High-temperature-resistant and high-pressure-resistant organic silicon defoaming agent and preparation method thereof

The invention discloses a high-temperature-resistant and high-pressure-resistant organic silicon defoaming agent and a preparation method thereof, and the high-temperature-resistant and high-pressure-resistant organic silicon defoaming agent is prepared from the following components in percentage by weight: 5%-55% of polysiloxane silicon paste, 0.1%-10% of spherical polysilsesquioxane, 0.3%-25% of polyether modified polysiloxane, 1%-25% of an emulsifier, 0.1%-5% of a thickening agent, 0.05%-0.3% of a bactericide and the balance of water, the sum of the weight percentages of the components is 100%. In the formula, the cross-linked polysiloxane silicon paste provides more excellent foam elimination and inhibition performance, the spherical polysilsesquioxane has excellent thermal stability and chemical stability, and the wrapped silicon paste is protected from being separated out in the emulsion through the 3D structure of the spherical polysilsesquioxane, so that the stability of the defoaming agent is improve