مرکز منطقه ای اطلاع رساني علوم و فناوري - Microencapsulation of Commercial Scents by Melamine formaldehyde Resin and Investigation of Its Stability

Abstract :

In this study, some fragrances (essential oils) which used in the softening were encapsulated bymelamine formaldehyde resins. Yield, the sizes and wall thicknesses of the microcapsules and theirstability at room temperature were investigated. Melamine formaldehyde (MF), the main componentof the capsule shell, was synthesized at a ratio of 1/5 (mol/mol), at pH= 9.0, at a temperature of 80 and 90 °C, and at 30 and 45 minutes of reaction time. The optimum stable conditions of microspheres of 4 different industrial using fragrances were determined by using emulsifying agents. Emulsion mixture, MF resins and acrylic acid acrylamide copolymer were mixed in a fixed time and temperature in order to obtain microns size microcapsules. Synthesized MF resins were characterized by FT‐IR spectroscopy, microcapsule size and stability of emulsified droplets were checked by optical microscope, size and wall thickness of the capsules were determined by scanning electron microscope and thermal stability of the capsules was examined by differential scanning calorimetry. The obtained yield of the capsules is 85‐ 89%, capsule wall size is between 190 to 426 nm and active substance loss at 20 °C in the microcapsules is between 45‐56 %.