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Research on Technologie and Mechanism of Degradation of Epoxy Resin with Hydrothermal Method

Author: LiLi
Tutor: LiuYuYan
School: Harbin Institute of Technology
Course: Polymer Chemistry and Physics
Keywords: epoxy resin solvosis chemical decomposition
CLC: TQ323.5
Type: Master's thesis
Year: 2009
Downloads: 76
Quote: 0
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Abstract


Owing to its special properties, epoxy resin is widely used in many areas. However, as one kind of crosslinking thermosetting resin, epoxy resin can neither be melted nor be dissolved in any common solvent, or even be degraded by microorganism so that it is a tough problem to deal with the discarded materials after used.In this paper, a kind of chemical method with water as the liquid reaction medium to decompose epoxy resin was studied. The thermosetting epoxy resin was decomposed successfully. The effects of reaction time, decomposition temperature, pressure, feedstock and particle size on the thermosetting epoxy resin E-44/IPDA (isophorone diamine) and E-44/MeTHPA(methyl tetrahydro phthalic anhydride)+BDMA(4,4’-Methylenebis N,N-dimethylaniline) were investigated with pure water as solvent. Different kinds of catalysts were used in the series of experiments. Added to the system respectively, aqueous sodium hydroxide solution, ammonium chloride,hydrogen peroxide solution were found having an obvious influence on the rise of decomposition rate, while metals and sodium carbonate had opposite effects. Simultaneously different curing systems, namely E-44/MeTHPA and E-44/TETA (Triethylenetetramine), were chosen to study the differences of decomposition rate. The whole reaction is divided into two steps: mass transfer from the bulk fluid to the surface and vice versa and the degradation reaction, involving the surface reaction and the inner degradation.The decomposition reaction products were characterized by Infra-red spectra (IR), Atomic Force Microscope (AFM), Gas Chromatography-Mass Spectrometry (GC-MS). With the combined function of characterization and the differences of decomposition rate between various curing systems, the mechanism of solvosis was envisaged. The bond cracking method for these four reaction system are as follows: ether bond cracking of E-44/TETA and E-44/IPDA with amine bond cracking as assistant method to speed up the whole reaction in a degree; ester bond of curing and mixed ether in the main chain cracking of E-44/MeTHPA+BDMA; ether and ester bonds for curing and mixed ether cracking of E-44/MeTHPA.

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CLC: > Industrial Technology > Chemical Industry > Synthetic resins and plastics industry > Polycondensation resin and plastic > Epoxy resins and plastics
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