• 专利标题:   Modified graphene epoxy composite anticorrosive coating is prepared by adding modifier to graphene oxide for functional modification, adding hydrazine hydrate during reaction to obtain modified graphene, and mixing with aqueous epoxy resin.
  • 专利号:   CN112538304-A
  • 发明人:   ZHOU D, QIN Y, ZHAO J
  • 专利权人:   NANJING BOKE NEW MATERIAL IND RES INST
  • 国际专利分类:   C09D163/00, C09D005/08, C09D007/62
  • 专利详细信息:   CN112538304-A 23 Mar 2021 C09D-163/00 202139 Pages: 5 Chinese
  • 申请详细信息:   CN112538304-A CN10890925 20 Sep 2019
  • 优先权号:   CN10890925

▎ 摘  要

NOVELTY - A modified graphene epoxy composite anticorrosive coating is prepared by preparing graphene oxide by adopting improved Hummers method, then adding a modifier to the graphene oxide for functional modification, adding hydrazine hydrate during reaction to prepare a modified graphene, and mixing the modified graphene with aqueous epoxy resin. The mass ratio of graphene oxide to hydrazine hydrate is 2:1. The mass ratio of modifier to graphene oxide is (9-11):1. The modifier is hexamethylene diisocyanate or polyisocyanate. USE - Modified graphene epoxy composite anticorrosive coating. ADVANTAGE - The modified graphene epoxy composite anticorrosive coating: adopts functionally modified graphene, which has enhanced dispersibility and solubility in solvent, which solves the problem of easy agglomeration of graphene; improves uniform dispersion of graphene in the aqueous epoxy resin; enhances the interaction and compatibility between the graphene and the epoxy resin segment; and improves corrosion resistance of composite coating by introducing the modified graphene into the aqueous epoxy resin. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of the modified graphene epoxy composite anticorrosive coating, which involves: (1) preparing graphene oxide by placing a three-necked flask containing concentrated sulfuric acid in an ice water bath for 5 minutes, adding graphite powder, continuously reacting for 30 minutes, adding sodium nitrate, reacting for 30 minutes, adding potassium permanganate for deep oxidation, finally adding hydrogen peroxide for deepest oxidation to obtain a bright yellow solution, pouring into newly prepared hydrochloric acid solution, discarding supernatant, centrifuging lower product, washing, and drying; (2) preparing a functionally modified graphene by adding the graphene to a water-removed dimethylformamide beaker, transferring to an ultrasonic cleaner, oscillating for 40 minutes, when the graphene oxide is completely dissolved in dimethylformamide, transferring to the three-necked flask, adjusting the pH to 10, adding the modifier, then transferring the three-necked flask to a constant temperature water bath, setting the reaction temperature, reacting for 3 hours, adding hydrazine hydrate, continuously reacting, centrifuging the solution, removing the supernatant, washing the precipitate 3 times with dichloromethane, and drying in a constant temperature drying oven; and (3) adding the functionally modified graphene to N-methylpyrrolidone, dissolving, manually stirring with a glass rod for 5 minutes, then deeply dispersing and dissolving by using an ultrasonic instrument for 30 minutes, adding to the beaker containing aqueous epoxy resin, and stirring with a high-speed stirrer at 2500 rpm. The mass ratio of graphite powder, sodium nitrate and potassium permanganate is 2:1:6.