Trisiloxane polyether-ester surfactant as well as preparation method thereof

The invention discloses a trisiloxane polyether-ester surfactant. The trisiloxane polyether-ester surfactant prolongs the interval between siloxane and a hydrophilic group, and can effectively improve the hydrolysis resistance of siloxane. The surfactant provided by the invention has the structure of a structural formula I as shown in the specification, wherein R in the structural formula I refers to single functionality polyether ester. In the single functionality polyether ester structure, R1 refers to CH3, CH3CH2, CH3CH2CH2, CH(CH3)2 or CH3CH2CH2CH2; R2 refers to a saturated alkyl group formed by hydrosilylation of alpha-olefine acid or saturated fatty acid; the value of x is 20-120; the value of y is 0-75; double bonds in alpha-olefine acid or saturated fatty acid and hydrogen atoms in trisiloxane are subjected to hydrosilylation; the single functionality polyether ester of alpha-olefine acid or saturated fatty acid is connected to an organosilicone chain segment; the hydrophilic group is still polyether epoxy ethane, ethylene oxide or propylene oxide copolyether.