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Lubricant Additive Many Substances Are Polar Oct 25, 2017

Lubricant Additive not only reduce friction, improve the efficiency of engine and other machine's energy conversion, but also can reduce wear and prolong the service life of wearing parts. Usually, in order to further enhance the lubrication effect, some submicron particles with sub-micron size will be added to the lubricant as an additive, they can enter the contact area of the sliding surface, thus effectively obstructing direct mechanical contact. These ultrafine particles have significant size advantages and have excellent chemical and thermal stability in the friction environment. However, whether the lubricant can be dispersed effectively is the most important factor to limit its lubricating effect.

For lubricating oil users, the viscosity of lubricating oil is a familiar concept, because viscosity is the primary indicator of the purchase of lubricating oil. Viscosity is also an important indicator to be paid attention to in the lubricating oil that has been put into use. The composition of lubricating oil is base oil and some additives, viscosity is mainly related to base oil. In addition to base oil, additives also play an important role in lubricating oil. Good lubrication on the role of lubricant additives to do a simple introduction.

Lubricant additives are organic or inorganic compounds, some liquid, soluble in Lubricant Additive, some solid, suspended in lubricating oil. Additive in lubricating oil content is not much, according to the type of oil, content in 0.1%~30% (volume ratio), some Lubricant Additive contain more additives, such as oil, some Lubricant Additive contain less additives, such as steam turbine oil.

The function of lubricant additive is divided into three aspects:

It further enhances the performance of the base oil itself, such as antioxidants, rust inhibitors, defoamer, and emulsifiers.

To make up for the deficiencies of the basic oil performance, such as depressant, viscosity index modifier.

The new performance of the base oil, that is, the basic oil itself does not have the performance, these properties are mainly achieved through the additive, such as extreme pressure agent (EP), dispersants, metal passivation agent.

Polar additive:

Additive has polarity, refers to the additive itself has a kind of attraction, when the lubricating oil enters other polarity material or the impurity, this attraction can enable the additive molecule to adsorb to these foreign substances. Many substances are polar, such as sponges, metals, dust impurities, wood pulp, wood and other hydrophilic substances or water-soluble substances. Non-polar material has paraffin, Teflon (teflon), pure mineral oil, water resistant substances, duck back hair (hydrophobic) and so on.

The additive of lubricating oil consumes when it is used, and when they are depleted, the additive loses its effect. Therefore, in the use of Lubricant Additive, you must pay attention to the use of conditions. For example, the use of impurities, dust, water and other polar substances, additives will be adsorbed on impurities, resulting in a large number of losses, the corresponding, the performance of Lubricant Additive weaken or even lose some of the performance.

Effect of additive polarity:

Additive polarity mechanism has many aspects, but for lubricating oil, we mainly focus on these aspects: the inclusion of impurity particles, water emulsification, infiltration of metal surface.

The additive of lubricating oil will adsorb to the surface of impurity particles, and enclose the impurity around the package, this kind of additive mainly has metal passivation agent, detergent, dispersing agent. In the case of dispersant, it can adsorb solid particles such as carbon and impurities, disperse them in oil, and prevent the accumulation of impurity particles from forming large particulate sediments. Detergent dispersant is an important additive in automobile engine oil.

Although additives on the performance of lubricating oil, but do not represent the greater. There are two possible consequences of excessive use of additives in lubricating oil: one is to affect the performance of lubricating oil, for example, if the concentration of detergent is higher than the normal level, the detergent dispersants will be surrounded by anti-wear agents or extreme pressure agents, so that they suspend in the oil, causing the extreme pressure and anti-wear agents when needed, Where necessary, there is no effective protective layer, and the result is increased wear. If the antiwear agent is used too much, it will lead to a reduction in the performance of the metal rust inhibitor, as previously said, the additive will be adsorbed on the polar material surface, including the metal. If the anti-wear agent is excessive, will be adsorbed on the metal surface, the rust inhibitor may not have the place adsorption, causes the antirust corrosion prevention effect to reduce. Therefore, the additive is not the more the more, to maintain a variety of additive formula balance is a necessary condition for high-quality Lubricant Additive.