Graft copolymer of sodium carboxymethyl cellulose and polyether polyol (CMC-g-TMN-450) improves the crosslinking degree of polyurethane for coated fertilizers with enhanced controlled release characteristics

文献类型： 外文期刊

第一作者： Wang, Yang

作者： Wang, Yang;Liu, Hongxia;Liu, Jinlong;Sun, Mingxue;Qiao, Dan;Li, Juan;Wang, Yajing;Yang, Xiangdong;Liu, Weiyi;Bunt, Craig

作者机构：

关键词： Sodium carboxymethyl cellulose; Modified polyurethane; Superhydrophobic coating material; Controlled-release fertilizer; Release characteristics

期刊名称：CARBOHYDRATE POLYMERS （ 影响因子：9.381； 五年影响因子：8.678 ）

ISSN： 0144-8617

年卷期： 2021 年 272 卷

页码：

收录情况： SCI

摘要： Novel superhydrophobic sodium carboxymethyl cellulose (CMC) modified polyurethane (MPU) was developed as the membrane material for controlled-release fertilizer (CRF) by cross-linking polymerization of 4,4 '-diphenyl-methane diisocyanate (MDI) and CMC-based modified polyol (CMP) which was made by grafting CMC onto polyether polyol (TMN-450). The modified polyurethane coated fertilizer (MPUCF) was prepared by using MPU as the membrane material through a fluidized bed device. Analysis results of C-13 NMR showed that the coatings of PUCF and MPUCF were prepared by connecting hydroxyl to isocyanate groups to form a carbamate. MPU had lower water absorption rates than PU, and MPUCF coating showed excellent hydrophobicity. Scanning electron microscope (SEM) revealed that MPUCF coating surface was much more smooth and flat than that of PUCF. Furthermore, the nitrogen (N) release longevity of MPUCF can increased to 140 days when the coating rate was 5%. It is concluded that MPU was an excellent superhydrophobic coating material for CRF.

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