Brief Overview on Bio-Based Adhesives and Sealants

Abstract

Adhesives and sealants (AS) are materials with excellent properties, versatility, and simple curing mechanisms, being widely used in different areas ranging from the construction to the medical sectors. Due to the fast-growing demand for petroleum-based products and the consequent negative environmental impact, there is an increasing need to develop novel and more sustainable sources to obtain raw materials (monomers). This reality is particularly relevant for AS industries, which are generally dependent on non-sustainable fossil raw materials. In this respect, biopolymers, such as cellulose, starch, lignin, or proteins, emerge as important alternatives. Nevertheless, substantial improvements and developments are still required in order to simplify the synthetic routes, as well as to improve the biopolymer stability and performance of these new bio-based AS formulations. This environmentally friendly strategy will hopefully lead to the future partial or even total replacement of non-renewable petroleum-based feedstock. In this brief overview, the general features of typical AS are reviewed and critically discussed regarding their drawbacks and advantages. Moreover, the challenges faced by novel and more ecological alternatives, in particular lignocellulose-based solutions, are highlighted.

Review on Adhesives and Surface Treatments for Structural Applications: Recent Developments on Sustainability and Implementation for Metal and Composite Substrates

“…This paper complements other reviews in the topic [ 4 , 5 , 6 , 7 , 8 , 9 , 10 ], by giving an overview of eco-friendly emergent adhesive technologies, surface treatments that precede the application of adhesives, new trends in adhesive waste management, including recycling and design for disassembly, and introduces new insights on the connection between Research & Development (R&D) efforts, industry standards and regulatory aspects, which unquestionably influence the roadmap of adhesives chemistry development.…”

“…Some estimations claim that over 20% of ABJ are used in construction (windows, doors, pipes, flooring, insulation, glazing, tiles, among others). However, other applications have emerged, such as those in the fields of electronics, energy, marine, automotive, and aerospace industries [ 2 , 10 , 14 ].…”

“…Currently, there is a wide variety of eco-friendly adhesives and sealants, based on cellulose, starch, lignin, vegetable oil, and protein-based silanes, which are yet mainly employed for non-structural applications. Investment and advances on biopolymer production and processing can lead to a decrease of manufacturing costs, while creating new “green” businesses opportunities [ 4 , 10 ].…”

Hydroxypropyl Cellulose Adhesives for Transfer Printing of Carbon Nanotubes and Metallic Nanostructures

“…Cellulose-based materials meet most of the requirements of a good adhesive, due to their semicrystalline structure and complex network of interactions, both hydrophilic (such as hydrogen bonding) and hydrophobic. [32] HPC solutions in water and alcohol, for instance, are currently implemented as ecofriendly glues for leather binding and paper restoration (e.g., KlucelG). Bioadhesive properties of HPC films to human skin have also been already demonstrated both in liquid crystalline solutions [33] and in hot-melt extruded films.…”

An Investigation of Using Thermoset Polymer Type Liquid Additives to Improve Cement Grout Performances in Rock Bolting Applications

“…One of the polymer products is a silicone mastic sealant (SMS), and another product used in this study is a modified silicone polymer which is called as MS Polymer. Silicone sealants are liquid adhesives in a gel form before their polymerization and resistant to weathering due to the moisture [4,5]. The MS Polymer is an improved silicone product and has higher strength and adhesion performances than ordinary silicone materials [6,7].…”