Zhang, etc. The mineral oil, vegeta

Zhang, etc. The mineral oil, vegetable silica was added to prepare a mixture of a mineral oil defoamer silicone oil in the alkyl group. To increase compatibility with mineral oil, alkyl silicone oil is required to control the carbon chain length. Studies have shown that, m (vegetable oils and their derivatives) :m (mineral oil) = (7:4) ~ (6:1), defoamers defoaming properties and good stability, Furthermore, cissing, craters, cissing and other defects can be improved. Li Weige like stearate or modified stearate, emulsifiers silica in mineral oil was added, heating and stirring the system was raised to substantially transparent, heat about 1.5 h; after cooling to prepare a dispersion of milled mineral oil defoamers. To ensure the mineral oil defoaming agent having defoaming effect and good dispersion; selecting the proper stearate and stearate modified varieties experiment, this new aqueous mineral oil is excellent in antifoaming property and safety, environmentally friendly, simple manufacturing process. Defoaming performance in a variety of water-based paint have had a very good performance, but also large-scale production. Currently, the mineral oil defoaming agent larger market share, the highest price, but mainly used in high PVC primer, flat and semigloss systems, and anti-foaming and foam breaking effect is less than polyethers and silicone-based antifoam agents. Alkyl silicone oil or the like is added silica was modified to improve their defoaming performance, enhance stability; improved effects on film gloss of such research is defoamer.