Self-emulsifying molecular antifoaming agent and preparation method thereof

Abstract

The invention discloses a self-emulsifying molecular antifoaming agent and a preparation method thereof. The antifoaming agent comprises the following components in percent by mass: 20 to 60 percent of antifoaming active substance and 40 to 80 percent of dispersion medium, wherein the antifoaming active substance consists of higher fatty alcohol, alkynol, polyether and silicone oil in a mass ratio of 1:(0.8-1.5):(2-3):(2-4); and the dispersion medium is grafted star polymer. The preparation method comprises the following steps of: adding 50 to 150 parts of trichloromethane and 1 to 2 parts ofp-methyl benzene sulfonic chloride into 20 to 60 mass parts of active substance and 40 to 80 mass parts of star polymer, raising the temperature to between 40 and 70 DEG C, and reacting for 3 to 6 hours; and after the reaction is finished, washing sodium carbonate until the ph is 7, drying by using anhydrous sodium sulfate, and evaporating the solvent under reduced pressure to obtain the antifoaming agent. The extended arm of the star polymer in the antifoaming agent is grafted with the active substance, so that various components are synergistic, and the obtained antifoaming agent is high instability, low in surface tension, high in surface activity, high in antifoaming capacity, long in foam inhibition time and small in dosage.

Description

technical field [0001] The invention relates to a defoamer and a preparation method thereof, in particular to a self-emulsifying molecular-level defoamer applied to star-shaped polymers and a preparation method thereof. Background technique [0002] There are many types of defoamers on the market, including low-carbon alcohols, mineral oils, organic polar compounds, and silicone resins. In comparison, silicone-based defoamers are considered to be highly effective defoamers in aqueous systems. At present, there are many patents on defoamers for water-based systems at home and abroad, such as CN1919936A, US6686320, CN1676544, etc., all of which are silicone or silicon polyether defoamers, as well as mineral oil defoamers. While known defoamers are well utilized to suppress and eliminate foam in water-based systems, there are some unmet or unfulfilled requirements such that such defoamers are not compatible with the aqueous phase To achieve the purpose of defoaming, if the tr...

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Problems solved by technology

Most of the current research uses small molecule polyhydric alcohols, derivatives of inorganic (heterocyclic) compounds, metal organic compounds, derivatives of polyphenols, etc. as the "core", and s-PLA is obtained by ring-opening polymerization of lactide. The advantage is that the molecular weight of the product can be controlled by the molar ratio of the initiator to the monomer. However, there is no relevant literature on the use of star polylactic acid as a defoamer.

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