The fundamental effect on a smooth use smooth fat

On smooth, especially the mechanism of the soap base grease smooth smooth, many scholars to stop a lot of research work, but, so far no unified understanding, remains to be further discussion to deal with in the future. General speaking, most scholars think that soap base grease is smooth metal soap and stay in the warp and woof of soap inside the oil absorption form a three-dimensional network structure of the system. According to the soap - Oil gel particle dispersions concept can think, smooth fat is a soap base oil as the dispersing medium and soap - Oil gel particles for the structure of the dispersed phase dispersed system. Therefore, the smooth fat smooth mechanism has the following values. Usually think that, as a result of the action of metallic soap or thickener took root oil to the action of friction pair of contact surface, the root oil on the surface smooth release and stop by external force. The idea that only see real smooth effect on root oil, only on the basis of the following experimental results, which is different the warp and woof of bowl of thickening agent the same oil obtained by smooth fat, its friction coefficient is the same. Another idea thought, root oil with thickener can smooth effect. This is based on the warp and woof of smooth fat and separate oil according to the result of the experiment, and the smooth performance of smooth fat and bleaching agent of the relationship between the shear strength. Compare with the idea of comprehensive thought, smooth smooth fat effect, local is due to the effect of root oil, but more importantly depends on the special separation after pasting agent and root oil brought about by different oil butyl foundation and is different from the smooth performance of the thickener. 1) Thixotropy smooth fat is the most fundamental characteristics of thixotropy. When applying an external force, in gradually become soft, smooth and fat activity apparent viscosity decreased, but when at rest, after a period of time ( A very short) Again, the consistency ( Restore) This feature is called thixotropy. Smooth fat this characteristic, the resolution can be at the site of the oil is not suitable for smooth smooth smooth, and show its good performance. 2) Viscosity smooth fat often make a similar viscosity or apparent viscosity, said in a clear smooth fat viscosity, must indicate the temperature and shear rate. Similar viscosity index can be used to control its activity at low temperature and pumping. 3) Ultimate strength ultimate strength smooth fat refers to make up the minimum shear stress required sample start activities, also called ultimate shear stress. Smooth fat ultimate strength is a function of temperature, the higher the temperature of fat, the smaller the ultimate strength, temperature is reduced, the ultimate strength of bigger, it depends on the size of the varieties and content of thickener, and lipid process conditions also have a certain relationship. 4) Low temperature activity fat weigh the smooth performance at low temperature is one of the important index of low temperature torque, namely at low temperature ( - 20 ° c below) Smooth fat block low-speed bearing rotation level, smooth fat low temperature torque by the starting torque and rotation torque of the uniform value after 60 mm. 5) Smooth fat drop point under the condition of rules known as drop point the lowest temperature reached a certain activity. Smooth fat drop point helps to identify smooth fat type and smooth rough estimate highest use temperature of the fat, general speaking, about the soap base grease, its point of use temperature should be lower than drop 20 ~ 30 ° c drop point is higher, its the better heat resistance. 6) The evaporative (evaporative smooth fat C) Said smooth fat during long-term use under condition of high temperature, smooth the fat level of volatile, evaporative as small as possible. The evaporative mainly depends on the nature of the smooth oil grease and fraction. 7) Colloid stability smooth grease colloid stability refers to the smooth fat under certain temperature and pressure insist on colloid structure stability, avoid smooth oil separation performance, from the smooth lipid that is smooth and fat oil against points to. Usually the smooth fat precipitation conversion for the mass fraction to indicate the number of oil. Colloid stability has a smooth smooth fat fat and practice application in long-term storage at the tendency of oil, and if the smooth grease colloid stability is poor, is under the action of heat and pressure, the centripetal force attack serious points oil easily, cause life reduced sharply, and make fat thick and dry, smooth smooth effect. 8) Oxidation stability oxidation stability refers to the smooth fat in long-term storage or long-term high temperature using the function of resist heat and oxygen, sticking to its nature can not attack for change. Often due to oxidation, seizure free alkali content reduced or free organic acid content increases, drop point landing, dark appearance, present different smell, consistency, ultimate strength, viscosity similar to land, and destroy smooth lipid structure generated corrosive substances, form black oil separation. In smooth fat storage for a long time, therefore, should be sent there are dry and ventilated environment, avoid sun exposure, and shall regularly check free base or free change of the project such as organic acid, corrosion resistance, to ensure its quality and performance