PROCESS FOR PREPARING COMPLETELY DELAMINATED GRAPHENE OXIDE/RUBBER NANOCOMPOSITE

摘要

A process for preparing a completely delaminated graphene oxide/rubber nanocomposite. The process combines emulsion compounding with flocculation or spray drying, retains the morphology of graphene oxide/rubber composite in a liquid state, and achieves highly dispersed and highly delaminated morphology dispersed on nano scale. Furthermore, a substance able to produce ionic bonding or chemical bonding with the surface functional groups of graphene oxide is added to graphene oxide/hydrosol, as a surfactant, thus the interfacial bonding between graphene oxide and the rubber is increased. The composite is subjected to subsequent compounding and vulcanization to prepare a vulcanizate with dynamic performance, such as a high tensile strength, stress at a definite elongation, tearing strength, etc.

主权项

1. A method of preparing a delaminated graphene oxide/rubber nanocomposite, the method comprising:
(1) preparing a graphene oxide/water sol comprising dispersing graphene oxide in deionized water, and treating by ultrasonic waves at a power of 10-2000 W, and at a frequency of 10-20000 Hz, for 10 min-6 h at a temperature of 0-100° C., to obtain the graphene oxide/water sol; (2) pretreating the graphene oxide/water sol comprising adding a surfactant to the graphene oxide/water sol, treating by ultrasonic waves for 5 min-5 h or stirring for 5 min-5 h at a stirring speed of 50-10000 r/min to obtain a pretreated graphene oxide/water dispersion; (3) preparing a graphene oxide/rubber compounding emulsion comprising treating the graphene oxide/water sol or the graphene oxide/water dispersion in addition to a rubber latex by ultrasonic waves for 10 min-6 h, or stirring the graphene oxide/water sol or the graphene oxide/water dispersion in addition to the rubber latex for 10 min-6 h at a stirring speed of 50-10000 r/min, to obtain a stabilized graphene oxide/rubber compounding emulsion; (4) preparing the graphene oxide/rubber nanocomposite comprising selecting one of the following processes to prepare the graphene oxide/rubber nanocomposite:
A) ion flocculation process comprising adding a flocculant which demulsifies the graphene oxide/rubber compounding emulsion to perform flocculation, dehydrating and drying a flocculate of the flocculation to obtain the graphene oxide/rubber nanocomposite; andB) spray drying process comprising passing the graphene oxide/rubber compounding emulsion through a spray drier to produce small composite liquid drops, and dehydrating the composite liquid drops in a drying medium to obtain the graphene oxide/rubber nanocomposite; or adding a gasified flocculant to the drying medium of the spray drier to simultaneously perform flocculation and dehydration to obtain the graphene oxide/rubber nanocomposite.