High-temperature no-dropping-point lubricating grease and production technique thereof

Abstract

The invention relates to a high-temperature no-dropping-point lubricating grease and a production technique thereof. The high-temperature no-dropping-point lubricating grease is prepared from the following components in parts by weight: 13.7-84.4 parts of base oil, 5-15 parts of bentonite thickener, 5-50 parts of composite calcium sulfonate lubricating grease, 5-20 parts of tackifier, 0.5-1 part of antioxidant and 0.1-0.3 part of metal deactivator. The preparation method of the composite calcium sulfonate lubricating grease comprises the following steps: converting superhigh-base-number calcium sulfonate with a conversion agent at 60-100 DEG C for 20-60 minutes until the superhigh-base-number calcium sulfonate becomes obviously thickened, and heating to 140-180 DEG C to remove water. The high-temperature no-dropping-point lubricating grease has the advantages of long grease addition period and wide adaptability, and can be used in high-temperature positions; and at high temperature, the high-temperature no-dropping-point lubricating grease also has the advantages of no coking, light discolorment, less oil bleeding, low loss and longer service life.

Description

technical field [0001] The invention relates to a lubricating grease and a production process thereof. Background technique [0002] Bearings or gear parts of steel plants, automotive paint conveyor chains, paper mills, refractory plants, chemical plants, machining and other equipment, many parts are lubricated by grease, and the operating temperature is very high, generally around 150-250 °C. [0003] High-temperature lubricating parts: such as bearings of coke cars in coking plants, bearings of furnace front and furnace top equipment in ironmaking plants, continuous casting machine bearings in steelmaking plants, gears of vertical reducers, racks of flame cutting machines, hot-rolled strip steel plants Furnace roller bearings, hot coil box bearings, coiler bearings, work roll bearings in profile rolling mills, cooling bed bearings, furnace front roller bearings in wide and thick plate factories, heat treatment hearth roller bearings, drying and setting machines in paper mi...

AI Technical Summary

Problems solved by technology

[0004] Problems that are prone to occur in application: ordinary greases such as lithium-based grease, lithium-composite grease, urea-based grease, and aluminum-composite grease are limited by the improper selection of base oil and additives or the performance of the thickener itself , the performance in high temperature is not comprehensive enough, and under the condition of long lubrication cycle, it cannot fully meet the high temperature requirements of various equipment, and frequent lubrication failures occur, affecting normal production.

The specific manifestations are: large volatilization at high temperature, causing the remaining thickener to lose its lubricating effect, resulting in bearing damage; corrosion of the bearing at high temperature, reducing the service life of the bearing; severe thinning and loss after shearing, resulting in insufficient lubrication of the bearing; large oil separation at high temperature Severe loss causes lubrication failure; severe oxidation and discoloration at high temperature causes shortened service life; coking at high temperature causes bearing jamming or scrapping, etc.

In order to meet the lubrication requirements as much as possible, users sometimes increase the frequency of lubrication or the amount of grease supplied for forced lubrication. This approach has the following problems: the oil vapor generated by high temperature volatilization in a relatively closed environment may cause a fire risk; the amount of grease supplied is large. This will increase the amount of grease loss, and the lost grease will also cause a risk of fire when it encounters high-temperature parts. It will cause great harm to equipment bearings, electrified control systems, and hydraulic systems. In severe cases, it will endanger the entire production line.

[0005] Defects of various types of grease: the dropping point of lithium-based grease is low, generally around 180°C, and its long-term use temperature is 120°C

The dropping point of urea-based grease is relatively high, and the turbidity of long-term use is 150-180°C, but if it is baked above 200°C for 10 hours, the overall thickening and agglomeration is not ideal, but the base oil inside is not ideal after stirring and baking. Large loss, poor colloidal stability

The dropping point of composite aluminum-based grease is generally about 280°C, and if it is baked above 200°C for 10 hours, the base oil will lose a lot, the color will become darker, and the service life will be short