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Author(s): L. Carvalho
F. Pereira
N. Paiva
J. Ferra
J. M. Martins
F. Magalhães
Title: Natural additives for reducing formaldehyde emissions in urea-formaldehyde resins
Issue Date: 2015-07-15
Abstract: Wood has followed mankind throughout its evolution. The development of science has led to theemergence of wood based products, whose main raw material is wood waste/residues and a bindersystem usually called resin or adhesive. One of the most important classes of wood based panels isparticleboard, which is mainly produced with urea-formaldehyde (UF) resins.UF resins represent 80% of the total production of amino resins due to their various advantages, suchas good performance, low cost and high reactivity. However, these resins and their products emitformaldehyde, both due to the presence of non-reacted formaldehyde and due to the hydrolyticdegradation of the polymer [1, 2].In 2004, this problem became even more pertinent due to the reclassification of formaldehyde by theInternational Agency of Research on Cancer (IARC) as a carcinogenic to humans, Group 1 [3]. Thisway, methods such as lowering the molar ratio of formaldehyde to urea (F/U) of the resins, one of themost used at the industry level, have become insufficient to meet the market requirements [4]. Thus,new efforts have been taken to deal with this challenge. The use of formaldehyde scavengers both inthe synthesis of resins and in the production of the wood-based panels has been one of the most studiedmethods [5].In the past 10 years, the concept of bioadhesives has emerged, which, in a very simplified way, is basedin the incorporation of bio molecules in the synthesis of resins [6-9] or in the production of theparticleboards or, in a more radical approach, in the synthesis of a bio-based resin, as, for instance, soyor casein, among others [10].The main goal of this work is the incorporation of soy or, more specifically, soy protein, either directly inthe production of wood panels or in the synthesis of urea-formaldehyde resins, used in the productionof panels.
Source: 6th Workshop on Green Chemistry and Nanotechnologies in Polymer Chemistry
Document Type: Artigo em Livro de Atas de Conferência Internacional
Rights: openAccess
Appears in Collections:FEUP - Artigo em Livro de Atas de Conferência Internacional

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