The antifoaming agent of silicone oil is insoluble in water and mineral oil, so its antifoaming ability is strong as well as its antifoaming effect is greatly enhanced. Because Si-O bond and Si-C bond are relatively stable, they are allowed to be used in systems containing a small amount of acid, alkali and salt. Most of the commonly used organosilicon Defoamers in industrial production are a kind of secondary processing products of silicone oil made by adding dispersants to silicone oil, which are all liquid mixtures.
The composition and functional principle of organsilicone defoamer
The antifoaming active ingredient of organsilicone defoamer is silicon paste. Hydrophobic silica particles in silicone paste can form a defoaming agent dispersion with silicone oil, help silicone oil droplets insert into the surface of foam film, reduce insertion resistance of silicone oil drops and foam drainage time, increase the depth of foam dispersant inserted on the surface of foam film, improve the ability of destroying oil-water-air film, and accelerate the defoaming speed.
Under the heating conditions, the SI-OH bond in methyl MQ silicone resin can react with the residual Si-Oh in dimethylsilicone oil and hydrophobic fumed silica to form an organic polymer with complex polymer chain structure. This polymer can effectively improve the dispersibility of silica, and further enhance the synergistic defoaming and antifoaming performance of silica and dimethylsilicone oil.
Emulsion type organosilicon defoamer uses two methyl silicone oil as the main raw material, which is a defoamer emulsified by adding methyl MQ silicon resin and hydrophobic carbon black. It can be widely used in food, paper, leather, environmental management and other aspects of chemical production.
Organsilicone defoamer is suitable for defoaming of industrial circulating water, water treatment, circuit board cleaning, metal cutting fluid, metal cleaning, oil processing grinding fluid and alkaline cleaning fluid. It is suitable for defoaming of textile, printing and dyeing, emulsion polymerization, civil washing, various kinds of colorants and coatings.
Features of organsilicone defoamer
Strong dofoaming ability, usually only adding systematic mass fraction (1×10-6～100×10-6) can get good defoaming effect.
In terms of chemical properties, it’s inert to common substances and will not react chemically with foaming substances.
Organsilicone defoamer has good heat resistance, high and low temperatur resistance. The viscosity of silicone oil increases gradually only when the temperature reaches above 200℃, but its silicon-oxygen bond does not decompose.
Good flexicity and lubricity of organsilicone oil is advantageous to improve the quality of coated paper.
Organsilicone defoamer is non-toxic, pollution-free, physiological inert and environmentally friendly.
Organsilicone defoamer has outstanding weatherability, durability and aging resistance, and can play its role in any environmental conditions.
Our methyl MQ silicone resin XJY-8205 product can replace DC-1601 product.