Abstract
The aim of the study was to evaluate the applicability and performance of polyglycerol- and sucrose-based polyols as components of a simplified formulation of polyurethane adhesives. Colloidal silica was used as a viscosity control and reinforcing agent. The adhesives were examined in terms of reactivity, thermal stability, viscosity, work of adhesion, wetting, surface energy, and bonding strength on wooden substrates. Silica was found to increase gelling time, but markedly improved bonding strength and adhesion with substrates. Bonded solid beech wood samples prepared at 80, 110, and 130 °C showed shear strengths between 7.1 MPa and 9.9 MPa with 100% wood failure. The renewable resource-based polyols were demonstrated to be useful in formulation of polyurethane adhesives for furniture industry—especially with silica as a filler.
Highlights
The research on bio-based or bio-derived adhesives and polyurethanes has been carried out for years [1,2,3,4,5,6,7,8]
In order to overcome the problem, the viscosity was adjusted to a practical range by using colloidal silica as the viscosity control agent
From the practical point of view the changes in thermal stability of the PURs can be neglected as inThe the area of their targetclearly application high thermal resistance is not presented results demonstrate that polyglycerolandrequired
Summary
The research on bio-based or bio-derived adhesives and polyurethanes has been carried out for years [1,2,3,4,5,6,7,8]. It is important to increase the content of bio-based components in PUR adhesives—preferably by substitution of petroleum-based polyols with renewable feedstock-derived ones. The convenient feedstock are glycerol and sucrose The former is a by-product from vegetable oils transformations to biodiesel [10,11] and the latter is produced in large amounts from sugarcane or sugar beet. Due to their renewability, bio-origin, low cost, and availability, both glycerol and sucrose have great potential as raw material for the development of new classes of polyurethanes [12,13,14]
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