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›› 2008, Vol. 42 ›› Issue (2): 15-18.

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Preparation of Carboxylmethylcellulose Gel Beads and Their Performance on Slow Release of Fertilizer

LV Jin-hong, LI Jian-fa   

  1. Department of Chemistry, Shaoxing University, Shaoxing 312000, China
  • Received:2007-08-20 Revised:1900-01-01 Online:2008-03-30 Published:2008-03-30

Abstract: The preparation of carboxylmethylcellulose (CMC) gel beads was studied by using the water loss ratio to reflect the crosslinking progress. The results indicated that, the rate of water loss was quicker and the ratio of water loss higher following the increase of concentration of Fe3+ as the crosslinking agent. Following the increase of content of CMC in the solution for preparing gel beads, the ratio of water loss was lower. The water in CMC gel beads was mainly in a bonding status through analyzing the freezing process of gels with DSC method, and the longer the crosslinking time for preparing the gels, the lower the content of water in gels. The potassium nitrate was used as the model compound of fertilizer in release experiments. The results showed an apparently slow release when the loading amount of potassium nitrate in gel was 5.0%.

Key words: carboxylmethylcellulose, gel, fertilizer, release

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