The reaction product of palm oil and methanol is isopropyl palmitate. Isopropyl palmitate, also known as isopropyl hexadecanoate (ipp), is a low viscosity lipophilic nonionic surfactant. It is a colorless to yellowish oily liquid at room temperature, insoluble in water, and miscible with organic solvents such as ethanol, ether and grease. It has good spreadability, lubricity, moisture retention and air permeability. And excellent solubility and toner dispersibility. At the same time, it has a great influence on the appearance and color dispersion of the slurry.