▎ 摘　　要

NOVELTY - Temperature-resistant and salt-resistant nano-surfactant (I), comprises salt-resistant functional group, ionic hydrophilic group, and hydrophilic nanomaterial group grafted on the hydroxy end of the ionic hydrophilic group. USE - The temperature-resistant and salt-resistant nano-surfactant is useful in high temperature and high salt reservoir oil surfactant agent and foaming agent (claimed). ADVANTAGE - The temperature-resistant and salt-resistant nano-surfactant has ionic and non-ionic surfactant properties, and improves temperature resistance and foam stabilizing performance. DETAILED DESCRIPTION - Temperature-resistant and salt-resistant nano-surfactant of formula (I), comprises salt-resistant functional group, ionic hydrophilic group, and hydrophilic nanomaterial group grafted on the hydroxy end of the ionic hydrophilic group. R = alcohol, alkylphenol, or castor oil group. An INDEPENDENT CLAIM is also included for preparing nano-surfactant, comprising (i) performing esterification reaction of the mixed solution containing non-ionic polyoxyethylene ether monomer, ionic maleic anhydride monomer, and catalyst to obtain product one, (ii) modifying the mixed solution containing product one, hydrophilic nanomaterial group, and catalyst to obtain product two, and (iii) sulfonating the mixed solution containing product two, and sulfonating agent to obtain final product.