A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Phosphogypsum utilization. Part III: as adhesive filler and composite materials
The aim of this work is to make use of PG (phosphogypsum) waste material, which is produced in phosphoric acid and phosphate fertilizer manufactures. A number of wood adhesive formulations based on PVAc (polyvinyl acetate) polymer and phosphogypsum as a filler have been prepared, using different percentages of phosphogypsum, ranging between 5 to about 20 wt pct. The prepared formulations were tested for adhesion strength and compared with both natural and pure gypsum fillers. The results indicate that PG improves the adhesion strength when 5 wt pct added, and that may be due to filling the porous surface of wood with the fine particles of PG, as weIl as coating the particles of the filler (PG) with PVAc units. Also, a number of formulations based on urea-formaldehyde polymer have been prepared using phosphogypsum as an active filler in the ratio of 40 to about 75 wt pct to prepare composite materials used for some decoration purposes and construction. Mechanical, physical, and thermal properties of these formulations were studied. Also, the activation energy was calculated. The results indicate that PG without acid hardener can be used for preparation of composite materials based on urea-formaldehyde between 40 to about 63.64 wt pct for construction purposes in the humid atmosphere, while between 63.64 to about 75 wt pct for decoration purposes. The improvement of the physical, mechanical and thermal properties of the composite material may be attributed to the simultaneous hydration hardening action of phosphogypsum and the presence of 0.8% P2O5. These effects act as an active hardener for urea-formaldehyde resin and accelerate the cross-linking and network formation reinforced by the fine dusty inorganic particles of PG. The advantage of this method is to prepare composite material gypsum-urea-formaldehyde, which achieves the utilization of large amount of PG, reducing the price of the main product phosphate, minimizing the pollution and producing new materials which possess high thermal resistance, good mechanical properties and water resistance that are suitable for construction panels.
Phosphogypsum utilization. Part III: as adhesive filler and composite materials
The aim of this work is to make use of PG (phosphogypsum) waste material, which is produced in phosphoric acid and phosphate fertilizer manufactures. A number of wood adhesive formulations based on PVAc (polyvinyl acetate) polymer and phosphogypsum as a filler have been prepared, using different percentages of phosphogypsum, ranging between 5 to about 20 wt pct. The prepared formulations were tested for adhesion strength and compared with both natural and pure gypsum fillers. The results indicate that PG improves the adhesion strength when 5 wt pct added, and that may be due to filling the porous surface of wood with the fine particles of PG, as weIl as coating the particles of the filler (PG) with PVAc units. Also, a number of formulations based on urea-formaldehyde polymer have been prepared using phosphogypsum as an active filler in the ratio of 40 to about 75 wt pct to prepare composite materials used for some decoration purposes and construction. Mechanical, physical, and thermal properties of these formulations were studied. Also, the activation energy was calculated. The results indicate that PG without acid hardener can be used for preparation of composite materials based on urea-formaldehyde between 40 to about 63.64 wt pct for construction purposes in the humid atmosphere, while between 63.64 to about 75 wt pct for decoration purposes. The improvement of the physical, mechanical and thermal properties of the composite material may be attributed to the simultaneous hydration hardening action of phosphogypsum and the presence of 0.8% P2O5. These effects act as an active hardener for urea-formaldehyde resin and accelerate the cross-linking and network formation reinforced by the fine dusty inorganic particles of PG. The advantage of this method is to prepare composite material gypsum-urea-formaldehyde, which achieves the utilization of large amount of PG, reducing the price of the main product phosphate, minimizing the pollution and producing new materials which possess high thermal resistance, good mechanical properties and water resistance that are suitable for construction panels.
Phosphogypsum utilization. Part III: as adhesive filler and composite materials
Anwendung von phosphathaltigen Gips. Teil III: als Kleberfüllstoff und Verbundwerkstoff
Hanna, A.A. (author) / Abu-Ayana, Y.M. (author) / Ahmed, S.M. (author)
Journal of Materials Science and Technology ; 16 ; 439-444
2000
6 Seiten, 4 Bilder, 7 Tabellen, 17 Quellen
Article (Journal)
English
Gips , Phosphorzusatz , Phosphorsäureanhydrid , Abfallstoff , Wiederaufbereitung , Wiederverwendbarkeit , industrielle Anwendung , Anwendungsbeispiele , Füllstoff , Klebstoff , Verbundwerkstoff , verstärkter Kunststoff , Polyvinylacetat , Harnstoffformaldehydharz , Holzschutzmittel , Fertigungsverfahren , Verfahrensbedingung , Vergleichstest , mechanische Eigenschaft , Scherfestigkeit , Druckfestigkeit , Zugfestigkeit , Härte , Wärmebeständigkeit , Thermogravimetrie , mathematische Formel , Aktivierungsenergie , Gehalt (Zusammensetzung) , Fremdstoffanteil
Phosphogypsum Utilization Part III: as Adhesive Filler and Composite Materials
| British Library Online Contents | 2000
| British Library Online Contents | 2002
| British Library Online Contents | 2002
Phosphogypsum Utilization Part II: Preparation of Ammonium Sulphate
| British Library Online Contents | 1999