Abstract
The development of polyurethane with hydroxyl access in a molecule leads to a new alternative of low toxicity green product. Palm oil is one of the major commodities in Malaysia. The potential of palm oil to be used as coatings raw material such as alkyd is limited due to low unsaturated side on fatty acid chains. To overcome this limitation, palm oil was modified through transesterification process to produce polyol. Acrylated isocyanate (urethane oligomer) was then grafted onto polyol to produce polyurethane with vinylic ends. The polyurethane was formulated with different cross-linkers (reactive diluents) and cured under UV radiation. The effect of three different diluents; monoacrylate, diacrylate and triacrylate on the properties of cured polymer were studied in this research. Fourier Transform Infrared (FTIR), Hydroxyl Value Titration, Gel Content, and Volatile Organic Compound (VOC) were used for characterization. Physical testing performed were Pencil Hardness and Pull-Off Adhesion test. Novel palm oil-based polyurethane coatings have been found to have good properties with mono acrylate functionality.
Highlights
Polyurethanes are versatile class of polymers with variety of applications, because their properties can be modified by varying the components from which they are constructed [1]
Isophorone diisocyanate (IPDI) was monoacrylated with 2-hydroxylethyl acrylate (HEA) to form urethane oligomer, which was later grafted onto polyol to produce polyurethane with vinylic ends
The formation of urethane oligomer was done by charging one mole IPDI and one mole HEA into multi-neck reaction flask. 1% DBTL was used as catalyst and 0.5% hydroquinone was added to inhibit further reaction
Summary
Polyurethanes are versatile class of polymers with variety of applications, because their properties can be modified by varying the components from which they are constructed [1]. Polyurethanes have been used in adhesive and coating industry for a long time. Since the conventional polyurethanes are petroleum based, the utilization of renewable resources to produce environmental friendly coatings is gaining popularity [2]. Oils and fats of vegetables and animals can be utilized as alternative raw materials. They offer huge number of possibilities in chemistry which rarely can be met by petrochemicals [3]. Vegetable oils contain unsaturation on fatty acids bond which have potential in synthesis of biopolymers [4]. MATEC Web of Conferences in producing polyurethane. Isophorone diisocyanate (IPDI) was monoacrylated with 2-hydroxylethyl acrylate (HEA) to form urethane oligomer, which was later grafted onto polyol to produce polyurethane with vinylic ends.
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