Basic knowledge of rolling bearing grease - — Grease variety, composition and properties

Basic knowledge of rolling bearing grease - — 2020 - grease variety, composition and characteristics 10 - 18 1, composition of the grease, grease is composed of base oil, thickener, Thickener) Or soap base, additives ( Some species contain no additives) Mixture at high temperature. 1) Base oil base oil accounted for more than 70% of the total, base oil, mainly from the refinery special mineral oil, vegetable oil and synthetic. Synthetic oil with special application, for example, ultra gentle cryogenic circumstance, etc. Different composition of base oil, and some can be compatible with each other ( Can be used mixed together) , others are not compatible with each other, Can not be mixed together to use) 。 Not compatible with each other two kinds of base oil are mixed together, may lose lubrication, and even cause severe damage to the bearing. 2) Thickener or soap thickener, also known as thickening agent, it is the adsorption of lubricating oil additives and/or material. Thickener formed from soap or soap base. Its type determines the typical characteristics of the grease. Barium soap base with lithium, calcium, sodium, or aluminum as the foundation; The soap base with organic and inorganic solids, clay, polyurea and silica gel as the foundation. 3) Additives, additives are used to provide additional features, such as wear-resistant and anti-corrosion protection, reduce the effect of friction, and under the condition of boundary and mixed lubrication to prevent damage, etc. 2, the classification and basic performance of the grease the classification method has many of the grease, but the general according to the composition of the raw material of thickener, known as' & times; × Base grease ', such as' sodium based grease 'and' lithium base grease 'and' polyurea grease 'and so on. Commonly used types and their adaptable working temperature as shown in the table below. According to the adaptation of maximum and minimum temperature, also can be divided into ordinary grease, high temperature and low temperature grease grease, etc. Molybdenum disulfide grease is a solid lubricant containing 1 join the grease lubrication products made of ( Molybdenum disulfide accounted for 3% ~ 5%) 。 It can improve some performance of the original grease, for example, can reduce friction, improve the heat resistance, etc. Commonly used bearing the varieties of the grease, codes, the performance and use the following figure. 3, different composition of the compatibility of the grease in principle, the different components of grease are not allowed to mix. To this point in the bearing on the for the first time, it is very easy to do. But in the process of mechanical operation, supplement or replace the oil, is often because at that time can't find the original varieties or use other objective and subjective reasons and use a variety of grease, cause the result of the mixture of different composition. After different ingredients to mix, without exception, sometimes sometimes appear oil dilution or harden, the phenomenon such as color, reduce the lubrication, finally damage the bearings. Appear afore-mentioned different results, mainly relates to compatibility problems between different components of grease. Grease base oil is compatible with commonly used commonly used grease increases the dispensing compatibility table: '+' for compatibility; “× 'is incompatible; ”? 'for testing according to the report the situation to decide. Listed in the table for particular attention must be paid to incompatible species. （ Source: the journal bearing)