Home > news > Content
What are the common additives for industrial special oils?
- 2018-09-29-

Shanghai Zhuoli Lubricant Industry Special Oil Additives are mainly composed of antioxidants, anti-wear agents and friction modifiers ( also known as oily agents ) . The additives sold in the market are generally composites of the above single additives. It is the difference in the composition of the single additive and the ratio of several single additives in the composite additive.

Industrial special oil ——The significance of clean and dispersing additives

The first one refers to industrial oils that can be oxidized to form insoluble materials such as gels, cokes, etc. or suspended in oil to form a stable colloidal state and not easily deposited on the components; the second means that they will have been deposited on the engine. The gel, coke, etc. on the part are washed by the lubricating oil.

A cleansing dispersant is a surface active substance that adsorbs solid particulate contaminants in oil and suspends contaminants on the surface of the oil to ensure that the oil that participates in the lubrication cycle is clean to reduce high temperatures and paint film. Formation.

The dispersant can disperse the low temperature sludge in the oil so that Filter out the oil in the circulation. Clean dispersing additives are a general term for them, and they also have washing and anti-oxidation. And anti-corrosion and other functions. Therefore, it is also called a multi-effect additive.

In a certain sense, the quality of industrial special oil, The main difference is in resisting the formation of high and low temperature deposits and paint film. It can also be said that the performance and the amount of detergent in the lubricating oil are shown. It can be seen that the detergent dispersant has an important influence on the quality of the lubricant.

Industrial special oil - Reasons for adding antioxidants and antioxidants

Engines fueled with fuel oil, kerosene, gasoline, natural gas or artificial gases, liquefied gases, etc. must use lubricants ( such as paraffin-based lubricants ) to lubricate their moving parts. Lubricating oil should be in contact with air during use, and various mechanical equipment will generate heat, which will increase the temperature of the friction part during operation.

In addition, various metal materials in the equipment, such as copper and iron, will catalyze to accelerate the oxidative deterioration of the oil, increase the viscosity of the lubricating oil, generate acidic substances to corrode the metal material, and also produce various carbon or asphalt. A sediment such as a paint film blocks the pipe.

All of these changes adversely affect the continued use of the oil and the proper functioning of the equipment. Therefore, the oil is required to have better anti-oxidation and anti-corrosion effects.

Adding anti-oxidation and anti-corrosion additives to the oil, the purpose is to inhibit the oxidation process of the oil, passivate the catalytic effect of the metal on oxidation, and extend the use of the oil and protect the machine.

After a certain exquisite base oil, it has a certain anti-oxidation effect, but it can not meet the demanding requirements of modern times and its follow-up. It is necessary to add anti-oxidation and anti-corrosion additives. The addition amount is second only to the detergent dispersant and viscosity index improver.

Industrial special oil ——Pour point depressant mechanism

A pour point depressant is a chemically synthesized polymer or condensate which generally contains a polar group ( or aromatic nucleus ) in its molecule and an alkyl chain similar in structure to the paraffinic hydrocarbon.

The pour point depressant can't prevent the paraffin from crystallizing at low temperature, that is, the cloud point of the oil is unchanged. It changes the shape and size of the wax crystal by adsorption on the wax crystal surface or co-crystal with wax to prevent the wax from forming a three-dimensional network. The structure is such that it still maintains the ability of the oil to flow at low temperatures.

It should be emphasized that the pour point depressant can only depressurize in oils containing a small amount of wax. The oil contains no wax or too much wax and has no pour point depressing effect. A commonly used pour point depressant is methyl dimethacrylate.

Industrial special oil - rust and preservative mechanism

The rust inhibitor is a highly polar compound whose polar group has a strong adsorption force on the metal surface and forms a tight single or multi-molecular protective layer on the metal surface to prevent the corrosive medium from coming into contact with the metal. To the rust prevention effect.

In addition, the base oil in which the rust preventive agent is dissolved can be adsorbed in a place where the rust preventive agent is less adsorbed, and penetrates into the rust preventive additive molecule, and the van der Waals force and the additive molecule act together to make the adsorption film more firm.

Due to the action of the base oil, the adsorption of the additive on the metal surface is stronger and harder to separate, and the oil can also form a concentrate with the additive, thereby making the adsorption film more compact.

In short, these effects of the base oil are beneficial to protect the adsorbed molecules, maintain the thickness of the oil film, and play a certain role in rust prevention. Commonly used anticorrosive agents such as: sulfonium sulfonate, calcium sulfonate, modified calcium sulfonate, boric acid amine, carboxylic acid amine.

Industrial special oil - oily agent

Mainly refers to the lubricant's ability to reduce friction. The additives used for the purpose of improving this performance are called Oilness agents , sometimes referred to as Friction reducers or friction modifiers, and are used as oily agents for certain surface active substances. Vegetable oils, fatty acids, esters, amines, etc.