Grinding and dispersing preparation of dispersed mineral oil defoamers. In order to ensure that the mineral oil defoaming agent has the effect of defoaming and good dispersion, choose the appropriate stearate and steara acid modified varieties for testing, the new water-based mineral oil has excellent defoaming performance, safety, environmental protection, simple production process and other advantages. The defoaming properties are well performed in a variety of water-based coatings, and can also be produced on a large scale. At present, mineral oil defoaming agent market share is large, the highest cost-effective, but mainly used for high PVC primer, flat light and half-light system, and the defoaming and foaming effect is not as polyether and silicone-based defoaming agent. Add silicone oil for modification to improve its defoaming performance and enhance stability