Search

EP-4741465-A1 - ANTI-CORROSION COATING, PREPARATION METHOD THEREFOR, AND USE THEREOF, AND COATED PRODUCT

EP4741465A1EP 4741465 A1EP4741465 A1EP 4741465A1EP-4741465-A1

Abstract

The present application provides an anti-corrosion coating, a preparation method and use thereof, and a coated product. Raw material components of the anti-corrosion coating include, based on parts by weight, 30 to 44 parts of epoxy resin and 1 to 10 parts of an azole-functionalized metal-organic framework material.

Inventors

  • LIN, YONG
  • ZHAO, LI
  • ZOU, Yongkun
  • MING, Keyu
  • ZHENG, Binming
  • LI, ZHONGHUA
  • LIU, XIAOWEN

Assignees

  • Wuhu Midea Kitchen And Bath Appliances MFG. Co., Ltd.

Dates

Publication Date
20260513
Application Date
20240821

Claims (15)

  1. An anti-corrosion coating, wherein raw material components of the anti-corrosion coating comprise, based on parts by weight: 30 to 44 parts of epoxy resin; and 1 to 10 parts of an azole-functionalized metal-organic framework material.
  2. The anti-corrosion coating according to claim 1, wherein the raw material components of the anti-corrosion coating further comprise, based on parts by weight: 1 to 12 parts of a curing agent; 1 to 28 parts of a filler; and 0.1 to 1 part of an adjuvant.
  3. The anti-corrosion coating according to claim 2, wherein the raw material components of the anti-corrosion coating comprise, based on parts by weight: 40 to 44 parts of the epoxy resin; 5 to 8 parts of the azole-functionalized metal-organic framework material; 8 to 10 parts of the curing agent; 23 to 26 parts of the filler; and 0.5 to 0.8 parts of the adjuvant.
  4. The anti-corrosion coating according to any one of claims 1 to 3, wherein the epoxy resin is selected from at least one of bisphenol A epoxy resin, phenolic epoxy resin, bisphenol F epoxy resin, or bisphenol S epoxy resin.
  5. The anti-corrosion coating according to any one of claims 1 to 4, wherein the azole-functionalized metal-organic framework material is selected from at least one of benzotriazole-metal-organic framework material, methylbenzotriazole-metal-organic framework material, benzothiazole-metal-organic framework material, or 2-mercaptobenzothiazole-metal-organic framework material.
  6. The anti-corrosion coating according to any one of claims 2 to 5, wherein: the curing agent is selected from at least one of imidazole, phenylenediamine, diaminodiphenylmethane, aromatic amine E, m-phenylenediamine, or polyamide; and/or the filler is selected from at least one of talc powder, carbon black, silica, titanium dioxide, mica powder, wollastonite powder, ceramic powder, or glass flakes; and/or the adjuvant is selected from at least one of a defoamer, a leveling agent, a thixotropic agent, a coupling agent, an anti-settling agent, or a dispersant.
  7. A method for preparing an anti-corrosion coating according to any one of claims 1 to 6, the method comprising: synthesizing a Zn-metal-organic framework material using a hydrothermal process; synthesizing an azole-functionalized metal-organic framework material by adding an azole ligand to the Zn-metal-organic framework material for a reaction; and uniformly mixing the azole-functionalized metal-organic framework material with an epoxy resin, and performing melt-extrusion and sieving on the mixture, to obtain the anti-corrosion coating.
  8. The method for preparing the anti-corrosion coating according to claim 7, wherein said synthesizing the Zn-metal-organic framework material using the hydrothermal process comprises: dissolving zinc nitrate and 2-thiophenecarboxylic acid in a mixed solution of water and methanol; adding sodium hydroxide, followed by 4,4'-bipyridine, into the mixed solution, uniformly mixing, and placing the mixture in a hydrothermal reactor for a reaction at 100°C to 150°C for 8 hours to 16 hours; and washing and drying, subsequent to the complete reaction, an obtained solid to obtain the Zn-metal-organic framework material.
  9. The method for preparing the anti-corrosion coating according to claim 7 or 8, wherein said synthesizing the azole-functionalized metal-organic framework material comprises: dispersing the Zn-metal-organic framework material in methanol, and adding the azole ligand for a reaction at 40°C to 70°C for 8 hours to 13 hours; and washing and drying, subsequent to the complete reaction, an obtained solid to obtain the azole-functionalized metal-organic framework material.
  10. The method for preparing the anti-corrosion coating according to claim 9, wherein the azole ligand comprises at least one of benzotriazole ligand, methylbenzotriazole ligand, 2-mercaptobenzothiazole ligand, benzimidazole ligand, or benzothiazole ligand.
  11. The method for preparing the anti-corrosion coating according to claim 10, wherein the azole-functionalized metal-organic framework material comprises at least one of benzotriazole-metal-organic framework material, methylbenzotriazole-metal-organic framework material, 2-mercaptobenzothiazole-metal-organic framework material, benzimidazole-metal-organic framework material, or benzothiazole-metal-organic framework material.
  12. Use of an anti-corrosion coating according to any one of claims 1 to 6 or an anti-corrosion coating prepared by a method according to any one of claims 7 to 11 in anti-corrosion of a metallic substrate.
  13. An anti-corrosion coating layer, wherein the anti-corrosion coating layer is obtained by uniformly coating, by means of electrostatic spraying, and curing an anti-corrosion coating according to any one of claims 1 to 6 or an anti-corrosion coating prepared by a method according to any one of claims 7 to 11 on a surface of a metallic substrate.
  14. A coated product, comprising: a metallic substrate; and an anti-corrosion coating according to any one of claims 1 to 6 or an anti-corrosion coating prepared by a method according to any one of claims 7 to 11, coated on the metallic substrate.
  15. The coated product according to claim 14, wherein the metallic substrate comprises an elemental metal or a metallic alloy.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to Chinese Patent Application No. 202410792638.7, entitled "ANTI-CORROSION COATING, PREPARATION METHOD AND USE THEREOF, AND COATED PRODUCT" and filed on June 18, 2024, and Chinese Patent Application No. 202410792625.X, entitled "ANTI-CORROSION COATING, PREPARATION METHOD AND USE THEREOF, AND COATED PRODUCT" and filed on June 18, 2024. The disclosures of the aforementioned applications are hereby incorporated by reference in their entireties. FIELD The present disclosure relates to the technical field of anti-corrosion materials, and particularly, to an anti-corrosion coating, a preparation method and use thereof, and a coated product. BACKGROUND In applications of metallic materials, corrosion of material surfaces and metallic components may cause incalculable losses. Therefore, it is particularly important to provide the metallic surfaces with an anti-corrosion coating layer of high-performance and long-term stability. Currently, the primary technical means involves constructing anti-corrosion coating polymer layers on the metallic surfaces. It is an effective solution to construct a highly efficient and dense cross-linked network in a resin system and introduce micro-nano scale fillers to synergistically improve the coating layers in terms of water vapor permeability resistance, moisture and heat resistance, stability, etc. It has been reported that efficient anti-corrosion effects can be achieved by introducing flaky fillers (such as graphite, graphene), micro-nano particle materials (such as nano-silica, metal oxide particles, wollastonite), etc., into resin materials such as E12 epoxy resin and polyester. For example, Chinese Patent Application CN 112409884 A discloses a coating prepared by introducing graphene oxide-ferroferric oxide nanoparticles into epoxy resin, which has a dual anti-corrosion effect combining surface super-hydrophobicity with graphene barrier effect. Chinese Patent Application CN 109957308 A discloses an anti-corrosion coating layer using epoxy resin as a film-forming substance, aluminum sulfate and polyaniline as adjuvants, and using aluminum sulfate and graphene as fillers, which can prevent infiltration of corrosive media and achieve excellent physical barrier and anti-corrosion capabilities of the anti-corrosion coating layer. However, the means of applying or spraying the anti-corrosion coating layers on the metallic surfaces exerts the anti-corrosion effect mainly through the physical barrier actions. However, for the passive anti-corrosion coating layer that merely relies on the physical barriers, it is difficult to meet long-term service requirements of metals in harsh environment, even if the micro-nano fillers are introduced into the coating materials. When the metals are used in high-temperature and high-humidity environment for long term, the presence of water vapor, corrosive ionic media, etc., which diffuse and migrate for a long period of time, can easily lead to defects such as bubbling, cracking, and perforation in some local weak regions of the anti-corrosion coating layers in case of poorly localized dispersion of the fillers, leading to localized corrosion. Thus, the anti-corrosion of the coating layers may be ineffective and the service life of the metals may be shortened. Moreover, the polymer resin system cannot completely block permeation of the water vapor. At the same time, the resin coating layers also have problems such as poor anti-aging performance and low mechanical strength. Under long-term hot water erosion and stress, the resin coating layers tend to crack, thereby providing channels for diffusion of water and ions, which further leads to the corrosion of metallic substrates. Such a process, to a certain extent, limits long-term applications of the resin-based anti-corrosion coating layers in long-term hot and humid environment. Therefore, it is urgent to provide a coating material that can be applied for a long time in hot and humid environment and has good corrosion resistance and an excellent anti-corrosion effect. SUMMARY The present disclosure aims to solve at least partially one of the technical problems in the related art. To this end, the present disclosure provides an anti-corrosion coating, a preparation method and use thereof, and a coated product. In a first aspect, the present disclosure provides an anti-corrosion coating. Raw material components of the anti-corrosion coating comprise, based on parts by weight, 30 to 44 parts of epoxy resin and 1 to 10 parts of an azole-functionalized metal-organic framework material. In some embodiments of the present disclosure, the raw material components of the anti-corrosion coating further comprise, based on parts by weight, 1 to 12 parts of a curing agent, 1 to 28 parts of a filler, and 0.1 to 1 part of an adjuvant. In some embodiments of the present disclosure, the raw material components of the anti-corrosion coating com