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Defoamers are indispensable additives in industrial production. They are mainly divided into two categories: water-based defoamers and oil-based defoamers according to system compatibility. This article will systematically analyze the differences in ingredients, action mechanisms, and typical application scenarios between the two, and provide selection guidance.

•  Application scenarios of water-based defoamers

1. Sewage treatment system

Activated sludge process: Control biological foam in aeration tank (polyether modified type is best)

MBR membrane treatment: Select low-viscosity defoamers that do not affect membrane flux

Case: After a municipal sewage plant uses polyether defoamers, the foam thickness is reduced by 80%

2. Water-based paint/ink

Construction defoaming: Eliminate bubbles generated by latex paint roller coating

Formula recommendation: Addition amount 0.1-0.5%

Note: Compatibility testing is required to avoid shrinkage

3. Food processing

Fermentation industry: Food-grade polyether defoamers for beer/soy sauce fermentation tanks

Sugar solution concentration: Inhibit foam during evaporation

4. Other typical applications

Papermaking white water circulation system

Industrial cleaning agents (especially alkaline cleaning fluids)

Water-based adhesive production

• Application scenarios of oil-based defoamers

1. Petrochemicals

Crude oil degassing: Solve the foam problem of the vacuum tower (silicone oil-based products)

Lubricant production: Control the foam during the blending process

Data: Degassing efficiency increased by 35% after use in a refinery

2. Oil-based coatings/resins

Epoxy system: Eliminate bubbles during casting (high temperature resistant type required)

UV curing ink: Choose varieties that do not affect the curing rate

3. Metalworking fluids

Cutting oil: Suppress the foam generated by high-pressure injection

Rolling oil: Maintain a stable lubricating film (low addition of 0.05-0.2%)

4. Special industrial scenarios

Asphalt modification production process

Solvent-based adhesives

Ink printing machine circulation system