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1、10期何绪生等:一种新型保水缓释氮肥有关特征及性能2055一种新型保水缓释氮肥有关特征及性能何绪生1,2,3P,廖宗文1P,黄培钊2,P段继贤2,葛仁山2P,李洪波2,耿增超3P(1华南农业大学植物保护学博士后流动站,广州510642;2深圳市芭田生态工程公司企业博士后工作站,深圳518105;3西北农林科技大学资源与环境学院,杨凌712100)摘要:【目的】采用物理、化学方法研究一种以化学聚合反应共聚合成的新型保水缓释氮肥的特征和性能。【方法】采用红外光谱分析、电镜观察、差示扫描量热分析和热重分析等方法观察、解析及测定肥料有关特征
2、和性能。【结果】保水缓释氮肥吸水倍率可达103g×gP-1,含氮量达30%,酸碱度接近中性,是盐度指数极低的肥料。保水缓释氮肥的原料氮肥与保水材料之间通过氢键作用形成了共聚体,具有亲水基团,这是形成吸水保水的化学机制。保水缓释氮肥是一种吸水膨胀而不溶解的凝胶,是整体不均质而局部较均质的物质,在微观上具有网状结构,这是其吸水保水的物理结构。保水缓释氮肥所吸持的水分主要以有效性很高的自由水和束缚水存在,占其总持水量的95%,而有效性差的结合水含量低于5%。7d水溶出率养分占总养分的77%,具有延缓养分释放功能。【结论】保水缓释氮肥是具有
3、养分缓释和保水功能的新型保水缓释氮肥。关键词:保水缓释氮肥;特征;性能CharacteristicsandPerformanceofANewWater-AbsorbentSlowReleaseNitrogenFertilizerHEXu-shengP1,2,3,LIAOZong-wen1,HUANGPei-zhao2,DUANJi-xianP2,GERen-shan2,LIHong-bo2,GENGZeng-chao3(1PostdoctorateExchangeCentreforPlantProtection,SouthChina
4、AgricultureUniversity,Guangzhou510642;2EnterprisePostdoctorateCentreforBaTianEco-EngineeringCO.LtdinShenzhen,Shenzhen518105;3CollegeofResourcesandEnvironment,NorthwestSci-TechUniversityofAgricultureandForestry,Yangling712100)Abstract:【Objective】Aresearchwasconductedont
5、hecharacterizationandperformanceofwater-absorbentslowreleasenitrogenfertilizer(WASRNF),whichwaspreparedbychemicalpolymerization,physical,chemicalmethods.【Method】Investigation,interpretationandmeasurementweredonewithinfraredspectroscopy(IR),scanningelectronicmicroscopy(
6、SEM),differentialscanningcalorimetry(DSC)andthermogravimetryanalysis(TGA).【Result】ThewaterabsorbencyandnitrogenanalysisofWASRNFwas103g×gP-1and30%,respectively,andWASRNFexhibitedneutralinpHandhadverylowsaltindex.WASRNFwasacopolymerofnitrogenfertilizerandwater-absorbentm
7、aterialbyhydrogenbondassociation.Thereweremanyhydrophilicgroups,achemicalmechanismtoabsorbandretainwater.WASRNFswelledanddidnotdissolveinwater.WASRNFexhibitedwholeheterogenousandlocallyhomogenousnetworkstructuresfromtheviewpointofmicroscope.Thenetworkstructurephysicall
8、yabsorbedandretainedwater.ThewaterretainedinWASRNFexistedasafreeandafreezingwaterstate,accountingformorethan95%waterr