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Laminating resol varnishes made with crude multivalent phenol
Author(s) -
Sridhar S.,
Gadlinge Pavitra,
Ratra M. C.
Publication year - 1993
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1993.070470506
Subject(s) - phenol , distillation , varnish , phenols , carbonization , materials science , yield (engineering) , organic chemistry , chemical engineering , chemistry , composite material , scanning electron microscope , engineering , coating
During the carbonization process of a lignite source available in the southern part of India, a very cheap byproduct, crude multivalent phenol, was obtained. This crude consisting of substituted phenols and carbonaceous pitch was distilled to get a pitchfree distillate of about 60% yield. The distillate mixture was used along with other phenols for synthesis of resol varnish using a base catalyst. The properties of the resols were evaluated and found to be similar to that of pure phenol (C 6 H 5 OH) resins. The resol varnishes prepared were used for making cotton paper phenolic laminates by hand impregnation and the compression‐molding technique. The paper laminates have been evaluated for physical, chemical, mechanical, and electrical properties. The experimental investigations indicate that the distillate of multivalent phenol is a useful inexpensive substitute for conventionally used phenols in the manufacture of P 3 grade laminates. © 1993 John Wiley & Sons, Inc.