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界面聚合法制备农药微囊剂 总被引:5,自引:0,他引:5
Ⅰ.前言 农药微囊剂可以用来降低农药对人畜的毒性、延长持效期、减少蒸发、避免药害、保护农药使其不至于在环境中快速降解、减少滴漏、降低农药在环境中的含量、增加农药的应用范围等。微囊剂的直径通常为1~100μm。 自从第一个微囊剂农药Penncap M商品化以来,至今已有25年。目前世界上已开发了约30种农药微胶囊制剂并用于商品化(如表1)。由表可见,绝大多数微胶囊制剂的活性成份为杀虫剂,而除草剂却很少,目前还没有杀菌剂制成微囊制剂。微囊剂的制备技术在日本用于防 相似文献
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农药微胶囊剂的加工和进展(Ⅰ) 总被引:8,自引:2,他引:6
微胶囊方法是农药剂型制备中一项重要的应用技术。它与常规农药剂型相比,具有延长持效期、降低对环境污染、降低毒性、改善抗雨性、有好的防效等优点,近年来受到普遍关注。论述微胶囊技术进展和农药微胶囊剂特点及其几种适合农药微胶囊剂工业规模生产的方法,认为在农药微胶囊剂开发中应优先开发微囊悬浮剂。同时也论述了农药微囊悬浮剂的配方组成、剂型稳定性、控制释放性能、实例、国外市场产品和应用。 相似文献
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农药微胶囊剂的加工和进展(Ⅱ) 总被引:3,自引:1,他引:2
微胶囊方法是农药剂型制备中一项重要的应用技术。它与常规农药剂型相比,具有延长持效期、降低对环境污染、降低毒性、改善抗雨性、有好的防效等优点,近年来受到普遍关注。论述微胶囊技术进展和农药微胶囊剂特点及其几种适合农药微胶囊剂工业规模生产的方法,认为在农药微胶囊剂开发中应优先开发微囊悬浮剂。同时也论述了农药微囊悬浮剂的配方组成、剂型稳定性、控制释放性能、实例、国外市场产品和应用。 相似文献
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农药的环境友好与剂型的科技创新 总被引:1,自引:0,他引:1
本文以环境和食品安全为目标、农药剂型更新换代为线索,综述了当前水基化农药新剂型的开发近况。并针对EW、ME、SL的应用、鉴别和环境安全评价、水悬浮制剂体系中分子长大现象及抑制、水分散粒剂、微囊剂、种衣剂、纳米材料技术的应用等制剂研究开发中若干热点和难点,结合作者近年来的科研实践进行了阐述。本文提出的观点和建议仅供交流和参考。 相似文献
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随着自修复技术的不断发展,微胶囊在防护涂层等领域日益表现出突出的应用优势。文中综述了单壁、双壁自修复微胶囊的配方设计与结构性能以及微胶囊的模拟仿真研究现状,综述了以异氰酸酯、环氧树脂、缓蚀-腐蚀抑制剂、植物油为修复剂的自修复微胶囊在防护涂层中的应用研究进展,总结了现有微胶囊自修复材料存在的问题,提出了将自修复微胶囊与分子动力学模拟相结合的研究方法,希望通过该方法建立微胶囊宏微观结构与性能的关联性规律,实现对微胶囊自修复机理的深入探索与研究。 相似文献
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Sidra Rama Yan Zhang Fideline Tchuenbou-Magaia Yulong Ding Yongliang Li 《Frontiers of Chemical Science and Engineering》2019,13(4):672
Carbon capture is widely recognised as an essential strategy to meet global goals for climate protection. Although various CO2 capture technologies including absorption, adsorption and membrane exist, they are not yet mature for post-combustion power plants mainly due to high energy penalty. Hence researchers are concentrating on developing non-aqueous solvents like ionic liquids, CO2-binding organic liquids, nanoparticle hybrid materials and microencapsulated sorbents to minimize the energy consumption for carbon capture. This research aims to develop a novel and efficient approach by encapsulating sorbents to capture CO2 in a cold environment. The conventional emulsion technique was selected for the microcapsule formulation by using 2-amino-2-methyl-1-propanol (AMP) as the core sorbent and silicon dioxide as the shell. This paper reports the findings on the formulated microcapsules including key formulation parameters, microstructure, size distribution and thermal cycling stability. Furthermore, the effects of microcapsule quality and absorption temperature on the CO2 loading capacity of the microcapsules were investigated using a self-developed pressure decay method. The preliminary results have shown that the AMP microcapsules are promising to replace conventional sorbents. 相似文献
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微囊化技术作为一项发展迅速的新技术,具有精确给药、芯材控释等特点,在生物医药、食品、化工等领域均得到成功应用。海藻酸钠是从海洋藻类提取的功能独特的植物多糖,具有良好的溶解性、成膜性和凝胶性等优势,已被广泛用作微囊的包膜材料。但海藻酸钠微囊易受到基质材料、交联剂和生产工艺参数的影响,性质难以调控,所以微囊的生产仍存在配方不完善、制备工艺不稳定等问题。为解决上述问题,本综述对海藻酸钠的离子交换性、pH敏感性、凝胶特性等性质和微囊制备过程的影响因素进行了总结。论述了海藻酸钠微囊在包封细胞、药物以及精油方面的应用,指出今后的研究方向应集中于改进微囊的制备工艺,探明海藻酸钠成膜机理与机械性能的关系,提高海藻酸钠微囊强度与韧性,继续推进海藻酸钠与其他高分子材料的复配研究,以期扩大海藻酸钠微囊的应用范围,加快海藻酸钠微囊的工业化进程。 相似文献
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以尿素、三聚氰胺和甲醛的预缩合物为壁材,过氧化苯甲酰为囊芯,采用原位聚合的方法制备了过氧化苯甲酰微胶囊。讨论了在过氧化苯甲酰微胶囊形成过程中不同种类的润湿分散剂及其用量、酸的加入速度等对微胶囊状态及粒径分布的影响,通过大量对比实验,得出制备过氧化苯甲酰微胶囊的最佳反应条件、适宜的分散剂及用量。同时,通过相关的胶黏剂配方试验表明,将制备的微胶囊应用于螺纹锁固厌氧胶中,取得良了好的效果,能够很好满足客户的技术要求。 相似文献
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Microencapsulation of chlorthalidone by spray-drying of double emulsion and melt granulation coating
Marco Antonio Salazar-Miranda Francisco Cruz-Sosa María Eva Rodríguez-Huezo Ruben Jiménez-Alvarado 《Drying Technology》2016,34(9):1118-1128
Chlorthalidone (CH) is indicated in the management of hypertension either alone or in combination with other antihypertensive drugs, but it displays poor solubility and stability limiting its use in the development of new pharmaceutical alternatives. Spray-drying of double emulsions (SDE) and melt granulation coating (MGC) technologies were used for enhancing the stability of CH by using Eudragit® L30D-55 (EUD), Opadry® II (OPA), or Kollicoat® IR (KIR) as wall materials. SDE and MGC microcapsules containing CH were evaluated for particle size, morphology, release profiles, accelerated storage, and thermo-oxidative stability. Both types of microcapsules showed higher solubility (>80% in 20 min), lower degradation (<2%) under accelerated storage condition, and lower thermo-oxidative degradation than pure CH. However, SDE microcapsules showed smaller particle sizes (<16 µm) than MGC microcapsules (>700 µm), which widens the opportunity of incorporating microcapsules to dosage forms requiring different particle sizes for achieving their functionality. 相似文献
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Preparation of acetamiprid-loaded polymeric microcapsules: Influence of preparation parameter in emulsion
system on microcapsule characteristics 总被引:1,自引:0,他引:1
Takayuki Takei Masahiro Yoshida Kazumi Yanagi Yasuo Hatate Kouichiro Shiomori Shiro Kiyoyama 《Polymer Bulletin》2008,61(1):119-127
Microencapsulation of pesticides is a promising technique for avoiding high initial doses and multiple
applications of the chemicals to agricultural land which cause environmental pollution. It is because the
formulation is possible to improve the stability of the chemicals against environmental degradation and
control the release rate. In the present study, polymeric microcapsules prepared by the solvent evaporation
method via water-in-oil-in-water (W/O/W) emulsion were used as immobilization supports of acetamiprid, a
water-soluble pesticide. The pesticide was loaded in the microcapsules by impregnating the polymeric supports
with acetamiprid dissolved in an organic solvent. Increased volume ratio (ϕ) of inner aqueous phase
to oil phase in the emulsion system contributed to more pores in the microcapsules and increase in the
content of acetamiprid in the polymeric supports. Release rate of acetamiprid from the microcapsules
could be controlled by changing ϕ. 相似文献
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Iturin A is a valuable biopesticide because of its strong antifungal effect, low toxicity, and wide antimicrobial spectrum. However, the current formulation for iturin A is unstable and not sustained in the field. Thus, the aim of this work was to develop stable microcapsules containing iturin A by spray drying. The optimal technical parameters for the production of iturin A microcapsules include sodium alginate and poly(γ-glutamic acid) for the wall materials (1:1(W:W)), 180°C for the inlet temperature, and 5:1 (V:W) for the core-to-wall ratio. The iturin A microcapsules have a spherical shape, good sustained release, high ultraviolet resistance, and are stable in storage. 相似文献
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以壳聚糖-海藻酸钠为囊材,采用乳化-外部凝胶法制备猪脾脏转移因子壳聚糖-海藻酸钠微囊,并研究了其粒径、载药量、包封率、体外释药等性质. 结果表明,经优化工艺所制微囊球形度良好,平均粒径11.05 mm,平均载药量11.60 mg/g,平均包封率60.8%,在磷酸缓冲液(pH=7.4)中的释药曲线方程为ln(1-Q)=-0.0692t-0.6449 (R2=0.9876),符合一级动力学方程. 该制备工艺简单,所制猪脾脏转移因子微囊具有良好的溶胀性能和缓释性能. 相似文献