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CN-121160204-B - Water-based corrosion inhibition anticorrosive paint and preparation method thereof

CN121160204BCN 121160204 BCN121160204 BCN 121160204BCN-121160204-B

Abstract

The invention relates to the technical field of anti-corrosion paint, in particular to water-based corrosion inhibition anti-corrosion paint and a preparation method thereof. The zinc phosphate is independently used as a corrosion inhibition additive of the water-based anticorrosive paint, is easy to agglomerate and has poor compatibility with resin, and the water-based anticorrosive paint forms a protective coating on the metal surface, so that the corrosion resistance is poor and unstable. Aiming at the problems, the invention provides a water-based corrosion inhibition anticorrosive paint which consists of A, B components. The self-made composite corrosion inhibitor ZnP-PEG-IPTS-GO is added in the component A. The composite corrosion inhibitor is bridged by IPTS, and chemically bonds GO, PEG and zinc phosphate, so that the organic combination of physical shielding and active passivation is realized, and the comprehensive corrosion resistance of the coating is obviously improved.

Inventors

  • YIN LIPING
  • WU JING
  • LIU ZHIWEN

Assignees

  • 常州光辉化工有限公司

Dates

Publication Date
20260505
Application Date
20251027

Claims (8)

  1. 1. The water-based corrosion inhibition anticorrosive paint is characterized by comprising a component A and a component B in a mass ratio of 4:1-6:1, wherein the component A comprises the following components in parts by weight: 60.0 to 75.0 parts of aqueous hydroxy acrylic dispersion; 15.0-20.0 parts of rutile titanium dioxide; 3.0-5.0 parts of barium sulfate; 2.0-4.0 parts of film forming auxiliary agent; 3.0-8.0 parts of composite corrosion inhibitor; 0.2-0.5 part of flash rust inhibitor; 5.0-10.0 parts of deionized water; 0.5-1.0 part of wetting dispersant; 0.2-0.5 part of defoaming agent; 0.2-0.5 part of leveling agent; the component B is hydrophilic modified aliphatic polyisocyanate; the composite corrosion inhibitor is ZnP-PEG-IPTS-GO, and the preparation method comprises the following steps: (1) Performing condensation reaction on silicon hydroxyl formed by ethoxyl hydrolysis of IPTS and hydroxyl on the surface of GO obtained by an improved Hummers method to generate Si-O-C covalent bond to obtain IPTS-GO, wherein GO is graphene oxide, and IPTS is 3-isocyanatopropyl triethoxysilane; (2) Under the action of a catalyst, isocyanate groups in the IPTS-GO structure and hydroxyl groups at the chain ends of PEG generate carbamate bonds to obtain PEG-IPTS-GO, wherein the PEG is PEG1000; (3) Dispersing PEG-IPTS-GO in deionized water, adding zinc nitrate while stirring, stirring to react an oxygen-containing functional group in a reaction system with Zn 2+ to obtain zinc coordination modified PEG-IPTS-GO, adding disodium hydrogen phosphate into the reaction system after the reaction is finished, stirring to react under a weak acidity condition, generating zinc phosphate crystals on the surface of the zinc coordination modified PEG-IPTS-GO in situ, and removing impurities through deionized water dialysis after the reaction is finished, and finally obtaining ZnP-PEG-IPTS-GO through freeze drying, wherein ZnP is zinc phosphate; The step (1) is as follows: (a) Uniformly dispersing GO obtained by the improved Hummers method in 100mL of absolute ethyl alcohol under ice-water bath to obtain GO dispersion liquid of 0.5-2 mg/mL; (b) Under the protection of nitrogen, 50-100 mu L of IPTS is dropwise added into GO dispersion liquid under the condition of stirring, after the dropwise addition is completed, stirring is carried out at 60-70 ℃ for at least 4 hours, after the reaction is completed, the product is centrifugally washed for at least 3 times by ethanol until supernatant liquid has no obvious oily matter, and solid products are collected and dried to obtain the IPTS-GO.
  2. 2. The aqueous corrosion-inhibiting and anti-corrosive paint according to claim 1, wherein the step (2) is as follows: (c) Uniformly dispersing all IPTS-GO obtained in the step (1) in 100mL of absolute ethyl alcohol to obtain an IPTS-GO dispersion liquid; (d) Adding 0.2-0.5 g PEG1000 and 10-20 mu L catalyst DBTDL into IPTS-GO dispersion liquid under the protection of nitrogen, stirring at 70-80 ℃ for reaction for at least 6 hours, collecting solid products after the reaction is finished, centrifugally washing the solid products with absolute ethyl alcohol for at least 3 times, and drying to obtain the PEG-IPTS-GO.
  3. 3. The aqueous corrosion-inhibiting and anti-corrosive paint according to claim 1, wherein the step (3) is as follows: Dispersing all PEG-IPTS-GO obtained in the step (2) in 50mL of deionized water to obtain PEG-IPTS-GO dispersion; Adding 149mg of zinc nitrate into PEG-IPTS-GO dispersion liquid, uniformly stirring, reacting for at least 20min, adding 156mg of disodium hydrogen phosphate into a reaction system, uniformly stirring, adjusting the pH value of the reaction system to be 5-6, stirring and reacting for at least 2h at 60-80 ℃, putting the obtained product into a dialysis bag after the reaction is finished, dialyzing for at least 30h by deionized water, changing water for at least 4 times, and finally, freeze-drying the dialyzed product to obtain a black powdery product, namely the composite corrosion inhibitor ZnP-PEG-IPTS-GO.
  4. 4. The aqueous corrosion and corrosion inhibiting coating according to claim 1, wherein the wetting dispersant is a high molecular weight wetting dispersant.
  5. 5. The aqueous corrosion and corrosion inhibiting coating according to claim 1, wherein the defoamer is a polyether siloxane defoamer.
  6. 6. The aqueous corrosion and corrosion inhibiting coating according to claim 1, wherein the film forming aid comprises at least one of alcohol ester-12 and propylene glycol methyl ether.
  7. 7. The aqueous corrosion and corrosion inhibiting paint according to claim 1, wherein the flash rust inhibitor is sodium molybdate or 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid.
  8. 8. The aqueous corrosion inhibition anticorrosive paint according to claim 1, wherein the leveling agent is an acrylic leveling agent.

Description

Water-based corrosion inhibition anticorrosive paint and preparation method thereof Technical Field The invention relates to the technical field of anti-corrosion paint, in particular to water-based corrosion inhibition anti-corrosion paint and a preparation method thereof. Background The water-based anticorrosive paint has low Volatile Organic Compound (VOC) content and is environment-friendly, so that the water-based anticorrosive paint becomes an important development direction in the field of corrosion protection. The aqueous bi-component hydroxy acrylic acid-polyurethane system combines the weather resistance and flexibility of acrylic resin with the wear resistance and high hardness of polyurethane, and has wide application prospect. However, the corrosion protection performance of the system is largely dependent on the corrosion inhibitor added. The traditional corrosion inhibitor, such as zinc phosphate, aluminum tripolyphosphate and the like, is generally introduced into a coating system in a physical blending mode, and has the inherent defects that firstly, the compatibility with a resin matrix is poor, aggregation or precipitation from the coating is easy to occur, so that the coating is defective and the long-term corrosion resistance is reduced, secondly, the interface bonding force with a base material is weak, a firm and compact protective layer is difficult to form on the metal surface, and thirdly, various corrosion-resistant components (such as a physical barrier type and a chemical passivation type) lack of synergistic effect, so that the improvement of the overall corrosion resistance is limited. Graphene Oxide (GO) is considered as an ideal physical barrier material due to its unique lamellar structure and excellent barrier properties, but it is easily agglomerated in aqueous systems and has poor compatibility with resins. Zinc phosphate is a classical passive corrosion inhibitor. At present, the prior art tries to simply and compositely use the two materials, but most of the materials are physically mixed, the interface binding force is weak, and the synergistic enhancement effect of physical barrier and chemical passivation cannot be fully exerted. Therefore, the development of a novel composite corrosion inhibitor which can be well compatible with a resin matrix and firmly combined with a metal substrate and can realize efficient synergy of different corrosion prevention mechanisms is important for improving the comprehensive corrosion prevention performance of the water-based two-component coating, which is also the starting point of the invention. Disclosure of Invention The problems in the prior art are that zinc phosphate is independently used as a corrosion inhibition additive of the water-based anticorrosive paint, the zinc phosphate is easy to agglomerate and has poor compatibility with resin, and the water-based anticorrosive paint forms a protective coating on the metal surface, so that the corrosion resistance is poor and unstable. Aiming at the technical problems, the invention provides a water-based corrosion inhibition anticorrosive paint which comprises a component A and a component B in a mass ratio of 4:1-6:1, wherein the component A comprises the following components in parts by weight: 60.0 to 75.0 parts of aqueous hydroxy acrylic dispersion; 15.0-20.0 parts of rutile titanium dioxide; 3.0-5.0 parts of barium sulfate; 2.0-4.0 parts of film forming auxiliary agent; 3.0-8.0 parts of composite corrosion inhibitor; 0.2-0.5 part of flash rust inhibitor; 5.0-10.0 parts of deionized water; 0.5-1.0 part of wetting dispersant; 0.2-0.5 part of defoaming agent; 0.2-0.5 part of leveling agent; The component B is hydrophilic modified aliphatic polyisocyanate. Preferably, the composite corrosion inhibitor is ZnP-PEG-IPTS-GO, and the preparation method comprises the following steps: (1) Condensing silicon hydroxyl formed by ethoxyl hydrolysis of IPTS with hydroxyl (-OH) on the surface of GO obtained by an improved Hummers method to form a Si-O-C covalent bond to obtain IPTS-GO; (2) Under the action of a catalyst, isocyanate groups (-NCO) in the IPTS-GO structure and hydroxyl (-OH) at the end of the PEG chain generate carbamate bonds (-NH-COO-), and PEG hydrophilic chain segments are introduced into the silane modified GO structure to obtain PEG-IPTS-GO; (3) Dispersing PEG-IPTS-GO in deionized water, adding zinc nitrate while stirring, stirring to react an oxygen-containing functional group in a reaction system with Zn 2+ to obtain zinc coordination modified PEG-IPTS-GO, adding disodium hydrogen phosphate into the reaction system after the reaction is finished, stirring to react under a weak acidic condition to enable zinc coordination modified PEG-IPTS-GO to form zinc phosphate crystals on the surface in situ, dialyzing with deionized water to remove impurities after the reaction is finished, and finally obtaining ZnP-PEG-IPTS-GO through freeze drying. In the reaction process, eth