A heavy-duty anti-corrosion and anti-scaling epoxy powder coating, its preparation method and application

Abstract

This invention discloses a heavy-duty anti-corrosion and anti-scaling epoxy powder coating, its preparation method, and its application, belonging to the field of coating technology. According to the weight composition, the epoxy powder coating comprises the following components: 45-60 parts epoxy resin, 8-15 parts curing agent, 5-25 parts filler, 5-10 parts synthetic filler, 1-10 parts pigment, 0.25-5 parts defoamer, 0.25-5 parts leveling agent, 0.25-5 parts antioxidant, and 0.25-5 parts curing accelerator, with the sum of all components being 100%. This coating exhibits low porosity (level 1 to 2) and low scaling rate (0.687-0.728 × 10⁻⁶). ‑3 (mg / cm 3 This coating exhibits superior properties, including high adhesion (≥50 MPa, significantly exceeding the ≥20 MPa bond strength specified in standard SY / T0442-2018), low cathodic disbondment (only 2.3-2.5 mm at 65℃, 1.5V, and 48h), excellent abrasion resistance (20-24 mg per kg / 1000r on a CS-17 wheel), and the ability to pass an impact test at -30℃ and 5J. It is suitable for complex and harsh industrial environments such as petrochemicals, marine engineering, heat transfer, and water treatment, providing a reliable protective solution for equipment and pipelines.

Description

Technical Field

[0001] This invention belongs to the field of coating technology, specifically relating to a heavy-duty anti-corrosion and anti-scaling epoxy powder coating, its preparation method, and its application. Background Technology

[0002] The information disclosed in this background section is intended only to enhance understanding of the overall background of the invention and is not necessarily to be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.

[0003] In numerous industrial sectors such as petrochemicals, marine engineering, heat transfer, and water treatment, equipment and pipelines are exposed to harsh environments for extended periods, facing severe corrosion and scaling problems. From a corrosion perspective, traditional anti-corrosion coatings, such as ordinary paint coatings, have limited protective capabilities in extreme environments such as high temperature, high humidity, strong acids and alkalis, and high salinity. For example, in marine environments, the high salinity and abundant microorganisms of seawater easily damage ordinary anti-corrosion coatings, leading to corrosion of metal equipment. In the petrochemical field, equipment comes into contact with corrosive chemicals, making traditional anti-corrosion measures difficult to maintain long-term effectiveness. Regarding scaling, in heat transfer systems, the evaporation of heated water causes calcium and magnesium ions to form carbonate scale that adheres to the inner wall of the pipeline. Traditional anti-scaling methods, such as the addition of chemical agents, require continuous investment and may have environmental impacts. Some existing coatings are not effective at preventing scaling, and scale accumulation reduces heat transfer efficiency, increases operating costs, and can even lead to pipeline blockage. Therefore, there is an urgent need for a coating that simultaneously provides highly efficient heavy-duty corrosion protection and good anti-scaling properties to meet the protection needs of equipment and pipelines in complex industrial environments. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a heavy-duty epoxy powder coating that is both corrosion-resistant and scale-resistant, capable of withstanding harsh environments and effectively resisting corrosion and inhibiting scale formation. Through research on the selection of coating materials, optimization of the preparation process, and synergistic effects of various components, this invention aims to provide a reliable protective coating solution for industrial equipment and pipelines.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows:

[0006] In a first aspect, the present invention provides a heavy-duty anti-corrosion and anti-scaling epoxy powder coating, comprising the following components by weight: 45-60 parts epoxy resin, 8-15 parts curing agent, 5-25 parts filler, 5-10 parts synthetic filler, 1-10 parts pigment, 0.25-5 parts defoamer, 0.25-5 parts leveling agent, 0.25-5 parts antioxidant, and 0.25-5 parts curing accelerator, wherein the sum of all components is 100%.

[0007] In one or more embodiments, the epoxy resin includes at least one of Dow Chemical DER663U, DER663UE, Jiangsu Sanmu SM601, SM601R, 602R or SM604.

[0008] In one or more embodiments, the curing agent includes at least one of the following: Santex T6000 modified alkylphenol formaldehyde resin (USA), Sumiliteresin PR-50869B (Japan), or Kolon PFR (Korea).

[0009] In one or more embodiments, the filler comprises at least one of the following: Perstorp needle-shaped wood fibers (Finland) requiring ≥3000 mesh, Tatsumori needle-shaped wollastonite (Japan), Omya needle-shaped calcium carbonate (Germany), 3M ceramic microspheres W-410, high-gloss barium sulfate YL-909, or NB-806.

[0010] In one or more embodiments, the pigment includes at least one of titanium dioxide, permanent red, permanent violet, phthalocyanine blue, or medium chrome yellow.

[0011] In one or more embodiments, the defoamer includes at least one of BYK-1765, BYK-1690SD, BYK-1691SD, or BYK-1788.

[0012] In one or more embodiments, the leveling agent includes at least one of CLAYTONE-VZ, RHEOBYK-7405, or RHEOBYK-7502.

[0013] In one or more embodiments, the antioxidant includes at least one of the antioxidants RIANOX1010 and BASFIRGANOXB900.

[0014] In one or more embodiments, the curing accelerator includes at least one of AlzchemDYHARD-100S and CUREZOL2MZ-A.

[0015] In one or more embodiments, the synthetic filler comprises an intermediate and a coating material that coats the intermediate, wherein the intermediate comprises a scale inhibitor and nanomaterials. The mass ratio of the scale inhibitor to the nanomaterials is (0.5-5):(2-10), and the mass ratio of the intermediate to the coating material is (1-2):(0.2-5).

[0016] Further, the scale inhibitor is one or more of polyaspartic acid (PASA) and polyepoxysuccinic acid (PESA). The nanomaterial is one or more of nano-SiO2 and coal-based columnar nano-activated carbon. The coating material is polyethylene glycol-polylactic acid (PEG-PLA) or polyethylene glycol-polycaprolactone (PEG-PCL).

[0017] Secondly, the present invention provides a method for preparing the above-mentioned heavy-duty anti-corrosion and anti-scaling epoxy powder coating, comprising the following steps:

[0018] Epoxy resin, curing agent, filler, synthetic filler, pigment, defoamer, leveling agent, antioxidant and curing accelerator are mixed and dispersed, and then extruded, crushed and screened to obtain epoxy powder;

[0019] Epoxy powder is applied to the surface of the object to be coated and dried to obtain the heavy-duty anti-corrosion and anti-scaling epoxy powder coating.

[0020] In one or more embodiments, the method for preparing the synthetic filler includes the following steps: mixing nanomaterials and scale inhibitor solutions, heating and evaporating to prepare an intermediate; mixing the intermediate and coating material solutions, heating and evaporating to prepare the synthetic filler.

[0021] Further, the scale inhibitor solution is a 40-60 wt.% aqueous solution of scale inhibitor, preferably 50 wt.%.

[0022] Furthermore, after mixing the nanomaterials and the scale inhibitor solution, the mixture is ultrasonically dispersed for 5-60 minutes, preferably 5-10 minutes.

[0023] Furthermore, when preparing the intermediate by heating and evaporation, the heating temperature is 50-80℃, the relative pressure is -0.2 to -0.1 MPa, and the evaporation time is 1-12 h, preferably 1-3 h.

[0024] Furthermore, the coating material solution is a dichloromethane solution of the coating material with a mass fraction of 5-15 wt.%, preferably 10 wt.%.

[0025] Furthermore, after mixing the intermediate and coating material solutions, they are ultrasonically dispersed for 5-10 minutes.

[0026] Furthermore, when preparing the synthetic filler by heating and evaporation, the heating temperature is 40-60℃, the relative pressure is -0.2 to -0.1MPa, and the evaporation time is 1-6h.

[0027] In one or more embodiments, the mixing and dispersion is performed by uniform dispersion in a high-speed mixer. The rotation speed is 800-1000 r / min, and the mixing time is 30-45 minutes.

[0028] In one or more embodiments, extrusion is performed using a twin-screw extruder. The extrusion speed is set to 15-20 r / min, the zone one temperature is set to 70-75°C, and the zone two temperature is set to 100-110°C.

[0029] In one or more embodiments, the crushing process involves extruding the material and then grinding it with a pulverizer. The pulverizing speed is 500-600 r / min, and the pulverizing time is 10-15 minutes.

[0030] In one or more embodiments, the pulverized material is screened through a vibrating screen to obtain 120-150 mesh powder for later use, preferably 140 mesh.

[0031] In one or more embodiments, the object to be coated is heat-treated before the epoxy powder is applied. The heating time is 160-170°C.

[0032] In one or more embodiments, epoxy powder is applied to the surface of the object to be coated by spraying, with a spraying interval of 1-2 seconds, and the spraying is continuous at intervals to achieve a thickness of 300-400μm.

[0033] In one or more embodiments, the drying is performed at 160-170°C for 15-20 minutes.

[0034] Thirdly, the present invention provides a pipe comprising the aforementioned heavy-duty anti-corrosion and anti-scaling epoxy powder coating.

[0035] Fourthly, the present invention provides a device comprising the aforementioned heavy-duty anti-corrosion and anti-scaling epoxy powder coating.

[0036] The beneficial effects of this invention are as follows:

[0037] (1) This invention provides a heavy-duty epoxy powder coating with anti-corrosion and anti-scaling properties, including a synthetic filler with slow-release function. Due to the unique preparation method of the slow-release synthetic filler, the scaling rate ranges from 0.687 to 0.728 × 10⁻³ (mg / cm³). 3 This invention exhibits unique advantages in scale inhibition. Without compromising coating performance, it effectively reduces the formation of deposits and crystals, thereby controlling the scaling rate at a low level. Compared to traditional coatings, this invention's coating can more effectively prevent the adverse effects of scaling on coating performance.

[0038] (2) This invention provides a unique synthetic filler with slow-release function, which utilizes a specific scale inhibitor combined with nanomaterials to form an intermediate that can slowly release scale inhibitor components on the coating surface when in contact with water. At the same time, the intermediate is coated with a coating material, which can significantly reduce the adverse reaction between the scale inhibitor and the coating.

[0039] (3) The epoxy powder coating for heavy-duty corrosion protection and scale inhibition provided by this invention has a pull-out adhesion (MPa) / bond strength ≥50 MPa and a cathodic disbondment (65℃, 1.5V, 48h) of only 2.3-2.5 mm. The adhesion of this coating is significantly higher than the bond strength ≥20 MPa specified in standard SY / T0442-2018. This is mainly attributed to the reasonable proportion of each component in this invention, especially the dense polymer network structure synergistically constructed by epoxy resin and curing agent phenolic resin, and the crosslinking density increased by imidazole and dicyandiamide curing accelerators. This unique structure formed by scientific and reasonable proportioning results in very few pores and extremely high stability in the coating, effectively blocking the penetration of corrosive media. Compared with traditional coatings, the porosity is greatly reduced, thereby achieving a qualitative improvement in adhesion and significantly reducing the risk of corrosion caused by cathodic disbondment.

[0040] (4) The wear resistance of the coating of this invention (1kg / 1000r, CS-17 wheel) is 20-24mg, and it has passed the impact test at -30℃ and 5J. This excellent performance is mainly attributed to the reasonable selection and precise use of fillers. In the process of using fillers, needle-shaped, plate-shaped, and spherical fillers were selected, and the proportions were controlled to ensure that these fillers were uniformly and stably dispersed throughout the coating system. These fillers are equivalent to numerous tiny reinforcing units in the coating. When the coating is subjected to external forces (such as friction, scratching, impact, etc.), the fillers can effectively disperse and bear the external stress by virtue of their own structural characteristics, thereby significantly reducing the stress concentration borne by the coating body and avoiding premature cracking, damage, and other defects in the coating.

[0041] (5) The porosity of the coating of the present invention is in the range of 1 to 2. This is because the proportion of each component in the formulation is reasonable, and the imidazole or dicyandiamide curing accelerators play a full role, which greatly improves the crosslinking density of the coating, promotes a more compact molecular structure inside the coating, and effectively reduces the formation of pores.

[0042] (6) The coating of the present invention has low porosity (at level 1 to 2) and low scaling rate (0.687-0.728×10-3 (mg / cm³)). 3 This coating exhibits superior properties, including high adhesion (≥50 MPa, significantly exceeding the ≥20 MPa bond strength specified in standard SY / T0442-2018), low cathodic disbondment (only 2.3-2.5 mm at 65℃, 1.5V, and 48h), excellent abrasion resistance (20-24 mg per kg / 1000r on CS-17 wheels), and the ability to pass impact tests at -30℃ and 5J. It is suitable for complex and harsh industrial environments such as petrochemicals, marine engineering, heat transfer, and water treatment, providing a reliable protective solution for equipment and pipelines. Attached Figure Description

[0043] The accompanying drawings, which form part of this invention, 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 improper limitation of the invention.

[0044] Figure 1 This is a scanning electron microscope image after the scaling rate test in Embodiment 1 of the present invention; where a is the distorted CaCO3 crystal form and b is the morphology of the synthetic filler on the coating surface.

[0045] Figure 2 This is a scanning electron microscope image of Comparative Example 3 of the present invention after the scaling rate test. a is the conventional CaCO3 crystal form.

[0046] Figure 3 The porosity of the bonding surface observed under a 40x magnifying glass in Embodiment 1 of the present invention;

[0047] Figure 4 The porosity of the bonding surface was observed under a 40x magnifying glass as Comparative Example 1 of this invention. Detailed Implementation

[0048] All reagents are commercially available.

[0049] To enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention will be described in detail below with reference to specific embodiments.

[0050] Example 1

[0051] S1, Synthetic filler:

[0052] Ten parts of nano-SiO2 were weighed and mixed with one part of a 50 wt.% aqueous solution of polyepoxysuccinic acid (PESA), and the mixture was ultrasonically dispersed for 10 minutes. The mixture was then transferred to a round-bottom flask and continuously evaporated using a rotary evaporator at 70°C and a relative pressure of -0.2 MPa for 3 hours until the solvent was completely evaporated, thus obtaining the SiO2 / PASP intermediate. Next, one part of the SiO2 / PASP intermediate was mixed with two parts of a 10 wt.% solution of polyethylene glycol-polylactic acid (PEG-PLA) in dichloromethane, and ultrasonically dispersed for another 10 minutes. The mixture was then transferred to a round-bottom flask and continuously evaporated using a rotary evaporator at 60°C and a relative pressure of -0.2 MPa for 4 hours until the solvent was completely evaporated, thus obtaining the synthetic filler.

[0053] S2, the components of the heavy-duty anti-corrosion and anti-scaling coating include:

[0054] The epoxy resins selected were Dow Chemical's DER663U (30 parts) and DER663UE (29.5 parts);

[0055] The curing agent used is Sumiliteresin PR-50869B, and the dosage is (15 parts);

[0056] The fillers used were Perstorp needle-like wood fibers (3 parts), 3M ceramic microspheres W-410 (4 parts), and high-gloss barium sulfate YL-909 (8 parts);

[0057] Synthetic filler (5 parts);

[0058] The pigments are phthalocyanine blue (0.5 parts) and titanium dioxide (1 part);

[0059] The defoamer is BYK-1691SD (1 part);

[0060] Leveling agent RHEOBYK-7405 (1.5 parts);

[0061] Antioxidant BASFIRGANOX B900 (1 part);

[0062] The curing accelerator was AlzchemDYHARD-100S (0.5 parts).

[0063] The preparation method of the S3 heavy-duty anti-corrosion and anti-scaling functional coating is as follows:

[0064] The components of S2 were uniformly dispersed in a high-speed mixer (1000 r / min, 30 minutes). Then, they were extruded using a two-roll extruder (20 r / min), with the temperature of zone one set to 75℃ and zone two set to 100℃. After extrusion, the materials were crushed in a pulverizer (600 r / min, 15 minutes) and then sieved through a vibrating screen to obtain 140-mesh powder. The experimental steel parts (no restrictions on model or size) were heated to 160℃ in an oven. Then, the 140-mesh powder was sprayed onto the steel parts using an intelligent spray gun system to achieve a coating thickness of 300-400 μm. After that, the parts were placed in an oven and baked at 160℃ for 20 minutes. Finally, the parts were removed and allowed to cool naturally.

[0065] Example 2

[0066] Unlike Example 1, step S1 is different. Specifically:

[0067] S1: Weigh 10 parts of nano-coal columnar activated carbon and mix them with 1 part of a 50 wt% aqueous solution of polyepoxysuccinic acid (PESA). Disperse the mixture ultrasonically for 10 minutes. Then transfer the mixture to a round-bottom flask and evaporate it continuously for 3 hours at 70°C and -0.2 MPa relative pressure using a rotary evaporator until the solvent is completely evaporated, thus obtaining the C / PASP intermediate. Next, mix 1 part of the SiO2 / PASP intermediate with 2 parts of a 10 wt% polyethylene glycol-polylactic acid (PEG-PLA) dichloromethane solution, and disperse the mixture ultrasonically for 10 minutes. Transfer the mixture to a round-bottom flask and evaporate it continuously for 4 hours at 60°C and -0.2 MPa relative pressure using a rotary evaporator until the solvent is completely evaporated, thus obtaining the synthesized filler.

[0068] Comparative Example 1

[0069] Unlike Example 1, step S1 is different. Specifically:

[0070] S1: Weigh 10 parts of nano-coal columnar activated carbon and mix them with 1 part of 50wt% polyepoxysuccinic acid (PESA) aqueous solution, and then ultrasonically disperse them for 10 minutes. Then transfer them to a round bottom flask and continuously evaporate them for 3 hours at 70℃ and -0.2MPa relative pressure using a rotary evaporator until the solvent is completely evaporated, thereby obtaining the SiO2 / PASP intermediate.

[0071] Comparative Example 2

[0072] Unlike Example 1, step S1 is different. Specifically:

[0073] S1: Weigh 10 parts of nano-coal columnar activated carbon and mix them with 2 parts of 10wt% polyethylene glycol-polylactic acid (PEG-PLA) dichloromethane solution. Then, ultrasonically disperse the mixture for 10 minutes and transfer it to a round-bottom flask. Use a rotary evaporator to continuously evaporate the mixture for 3 hours at 60℃ and a relative pressure of -0.2MPa until the solvent is completely evaporated, thereby obtaining the synthetic filler.

[0074] Comparative Example 3

[0075] Unlike Example 1, step S1 is omitted and no synthetic filler is made; in step S2, the synthetic filler is 0 parts, and the remaining components are the same as in step S2 of Example 1; step S3 is the same as step S3 of Example 1.

[0076] Performance testing:

[0077] 1. Corrosion resistance test:

[0078] The coatings prepared in Examples 1-2 and Comparative Examples 1-3 were subjected to relevant corrosion resistance tests according to reference standards. The test results are shown in Table 1 below.

[0079] Table 1

[0080]

[0081] 2. Anti-scaling test:

[0082] Scaling rate test: Samples of Examples 1-2 and Comparative Examples 1-3 were prepared into 50*100*1mm plates, and then immersed in a 0.01mol / L CaCl2 and 0.01mol / L NaHCO3 aqueous solution for 24h at 70℃ and 1000r / min. The scaling test results are shown in Table 2 below.

[0083] Table 2

[0084]

[0085] As shown in Tables 1 and 2, only the coatings prepared in Examples 1 and 2 can simultaneously possess both heavy-duty corrosion protection and scale inhibition functions. The scale formation rate is (0.625-0.750)×10⁻⁶. -3 (mg / cm 3 / h), preferably (0.687-0.728)×10 -3 (mg / cm 3 / h).

[0086] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A heavy-duty anti-corrosion and anti-scaling epoxy powder coating, characterized in that, According to weight composition, it includes the following components: 45-60 parts epoxy resin, 8-15 parts curing agent, 5-25 parts filler, 5-10 parts synthetic filler, 1-10 parts pigment, 0.25-5 parts defoamer, 0.25-5 parts leveling agent, 0.25-5 parts antioxidant, and 0.5-5 parts curing accelerator, with the sum of all components being 100%. The synthetic filler includes an intermediate and a coating material that coats the intermediate, wherein the intermediate includes a scale inhibitor and nanomaterials; The scale inhibitor is one or more of polyaspartic acid or polyepoxysuccinic acid, and the nanomaterial is one or more of nano-SiO2 or coal-based columnar nano-activated carbon. The mass ratio of scale inhibitor to nanomaterial is (0.5-5):(2-10), and the mass ratio of intermediate to coating material is (1-2):(0.2-5).

2. The heavy-duty anti-corrosion and anti-scaling epoxy powder coating according to claim 1, characterized in that, The epoxy resin includes at least one of Dow Chemical DER663U, DER663UE, Jiangsu Sanmu SM601, SM601R, SM602R or SM604.

3. The heavy-duty anti-corrosion and anti-scaling epoxy powder coating according to claim 1, characterized in that, The curing agent includes at least one of the following: American Saint-Gobain T6000 modified alkylphenol formaldehyde resin, Japanese Sumitomo Chemical Sumiliteresin PR-50869B, or Korean Kolon PFR.

4. The heavy-duty anti-corrosion and anti-scaling epoxy powder coating according to claim 1, characterized in that, The filler includes at least one of the following: Perstorp needle-shaped wood fibers (requiring a mesh size of ≥3000), Tatsumori needle-shaped wollastonite (requiring a mesh size of ≥3000), Omya needle-shaped calcium carbonate (requiring a mesh size of ≥3000), 3M ceramic microspheres W-410, high-gloss barium sulfate YL-909, or NB-806.

5. The heavy-duty anti-corrosion and anti-scaling epoxy powder coating according to claim 1, characterized in that, Pigments include at least one of titanium dioxide, permanent red, permanent violet, phthalocyanine blue, or medium chrome yellow.

6. The heavy-duty anti-corrosion and anti-scaling epoxy powder coating according to claim 1, characterized in that, The defoamer includes at least one of BYK-1765, BYK-1690 SD, BYK-1691 SD or BYK-1788.

7. The heavy-duty anti-corrosion and anti-scaling epoxy powder coating according to claim 1, characterized in that, The leveling agent includes at least one of CLAYTONE-VZ, RHEOBYK-7405, or RHEOBYK-7502.

8. The heavy-duty anti-corrosion and anti-scaling epoxy powder coating according to claim 1, characterized in that, Antioxidants include at least one of the antioxidants RIANOX 1010 and BASF IRGANOX B900.

9. The heavy-duty anti-corrosion and anti-scaling epoxy powder coating according to claim 1, characterized in that, The curing accelerator includes at least one of AlzchemDYHARD-100S and CUREZOL 2MZ-A.

10. The heavy-duty anti-corrosion and anti-scaling epoxy powder coating according to claim 1, characterized in that, The coating material is polyethylene glycol-polylactic acid or polyethylene glycol-polycaprolactone.

11. The method for preparing a heavy-duty anti-corrosion and anti-scaling epoxy powder coating according to any one of claims 1-10, characterized in that, Includes the following steps: Epoxy resin, curing agent, filler, synthetic filler, pigment, defoamer, leveling agent, antioxidant and curing accelerator are mixed and dispersed, and then extruded, crushed and screened to obtain epoxy powder; Epoxy powder is applied to the surface of the object to be coated and dried to obtain the heavy-duty anti-corrosion and anti-scaling epoxy powder coating.

12. The method for preparing a heavy-duty anti-corrosion and anti-scaling epoxy powder coating according to claim 11, characterized in that, The method for preparing the synthetic filler includes the following steps: mixing nanomaterials and scale inhibitor solution, heating and evaporating to prepare an intermediate; mixing the intermediate and coating material solution, heating and evaporating to prepare the synthetic filler.

13. The method for preparing a heavy-duty anti-corrosion and anti-scaling epoxy powder coating according to claim 12, characterized in that, The scale inhibitor solution is a 40-60 wt.% aqueous solution of scale inhibitor; After mixing the nanomaterials and scale inhibitor solution, ultrasonically disperse them for 5-60 minutes. When preparing intermediates by heating and evaporation, the heating temperature is 50-80°C, the relative pressure is -0.2~-0.1MPa, and the evaporation time is 1-12h. The coating material solution is a dichloromethane solution with a mass fraction of 5-15 wt.% of the coating material; After mixing the intermediate and coating material solutions, they are ultrasonically dispersed for 5-10 minutes. When preparing synthetic fillers by heating and evaporation, the heating temperature is 40-60°C, the relative pressure is -0.2~-0.1MPa, and the evaporation time is 1-6h.

14. The method for preparing a heavy-duty anti-corrosion and anti-scaling epoxy powder coating according to claim 11, characterized in that, The mixing and dispersion is carried out by uniform dispersion in a high-speed mixer, wherein the rotation speed is 800-1000 r / min and the mixing time is 30-45 minutes.

15. The method for preparing a heavy-duty anti-corrosion and anti-scaling epoxy powder coating according to claim 11, characterized in that, The extrusion is performed using a twin-screw extruder, with the speed set at 15-20 r / min, the temperature in zone one set at 70-75℃, and the temperature in zone two set at 100-110℃.

16. The method for preparing a heavy-duty anti-corrosion and anti-scaling epoxy powder coating according to claim 11, characterized in that, The crushing process involves extruding the material and then grinding it in a pulverizer. The pulverizing speed is 500-600 r / min, and the pulverizing time is 10-15 minutes.

17. The method for preparing a heavy-duty anti-corrosion and anti-scaling epoxy powder coating according to claim 11, characterized in that, The material is screened into pulverized material and then sieved through a vibrating screen to obtain 120-150 mesh powder for later use.

18. The method for preparing a heavy-duty anti-corrosion and anti-scaling epoxy powder coating according to claim 4, characterized in that, Before the epoxy powder is applied to the surface of the object to be coated, the object is subjected to a heat treatment for a period of 160-170°C.

19. The method for preparing a heavy-duty anti-corrosion and anti-scaling epoxy powder coating according to claim 11, characterized in that, Epoxy powder is applied to the surface of the object to be coated by spraying, with a spraying interval of 1-2 seconds. The coating is applied continuously at intervals to achieve a thickness of 300-400µm.

20. The method for preparing a heavy-duty anti-corrosion and anti-scaling epoxy powder coating according to claim 11, characterized in that, The drying process involves drying at 160-170℃ for 15-20 minutes.

21. A pipe, characterized in that, Includes the heavy-duty anti-corrosion and anti-scaling epoxy powder coating as described in any one of claims 1-10, or the heavy-duty anti-corrosion and anti-scaling epoxy powder coating prepared by the preparation method described in any one of claims 11-20.

22. A device, characterized in that, Includes the heavy-duty anti-corrosion and anti-scaling epoxy powder coating as described in any one of claims 1-10, or the heavy-duty anti-corrosion and anti-scaling epoxy powder coating prepared by the preparation method described in any one of claims 11-20.

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