Preparation method of metharcylic acid, 2-isocyanatoethyl ester

The invention discloses a preparation method of a binder, namely, metharcylic acid, 2-isocyanatoethyl ester. The preparation method comprises the following steps of: (1) adding ethanol amine and an organic solvent into a reactor with a stirrer, a thermometer and a condensing tube, slowly dropping methylclhlorofonmate at 50-60 DEG C, and after dropping, continuously reacting for 2-4 hours; (2) adding a catalyst into the reactor, slowly dropping methylacryloyl at 80-100 DEG C, and after dropping, continuously reacting for 3-8 hours; (3) adding phosphorus pentachloride into the reactor to react at 50-100 DEG C and reacting for 48-72 hours; and (4) carrying out solid-liquid separation on the reactant obtained in step (3), depressurizing and distilling the filtrate, and collecting the fraction so as to obtain the metharcylic acid, 2-isocyanatoethyl ester. By utilizing the method, the generation of toxic phosgene in the production process is greatly reduced, so that potential safety hazard is reduced; the total yield is over 85%; and the whole process is generally free of environmental pollution.