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润滑脂变质的原因都有哪些?

润滑脂变质的原因都有哪些?今天小编为您解答这个问题,一起来了解吧。
What are the reasons for the deterioration of grease? Today Xiaobian answers this question for you and comes to understand it.
润滑脂变质的原因主要有两方面:一方面是化学变化,如基础油氧化变质和大量分油,以及组分中所含添加剂有效成分的减少等;另一方面是物理变化,如润滑油脂稠度的增大或减小,滴点下降等。而变质的快慢是决定润润滑油脂使用寿命的基本根据。
There are two main reasons for grease deterioration: on the one hand, chemical changes, such as oxidation of base oil and a large amount of oil, and the composition of additives in the effective components of the reduction, etc. On the other hand, physical changes, such as the thickening of lubricating grease increase or decrease, drop point decline, and so on. The speed of deterioration is the basis for determining the service life of lubricating grease.
化学变质
Chemical metamorphism
山东变压器油
润滑油脂在使用过程中受热而促进其氧化变质的反应,使基础油的粘度增大,酸值增高,氧化物增加,稠化剂的结构破坏,导致润滑脂软化并大量分油而缩短使用寿命。同样地,也有因氧化变质而硬化,从金属表面上脱落,润滑脂不能再使用。因此,为了抑止或延长滑润脂的热氧化变质,都要求添加抗氧添加剂。
Lubricating grease is heated in the course of use to promote its oxidation and deterioration reaction, so that the viscosity of base oil increased, acid value increased, oxides increased, thickener structure damage, resulting in softening grease and a large number of oil and shorten the service life. Similarly, there is also hardening due to oxidation deterioration, from the surface of the metal, grease can no longer be used. Therefore, in order to suppress or prolong the thermal oxidative deterioration of lubricating grease, it is necessary to add antioxidant additives.
物理变质
Physical metamorphism
滑油脂在使用过程中受到机械的揉搓和搅拌,经常处于被剪切的过程中,按其剪切安定性的好坏而造成不同程度的稠度下降,随机械的搅拌作用而使其结构破坏而导致软化并大量分油,同时由于轴颈的高速转动所产生离心力的作用,也易使基础油发生大量分油,润滑油脂变硬而不能使用。
The grease is often in the process of being sheared when it is rubbed and stirred mechanically. The consistency decreases in different degrees according to its shearing stability. The structure of the grease is destroyed by random mechanical stirring, which leads to softening and a large amount of oil separation. At the same time, the centrifugal force produced by the high-speed rotation of the journal is produced. It also makes it easy for the base oil to take a lot of oil and grease to harden and not to be used.
水分的影响
Effect of moisture
水分可使某些润滑油脂(如钠基润滑脂)乳化变质,甚至影响使用中对金属部件的锈蚀性能。水分还可以加速润滑油脂的氧化变质,促使润滑油脂软化,稠度增大。有的试验结果表明,即或是贪0.01%的微量水分也对轴承有不良影响。
Moisture can emulsify and deteriorate some lubricating oils, such as sodium-based grease, and even affect the corrosion of metal parts in use. Water can also accelerate the oxidation and deterioration of lubricating oils, which will help to soften the grease and increase the consistency. Some test results indicate that even the moisture content of 0.01% is bad for bearing.
有害气体的影响
Effects of harmful gases
一些破性或碱性气体对所用轴承润滑脂起恶化作用,同时对轴承起腐蚀作用,特别是在有水分的情况下,会进一步加速润滑油脂变质和增加对轴承的腐蚀作用。
Some breaking or alkaline gases deteriorate the grease used in the bearing and corrode the bearing, especially in the presence of moisture, further accelerating the deterioration of the grease and increasing the corrosion of the bearing.
真空度的影响
Influence of vacuum degree
高真空对润滑油脂的蒸发量影响大,同时使摩擦系数显著增大甚至造成摩擦面的烧结。因此,在高真空下使用的润滑油脂应选用蒸发量小的硅油作基础油。
High vacuum has a great influence on the evaporation of lubricating grease, at the same time, the friction coefficient increases significantly and even causes the sintering of friction surface. Therefore, silicone oil should be used as base oil in high vacuum.
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