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Synthesis and characterization of phenol‐urea‐formaldehyde foaming resin used to block air leakage in mining
Author(s) -
Hu Xiangming,
Zhao Yanyun,
Cheng Weimin,
Wang Deming,
Nie Wen
Publication year - 2014
Publication title -
polymer composites
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.577
H-Index - 82
eISSN - 1548-0569
pISSN - 0272-8397
DOI - 10.1002/pc.22867
Subject(s) - paraformaldehyde , formaldehyde , phenol , materials science , urea , catalysis , epichlorohydrin , copolymer , urea formaldehyde , nuclear chemistry , polymer chemistry , chemical engineering , composite material , chemistry , organic chemistry , polymer , adhesive , layer (electronics) , engineering
In this study, phenol, urea, and paraformaldehyde were used as the monomers for the one‐step synthesis of phenol‐urea‐formaldehyde (PUF) foaming resin that was used to block air leakage in mining. An orthogonal test was used to study the effects of urea amount, catalyst amount, reaction temperature, and reaction time on the foaming property of the resin. The results showed that the optimum parameters for synthesizing PUF resin are as follows: 1 mol phenol, 0.5 mol urea, 3 mol formaldehyde equivalents of paraformaldehyde, and 0.05 mol catalyst at 75°C for 3 h. The infrared and 13 C nuclear magnetic resonance spectra of the PUF resin showed that the chemical structure of the PUF resin was significantly different from that of phenol‐formaldehyde resin, indicating that a copolymerization reaction has occurred among the three components, that is, phenol, urea, and paraformaldehyde. In this study, PUF foam was prepared from catalysts and PUF resin. The results showed that the foaming capacity and oxygen index of the PUF foam were significantly improved by using urea, whereas the shrinking percentage decreased with no change in compression strength. POLYM. COMPOS., 35:2056–2066, 2014. © 2014 Society of Plastics Engineers