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CN-118685094-B - Thermoreversible self-induction color-changing anticorrosive paint for thermal fault detection and preparation method thereof

CN118685094BCN 118685094 BCN118685094 BCN 118685094BCN-118685094-B

Abstract

The invention discloses a thermochromic irreversible self-induction color-changing anticorrosive paint for thermal fault detection and a preparation method thereof, relates to the field of anticorrosive materials, and aims to solve the problems of unstable color-changing performance, poor stability and poor color-changing durability of the existing thermochromic materials. The preparation method comprises the steps of (1) adding nickel ammonium sulfate hexahydrate into an organic solvent A to obtain a mixed solution, then adding a coloring agent and a color former to form a colored mixed solution, finally adding ferrous ammonium sulfate hexahydrate, carrying out ultrasonic mixing uniformly, carrying out vacuum drying to be gelatinous to obtain a color-changing filler, (2) adding graphene oxide into an N, N-dimethylformamide dispersion liquid of nano titanium dioxide, then adopting a hydrothermal method to prepare a titanium dioxide modified graphene oxide anticorrosive filler, (3) adding the color-changing filler into an epoxy resin emulsion to form a colored emulsion, slowly adding the modified graphene oxide anticorrosive filler to obtain an anticorrosive emulsion, and adding a film-forming auxiliary agent and a curing agent to obtain the thermally irreversible self-induced color-changing anticorrosive paint.

Inventors

  • ZHANG LANHE
  • DING WEI
  • WANG SEN
  • GUAN XIAOZHUO
  • JIA YANPING
  • LIU XU
  • GUO JINGBO
  • XIONG FEI
  • ZHU SUIYI

Assignees

  • 国网吉林省电力有限公司吉林供电公司
  • 东北电力大学

Dates

Publication Date
20260508
Application Date
20240625

Claims (10)

  1. 1. The preparation method of the thermally irreversible auto-induction color-changing anticorrosive paint for thermal fault detection is characterized by comprising the following steps of: (1) Preparing a thermally irreversible self-induced color-changing filler; ① Adding nickel ammonium sulfate hexahydrate into the organic solvent A, and stirring until the mixture is uniform to obtain a mixed solution; ② Then adding a coloring agent and a color former into the mixed solution to form a colored mixed solution; ③ Adding ferrous ammonium sulfate hexahydrate into the colored mixed solution, uniformly mixing by ultrasonic, and drying in vacuum until the mixture is gelatinous to obtain a color-changing filler; (2) Adding graphene oxide into N, N-dimethylformamide dispersion liquid of nano titanium dioxide, and preparing titanium dioxide modified graphene oxide anticorrosive filler by adopting a hydrothermal method; (3) Preparing a thermally irreversible self-induced color-changing anticorrosive paint; ① Adding the color-changing filler prepared in the step (1) into the epoxy resin emulsion, and fully stirring to form a colored emulsion; ② Slowly adding the modified graphene oxide anticorrosive filler prepared in the step (2) into the colored emulsion, and continuously stirring and uniformly mixing to obtain an anticorrosive emulsion; ③ Adding a film forming additive and a curing agent into the anti-corrosion emulsion, and uniformly mixing to obtain the thermally irreversible self-induced color-changing anti-corrosion coating; The colorant in step (1) ② is cobalt oxide and the color former is crystal violet.
  2. 2. The method for preparing the thermally irreversible auto-induction color-changing anticorrosive paint for thermal fault detection according to claim 1, wherein the organic solvent A in the step (1) ① is dimethylbenzene.
  3. 3. The preparation method of the thermally irreversible self-induced color-changing anticorrosive paint for thermal fault detection according to claim 2, wherein the mass ratio of cobalt oxide to nickel ammonium sulfate hexahydrate added in the step (1) ② is 0.5:2, the mass ratio of crystal violet to nickel ammonium sulfate hexahydrate is 0.5:2, and the mass ratio of ferrous ammonium sulfate hexahydrate to nickel ammonium sulfate hexahydrate added in the step (1) ③ is (1-2.5): 4.
  4. 4. The method for preparing the thermally irreversible self-induced color-changing anticorrosive paint for thermal fault detection according to claim 1, wherein the stirring time in the step (1) ① is 2-6 hours, the ultrasonic time in the step (1) ③ is 2-6 hours, and the vacuum drying time in the step (1) ③ is 2-6 hours.
  5. 5. The preparation method of the thermally irreversible self-induced color-changing anticorrosive paint for thermal fault detection according to claim 1, wherein the preparation method is characterized in that the titanium dioxide modified graphene oxide anticorrosive filler prepared in the step (2) comprises the following steps: ① Preparing graphene oxide by adopting a Hummers method; ② Adding nano titanium dioxide into N, N-dimethylformamide, stirring and dispersing uniformly to obtain N, N-dimethylformamide dispersion liquid of the nano titanium dioxide; ③ Adding graphene oxide into N, N-dimethylformamide dispersion liquid of nano titanium dioxide to obtain mixed dispersion liquid; ④ And pouring the mixed dispersion liquid into a reaction kettle for hydrothermal reaction, and then carrying out vacuum drying, ball milling and washing to obtain the modified graphene oxide anticorrosive filler.
  6. 6. The preparation method of the thermally irreversible self-induced color-changing anticorrosive paint for thermal fault detection according to claim 5, wherein the mass ratio of graphene oxide to nano titanium dioxide added in the step (2) ③ is (1.5-3): 1.
  7. 7. The preparation method of the thermally irreversible self-induced color-changing anticorrosive paint for thermal fault detection according to claim 5, wherein the preparation method of the graphene oxide by adopting the Hummers method in the step two ① is characterized by comprising the following steps: Adding crystalline flake graphite and sodium nitrate into concentrated sulfuric acid according to parts by weight, standing and uniformly mixing under the ice water bath condition, adding phosphoric acid, stirring, slowly adding potassium permanganate at a temperature below 4 ℃, reacting for 1h, then continuously reacting for 1h at a temperature of 40 ℃ and at a temperature of 95 ℃ respectively, adding deionized water, standing, slowly dropwise adding hydrogen peroxide to obtain a suspension, ending the reaction, centrifuging, washing the precipitate to be neutral, vacuum drying, grinding and screening to obtain graphene oxide powder.
  8. 8. The preparation method of the thermally irreversible self-induced color-changing anticorrosive paint for thermal fault detection, which is characterized in that the mass ratio of the color-changing filler to the epoxy resin in the step (3) is 1-2.5:10, and the mass ratio of the modified graphene oxide to the epoxy resin is 0.1-0.5:10.
  9. 9. The preparation method of the thermally irreversible self-induced color-changing anticorrosive paint for thermal fault detection according to claim 1, wherein the film-forming auxiliary agent in the step (3) ③ comprises a defoaming agent and a leveling agent, and the mass ratio of the film-forming auxiliary agent to the epoxy resin is 0.1-1:10.
  10. 10. A thermally irreversible auto-induction color-changing anticorrosive paint for thermal fault detection, characterized in that the thermally irreversible auto-induction color-changing anticorrosive paint is prepared by the preparation method of any one of claims 1 to 9.

Description

Thermoreversible self-induction color-changing anticorrosive paint for thermal fault detection and preparation method thereof Technical Field The invention relates to the technical field of anti-corrosion materials, in particular to a thermally irreversible self-induction color-changing anti-corrosion coating for thermal fault detection and a preparation method thereof. Background With the expansion of industrial scale, metal pipelines bearing high temperature and high pressure and equipment such as power transmission lines often fail due to corrosion, aging and other factors in the running process, wherein thermal failure is one of the most common failures. At present, due to the restriction of technical conditions and environmental conditions, the detection mode of a factory and an electric power system for thermal faults is still mainly manual. The traditional manual detection mode has the problems of high labor cost, small detection range, poor operation environment and the like, is difficult to reflect the temperature state of a pipeline in time, and has certain potential safety hazard. The anti-corrosion coating with the heating and the color changing can be different according to the temperature change of the pipeline, so that the aim of thermal fault detection is fulfilled, the problems of misjudgment and missed judgment caused by manual detection are avoided, and meanwhile, the coating can also provide anti-corrosion protection for the metal pipeline, and the service life of the pipeline is prolonged. The principle of color change of irreversible thermochromic materials mainly comprises 1) that the molecular structure of an organic dye changes after being heated, thereby causing color change. Wherein, quinone groups (-C=O) in benzoquinone dye molecules undergo oxidation reaction, and the quinone groups are reduced to alcohol groups (-CHOH) to cause color change, the dye has the problems of poor stability and color-changing durability, and 2) the high molecular polymer color-changing material undergoes oxidation reduction reaction after being heated, and the color changes. For example, thermochromic polyimide has sensitive color change effect, but has poor environmental tolerance, is easily influenced by chemicals, strong acid and strong alkali, and reduces the color change performance, and 3) metal oxide color change materials such as chromium oxide, tungsten oxide, iron oxide and the like, wherein when the temperature is higher, metal ions are diffused, the lattice structure is changed, and the color is changed. However, part of the metal oxides are toxic and harmful, causing environmental pollution. In addition, the development of thermochromic anti-corrosion coatings also needs to consider the chemical reaction of the color-changing medium and the metal matrix under the coating, so as to avoid increasing the metal corrosion effect. Disclosure of Invention The invention aims to solve the technical problems that: The existing thermochromic material has the problems of unstable color changing performance, poor stability and poor color changing durability, and the problems of toxicity and harm caused by adopting metal oxide and easy environmental pollution. The invention adopts the technical scheme for solving the technical problems: The invention provides a preparation method for preparing a thermally irreversible self-induced color-changing anticorrosive paint for thermal fault detection, which comprises the following steps: (1) Preparing a thermally irreversible self-induced color-changing filler; ① Adding nickel ammonium sulfate hexahydrate into the organic solvent A, and stirring until the mixture is uniform to obtain a mixed solution; ② Then adding a coloring agent and a color former into the mixed solution to form a colored mixed solution; ③ Adding ferrous ammonium sulfate hexahydrate into the colored mixed solution, uniformly mixing by ultrasonic, and drying in vacuum until the mixture is gelatinous to obtain a color-changing filler; (2) Adding graphene oxide into N, N-dimethylformamide dispersion liquid of nano titanium dioxide, and preparing titanium dioxide modified graphene oxide anticorrosive filler by adopting a hydrothermal method; (3) Preparing a thermally irreversible self-induced color-changing anticorrosive paint; ① Adding the color-changing filler prepared in the step (1) into the epoxy resin emulsion, and fully stirring to form a colored emulsion; ② Slowly adding the modified graphene oxide anticorrosive filler prepared in the step (2) into the colored emulsion, and continuously stirring and uniformly mixing to obtain an anticorrosive emulsion; ③ And adding a film forming auxiliary agent and a curing agent into the anti-corrosion emulsion, and uniformly mixing to obtain the thermally irreversible self-induced color-changing anti-corrosion coating. Further, the organic solvent a in step (1) ① is xylene, the colorant in step (1) ② is cobalt oxide, and the color former is crystal v