Castor oil is a triglyceride of fatty acids. Castor oil is found in castor seeds and its content is 35% to 57.%.” It is extracted by squeezing or solvent Castor oil is prepared by the French method. It is an almost colorless or slightly yellow clear and viscous liquid with a slight odor; the taste is light and then slightly pungent.
Castor oil contains a large amount of ricinoleic acid (more than 80%) , so it has many unique properties:
1. Easily soluble in ethanol, but difficult to dissolve in petroleum ether. The existence of this characteristic makes it easier to distinguish castor oil from other oils.
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2. The viscosity is much higher than that of ordinary grease. It is 680CPS at 25°C, the viscosity index is 84, and the friction coefficient is very low (0.1). Castor oil has good fluidity, and refined castor oil can still flow at 22°C. -50 has no turbidity after rapid cooling. It is an ideal lubricating oil for aviation and high-speed machinery and an excellent protective oil for power belts.
3. It has strong optical activity because its main fatty acid – castor oil The asymmetric carbon atom in the acid is after position 12.
4. The dielectric constant is 4.30, which is the highest among common oils.
5. The relative density and acetyl content of castor oil Values are greater than those of ordinary grease.
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