There are many types of water-based defoamers, and silicone defoamers are the mainstream of the market and the key direction of future development. Here we are talking about silicones water-based defoamers, how to optimize the design of the formulation of this defoamer? First of all, we have to find out what ingredients are in the formula. What does these ingredients do?
Composition of silicone-based water-based defoamers
There are 6 main ingredients in the formulation of water-based defoamers:
1. The active ingredient is polysiloxane, and in some formulations, the content of this ingredient is not the most.
2. Emulsifier, the main function of this ingredient is to make polysiloxane can be dissolved in the foaming substance, so that polysiloxane can be quickly spread on the surface of the foam, so as to achieve the effect of rapid defoaming.
3. Dispersing agent, mainly hydrophobic silica, can improve the efficacy of defoamer.
4. The carrier is a high content in the formula, and the co-solvent such as water or hydrocarbons is generally used.
5. Stabilizer is an additive that improves the stability of the defoamer, which can be a thickener or a preservative.
6 other additives
Optimization of silicone water-based defoamer formulation
When optimizing the formulation of water-based defoamers, start with the efficacy of the ingredients on the defoamer. How to choose components is the essence of formula optimization. The formulation optimization experience of water-based defoamers is as follows:
1. Active polysiloxane, dimethyl silicone oil with different polymerization degrees is selected for mixing.
2. The dispersant hydrophobic silica is selected after high temperature hydrophobic treatment to ensure that the silica is evenly dispersed.
3. Emulsifier, mixed with two emulsifiers with HLB value = 4 and HLB value > 10, the HLB value of mixed emulsifier is better controlled at about 8.
4. Control the stability of the defoamer, the size of the defoamer particles is critical, and the particle size is controlled at about 10 microns.