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Development and Characterization of Phenol - Formaldehyde Molding Powder

Author(s): M .O. Edoga | A.S. Kovo

Journal: Leonardo Electronic Journal of Practices and Technologies
ISSN 1583-1078

Volume: 5;
Issue: 8;
Start page: 41;
Date: 2006;
Original page

Keywords: Phenol-formaldehyde | pH | Molding powder | Novolac | Infrared spectroscopy

The synthesis of phenol-formaldehyde resin was carried out at pH 4.0-4.3, formaldehyde to phenol (F/P) of 0.881 in the presence of acid catalyst (hydrochloric acid and oxalic acid), at operating temperature and pressure of 115°C and 1 atmospheric pressure respectively. Forty-six grams of the resin produced was formulated into molding powder by incorporating the following: 44.6 grams of water-free- wood-floor, 6.7 g of hexamethylene-tetramine, 2.0 g of magnesium oxide and 1.0 g of magnesium stearate. The determination of pH, viscosity, specific gravity, refractive index, molecular weight and total solid content were carried out at 25°C for both the neat/ conventional P-F resin and the molding powder, while infrared spectrum was performed only on the neat P-F resin. The result obtained showed the sample with water-free-floor (sample y) has better mechanochemical properties than the neat sample (simple x). The results for both sample X and Y are: pH valve of 4.11 and 4.5, viscosity of 173.72 and 243.12 poise, refractive index for sample X was 1.67, molecular weight 16967.63 and 25234.54 respectively. The analysis of infrared spectroscopy of sample X showed that at region 3650-3590 cm-1, ­­­there was an absorption whose peak was between sharp and weak and is also O-H stretch-free indicating presence of phenol. The intensity of absorption at region 2800-2700cm-1 is medium indicating C-H stretching vibration of -CHO presence confirming aldelydes. Hence the physiochemical properties and the intra-red spectrum compared well with literature values.
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