Adhesion properties of cement/epoxy interface using graphene-based nanomaterials

Patent metadata

Field	Value
Publication number	US-2025011249-A1
Application number	US-202318347998-A
Country	US
Kind code	A1
Filing date	Jul 6, 2023
Priority date	Jul 6, 2023
Publication date	Jan 9, 2025
Grant date	—

Abstract

A method for enhancing adhesion of a curable composition to a cement-based object includes applying a graphene oxide (GO) containing dispersion on a surface of the cement-based object thereby forming a GO-treated surface on the cement-based object. The method includes disposing the curable composition on the GO-treated surface of the cement-based object. The method includes curing the curable composition by heating thereby forming a GO interfacial layer and an epoxy resin layer. The GO interfacial layer is between the surface of the cement-based object and the epoxy resin layer. The curable composition includes an epoxy monomer and an amine curing agent. The GO interfacial layer has a thickness of from 0.1 to 10 nanometers (nm).

First claim

1 : A method for enhancing adhesion of a curable composition to a cement-based object, comprising:
applying a graphene oxide (GO) containing dispersion on a surface of the cement-based object thereby forming a GO-treated surface on the cement-based object; disposing the curable composition on the GO-treated surface of the cement-based object; and curing the curable composition by heating thereby forming a GO interfacial layer and an epoxy resin layer; wherein the GO interfacial layer is between the surface of the cement-based object and the epoxy resin layer; wherein the curable composition comprises an epoxy monomer and an amine curing agent; and wherein the GO interfacial layer has a thickness of from 0.1 to 10 nanometers (nm).

2 : The method of claim 1 , wherein the GO interfacial layer has a thickness of 0.2 to 2 nm.

3 : The method of claim 1 , wherein the GO interfacial layer has an oxygen coverage of 10 to 40% based on a total number of carbon atoms.

4 : The method of claim 1 , wherein the GO interfacial layer comprises GO particles having one or more functional groups selected from the group consisting of epoxide (—O—), hydroxyl (—OH), and carboxyl (—COOH); and wherein the cement-based object comprises hydrated calcium silicate (C—S—H) particles having one or more hydroxyl (—OH) groups.

5 : The method of claim 4 , wherein one or more hydrogen atoms in the hydroxyl groups of the hydrated calcium silicate (H CSH ) particles interact with one or more oxygen atoms of the epoxy resin layer (O EP ) and the GO interfacial layer (O GO ) resulting in the formation of one or more H CSH —O EP bonds and one or more H CSH —O GO bond.

6 : The method of claim 5 , wherein the one or more H CSH —O EP bonds have an average length of 1.95 to 2.05 angstroms (Å).

7 : The method of claim 5 , wherein the one or more H CSH —O GO bonds have an average length of 1.8 to 1.95 Å.

8 : The method of claim 4 , wherein one or more hydrogen atoms in the hydroxyl groups of the hydrated calcium silicate (H CSH ) particles interact with one or more carbon atoms of the GO interfacial layer (C GO ) resulting in the formation of one or more H CSH —C GO bonds.

9 : The method of claim 8 , wherein the one or more H CSH —C GO bonds have an average length of 3.5 to 3.6 Å.

10 : The method of claim 4 , wherein one or more oxygen atoms of the epoxy resin layer (O EP ) interact with one or more oxygen atoms of the GO interfacial layer (O GO ) resulting in the formation of one or more O EP —O GO bonds.

11 : The method of claim 10 , wherein the one or more O EP —O GO bonds have an average length of 3 to 3.1 Å.

12 : The method of claim 1 , wherein a mole ratio of the epoxy monomer to the amine curing agent is in a range of 5:1 to 1:1.

13 : The method of claim 1 , wherein after the curing the epoxy resin of the epoxy resin layer has a cross-linking degree of 60 to 95% based on a total number of the epoxy monomer and the amine curing agent.

14 : The method of claim 1 , wherein the epoxy monomer is a polyhydric phenol glycidyl ether, and wherein the polyhydric phenol glycidyl ether comprises diglycidyl ether bisphenol-A (DGEBA).

15 : The method of claim 1 , wherein the amine curing agent is a phenylenediamine, and wherein the phenylenediamine comprises m-phenylenediamine (m-PDA).

16 : The method of claim 1 , wherein a weight ratio of the GO interfacial layer to the epoxy resin layer is in a range of 1:200 to 1:10.

17 : The method of claim 1 , wherein the adhesion of the epoxy resin layer formed from the curable composition to the cement-based object is improved compared to that of an epoxy resin layer formed from a composition in the absence of the GO when exposed to a condition selected from the group consisting of a dry condition, a wet condition, and a salt-containing condition, wherein the epoxy resin layer has a water diffusion coefficient of 0.05×10 −12 to 0.09×10 −12 meter square per second (m 2 ·s −1 ), and wherein the epoxy resin layer has a chloride ions diffusion coefficient of 0.04×10 −12 to 0.13×10 −12 m 2 ·s −1 .

18 : A method for enhancing adhesion of a graphene (GR) containing composition to a cement-based object, comprising:
mixing an epoxy monomer, an amine curing agent, and a GR nanomaterial to form the GR-containing composition; disposing the GR-containing composition on a surface of the cement-based object; and curing the GR-containing composition by heating thereby forming a modified epoxy resin layer on the surface of the cement-based object; and wherein the GR nanomaterial has a thickness of 0.2 to 1 nm; and wherein the GR nanomaterial is present in the GR-containing composition at a concentration of 0.01 to 10 wt. % by weight.

19 : The method of claim 18 , wherein one or more hydrogen atoms in the hydroxyl groups of the hydrated calcium silicate (H CSH ) particles of the cement-based object interact with one or more carbon atoms of the GR nanomaterial in the modified epoxy resin (C GR ) resulting in the formation of one or more H CSH —C GR bonds.

20 : The method of claim 19 , wherein the one or more H CSH —C GR bonds have an average length of 2.5 to 2.6 Å.

Assignees

• Univ King Fahd Pet & Minerals

Inventors

• Bahraq Ashraf Awadh
• Alosta Mohammed Ali
• Obot Ime Bassey
• Al-Amoudi Omar Saeed Baghabra
• Awadh Tawfik Abdo Saleh
• Maslehuddin Mohammed

Classifications

• C04B41/63

  Macromolecular compounds · CPC title

• C04B41/4853

  Epoxides · CPC title

• C04B41/71

  at least one coating being an organic material · CPC title

• C04B41/009

  characterised by the material treated · CPC title

• C04B41/52

  Multiple coating or impregnating {multiple coating or impregnating with the same composition or with compositions only differing in the concentration of the constituents, is classified as single coating or impregnation} · CPC title