Defoaming principle of polyether defoaming agent
When polyether comes into contact with water, it rises from a low temperature state of dissolving in water to a temperature where turbidity appears, which is its cloud point. The foaming system will also exceed the cloud point as the water temperature exceeds the cloud point. Only then will the polyether defoaming agent play its role, which can quickly defoam and control the generation of foam.
Polysiloxane defoamer has the advantages of rapid defoaming, long foam suppression time, safety, and non-toxicity. However, it is insoluble in water and has poor resistance to high temperatures and alkali. Polyether defoamer has high temperature resistance and strong alkali resistance. However, its defoaming speed and defoaming time are not ideal. Through condensation technology, the polyether is linked to the polysiloxane chain, so that it has the advantages of both defoaming agents and becomes a new defoaming agent with excellent performance and broad application prospects.
Application scope of polyether modified silicon defoamer
It is widely used for defoaming in high-temperature dyeing process and fermentation process of polyester fabrics. In addition, it can also be used for defoaming of diethanolamine desulfurization systems and various oil agents, cutting fluids, antifreezes, water-based inks and other systems. It is also suitable for washing away uncured resin after photosensitive resin plate making in the printing industry. Foam is a representative defoaming product with excellent performance and wide range of uses.
The difference between polyether modified silicon and polyether defoamer and silicone defoamer is that polyether modified silicon combines the advantages of polyether defoamer and silicone defoamer and is non-toxic and harmless. It is harmless to bacteria and the added amount is very small. It is a cost-effective product. Polyether-modified silicone is a polyether-siloxane copolymer (referred to as silicon ether polymer) prepared from polyether segments in siloxane molecules.
