Improvement of white pinewood properties by impregnation with thiourea–formaldehyde resin and orthophosphoric acid
✍ Scribed by A. A. Mahmoud; A. M. F. Eissa; M. S. Omar; A. A. El-Sawy; A. F. Shaaban
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 153 KB
- Volume
- 77
- Category
- Article
- ISSN
- 0021-8995
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✦ Synopsis
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/m 2 for wood treated with a 70% OPA solution versus a value of 40 KN/m 2 for untreated samples. Fire retardancy of the treated wood samples was also improved based on concentration of OPA.