Smooth the viscosity of the grease to use performance impact

Smooth oil viscosity decreases with the increase of temperature, so the same kind of smooth oil, owing to the different temperature, different viscosity. This stay is called 'viscosity Temperature characteristic '. Smooth fat - glue More complicated than the smooth oil temperature properties, viscosity - because of this structure system Also changes with the change of shear force and temperature characteristics. Under a certain temperature of smooth fat viscosity changes with the change of shear velocity is variable. This is called similar viscosity, viscosity international unit of measurement for palmer ( Card) 。 Seconds ( Pa• s) 。 Similar viscosity smooth fat don't obey the law of Newton fluid activity, decreased with increasing the shear rate. Due to the relative motion between the smooth lipid layers, skeleton structure was destroyed, so the higher the shear rate and skeleton structure destroy the more heavy, smooth similar viscosity reducing of fat. When the shear rate continues to increase, smooth fat similar viscosity since he no longer changes close to the root oil viscosity, and adhere to Newton fluid properties. Smooth fat called the change rule of similar viscosity and shear rate viscosity Speed characteristic. An increasingly bitter viscosity change with shear rate, the energy loss. Ordinary can smooth fat similar based on low temperature viscosity permitted to sure the grease used in low temperature limit. Smooth fat similar viscosity with temperature rise and land, but relatively slow, only one of several one percent or thousands of points for root oil. Due to the activity of smooth fat resistance, a local is a skeleton structure strength of the resolution, and skeleton structure is affected by temperature, smaller so smooth fat - glue Temperature characteristic is better than smooth oil. — Generally speaking, smooth fat in using the temperature range of viscosity change is a lot smaller than root oil. Viscosity and smooth fat Thickener used in the temperature properties resolution to the features and usage, and phase properties of soap oil system, and the relation with root oil viscosity is smaller. The nature of the smooth fat viscosity change with shear rate, make it on the mechanical speed change often use special compliance. When high speed, smooth agent request of low viscosity, then smooth lipid structure destruction intensified, fiber orientation, lower viscosity. When speed slow request viscosity is bigger, smooth agent and smooth and fat in low shear rate viscosity match. Smooth fat viscosity changing with the shear rate was agree with mechanical speed change on viscosity of smooth agent request. Smooth and fat in the viscosity of the shear velocity is very small and has a lot to do with the starting of smooth friction parts. Due to smooth fat viscosity in cutting speed hours, so at this time as smooth fat stick through the congress to increase the starting resistance. Smooth the viscosity of the grease increases, especially in the low temperature will make starting at low temperature were affected more, difficult to formation. Practice on machine starts, smooth fat restraint force needed for the resistance in the activity of shear velocity hours is much bigger than restraint force needed for the ultimate strength. 5 pa ( 7 gf /平方厘米) 5 s - Resistance of 2452 pa (1 activity 25 gf / cm2) , thus, smooth and fat in low temperature and low shear rate viscosity on smooth and affected by the cold starting performance of grease. For low temperature or wide temperature range with smooth fat demand rule of its viscosity at low temperature.