Biodegraded and polyurethane drape-formed urea fertilizer

Abstract

Natural water absorbent konjac flour participates in synthesizing biodegraded and polyurethane foamed drape, which is used to release urea slowly. The experimental results indicate that the slowly-releasing velocity of urea nitrogen and the degrading velocity of the drape can be controlled by regulating the thicknesses of drapes, the amount of konjac flour and the water content. In addition, the biodegradability of the drape was investigated by burying the specimens in earth afterwards, and results show this drape can be degraded naturally.

Keywords

polyurethane foam / konjac flour / slowly-releasing / urea / biodegradation

References

[1] Yu J Y, Bai S P, Kang S F. Development of Slowly-releasing Fertilizer (1). J. Fertilizer Industry, 1996, 26(5): 15-19.

[2] Yu J Y, Bai S P, Kang S F. Development of Slowly-releasing Fertilizer (2). J. Fertilizer Industry, 1996, 26(6): 3-8.

[3] Gong Z Y. Development of long-effect Nitrogen Fertilizer. J. Fertilizer Industry, 1992, 5: 3-5.

[4] Liao S. Research on the Mechanism and Effect of Draped Releasing Fertilizer. J. Xibei University of Farming and Forest, 2001, 29(6): 14-17.

[5] Zhang Z M. Developments of GNFC Phosphorus Plaster and Draped Urea. J. Fertilizer Industry, 1990, 1: 31-36.

[6] Gao J W. Formaldehyde Draped Urea. J. Fertilizer Industry, 1990, 3: 43-47.

[7] Zhang T Z. Polythene Draped Urea. J. Fertilizer Industry, 1990, 2: 38-41.

[8] Xu X C. Subject Reports of Draped Releasing Fertilizer (one). J. Phosphorus and Compound Fertilizer, 2000, 15(3): 1-6.

[9] Sun X Y. Application Effect of Long-effect Carbon Amine and Urea. J. Fertilizer Industry, 1992, 1: 22-26.

[10] Cui Y D. Manufacture and Application of Compound Fertilizer. J. Earth Research., 2002, 33(2): 131-132.

[11] Mei Q L, Yan S L, Shen D R, . Study on the Modification of Phenolic Foam Material. J. Journal of Wuhan University of Technology, 2002, 6: 22-24.

[12] Yu Q G. Research on the Effect of Slowly-releasing Fertilizer on Camellia. J. Earth Research., 2002, 33(2): 131-132.

[13] Nishinari K. Review of the Physical-chemical Characteristics and Properties of Konjac Mannal. Food Hydrocolloids, 1992, 6(2): 199-222.

[14] Shanghai Leather and Plastic Company Producing Process of Polyurethane Foam, 1976 Beijing: Beijing Light Industry Press. 17-57.

[15] Fang Y S, Zhu L M. Polyurethane Foamed Plastic, 1994 Beijing: Chemical Industry Press. 19-25.