentration of the zinc sulfate solution is 0.8-1.2 mol / L. The concentration of the ammonium carbonate solution is 0.8-1.2 mol / L.

[0015] The stirring speed in step (2) is 300-320 r / min, and the stirring is performed for 2-2.5 hours;

[0016] The calcination temperature in step (3) is 500-550° C. and the calcination time is 3-3.5 hours;

[0017] The rotation speed of step (4) is 1700-1800 r / min, and the stirring time is 3-3.5 hours.

[0018] Technical solution 2:

[0019] The application of the bisphenol A epoxy resin modified by the nano-attapulgite composite material described in the technical solution 1 is characterized in that the bisphenol A epoxy resin modified by the nano-attapulgite composite material is used to prepare a pipeline inner cavity flow resistance reduction and corrosion resistance strengthening coating.

[0020] Technical solution three:

[0021] A pipeline lumen flow resistance reduction and corrosion resistance strengthening coating implemented by the application of the second technical solution is characterized by comprising component A and component B:

[0022] The A component is mainly prepared from the following components according to the following mass ratio:

[0023] 200-230 parts of bisphenol A epoxy resin modified by the nano-attapulgite composite material according to claim 1 or 2,

[0024] 40-60 parts of polypentene resin,

[0025] 2-20 parts of phenolic glycidyl ether epoxy resin,

[0026] 67-83 parts of xylene,

[0027] 2.7-3.2 parts of polydimethylsiloxane defoamer,

[0028] 8-12 parts of polyamide wax powder,

[0029] Polyamide dispersant 1.5-2.4 parts

[0030] 40-60 parts of talcum powder,

[0031] Mica powder 200-250 parts,

[0032] 200-250 parts of diatom powder,

[0033] γ-(2,3-epoxypropoxy)propyltrimethoxysilane 1.5-2.0 parts,

[0034] Fluorine-modified acrylate leveling agent 0.8-1.0 parts,

[0035] 15-20 parts of n-butanol,

[0036] Propylene glycol methyl ether 35-45 parts;

[0037] The B component is mainly prepared from the following components according to the following molar ratio:

[0038] Diethylenetriamine 1.0,

[0039] Triethylenetetramine 1.0-1.2.

[0040] Furthermore, the pipeline lumen flow resistance reduction and corrosion resistance strengthening coating is characterized in that the pipeline lumen flow resistance reduction and corrosion resistance strengthening coating is prepared by mixing component A and component B in a mass ratio of 5.0-6.5:1 when in use.

[0041] Furthermore, the pipeline lumen flow resistance reduction and corrosion resistance strengthening coating is characterized in that the talc powder is 600-800 mesh talc powder, the mica powder is 600-800 mesh mica powder, and the diatom powder is 600-800 mesh diatom powder.

[0042] Technical solution 4:

[0043] The preparation method of the pipeline inner cavity flow resistance reduction and corrosion resistance strengthening coating described in the third technical solution is characterized by comprising the following steps:

[0044] (1) mixing bisphenol A epoxy resin modified by nano-attapulgite composite material, polypentene resin, phenolic glycidyl ether epoxy resin, and xylene, and stirring and mixing to obtain a mixed solution;

[0045] (2) adding a polydimethylsiloxane-based defoamer, polyamide wax powder, polyamide dispersant, talcum powder, mica powder, and diatom powder to the mixed solution, heating the solution to 50-55° C. and maintaining the temperature, stirring and mixing the mixture to obtain a dispersion;

[0046] (3) adding γ-(2,3-epoxypropoxy)propyltrimethoxysilane, fluorine-modified acrylate leveling agent, n-butanol, and propylene glycol methyl ether to the above dispersion, stirring and mixing to obtain component A;

[0047] (4) Diethylenetriamine and triethylenetetramine are mixed, the temperature is raised to 45-50°C and maintained at the temperature, and the mixture is stirred and mixed to obtain component B.

[0048] Furthermore, the method for preparing the pipeline lumen flow resistance reduction and corrosion resistance strengthening coating according to any one of claim 4 is characterized in that:

[0049] The stirring and mixing in step (1) is performed at a speed of 700-900 r / min and a stirring time of 5-7 minutes;

[0050] The stirring and mixing in step (2) is performed at a speed of 2700-3000 r / min and a stirring time of 10-15 minutes;

[0051] The stirring and mixing in step (3) is performed at a speed of 800-850 r / min and a stirring time of 10-15 minutes;

[0052] The stirring and mixing in step (4) is carried out at a rotation speed of 600-900 r / min, and the stirring time is 2-2.5 hours.

[0053] The nanometer material of the nanometer attapulgite material introduced in the present invention has an ultra-high specific surface area by virtue of its extremely small size effect. When it is combined with bisphenol A epoxy resin, it can be tightly entangled with the resin molecular chain like a "microscopic anchor point". Therefore, when the pipeline lumen flow resistance reduction and anti-corrosion strengthening coating prepared by using the bisphenol A epoxy resin modified by the nanometer attapulgite composite material prepared by the present invention as a raw material is coated on the inner lumen of the pipeline, the nanometer material can accurately fill the gaps between the resin molecules, reshape the microstructure of the entire coating, make its surface present an extraordinary flatness, and greatly reduce the roughness of the coating. When the fluid flows through the pipeline, it is no longer in contact with the relatively rough surface of the traditional coating, but with the nearly "super-slip" nanometer modified surface, and the friction resistance is significantly reduced, which opens up a new path for the fluid to pass through the pipeline efficiently and with low consumption. In addition, when preparing the bisphenol A epoxy resin modified by the nano-attapulgite composite material, a zinc sulfate solution is also mixed, and after calcination, a nano-attapulgite composite zinc oxide material is obtained. The coating of the present invention prepared by using the material presents a "knitted shape" on the pipeline surface, constructing a "maze barrier", which greatly increases the path length and difficulty of the corrosive medium penetrating through the coating; when the coating encounters a corrosive environment, the zinc ions in the zinc oxide undergo a replacement reaction with the corrosive anions that penetrate into the coating, forming an insoluble zinc salt precipitate to block the pores of the coating, preventing the corrosive medium from further penetrating. The B component of the pipeline lumen flow resistance reduction and corrosion-resistant strengthening coating prepared by the present invention adopts a composite curing agent system of diethylenetriamine and triethylenetetramine. Based on the chemical reaction kinetics, the special molecular structures and active groups of the two can quickly and accurately undergo a cross-linking reaction with the resin under mild and normal temperature conditions, and quickly weave a highly dense and stable three-dimensional network structure, giving the coating super strong mechanical strength and excellent chemical stability. It not only gets rid of the drawbacks of high-temperature curing, but also frees the construction operation from the constraints of complex environments. It is simple and easy, laying a solid foundation for large-scale applications. Therefore, this type of coating has a very broad application prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 This is a schematic diagram of the mechanism of the nano-attapulgite composite zinc oxide material in the coating described in this application.

[0055] Figure 2 This is a transmission electron microscope image of the nano-attapulgite composite zinc oxide material described in this application.

[0056] Figure 3 This is a particle size distribution diagram of the nano-attapulgite composite zinc oxide material described in this application. DETAILED DESCRIPTION

[0057] The exemplary embodiments disclosed in the present invention are described in more detail below. These embodiments are intended to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art. Although exemplary embodiments disclosed in the present invention are shown, it should be understood that the present invention should not be limited by the embodiments set forth herein.

[0058] The specific implementation methods and embodiments of the present invention are as follows:

[0059] (I) The specific implementation method of preparing the bisphenol A epoxy resin modified by the nano-attapulgite composite material of the present invention is as follows:

[0060] The preparation method of the bisphenol A epoxy resin modified by the nano-attapulgite composite material in the present invention comprises the following steps:

[0061] (1) putting 8-12 mg of nano-attapulgite into 145-155 mL of a 0.8-1.2 mol / L zinc sulfate solution, and adjusting the pH of the attapulgite-zinc sulfate mixed solution to 8.0-9.0 using a 0.8-1.2 mol / L ammonium carbonate solution;

[0062] (2) stirring the solution at room temperature at a rotation speed of 300-320 r / min for 2-2.5 hours to precipitate and filter to obtain a precipitate;

[0063] (3) calcining the precipitate at 500-550° C. for 3-3.5 hours to obtain a zinc oxide-loaded attapulgite nanocomposite material;

[0064] (II) The implementation method of the pipeline lumen flow resistance reduction and corrosion resistance strengthening coating of the present invention is as follows:

[0065] The pipeline lumen flow resistance reduction and anti-corrosion strengthening coating includes component A and component B:

[0066] The A component is mainly prepared from the following components according to the following mass ratio:

[0067] Bisphenol A epoxy resin modified by nano-attapulgite composite material 200-230g

[0068] Polypentene resin 40-60g

[0069] Phenolic glycidyl ether epoxy resin 2-20g

[0070] Xylene 67-83g

[0071] Polydimethylsiloxane defoaming agent 2.7-3.2g

[0072] Polyamide wax powder 8-12g

[0073] Polyamide dispersant 1.5-2.4 parts

[0074] Talc 40-60g

[0075] Mica powder 200-250g

[0076] Diatom powder 200-250g

[0077] γ-(2,3-Epoxypropyl)propyltrimethoxysilane 1.5-2.0g

[0078] Fluorine modified acrylate leveling agent 0.8-1.0g

[0079] n-Butanol 15-20g

[0080] Propylene glycol methyl ether 35-45g

[0081] The B component is mainly prepared from the following components according to the following molar ratio:

[0082] Diethylenetriamine 1.0

[0083] Triethylenetetramine 1.0-1.2.

[0084] The pipeline inner cavity flow resistance reduction and anti-corrosion strengthening coating is prepared by mixing component A and component B in a mass ratio of 5.0-6.5:1 when in use.

[0085] The talc powder is 600-800 mesh talc powder, the mica powder is 600-800 mesh mica powder, and the diatom powder is 600-800 mesh diatom powder.

[0086] The bisphenol A epoxy resin modified by the above nano-attapulgite composite material is prepared by the method provided by the present invention, and other materials are finished products that can be directly purchased from the market without the need for self-preparation.

[0087] (III) The method for preparing the pipeline lumen flow resistance reduction and corrosion resistance strengthening coating of the present invention is implemented as follows:

[0088] The preparation method of component A of pipeline lumen flow resistance reduction and anti-corrosion strengthening coating comprises the following steps:

[0089] (1) mixing bisphenol A epoxy resin modified by nano-attapulgite composite material, polypentene resin, novolac glycidyl ether epoxy resin, and xylene, and stirring at a speed of 700-900 r / min for 5-7 minutes to obtain a mixed solution;

[0090] (2) adding a polydimethylsiloxane-based defoamer, polyamide wax powder, polyamide dispersant, talc, mica powder, and diatom powder to the mixed solution in sequence, heating the mixture to 50-55° C. and maintaining the temperature, stirring the mixture at a speed of 2700-3000 r / min for 10-15 minutes to obtain a dispersion;

[0091] (3) Add γ-(2,3-epoxypropoxy)propyltrimethoxysilane, fluorine-modified acrylate leveling agent, n-butanol and propylene glycol methyl ether to the above dispersion, and stir at a speed of 800-850 r / min for 10-15 minutes to obtain component A.

[0092] Preparation method of component A of pipeline lumen flow resistance reduction and corrosion resistance strengthening coating:

[0093] Diethylenetriamine and triethylenetetramine are mixed, the temperature is raised to 45-50°C and maintained, and stirred at a speed of 600-900 r / min for 2-2.5 hours to obtain component B.

[0094] When in use, component A and component B are mixed in a mass ratio of 5.0-6.5:1.

[0095] The following embodiments are provided for the above-mentioned implementation mode:

[0096] Embodiment 1

[0097] Preparation of bisphenol A epoxy resin modified by nano-attapulgite composite material:

[0098] First, 8 mg of nano-attapulgite was put into 145 ml of 0.8 mol / L zinc sulfate solution, and the pH of the attapulgite-zinc sulfate mixed solution was adjusted to 8.0 with 0.8 mol / L ammonium carbonate solution, and stirred at room temperature for 2.5 hours at a stirring speed of 300 r / min. Finally, the obtained precipitate was filtered and then calcined at 500 ° C for 3.5 hours to obtain a zinc oxide-loaded attapulgite nanocomposite. Further, 5 g of zinc oxide-loaded attapulgite nanocomposite was added to 50 g of bisphenol A epoxy resin, stirred for 3.5 hours at a stirring speed of 1700 r / min, and the bisphenol A epoxy resin modified by the nano-attapulgite composite material was obtained after stirring.

[0099] The preparation of pipeline inner cavity flow resistance reduction and anti-corrosion strengthening coating includes the following steps:

[0100] 1) Preparation of component A:

[0101] 200g of bisphenol A epoxy resin modified by nano-attapulgite composite material, 40g of polypentene resin, 12g of phenolic glycidyl ether epoxy resin and 67g of xylene were mixed at a speed of 700r / min and stirred at a low speed for 7min to obtain a mixed solution; 2.7g of polydimethylsiloxane-based defoamer, 8g of polyamide wax micropowder, 1.5g of polyamide dispersant, 40g of 600-mesh talc, 200g of 600-mesh mica powder and 200g of 600 mesh diatom powder was added to the mixed solution in sequence, the temperature was raised to 50°C and maintained, the stirring speed was 2700r / min, and high-speed stirring and dispersion was performed for 15 minutes; after the high-speed dispersion was completed, 1.5g of γ-(2,3-epoxypropoxy)propyltrimethoxysilane, 0.8g of fluorine-modified acrylate leveling agent, 15g of n-butanol and 35g of propylene glycol methyl ether were added thereto, the rotation speed was maintained at 800r / min, and the mixture was stirred for 15 minutes to obtain component A.

[0102] 2) Preparation of component B:

[0103] Diethylenetriamine and triethylenetetramine in a molar ratio of 1.0:1.0 were mixed and stirred at a stirring speed of 600 r / min, the temperature of the mixed solution was maintained at 50° C., and the reaction time was 2.5 hours.

[0104] Embodiment 2

[0105] Preparation of bisphenol A epoxy resin modified by nano-attapulgite composite material:

[0106] First, 11 mg of nano-attapulgite was put into 150 mL of 1.1 mol / L zinc sulfate solution, and the pH of the attapulgite-zinc sulfate mixed solution was adjusted to 8.5 with 1.1 mol / L ammonium carbonate solution, and stirred at room temperature for 2.2 hours at a stirring speed of 310 r / min. Finally, the obtained precipitate was filtered and then calcined at 525 ° C for 3.2 hours to obtain a zinc oxide-loaded attapulgite nanocomposite. Further, 5 g of zinc oxide-loaded attapulgite nanocomposite was added to 53 g of bisphenol A epoxy resin, stirred for 3.2 hours at a stirring speed of 1750 r / min, and the bisphenol A epoxy resin modified by the nano-attapulgite composite material was obtained after stirring.

[0107] The preparation of pipeline inner cavity flow resistance reduction and anti-corrosion strengthening coating includes the following steps:

[0108] 1) Preparation of component A:

[0109] 210g of bisphenol A epoxy resin modified by nano-attapulgite composite material, 50g of polypentene resin, 15g of phenolic glycidyl ether epoxy resin and 75g of xylene were mixed at a speed of 800r / min and stirred at a low speed for 6min to obtain a mixed solution; 3.0g of polydimethylsiloxane defoamer, 10g of polyamide wax powder, 2.0g of polyamide dispersant, 50g of 700 mesh talc, 225g of 700 mesh mica powder and 225g 700 mesh diatom powder are added to the mixed solution in sequence, the temperature is raised to 53°C and maintained, the stirring speed is 2850r / min, and high-speed stirring and dispersion is performed for 13 minutes; after the high-speed dispersion is completed, 1.75g ​​of γ-(2,3-epoxypropoxy)propyltrimethoxysilane, 0.9g of fluorine-modified acrylate leveling agent, 17.5g of n-butanol and 40g of propylene glycol methyl ether are added thereto, the rotation speed is maintained at 825r / min, and the mixture is stirred for 13 minutes to obtain component A.

[0110] 2) Preparation of component B:

[0111] Diethylenetriamine and triethylenetetramine in a molar ratio of 1.0:1.1 were mixed and stirred at a stirring speed of 700 r / min, the temperature of the mixed solution was maintained at 47° C., and the reaction time was 2.3 hours.

[0112] Embodiment 3

[0113] Preparation of bisphenol A epoxy resin modified by nano-attapulgite composite material:

[0114] First, 12 mg of nano-attapulgite was put into 155 mLn of 1.2 mol / L zinc sulfate solution, and the pH of the attapulgite-zinc sulfate mixed solution was adjusted to 9.0 with 1.2 mol / L ammonium carbonate solution, and stirred at room temperature for 2 hours at a stirring speed of 320 r / min. Finally, the obtained precipitate was filtered and then calcined at 550 ° C for 3 hours to obtain a zinc oxide-loaded attapulgite nanocomposite. Further, 5 g of zinc oxide-loaded attapulgite nanocomposite was added to 55 g of bisphenol A epoxy resin, stirred for 3 hours at a stirring speed of 1800 r / min, and the bisphenol A epoxy resin modified by the nano-attapulgite composite material was obtained after stirring.

[0115] The preparation of pipeline inner cavity flow resistance reduction and anti-corrosion strengthening coating includes the following steps:

[0116] 1) Preparation of component A:

[0117] 230g of bisphenol A epoxy resin modified by nano-attapulgite composite material, 60g of polypentene resin, 20g of phenolic glycidyl ether epoxy resin and 83g of xylene were mixed at a speed of 900r / min and stirred at a low speed for 5min to obtain a mixed solution; 3.2g of polydimethylsiloxane defoamer, 12g of polyamide wax powder, 2.4g of polyamide dispersant, 60g of 800 mesh talc, 250g of 800 mesh mica powder and 250g 800 mesh diatom powder are added to the mixed solution in sequence, the temperature is raised to 55°C and maintained, the stirring speed is 3000r / min, and high-speed stirring and dispersion is performed for 10 minutes; after the high-speed dispersion is completed, 2.0g of γ-(2,3-epoxypropoxy)propyltrimethoxysilane, 1.0g of fluorine-modified acrylate leveling agent, 20g of n-butanol and 45g of propylene glycol methyl ether are added thereto, the rotation speed is maintained at 850r / min, and the mixture is stirred for 10 minutes to obtain component A.

[0118] 2) Preparation of component B:

[0119] Diethylenetriamine and triethylenetetramine in a molar ratio of 1.0:1.2 were mixed and stirred at a stirring speed of 900 r / min, the temperature of the mixed solution was maintained at 45° C., and the reaction time was 2 hours.

[0120] In order to demonstrate the beneficial effects of the present invention, the present invention also provides a comparative example, in which the bisphenol A epoxy resin modified by the nano-attapulgite composite material in Example 3 of the present invention is replaced with a bisphenol A epoxy resin purchased on the market, and the other components and preparation methods remain unchanged. The corresponding examples are as follows:

[0121] The comparative example comprises the following steps:

[0122] 1) Preparation of component A:

[0123] 230g of bisphenol A epoxy resin, 60g of polypentene resin, 20g of phenolic glycidyl ether epoxy resin and 83g of xylene were mixed at a speed of 900r / min and stirred at a low speed for 5min to obtain a mixed solution; 3.2g of polydimethylsiloxane-based defoamer, 12g of polyamide wax micropowder, 2.4g of polyamide dispersant, 60g of 800-mesh talc powder, 250g of 800-mesh mica powder and 250g of 800-mesh diatom powder were added to the mixed solution in sequence, the temperature was raised to 55°C and maintained, the stirring speed was 3000r / min, and high-speed stirring and dispersion was performed for 10min; after the high-speed dispersion was completed, 2.0g of γ-(2,3-epoxypropoxy)propyltrimethoxysilane, 1.0g of fluorine-modified acrylate leveling agent, 20g of n-butanol and 45g of propylene glycol methyl ether were added thereto, the speed was maintained at 850r / min, and the mixture was stirred for 10min to obtain component A.

[0124] 2) Preparation of component B:

[0125] Diethylenetriamine and triethylenetetramine in a molar ratio of 1.0:1.2 were mixed and stirred at a stirring speed of 900 r / min, the temperature of the mixed solution was maintained at 45° C., and the reaction time was 2 hours.

[0126] According to the three embodiments provided by the present invention, nine implementation samples were prepared and numbered 1-9 respectively. According to the comparative embodiment, three comparative samples were prepared and numbered 1-3 respectively. The spraying was carried out according to the A and B component ratios shown in the following table:

[0127]

[0128]

[0129] All the above sample coatings were painted according to the SY / T 0407-2012 standard method. The spraying steps are as follows:

[0130] 1. The anti-corrosion area of ​​the stainless steel plate of the coated workpiece is carefully pretreated and fully dried to remove the oxide scale, rust and oil on the surface to ensure good adhesion between the coating and the substrate.

[0131] 2. The surface of the stainless steel plate is treated by sandblasting technology to Sa 2.5 level specified in GB 8923-88. This level means that the surface treatment reaches a near-white level, with a high degree of cleanliness and surface roughness, laying a solid foundation for the effective adhesion of subsequent coatings.

[0132] 3. Use compressed air blowing or vacuum cleaning to remove surface dust. During this process, ensure that the cleanliness of the surface dust is not less than level 3 specified in ISO 8502-3 to avoid dust particles from having an adverse effect on the coating quality. At the same time, the surface anchor depth should be strictly controlled and adjusted to an appropriate range of 40μm to 70μm according to the SY / T 0319-2021 specification; or follow the ISO 8503-2 standard to reach the "medium (G)" level to ensure that the coating has good mechanical anchoring properties.

[0133] 4. The coatings of Application Examples 1 to 9 and Comparative Examples 1 to 3 are added to the spray gun respectively, and the workpiece is coated by spraying. The thickness of one spraying is 40 μm to 60 μm.

[0134] 5. Place the coated workpiece in a backlit environment for air drying and curing for 5 hours. This process utilizes natural environmental conditions to avoid uneven curing of the coating surface or other adverse effects caused by light, ensuring the stability and uniformity of the curing process.

[0135] 6. After the anti-corrosion coating of the workpiece to be coated is completely cured, the thickness of 10 different parts of the coating is accurately measured using an anti-corrosion coating thickness gauge in accordance with relevant measurement specifications, and the measurement data is recorded in detail. It should be noted that in order to ensure the best balance between coating quality and performance, the thickness of the anti-corrosion coating formed by one spraying should be strictly controlled and should not exceed 70μm. After the entire coating operation is completed, not only the coating thickness of a single measuring point should be monitored, but also the overall thickness of the anti-corrosion coating should be comprehensively measured to ensure that it meets the pre-set design requirements. After completing the thickness measurement, the overall condition of the anti-corrosion coating is carefully inspected, using professional detection methods, such as visual inspection combined with non-destructive testing technology, focusing on checking for defects such as leaks, pinholes, and bubbles. Once the above defects are found, they should be immediately repaired by a method that matches the original spraying process to ensure the integrity and continuity of the coating.

[0136] 7. Move the coated workpiece to a shaded and well-ventilated area and let it stand for 5 days. This standing process is intended to allow the coating to further post-cure under stable environmental conditions, release internal stress, and ensure that there are no defects on the coating surface caused by environmental factors or self-reaction. After 5 days of standing observation and confirming that there are no defects on the surface of the anti-corrosion coating, the workpiece can be officially put into use to ensure that it can perform its anti-corrosion performance stably and for a long time in actual working conditions.

[0137] After completing all the above operations on the coated workpieces of all the above embodiment samples, performance tests were performed according to the following test items:

[0138] Project Name Test Method Test Standards unit Resistant to boiling Boil in deionized water at 95°C for 1000 hours GB / T9274-1988 Acid corrosion resistance Place in 10% sulfuric acid (H2SO4) at room temperature for 30 days. GB / T9274-1988 Alkali corrosion resistance Place in 5% sodium hydroxide (NaOH) at room temperature for 30 days. GB / T9274-1988 Salt corrosion resistance Place in 3% sodium chloride (NaCl) at room temperature for 30 days. GB / T9274-1988 Salt spray resistant 1000 hours in salt spray GB / T1771-2007 Adhesion Pull-Apart Method GB / T5210-2006 MPa Liquidity SY / T6530-2019 Fineness GB / T1724-2019 μm Surface roughness Roughness Tester μm Solid content GB / T1725-2007 ％ Shear Strength GB / T7124-2008 MPa

[0139] The test results of the above-mentioned embodiment samples are as follows:

[0140]

[0141]

[0142] Note: N means the coating is intact and no bubbling, rust or cracking is found; S means slight discoloration; P means slight bubbling; A means no unevenness is found when applied on a vertical plane.

[0143] It can be seen from the test results in the above table that under the additive effect of nanoparticles, the pipeline lumen flow resistance reduction and anti-corrosion strengthening coating involved in the present invention exhibits excellent corrosion resistance. At the same time, the coating surface roughness formed by the coating is low. According to Darcy's formula, the head loss h f =λ·(l / d)·(v 2 / 2), after being treated with the drag-reducing coating of the present invention, the friction coefficient λ is significantly reduced. When the pipe length l, pipe diameter d and fluid flow rate v are kept constant, the head loss h is reduced due to the reduction of the friction coefficient λ. f According to the principle of energy conservation and fluid dynamics, this will increase the flow rate of the fluid in the pipeline, thereby significantly improving the fluid transportation efficiency. These results all show that the pipeline lumen flow resistance reduction and anti-corrosion strengthening coating of the present invention has both efficient drag reduction and anti-corrosion dual effects, and has important value in practical engineering applications.

[0144] The effect of the implementation of the present invention is not only verified from the above test results, but also supported from the structure and mechanism of the nano-attapulgite composite zinc oxide component used in the bisphenol A epoxy resin material modified by the nano-attapulgite composite material used in the present invention.

[0145] Figure 1The schematic diagram of the mechanism of the nano-attapulgite composite zinc oxide material in the pipeline lumen flow resistance reduction and anti-corrosion strengthening coating of the present invention involves multiple key stages. In the film-forming stage 1, based on the nano-size effect exhibited by the attapulgite composite zinc oxide material, the material can be tightly entangled with the resin chain. From a microscopic point of view, the size of the nanomaterial is extremely small, its specific surface area is large and the surface atomic activity is high. This characteristic causes a strong interaction between the attapulgite composite zinc oxide material and the resin chain, thereby reshaping the microstructure of the coating. In this process, the nanomaterial is like a "building unit" at the molecular level, which is precisely integrated into the network of the resin chain, changing the microscopic morphology and arrangement of the original system; entering stage 2, the nanomaterial can efficiently fill the gaps between other fillers with its tiny particle size. According to the surface roughness theory, the microscopic unevenness of the surface has a significant effect on the flow of the fluid. When the nanomaterial fills the gap, the microscopic profile of the coating surface becomes smoother and the surface roughness is greatly reduced. From the perspective of fluid mechanics, when the fluid flows through a pipe with a low surface roughness, the friction resistance it encounters is reduced, thereby "reducing the burden" on the fluid and effectively reducing the flow resistance in the inner cavity of the pipeline; when the coating is in a corrosive environment, the anti-corrosion mechanism of stage 3 begins to play a role. Zinc oxide, as an important functional component, will undergo ion exchange reactions when it encounters corrosive anions that penetrate into the coating. Specifically, the zinc ions in zinc oxide will be replaced with corrosive anions (such as chloride ions, sulfate ions, etc.) to form insoluble zinc salt precipitates. These precipitations are formed in the pores of the coating, like microscopic "plugs", effectively blocking the pore structure of the coating. According to the principle of corrosion electrochemistry, the intrusion of the corrosive medium is the key step leading to the corrosion of the coating, and the formation of the insoluble zinc salt precipitation prevents the corrosive medium from further penetrating into the interior of the coating, thereby significantly improving the corrosion resistance of the coating. In addition, the present invention adopts a composite curing agent system during the curing process, and the active groups in the composite curing agent react chemically with the corresponding functional groups in the resin molecules to form chemical bonds. This cross-linking reaction quickly builds a dense and stable three-dimensional network structure. From the perspective of material properties, this three-dimensional network structure gives the coating high mechanical stability, enabling it to withstand large external forces without being damaged; at the same time, it also gives the coating good chemical stability and enhances its resistance to corrosion by chemical substances.

[0146] Figure 2The transmission electron microscope image of the nano-concave convex rod composite zinc oxide material used in the present invention can clearly observe that the nano-concave convex rod presents a typical rod-like structure, which can build a complex path inside the coating. When the corrosive medium attempts to invade the coating, it will continuously change the direction of travel in the maze structure constructed by the rod-like concave convex rod, thereby significantly increasing the path length of the corrosive medium diffusion and enhancing the corrosion resistance of the coating. In addition, the rod-like structure of the nano-concave convex rod can form a relatively smooth and orderly microscopic topological structure on the coating surface, so that when the fluid flows through the coating surface, the interaction between molecules is more regular, reducing the local turbulence and energy loss caused by the microscopic unevenness of the surface, and effectively reducing the surface flow resistance of the coating. At the same time, the zinc oxide particles loaded on the surface of the nano-concave convex rod synergize with the nano-concave convex rod in the coating system, further strengthening the corrosion resistance of the coating of the present invention.

[0147] Figure 3 The particle size distribution diagram of the nano-attapulgite composite zinc oxide material used in the present invention is obtained by analysis that the average particle size of the material is 76nm. In the field of nanomaterial science, particle size is one of the key parameters that determine material performance, especially for the functional material of nano-attapulgite composite zinc oxide, the smaller the particle size, the more significant the nano-size effect. As the particle size decreases, the specific surface area of ​​the material increases sharply, and the proportion of surface atoms increases significantly. For the nano-attapulgite composite zinc oxide material with a particle size of 76nm, a large number of atoms are on the surface, and these surface atoms have highly unsaturated chemical bonds and higher activity. In the coating system, it produces a more intense and complex interaction with the resin, solvent and other additives in the coating. Taking the quantum size effect as an example, as the particle size is reduced to the nanoscale, the energy level structure of electrons undergoes a discrete change, making the optical, electrical and chemical properties of the material show characteristics that are completely different from those of macroscopic materials; at the same time, when the particle size is reduced to the nanoscale, the crystal structure and atomic arrangement of the nano-attapulgite composite zinc oxide material change, resulting in a significant improvement in its mechanical properties such as hardness and elastic modulus; in addition, the small size effect also affects the thermal stability of the material, allowing the nano-attapulgite composite zinc oxide material to withstand higher temperatures in the coating without performance degradation, thereby improving the performance of the coating in high temperature environments.

[0148] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A bisphenol A epoxy resin modified by a nano-attapulgite composite material, characterized in that: The bisphenol A epoxy resin modified by the nano-attapulgite composite material is prepared according to the following preparation method: (1) putting the nano-attapulgite into a zinc sulfate solution, and adjusting the pH of the attapulgite-zinc sulfate mixed solution to 8.0-9.0 using an ammonium carbonate solution; (2) stirring the solution at room temperature, precipitating the solution, and filtering the solution to obtain a precipitate; (3) calcining the above precipitate to obtain a nano-attapulgite composite zinc oxide material; (4) The nano-attapulgite composite zinc oxide material and bisphenol A epoxy resin are mixed at a mass ratio of 1:10-11, and stirred to obtain a bisphenol A epoxy resin modified by the nano-attapulgite composite material.

2. The bisphenol A epoxy resin modified by the nano-attapulgite composite material according to claim 1, characterized in that: The mass volume ratio of the nano-attapulgite to zinc sulfate in step (1) is 145-155 mL of zinc sulfate solution per 8-12 mg of nano-attapulgite, the concentration of the zinc sulfate solution is 0.8-1.2 mol / L, and the concentration of the ammonium carbonate solution is 0.8-1.2 mol / L; The stirring speed in step (2) is 300-320 r / min, and the stirring is performed for 2-2.5 hours; The calcination temperature in step (3) is 500-550° C. and the calcination time is 3-3.5 hours; The rotation speed of step (4) is 1700-1800 r / min, and the stirring time is 3-3.5 hours.

3. The use of the bisphenol A epoxy resin modified by the nano-attapulgite composite material according to claim 1 or 2, characterized in that: The bisphenol A epoxy resin modified by the nano-attapulgite composite material is used for preparing pipeline inner cavity flow resistance reduction and anti-corrosion strengthening coating.

4. A pipeline lumen flow resistance reduction and corrosion resistance enhancement coating, characterized in that: Including component A and component B: The A component is mainly prepared from the following components according to the following mass ratio: 200-230 parts of bisphenol A epoxy resin modified by the nano-attapulgite composite material according to claim 1 or 2, 40-60 parts of polypentene resin, 2-20 parts of phenolic glycidyl ether epoxy resin, 67-83 parts of xylene, 2.7-3.2 parts of polydimethylsiloxane defoamer, 8-12 parts of polyamide wax powder, Polyamide dispersant 1.5-2.4 parts 40-60 parts of talcum powder, Mica powder 200-250 parts, 200-250 parts of diatom powder, γ-(2,3-epoxypropoxy)propyltrimethoxysilane 1.5-2.0 parts, Fluorine-modified acrylate leveling agent 0.8-1.0 parts, 15-20 parts of n-butanol, Propylene glycol methyl ether 35-45 parts; The B component is mainly prepared from the following components according to the following molar ratio: Diethylenetriamine 1.0, Triethylenetetramine 1.0-1.

2.

5. The pipeline lumen flow resistance reduction and corrosion resistance strengthening coating according to claim 4, characterized in that: The pipeline inner cavity flow resistance reduction and anti-corrosion strengthening coating is prepared by mixing component A and component B in a mass ratio of 5.0-6.5:1 when in use.

6. The pipeline lumen flow resistance reduction and corrosion resistance strengthening coating according to claim 4, characterized in that: The talc powder is 600-800 mesh talc powder, the mica powder is 600-800 mesh mica powder, and the diatom powder is 600-800 mesh diatom powder.

7. A method for preparing the pipeline lumen flow resistance reduction and corrosion resistance strengthening coating according to claim 4, characterized in that: The following steps are involved: (1) mixing bisphenol A epoxy resin modified by nano-attapulgite composite material, polypentene resin, phenolic glycidyl ether epoxy resin, and xylene, and stirring and mixing to obtain a mixed solution; (2) adding a polydimethylsiloxane-based defoamer, polyamide wax powder, polyamide dispersant, talcum powder, mica powder, and diatom powder to the mixed solution, heating the solution to 50-55° C. and maintaining the temperature, stirring and mixing the mixture to obtain a dispersion; (3) adding γ-(2,3-epoxypropoxy)propyltrimethoxysilane, fluorine-modified acrylate leveling agent, n-butanol, and propylene glycol methyl ether to the above dispersion, stirring and mixing to obtain component A; (4) Diethylenetriamine and triethylenetetramine are mixed, the temperature is raised to 45-50°C and maintained at the temperature, and the mixture is stirred and mixed to obtain component B.

8. The method for preparing the pipeline lumen flow resistance reduction and corrosion resistance strengthening coating according to claim 7, characterized in that: The stirring and mixing in step (1) is performed at a speed of 700-900 r / min and a stirring time of 5-7 minutes; The stirring and mixing in step (2) is performed at a speed of 2700-3000 r / min and a stirring time of 10-15 minutes; The stirring and mixing in step (3) is performed at a speed of 800-850 r / min and a stirring time of 10-15 minutes; The stirring and mixing in step (4) is carried out at a rotation speed of 600-900 r / min, and the stirring time is 2-2.5 hours.

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