植物营养与肥料学报2023，Vol.29Issue(11)：2132-2142,11.DOI:10.11674/zwyf.2023168
筛选温敏聚氨酯包膜肥料膜材以提升养分智能控释效果
Screening of temperature-sensitive polyurethane materials to enhance the nutrient intelligent release of controlled-release fertilizers
摘要
Abstract
[Objectives]Temperature is one of the important factors affecting crop growth and nutrient release rate of fertilizer.The nutrient release of temperature-sensitive controlled-release fertilizers could match with the crop nutrient uptake more efficiently.So we screened the temperature-sensitive compounds and studied their coating properties primarily.[Methods]In this study,18 different polyols,namely hexanedioicacid-1,4-butanediol(PBA),polytetramethylene ether diol(PTMG),polycaprolactone diol(PCL)and polyethylene glycol(PEG)with varying molecular weights,were subjected to a one-step reaction with diphenylmethane diisocyanate(MDI)to prepare polyurethane(PU)films.Differential scanning calorimetry(DSC)was employed to assess the phase transition temperature of the films.A thermo-sensitive compound was chosen to prepare TSPU encapsulated urea,and the nutrient release period was tested.[Results]The release performance of CRU prepared from different polyols descended in order of PTMG＞PCL＞PBA＞PEG.For the same series of CRUs,the controlled-release performance decreased with the increase in the molecular weight of the polyols.DSC testing results indicated that PU films prepared from low molecular weight polyols(below 2000)did not exhibit thermo-sensitivity,but did in the high molecular weight polyols.The critical transition temperatures for PTMG2000,PTMG3000,PCL2000,PBA2000,and PCL3000 were 13℃,22℃,27℃,39℃,and 43℃,respectively.PCL2000 and PCL3000 were selected as thermo-sensitive materials,and mixed with polypropylene glycol(PPG)in molar ratio of 2:8 to prepare two TSPU-coated urea fertilizers(PUCF1 and PUCF2).Both PUCF1 and PUCF2 showed temperature-dependent nutrient release rates,with daily release rate of 11.1％and 7.1％at 35℃,which was 13.2 and 6.0 times of that at 25℃.The nutrient release period of PUCF1 and PUCF2 was as long as 30 days at 25℃.[Conclusions]Polyols with high molecular weight exhibit thermos-sensitivity.Modification of them with diphenylmethane diisocyanate could improve the controlled release properties of the films made of the high molecular polyols.Under the experimental condition,the coated urea showed a certain thermo-sensitive characteristics and a controlled release period of up to 30 days.More researches are needed to design temperature-responsive controlled-release fertilizers.关键词
温敏聚氨酯/温度响应性控释肥料/分子量/多元醇/控释特性Key words
thermo-sensitive polyurethane/temperature-responsive controlled release fertilizer/molecular weight/polyol/controlled release characteristics引用本文复制引用
李娟,乔丹,王亚静,林茹,顾典润,周源芳,李涵,杨相东..筛选温敏聚氨酯包膜肥料膜材以提升养分智能控释效果[J].植物营养与肥料学报,2023,29(11):2132-2142,11.基金项目
国家重点研发计划(2022YFD1700605) （2022YFD1700605）
国家自然科学基金项目(32372819) （32372819）
中国农业科学院科技创新工程. （）
