Bearing lubricating oil nine special physical and chemical properties

In addition to the general physical and chemical properties, each of the lubricating oils of the company should also have special physicochemical properties that characterize its use. The higher the quality requirements or the more specialized oil products, the more prominent their special physical and chemical properties.

1. Oxidation stability Oxidation stability describes the anti-aging properties of greases. Some industrial greases with a long service life have this index requirement, and thus have become a special performance required for these types of oil products. There are many methods for determining the oxidation stability of oils. Basically, a certain amount of oil is oxidized at a certain temperature for a certain period of time in the presence of air (or oxygen) and a metal catalyst, and then the acid value and viscosity of the oil are determined. Changes and the formation of sediments. All the greases of Guangzhou Huanrun Co., Ltd. have different auto oxidation trends depending on their chemical composition and the external conditions. With the use of the process of oxidation occurs, and gradually generate some of the aldehydes, ketones, acids and gums, asphaltenes and other substances, oxidation stability is to inhibit the above-mentioned substances that are not conducive to the use of oil production.

2. Hydrolysis stability and hydrolytic stability Characterize the stability of oil products under the action of water and metals (mainly copper). Manager Wang R&D engineer of Guangzhou Huanrun New Material Technology Co., Ltd. suggests that when the oil product has a high acid value or contains When water is easily decomposed into additives for acidic substances, this indicator will often fail. It is determined by adding a certain amount of water to the test oil, mixing and stirring at a certain temperature for a certain period of time, and then measuring the acid value of the aqueous layer and the weight loss of the copper sheet.

3, anti-emulsification Industrial grease is often inevitably mixed with some cooling water in use, if the anti-emulsification of the grease is not good, it will form emulsion with the mixed water, so that water is not easy to release from the bottom of the circulating oil tank , which may cause poor lubrication. Therefore, anti-emulsification is a very important physicochemical property of Guangzhou Huanrun Industrial Grease. General oil is 40ml test oil and 40ml distilled water at a certain temperature and vigorous stirring for a certain period of time, and then observe the oil layer - water layer - emulsified layer separated into 40-37-3ml time; industrial gear oil is the test oil and water, Stir for 5 minutes at a constant temperature and 6000 rpm for 5 hours. Measure the ml of oil, water, and emulsion.

4. Thermal stability The thermal stability indicates the high temperature capability of the oil, ie the resistance of the grease to thermal decomposition, ie the thermal decomposition temperature. Some high-quality anti-wear hydraulic oils, compressor oils, etc. have all proposed thermal stability requirements. The thermal stability of Guangzhou Huanrun New Material Technology Co., Ltd. depends on the composition of the base oil. Many additives with lower decomposition temperatures often have adverse effects on the stability of the oil; antioxidants also do not significantly improve the quality of the oil. Thermal stability.

5, anti-foaming grease in the operation process, due to the presence of air, often produce a bubble, especially when the oil contains additives with surface activity, it is more likely to produce foam, and the foam is not easy to disappear. Guangzhou Huanrun New Material Technology Co., Ltd. will produce foam in the use of grease to damage the oil film, cause the friction surface to sinter or increase the wear, and promote the oxidation and deterioration of the grease, but also make the lubrication system air resistance, affect the grease circulation. Therefore, the anti-foam property is an important quality indicator for greases and the like.

6. Air release value The hydraulic oil standard has this requirement, because in the hydraulic system, if the air dissolved in the oil can not be released in time, then it will affect the accuracy and sensitivity of the hydraulic transmission. When it is severe, it can not be satisfied. Hydraulic system requirements. The method for measuring this property is similar to the anti-foaming property, but it is to measure the release time of the air (fog) dissolved in the oil.

7, rubber sealing In the hydraulic system, rubber seals are mostly, in the machinery of the oil inevitably with some seals, rubber seal poor oil can make the rubber swell, shrink, harden, Cracking affects its sealability and therefore requires better adaptability of oil and rubber. The hydraulic oil standard requires a rubber sealability index, which is a measure of the change in the size of a rubber ring after it has been immersed in oil for a certain period of time. The seal grease developed by Guangzhou Huanrun New Material Technology Co., Ltd. can also be applied to waterproof, seal lubrication and anti-corrosion of valves, cocks, plungers, gaskets, seals and wedge sealers.

8. Oiliness and extreme pressure oiliness are the polar substances in the grease, which form a firm physical and chemical adsorption film on the metal surface of the friction part, so as to play a role of high load and anti-friction wear, and extreme pressure is the grease. The polar substances on the metal surface of the friction part are decomposed by frictional chemical action under high temperature and high load, and undergo frictional chemical reaction with the surface metal to form a soft (or plastic) extreme pressure film with a low melting point. To impact resistance, high load and high temperature lubrication.

9, corrosion and corrosion due to the oxidation of oil products or additives, often cause corrosion of steel and other non-ferrous metals. The corrosion test is generally performed by placing copper strips in oil and placing them at 100°C for 3 hours, and then observing the change in copper. The corrosion test is based on the effect of water and water vapor on the surface of the steel. The corrosion resistance is determined. 30 ml of distilled water or artificial seawater was added to 300 ml of the test oil, and the steel rod was placed therein, and the steel rod was stirred at 54° C. for 24 hours, and then the steel rod was observed for rust. Oil products should have anti-metal corrosion and anti-corrosion effects. In the industrial grease standards of Guangzhou Huanrun New Material Technology Co., Ltd., these two items are usually mandatory items.