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Sep 26, 2016
For aqueous systems, the largest of twotypes of anti-foaming agent is a hydrocarbon oil (mineral oil) class andsilicones. Traditionally,aromatic and aliphatic petroleum derivatives are used as anti-foaming agent inthe composition of the active substance distribution. Early on, the aromatic oil is widely use. But its dangers to healthand the environment hinder their application. Toxicity of aliphatic oil is small, but in an aqueous medium lowcompatibility of the high gloss coating can cause serious loss of light issues.
Polyether-modified hydrophobic orhydrophilic part of a series of silicone can be very efficient defoamer. Modified so that the role ofanti-foaming agent has a very strong development of the bout, it does notaffect the gloss paint, with high system compatibility.
Widely used in modern water-basedcoating systems and ink systems. Polyether-modified silicone to bond SI-O-C bond and SI-C-bondedform a polyether segment and a silicone segment together. Siloxane segments to provide asurfactant, and by the nature of the degree of compatibility of the polyethersegments is determined. Defoamingsystem is the chemical nature of the chemical properties of the selecteddefoamers restrictions. Thewater-based system is more complex formula, the relationship between the scopeof its role in the structure of anti-foaming agent is difficult to set forthclearly. Since therequirements are different, and therefore can’t be expected to have a way to solve these problems defoaming. Because some polyether-modifiedsilicone materials having a high surface force development, it does not add thehydrophobic solid particles, also has excellent anti-foaming ability.