1. What is mineral oil defoamer
Antifoam is a chemical additive used to eliminate foam produced in industrial production. There are many types of it. Mineral oil defoamer is one of them.
Mineral oil defoamer is made with an oil carrier (the oil can be mineral oil, vegetable oil, white oil or any other oil that is insoluble in the foaming medium except silicone oil), adding hydrophobic particles and emulsifiers, etc. It is widely used in inks, adhesives, coatings, etc.
2. What are the main components of mineral oil defoamer?
Mertone oil defoamer has strong applicability, low price and good heat resistance. It has good anti-foaming ability and acid and alkali resistance, and is used in many fields. The reason why mineral oil defoaming agent has good defoaming ability is inseparable from its main ingredients. The ingredients of mineral oil defoaming agent are:
1. Mineral oil
It exists in the form of carrier in defoamer, including kerosene, diesel, engine oil, white oil, liquid wax, alkylbenzene, Naphthenic oil. These mineral oils exist in liquid form at room temperature, and the dosage is 60~85% of the total mass of the defoamer.
2. Inorganic hydrophobic particles
Hydrophobic solid particles on the bubble surface will attract surfactants The hydrophobic end makes the hydrophobic particles hydrophilic and compatible with the water phase, thereby achieving the defoaming effect. The dosage is 3~12%.
3. Defoaming additives
Defoaming additives mainly include stearic acid, polyamide wax, modified polyamide wax, and polyethylene wax And modified polyethylene wax, silicone oil or modified silicone oil, polyether, etc. These substances are used alone or mixed, and the dosage is 0.1 to 5% of the total mass of the defoamer.
4. Emulsifiers
Including anionic, cationic, nonionic, preferably nonionic surfactants. Its function is to disperse the active substances into small particles so that they can be dispersed in water, so that the defoamer has good dispersibility and achieves better defoaming effect. The dosage is 5~16%.
3. Preparation method of mineral oil defoamer
Mineral oil defoamer is an important type of defoamer. Its preparation process is :
1. Pour mineral oil into the reaction container and add stearic acid while stirring.Ester (modified stearate is also acceptable), as well as silica and emulsifier, stir until evenly dispersed.
2. Heat, raise the temperature to a transparent state, and then lower the temperature to below 45°C.
3. Grind, transfer to sand mill, grind 4-5 times, about 1-2 hours.
4. Test its defoaming performance and use it after passing the test.
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