Air-drying bio-based polyurethane dispersion from cardanol: Synthesis and characterization of coatings

Green polyurethane from dimer acid based polyether polyols: Synthesis and characterization

“…Several small peaks for polyols were observed due to presence of substantial extent of tribasic and monobasic acid fractions with different molecular weight produced during polymerization. This type of side reaction such as self‐condensation of epoxy groups during synthesis was not unusual and also reported elsewhere . It was again found from Table , that the molecular weights of polyols estimated from titration method are 1140 and 1798 that fitted more closely to the targeted molecular weight values such as 1000 and 2000, compared to molecular weight of 1838, and 2470 as calculated from GPC.…”

“…A broad absorption band observed at around 3480 cm −1 for polyols (POLY 1000 and POLY 2000) prepared from DA confirms the presence of secondary hydroxyl groups in the molecular structure of polyols . Moreover, a newly formed sharp peak around 1110 cm −1 attributed to COH stretching vibration for secondary alcohol of polyols also indicates successful ring‐opening reaction of epoxy group of PO . The completion of reaction can be confirmed by the disappearance of peak in polyol samples around 2650 cm −1 representing the free carboxylic (COOH) groups in DA.…”

“…Therefore, an alternative route to prepare green PUs using renewable plant based polyols needs to be explored. One of the most frequently used renewable raw materials are cashew nut shell liquid for getting polyols . Vegetable oil has also been blended to prepared polyols as a starting material for Pus .…”

Effect of structure on the properties of polyurethanes based on aromatic cardanol-based polyols prepared by thiol-ene coupling

“…Through the reactive functional group of the benzene ring, phenolic hydroxyl group, and unsaturated alkyl long-chain, cardanol has been modified as monomers and polymers and have been widely used in many applications [12,13], such as phenolic resins [14], epoxy resins [15], vinyl ester polymers [16], phenalkamine curing agents [17], benzoxazine resins [18], surfactants [19], PU foam [20], and PUs [21][22][23][24][25][26]. Cardanol is mainly modified as cardanol-based polyols to prepare bio-based PUs with isocyanates; and the phenolic hydroxyl group is the most commonly used modification site [18][19][20][21][22][23][24][25][26]. The coupling of benzene ring only prepares types of cardanol-based polyols [26].…”

Development of Green Waterborne UV-Curable Castor Oil-Based Urethane Acrylate Coatings: Preparation and Property Analysis

“…[1][2][3][4][5][6] Radiationcurable polyurethane dispersions (referred to as UV-PUDs) have benefited over the past few years from growing attention by the market recognizing their high-end performance and strong potential. Eco-friendly coatings, such as high-solids coatings, powder coatings, waterborne coatings, and UV-curable coatings, have been developed to replace conventional solvent-borne coatings, and have made their way into the market with success.…”