Abstract
Bio-renewable sources used during manufacturing of polyurethane (PU) adhesives have been used extensively from last few decades and replaced petrochemical based PU adhesive due to their lower environmental impact, easy availability, low cost and biodegradability. Bio-renewable sources, such as vegetable oils (like palm oil, castor oil, jatropha oil, soybean oil), lactic acid, potato starch and other bio-renewable sources, constitute a rich source for the synthesis of polyols which are being considered for the production of “eco-friendly” PU adhesives. Various bio-renewable sources for synthesis of bio-based PU adhesives and their potential applications are discussed in this review. This paper will focus on the progress of research in bio-based materials for adhesive application.
Highlights
Polyurethanes are up to date the most versatile polymers due to the flexibility of structure design at the application site
Various bio-renewable sources for synthesis of bio-based PU adhesives and their potential applications are discussed in this review
PU adhesive was prepared from palm oil-based polyester polyol [32] [131] that was synthesized by ring-opening reaction of epoxidized palm olein with phthalic acid
Summary
Polyurethanes are up to date the most versatile polymers due to the flexibility of structure design at the application site They are mainly used in footwear, packaging, automotive industry and furniture assembly in the form of rigid and flexible foams, coatings, adhesives, sealants, elastomers and binders. Polyurethane as wood adhesives has developed a reputation for reliability and high performance [11] [12]. Adhesives based on urea-formaldehyde, melamine formaldehyde, urea melamine formaldehyde and phenol-formaldehyde are commonly used [16] [17] [18], but are very sensitive to hydrolysis [19] [20] [21] These adhesives produce health hazards because of the formaldehyde they release [22]. This paper will focus on the progress of research in bio-renewable sources for adhesive application
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