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ABSTRACT
Conventionally, polyurethanes are synthesized by step growth polymerization of diols (or polyols) and diisocyanates (or polyisocyanates). The variety of isocyanates and polyols makes it possible to generate a wide range of materials with different properties. Despite the many advantages of polyurethanes, their synthesis can raise issues due to the toxicity of isocyanates. In order to limit the risks for producers and users, non-isocyanate polyurethanes have been developed. The synthesis of such non-isocyanate polyurethanes, as well as properties and applications, mainly as adhesives for wood, are described in detail in this article.
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Read the articleAUTHOR
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Siham AMIROU: Research engineer - Laboratory for the study and research of wood materials (LERMAB) - University of Lorraine, Épinal, France
INTRODUCTION
Polyurethane adhesives (PUs) are widely used in various industries. Due to the chemical versatility of PUs, there are many different types of PU adhesive . These are generally synthesized by a polyaddition reaction between polyols and diisocyanates.
Urea-formaldehyde and phenol-formaldehyde resins, commonly used in wood adhesives , are highly sensitive to water and cause environmental and health problems due to the volatilization of formaldehyde over the lifetime of finished products . Polyacrylate adhesives are also used as wood adhesives, but they have certain disadvantages, such as higher costs and limited durability . Studies on the synthesis and use of different types of PUs as wood adhesives can also be found in...
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KEYWORDS
wood | adhesives | Polyurethane | non-isocyanate
CAN BE ALSO FOUND IN:
Home Materials Plastics and composites Development of biobased polyurethanes non-isocyanate (NIPUs) for wood adhesives
Home Innovations Technological innovations Development of biobased polyurethanes non-isocyanate (NIPUs) for wood adhesives
Home Materials Wood and paper Development of biobased polyurethanes non-isocyanate (NIPUs) for wood adhesives
Home Food–Chem–Bio industry processes Green chemistry Development of biobased polyurethanes non-isocyanate (NIPUs) for wood adhesives
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Functional materials - Bio-based materials
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Development of biobased isocyanate-free polyurethanes (NIPUs) for wood adhesives
Wood glues
Bibliography
Bibliography
Standards
- Panneaux de particules et panneaux de fibres. Détermination de la résistance à la traction perpendiculaire aux faces du panneau - NF EN 319 - 1993
- Plywood. Bonding quality. Part 2: Requirements - ISO 12466-2 - 2007
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