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CN-121975382-A - Coating, preparation method and application

CN121975382ACN 121975382 ACN121975382 ACN 121975382ACN-121975382-A

Abstract

The invention discloses a coating, a preparation method and application thereof, and relates to the technical field of anti-corrosion coatings. The coating for forming the coating comprises 0.2-4wt% of lamellar filler, wherein the lamellar filler is added into the aqueous resin base material to obtain the coating, the filler in the coating forms a labyrinth-shaped three-dimensional structure, the coating is applied to the surfaces of heat transfer pipelines of a heat exchanger, particularly special-shaped pipelines such as semicircle pipes and the like, and the coating still has strong corrosion resistance when the thickness of a dry film of the coating is only 7-20 mu m. The special-shaped heat exchange pipeline in the heat exchanger is effectively protected under the thickness of the thin coating, and the coating provided by the invention has the advantages of simple preparation process, low cost and extremely high market application value.

Inventors

  • XIE JIAJING
  • HUANG JI

Assignees

  • 广东美的制冷设备有限公司

Dates

Publication Date
20260505
Application Date
20260408

Claims (17)

  1. 1. The coating is characterized by comprising a corrosion-resistant layer, wherein the corrosion-resistant layer is arranged on the surface of a metal part coated by a heat transfer pipe of the heat exchanger without fins; the coating for forming the corrosion-resistant layer comprises 0.2-4wt% lamellar filler; the dry film thickness of the corrosion-resistant layer is 7-20 mu m.
  2. 2. The coating of claim 1, wherein the coating used to form the corrosion-resistant layer comprises 0.2wt% to 2wt% lamellar filler.
  3. 3. The coating of claim 1, wherein the corrosion resistant layer comprises 1 to 10 layers of lamellar filler in the thickness direction; and/or the lamellar filler has a lamellar diameter of 1-10 mu m.
  4. 4. The coating of claim 1, wherein the lamellar filler comprises at least one of graphene-based nanoplatelets, nanoplatelet silicates, nanoplatelet phosphates, nanoplatelet sulfides, nanoplatelet oxides, nanoplatelet nitrides.
  5. 5. The coating of claim 1, wherein the finless clad metal part of the heat transfer tube of the heat exchanger comprises at least one of a round tube, an internally threaded tube, an oval tube, a straight-toothed tube, a semicircular tube, and a U-shaped tube; And/or the fins comprise at least one of flat sheets, bridge sheets, corrugated sheets, slotted sheets and vortex guide fins; and/or the material of the metal component is any one selected from aluminum alloy, copper alloy and stainless steel.
  6. 6. The coating of claim 1, wherein the coating used to form the corrosion-resistant layer further comprises an aqueous resin and a curing agent.
  7. 7. The coating of claim 6, wherein the coating is an aqueous one-component coating comprising 20wt% to 35wt% aqueous resin and 10wt% to 20wt% curing agent.
  8. 8. The coating of claim 7, wherein in the aqueous one-component coating, the aqueous resin comprises at least one of an epoxy modified acrylic resin, an aqueous fluorocarbon resin, an aqueous polyester resin, an aqueous silicone resin, a polyurethane resin, and a polyamide resin.
  9. 9. The coating of claim 6, wherein the coating is an aqueous two-component coating comprising a major component and a curative component in a weight ratio of 5-9:1.
  10. 10. The coating of claim 9, wherein the primary component comprises an epoxy resin and an epoxy modified resin.
  11. 11. The coating of claim 9, wherein the primary component comprises 30wt% to 40wt% epoxy resin and 30wt% to 50wt% epoxy modified resin.
  12. 12. The coating of claim 10, wherein the epoxy resin comprises at least one of a bisphenol a epoxy resin, a bisphenol F epoxy resin, a polyurethane modified epoxy resin, a cycloaliphatic epoxy resin, and a multifunctional epoxy resin; And/or the epoxy modified resin comprises at least one of epoxy modified organic silicon resin, epoxy modified acrylic resin and epoxy modified phenolic resin.
  13. 13. The coating of claim 9, wherein the curative component comprises a polyamide curative and a phenolic ammonia curative.
  14. 14. The coating of claim 9, wherein the curative component comprises 40wt% to 70wt% polyamide curative and 1wt% to 20wt% phenolic ammonia curative.
  15. 15. A method of producing a coating as claimed in any one of claims 1 to 14, comprising the steps of: S1, preparing a coating by using lamellar fillers; s2, coating the coating prepared in the step S1 on the surface of the metal part, curing to form a corrosion-resistant layer, and completing the preparation of the coating.
  16. 16. The method for preparing a coating according to claim 15, wherein in the step S2, the coating is an aqueous single-component coating, the curing temperature is 120 ℃ to 140 ℃, and the curing time of the corrosion-resistant layer is not more than 4.5min; or the coating is a water-based bi-component coating, the curing temperature is 120-140 ℃, and the curing time of the corrosion-resistant layer is not more than 4.5min.
  17. 17. Use of a coating according to any of claims 1 to 14 in a heat exchanger, wherein the coating is applied to an indoor heat exchanger and/or an outdoor heat exchanger of an air conditioner.

Description

Coating, preparation method and application Technical Field The invention relates to the technical field of anti-corrosion materials, in particular to a coating, a preparation method and application. Background The evaporation heat exchanger and the condensation heat exchanger of the air conditioner have important functions on reducing energy consumption of the air conditioner. At present, the mainstream heat exchanger is of a tube fin structure, a large-area radiating fin is wrapped by a refrigerant pipeline of a main body structure, a U-shaped pipe and a semicircular pipe of the refrigerant pipeline at two sides of the main body structure are exposed, and are extremely easily corroded by corrosive substances in the environment in the use process, so that refrigerant leakage occurs, and the refrigeration effect is reduced. Disclosure of Invention The invention mainly aims to develop a coating which is specially applied to the U-shaped pipe and the semicircular pipe in the refrigerant pipeline of the heat exchanger, has excellent heat conduction performance while considering corrosion resistance and weather resistance, and finally realizes the great improvement of the reliability, service life and energy-saving long-acting performance of the air conditioner synchronously. In order to achieve the aim, the invention provides a coating, which comprises a corrosion-resistant layer, wherein the corrosion-resistant layer is arranged on the surface of a metal part of a heat transfer pipe of a heat exchanger, the metal part is coated with fins, the coating for forming the corrosion-resistant layer comprises lamellar fillers with the mass percent of 0.2-4wt%, and the dry film thickness of the corrosion-resistant layer is 7-20 mu m. In one embodiment, the coating for forming the corrosion-resistant layer comprises 0.2-2 wt% of lamellar filler. In one embodiment, the corrosion-resistant layer comprises 1-10 layers of lamellar filler in the thickness direction, and/or the lamellar filler has a lamellar diameter of 1-10 μm. In one embodiment, the lamellar filler comprises at least one of graphene-based nanoplatelets, nanoplatelet silicates, nanoplatelet phosphates, nanoplatelet sulfides, nanoplatelet oxides, nanoplatelet nitrides. In one embodiment, the finless clad metal part of the heat transfer tube of the heat exchanger comprises at least one of a round tube, an internally threaded tube, an oval tube, a straight toothed tube, a semicircular tube, and a U-shaped tube. In one embodiment, the fins comprise at least one of flat plates, bridge plates, corrugated plates, slotted plates, and vortex guide fins. In one embodiment, the metal member is made of any one selected from aluminum alloy, copper alloy and stainless steel. In one embodiment, the coating for forming the corrosion-resistant layer includes an aqueous resin and a curing agent. In one embodiment, the coating is an aqueous single-component coating, and comprises 20-35 wt% of aqueous resin and 10-20 wt% of curing agent. In a specific embodiment, the aqueous single-component coating material comprises at least one of epoxy modified acrylic resin, aqueous fluorocarbon resin, aqueous polyester resin, aqueous silicone resin, polyurethane resin, and polyamide resin. In one embodiment, the coating is an aqueous two-component coating comprising a main component and a curing agent component in a weight ratio of 5-9:1. In one embodiment, the main component includes an epoxy resin and an epoxy modified resin. In one embodiment, the main component comprises 30-40 wt% of epoxy resin and 30-50 wt% of epoxy modified resin. In a specific embodiment, the epoxy resin comprises at least one of bisphenol A type epoxy resin, bisphenol F type epoxy resin, polyurethane modified epoxy resin, cycloaliphatic epoxy resin, and multifunctional epoxy resin, and/or the epoxy modified resin comprises at least one of epoxy modified silicone resin, epoxy modified acrylic resin, epoxy modified phenolic resin. In one embodiment, the curative component includes a polyamide curative and a phenolic ammonia curative. In a specific embodiment, the curing agent component comprises 40-70 wt% of polyamide curing agent and 1-20 wt% of phenolic ammonia curing agent. The invention also provides a preparation method of the coating, which comprises the following steps: S1, preparing a coating by using lamellar fillers; s2, coating the coating prepared in the step S1 on the surface of the metal part, curing to form a corrosion-resistant layer, and completing the preparation of the coating. In an embodiment, in the step S2, the coating is an aqueous single-component coating with a curing temperature of 120 ℃ to 140 ℃ and a curing time of the corrosion-resistant layer not more than 4.5min, or the coating is an aqueous two-component coating, the main component and the curing agent component are mixed and coated on the surface of the metal part, the curing temperature is 120 ℃ to 140 ℃, and the curing time of t