Search

CN-121975424-A - Anti-aging building coating and preparation method thereof

CN121975424ACN 121975424 ACN121975424 ACN 121975424ACN-121975424-A

Abstract

The invention discloses an anti-aging building coating and a preparation method thereof, and relates to the field of coating preparation, and the preparation method of the anti-aging building coating comprises the following steps of chemically modifying original graphene oxide to obtain modified graphene oxide with carbon-carbon double bonds, purifying and drying the modified graphene oxide to obtain polymerizable graphene oxide, and preparing graphene oxide water dispersion slurry according to the polymerizable graphene oxide; preparing a base material according to the graphene oxide water dispersion slurry, preparing a curing agent at the same time, and stirring the base material and the curing agent when the coating is used to obtain the anti-aging building coating. According to the invention, the original graphene oxide is subjected to chemical modification to introduce carbon-carbon double bonds, so that polymerizable graphene oxide is obtained, water-dispersible slurry is prepared, and then the polymerizable graphene oxide is combined with a base material and a curing agent.

Inventors

  • DENG LEI
  • ZENG TIANYING
  • HUANG WENTING

Assignees

  • 广东政和工程有限公司

Dates

Publication Date
20260505
Application Date
20260304

Claims (10)

  1. 1. The preparation method of the anti-aging building coating is characterized by comprising the following steps of: S1, chemically modifying original graphene oxide to obtain modified graphene oxide with carbon-carbon double bonds, purifying and drying the modified graphene oxide to obtain polymerizable graphene oxide, and preparing graphene oxide water dispersion slurry according to the polymerizable graphene oxide; And S2, preparing a base material according to the graphene oxide water dispersion slurry, preparing a curing agent at the same time, and stirring the base material and the curing agent when the coating is used to obtain the anti-aging building coating.
  2. 2. The method for preparing the anti-aging building coating according to claim 1, wherein, The modified graphene oxide is obtained according to the following steps: Stirring the solvent a and the original graphene oxide in a container, carrying out ultrasonic treatment on the container and the materials in the container for 45-75min at 250-350W and 40kHz, adding a grafting monomer, a catalyst a and a polymerization inhibitor into the container after the treatment is finished, heating the materials in the container to a first temperature in a nitrogen environment, stirring at 150-250rpm for 22-26h, and converting the original graphene oxide in the dispersion liquid into modified graphene oxide after the reaction is finished.
  3. 3. A process for preparing an anti-aging architectural coating according to claim 2, wherein, The solvent a is an N-methylpyrrolidone solvent, the grafting monomer is glycidyl methacrylate, the catalyst a is p-toluenesulfonic acid, and the polymerization inhibitor is hydroquinone; the first temperature is 80-90 ℃, the mass ratio of the solvent a to the original graphene oxide is (90-110): 1, the mass ratio of the grafting monomer to the original graphene oxide is (4-6): 1, and the mass ratio of the catalyst a to the grafting monomer is 1 (80-120).
  4. 4. A process for preparing an anti-aging architectural coating according to claim 3, The polymerizable graphene oxide is obtained according to the following steps: cooling the dispersion liquid to room temperature, stirring the dispersion liquid and an ethanol mixed solvent, centrifuging at 4000-6000rpm for 25-35min to obtain clear liquid and precipitate after centrifugation is finished, stirring the precipitate and ethanol, washing the precipitate with ultrasonic waves, centrifuging, repeating the washing and centrifuging process for more than or equal to 3 times, and vacuum drying the washed and centrifuged precipitate at a second temperature for more than or equal to 24h to obtain the polymerizable graphene oxide after the drying is finished.
  5. 5. The method for preparing an anti-aging building coating according to claim 4, wherein, The volume ratio of the dispersion liquid to the ethanol mixed solvent is 1 (8-12), the ethanol mixed solvent comprises ethanol and deionized water, the ethanol accounts for 70-90% of the volume of the ethanol mixed solvent, the other is deionized water, and the second temperature is 55-65 ℃.
  6. 6. The method for preparing an anti-aging building coating according to claim 5, wherein, The graphene oxide water dispersion slurry is obtained according to the following steps: And stirring the polymerizable graphene oxide, deionized water and a dispersing agent a at 4500-5500rpm for 25-35min, and obtaining graphene oxide water dispersion slurry after stirring is completed.
  7. 7. The method for preparing an anti-aging building coating according to claim 6, wherein, The dispersing agent a is sodium polyacrylate, the solid content of the graphene oxide water dispersion slurry is 8.0-12.0%, and the mass ratio of the polymerizable graphene oxide to deionized water to the dispersing agent a is 1 (8-10) (0.05-0.1).
  8. 8. The method for preparing the anti-aging building coating according to claim 1, wherein, The anti-aging building coating is obtained according to the following steps: Stirring a water-based resin material, graphene oxide water-dispersible slurry, a reactive ultraviolet absorbing monomer, a polyfunctional crosslinking monomer, a defoaming agent and a dispersing agent b at 350-450rpm for 25-35min, adding deionized water after stirring is finished to adjust the viscosity until the measured value of a coating-4 cup is 80-100s, and obtaining a base material; wherein the curing agent comprises an oxidant, a reducing agent and a catalyst b.
  9. 9. The method for preparing an anti-aging building coating according to claim 8, wherein, The aqueous resin material is an aqueous acrylic ester/polyurethane heterozygous dispersion with double bonds, the reactive ultraviolet absorbing monomer is 2- (2H-benzotriazole-2-yl) -4-methyl-6- (2-propenyl) phenol, the polyfunctional crosslinking monomer is pentaerythritol triacrylate, the defoamer is polyether modified siloxane defoamer, the dispersant b is sodium polyacrylate, and the mass ratio of the base material to the curing agent is (8-12): 1; The oxidant is tert-butyl hydroperoxide, the reducing agent is ascorbic acid, and the catalyst b is an organic cobalt-amine composite catalyst, wherein the organic cobalt-amine composite catalyst consists of cobalt (III) acetylacetonate and N, N-dimethyl-p-toluidine, and the mass ratio of the cobalt (III) acetylacetonate to the N, N-dimethyl-p-toluidine is (1.5-4): 1.
  10. 10. An anti-aging building coating, characterized in that the anti-aging building coating is prepared by the preparation method according to any one of claims 1 to 9; the anti-aging building coating is applied by taking out the base material and the curing agent according to the mass ratio (8-12) 1, rapidly stirring manually or mechanically in a container for 1-3min until the base material and the curing agent are completely and uniformly stirred, immediately adopting a roller coating, brushing or spraying mode, applying the stirred coating on the surface of a clean and dry base material, controlling the thickness of a wet film to be 120-180 mu m, standing and curing the coated workpiece in an environment with room temperature and 40-70% of relative humidity, and completely curing the coating after 5-10 days.

Description

Anti-aging building coating and preparation method thereof Technical Field The invention relates to the field of paint preparation, in particular to an anti-aging building paint and a preparation method thereof. Background The building coating is a protective layer coated on the surface of a building, and forms a continuous film to resist the corrosion of moisture, ultraviolet rays and pollutants, has the functions of decoration and protection, has crucial anti-aging performance, and is easy to fade and crack due to poor weather resistance, thereby accelerating the damage of the building. The Chinese patent application No. 202410881726.4, no. 2024, no. 07 and No. 03 discloses an anti-aging water-based paint and a preparation method thereof, and relates to the technical field of water-based paint, wherein the anti-aging water-based paint comprises the following raw materials in parts by weight, 100 parts of water-based epoxy resin emulsion and 40 parts of water-based curing agent60 Parts of curing agent 13 Parts of dispersant 12 Parts of modified anti-aging agent 24 Parts of deionized water 80150 Parts of the first-generation polymer is prepared by urotropine and para-aminophenol, and then the first-generation polymer is mixed with glycidyl methacrylate and 2 parts of the first-generation polymer(2HBenzotriazole compounds2Base group4Methyl group6(2Propenyl) phenol graft copolymerization to prepare a novel polymer, and modifying the polymer by graphene oxide to obtain a modified anti-aging agent for anti-aging of the coating, wherein the anti-aging water-based coating prepared by the anti-aging water-based coating and the preparation method thereof have excellent anti-ultraviolet aging performance. In the anti-aging water-based paint and the preparation method thereof, although the prepared anti-aging water-based paint has excellent anti-ultraviolet aging performance, certain defects exist in the preparation process, for example, the method has the advantages that the graphene oxide is only subjected to physical shearing and polymer stirring, the long-term dispersion stability and firm bonding of the graphene oxide in a paint system are still poor, particularly, the graphene oxide sheets are strong in interlayer acting force and large in specific surface area, long-term uniform dispersion of the graphene oxide sheets in a resin system is difficult to realize by virtue of shearing force, re-agglomeration is extremely easy to occur in the storage and curing process, stress defects are formed in the paint, the graphene oxide and the polymer lack of firm chemical bonding, interface bonding force is weak, interface peeling is easy to occur under the effects of long-term damp heat, ultraviolet aging or mechanical stress, the reinforcing effect of the graphene oxide cannot be fully exerted, and early pulverization, peeling and reduction of protective performance of the paint are possibly caused. Therefore, an anti-aging building coating and a preparation method thereof are provided for solving the problem that the long-term dispersion stability and firm bonding of graphene oxide in a coating system are still poor. Disclosure of Invention The invention aims to provide an anti-aging building coating and a preparation method thereof, which solve the problem that the long-term dispersion stability and firm combination of graphene oxide in a coating system are still poor. To achieve the purpose, the invention adopts the following technical scheme: A method for preparing an anti-aging architectural coating, the method comprising the steps of: S1, chemically modifying original graphene oxide to obtain modified graphene oxide with carbon-carbon double bonds, purifying and drying the modified graphene oxide to obtain polymerizable graphene oxide, and preparing graphene oxide water dispersion slurry according to the polymerizable graphene oxide; And S2, preparing a base material according to the graphene oxide water dispersion slurry, preparing a curing agent at the same time, and stirring the base material and the curing agent when the coating is used to obtain the anti-aging building coating. The modified graphene oxide is obtained according to the following steps: Stirring the solvent a and the original graphene oxide in a container, carrying out ultrasonic treatment on the container and the materials in the container for 45-75min at 250-350W and 40kHz, adding a grafting monomer, a catalyst a and a polymerization inhibitor into the container after the treatment is finished, heating the materials in the container to a first temperature in a nitrogen environment, stirring at 150-250rpm for 22-26h, and converting the original graphene oxide in the dispersion liquid into modified graphene oxide after the reaction is finished. The solvent a is an N-methylpyrrolidone solvent, the grafting monomer is glycidyl methacrylate, the catalyst a is p-toluenesulfonic acid, and the polymerization inhibitor is hydroquinone; the first temper