Why non-soap based thickeners are used for the preparation of grease?
They have outstanding heat resistance, since the thickener will not melt, and when tested for dropping point, do not give a value. They have good oxidative stability and are usable at least up to the temperature that the constituent oil evaporates. These greases also have excellent water resistance.
What is non-soap grease?
Polyurea greases are the most popular non-soap grease today. Organophilic Clay: Also referred to as organo clay or clay thickeners, these thickeners are mineral based usually made from bentonite, hectorite, or montmorillonite. The minerals are purified into a clay and treated to be compatible with organic chemicals.
Which of the following can be used as a thickener for the preparation of grease?
Fluoropolymer powders such as PTFE (polytetrafluoroethylene) can be used to thicken lubricating fluids to form grease.
What is the purpose of the soap in grease?
Soap is the primary thickener for 90 percent of all greases. Simple soaps have a metallic base with a single fatty acid; complex soaps have a metallic base and multiple fatty acids as complexing agents. These soaps self-assemble into micelles that allow a compound that is normally insoluble, such as soap, to dissolve.
What is thickener in grease?
Thickener. The thickener is a material that, in combination with the selected lubricant, will produce the solid to semifluid structure. The primary type of thickener used in current grease is metallic soap. These soaps include lithium, aluminum, clay, polyurea, sodium and calcium.
How do you make calcium soap grease?
You make a reaction between tallow and calcium hydroxide. This will produce a calcium soap. After the completion of the reaction you put 80% of mineral oil. Alternatively, I bough stearic acid, I made it react with calcium hydroxide, which produced the soap Calcium Stearate.
How many types of grease are there?
All these seven types of grease can be referred to as multipurpose (MP) greases, extreme pressure (EP) greases, marine greases, heavy-duty greases, specialty greases, automotive greases, industry greases, and so on, depending on the unique properties of base oils, additives, and thickeners used in the process of …
How do you liquify grease?
What will dissolve grease? White vinegar can remove grease. Wet a rag or sponge with vinegar and saturate the greasy area. Then, wipe it up.
What is the difference between regular grease and lithium grease?
The main difference that exists between standard lubricating grease and lithium grease is that standard grease is often used in industrial settings and lithium grease is primarily used in domestic settings.
What causes grease to liquify?
Dropping point is an indicator of the heat resistance of grease. As grease temperature increases, penetration increases until the grease liquefies and the desired consistency is lost. The dropping point is the temperature at which a grease becomes fluid enough to drip.
What are the different grades of grease?
Greases are classified into nine consistency grades (000, 00, 0, 1, 2, 3, 4, 5, 6) established by the National Lubrication and Grease Institute (NLGI).
Which type of grease is widely used and why?
Lithium-based greases are the most commonly used; sodium and lithium-based greases have higher melting point (dropping point) than calcium-based greases but are not resistant to the action of water. Lithium-based grease has a dropping point at 190 to 220 °C (350 to 400 °F).