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CN-122011886-A - Metal surface anticorrosive paint and preparation method thereof

CN122011886ACN 122011886 ACN122011886 ACN 122011886ACN-122011886-A

Abstract

The invention discloses a metal surface anti-corrosion coating and a preparation method thereof, and relates to the field of metal anti-corrosion coatings. When the metal surface anticorrosive paint is prepared, modified castor oil and triethylamine hydrochloride react to prepare castor oil-based cross-linking agent, hexafluorobisphenol A and epichlorohydrin are subjected to epoxidation reaction to prepare epoxy prepolymer, the epoxy prepolymer and protocatechuic acid react to prepare modified epoxy resin, 2-aminobenzothiazole and isocyanatopropyl triethoxysilane react to prepare modified silane, the modified epoxy resin, the modified silane and the mixed solvent are uniformly mixed, and a leveling agent and the castor oil-based cross-linking agent are added to prepare the metal surface anticorrosive paint. The metal surface anticorrosive paint prepared by the invention has excellent corrosion resistance, antibacterial property and high adhesive force.

Inventors

  • HAN LIN
  • XUE HUIJIA
  • ZHANG LONGXIANG

Assignees

  • 深圳市易植医疗科技有限公司

Dates

Publication Date
20260512
Application Date
20260311

Claims (9)

  1. 1. A metal surface anticorrosive paint is characterized in that the metal surface anticorrosive paint is prepared by reacting modified castor oil and triethylamine hydrochloride to prepare castor oil-based cross-linking agent, reacting an epoxy prepolymer and protocatechuic acid to prepare modified epoxy resin, reacting 2-aminobenzothiazole and isocyanatopropyl triethoxysilane to prepare modified silane, uniformly mixing the modified epoxy resin, the modified silane and a mixed solvent, and adding a leveling agent and the castor oil-based cross-linking agent; The modified castor oil is prepared by grafting epichlorohydrin on castor oil; the mixed solvent is prepared by mixing butyl acetate and dimethylbenzene.
  2. 2. The anticorrosive coating for metal surfaces according to claim 1, wherein the epoxy prepolymer is prepared by epoxidation of hexafluorobisphenol a and epichlorohydrin.
  3. 3. The preparation method of the metal surface anticorrosive paint is characterized by comprising the following preparation steps: (1) Uniformly mixing modified castor oil, triethylamine hydrochloride and deionized water according to the mass ratio of (0.5-0.7) (0.4-0.5), heating to 55-65 ℃, stirring for reaction for 3.5-4.5 h, decompressing and dehydrating, adding toluene with the mass of 0.9-1.1 times of that of the modified castor oil, heating to 80-90 ℃ for azeotropic dehydration, heating to 85-95 ℃, decompressing and removing toluene to obtain the castor oil-based cross-linking agent; (2) Uniformly mixing an epoxy prepolymer, protocatechuic acid and p-toluenesulfonic acid monohydrate according to the mass ratio of (0.02-0.04) (0.01-0.02), heating to 75-85 ℃ under the protection of nitrogen, heating to react for 4.5-5.5 h at the speed of 9-11 ℃ per hour, cooling to room temperature, extracting for 2-4 times by using deionized water, and taking an organic phase to prepare modified epoxy resin; (3) Uniformly mixing 2-aminobenzothiazole and anhydrous tetrahydrofuran according to the mass ratio of 1 (6-8), heating to 45-55 ℃ under the protection of nitrogen, adding isocyanatopropyl triethoxysilane, continuously stirring and reacting for 1.5-2.5 h, and removing the anhydrous tetrahydrofuran by reduced pressure distillation to obtain modified silane; (4) Uniformly mixing the modified epoxy resin, the modified silane and the mixed solvent, ultrasonically stirring for 10-20 min at room temperature, adding the leveling agent and the castor oil-based cross-linking agent, stirring for 4-6 min at room temperature, adjusting the viscosity to 500-1500 mPa.s by using the mixed solvent, and defoaming for 10-20 min under vacuum condition to prepare the metal surface anti-corrosion coating.
  4. 4. The preparation method of the metal surface anticorrosive paint according to claim 3, wherein the preparation process of the modified castor oil in the step (1) is characterized in that the castor oil and the epichlorohydrin are uniformly mixed according to the mass ratio of 1 (4-5), methanol with the equivalent weight of 0.09-0.11 times of castor oil hydroxyl is added, the temperature is raised to 65-75 ℃, 48wt% sodium hydroxide aqueous solution with the equivalent weight of 0.7-0.8 times of castor oil hydroxyl is uniformly dripped within 1.5-2.5 hours, the mixture is subjected to reduced pressure reflux stirring reaction for 1.5-2.5 hours, the mixture is cooled to room temperature, the mixture is filtered, filtrate is taken, washed 3-5 times by deionized water, an organic phase is separated, and the methanol and the epichlorohydrin are removed by reduced pressure distillation at 75-85 ℃ to obtain the modified castor oil.
  5. 5. The method for preparing the metal surface anticorrosive paint according to claim 3, wherein the preparation process of the epoxy prepolymer in the step (2) is characterized in that hexafluorobisphenol A and epichlorohydrin are uniformly mixed according to the molar ratio of 1 (9-11), absolute ethyl alcohol with the mass of 0.15-0.25 times of that of hexafluorobisphenol A is added, the temperature is raised to 45-55 ℃ under the protection of nitrogen, stirring is carried out for 15-25 min, 48wt% sodium hydroxide aqueous solution with the mass of 0.25-0.3 times of that of hexafluorobisphenol A is uniformly added in 1-2 h, the temperature is raised to 55-65 ℃, stirring is carried out for 2-3 h, cooling to room temperature, filtering, washing filtrate with deionized water for 2-4 times, standing for layering, drying an organic phase with absolute magnesium sulfate for 10-12 h, filtering, and carrying out reduced pressure distillation on the filtrate to remove the epichlorohydrin and absolute ethyl alcohol, thus obtaining the epoxy prepolymer.
  6. 6. The method for preparing a metal surface anticorrosive paint according to claim 3, wherein the molar ratio of the propyltriethoxysilane isocyanate to the 2-aminobenzothiazole in the step (3) is 1:1.
  7. 7. The method for preparing the metal surface anticorrosive paint according to claim 3, wherein the preparation process of the mixed solvent in the step (4) is that butyl acetate and dimethylbenzene are uniformly mixed according to a mass ratio of 1:1 to prepare the mixed solvent.
  8. 8. The method for preparing a metal surface anticorrosive paint according to claim 3, wherein the leveling agent in the step (4) is a BSM1333 polyether modified organosilicon leveling agent.
  9. 9. The preparation method of the metal surface anticorrosive paint according to claim 3, wherein the proportion of the epoxy resin, the modified silane, the mixed solvent, the leveling agent and the castor oil-based cross-linking agent in the step (4) is 50-60 parts by mass of the modified epoxy resin, 2-4 parts by mass of the modified silane, 2-4 parts by mass of the mixed solvent, 0.5-1.5 parts by mass of the leveling agent and 8-10 parts by mass of the castor oil-based cross-linking agent.

Description

Metal surface anticorrosive paint and preparation method thereof Technical Field The invention relates to the field of metal anticorrosive paint, in particular to a metal surface anticorrosive paint and a preparation method thereof. Background In the medical field, the metal material is widely applied to surgical instruments, implants, diagnostic equipment, medical furniture and the like, is easily corroded by multiple factors such as chloride ions, acid-base mediums, microorganisms, ultraviolet rays and the like in a complex service environment, causes corrosion failure, and causes great economic loss and potential safety hazard. The metal surface coating protection technology is used as an anti-corrosion means with low cost and wide applicability, and becomes a core support for guaranteeing the long-term service of metal components, wherein the research and the development and the application of high-performance anti-corrosion paint are focused. Epoxy resins have long been one of the core resin substrates of metal surface coatings by virtue of their combination of adhesion to metal substrates, chemical resistance, high crosslink density, and good mechanical properties. However, when faced with severe requirements specific to medical environments, limitations in terms of corrosion protection and antibacterial properties become particularly prominent. The common epoxy resin realizes physical shielding and corrosion prevention only by means of a compact paint film formed after curing, the corrosion prevention mechanism is single, the requirements of medical scenes cannot be met, corrosive ions such as Cl-, PO 4 -, organic acids and the like in medical environments can permeate into a metal interface through pores to cause pitting corrosion and intergranular corrosion, and particularly, the surface passivation film of the common medical metals such as stainless steel, titanium alloy and the like can be damaged by ion permeation, so that corrosion failure is accelerated. Meanwhile, the epoxy resin molecules have no antibacterial function, and a compact paint film structure provides good adhesion and propagation carriers for microorganisms, so that the epoxy resin has potential hidden danger of medical safety. Therefore, the development of the epoxy resin with high stability, high corrosion resistance, high biological safety and long-acting antibacterial property can break through the application limit, and the specialized protection requirement of medical metal instruments is met. Disclosure of Invention The invention aims to provide a metal surface anti-corrosion coating and a preparation method thereof, which are used for solving the problems in the prior art. In order to solve the technical problems, the invention provides the following scheme: A metal surface anticorrosive paint is prepared by reacting modified castor oil and triethylamine hydrochloride to prepare castor oil-based cross-linking agent, epoxidizing hexafluorobisphenol A and epichlorohydrin to prepare epoxy prepolymer, reacting the epoxy prepolymer with protocatechuic acid to prepare modified epoxy resin, reacting 2-aminobenzothiazole with isocyanatopropyl triethoxysilane to prepare modified silane, uniformly mixing the modified epoxy resin, the modified silane and a mixed solvent, and adding a leveling agent and the castor oil-based cross-linking agent; The modified castor oil is prepared by grafting epichlorohydrin on castor oil; the mixed solvent is prepared by mixing butyl acetate and dimethylbenzene. The epoxy prepolymer is prepared by epoxidation reaction of hexafluorobisphenol A and epichlorohydrin. The preparation method of the metal surface anticorrosive paint comprises the following preparation steps: (1) Uniformly mixing modified castor oil, triethylamine hydrochloride and deionized water according to the mass ratio of (0.5-0.7) (0.4-0.5), heating to 55-65 ℃, stirring for reaction for 3.5-4.5 h, decompressing and dehydrating, adding toluene with the mass of 0.9-1.1 times of that of the modified castor oil, heating to 80-90 ℃ for azeotropic dehydration, heating to 85-95 ℃, decompressing and removing toluene to obtain the castor oil-based cross-linking agent; (2) Uniformly mixing an epoxy prepolymer, protocatechuic acid and p-toluenesulfonic acid monohydrate according to the mass ratio of (0.02-0.04) (0.01-0.02), heating to 75-85 ℃ under the protection of nitrogen, heating to react for 4.5-5.5 h at the speed of 9-11 ℃ per hour, cooling to room temperature, extracting for 2-4 times by using deionized water, and taking an organic phase to prepare modified epoxy resin; (3) Uniformly mixing 2-aminobenzothiazole and anhydrous tetrahydrofuran according to the mass ratio of 1 (6-8), heating to 45-55 ℃ under the protection of nitrogen, adding isocyanatopropyl triethoxysilane, continuously stirring and reacting for 1.5-2.5 h, and removing the anhydrous tetrahydrofuran by reduced pressure distillation to obtain modified silane; (4) Uniformly m