Basic Information On Friction Modifiers

The primary objective of a lubricant is to minimize friction between two or more surfaces of mechanical components. The term lubricity describes the ability of the lubricant to reduce friction. There are many instances where the base oil in the industrial grease or oil may not have the most suitable lubricity and simply adding more lubricant will not fix the issue. The friction modifiers are added to lubricants to alter the lubricity of the base oil, thereby meeting the demand of the application.

bearing-grease-high-speedFriction modifiers are compounds that change the coefficient of friction of lubrication products. In other words, these substances change the amount of power required to allow two or more surfaces to move past one another. There are friction modifying compounds. Some friction modifiers increase lubricity to improve efficiency. Others reduced lubricity to give mechanical components improved traction.

Decreasing the friction within a combustion engine enable parts to move more efficiently. This improves fuel economy. In transmissions, the role of the friction modifier is to increase friction as to protect against slippage when shifting gears.

There are lots of lubrication applications in which a specific quantity of traction is required for devices to run effectively. The friction modifiers employed in these applications are not intended to enhance or reduce friction but to cause the lubricant to act differently depending on the shear conditions.

Worsening of Static Oil Bleed

Oil bleed is something that all industrial grease suffer from. The bleeding or separation of oil from the thickener is a normal occurrence that can happen during service or storage. The bleeding that happens during service is what is known as dynamic oil bleed and happens due to mechanical stresses that the grease is exposed to. This type of bleeding is necessary for the grease to perform its lubrication duty. The movement of the bearings causes the oil to flow out of the thickener and into the surfaces that requires lubrication.

Furnace bleeder

The bleeding that happens during storage is known as static bleeding. During storage, the weight of the grease creates a stress that causes the thickener to release oil. The less dense oil travels to the top of the grease and forms a puddle on the surface.

The separated oil can be removed or mixed back into the grease. The amount of oil that separates during storage is inconsequential to the performance of the grease. However, certain storage conditions can aggravate the bleeding to a level in which the performance of the grease is jeopardize.

Factors that can worsen static oil bleed are vibrations and temperature. The mechanical and thermal stress caused by these two activates the grease into releasing oil. Proper storage practices must be observed to prevent excessive oil bleed and protect the performance of the grease.