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Solvolyse de déchets de composites époxyde-verre

Abstract : The glycolysis of epoxy resins cured by anhydrides is rallier easy. The tetrabutylorthotitanate showed to be an effective catalyst. The depolymerisation is practically pushed np to the monomer’s stage and the glycolysis product is constituted by esterdiols, tetrols and e.xcess of glycol. The excess of solvent can be eliminated by distillation itnder vaccttm, witliout reactions of reequilibration towards the formation of liiglier molar mass species. The glycolysis of composite materials also occurs ejfectively. Fibreglasses are released after disagregation of the matrix. By treating tall samples, we can get long fibers after a solid-liquid séparation. After washing and drying, the rate of organic contamination is lower than 0,05%. Althougli, epoxy resins cured by aminés do not contain ester junctions, the glycolysis still leads to a depolymerisation, and this one is easier when the hardener is an alipltatic aminé. Following the same experimental protocole, the glycolysis of DGEBA matrix’s composite cured by an aromatic aminé leads to the released of fibers, but still polluted by organic residues. First attemps, by changing the catalyst and/or the solvent, show a high réduction of fibers organic pollution.
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Submitted on : Tuesday, January 12, 2016 - 1:58:10 PM
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K. El Gersifi, Geoffroy Durand, Gilles Tersac. Solvolyse de déchets de composites époxyde-verre. Matériaux & Techniques, EDP Sciences, 2002, 90 (1-2), pp.37-59. ⟨10.1051/mattech/200290010037⟩. ⟨hal-01254548⟩



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