Polyols and Rigid Polyurethane Foams from Cashew Nut Shell Liquid |
| |
Authors: | Mihail Ionescu Xianmei Wan Nikola Bili? Zoran S Petrovi? |
| |
Institution: | 1. Kansas Polymer Research Center, Pittsburg State University, 1701 South Broadway, Pittsburg, KS, 66762, USA
|
| |
Abstract: | Cashew nut shell liquid (CNSL) is a natural aromatic oil consisting of a mixture of phenolic structures with a carboxyl group in ortho position and substituted in meta position with a hydrocarbon chain of 15 carbon atoms. The major component of CNSL is anacardic acid (90?%), which is easily decarboxylated to cardanol by distillation. The present work describes the synthesis of new biobased Mannich polyols for rigid polyurethane foams in two steps: synthesis of Mannich bases by reacting phenolic ring of cardanol with N-(2-hydroxyethyl)-1,3-oxazolidine followed by alkoxylation reactions. The polyols were characterized by wet methods (hydroxyl numbers, viscosity, acid value, density, water content, iodine value etc.), spectroscopic methods (FT-IR, 1H NMR and 13C NMR) and by Gel Permeation Chromatography. The Mannich polyols from cardanol are excellent replacements for petrochemical derived Mannich polyols based on nonyl phenol. Cardanol-based polyols were used successfully for the preparation of rigid polyurethane foams of good physical?Cmechanical and fireproofing properties. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|