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CN-122011889-A - Outdoor high-performance anti-corrosion wear-resistant coating and preparation method thereof

CN122011889ACN 122011889 ACN122011889 ACN 122011889ACN-122011889-A

Abstract

The invention discloses an outdoor high-performance anti-corrosion wear-resistant coating and a preparation method thereof, and belongs to the technical field of protective coatings. The coating is prepared by taking aqueous epoxy resin emulsion and aqueous polyurethane dispersoid as film forming base materials, matching graphene oxide, flaky mica powder and modified nano silicon dioxide as functional fillers, taking sodium chloride microspheres coated with corrosion inhibitors on the surfaces and microencapsulated solid lubricants as pore-forming and self-repairing components, and matching aqueous epoxy curing agents and auxiliary agents. The coating has excellent corrosion resistance and wear resistance and an intelligent self-repairing function, is resistant to neutral salt fog for more than 1500 hours, has extremely low VOC content, can be cured at room temperature or low temperature, is simple and convenient to construct, is suitable for protecting outdoor scientific and teaching equipment, recreation facilities and the like, and can be expanded to the fields of high-end equipment such as ships and ocean engineering.

Inventors

  • HAO ZIQIANG

Assignees

  • 江苏金阳光科教设备集团有限公司

Dates

Publication Date
20260512
Application Date
20260325

Claims (10)

  1. 1. The outdoor high-performance anti-corrosion wear-resistant coating comprises a film-forming resin base material, a functional filler, an auxiliary agent and a curing agent, and is characterized by further comprising core pore-forming and repairing components, wherein the raw materials comprise, by weight: Film forming resin base material, namely 30-50 parts of aqueous epoxy resin emulsion and 10-20 parts of aqueous polyurethane dispersoid; 0.5-2 parts of graphene oxide, 5-10 parts of flaky mica powder and 3-8 parts of modified nano silicon dioxide; The core pore-forming and repairing component comprises 5-15 parts of sodium chloride microsphere with a surface coated corrosion inhibitor and 3-10 parts of microencapsulated solid lubricant, wherein the sodium chloride microsphere with the surface coated corrosion inhibitor takes sodium chloride as an inner core, the surface of the inner core is coated with a zinc stearate hydrophobic isolation layer, and the surface of the zinc stearate hydrophobic isolation layer is loaded with the corrosion inhibitor; 0.5-1.5 parts of wetting dispersant, 0.1-0.5 part of defoamer, 0.2-0.8 part of flatting agent and pH regulator, wherein the dosage of the pH regulator is the amount for regulating the pH value of a system to 8.0-9.0; the curing agent is a waterborne epoxy curing agent, the addition amount of the waterborne epoxy curing agent is matched with the epoxy equivalent of the waterborne epoxy resin emulsion, and the corresponding weight part is 8-15 parts.
  2. 2. The outdoor high performance corrosion and wear resistant coating of claim 1, wherein the corrosion inhibitor is sodium molybdate or benzotriazole.
  3. 3. The outdoor high-performance anti-corrosion wear-resistant coating according to claim 1, wherein the microencapsulated solid lubricant is prepared by an in-situ polymerization method or a complex coacervation method by taking polyurea or gelatin-acacia as a wall material and molybdenum disulfide or graphite powder as a core material.
  4. 4. The outdoor high-performance corrosion-resistant wear-resistant coating according to claim 1, wherein the modified nano-silica is a nano-silica surface hydrophobically modified by a silane coupling agent, and the particle size is 20-100nm.
  5. 5. The outdoor high-performance corrosion-resistant wear-resistant coating according to claim 1, wherein the aqueous epoxy resin emulsion has a solid content of 48% -52% and an epoxy equivalent of 190-210g/eq, and the aqueous polyurethane dispersion has a solid content of 33% -37%.
  6. 6. The outdoor high-performance corrosion-resistant wear-resistant coating according to claim 1, wherein the particle size of the sodium chloride microspheres coated with the corrosion inhibitor is 30-100 μm, and the particle size of the microencapsulated solid lubricant is 10-50 μm.
  7. 7. A method for preparing an outdoor high-performance anti-corrosion wear-resistant coating according to any one of claims 1 to 6, which comprises the following steps: s1, premixing, namely sequentially adding wetting dispersant, defoamer and 1/2 formula amount of flatting agent into deionized water in a stirring state, and uniformly stirring to obtain premix; S2, filler dispersion, namely slowly adding graphene oxide, flaky mica powder and modified nano silicon dioxide into the premix obtained in the step S1, and dispersing at a high speed until the fineness of the system is less than or equal to 30 mu m to obtain filler dispersion; s3, resin mixing, namely reducing the stirring rotation speed to below 300rpm, sequentially adding the aqueous epoxy resin emulsion and the aqueous polyurethane dispersion into the filler dispersion liquid obtained in the step S2, and uniformly stirring to obtain resin-based feed liquid; S4, adding functional components, namely adding sodium chloride microspheres and microencapsulated solid lubricants with corrosion inhibitors coated on the surfaces into the resin-based feed liquid obtained in the step S3, stirring at a rotating speed of 100-300rpm until the mixture is uniformly dispersed, and avoiding high-speed shearing to damage coating/capsule wall structures of the components; S5, paint adjustment, namely adjusting the pH value of the system to 8.0-9.0 by using a pH regulator, adding the rest leveling agent, and uniformly stirring to obtain a paint base material; And S6, curing and constructing, namely adding an aqueous epoxy curing agent into the coating base material obtained in the step S5 before using, uniformly stirring, curing for 20-30 minutes, constructing on the pretreated base material, and curing at room temperature or below 80 ℃ to form a film.
  8. 8. The method according to claim 7, wherein in the step S6, the construction method is spraying or brushing, the base material is a metal base material which is processed to Sa2.5 grade through sand blasting, and the dry film thickness of the cured coating is controlled to be 100-200 μm.
  9. 9. Use of the outdoor high-performance corrosion-resistant wear-resistant coating as claimed in any one of claims 1 to 6 for long-lasting protection of metal surfaces of outdoor scientific and educational equipment, amusement facilities, sports equipment.
  10. 10. Use of the outdoor high-performance corrosion-resistant wear-resistant coating as claimed in any one of claims 1 to 6 for long-acting protection of metal surfaces of ships, high-speed rails and marine engineering equipment.

Description

Outdoor high-performance anti-corrosion wear-resistant coating and preparation method thereof Technical Field The invention relates to the technical field of protective coating, in particular to an aqueous outdoor high-performance anti-corrosion wear-resistant coating with an intelligent self-repairing function and a preparation method thereof. Background With the rapid development of science and education travel, sports industry and high-end equipment manufacturing industry, the usage amount of metal structural parts such as outdoor science and education equipment, recreation facilities, sports equipment, ships, high-speed rail, ocean engineering equipment and the like is increased year by year. The facilities are exposed to outdoor complex environments for a long time, and continuously face multiple tests of sun and rain, temperature change circulation, medium corrosion, mechanical friction and impact, so that extremely high requirements are put on the comprehensive performance of the surface protective coating. At present, solvent type anti-corrosion paint or common water-based outdoor paint is generally adopted for protecting the outdoor metal facilities, and the paint has the defects of large VOC emission, poor environmental friendliness, insufficient weather resistance, easiness in pulverization and falling and poor wear resistance and scratch resistance. The coating is easy to generate microcracks and abrasion in the service process, so that the protective performance is fast invalid, the maintenance period and the operation and maintenance cost of facilities are greatly improved, and the corrosion of the base material can be possibly caused by the invalid coating, so that serious potential safety hazards are brought. In the field of high-end equipment such as ships, ocean engineering, rail transit and the like, professional heavy-duty protective coating is applied, but the coating generally has the problems of high raw material cost and complex construction process, and often needs a plurality of special construction conditions such as coating, high-temperature curing and the like, so that the coating is difficult to adapt to the field construction requirements of large-scale outdoor facilities and complex structural members. Meanwhile, the existing high-end heavy-duty anticorrosive paint mostly takes the improvement of the compactness of the coating as a core protection thought, has the defects of large internal stress and easiness in cracking, has single function, generally lacks self-repairing capability for micro-damage of the coating, and can quickly permeate corrosive media to the surface of a substrate once the coating is subjected to microcrack and scratch, so that local corrosion is caused, and the maintenance pressure of long-term service is extremely high. In the prior art, aiming at the research and development of the self-repairing function of the coating, the design of single corrosion inhibitor microcapsules is concentrated, only the passive inhibition of the corrosion process can be realized, the repairing of the wear resistance of the coating after abrasion cannot be considered, and the double test of corrosion and friction of outdoor facilities is difficult to meet. Meanwhile, in the existing anticorrosive coating system, soluble chloride salt such as sodium chloride and the like is used as harmful impurities to be strictly controlled, and the reason is that chloride ions have extremely strong penetrability, easily damage a passivation film on the surface of a metal substrate, initiate pitting corrosion and accelerated corrosion, no mature scheme for converting the chloride salt into an intelligent functional unit of an anticorrosive coating is available in the prior art, and the low-cost synergy of the protective performance and the self-repairing function of the coating is difficult to realize. Therefore, developing an outdoor high-performance protective coating which has excellent corrosion resistance, wear resistance and intelligent self-repairing function, is environment-friendly, simple and convenient to construct and moderate in cost becomes a technical problem to be solved in the field. Disclosure of Invention In view of the above, the invention provides an outdoor high-performance anti-corrosion wear-resistant coating and a preparation method thereof, which aim to overcome the defects that the existing outdoor protective coating is insufficient in anti-corrosion wear-resistant performance, has no long-acting self-repairing capability, cannot be considered in terms of environmental friendliness and construction convenience, and is difficult to balance comprehensive protective performance and cost, realize the integrated synergy of the anti-corrosion, wear-resistant and self-repairing functions of the coating, and simultaneously meet the full-scene protection requirements from civil conventional outdoor facilities to high-end engineering equipment. The technical scheme of th