Calcium sulfonate-based compound grease for high-temperature long-life low-noise bearing and preparation method of calcium sulfonate-based compound grease

Abstract

The invention discloses calcium sulfonate-based complex grease for a high-temperature long-service-life low-noise bearing and a preparation method of the calcium sulfonate-based complex grease, and belongs to the technical field of lubricating grease preparation. The complex grease consists of the following components in parts by weight: 60-75 parts of synthetic base oil; 20 to 35 parts of high base number sulfonate; 3-6 parts of a phase inversion agent; 3-8 parts of polyurea powder; 1-3 parts of a viscosity index improver, 1.5-4 parts of an anti-wear reagent at extreme pressure, 2-5 parts of an antifriction agent, 0.5-2 parts of an antirust agent, 0.5-2 parts of an antioxidant and 0.5-2 parts of a colloid structure stabilizer; the bearing grease with high dropping point, long service life and low noise is prepared through phase inversion, refining, blending and other processes. The calcium sulfonate-based grease is compounded with the polyurea lubricating grease, so that the soap content of the calcium sulfonate-based lubricating grease is reduced, the service life of a high-temperature bearing is remarkably prolonged, abrasion and equipment failure are reduced, and the use cost is reduced; the lubricating oil is suitable for lubricating and protecting bearings of household appliances, office equipment, precise instruments and various industrial machines which require low noise, rust prevention and long service life (even lifelong lubrication); the motor bearing lubrication device is also suitable for bearing lubrication on scooters, roller skates and bags, and can meet noise reduction, lubrication and protection of other small and medium-sized motor bearings.

Description

technical field [0001] The invention belongs to the technical field of grease preparation, and in particular relates to a calcium sulfonate-based composite grease for high temperature, long life and low noise bearings and a preparation method thereof. Background technique [0002] Low-noise grease is a fully purified grease. If impurities and contaminants enter the bearing or load-bearing parts, it may cause damage to these parts, while low-noise bearing grease has good noise reduction performance, which can effectively reduce The vibration value of the bearing meets the lubrication requirements of long life, low noise and low starting torque. In 2020, the total domestic production of bearings will reach 8 billion sets, each set of bearings is calculated as 0.5g according to the minimum grease filling amount, the consumption of bearing grease will reach 40,000 tons, and the high-end low-noise bearings are calculated as 160 million sets, with high performance and low noise. ...

AI Technical Summary

Problems solved by technology

However, due to the use of mineral base oils, this type of low-noise bearing grease is greatly compromised in some physical and chemical indicators other than rust removal and anti-rust performance

If the bearing life can only reach 200 hours, it will be difficult to test the starting and running torque at -20°C

The operating temperature of this type of grease is generally -20 to 120°C. When used at a high temperature above 150°C, the base oil will evaporate too quickly and the loss will be serious, which will greatly shorten the service life of the bearing.

In addition, if the particles enter the working area, they will damage the friction pair and reduce the working life

Low-noise grease can eliminate bearing noise by removing impurity particles or pollutants. These impurities or pollutants cause bearings to be scratched or shaft sleeves to be impacted. If the impurity content is too large, under the same working conditions, Interfere with the normal operation of moving parts, making their movements uncoordinated

This may shorten the life of the bearings and the stability of the motor

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