The defoaming effect of silicone defoamer is very good, and it is favored by our customers. Here we introduce the five types of silicone defoamer for you:

1, water-emulsion type defoamer: with polydimethylsiloxane (silicone) as the main body, and white carbon black complex, under the action of surfactant (emulsifier) to prepare O/W type of various concentrations of water-emulsion defoamer (suitable for water-based media defoamer) or made of high concentration silicon paste, when using the smear method or temporary dilution after use.

2, oil system defoamer: oil system defoamer: with the help of solvent to carry silicone oil and disperse into the shooting fluid. Solvent diffusion, silicone oil or droplets play a defoaming role (generally high, low viscosity silicone oil blend) or make silicone oil/mineral oil dispersion. Crude oil demulsification dehydration: crude oil occupies a certain proportion in the form of W/O emulsion, without removing most of the water, this oil can not be processed, the petroleum industry needs a large number of silicone surfactants for demulsification. This is a white solid with a surface tension of 20.6mN/m in 1% aqueous solution

3, solid powder defoamer: solid powder defoamer: containing 2%~5% of the mass fraction of silicone defoamer and 98%~50% of the mass fraction of powder solid carrier.

4, Antifoam rod: Antifoam rod: silicone oil, sodium sulfonate and wax preparation.

5, self-emulsifying self-dispersing defoamer: self-emulsifying self-dispersing defoamer: The introduction of hydrophilic group on the polysiloxane molecular chain can significantly improve the dispersion of silicone in water, or form a self-emulsification, and become a special defoamer, defoaming above the cloud point, suitable for high temperature and high pressure jet dyeing and other defoaming. "Self-emulsifying type" defoamer heat resistance, mechanical stability, acid and alkali resistance, defoamer under harsh conditions, such as polyester fiber high temperature dyeing, diethanolamine aqueous desulfurization system, various oil cutting fluid, non-freezing fluid and other systems defoamer.



Silicone defoamer application:


1. Textile printing and dyeing:


(1) Sizing process: water-emulsion silicone defoamer, such as silicone polyether, adding 0.2-0.25g /L in the sizing tank


(2) Chemical fiber oil agent: chemical fiber oil agent added 0.02¬0.04% water emulsion type defoamer. Organic silicone oil should be included in the formula of chemical fiber oil.


(3), desizing refining: the selection of polyether silicone.


(4) Bleaching: strong acid, silicone defoamer.


(5), dyeing: silicone emulsion defoamer. Jet dyeing is best to choose polyether silicone, high temperature defoaming, low temperature water soluble, non-staining fabric.






2. Petrochemical industry:


(1) Drilling: ethyl silicone oil (or methyl silicone oil layer emulsion) is used as a mud additive.


(2) Oil production: oil and gas separation, defoaming rod. The melting point is 2.8¬13.9℃ higher than the wellhead foam temperature.


(3) Natural gasoline absorption: Use gasoline to mix dimethyl silicone oil into 2% solution.


(4) Oil and gas separation and demulsification:


A, oil and gas separation, adding 0.025 ~ 0.0065mg/Kg of crude oil can improve production capacity;


B, demulsification: oil and gas separation of crude oil is generally micro W/O emulsion, adding about 0.2mg/Kg of appropriate defoamer, can achieve the effect of demulsification and defoamer.


(5) Refining: vacuum distillation adds defoamer, the color of the fraction is improved, the range of the fraction is relaxed, and the diesel solution with silicone oil is commonly used.


(6) High energy fuel (internal combustion, jet fuel, aviation fuel) with cyanide alkyl polysiloxane dispersed in high flash point kerosene, and then added to the high energy fuel as a high efficiency defoaming agent.


(7) Asphalt and residual oil: the amount of silicone oil added is 0.2×10-6 ~ 2.0×10-6


(8) Delayed coking, coke removal, scale elimination: reference amount of defoamer addition: 0.05 ~ 100×10-6


(9) Defoamating drilling fluid: high viscosity sulfonate metal salt (petroleum calcium sulfonate: sulfonated asphalt sodium = 1:1), the amount of siloxane added about 100 ~ 400×10-6 or 5 ~ 15mg/Kg, sulfonate: siloxane close to 1:1 is better.


(10) Lubricating oil: such as internal combustion engines, automotive lubricants, metal working fluids, compressor oil, etc., when silicone oil is added for defoaming, it is because of the following advantages:


A, insoluble in lubricating oil, in a dispersed state, is conducive to adsorption on the bubble film bubble breaking;


B, there are similar to mineral oil alkyl, can squeeze into the bubble film, weaken the molecular gravity;


C, low surface tension, good penetration, adsorption on the surface of the bubble film to reduce the local surface tension, due to the surface tension of the bubble film is not uniform and burst.


Heavy oil is selected with small viscosity silicone oil, and the addition amount is 1 ~ 10×10-6. In addition, alkyl polyacrylates are also better and have better gas release.


Branched chain amine added to crude gasoline, naphtha, and then added to the lubricating oil, can also be used as a defoamer, adding a small amount of 0.05 ~ 1%, this defoamer can be added to the metal cutting fluid.






3. Paper industry


(1) Pulping: silicone emulsion defoamer (90g/T paper).


(2) Coating paper: coating paint, printing paper after calender, etc., coated bubbles are generally coated with non-silicon defoamer.


(3) Sewage treatment: water-emulsion silicone defoamer, such as BD-303 silicone defoamer.






4, paint, ink application


I. Requirements for defoamer in coating production:


(1) It has a certain affinity with the active substance on the surface of the foam, but it should be insoluble and insoluble in the bubble liquid;


(2) The surface tension is lower than the surface tension of the bubble solution, and has a lower HLB value;


(3) The emulsion (latex) should be stable;


(4) The coating film can not cause the adverse consequences of fisheye and shrinkage;


(5) Water-based coatings with defoamer: the use of insoluble substances in water, such as mineral oil, advanced alcohol, silicone resin, silicone is the best water-based coatings defoamer.


Non-water-based coating defoamer: commonly used insoluble in organic solvents, such as low-grade alcohols, silicone resins (silicone resin dosage should be appropriate, excessive easy to shrink, crack, hole, now more modified silicone resin or emulsified silicone resin).


II. Silicone defoamer recommended for water-based coatings:


(1) Silicone oil, hydrophobic SiO2 mixture for:


Epoxy resin, poured, dosage 0.3%;


Thermoplastic acrylic resin, sprayed, dosage 0.3%


(2) Polyether polysiloxane and hydrophobic SiO2 mixture is applicable:


Thermosetting alkyd resin, dipping amount 0.3%, scraping amount 0.1%


(3) The mixture of hydrophobic SiO2, hydrocarbons and silicone oil is suitable for:


Thermoplastic acrylic resin, printing, ink, content 0.1%;


Air-dried acrylic resin, poured, dosage 0.5%.


(4) Silicone oil and hydrophobic SiO2 mixture emulsion applicable:


Alkyd modified styrene acrylic resin, poured, dosage 0.5%






5. Silicone defoamer for detergent industry


Polysiloxane and modified sodium tripolyphosphate are used as powder detergent additives, and dimethylsilicone oil (1500c.s) emulsion containing SiO2 of 2 ~ 6% is mixed with anhydrous sodium tripolyphosphate, and the emulsion dosage is 10 ~ 40% to form hydrate as an additive.


Metal cleaning solution, required to be alkali resistant, preferably transparent and antifoaming when added to the liquid product.






6. Silicone defoamer for food industry:


Food special polysiloxane resin: dimethylpolysiloxane as the main body, containing less than 15% SiO2 food is an aqueous solution, with its emulsified products, other can be directly oil-type products, the amount of control