Amphiphilic graphene oxide temperature-resistant foam stabilizer for maintaining wide ph range and preparation method thereof

An amphiphilic graphene oxide temperature-resistant foam stabilizer for maintaining a wide pH range, produced by the following steps, wherein all raw materials are in parts by mass:

• step (1), adding 1-2 parts of graphene oxide into 1000-2000 parts of deionized water, and ultrasonically dispersing the mixture in an ice water bath for 1 h to yield a graphene oxide dispersion liquid;
• step (2), weighing and heating 30-40 parts of solid paraffin to a liquid state to 70° C., sequentially adding 55 parts of a liquid paraffin, 1 part of an emulsifier OP-10, and 10 parts of an intercalation agent cetyltrimethylammonium bromide into the graphene oxide dispersion liquid obtained in step (1), and emulsifying the mixture with an emulsifier at 10,000 rad/min for 20 min;
• after the emulsification is completed, placing the mixture in the ice water bath to solidify paraffin microspheres, wherein graphene oxide sufficiently coats a surface of paraffin microspheres, and obtaining graphene oxide-coated paraffin microspheres by removing free graphene oxide, cetyltrimethylammonium bromide and OP-10 via filtration and washing;
• step (3), adding 1 part of 36.5% concentrated hydrochloric acid into 300 parts of an absolute ethanol, stirring uniformly, adding 1-3 parts of a silane coupling agent, and hydrolyzing for 15 min to yield a hydrolyzate of the silane coupling agent, transferring the yielded hydrolyzate of the silane coupling agent and the graphene oxide-coated paraffin microspheres prepared in the step (2) into a three-necked flask and reacting for 48-72 h at 30° C. with a stirring speed of 300 rad/min, thus allowing hydroxyl groups on outer sides of the graphene oxide sheets coated on the surface of the paraffin microspheres to couple with silanol groups of the hydrolyzed silane coupling agent, and yielding an intermediate 1 dispersion liquid;
• step (4), adding 3-4 parts of a diethylenetriamine (DETA) into the intermediate 1 dispersion liquid obtained in the step (3) as an amino modifier, performing a ring opening reaction between primary amine groups of the amino modifier and epoxy groups on the graphene oxide modified by a silane coupling agent KH-560;
• after reacting for 3-5 h, cooling the mixture to a normal temperature, and then suction filtering, yielding amphiphilic graphene oxide-coated paraffin microspheres;
• wherein a structural formula of the silane coupling agent KH-560 is:
• wherein R is a methyl, and a structural formula of KH-560 hydrolysate is
• and
• step (5), fully dissolving the amphiphilic graphene oxide-coated paraffin microspheres obtained in step (4) in 100 parts of a chloroform, centrifugally washing with 100 mL of ethanol solution for 6 times, and freeze-drying for 48 h, and yielding the amphiphilic graphene oxide temperature-resistant foam stabilizer as a final product.