Defoaming agents can be divided into the following three categories:

    1) Products based on natural products: animal and plant oils, mineral oils and compounds, etc.;

    2) polyether type: block copolymer of polyoxyethylene polyoxypropylene, modified polyether, etc.;

    3) polysiloxane as the main raw material of silicone defoaming agent: pure silicone oil, silicone oil solution, silicone paste, silicone oil emulsion, powder, block six categories.

    According to the dosage form of defoaming agent can be divided into: solution, emulsion, powder, paste, block.Defoaming agent is divided into: food, pharmaceutical, fermentation;Paper making, printing and dyeing auxiliaries;Petroleum exploitation, storage and transportation, refining, lubricating oil;Chemical production;Metal cutting fluids, chemical cleaning, water treatment and so on.

    According to the different focus of the use of performance, defoaming agent can be divided into: defoaming agent, foam suppressant and defoaming agent.

    Silicon and non-silicon defoaming agents have been used in different processes of textile printing and dyeing industry, and their practical performance has advantages and disadvantages.Silicon-based defoaming agent has the advantages of strong defoaming performance, durable foam suppression, low dosage, stable chemical properties, high temperature resistance, non-volatile and non-toxic, and is an important development direction of textile dyeing and finishing auxiliaries.In textile dyeing and finishing process, water emulsion containing polysiloxane 1% ~ 2O% is usually used.