Most of the motor manufacturers use the insulating paint to volatilize the acid components mainly: four: unreacted low molecular paint raw material acid components (anhydrous and terephthalic acid, anhydrous maleic acid, trans Butylene diacid). 2 The acid component formed during curing of the paint (from formaldehyde to carboxylic acid, from formaldehyde to formic acid). 3 Lower fatty acids (formic acid, acetic acid) produced by thermal or oxidative decomposition. 4 The acid component of the cured product after water decomposition. The main acid component produced by the insulating varnish is formic acid, and the amount of formic acid generated is closely related to the degree of rust occurrence. The grease adsorbs the acidic components volatilized in the paint, causing the grease to deteriorate, and this acidic component promotes the hydrolysis of the oil, resulting in an increase in the concentration of the acidic component, causing the NSK bearing to rust.
The working principle of the grease is to separate the steel ball from the inner and outer raceways by using the grease layer. The viscosity characteristics of the grease are attached to the steel ball and the raceway surface, separating the metal interface between the steel ball and the inner and outer raceways, and reducing the metal surface. Wears and protects the metal from air and moisture, reduces vibration and noise, and allows the bearing to rotate smoothly. However, after the grease is degraded, the viscosity will change, the oil film will break through, and the separation function and adhesion characteristics of the grease will disappear. The consequence of this is that the acidic component produced by the insulating paint directly oxidizes the metal surface, causing the bearing to rust. The second is that the steel ball is in direct contact with the inner and outer raceways, and wear occurs during rotation, which causes noise increase.
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