Staff Members - Benha University
Improvement of White Pinewood Properties by Impregnation with Thiourea–Formaldehyde Resin and Orthophosphoric Acid
J Appl Polym Sci • 2000
Publication Information
Authors
A. A. MAHMOUD, A. M. F. EISSA, M. S. OMAR, A. A. EL-SAWY, A. F. SHAABAN
Keywords
Not Available
Journal
J Appl Polym Sci
Publisher
© 2000 John Wiley & Sons, Inc.
Volume
77
Issue
Not Available
Pages
390–397
publication.type
International
Paper Link
Not Available
Supplementary Materials
Not Available
Abstract
White pinewood was impregnated with thiourea–formaldehyde (TUF) resin
and orthophosphoric acid (OPA) as a crosslinking agent. The best weight gains (55–
138%) were obtained after impregnation with an aqueous solution of TUF resin for 1 h
and impregnation with aqueous solutions of OPA at different concentrations for 1 h.
Water uptake of treated wood was found to be 23% after a water-soaking test of 168 h,
and a maximum antiswell efficiency was found to be 18% for a 85% OPA solution.
Compression strength of the treated wood also improved with the highest value 62
KN/m2 for wood treated with a 70% OPA solution versus a value of 40 KN/m2 for
untreated samples. Fire retardancy of the treated wood samples was also improved based on concentration of OPA.
and orthophosphoric acid (OPA) as a crosslinking agent. The best weight gains (55–
138%) were obtained after impregnation with an aqueous solution of TUF resin for 1 h
and impregnation with aqueous solutions of OPA at different concentrations for 1 h.
Water uptake of treated wood was found to be 23% after a water-soaking test of 168 h,
and a maximum antiswell efficiency was found to be 18% for a 85% OPA solution.
Compression strength of the treated wood also improved with the highest value 62
KN/m2 for wood treated with a 70% OPA solution versus a value of 40 KN/m2 for
untreated samples. Fire retardancy of the treated wood samples was also improved based on concentration of OPA.