Bio-Renewable Sources for Synthesis of Eco-Friendly Polyurethane Adhesives—Review

Gadhave, Ravindra V.; Mahanwar, Prakash A.; Gadekar, Pradeep T.

doi:10.4236/ojpchem.2017.74005

Cited by 32 publications

(26 citation statements)

References 115 publications

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“…Common adhesives such as urea, melamine, and phenol-formaldehyde are highly sensitive to hydrolysis and produce environmental and health problems due to volatilization of formaldehyde over the lifetime of product [8]. Compared to these commonly used adhesives, polyurethane (PU) adhesives have the demonstrated advantages of improved strength, lower curing temperatures, less press time, and no formaldehyde emissions [136].…”

Section: Lignin-based Polyurethanesmentioning

confidence: 99%

“…PU adhesives can possess some of the best performance characteristics of all adhesives, and they are particularly important in the production of engineered wood products (e.g., cross-laminated timber) as a binder [137]. They are colorless and moderately flexible and can be used for bonding wood, metal, glass, plastic, rubber, ceramic, sand, and textile fiber [8]. Some drawbacks associated with PU adhesives include high penetration of the adhesive into the wood, low resistance to delamination, and unsatisfactory gap filling properties.…”

Section: Lignin-based Polyurethanesmentioning

confidence: 99%

“…The diverse possibilities for chemical compositions provide an opportunity for the integration of novel, bio-based feedstocks into polyurethane products. The total or partial replacement of fossil-derived polymer precursors (i.e., isocyanates, polyols, and other additives) with renewable, bio-based feedstocks is one route to improve the sustainability of these products [8]. Lignins are a class of aromatic polymers that comprise one of the major components of the cell walls of plants and represent a large potential resource for renewable polymers.…”

Section: Introductionmentioning

confidence: 99%

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Lignin-Based Polyurethanes: Opportunities for Bio-Based Foams, Elastomers, Coatings and Adhesives

et al. 2019

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Polyurethane chemistry can yield diverse sets of polymeric materials exhibiting a wide range of properties for various applications and market segments. Utilizing lignin as a polyol presents an opportunity to incorporate a currently underutilized renewable aromatic polymer into these products. In this work, we will review the current state of technology for utilizing lignin as a polyol replacement in different polyurethane products. This will include a discussion of lignin structure, diversity, and modification during chemical pulping and cellulosic biofuels processes, approaches for lignin extraction, recovery, fractionation, and modification/functionalization. We will discuss the potential of incorporation of lignins into polyurethane products that include rigid and flexible foams, adhesives, coatings, and elastomers. Finally, we will discuss challenges in incorporating lignin in polyurethane formulations, potential solutions and approaches that have been taken to resolve those issues.

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Section: Lignin-based Polyurethanesmentioning

confidence: 99%

Section: Lignin-based Polyurethanesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Lignin-Based Polyurethanes: Opportunities for Bio-Based Foams, Elastomers, Coatings and Adhesives

et al. 2019

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“…Finally, epoxidation is the main approach to derive polyols from vegetable oils followed by ring-opening reactions. Various ring-opening agents can be used to convert epoxy into OH groups such as water, alcohol, acids, and amines [73,74]. Multi-isocyanate is another building block of PU.…”

Section: Pu Foammentioning

confidence: 99%

Flame Retardancy of Bio-Based Polyurethanes: Opportunities and Challenges

et al. 2020

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Sustainable polymers are emerging fast and have received much more attention in recent years compared to petro-sourced polymers. However, they inherently have low-quality properties, such as poor mechanical properties, and inadequate performance, such as high flammability. In general, two methods have been considered to tackle such drawbacks: (i) reinforcement of sustainable polymers with additives; and (ii) modification of chemical structure by architectural manipulation so as to modify polymers for advanced applications. Development and management of bio-based polyurethanes with flame-retardant properties have been at the core of attention in recent years. Bio-based polyurethanes are currently prepared from renewable, bio-based sources such as vegetable oils. They are used in a wide range of applications including coatings and foams. However, they are highly flammable, and their further development is dependent on their flame retardancy. The aim of the present review is to investigate recent advances in the development of flame-retardant bio-based polyurethanes. Chemical structures of bio-based flame-retardant polyurethanes have been studied and explained from the point of view of flame retardancy. Moreover, various strategies for improving the flame retardancy of bio-based polyurethanes as well as reactive and additive flame-retardant solutions are discussed.

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“…Commercially available lignins are, most often, Kraft, soda and lignosulfonates associated to the corresponding most commonly used industrial processes for wood delignification and fibres isolation [15]. Especially, the lignin PU foam modified by 3-chloro-1,2-epoxypropane had the highest glass transition temperature which was indicating that it had a better thermal stability and could be applied in the heat resistant field [28] [29].…”

Section: Type Of Ligninsmentioning

confidence: 99%

Lignin-Polyurethane Based Biodegradable Foam

Gadhave¹,

Mahanwar²,

Gadekar³

2018

OJPChem

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Natural sources like starch and lignin used during manufacturing of polyurethane (PU) foam have been used extensively from last decades and replaced petro-chemical based PU foam due to their lower environmental impact, easy availability, low cost and biodegradability. Bio-renewable sources, such as lignin which is an abundant, underutilized component of cellulosic biomass, constitute a rich source of polyol which are being considered as polyol for the production of "eco-friendly and bio-degradable" PU foam. Lignin was mainly used for production of high fungal degradable polyurethane foams, followed by elastomers as well as wood adhesives. This review paper will focus on the progress of research in lignin based polyurethane materials for foam application.

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Bio-Renewable Sources for Synthesis of Eco-Friendly Polyurethane Adhesives—Review

Cited by 32 publications

References 115 publications

Lignin-Based Polyurethanes: Opportunities for Bio-Based Foams, Elastomers, Coatings and Adhesives

Lignin-Based Polyurethanes: Opportunities for Bio-Based Foams, Elastomers, Coatings and Adhesives

Flame Retardancy of Bio-Based Polyurethanes: Opportunities and Challenges

Lignin-Polyurethane Based Biodegradable Foam

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