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CN-122011916-A - Salt mist-resistant high-temperature-resistant friction-resistant coating as well as preparation method and application thereof

CN122011916ACN 122011916 ACN122011916 ACN 122011916ACN-122011916-A

Abstract

The invention provides a salt mist-resistant high-temperature-resistant friction-resistant coating as well as a preparation method and application thereof. The coating comprises 75-88 parts by weight of mineral oil, 2-8 parts by weight of antirust additive, 0.1-0.5 part by weight of antioxidant additive, 0.8-4.4 parts by weight of drier, 8-18 parts by weight of solid lubricating additive, 22-35 parts by weight of film-forming resin, 15-18 parts by weight of flaky metallic pigment and 4-14 parts by weight of solvent, wherein the mineral oil is selected from a mixture of dearomatized solvent oil, hydrogenated base oil and propylene glycol methyl ether acetate, the solid lubricating additive is selected from at least one of graphene or PEEK powder, the film-forming resin is selected from polyurethane resin, and the flaky metallic pigment is selected from non-floating neutral aluminum silver paste. The coating system provided by the invention is simple, the disc reed base material is not required to be subjected to pretreatment such as electroplating, an effective protective layer can be formed through a simple coating process, the salt spray corrosion resistance, the high temperature resistance and the friction resistance of the semi-open flexible crimping IGBT device are obviously improved, and the long-term use reliability of the device is improved.

Inventors

  • XU ZEHUA
  • AN DI
  • LI XINGFENG
  • SHI HAOWEN
  • SHI TINGCHANG
  • QIN RONGZHEN
  • CHANG GUIQIN

Assignees

  • 株洲中车时代半导体股份有限公司

Dates

Publication Date
20260512
Application Date
20260114

Claims (10)

  1. 1. An anti-salt spray high temperature resistant friction resistant coating, comprising: 75-88 parts by weight of mineral oil, 2-8 parts by weight of an anti-rust additive, 0.1-0.5 part by weight of an anti-oxidation additive, 0.8-4.4 parts by weight of a drier, 6-8 parts by weight of a solid lubricating additive, 35-42 parts by weight of a film-forming resin, 5-8 parts by weight of a flaky metallic pigment, 5-14 parts by weight of a true solvent and 5-14 parts by weight of a diluent; The mineral oil is selected from a mixture of dearomatized solvent oil, hydrogenated base oil and propylene glycol methyl ether acetate; the solid lubricating additive is at least one of graphene or PEEK powder; The film-forming resin is selected from polyurethane resins; the flaky metallic pigment is selected from non-floating neutral aluminum silver paste.
  2. 2. The coating according to claim 1, wherein the mass ratio of the dearomatized solvent oil, the hydrogenated base oil and the propylene glycol methyl ether acetate is (10-12): 1-3): 5-8; and/or the dearomatized solvent oil is selected from aliphatic hydrocarbon solvents with a distillation range of 160 ℃ to 250 ℃; and/or the hydrogenated base oil has a kinematic viscosity at 40 ℃ of 15 to 50 cSt.
  3. 3. The coating according to claim 1, wherein the rust inhibitive additive is selected from the group consisting of a mixture of sulfonate, alkenyl succinic acid and sulfonated castor oil, preferably the mass ratio of sulfonate, alkenyl succinic acid and sulfonated castor oil is (8-15): 1-3): 3-8.
  4. 4. A coating according to any one of claims 1-3, characterized in that the drier is selected from a mixture of manganese, calcium and zirconium, preferably the mass ratio of the zirconium, the calcium and the manganese is (5-15): 2-8): 1-5.
  5. 5. A coating according to any one of claims 1 to 3, wherein the antioxidant additive is selected from the group consisting of a mixture of 2, 6-di-tert-butyl-p-cresol and tris (nonylphenyl) phosphite, preferably the mass ratio of 2, 6-di-tert-butyl-p-cresol to tris (nonylphenyl) phosphite is (2-5): 1-3; and/or the polyurethane resin has a hydroxyl number of 50 to 150 mg KOH/g, preferably 80 to 120 mg KOH/g.
  6. 6. A coating according to any one of claims 1-3, characterized in that the flake metal of the flake metal pigment has a D 50 of 10 μm-25 μm, preferably 15 μm to 20 μm; And/or the pH value of the flaky metallic pigment is 6-8.
  7. 7. A coating according to any one of claims 1 to 3, wherein the true solvent is selected from ethyl acetate; and/or the diluent is selected from butyl acetate.
  8. 8. A method for preparing the salt spray resistant, high temperature resistant and abrasion resistant coating according to any one of claims 1 to 7, comprising the steps of: (1) Uniformly stirring propylene glycol methyl ether acetate and dearomatized solvent oil, heating, adding an antioxidant additive and an antirust additive, completely dissolving, adding hydrogenated base oil, cooling to room temperature, adding a drier, uniformly dispersing, and filtering to obtain a component A; (2) Adding ethyl acetate and butyl acetate into polyurethane resin under stirring, stirring until the polyurethane resin is completely transparent, adding a solid lubricating additive and a flaky metallic pigment, and stirring for at least 30min after the addition is finished to obtain a component B; (3) Mixing and stirring the component A and the component B, curing and standing; Preferably, the heating in step (1) is to a temperature of 50 ℃ or less, preferably 40-50 ℃; Preferably, the aging and standing time is not less than 20 minutes.
  9. 9. Use of the salt spray resistant high temperature resistant friction resistant coating of any one of claims 1 to 7 in a semiconductor device, preferably a dished reed of a semi-open crimp IGBT device.
  10. 10. The application according to claim 9, wherein the process of applying the coating to the disc reed comprises immersing the disc reed in the coating for 8-12min, taking out, spin-drying, and drying after 1-2 min; Preferably, the rotating speed of a spin dryer used for spin-drying is 800-1000r/min; Preferably, the drying is divided into 4 stages, the temperature of each stage is 40 ℃,60 ℃,80 ℃ and 100 ℃ respectively according to time sequence, and the heat preservation time of each stage is 2-4h.

Description

Salt mist-resistant high-temperature-resistant friction-resistant coating as well as preparation method and application thereof Technical Field The invention belongs to the technical field of coatings, and particularly provides a salt mist-resistant high-temperature-resistant friction-resistant coating as well as a preparation method and application thereof. Background The offshore wind power base starts large-scale planning and construction, a load center is an extra-high voltage power transmission and long-distance flexible direct current power transmission engineering network (VSC-HVDC) constructed by efficiently conveying western clean energy and open-sea wind power to the east middle part, a sea cable login end and a shore-based converter station are both concentrated in the eastern coastal zone, key electric facilities are exposed to severe environments with high humidity and high salt for a long time, irreversible corrosion is caused on precise semiconductor devices in power electronic equipment, and the transmission safety and long-term reliability of the power grid are seriously affected. Therefore, the crimping IGBT power semiconductor serving as the core power device of the converter and the converter valve can resist long-term corrosion of salt spray environment, and is a bottom hardware foundation stone and a necessary choice for supporting energy safety and guaranteeing stable operation of the whole life cycle of major engineering. For a semi-open flexible crimping IGBT power semiconductor device, a disc spring and a power component thereof are used as core components for balancing mechanical pressure, and the rust resistance is directly related to the long-term reliability and the service safety of the whole module. The disc reed generally uses high-performance disc reed steel as a base material, and is easy to rust and corrode in a salt fog environment for a long time, on one hand, rust and corrosion products can cause elastic characteristics of the disc reed, pressure relaxation or uneven pressure can be caused, so that chip contact resistance and internal heat management are increased, on the other hand, rust and corrosion objects fall on other positions in a module, electrical insulation failure can be caused, and corrosion of metal parts at the falling position is continuously promoted. Therefore, the protection of the disc spring and the power components thereof from the rust-preventive treatment is important. The existing paint can not meet the special requirements of the special environment of the disc spring, so that the paint suitable for the disc spring needs to be improved. Disclosure of Invention The present invention aims to solve at least to some extent one of the technical problems in the prior art. Therefore, the invention aims to provide a salt mist-resistant high-temperature-resistant friction-resistant coating as well as a preparation method and application thereof, thereby meeting the special requirements of a semiconductor device disc spring. Under a complex environment, corrosions are easy to invade from gaps between the shell and the sub-assembly and between the shell and the grid PCB, and as a core component for pressure regulation, a dish reed used by the main circuit elastic force application unit is extremely easy to corrode to generate corrosion, so that the pressure stability is influenced, and corrosion fragments are easy to cause the failure of the device. In view of this, the present invention proposes a salt mist-resistant, high temperature-resistant, abrasion-resistant coating comprising: 75-88 parts by weight of mineral oil, 2-8 parts by weight of an anti-rust additive, 0.1-0.5 part by weight of an anti-oxidation additive, 0.8-4.4 parts by weight of a drier, 6-8 parts by weight of a solid lubricating additive, 35-42 parts by weight of a film-forming resin, 5-8 parts by weight of a flaky metallic pigment, 5-14 parts by weight of a true solvent and 5-14 parts by weight of a diluent; The mineral oil is selected from a mixture of dearomatized solvent oil, hydrogenated base oil and propylene glycol methyl ether acetate; the solid lubricating additive is at least one of graphene or PEEK powder; The film-forming resin is selected from polyurethane resins; the flaky metallic pigment is selected from non-floating neutral aluminum silver paste. According to the salt mist-resistant high-temperature-resistant friction-resistant coating provided by the invention, the synergistic compounding effect of the components is fully volatilized through the selection of specific raw materials of the components and the mass fraction adjustment of the components, so that the performance of the coating is obviously improved. The corrosion resistance of the flexible crimping IGBT power semiconductor device in strong corrosion scenes such as marine environment is improved, particularly the rust resistance of the disc spring assembly with low corrosion resistance is improved, and the c