双层和夹层包膜工艺对水基树脂包膜材料控释性能的影响

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1、双层和夹层包膜工艺对水基树脂包膜材料控释性能的影响研究论文双层和夹层包膜工艺对水基树脂包膜材料控释性能的影响**喻建刚，刘芳，樊小林，张立丹，廖照源(华南农业大学资环学院肥料与平衡施肥研究室，广东广州510642)摘要：为了充分发挥水基树脂的包膜控释性能，本文以3-4mm的尿素为核心、脂溶性树脂为配合材料，利用流化床制造多层包膜控释尿素，采用静水溶出法测定包膜控释尿素的养分释放特征，并评价双层和夹层包膜工艺对水基树脂包膜材料控释性能的影响。研究结果表明：两种工艺相比，夹层包膜工艺能显著延长包膜控释尿素的肥效期，其肥效期是双层包膜工艺的5倍以上。在夹层包膜工艺下，隔离层的厚

2、度不影响-2-2-2-2包膜控释尿素的肥效期，隔离层厚度分别为5g·m、10g·m和15g·m时，用50g·m水基树脂包膜材料做控-2释层和10g·m脂溶性树脂做保护层制造的控释尿素之肥效期相同。但是，增加隔离层厚度却明显改变了夹-2层包膜控释尿素的养分释放模式，隔离层厚度达到10g·m以上时，养分释放模式由抛物线型变成了S型。可见采用夹层包膜工艺能使水基树脂发挥其更好的控释性能，并实现养分的S型释放。关键词：控释尿素；水基树脂；双层工艺；夹层工艺；肥效期中图分类号:S143.15；TQ574.4文献标识码:AEffectofDoubleorTripleCoatingTe

3、chnologyonControlledReleasePropertiesofWaterMediumResinasCoatingMaterialYUJiangang，LIUFang，FANXiaolin*ZHANGLidanLIAOZhaoyuan(FertilizerScienceandBalancedFertilizationResearchLaboratory,CollegeofNatureResourceAndEnvironmentScience,SouthChinaAgricultureUniversity,Guangzhou510642,China)Abstr

4、act:Inordertoinducethemaximumcontrolledreleasepropertiesofwatermediumresinascoatingmaterial(WMRM),ureawithadiameterof3to4mmassubstrateandsolventbasedresinasadditivematerial(SBRM),beingbothisolationlayerandprotectionone,wereusedtoproducemulti-layerPCUs(polymercoatedureas)byuseoffluid-bed.S

5、taticwaterincubationmethodwasappliedtotestnutrientreleasecharacteristicsofthePCUs.Theresultswereusedtoevaluatetheeffectofcoatingtechnology,beingdoubleandtriplecoatingtechniques,oncontrolledreleasepropertiesofWMRM.Resultsshowedthatthetriplecoatingtechniquehelpgreatlythelongevityofcontrolle

6、dPCUsandtheirslongevitywerefivetimesofthatofPCUsproducedbydoublecoatingtechnology.Byuseofthetriplecoatingtechnology,thethicknessofisolationlayerhadnoinfluenceonlongevityofcontrolledreleasepropertiesofPCUs.Longevitiesamongcontrolled-2-2PCUswhichweremadebyuseof50g·mWMRMascontrolledreleasela

7、yerand10g·mSBRM-2-2-2asprotectionlayeraswellas5g·m,10g·mand15g·mSBRMasisolationlayerseparatelywerenosignificantdifference.HowevernutrientreleasepatternsofthePCUschangedremarkablywithincreasingisolationlayerthicknesswhenthetriplecoatingtechnologywasapplied.Thenutrien