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Preparation method of high-corrosion-resistance modified epoxy resin composite coating

A technology of epoxy resin and composite coating, used in epoxy resin coatings, coatings, anti-corrosion coatings, etc., can solve problems such as structural defects, and achieve the effect of increasing crosslinking density, promoting protective performance, and increasing quantity

Active Publication Date: 2021-02-09
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to curing shrinkage, epoxy coatings tend to form structural defects inside the coating, which are channels for the penetration of corrosive media and easily induce metal corrosion.

Method used

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  • Preparation method of high-corrosion-resistance modified epoxy resin composite coating
  • Preparation method of high-corrosion-resistance modified epoxy resin composite coating
  • Preparation method of high-corrosion-resistance modified epoxy resin composite coating

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preparation example Construction

[0025] A preparation method for a highly corrosion-resistant modified epoxy resin composite coating, comprising the following steps:

[0026] (1) Preparation of MOF nanomaterials: Dissolve the metal salt and imidazole ligand in anhydrous methanol, stir for 2-3 hours to obtain a white emulsion, centrifuge to obtain a white solid, and then alternately wash with methanol and deionized water for 3-3 hours 5 times, and then vacuum-dried at 60-80°C to obtain white powdery MOF nanomaterials;

[0027] Metal-Organic Framework (MOF for short) is a porous crystal material formed by metal ion clusters and inorganic ligands or organic ligands under certain conditions. The MOF nano material of the invention is prepared by using imidazole ligand and metal salt as raw materials. In the present invention, the diversification of imidazole ligands is utilized, and the size of the MOF material and the amount of active hydrogen are regulated by using imidazole ligands with benzene rings and amino...

Embodiment 1

[0045] (1) Preparation of ZIF-8 material: 0.5g Zn(NO 3 ) 2 ·6H 2O and 0.55g 2-methylimidazole were dissolved in 50ml of anhydrous methanol, wherein the molar ratio of zinc ions and 2-methylimidazole was 1:4, stirred at room temperature on a magnetic stirrer for 2h, and the obtained white emulsion, Then centrifuged and alternately washed 4 times with anhydrous methanol and deionized water to obtain a white solid, and finally dried the obtained white solid at 70° C. for 12 hours to obtain ZIF-8 in the form of white powder;

[0046] (2) Preparation of modified epoxy resin: mixing epoxy resin, ZIF-8 and diluent with a mass ratio of 10:0.5:8, wherein the diluent is a mixture of xylene and n-butanol, and xylene and n-butyl The mass ratio of alcohol is 2:1; ball mill and stir for 0.5h, then add 80g of polyamide 650 curing agent for every 100g of epoxy resin E-44, stir for 10min, mix well and then vacuumize to obtain modified epoxy resin;

[0047] (3) Coating film: apply the modifi...

Embodiment 2

[0057] (1) Preparation of aminated ZIF-8 material: 0.5g Zn(NO 3 ) 2 ·6H 2 O, 0.3g 2-methylimidazole and 0.4g 2-aminobenzimidazole were dissolved in 50ml of anhydrous methanol. At this time, the molar ratio of zinc ion and imidazole group was 1:4, and stirred at room temperature on a magnetic stirrer for 3h, The obtained white emulsion was centrifuged and washed alternately with anhydrous methanol and deionized water for 4 times to obtain a white solid, and finally the obtained white solid was dried at 70° C. for 12 hours to obtain white powdered aminated ZIF-8;

[0058] (2) Aminated ZIF-8 modified epoxy resin: mix epoxy resin, aminated ZIF-8 and diluent with a mass ratio of 10:2:8.5, wherein the diluent is a mixture of xylene and n-butanol , and the mass ratio of xylene and n-butanol is 2:1; the ball mill is stirred for 0.5h, and then 25g of polyamide 651 curing agent is added for every 100g of epoxy resin E-51, stirred for 10min, mixed evenly and vacuumized to obtain the im...

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Abstract

The invention discloses a preparation method of a high-corrosion-resistance modified epoxy resin composite coating, which comprises the following steps: dissolving a metal salt and an imidazole ligandin absolute methanol, conducting stirring for 2-3 hours to obtain a white emulsion, carrying out centrifugal separation to obtain a white solid, alternately conducting washing with methanol and deionized water for 3-5 times, and carrying out vacuum drying at 60-80 DEG C to obtain a white powdery MOF nanometer material; mixing epoxy resin, the MOF nano material and a diluent, carrying out ball milling and stirring for 0.5-5 h, adding a curing agent, and conducting uniform mixing to obtain modified epoxy resin; coating the surface of a pretreated metal matrix with the modified epoxy resin, andconducting drying and curing to obtain the MOF modified epoxy resin composite coating on the surface of the metal matrix. According to the method, the epoxy resin is modified by the MOF nano material,so that the MOF nano material and the epoxy resin are chemically bonded, the problem of interfacial compatibility between the filler and the epoxy resin is solved, and the corrosion resistance and mechanical properties of the epoxy resin coating are improved.

Description

technical field [0001] The invention belongs to the technical field of anti-corrosion materials in marine environments, and in particular relates to a preparation method of a high-corrosion-resistant modified epoxy resin composite coating. Background technique [0002] The marine environment is a typical area with high humidity, high temperature, high salt spray, and high radiation. Therefore, mechanical equipment in the marine environment has very strict requirements on corrosion resistance. [0003] At present, organic coating is one of the most important anti-corrosion methods in the marine field. Epoxy resin coatings have become the most widely used coatings in the marine field due to their excellent mechanical properties, excellent adhesion to the substrate, good corrosion resistance, and low cost. However, due to curing shrinkage, epoxy coatings tend to form structural defects inside the coating, which are channels for the penetration of corrosive media and easily ind...

Claims

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Application Information

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IPC IPC(8): C09D163/00C09D5/08C08G83/00B82Y30/00B82Y40/00
CPCC09D163/00C09D5/08C08G83/008B82Y30/00B82Y40/00C08L87/00
Inventor 林修洲段松窦宝捷张颖君孙翠玲方治文高秀磊
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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