Author/Authors :
SHEIKH, ANSAR MEHMOOD Material Science Research Centre - PCSIR Laboratories Complex, Pakistan , KHOKHAR, IRSHAD University of the Punjab - Institute of Chemistry, Pakistan , ANWAR, MUHAMMAD SHAFIQUE Material Science Research Centre - PCSIR Laboratories Complex, Pakistan , KHAN, MUHAMMAD NAEEM Applied Chemistry Research Centre - PCSIR Laboratories Complex, Pakistan , AKHTAR, HIFZA Applied Chemistry Research Centre - PCSIR Laboratories Complex, Pakistan
Abstract :
A low cost synthesis of urea formaldehyde adhesive from local raw materials was developed. Urea (100g) was dissolved in 37 % formalin (150ml) and transferred to flask. With NaOH solution, the pH was adjusted to 8.5 and refluxed for two hours on water bath until required viscosity was obtained. The viscosity (180-280cps), solid contents (45-63 %), density (1.80-2.25g/ ml), pH (7.0-8.5) and shelf life (4-115 days) were measured to judge the level of quality. The parameters: viscosity, density, solid contents, appearance and pH were found to be compatible with the standard values. Moderate pot-life and tensile strength on application to wood were found to be encouraging
