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Brief Introduction of Lubricating Oil Defoamer

Sep 2, 2021

Product characteristics Lubricating oil defoamer
Lubricating oil defoamer is a special defoamer developed by introducing foreign technology and equipment according to the characteristics of machining fluids. It is mainly suitable for the defoaming of high temperature, strong alkali and high viscosity systems. The special defoamer for lubricating oil also overcomes the shortcomings of the incompatibility of general defoamers and emulsified oil, can be mixed with various lubricating fluids, and does not float on the surface. In addition, the anti-shear ability is particularly strong during the grinding process. When the saponified oil is exposed to water, there will be no floating oil phenomenon, and no grease stain will be formed on the surface of the machine tool. It has a long foam suppression time and is well received by oil manufacturers.

1. It has strong defoaming and anti-foaming power, with a small amount, and does not affect the basic properties of the foaming system.
2. It has good diffusibility and permeability, and can be completely compatible with oil and cutting fluid.
3. Good heat resistance, chemical stability, non-corrosive, non-toxic, no adverse side effects, non-flammable, non-explosive.
4. It can be used in acid, alkali, salt, electrolyte and hard water.
5. Its performance is comparable to imported products, and the price is more obvious.
Application occasions
Lubricant defoamers are used in metal processing lubricants, various cutting oils, hydraulic fluids, anti-rust lubricants, heat treatment media, fluxes, forming oils, drawing oils, die-casting oils, stamping oils, electric spark oils, water- Glycol hydraulic fluid, coolant, grinding (oil) fluid, wire cutting fluid, dehydrating agent, various oils such as saponified oil and other defoaming. The amount of lubricant defoamer added is 0.1 to 0.8℅ of the total volume, but the most economical amount should be determined after the process test; it can also be mixed with other powder additives evenly before use.
Types of defoamers
According to different classification standards, defoamers can have many methods, such as solid particle type, emulsion type, dispersion type, oil type and paste type according to the form; according to the application of defoamer in different industrial production Can be divided into textile industry defoamers, paper industry defoamers, paint industry defoamers, food industry defoamers and petroleum industry defoamers, etc.; according to the chemical structure and composition of defoamers can be divided into mineral oil, Alcohols, fatty acids and fatty acid esters, amides, phosphate esters, silicones, polyethers, polyether modified polysiloxane defoamers. [4]
The following four types of non-silicon type, polyether type, silicone type and polyether modified silicone type are introduced.

Non-silicon type
Non-silicon defoamers mainly include alcohols, fatty acids, fatty acid esters, phosphate esters, mineral oils, amides and other organic substances[4]. Among the amides, monoamides, bisamides, etc. are commonly used, and there are also trialkyls. Melamine, cyanuric chloride, melamine, fatty amine and other nitrogen-containing compounds; phosphate esters include monoalkyl, dialkyl phosphate, fluorinated alkyl phosphate, etc., which are commonly used for defoaming paint detergent products; carboxylates include Three types of substances: fatty acids, such as lauric acid, palmitic acid, etc.; fatty acid esters, such as fatty acid glycerides, animal and vegetable oils, etc.; fatty acid soaps, such as calcium, aluminum, and magnesium soaps of stearic acid and palmitic acid; fatty alcohols and ethers, including Straight and branched chain alcohols, ethers. [6]
This type of defoaming agent is cheap. It is suitable for use under the conditions of low liquid shearing force and mild foaming ability of the surfactant contained. Its preparation raw materials are easy to obtain, high environmental protection performance, and low production cost, but The defoaming efficiency of dense foam is low, and because of its strong specificity, the market share has been shrinking. However, in some special industries, such as strong acids and alkalis, non-silicon defoamers that are resistant to acids and alkalis such as PTFE are needed

Polyether type
Polyether defoamer is a copolymer of ethylene oxide and propylene oxide. It mainly uses its solubility and its different characteristics at different temperatures to achieve defoaming effect. At low temperatures, the polyether is dispersed in water. When the temperature rises, the hydrophilicity of the polyether gradually decreases. When the cloud point is reached, the polyether becomes insoluble, so that it can play a defoaming effect. In the preparation process, the cloud point can be changed by adjusting the type of polyether and the ratio of raw materials, which can be used in different industries. 

Polyether defoamer has excellent properties such as strong foam suppression and high temperature resistance. The disadvantage is that it has a certain degree of toxicity, the use conditions are limited by temperature, the foam breaking rate is not high, and the field of use is narrow. If the amount of foam produced is large, it cannot quickly eliminate the foam, and defoamer must be added to it again to show the defoaming effect.

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