Defoaming agent, as well as preparation method and application thereof

The invention relates to the technical field of paper-making chemicals, and particularly relates to a defoaming agent, as well as a preparation method and application thereof. The defoaming agent is prepared from the following components in parts by weight: 5-10 parts of mineral oil, 30-140 parts of low molecular polymer, 3-11 parts of inorganic filler, 1-5 parts of vinyltris(methylethylketoximino)silane, 1-5 parts of polyether modified silicone oil, 7.5-27.5 parts of emulsifier, 0.5-1 part of emulsion stabilizer and 200-300 parts of water, wherein the low molecular polymer comprises poly-1-butene and polyisobutene, and has a number-average molar mass of 200-1300. The defoaming agent prepared by using the mineral oil, inorganic filler and low molecular polymer as main bodies has excellentdefoaming and foam-inhibiting effects, low cost and small dosage under common effects of the vinyltris(methylethylketoximino)silane, polyether modified silicone oil, emulsifier and emulsion stabilizer, and can be applied to p