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CN-121975404-A - Zinc-rich heavy-duty anticorrosive paint and preparation method thereof

CN121975404ACN 121975404 ACN121975404 ACN 121975404ACN-121975404-A

Abstract

The invention provides a zinc-rich heavy-duty anticorrosive paint and a preparation method thereof, belonging to the technical field of paint compositions, and comprising the following steps of mixing bisphenol A type liquid epoxy resin, zinc gluconate supported modified GO, a dispersing agent, a defoaming agent and a mixed solvent, sequentially adding fumed silica, polylactic acid@garnet composite powder and zinc powder, and stirring to obtain a component A; and mixing and stirring the polyamide curing agent and the curing accelerator to obtain a component B, and mixing and stirring the component A and the component B to defoam to obtain the zinc-rich heavy anti-corrosion coating. The invention can enhance the cathode protection effect and the shielding and blocking capability to corrosive media, thereby improving the long-acting heavy-duty corrosion resistance.

Inventors

  • XUE FENG
  • ZHONG GUANG
  • YAN XUN

Assignees

  • 陕西蓝晟新材料研发有限公司

Dates

Publication Date
20260505
Application Date
20260407

Claims (10)

  1. 1. The preparation method of the zinc-rich heavy-duty anticorrosive paint is characterized by comprising the following steps of: S1, dispersing silk fibroin modified graphene oxide in absolute ethyl alcohol, magnetically stirring and carrying out ultrasonic treatment, then adding zinc gluconate solution, mixing, heating, adding citric acid, carrying out heat preservation reaction, cooling to room temperature, washing, and freeze-drying to obtain zinc gluconate supported modified GO; S2, drying, grinding and sieving garnet waste materials, adding the garnet waste materials into polylactic acid solution, stirring, performing ultrasonic treatment, evaporating under reduced pressure, drying in vacuum, and cooling to room temperature to obtain polylactic acid@garnet composite powder; S3, mixing bisphenol A type liquid epoxy resin, zinc gluconate supported modified GO, a dispersing agent, a defoaming agent and a mixed solvent, sequentially adding fumed silica, polylactic acid@garnet composite powder and zinc powder, stirring to obtain a component A, mixing a polyamide curing agent and a curing accelerator, stirring to obtain a component B, mixing the component A and the component B, stirring and defoaming to obtain the zinc-rich heavy anti-corrosion coating.
  2. 2. The preparation method of the zinc-rich heavy anti-corrosion coating according to claim 1, wherein graphene oxide is added into deionized water, after ultrasonic treatment is carried out for 30-40 min, the graphene oxide is added into silk fibroin dispersion liquid, ammonia water is added dropwise to adjust the pH to 9.8-10.2, after magnetic stirring is carried out at room temperature for 18-20 h, deionized water is used for washing, centrifugation is carried out for 10-15 min at 8000-10000 r/min, sediment is collected, and freeze drying is carried out, so that the zinc-rich heavy anti-corrosion coating is obtained.
  3. 3. The preparation method of the zinc-rich heavy anti-corrosion coating is characterized in that 40-50 parts by mass of silk fibroin is added into 1500-2000 parts by mass of deionized water, and the silk fibroin dispersion is obtained by magnetic stirring for 40-60 min, wherein the amount of graphene oxide in the silk fibroin modified graphene oxide is 5-8 parts by mass, and the amount of deionized water is 500-800 parts by mass.
  4. 4. The preparation method of the zinc-rich heavy anti-corrosion coating according to claim 1 is characterized in that in the step S1, 3-5 parts by mass of silk fibroin modified graphene oxide is dispersed in 500-600 parts by mass of absolute ethyl alcohol, magnetic stirring is carried out for 30-40 min and ultrasonic treatment is carried out for 20-30 min, then 400-600 parts by mass of zinc gluconate solution with the mass fraction of 2wt% is added and mixed, the mixture is placed in a single-mouth round-bottom flask, the temperature is raised to 70-75 ℃, 1-1.2 parts by mass of citric acid is added and the mixture is subjected to heat preservation reaction for 8-10 h, after cooling to room temperature, deionized water and absolute ethyl alcohol are sequentially used for washing for 2-3 times, and finally freeze drying is carried out, so that zinc gluconate loaded modified GO is obtained.
  5. 5. The preparation method of the zinc-rich heavy-duty anticorrosive paint according to claim 1, wherein the polylactic acid solution is obtained by adding 4-5 parts by mass of polylactic acid into 100-120 parts by mass of methylene dichloride and magnetically stirring at room temperature for 50-80 min at 400-500 r/min.
  6. 6. The preparation method of the zinc-rich heavy anti-corrosion coating according to claim 1, wherein in the step S2, 30-40 parts by mass of garnet waste is dried at 70-80 ℃ for 4-5 hours, ground and sieved by a 300-mesh sieve, the mixture is added into polylactic acid solution under continuous stirring, the mixture is stirred at 600-800 r/min for 30-40 min, the mixture is further raised to 1300r/min for dispersing for 20-30 min, the mixture is subjected to ultrasonic treatment for 10-20 min, the mixture is transferred into a rotary evaporation device, dichloromethane is distilled off under reduced pressure under a water bath condition of 35-40 ℃, the mixture is dried at 50-55 ℃ for 8-10 hours in vacuum, and the mixture is cooled to room temperature, so that polylactic acid@garnet composite powder is obtained.
  7. 7. The preparation method of the zinc-rich heavy anti-corrosion coating according to claim 1, wherein the component A is prepared by mixing bisphenol A type liquid epoxy resin, zinc gluconate supported modified GO, a dispersing agent, a defoaming agent and a mixed solvent, premixing for 5-8 min at 800r/min, dispersing for 10-15 min after increasing to 1500r/min, adding fumed silica, dispersing for 30-40 min at high speed at 1800-2000 r/min, slowly adding polylactic acid@garnet composite powder, continuously dispersing for 10-15 min at 1000-1200 r/min, slowly adding zinc powder into the mixed system for 4-5 times, controlling the rotating speed in the adding process, and continuously stirring for 20-30 min at 650-700 r/min after all adding.
  8. 8. The preparation method of the zinc-rich heavy anti-corrosion coating is characterized in that the mixed solvent is dimethylbenzene and n-butanol, the mass ratio of the dimethylbenzene to the n-butanol in the mixed solvent is 7:3, and the zinc powder is obtained by uniformly mixing 700-720 parts by mass of flaky zinc powder and 60-80 parts by mass of spherical zinc powder in advance.
  9. 9. The preparation method of the zinc-rich heavy-duty coating according to claim 1, wherein the component B is obtained by mixing a polyamide curing agent and a curing accelerator and stirring for 5-8 min under the condition of 300 r/min; The zinc-rich heavy anti-corrosion coating is prepared by mixing the component A and the component B, stirring for 8-10 min under the condition of 300-400 r/min, and defoaming for 5-8 min under the condition of-0.08 to-0.09 MPa.
  10. 10. The zinc-rich heavy anti-corrosion coating is characterized by being prepared by a preparation method of the zinc-rich heavy anti-corrosion coating according to any one of claims 1-9, and comprises a component A and a component B, wherein the component A comprises, by mass, 90-100 parts of bisphenol A type liquid epoxy resin, 3-6 parts of zinc gluconate supported modified GO, 2-5 parts of dispersing agent, 0.8-1.2 parts of defoaming agent, 10-20 parts of mixed solvent, 3-5 parts of fumed silica, 12-16 parts of polylactic acid@garnet composite powder and 760-800 parts of zinc powder, and the component B comprises, by mass, 90-110 parts of polyamide curing agent and 0.8-1.2 parts of curing accelerator.

Description

Zinc-rich heavy-duty anticorrosive paint and preparation method thereof Technical Field The invention relates to the technical field of coating compositions, in particular to a zinc-rich heavy-duty anticorrosive coating and a preparation method thereof. Background The zinc-rich heavy anti-corrosion coating can provide cathode protection for steel base materials through zinc powder sacrificial anode action and has the shielding and blocking effects after film formation, and is often applied to long-term service environments such as bridges, marine equipment, storage tanks, pipelines and wind power towers. The existing zinc-rich paint generally takes epoxy resin, polyurethane modified resin or inorganic silicate as a film-forming matrix and is matched with high-content zinc powder to construct an anti-corrosion system. The traditional zinc-rich coating gradually exposes some common problems in practical application along with the gradual development of service environment from general atmospheric environment to high humidity, high salt fog, dry-wet alternation, acid-base medium and complex mechanical stress environment, firstly, in order to ensure cathode protection effect, high-content zinc powder is usually required to be added in a system, but the high-content zinc powder is easy to cause the increase of system viscosity and easy to form pores, shrinkage cavities and local weak areas in the film forming process, secondly, when effective conductive contact among zinc powder particles is insufficient, cathode protection effect is difficult to continuously and stably exert, the utilization rate of partial zinc powder is not high after the zinc powder is isolated and coated by resin, so that the zinc powder addition amount is high but effective protection efficiency is limited, thirdly, the brittleness of the coating is easy to increase and the adhesive force is easy to be reduced due to high filler load in the zinc-rich system, thereby accelerating corrosion medium infiltration and weakening long-term protection effect. In order to improve the corrosion resistance of zinc-rich coating, the prior art generally adopts two ideas, namely, on the basis of keeping high zinc content, auxiliary components such as flaky filler, nano oxide, graphene oxide, carbon material or mineral filler are introduced to enhance shielding and blocking capability and improve local conductive network among zinc powder particles, for example, patent application document with publication number of CN112961571A discloses an epoxy zinc-rich corrosion-resistant coating containing graphene oxide/black talc composite material and a preparation method thereof, which provides corrosion resistance through a two-dimensional lamellar structure of the graphene oxide/black talc composite material, but the two-dimensional nano lamellar material is easy to stack and agglomerate, and can possibly introduce local defects when the interface compatibility of the two-dimensional nano lamellar material and a resin matrix is insufficient, so that the performance of the effective barrier effect is influenced. The other is to carry out organic modification, coupling modification or resin phase regulation on the surface of zinc powder or the surface of inert filler to improve the dispersion stability and interface bonding capability of pigment and filler in the resin, for example, the patent application document with publication No. CN117070123A discloses a solvent type zinc-rich heavy anti-corrosion coating, which modifies flaky zinc powder by a siloxane coupling agent to improve the dispersion stability and interface bonding capability of filler in the resin, but if the modified layer is too thick or the interface effect is too strong, the direct contact among zinc powder particles may be weakened to influence the cathode protection continuity, and further influence the final anti-corrosion effect of zinc rich. In addition, although the traditional filler such as talcum powder and mica powder has certain shielding and thickening effects, the traditional filler mainly has an inert filling effect, and can have negative effects on the local conductive connectivity and the transmission path of zinc powder particles, so that cathode protection and shielding protection are difficult to be simultaneously considered, and the corrosion resistance is further influenced. Therefore, a zinc-rich heavy-duty anticorrosive paint and a preparation method thereof are needed to solve the technical problems. Disclosure of Invention In view of the above, the invention provides a zinc-rich heavy-duty coating and a preparation method thereof, which can enhance the cathodic protection effect and the shielding and blocking capacity to corrosive media, thereby improving the long-acting heavy-duty corrosion resistance. In order to achieve the aim, the invention provides a zinc-rich heavy-duty anticorrosive paint and a preparation method thereof, comprising the following steps: S1, dis