Synthesis of trimellitic anhydride microcapsule toner by liquid‐phase separation

A microcapsule toner containing trimellitic anhydride for use as a foam inhibitor in printing applications was synthesized by liquid‐phase separation in organic solvents. It is possible to determine materials appropriate for the microencapsulation of trimellitic anhydride from solubility parameters calculated on the basis of the molecular structures of raw material candidates. Considering solubility parameters of various polymers, the polyethylene/methacrylic acid copolymer was selected for the microcapsule wall material. In addition, two kinds of solvents, toluene [solvent (a)] and isoparaffin [solvent (b)], were employed. It was necessary for the microcapsule materials to meet the following conditions: (1) the wall material must completely dissolve in solvent (a); (2) the core material must disperse well, but not dissolve in solvent (a); and (3) the wall and core materials must not dissolve in solvent (b). By using mixtures of either lecithin and basic barium petronate or lecithin and basic calcium petronate as charge control agents, the trimellitic anhydride microcapsules could be charged either positively and negatively, respectively. The microcapsule toner fabricated in this method was successfully applied in commercial printing machines, where it inhibited foaming effectively enough to satisfy product requirements in the printing industry. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 3822–3826, 2003     

微胶囊技术在含重金属废水处理中的应用

微胶囊技术在重金属废水处理方面的应用日趋显著,作为一种新型的废水处理技术被广泛研究。文章系统阐述了国内外研究者对微胶囊在重金属污水处理中的应用研究及取得的成果,并简要介绍了螯合树脂微胶囊、萃取剂微胶囊、磁性微胶囊三者在水处理中的不同应用,为微胶囊技术的发展提供一定的参考价值。     

Potential use of microcapsules in manufacture of fibrous products: A review

The present survey shows that microcapsules are used as effective tools for modification and functionalization of fibrous products. The core and shell materials of microcapsules can comprise various active ingredients in accordance with different requirements of final fibrous products. In this survey, the morphology, functional properties and added values of microcapsules, also such advanced types as nanocapsules, bi-, multifunctional microcapsules, and their applications in smart and other modern products are described. Some relevant applications of microcapsules in industrial processes are briefly discussed. The techniques used to encapsulate the core ingredients are also overviewed. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47066.     

温度控制瞬间释放微胶囊

对国内外有关温度控制瞬间释放微胶囊及其微胶囊化技术进行了综述，介绍了其释放原理。列举了石蜡等制备微胶囊的囊壳材料以及熔化分散冷凝法、锐孔—凝固浴法和喷雾冷却法等三种制备方法，并展望了其应用前景。     

羧甲基纤维素-壳聚糖LbL空腔微胶囊的制备

微胶囊技术现已广泛应用于生物医药,环境保护,日用化工,农业科学及航空航天等领域,随着应用范围扩大,开发新技术与新方法制备微胶囊,使其具有更精确可控的结构已成为微胶囊技术发展的重大课题之一。选择两种生物相容性较好的天然聚电解质—羧甲基纤维素(CMC)和壳聚糖(CS),作为制备新型微胶囊的原料,利用聚阴离子羧甲基纤维素和聚阳离子壳聚糖之间的静电结合,成功制备出一种具有新结构的中空聚电解质微胶囊并初步研究了其形貌能基本性能。     

自修复聚脲甲醛微胶囊的制备及成囊机理研究

采用原位聚合法制备了自修复聚脲甲醛包覆环氧树脂微胶囊。考察了原料用量、反应温度、酸化值和固化时间等对微胶囊粒径分布和表面形态的影响,确定了微胶囊的最佳制备工艺。借助显微镜实时监测微胶囊化过程,探讨了微胶囊的成囊机理,并将微胶囊填充到脲醛树脂中。结果表明:采用最佳制备工艺制得的微胶囊包覆率较高、结构紧密、粒度均匀,室温下保存一周后没有出现团聚和破裂;将9%微胶囊添加到脲醛树脂中,微胶囊分散均匀,脲醛树脂复合材料的韧性得到提高。     

Protein–Polymer Microcapsules for PCR Technology

Protein–polymer microcapsules have attracted much attention, due to their special features and potential in biological use. How to make the most of this type of bio‐abiotic hybrid material is an intriguing question. Nevertheless, several unsatisfactory technical issues significantly limited the application of these materials. For instance, introducing various biomolecules and crosslinking for the capsules remains challenging and problematic. In this report, recombinant mCherry protein was covalently linked with poly(N‐isopropylacrylamide) (PNIPAAm) to form amphiphilic protein–polymer conjugates, which assembled into microcapsules. These microcapsules are thermoresistant and can be used in the polymerase chain reaction (PCR). In this setting, the reactant molecules can be readily and easily introduced into the microcapsules, and crosslinking and water–oil phase transition are not necessary. This protein–polymer microcapsule PCR system has potential in various biological applications.     

季铵化壳聚糖包覆腐殖酸微胶囊的制备与性能研究

以季铵化壳聚糖（QCTS）为壁材、腐殖酸(HA)为芯材,制备季铵化壳聚糖包覆腐殖酸(QCTS/HA)微胶囊。采用傅里叶红外光谱(FTIR)、偏光显微镜(POM)、扫描电子显微镜(SEM)对微胶囊的性能进行表征。以芯壁比〔m(HA):m(QCTS)〕、固化剂用量和搅拌速度作为单因素,探讨了微胶囊的最佳制备条件。并且对最佳制备条件下的微胶囊进行了形貌观测以及吸水和保水性能测试。结果表明,QCTS/HA微胶囊的最佳工艺参数为：m(HA):m(QCTS)=3:1,固化剂用量为总质量的1%,搅拌速度为500r/min;与相同条件下未改性的微胶囊CTS/HA相比,改性后的QCTS/HA微胶囊包覆层表面孔隙结构比较完善,分布均匀,孔洞较多,具有更加优异的吸水和保水性能,其12h的吸水率和保水率分别高达348%和208%。 关键词：季铵化壳聚糖;腐殖酸;核壳结构;微胶囊;吸水性能,保水性能     

微胶囊技术在胶黏剂中的应用

概述了微胶囊的发展历程和结构特征,综述了微胶囊的制备原理及方法,对三种制备微胶囊的方法-化学法、相分离法和物理法进行了比较.介绍了微胶囊的应用及其最新研究进展.用在胶黏剂领域的微胶囊技术进步很快,特别在微胶囊的设计方面,现在可以根据用途提供种类繁多的胶黏剂,以前无法解决的问题,现在通过微胶囊结构的设计,可以得到圆满解决.讨论了微胶囊制备技术在胶黏剂领域的应用,主要探讨了微胶囊厌氧胶黏剂、微胶囊压敏胶黏剂和微胶囊环氧树脂胶黏剂的制备和应用,展望了微胶囊胶黏剂的应用前景.     

微胶囊技术与影像材料

起源于20世纪50年代的微胶囊技术,在近年来成为功能性材料制备中一项重要的技术。本文概述了微胶囊的定义、基本形态、分类及特点;依据囊壁形成的机制和成囊条件,综述性介绍了各种常用的微胶囊化方法及其简单机制。同时,重点介绍了在影像材料方面,微胶囊的制备和释放的机理,以及在这个方面,微胶囊技术的各种应用及进展。     

Synthesis of Zinc Stannate Microcapsules for Preparation of Flame-Retardant PVC Composites

A multilayer microcapsule [melamine-formaldehyde resin/aluminum hydroxide/zinc stannate] with unique core–shell structure was prepared. Fourier transform infrared, X-ray photoelectron spectroscopy, thermogravimetric analysis, and transmission electron microscope were used to investigate the chemical structure of the microcapsules, fire retardancy, and thermal stability of polyvinyl chloride with these materials as additives were also investigated. Remarkably, addition of certain amount of melamine-formaldehyde/aluminum hydroxide/zinc stannate microcapsules could evidently increase limiting oxygen index values. The smoke density results showed that polyvinyl chloride containing melamine-formaldehyde/aluminum hydroxide/zinc stannate microcapsules produced less smoke than pure polyvinyl chloride. The morphologies of the residues were revealed by scanning electron microscope, ascertained that the formed char layers on the composites were denser than that of the pure polyvinyl chloride and polyvinyl chloride/aluminum hydroxide/zinc stannate microcapsule composites. Furthermore, the mechanical properties of polyvinyl chloride/melamine-formaldehyde/aluminum hydroxide/zinc stannate microcapsule composites were observably improved, highlighting its promising potential in industrial applications.     

3D打印在弹性体领域的应用

以弹性体为打印材料的3D打印技术为熔融沉积快速成型、立体光固化、选择性激光烧结和聚合物喷射。简介热塑性弹性体打印材料和热固性弹性体打印材料,概述3D打印技术在弹性体制品生产中的应用,综述3D打印技术在弹性体领域的发展和挑战。光硫化或光固化是橡胶领域3D打印技术的发展趋势。     

3D打印用ABS研究进展

介绍了三维（3D）打印技术、熔融沉积成型（FDM）与3D打印用丙烯腈丁二烯苯乙烯共聚物（ABS）存在的问题,讨论了3D打印用ABS材料的成分配方、制备工艺、打印工艺、性能与用途,并指出加大对ABS材料的研究力度,使其能够应用于3D打印的同时,不断提升其打印制品的力学性能,赋予其多种特殊性能,以扩宽3D打印ABS材料的应用范围,是重要的研究方向之一。     

Synthesis of durable microcapsules for self-healing anticorrosive coatings: A comparison of selected methods

Self-healing materials have the ability to ‘repair’ themselves upon exposure to an external stimulus. In the field of coatings, extensive laboratory research has been conducted on these so-called smart materials in the last decade. In the present work, a self-healing concept for epoxy-based anticorrosive coatings, based on incorporation of microcapsules, filled with reactive agents, into the coating matrix, is investigated. Upon small damages to the coating, the reagents are released from the capsules and react, thereby forming a cross-linked network, which heals the crack. However, for the concept to work, microcapsules have to be strong enough to remain intact during storage and coating formulation and application. Furthermore, the capsules must remain stable for many years in the dry coating. Laboratory experiments, using four out of several encapsulation methods available in the literature, have been conducted to investigate the challenges associated with the synthesis of stable microcapsules. It was found that the nature of the core material strongly affects the microcapsule stability and performance. Furthermore, it was evident that experimental procedures developed for certain core materials were not suitable for encapsulation of other compounds without modifications. This is a severe limitation as not many of the encapsulation procedures have been developed for industrially relevant core materials such as epoxy resin. Results of experiments, aiming at finding optimal conditions for robust microcapsule production, are discussed.     

基于六官能度异氰酸酯用于自修复防腐涂料的微胶囊的制备与表征

微胶囊自修复技术是将自修复微胶囊埋植于基体,在破坏后实现自我修复。IPDI作为低官能度异氰酸酯在湿气中固化修复能力有限,本文设计基于六官能度异氰酸酯DiPE-IPDI/DiPE-TDI合成用于自修复防腐涂料的新型微胶囊,着重对六官能度异氰酸酯DiPE-IPDI合成过程中溶剂、温度进行反应条件优化,通过傅里叶红外光谱、核磁等对产物结构进行表征。同时对微胶囊制备过程中粒径结构进行可控组装, 通过TGA/DSC表征该自修复微胶囊热力学性能。制备负载微胶囊的自修复环氧树脂基防腐涂料,盐雾试验结果显示其具有优异的自修复性能。     

微胶囊技术在纺织上的研究进展

综述了微胶囊技术近几年的应用发展,描述了界面聚合法、原位聚合法、复合凝聚法等几种常用微胶囊制备技术,以及微胶囊应用技术近几年在实际研究中的作用。着重介绍了微胶囊在纺织后整理、印花、染色中的作用。通过几种研究技术的比较和在各个领域应用的综述,找出微胶囊技术在纺织领域应用中的注意事项和它本身存在的技术局限性,并对微胶囊技术的未来进行了展望。     

农药微胶囊剂的研究现状与展望

综述了农药微胶囊剂的国内外研究进展及应用现状。在总结农药微胶囊芯材与壁材种类及农药微胶囊制备方法的基础上,对难溶性农药微胶囊化方法、吸附型缓控技术、包合型缓控技术以及化学键合缓控技术等研究进展进行了概述,指出了我国农药微胶囊研发中存在的问题,对其发展方向作出了展望。     

Tuning alginate-bentonite microcapsule size and structure for the regulated release of P. putida Rs-198

In this study, different sizes of microcapsules with alginate and bentonite as natural macromolecular materials were prepared to investigate the release property of Pseudomonas putida Rs-198. The characteristics of three microcapsules were evaluated by SEM, FTIR, TG-DSC, XRD and wall thickness. The sizes of three microcapsules (MA, MB, and MC) were 1270.50, 831.79 and 42.52?μm, respectively. First, the encapsulation efficiency of three MA, MB, and MC microcapsules were 82.20%, 90.41%, and 85.84%, respectively. Second, the contact angles of MA and MB samples were similar, while smaller microcapsules MC have higher contact angle (85.05°), indicating poor hydrophilia and decreasing the swelling degrees. Third, the release cumulant of Rs-198 and macromolecule BSA linear stage was fitted to self-established mathematic model. Results show that the microcapsule size had a considerably positive effect on release detail. The large microcapsule possessed strong leak-tightness for Rs-198 as a slow-release microbial agent. Furthermore, the porosity of microcapsules determined their swelling and release and may affect bacterial growth and survival. In conclusion, the Rs-198 microcapsule with different sizes will be pertinently selected based on the characteristics of agricultural production requirements.     

Caprolactam recovery by a column packed with polysulfone microcapsules containing 1-octanol

Caprolactam recovery from its dilute aqueous solution is a challenging task in industry. To save resources and protect environment, a caprolactam recovery technology based on extractant microcapsules as the separation material was introduced. In this new technology, polysulfone microcapsules containing 1-octanol were packed in a column. In the extraction process, recovery ratio of 0.99 was achieved within 0.6 bed volume. More than 10 theoretical plates per meter microcapsule column were realized. In the regeneration process, sulfuric acid aqueous solution was introduced as the stripping agent. Accordingly the new technology can be integrated with existing caprolactam production process because the eluent could be returned to NH₃ causticization section. Caprolactam was successfully stripped and concentrated. Caprolactam concentration of 112 g/L in the eluent was obtained. New technology based on extractant microcapsules shows high efficiency in caprolactam recovery.     

Interfacial polymerization of an epoxy resin and carboxylic acids for the synthesis of microcapsules

BACKGROUND: Microencapsulation technology promises new applications such as intelligent microstructures, phase change materials and self‐healing composites. Microcapsule synthesis and characterization have been researched extensively; however, the well‐known polymerization between epoxy resins and carboxylic acids has not been used to prepare microcapsules. RESULTS: Microcapsules were prepared by interfacial polymerization of an oil‐in‐water emulsion which contained a commercial epoxy resin and multifunctional carboxylic acids. The microcapsules obtained were characterized using optical microscopy and scanning electron microscopy. Experiments performed at lower stirring rates led to larger microcapsules, in the range 100–400 µm, while higher stirring rates resulted in microcapsules in the range 10–50 µm. CONCLUSIONS: Microcapsules can be prepared by interfacial polymerization of epoxy resins, an extensively studied and widely used class of polymers. By means of NMR characterization we gained insight into the mechanism of polymerization at the interface wherein products coming from the more hindered ring opening as well as from intermolecular transesterification are identified. The presence of a crosslinker affects the morphology of the external microcapsule surface. Copyright © 2008 Society of Chemical Industry