Conclusions
Coagulation of skim natural latex by dilute sulfuric acid and ammonium polyacrylate solution (NHPA)
could improve quality of the skim rubber in terms of Mooney viscosity, dirt content, ash content, nitrogen content.
Also, lower BOD of waste water was observed. Therefore, this method provides higher quality of the skim rubber and
waste water.
Acknowledgments
We are grateful to the Center of Excellence in Natural Rubber Technology (CoE-NR) and the Thailand
Research Fund (TRF) for the Medium Project on Rubber (MPR) contract No. RDG5250066 for financial support.
References
Bunrasri, S. (1999). Solving uncoagulation problem for skim latex from concentrate latex, Master Thesis, Faculty of
Science & Technology, Prince of Songkla University, Pattani.
Dokkhan, Ch. (2008). A study of skim natural rubber properties from creaming process using cellulose ethers, Master
Thesis, Faculty of Science & Technology, Prince of Songkla University, Songkla.
Nitayapat, J., Loykulnant, S., Varanusupakul, P. (2008). The quality of waste water from creaming process of skim
natural rubber latex using hydroxypropyl methyl cellulose. KMITL. Sci. J. 8(2).
Werathirachot, R., Danwanichakul, P., Kongkaew Ch, Loykulnant S.(2008). Water sokuble chitosan as an
environment friendly coagulant in removal of rubber particles from skim rubber latex.
Materials and
Minerals
. 18(2), 93-97.
Phupewkeaw, N. (2009). Development and improvement of low-protein skim rubber properties for pressure-sensitive
adhesive application, Master Thesis, Faculty of Science & Technology, Prince of Songkla University,
Songkla.
