Currently, low-noise sealed bearing greases are roughly divided into three categories: general-purpose low-noise motor bearing greases, low-temperature high-speed bearing greases, and high-temperature long-life low-noise bearing greases.
1. General purpose low noise motor bearing grease (BX-300/B BX-300/A BX-136/series BX-120 series)
In the bearing industry, this kind of grease has the largest application, accounting for about 70% of the total grease consumption. Because this type of grease uses lithium soap with soft fibers and easy to filter as the thickening agent, and the use of mineral {TodayHot} oil as the base oil, it is easy to meet the requirements of low and medium-grade bearings to reduce the vibration value. Another advantage is that it has good pumpability, whether it is mechanical grease or manual grease application, it is simple and easy. Moreover, the low price of the grease can greatly reduce the cost of the bearing. However, due to the use of mineral base oils, this type of 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 is difficult to test the starting and running torque at -20°C. The use 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 fast and the loss will be serious, which will greatly shorten the life of the bearing.
2. Low temperature and high speed bearing grease (BX-300/F series BX-300/A(F) BX-800 series)
At present, the equipment using precision bearings is becoming more and more refined, and the grease used in the bearings must have the following properties:
1. It has the same operating life as the bearing, so as to extend the maintenance cycle as much as possible, shorten the downtime, and improve labor productivity.
2. Under the high speed of dn>5×105, ensure that the motor temperature rise is low and the oil is not thrown, thereby reducing power consumption and protecting the motor.
3. The impurity content is controlled under a certain standard to minimize the environmental pollution caused by equipment noise.
4. Ensure the flexibility of bearing starting and operation under ultra-low temperature working conditions, and ensure the minimum output power.
The grease company selects high-purity chemical synthetic oil and some special additives to develop and produce low-temperature and high-speed bearing grease in a high-clean environment and equipment. The disadvantage of this type of grease is that when used above 150℃, its life will drop sharply as the temperature rises, and its anti-load and impact ability is relatively weak. Avoid using it on medium and large bearings to prevent boundary lubrication. sintering.
3. High temperature, long life and low noise bearing grease (BX-306/E series BX-280/series BX-300/F(7018))
Grease used in high temperature and high speed environment should have the following characteristics:
1. No loss at high temperature, that is, it maintains a certain consistency and does not soften at a temperature of about 180°C.
2. Less grease leakage. When the grease is subjected to high-frequency repeated shearing {HotTag} cutting and large centrifugal force in the bearing, the lubrication can return to the raceway in time without being thrown out.
3. This type of grease must have a certain high-temperature service life, and have good oxidation resistance at high temperatures, so as to extend the life of bearings and related equipment.
4. It has a certain mute effect. Because the fiber of high temperature grease is generally harder, the mute performance in the bearing noise test is far inferior to that of lithium-based grease.
High-temperature long-life grease is generally divided into two types, one is lithium complex grease, BX289/3 has better high-temperature performance, but due to the addition of low-molecular-weight acid in the thickener crystal, the hardness of the fiber is increased. Large, it shows poor vibration performance in the bearing. However, by controlling the degree of polymerization, a product with a uniform molecular weight distribution is obtained, and this product is dispersed in the base oil by a special method to produce another grease with excellent noise performance and high temperature performance. The average dropping point of this grease is greater than 250°C, and the use temperature can reach about 200°C. The thickening agent crystal does not contain metal ions, the fiber hardness is small, and the noise performance is good. At the same time, due to the thermal coupling effect between its basic chemical components, high temperature grease is reduced. This high-temperature, high-speed, low-noise grease does not contain any metal ions that can cause catalysis and oxidation, and the thickening agent rich in nitrogen and oxygen atoms is also an antioxidant, so the bearing life and sound quality are better.
Dongguan Baoxing Lubricant Co., Ltd. is located in Dongguan, Guangdong, and is one of the leaders in the excellent special grease industry.
The company integrates R&D, production, sales, and service marketing to provide high-temperature bearing lubricants/bearing greases for Chinese and foreign customers. Applicable model: BX-308 series BX-300/A(F)BX-300/B
