Method for making jute carbon-based composite coating

Patent metadata

Field	Value
Publication number	US-12528950-B2
Application number	US-202418916876-A
Country	US
Kind code	B2
Filing date	Oct 16, 2024
Priority date	Aug 26, 2022
Publication date	Jan 20, 2026
Grant date	Jan 20, 2026

Abstract

A method for producing a submicron-/nano-jute carbon/epoxy composite anti-corrosion coating is described. The method includes heating a jute stick, grinding the jute stick to form a first powder; pyrolyzing the first powder to form a pyrolyzed carbon; grinding the pyrolyzed carbon to form a second powder; ball milling the second powder under the wet conditions to form a submicron-/nano-jutecarbon; mixing the submicron-/nano-jutecarbon, and an epoxy resin to form a first mixture; mixing a hardener with the first mixture to form a second mixture, and coating the second mixture on a mild steel substrate and curing to form the submicron-/nano-jutecarbon/epoxy composite anti-corrosion coating.

First claim

The invention claimed is:

1 . A method for producing a composite coating, comprising:
heating a jute stick at a heating temperature in a range of from 60 to 150° C. for a heating time in a range of from 6 to 28 hours; grinding the jute stick to form a first powder; pyrolyzing the first powder at a pyrolyzing temperature in a range of from 500 to 1000° C. to form a pyrolyzed carbon; grinding the pyrolyzed carbon to form a second powder; ball milling the second powder at a rate a range of from 1500 to 5000 rpm for a milling time in a range of from 8 to 30 hours with ethanol to form a submicron/nano jute carbon; mixing the submicron/nano jute carbon, and an epoxy resin to form a first mixture; mixing a hardener with the first mixture to form a second mixture; and coating the second mixture on a mild steel substrate and curing to form a submicron/nano-jute carbon/epoxy composite anti-corrosion coating as a cured coating, wherein the cured coating comprises the submicron/nano-jute carbon and a remainder of the hardener and the epoxy resin, in cured form, wherein the epoxy resin comprises a glycidyl-ether, a glycidyl-ester, a glycidyl-amine, an aliphatic epoxy resin, and/or a cycloaliphatic epoxy resin, and wherein the hardener comprises an amine, a polyamide, a phenolic resin, an anhydride, an isocyanate, and/or a polymercaptan.

2 . The method of claim 1 , wherein the pyrolyzing time of the first powder in a range of from 3 to 10 hours.

3 . The method of claim 1 , wherein the second powder contains 92 to 97% C, 2.8 to 4.8% 0, 0.08 to 0.21% Mg, 1.1 to 2.1% Al, and 0.11 to 0.25% Ca.

4 . The method of claim 1 , wherein the second powder is ball milled as a mixture with ethanol.

5 . The method of claim 1 , wherein:
the second powder is ball milled with ZrO 2 balls having 400-800 micron diameters; and a mass ratio of the second powder to ZrO 2 balls is 1:30 to 1:10.

6 . The method of claim 1 , wherein:
the submicron/nano-jute carbon is amorphous; the submicron/nano-jute carbon has a mean particle size of 500 nm to 2 μm; and particles of the submicron/nano-jute carbon submicron/nano jute carbon have a major flat surface having a surface area of 2-40% of the total surface area of the particle.

7 . The method of claim 1 , wherein the first mixture comprises 0.1 to 2.0 wt. % of the submicron/nano-jute carbon relative to a total weight of the first mixture.

8 . The method of claim 1 , wherein the epoxy resin comprises the glycidyl-ester.

9 . The method of claim 1 , wherein the epoxy resin is a bisphenol A diglycidyl ether-based epoxy.

10 . The method of claim 1 , wherein the hardener comprises the amine.

11 . The method of claim 1 , wherein the hardener is a polyoxyalkylene amine-based hardener.

12 . The method of claim 1 , wherein a mass ratio of the first mixture to the hardener is 0.5:1.7 to 1.7:0.5.

13 . The method of claim 1 , wherein the submicron/nano-jute carbon/epoxy composite anti-corrosion coating has a mean thickness of 90 to 180 μm.

14 . The method of claim 1 , wherein the submicron/nano-jute carbon/epoxy composite anti-corrosion coating has a corrosion resistance of 10 6 to 10 12 Ωcm 2 .

15 . The method of claim 1 , wherein the submicron/nano-jute carbon/epoxy composite anti-corrosion coating has a corrosion current density of 0.5 to 1.5 nA/cm 2 .

16 . The method of claim 1 , wherein the submicron/nano jute carbon/epoxy composite anti-corrosion coating has 80 to 95% higher corrosion protection efficiency in comparison to an epoxy coating that is the same as the submicron/nano jute carbon/epoxy composite anti-corrosion coating but does not contain the submicron/nano jute carbon.

Assignees

• Univ King Fahd Pet & Minerals

Inventors

• Aziz Md Abdul
• Basha Shaik Inayath
• Maslehuddin Mohammed
• Ahmad Shamsad

Classifications

• C09D163/00 Primary

  Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins · CPC title

• C08G59/5006

  aliphatic · CPC title

• C08G59/245

  aromatic · CPC title

• C08K3/04

  Carbon · CPC title

• C09C3/041

  Grinding · CPC title