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CN-121610182-B - High-chromaticity corrosion-resistant yellow paint and preparation method thereof

CN121610182BCN 121610182 BCN121610182 BCN 121610182BCN-121610182-B

Abstract

The invention relates to the field of coatings, and discloses a high-chromaticity corrosion-resistant yellow coating and a preparation method thereof. The paint comprises, by weight, 50-60 parts of aqueous epoxy modified silicone resin, 25-35 parts of modified bismuth vanadate, 1-2 parts of nanocellulose, 0.3-0.8 part of dispersing agent, 0.2-0.5 part of defoaming agent, 0.2-0.5 part of leveling agent and 2-3 parts of corrosion inhibition pigment. The formula system of the high-chromaticity corrosion-resistant yellow paint is innovative, a ternary synergistic system of the waterborne epoxy modified organic silicon resin-modified bismuth vanadate-nanocellulose is constructed, and the waterborne epoxy modified organic silicon resin-modified bismuth vanadate-nanocellulose has excellent chromaticity and corrosion resistance. The coating adopts flaky bismuth vanadate which is induced by a microwave method, has few lattice defects and color break-through, and has high corrosion resistance.

Inventors

  • LI WENJING
  • LI DAOYU
  • ZENG HUA
  • WANG XIAOHUI

Assignees

  • 成都先进金属材料产业技术研究院股份有限公司

Dates

Publication Date
20260505
Application Date
20260202

Claims (8)

  1. 1. A high-chromaticity corrosion-resistant yellow paint is characterized by comprising, by weight, 50-60 parts of aqueous epoxy modified organic silicon resin, 25-35 parts of modified bismuth vanadate, 1-2 parts of nanocellulose, 0.3-0.8 part of dispersing agent, 0.2-0.5 part of defoaming agent, 0.2-0.5 part of leveling agent and 2-3 parts of corrosion-resistant pigment, wherein the modified bismuth vanadate is flaky bismuth vanadate which is induced by a microwave method, the preparation process of the modified bismuth vanadate comprises the steps of mixing bismuth salt with a first solvent to form a first solution, mixing vanadium salt, tartaric acid with a second solvent to form a second solution, adjusting the pH of the second solution to 4.5-5.5, mixing the first solution with the second solution in a microwave reactor, reacting at a temperature to form a bismuth vanadate precursor, dispersing the bismuth vanadate precursor in a preset solution, thermally curing the third solution containing dopamine ion, and forming a solid calcium chloride cross-linked solid phase by adding calcium chloride to the solid calcium chloride coated with the solid calcium chloride.
  2. 2. The high-chromaticity corrosion-resistant yellow paint as claimed in claim 1, wherein the nanocellulose is nanocellulose subjected to surface treatment by phosphorylation, the diameter is 5-60 nm, and the length is 50 nm-2 μm.
  3. 3. A process for preparing a high chroma corrosion resistant yellow paint, characterized in that the process is used for preparing a yellow paint as claimed in claim 1 or 2 and comprises the steps of: The preparation method comprises the steps of mixing bismuth salt with a first solvent to form a first solution, mixing vanadium salt, tartaric acid with a second solvent to form a second solution, regulating the pH value of the second solution to 4.5-5.5, mixing the first solution and the second solution in a microwave reactor, reacting at a preset temperature to form a bismuth vanadate precursor, dispersing the bismuth vanadate precursor in a third solution containing polydopamine, forming a polydopamine coating layer outside the bismuth vanadate precursor, adding sodium alginate and calcium chloride solution into the third solution, forming a calcium-alginate grid structure outside the polydopamine coating layer through ionic crosslinking, carrying out solid-liquid separation on the solution after ionic crosslinking, collecting solids and carrying out heat curing on the solids; premixing modified bismuth vanadate, waterborne epoxy modified organic silicon resin, deionized water, a dispersing agent and a corrosion inhibition pigment, and performing dispersion grinding to obtain pigment slurry; And stirring and mixing the nanocellulose, the defoamer and the pigment slurry, dispersing and grinding, adding the flatting agent, and stirring and mixing to obtain the yellow paint.
  4. 4. The method for preparing the high-chromaticity corrosion-resistant yellow paint according to claim 3, wherein the concentration of bismuth ions in the first solution is 0.3-0.8 mol/L, the concentration of vanadium ions in the second solution is 0.3-0.8 mol/L, the molar ratio of the vanadium salt to the tartaric acid is 1:1-1.2, and the volume ratio of the first solution to the second solution for mixing is 1:0.9-1.
  5. 5. The method for preparing the high-chromaticity corrosion-resistant yellow paint according to claim 3, wherein the frequency of the microwave reactor is 2.45GHz, the power is 800W, the reaction temperature of the first solution and the second solution is 60-90 ℃ and the reaction time is 10-30 min.
  6. 6. The preparation method of the high-chromaticity corrosion-resistant yellow paint according to claim 3, wherein the solvent of the third solution is a tris (hydroxymethyl) aminomethane hydrochloride buffer solution, the concentration of polydopamine in the third solution is 1-2 mg/mL, the mass concentration of the bismuth vanadate precursor dispersed in the third solution is 100-300 g/L, the bismuth vanadate precursor is dispersed in the third solution and then oscillated for 1-3 h at 40-60 ℃, the mass ratio of sodium alginate to bismuth vanadate precursor is 1.2-2:100, the concentration of the calcium chloride solution is 0.1-0.25 mol/L, and the volume ratio of the calcium chloride solution to the third solution is 0.25-3.5:100.
  7. 7. The method for preparing the high-chromaticity corrosion-resistant yellow paint according to claim 3, wherein the heat curing of the solid comprises heating the solid to 250-300 ℃ at 3-7 ℃ per min for 20-50 min, and heating the solid to 400-450 ℃ at 7-10 ℃ per min for 5-20 min.
  8. 8. The method for preparing the high-chromaticity corrosion-resistant yellow paint according to claim 3, wherein the pre-mixed stirring speed is 1200-1500 rpm, the stirring time is 10-30 min, the stirring speed of stirring and mixing is 400-600 rpm, and the stirring time is 15-45 min.

Description

High-chromaticity corrosion-resistant yellow paint and preparation method thereof Technical Field The invention relates to the field of coatings, in particular to a high-chromaticity corrosion-resistant yellow coating and a preparation method thereof. Background For marine chemical facilities (such as offshore drilling platforms, coastal petrochemical plants, storage tanks, conveying pipelines and the like) in extremely corrosive environments, a high-visibility yellow anti-corrosion coating plays a very important role, namely, firstly, the yellow anti-corrosion coating can be used as a striking safety warning mark to ensure the operation safety of personnel and equipment, and secondly, the anti-corrosion coating is used as a first protective layer of a metal substrate and needs to resist the common corrosion of multiple factors such as high humidity, high salinity, chemical atmosphere, strong ultraviolet radiation and the like for a long time. The harsh application scenario presents a great challenge to the environmental friendliness, long-term weatherability and long-lasting protection ability of yellow coatings. At present, yellow anticorrosive paint suitable for the field can be mainly divided into a first generation traditional system based on heavy metal pigment, a second generation system based on organic pigment and a third generation environment-friendly inorganic system based on bismuth vanadate pigment according to the technical route. However, there is a need for improvement in all three types of coatings. The environmental protection of the first generation traditional system is completely behind. Heavy metal pigments, represented by lead chrome yellow (PbCrO 4), have been the mainstay of high performance yellow anticorrosive coatings. They have excellent hiding power, chemical stability and weather resistance. However, its inherent drastic and ecological accumulation, is fundamentally conflicting with increasingly stringent environmental regulations. Today, where green manufacturing is advocated, the development and application of non-toxic and harmless alternatives has become an irreversible industry trend, and such technologies necessarily face obsolete results. The durability of second generation systems based on organic pigments presents a natural bottleneck. To avoid heavy metal hazards, the industry has turned to the use of organic yellow pigments. Although they can provide vivid color, their chromophore molecular structure is easy to undergo photooxidation degradation under the continuous irradiation of strong ultraviolet rays in marine environment, resulting in rapid pulverization and fading of the coating. Meanwhile, organic molecules are easy to generate chemical change under the action of acid-base medium in chemical atmosphere, and further accelerate performance decay. The durable natural short plates thereof lead to shortened maintenance period and high total life cycle cost, and cannot meet the core requirements of marine chemical facilities on long-acting protection (usually more than 15 years). The performance potential of the third generation environmentally friendly inorganic coatings based on bismuth vanadate pigments has not been fully released. However, this type of coating generally suffers from insufficient color properties, improved coating barrier properties, and the like. In general, the existing third-generation environment-friendly inorganic yellow paint is the development direction of the main stream in the future, but the two key indexes of chromaticity and corrosion resistance are significantly different from the ideal level, and a great room for improvement still exists. Disclosure of Invention Aiming at the problems existing in the prior art, the main purpose of the invention is to provide a high-chromaticity corrosion-resistant yellow paint and a preparation method thereof. According to one aspect of the invention, a high-chroma corrosion-resistant yellow paint is provided, which comprises, by weight, 50-60 parts of aqueous epoxy modified silicone resin, 25-35 parts of modified bismuth vanadate, 1-2 parts of nanocellulose, 0.3-0.8 part of dispersing agent, 0.2-0.5 part of defoaming agent, 0.2-0.5 part of leveling agent and 2-3 parts of corrosion-inhibiting pigment. According to one embodiment of the invention, the modified bismuth vanadate is sheet-shaped bismuth vanadate which is induced by a microwave method, and the sheet-shaped bismuth vanadate is coated with a carbon layer formed by polydopamine and a mayenite phase acid-resistant layer. According to one embodiment of the invention, the nanocellulose is nanocellulose subjected to surface treatment by phosphorylation, the diameter is 5-60 nm, and the length is 50 nm-2 μm. According to another aspect of the present invention, there is provided a method for preparing a high chroma corrosion-resistant yellow paint for preparing the yellow paint according to any one of the above embodiments, comprising the step