US 2016/0107103 A1 · BIODIESEL-BASED EMULSION DEFOAMER AND METHOD FOR MAKING THE SAME

Abstract

Disclosed are an oil-in-water emulsion defoamer and a method for preparing the defoamer. The defoamer may have a dispersed oil phase with a droplet size of 4 to 8 μm, and a viscosity of 100 to 1000 cP, and is widely used for defoaming in paper coating and wet-end in a paper mill. A method for preparing an oil-in-water emulsion defoamer is also provided. The method may include adding an emulsifying agent to biodiesel, and mixing, then gradually adding hydrophobic fumed silica, to obtain a first mixture. The method may also include gradually adding water and a non-ionic surfactant, and stirring until uniform to obtain a second mixture. The method may also include gradually adding the first mixture to the second mixture, and stirring until uniform, to obtain an oil-in-water emulsion defoamer.

Claims24

Dependent claims

A method for preparing an oil-in-water emulsion defoamer, comprising the steps of:

(i) adding 0.2 to 6 weight parts of an emulsifying agent to 30 to 60 weight parts of biodiesel, and mixing, then gradually adding 0.5 to 3 weight parts of hydrophobic fumed silica, and thoroughly stirring to disperse said silica, to obtain a mixture A;
(ii) gradually adding 10 to 50 weight parts of water to 5 to 30 weight parts of a non-ionic surfactant, and stirring until uniform at a stirring rate adjusted according to the variation of the viscosity of the resulting mixture, to obtain a mixture B, wherein said non-ionic surfactant has a cloud point of below 50° C.;
and then
(iii) gradually adding the mixture A to the mixture B, and stirring until uniform, to obtain said oil-in-water emulsion defoamer.

1 more element

Dependencies are inferred from the claim text.

Biodiesel-based emulsion defoamer and method for making the same

Life of this patent

Biodiesel-based emulsion defoamer and method for making the same

Life of this patent

Abstract

Claims24