Kinetika Reaksi Gliserolisis Sirlak

Danang Tri Hartanto, Rochmadi Rochamdi, Budhijanto Budhijanto

Abstract


Shellac is one of natural polymers that can be utilized for polyesters, paint, coating, matrix, etc. However, one of its weakness is stiff and brittle. This research aimed at investigation of shellac modification with glycerol in the absence of catalyst. The reaction kinetics model observed the effect of hydroxyl position in the glycerol. Reaction was run in the three-neckedflask assembled with electic stirrer and condenser. In the present work, the variables investigated were reaction temperatures (1600C, 1700C, 1800C, and 2000C) in the atmospheric pressure. During 2 hours of reaction process, every 15 minutes and 30 minutes reaction product was sampled to analyze the remaining free glycerol by periodic acid method. Experimental result showed that reaction of shellac and glycerol could be undertaken in the range of temperature 1600C - 1800C, and the maximum temperature is 2000C, because in this temperature shellac begin to decompose. The result showed that reaction kinetics model can describe reaction between shellac and glycerol.


Keywords


ester, glycerol, glycerolysis, reaction kinetics, shellac

References


Byun Y., Ward A., Whiteside S. Formation and characterization of shellac-hydroxypropyl methylcellulose composite films. Food Hydrocolloids. 2012; 27 (2): 364–370.

Chiplunkar P. P., Pratap A. P. Utilization of sunflower acid oil for synthesis of alkyd resin. Progress in Organic Coatings. 2016; 93: 61–67.

Kementrian Dalam Negeri. 2013. http://keuda.kemendagri.go.id/artikel/detail/22-membangun-daya-saing-daerah (diakses 30 April 2018)

Heriyanto H., Rochmadi, Budiman A. 2011, Kinetika reaksi alkyd resin termodifikasi minyak jagung dengan asam phtalat anhidrat. Jurnal Rekayasa Proses. 2011; 5 (1): 1–9.

Sharma S. K., Shukla S. K., Vaid D. N. Shellac-structure, characteristics & modification. Def Science Journal. 1983; 33 (3): 261–271.

Soradech S., Nunthanid J., Limatvapirat S., Luangtana-anan M. An approach for the enhancement of the mechanical properties and film coating efficiency of shellac by the formation of composite films based on shellac and gelatin. Journal of Food Engineering. 2012; 108 (1): 94–102.

Soradech S., Limatvapirat S., Luangtana-anan M. Stability enhancement of shellac by formation of composite film: effect of gelatin dan plasticizers. Journal of Food Engineering. 2013; 116 (2): 572–580.

Uzoh C. F., Onukwuli O. D., Odera R. S., Ofochebe S. Optimization of polyesterification process for production of palm oil modified alkyd resin using response surface methodology. Journal of Environmental Chemical Engineering. 2013; 1 (4): 777–785.

Wang J., Chen L., He Y. Preparation of environmental friendly coatings based on natural shellac modified by diamine dan its applications for copper protection. Progress in Organic Coatings. 2008; 62 (3): 307–312.


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