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Theses

Mise au point de nouveaux adhésifs aminoplastiques pour panneaux de particules

Abstract : Our attention was essentially involved in improving the mechanical behaviour of particleboards in a wet environment, which is, in fact, the weakest point of aminoplastic resins widely used today. Some new methods have been explored to modify the properties of both Melamine-Urea-Formaldehyde (MUF) and Urea-Formaldehyde (UF) resins.As far as MUF resin is concerned, an excellent water resistance has been obtained by using a hardener, which is a mixture composed only of hexamethylenetetramine and a concentrated solution of sulphuric acid. This hardener has been analysed by [exponent 13]C NMR : it is composed of imines bases. In the hardened MUF resin, the presence of new amino-dimethy!ene bridges has been proved also by [exponent 13]C NMR. With this hardener, the V100 was easily passed (wet perpendicular tensile strength of particleboards > 0.15 MPa), which indicates that these particleboards. are capable of an exterior use. These MUF resins of E1 class are water-resistant just like phenol-formaldehyde resins, but most importantly, unlike the phenol-formaldehyde resins, they are not toxic and pollutant. If this hardener is used in industries, the situation of PF and MUF in markets will probably be changed in next few decades. About UF resins, addition of pure melamine monoacetate has been proved to be more efficient than addition of melamine for both dry and wet mechanical tests of traction. A more fundamental work has also been dobe to create a new UF resin containing as many urons species as possible, and two kind of uron resins with improved mechanical performances have been done.
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http://docnum.univ-lorraine.fr/prive/SCD_T_2000_0172_KAMOUN.pdf
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Submitted on : Thursday, March 29, 2018 - 10:39:23 AM
Last modification on : Friday, December 18, 2020 - 2:16:01 PM

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  • HAL Id : tel-01746510, version 1

Citation

Cyrille Kamoun. Mise au point de nouveaux adhésifs aminoplastiques pour panneaux de particules. Autre. Université Henri Poincaré - Nancy 1, 2000. Français. ⟨NNT : 2000NAN10172⟩. ⟨tel-01746510⟩

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