| Abstrakt: |
The development of more environmentally friendly paints and coatings has received a lot of attention recently. Because of environmental concerns, there has been resurgence in the utilization of renewable resources in production of several industrial commodities. They are available from naturally existing plants including castor, mustard, kernel, sunflower, cotton, linseed, etc.; they primarily contain triglycerides. production of polymers from cheap, readily available renewable resources. Triglyceride oils are heated or blasted by air to produce bodied or blown oils, which are used for coating, respectively. While the Diels-Alder reaction joined triglyceride molecules together in body oils, the combination of free radicals produced by the breakdown of hydroperoxides produces the same connections in body oils. The air-blowing procedure introduces these hydro peroxides. Triglyceride oils are utilised in the production of polymers to enhance end-product characteristics. Ricinoleic acid (12-Hydroxyoleic Acid), which is responsible for over 90% of the fatty acid composition, is exclusively found in castor oil, which is also a nontoxic, biodegradable, and renewable resource. Ricinoleic acid is a hydroxylated fatty acid containing 18 carbons and one double bond. In this work, Maleic anhydride modified castor oil (MACO) had been created utilizing varying weight percentages of maleic anhydride (MA) and castor oil (CO) in the presence of the catalyst azobisiso-butyronitrile (AIBN). FT-IR, 1H-NMR, and iodine value were used to monitor the synthesis of MACO. The various MACO Polyurethanes (MACOPU) coatings were then created utilizing Isophorone diisocyanate (IPDI) and MACO in a 1.6:1 NCO/OH equivalence ratio. The MACOPU's structure has been verified by 1H, 13C NMR, and FT-IR spectroscopy. By using FT-IR, XRD, TGA, DSC, DMTA, GPC, UTM, SEM, contact angles, and properties of dispersion techniques, the characteristics of the coating-free films were investigated. The thermogravimetric study results revealed that as the MA content rises, the MACOPU's thermal stability changes. As the weight% addition of MA increased, so did the MACOPU's glass-transition temperature (Tg). With the addition of MA being added less often, improvements were seen in the contact angle and water observation. [ABSTRACT FROM AUTHOR] |
