Pyriminobac-methyl, quinclorac and cyhalofop-butyl compounded suspension agent and preparation method thereof

The invention discloses a pyriminobac-methyl, quinclorac and cyhalofop-butyl compounded suspension agent and a preparation method thereof, and relates to the technical field of prevention and control of annual grassy weeds in direct sowing rice fields. Based on the total amount of 100 parts, the pyriminobac-methyl, quinclorac and cyhalofop-butyl compounded suspension agent is at least prepared from 5 parts of pyriminobac-methyl, 20 parts of quinclorac, 15 parts of cyhalofop-butyl, 3 parts of fatty alcohol polyoxyethylene ether, 5 parts of styryl phenol polyoxyethylene ether, 0.5 part of xanthan gum, 0.5 part of sodium benzoate, 0.5 part of an antifoaming agent and the balance of de-ionized water. The preparation method comprises the following steps: pumping the raw materials into a preparation kettle, performing mixing and stirring, performing preliminary grinding by virtue of a colloid grinder, performing fine grinding by virtue of a sander, taking a sample for analysis, and if the sample is qualified, perfo