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Pyolysis Characteristics and Kinetics of Printed Circuit Boards Made with Anti-BR Type Epoxy Resin

Author: LiuYuQing
Tutor: HaiReTi
School: Beijing University of Chemical Technology
Course: Environmental Science and Engineering
Keywords: Epoxy resin Board Pyrolysis Dynamics
CLC: X76
Type: Master's thesis
Year: 2011
Downloads: 37
Quote: 1
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Abstract


With the rapid development of the electrical and electronic industry, the replacement frequency of the electrical and electronic products is accelerating, the rapid increase in the number of electronic waste. Circuit board as the core component of the electrical and electronic products, has become an important source of e-waste. The the EU WEEE.RoHS.EuP three green implementation of the directive, as well as our \Therefore, exploring waste no bromine epoxy circuit board resource utilization of technology has important significance. The recycling technology integrated industrial chain link technology research support, research board pyrolysis recycling technology in a sub-project of the National Science and Technology Support Program \Board of pyrolysis recycling technology as a single technology and metal recovery technology nonmetal recycled board technology integration, integrated technology mode, as the recycling of waste printed circuit boards can be a good resource recycling board . This paper focuses on the bromine-free epoxy circuit board thermal solutions influencing factors, pyrolysis product composition, pyrolysis kinetics of the three aspects of the content. First, studies of the pyrolysis temperature (300 ° C -900 ° C) under a nitrogen atmosphere, heating rate (10 ℃ / min-40 ℃ / min). Holding time (30 min-60min), the bromine-free epoxy resin circuit board pyrolysis product yield impact. The results show that: between 300 ℃ -900 ℃ pyrolysis products pyrolysis residue accounted for 61.74% -71.08% the pyrolysis oil accounted for 22.52% -28.44% 5.86% -12.81% pyrolysis gas accounted. In the pyrolysis temperature of 700 ° C, the heating rate of 20 ° C / min, holding time 40min pyrolysis oil yield. Secondly, respectively, by IR, GC-MS (GC / MS) analysis of the changes in the functional groups and the pyrolysis oil ingredients. Respectively, the application of infrared spectroscopy, elemental analysis and scanning electron microscopy (SEM) analysis of the functional group of the pyrolysis residue, elemental composition and the microscopic appearance with the changes in the pyrolysis temperature. The results show that: the main component of the pyrolysis oil as phenol, 2 - p-cresol, 2,6 - diisopropyl phenol and bisphenol A, etc.. Glass fiber appearance in the pyrolysis process unchanged. Finally, using thermal gravimetric analysis carried out the kinetics of the pyrolysis reaction of the bromine-free epoxy resin circuit board under the condition of argon gas (Ar), and study the pyrolysis process of the bromine-free epoxy resin circuit boards. Analysis by TG and DTG curves of thermal stability under different heating rates and heating rate on the pyrolysis reaction. Kissinger differential method and Flynn-Wall-Ozawa integral method to study the activation energy E related kinetic parameters; Coats-Redfern method of obtaining the kinetic equation of the closest the Valensi equation, deduced that the reaction order n = 2 No thermal decomposition mechanism of function of the O-type epoxy circuit board and α (1-α) · 1n (1-α).

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > Machinery, instruments and industrial waste treatment and comprehensive utilization
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