A surface treatment-free heavy-duty anticorrosive coating and a preparation method thereof
The surface-treatment-free ultra-heavyweight anti-corrosion coating solves the problem of underwater and humid environment construction of heavy-duty anti-corrosion coatings by utilizing chemical bonding and electrochemical synergistic conversion mechanism. It achieves strong chemical bonding and long-term anti-corrosion on smooth, rusty and damp surfaces, adapts to complex environments, has flame-retardant properties, and meets drinking water safety requirements.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- BEIJING BENBEN INT NEW MATERIAL TECH CO LTD
- Filing Date
- 2026-05-08
- Publication Date
- 2026-06-09
AI Technical Summary
Existing heavy-duty anti-corrosion coatings require surface pretreatment such as sandblasting, grinding, or phosphating before application, which limits their application in special environments such as underwater and humid environments. Furthermore, they cannot simultaneously meet multiple application requirements such as ultra-long-lasting anti-corrosion, multi-environment adaptability, rust-resistant coating, and flame retardancy.
The ultra-heavyweight anti-corrosion coating, composed of components A, B, and C, achieves surface-free operation through a triple interface reaction mechanism of chemical bonding, electrochemical synergistic transformation, and penetration curing. It combines hyperbranched polysiloxane-phosphate-catechol terpolymer, polyaniline/polypyrrole/graphene oxide/molybdate quaternary hybrid material, and modified mercaptoacetate to form a strong chemical bonding interface and a labyrinthine physical barrier layer, making it suitable for smooth, rusty, and damp surfaces, and providing long-lasting anti-corrosion and flame-retardant properties.
It achieves excellent adhesion, corrosion resistance and flame retardancy in a variety of substrates and complex environments without the need for sandblasting, grinding or phosphating, meets the safety requirements for underwater construction and drinking water, broadens the application temperature range, and is suitable for a variety of extreme environments.
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Abstract
Claims
1. A surface-treatment-free, ultra-heavyweight anti-corrosion coating, characterized in that, It is composed of component A, component B and component C, wherein the mass ratio of component A, component B and component C is 100:(30-40):(5-8); Component A, by mass, comprises: 15-20 parts of hydrogenated bisphenol A type epoxy resin, 10-15 parts of polyaspartic acid ester resin, 6-10 parts of hyperbranched polysiloxane-phosphate-catechol terpolymer, 4-7 parts of polyaniline / polypyrrole / graphene oxide / molybdate quaternary hybrid material, 0.5-1 part of graphene nanosheets, 3-5 parts of nano zinc oxide, and 2-3 parts of fumed silica. Component B, by weight, comprises: 40-50 parts of polyetheramine, 20-30 parts of alicyclic amine, 10-15 parts of modified thioglycolic acid ester, 5-8 parts of melamine polyphosphate, and 5-10 parts of aluminum hydroxide. The C component, by mass, comprises: 0.5 to 1 part of fluorocarbon surfactant, 0.3 to 0.5 part of polyether-modified polysiloxane defoamer, and 0.5 to 1 part of isothiazolinone derivative.
2. The heavy-duty anti-corrosion coating according to claim 1, characterized in that, The polyetheramine is polyoxypropylene diamine with a number average molecular weight of 2000.
3. The heavy-duty anti-corrosion coating according to claim 1, characterized in that, The modified thioglycolate is a hydroxyethyl methacrylate-modified thioglycolate, which is prepared by transesterification of thioglycolate and hydroxyethyl methacrylate. It has a number average molecular weight of 300-500 and contains thiol, ester and acrylate double bonds in its molecular structure. The thiol content is 8-10 wt%.
4. A method for preparing the ultra-heavyweight anti-corrosion coating according to any one of claims 1 to 3, characterized in that, Includes the following steps: Step (1): Synthesize hyperbranched polysiloxane-phosphate-catechin terpolymer for later use; Step (2): Prepare polyaniline / polypyrrole / graphene oxide / molybdate quaternary hybrid materials by in-situ oxidative polymerization for later use; Step (3): The terpolymer obtained in step (1) is stirred and pre-dispersed with hydrogenated bisphenol A epoxy resin, polyaspartic acid ester resin, graphene nanosheets, nano zinc oxide, and fumed silica. The quaternary hybrid material obtained in step (2) is added and ultrasonically dispersed evenly. Vacuum degassing is performed to obtain component A. The raw materials of component B are mixed evenly to obtain component B. The raw materials of component C are mixed evenly to obtain component C. Before use, components A, B, and C are mixed at a mass ratio of 100:(30-40):(5-8) to obtain the ultra-heavy anti-corrosion coating.
5. The preparation method according to claim 4, characterized in that, Step (1) specifically involves dissolving hyperbranched polysiloxane with a molecular weight of 1500–2500 and an amino content of 1.0–1.5 mmol / g in anhydrous N,N-dimethylformamide under nitrogen protection. A condensation reaction is then carried out using EDC / NHS as a catalyst, with the mass ratio of hyperbranched polysiloxane to the carboxyphosphate monomer being (40–50):(25–35). Dopamine hydrochloride is then added, and the pH is adjusted to 8–9 with triethylamine. The reaction is carried out at 55–65°C for 4–8 hours, with the mass ratio of hyperbranched polysiloxane to dopamine hydrochloride being (40–50):(25–35). After dialysis purification and freeze-drying, the terpolymer is obtained.
6. The preparation method according to claim 4, characterized in that, Step (2) specifically involves: ultrasonically dispersing graphene oxide in a 1 mol / L hydrochloric acid solution, adding aniline monomer at a mass ratio of 2:1 to aniline oxide, and initiating polymerization by adding ammonium persulfate dropwise at 0–5°C, with a molar ratio of aniline to ammonium persulfate of 1:1, and reacting for 4–8 hours; then adding pyrrole monomer at a molar ratio of pyrrole to aniline of (0.3–0.7):1, and initiating polymerization by adding ferric chloride dropwise, with a molar ratio of pyrrole to ferric chloride of 1:(2–3), and reacting for 1–3 hours at 0–5°C; adding molybdate corrosion inhibitor, with the amount of molybdate corrosion inhibitor added being 1.5–3% of the total mass of the obtained quaternary hybrid material, ultrasonically dispersing evenly, centrifuging and washing, and vacuum drying to obtain the quaternary hybrid material.
7. The preparation method according to claim 6, characterized in that, In step (2), while adding molybdate corrosion inhibitor, aminated boron nitride is also added, and the amount of aminated boron nitride added is 8 to 12% of the total mass of the obtained quaternary hybrid material.
8. The preparation method according to claim 4, characterized in that, In step (3), the stirring pre-dispersion speed is 1000-2000 rpm and the time is 20-40 min; the ultrasonic dispersion time is 20-40 min; the vacuum degree of vacuum degassing is -0.09--0.10 MPa and the time is 15-25 min.
9. A method for applying the heavy-duty anti-corrosion coating according to any one of claims 1 to 3, characterized in that, Without sandblasting, grinding, or phosphating, components A, B, and C are mixed in a mass ratio of 100:(30~40):(5~8) and directly coated onto the substrate surface. The thickness of a single wet film is 800~2000 μm. The coating is cured at -10~+50℃ to obtain an anti-corrosion coating.
10. The construction method according to claim 9, characterized in that, The substrate is selected from one or more of the following: a smooth metal or non-metal substrate with a surface roughness Ra≤0.02μm, a rusted metal substrate with a surface rust layer thickness not exceeding 100 μm, a damp substrate with a surface water film thickness not exceeding 500 μm, and an underwater substrate.