GRAPHENE COMPOSITE MATERIAL AND METHOD OF PRODUCTION THEREOF Russian patent published in 2021 - IPC C08G63/183 C08G63/78 C08K7/18 C08K3/04 C08L67/02 C01B32/182 

FIELD: composite materials.

SUBSTANCE: invention relates to graphene composite materials. Proposed is a method of production of a nanocomposite material from graphene and PET is proposed, comprised of the steps of 1) spray drying a dispersion of single-layer graphene oxide producing crumpled spherical microgranules of graphene oxide, 2) mixing a mixture of terephthalic acid and ethylene glycol with the addition of sodium acetate with further esterification of the mixture, and 3) adding to the product of esterification from the step (2) of microgranules of graphene oxide and a catalyst produced at the step (1), holding with stirring for 1 to 3 hours, heating to 285°C and pumping out gases to continue the reaction until heat discharge from the system stops, and further granulating with cooling by water. When crumpled spherical microgranules of graphene oxide and catalyst are added to the precursor, the crumpled spherical microgranules of graphene oxide are easily dispersed and gradually dissociated into single-layer graphene oxide sheets during polycondensation, partially esterified molecules react with hydroxyl and carboxyl groups on the surface of graphene oxide sheets resulting in a chemical bond and graphene oxide is thermally reduced, wherein ultimately a composite material is produced comprised of PET and graphene sheets to the surface whereof PET is added. The method proposed by the present invention allows avoiding layering of graphene oxide at the stage of esterification, significantly reduces costs and increases productivity. The resulting graphene is easily dispersed in a polymer matrix and the formation of covalent bonds between the two materials effectively improves mechanical properties, electrical conductivity and other characteristics of the system.

EFFECT: proposed method of production of a nanocomposite material is simple, effective and economical, and the resulting composite material has excellent properties and can be used in manufacture of high-quality polyester fabrics.

7 cl, 7 dwg, 13 tbl, 9 ex