Method for testing sulfur distribution of ethoxysilane coupling agent by high performance liquid chromatography-mass spectrometer

The invention relates to the application field of industries of tires, rubber products and the like, in particular to a method for testing sulfur distribution of an ethoxysilane coupling agent by a high performance liquid chromatography-mass spectrometer. The method comprises the following steps: 1) a mobile phase is acetonitrile/aqueous solution with a ratio of 97/3; the column temperature is 40 DEG C; an ultraviolet detector is adopted for liquid chromatography, and the detection wavelength is 254 nm; a chromatographic column is a C18 rapid column; the flow velocity is 0.1 to 0.3 ml/min; 2) mass spectrum conditions: ion trap mass spectrum: ESI source positive ion detection; the mass scanning range is m/z 50-1000; and (3) filtering an ethoxysilane coupling agent sample to be detected through a 0.22 mu m filter membrane, injecting 5-10 mu l of solution by using an automatic sampler, determining a liquid chromatogram according to conditions, and determining components with different sulfur contents according t