Bio:
Email: 1638226422@qq.com
薛憬(2000—),男,硕士研究生,研究方向为包膜肥料的制备;1638226422@qq.com
针对相对分子质量较低的聚乳酸(LPLA)韧性差,在包膜肥料生产过程中容易出现空洞和裂缝,造成包膜肥料养分释放期缩短的问题,开展了在LPLA中添加质量分数为0、10%、20%、30%、40%的相对分子质量较高的聚乳酸(HPLA)制取共混膜(LPLA100、LPLA90、LPLA80、LPLA70、LPLA60)的试验,分别对理想成膜条件下得到的理想共混膜和在改进的Wurster流化床中制得的工艺共混膜包膜尿素进行表征。结果表明:添加HPLA后,理想共混膜的韧性增强,结晶度下降,水蒸气和氮元素渗透率增大;理想共混膜LPLA70包膜尿素的养分释放周期比理想共混膜LPLA90、LPLA80、LPLA60包膜尿素的长;在改进的Wurster流化床中制取的工艺共混膜LPLA70包膜尿素的养分释放周期最长,工艺完整度最高。在LPLA中添加30%的HPLA,可以提高共混膜的韧性,包膜肥料生产工艺对膜的影响最小。
In view of the poor toughness of low molecular weight polylactic acid (LPLA), which tends to form cavities and cracks during the production process of coated fertilizers, resulting in a shortened nutrient release period of coated fertilizers, experiments are conducted to prepare blended films (LPLA100, LPLA90, LPLA80, LPLA70, LPLA60) by adding high molecular weight polylactic acid (HPLA) with mass fractions of 0, 10%, 20%, 30%, and 40% to LPLA. The ideal blended films obtained under ideal film-forming conditions and the process blended films coated urea prepared in an improved Wurster fluidized bed are characterized, respectively. The results show that the addition of HPLA enhances the toughness of the ideal blended films, decreases the crystallinity, and increases the water vapor and nitrogen permeability. The nutrient release period of the ideal blended film LPLA70 coated urea is longer than that of the ideal blended films LPLA90, LPLA80, and LPLA60 coated urea. The process blended film LPLA70 coated urea prepared in the improved Wurster fluidized bed has the longest nutrient release period, and the highest coating integrity. Adding 30% HPLA to LPLA can improve the toughness of the blended films, and the production process of coated fertilizers has the minimal impact on the films.
PALAMANIT A, PRACHAYAWARAKORN S, TUNGTRAKUL P, et al. Performance evaluation of top-spray fluidized bed coating for healthy coated rice production[J]. Food and Bioprocess Technology, 2016, 9: 1317-1326. doi:10.1007/s11947-016-1720-3
SONG Y Q, ZHOU T, BAI R Q, et al. Assessment of the coating quality in a top-spray fluidized bed coater: an experimental study[J]. Powder Technology, 2024, 439: 119663. doi:10.1016/j.powtec.2024.119663
SEYEDIN S H, ZHALEHRAJABI E, ARDJMAND M, et al. Using response surface methodology to optimize the operating parameters in a top-spray fluidized bed coating system[J]. Surface and Coatings Technology, 2018, 334: 43-49. doi:10.1016/j.surfcoat.2017.11.003
LIU D Y, GUO J N, MA J L, et al. Effects of seed particle properties on coating in a wurster fluidized bed[J]. Industrial and Engineering Chemistry Research, 2023, 62(38): 15687-15698. doi:10.1021/acs.iecr.3c02662
YANG Z S, SONG H Y, YANG K M, et al. The physicochemical properties and the release of sodium caseinate/polysaccharide gum chlorophyll multiple-layer particles by rotary side-spray fluid bed technology[J]. Food Chemistry, 2022, 394: 133442. doi:10.1016/j.foodchem.2022.133442
FAN W H, DING Y J, XIAO Z L. A brand new green coating technology for realizing the regulation of spherical propellant energy release process[J]. Defence Technology, 2024, 36: 78-94.
YUAN S G, ZHOU T, TAN Z X. New straw coating material for improving the slow-release performance of fertilizers[J]. ACS Applied Materials and Interfaces, 2023, 15(33): 39818-39826. doi:10.1021/acsami.3c06408
SAIR S, ABOULHROUZ S, AMADINE O, et al. Bio-based alkyd urethane formulations: advancing sustainable agriculture and environmental protection through slow-controlled release of NPK fertilizers[J]. European Polymer Journal, 2023, 199: 112477. doi:10.1016/j.eurpolymj.2023.112477
LIANG D S, SHI H B, LU Q M, et al. Controlled-release fertilizers with an ultralow coating content[J]. Journal of Materials Chemistry A, 2023, 11(9): 4527-4538. doi:10.1039/D2TA08807J
EL-TAWEEL S H, AL-HAMDI A. Starch as a successful biodegradable nucleating agent in biodegradable PHBV/PHO blends[J]. Journal of Thermal Analysis and Calorimetry, 2024, 149: 1351-1364. doi:10.1007/s10973-023-12791-0
IRFAN S A, RAZALI R, KUSHAARI K, et al. Reaction-multi diffusion model for nutrient release and autocatalytic degradation of PLA-coated controlled-release fertilizer[J]. Polymers, 2017, 9(3): 111. doi:10.3390/polym9030111
TAO Y, XIA X S, LUO Z, et al. Preparation of modified polylactic acid melt coated urea material and its green coating technique[J]. Progress in Organic Coatings, 2022, 173: 107214. doi:10.1016/j.porgcoat.2022.107214