CN-121991573-A - Long-life weather-resistant heavy-duty anticorrosive graphene coating and preparation method thereof

CN121991573ACN 121991573 ACN121991573 ACN 121991573ACN-121991573-A

Abstract

The invention discloses a long-life weather-resistant heavy-duty anticorrosive graphene coating and a preparation method thereof, wherein the long-life weather-resistant heavy-duty anticorrosive graphene coating comprises, by mass, 100 parts of (10-15) a component A and a component B, the component A comprises, by mass, 30-45% of bisphenol F epoxy resin, 3-8% of an aminated graphene dispersion liquid, 15-25% of flaky zinc powder, 10-20% of mica iron oxide, 3-8% of sericite powder, 0.5-1.5% of a dispersing agent, 0.2-0.8% of a defoaming agent, 0.3-1.0% of a leveling agent, 10-20% of a mixed solvent, and the component B is a polyamide curing agent. The invention adopts a synergistic protection strategy of 'proper zinc powder cathodic protection + flake filler/graphene physical shielding + chemical functional modification', and ensures that the anticorrosive graphene coating shows excellent anticorrosive performance in harsh environments such as ocean atmosphere, splash zone, full immersion zone and the like.

Inventors

NIU JIANMIN
SHENG NAN
YU WENJUAN
SHI YUZE
PENG LIJUN
YIN WENJIE
LIU TAO
ZHANG RUIPENG

Assignees

上海船舶工艺研究所(中国船舶集团有限公司第十一研究所)

Dates

Publication Date: 20260508
Application Date: 20251223

Claims (11)

1. The weather-resistant heavy-duty anticorrosive graphene coating with the long service life is characterized by comprising, by mass, 100 (10-15) of a component A and a component B, wherein the component A comprises, by mass, 30-45% of bisphenol F epoxy resin, 3-8% of an aminated graphene dispersion liquid, 15-25% of flaky zinc powder, 10-20% of mica iron oxide, 3-8% of sericite powder, 0.5-1.5% of a dispersing agent, 0.2-0.8% of a defoaming agent, 0.3-1.0% of a leveling agent, 10-20% of a mixed solvent, and the component B is a polyamide curing agent; the dispersion liquid of the amino graphene is prepared by modifying a silane coupling agent, wherein the mass content of the amino graphene is 0.5% -5%, the sheet diameter of the graphene is 5-15 mu m, the number of layers is 1-5, and the mass ratio of amino functional groups in the amino graphene is 0.5-1.5at%.
2. The long-life weather-resistant heavy-duty graphene coating of claim 1, wherein the bisphenol F epoxy resin is prepared by reacting phenol with formaldehyde under acid catalysis to generate bisphenol F and then performing polycondensation reaction with epichlorohydrin in the presence of sodium hydroxide, and has an epoxy value of 0.15-0.25 eq/100g and a viscosity of 2000-700 cps at 25 ℃.
3. The long-life weather-resistant heavy-duty graphene coating according to claim 1, wherein the scaly zinc powder has a diameter-thickness ratio of >40:1, a granularity of 200-800 meshes and a purity of 99.9% or more.
4. The long-life weather-resistant heavy-duty graphene coating of claim 1, wherein the mica iron oxide has a lamellar structure and a particle size distribution of 10-50 μm.
5. The long-life weather-resistant heavy-duty graphene coating of claim 1, wherein the sericite powder is fine-scale fine-grained muscovite with a diameter-thickness ratio of >80 and a granularity of 200-2000 meshes.
6. The long-life weather-resistant heavy-duty anticorrosive graphene coating according to claim 1 is characterized in that the dispersing agent is a high-molecular block copolymer containing an anchoring group, the defoaming agent is an organosilicon defoaming agent, the leveling agent is an organosilicon surfactant, and the mixed solvent is a compound of propylene glycol methyl ether acetate and No. 150 solvent oil according to a mass ratio of 1:1-1:2.
7. The long-life weatherable heavy duty graphene coating of claim 1, wherein the polyamide curing agent is a modified polyamide curing agent having an amine value of 280-350 mg KOH/g and a viscosity of 2000-3500mpa-s at 25 ℃.
8. The preparation method of the long-life weather-resistant heavy-duty anticorrosive graphene coating according to any one of claims 1 to 7, which is characterized by comprising the following preparation steps of component A: (1) Adding the phenolic aldehyde modified epoxy resin into the mixed solvent with a dissolving amount, adding the dispersing agent, the defoaming agent and the leveling agent, and uniformly stirring and mixing; (2) Sequentially adding the scaly zinc powder, the mica iron oxide and the sericite powder, and uniformly stirring and mixing; (3) Adding the amination graphene dispersion liquid, and stirring until graphene is uniformly dispersed without agglomeration; (4) And (5) regulating the viscosity to be 60-90 s in a coating-4 cup by using the residual mixed solvent, and filtering to obtain the component A.
9. The preparation method of the long-life weather-resistant heavy-duty anticorrosive graphene coating according to claim 8 is characterized in that the step (1) is stirring at a rotation speed of 400-600 r/min for 10-15 min to uniformly mix raw materials, the step (2) is stirring at a rotation speed of 800-1200 r/min for 20-30 min to uniformly mix the raw materials, and the step (3) is stirring at a rotation speed of 600-800 r/min for 30-45 min.
10. The preparation method of the long-life weather-proof heavy-duty anticorrosive graphene coating according to claim 1, wherein in the step (3), a disc type dispersing disc is adopted for stirring and dispersing, the linear speed of the dispersing disc is 10-15 m/s, and the system temperature in the dispersing process is controlled below 40 ℃.
11. The application of the long-life weather-resistant heavy-duty anticorrosive graphene coating according to any one of claims 1-7 in protecting ships, ocean platforms, port facilities and coastal bridge steel structures.

Description

Long-life weather-resistant heavy-duty anticorrosive graphene coating and preparation method thereof Technical Field The invention belongs to the field of marine anti-corrosion coating, and particularly relates to a long-life weather-resistant heavy-duty anti-corrosion graphene coating and a preparation method thereof. Background The high-salt, high-humidity and ultraviolet irradiation of the marine environment and the microbial characteristics are extremely serious to corrosion of steel structure facilities such as marine ships, ocean platforms, port facilities, coastal bridge steel structures and the like working in the marine environment. The traditional heavy anti-corrosion paint, such as zinc-rich primer and epoxy iron-cloud intermediate paint, has the bottleneck that 1) zinc powder content is high, zinc fog is easy to generate during welding and cutting, health is damaged, strategic resources are consumed, 2) capillary channels are easy to generate in the coating, the protective life is limited due to medium permeation, and the heavy anti-corrosion paint must be overhauled usually for 3-5 years, 3) weather resistance is insufficient, intermediate paint and primer are rapidly invalid after powdering and light losing of the finish paint, and 4) VOC content is high, and environmental protection pressure is high. Graphene is considered as the core of the next generation of anti-corrosion materials due to its unique two-dimensional lamellar structure, excellent chemical inertness, high aspect ratio and excellent electrical conductivity. However, graphene is easy to agglomerate in a resin matrix, has poor dispersion stability, and has weak bonding force with a matrix interface, so that the application effect of the graphene is limited. In the prior art, the paint with graphene purely physically blended often cannot fully exert the performance, and the long-acting anti-corrosion effect is improved only to a limited extent. The patent document CN113717610A discloses a nano titanium modified flake zinc powder anticorrosive paint and a preparation method thereof, wherein the nano titanium modified flake zinc powder anticorrosive paint comprises 30-65 parts of epoxy resin, 20-50 parts of flake zinc powder, 3-8 parts of organic bentonite, 3-12 parts of gamma-aminopropyl triethoxysilane, 1-5 parts of nano titanium, 5-10 parts of nano titanium dioxide, 5-15 parts of fluorocarbon emulsion, 8-20 parts of amine curing agent and 10-50 parts of solvent, and the epoxy resin is one or more than two of bisphenol F epoxy resin, hydrogenated bisphenol A epoxy resin, methylol bisphenol A epoxy resin, bromine modified diphenol propane epoxy resin and graphene modified epoxy resin. According to the method, the nano titanium and the flake zinc powder are added, so that the corrosion resistance and mechanical property of the paint are effectively improved, meanwhile, the conductivity of the flake zinc powder coating can be increased, and the electrochemical corrosion resistance effect of a paint film is further improved. However, the document also has the problems of dispersion stability of nano titanium powder, consumption and service life limitation of flake zinc powder, efficiency and uniformity of electrochemical protection and the like, and has the defects of high process compatibility, high mechanical property of coating, high cost of raw materials and the like in large-scale production. Disclosure of Invention The invention aims to provide a long-life weather-resistant heavy-duty anticorrosive graphene coating and a preparation method thereof, and aims to overcome the defects of short service life, poor environmental protection and low graphene utilization efficiency of the existing heavy-duty anticorrosive coating by realizing ultra-long service life, high adhesive force and low VOC through graphene functional modification and filler collaborative design. In order to achieve the above object, the present invention has the following technical scheme. The long-life weather-resistant heavy-duty anticorrosive graphene coating comprises, by mass, 100 (10-15) of a component A and a component B, wherein the component A comprises, by mass, 30-45% of bisphenol F epoxy resin, 3-8% of an aminated graphene dispersion liquid, 15-25% of flaky zinc powder, 10-20% of mica iron oxide, 3-8% of sericite powder, 0.5-1.5% of a dispersing agent, 0.2-0.8% of a defoaming agent, 0.3-1.0% of a leveling agent, 10-20% of a mixed solvent, and the component B is a polyamide curing agent; The dispersion liquid of the amino graphene is prepared by modifying a silane coupling agent, wherein the mass content of the amino graphene is 0.5% -5%, the lamellar diameter of the graphene is 5-15 mu m, the number of layers is 1-5, the mass ratio of amino functional groups in the amino graphene is 0.5-1.5at%, for example, MZ-GO-NH 2 of Ningbo-Mexico technology and SE1432-NH 2 of a sixth element in Changzhou are adopted, and the dispersion stability of the amino gra