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Starch and castor oil mutually modified, cross-linked polyurethane for improving the controlled release of urea.
- Source :
-
Carbohydrate Polymers . Jan2021, Vol. 251, pN.PAG-N.PAG. 1p. - Publication Year :
- 2021
-
Abstract
- • The bio-based polymer film was prepared using starch-based polyol and castor oil. • The starch-based polyol generated micropores in the film, regulated early N release. • Mutual modification regulated nutrient release more accurately. • The bio-based coating material was degradable and has no toxic effect to seeds. Due to the poor controlled release ability, bio-based materials are difficult for large scale application on controlled release fertilizers (CRFs). Starch-based polyol (SP) and castor oil (CO) were mutually modified, and a cross-linked polymer film was formed on the surface of urea by in-situ reaction, which improved the slow release ability of the bio-based material. The results showed that increasing the CO ratio reduced porosity of coating and prolonged the nitrogen (N) release period, while the SP changed the high-temperature wrinkle characteristics and regulated the early N release rate. The mutual modification achieved an ultra-long release period of bio-based CRUs for 7 months. The degradation rate during nine months of bio-based coatings (5.05 %) was significantly higher than that of petroleum-based (3.74 %), and the coating was non-toxic to rice seeds. Mutual modification provided a safe and effective solution for the preparation of bio-based CRFs with long-term controlled release capability. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 01448617
- Volume :
- 251
- Database :
- Academic Search Index
- Journal :
- Carbohydrate Polymers
- Publication Type :
- Academic Journal
- Accession number :
- 146682184
- Full Text :
- https://doi.org/10.1016/j.carbpol.2020.117060