微胶囊自修复技术及其在粘接涂层中的应用

将微胶囊加入到粘接涂层底漆中,赋予粘接涂层自修复的性能,从而延长其使用寿命,由此开创了智能粘接涂层的新领域。介绍了微胶囊自修复技术、微胶囊的自修复机理和微胶囊的种类,着重阐述了微胶囊自修复技术在粘接涂层中的应用研究现状,并对自修复微胶囊粘接涂层的研究前景进行了展望。     

仿生自修复防腐涂层的研究进展

介绍了实现材料仿生自修复功能的技术方法,在分析影响材料自修复效率因素的基础上,总结了选择微胶囊和修复剂体系应遵循的原则,综述了自修复防腐涂层中的最新研究成果,并指出自修复涂层目前存在的问题及今后研究的方向。     

微胶囊自修复复合材料的研究进展

微胶囊自修复复合材料是一种新型智能材料。本文对目前树脂基复合材料自修复的方法进行综述,着重介绍自修复复合材料用微胶囊的制备、表征方法,并详细介绍微胶囊在复合材料自修复中的应用及研究进展,讨论研究过程存在和急需解决的问题。     

基于p H敏感缓蚀剂微胶囊的自修复涂层的制备及对碳钢的腐蚀防护作用研究

以丙烯酸、丙烯酰胺和丙烯酸乙酯为单体合成了一种具有p H敏感性的聚合物，并以此负载磷酸二氢钾，形成缓蚀剂微胶囊，再将其与水性丙烯酸涂料复合，制备出了一种环保型自修复涂层。通过傅里叶变换红外光谱分析和Zeta电位测定，考察了微胶囊与涂料的相容性，采用扫描电镜观察自修复涂层的形貌特征，借助电化学阻抗谱和中性盐雾试验来评价自修复涂层对R235碳钢的腐蚀防护作用。结果表明：缓蚀剂微胶囊与涂料基体的相容性良好，可以均匀地分散于涂料中，形成的涂层表现出优异的自修复作用，能够显著提高对碳钢的腐蚀防护性能。     

自修复防腐涂层对海水中Q235钢耐蚀性能的电化学影响规律研究

制备用于潮湿环境中的自修复微胶囊及防腐涂层。利用扫描电镜观察微胶囊形貌,通过热重分析,获得其热稳定性数据。使用激光粒度分析仪测试其粒径分布规律。将其作为填料制成埋植型自修复防腐涂层,涂敷于Q235钢表面,采用电化学阻抗谱(EIS)研究其在海水中不同浸泡周期的腐蚀行为。结果表明在防腐涂层保护下,自修复微胶囊有阻挡海水渗透涂层的作用。微胶囊中的修复剂有填补涂层空缺的作用,增强了阻挡海水与Q235钢的接触作用。制备的自修复涂层具有修复划痕的功能。交流阻抗图表明该涂层能增强耐蚀性能。     

树脂基复合材料微胶囊自修复技术综述

微胶囊自修复技术通过在树脂中包埋胶囊来实现材料的快速损伤监测和起始损伤修复.本文综述了微胶囊修复技术中针对微胶囊形状和尺寸的参数优化方法.同时,综述了微胶囊在树脂基体中与裂纹作用的研究方法.分析了现有微胶囊自修复技术设计中存在的未考虑修复剂物理特性的问题.展望了未来微胶囊自修复技术与可视化材料监测及全局自修复材料技术相...     

微胶囊自修复聚合物材料的发展

对微胶囊自修复聚合物材料近年来一些新的研究进展进行了综述,包括微胶囊自修复聚合物材料技术的发展历程,荧光数字图像技术、光测弹性技术在微胶囊自修复聚合物材料研究领域的应用以及微胶囊／微血管自修复聚合物材料制备的技术要点。     

脲醛树脂胶黏剂的制备及其对木质乐器裂纹涂层性能的影响研究

自修复微胶囊作为一种可抑制木质乐器表面水性涂层微裂纹的新型有效途径,在音乐乐器涂料修复方面具备广阔的应用前景。对此,文章简述了树脂基微胶囊修复技术原理与研究现状,探究了脲醛树脂胶黏剂的制备与改性,以改性后的脲醛树脂胶黏剂为壁材、环氧树脂为芯材制备了微胶囊,添加到水性丙烯酸木器涂料中形成木器水性涂层,研究微胶囊的添加对木器水性涂层性能的影响。结果表明：脲醛树脂包覆环氧树脂微胶囊的芯壁材质量比为0.83∶1时,微胶囊分散均匀、形貌较好;在水性涂层中添加10%的微胶囊,水性涂层的综合性能较好;预制划痕试验表明,微胶囊含量为10%时,木器水性涂层裂纹的愈合程度较好。     

自修复聚合物材料用微胶囊的研究进展

自修复材料是一种新型的智能材料。将微胶囊埋植于材料中是实现其自修复的一种方法,也是目前该领域的研究热点之一。本文介绍了微胶囊型自修复的概念和原理,综述了近几年来DCPD型微胶囊、环氧树脂型微胶囊、硅油型微胶囊以及其他微胶囊型自修复的发展状况,并着重介绍了最新研究成果,对微胶囊型自修复材料的研究前景进行了展望。     

微胶囊修复技术在涂料中的应用研究

首先进行微胶囊功能粒子的合成,并利用光学显微镜、扫描电镜、热重、傅里叶变换红外光谱仪等对微胶囊结构及性能进行系统研究。然后将其添加到涂层中,探究其添加量和分散效果,制备了原位智能修复防腐涂层。研究了智能涂层在常压和压力交变条件下的自修复性能和防腐性能。结果表明：微胶囊在涂层中分散均匀,光学显微镜下可见涂层划痕处有聚合物产生。因此,涂层划痕处形成新的保护层,起到良好的自修复防腐蚀作用。     

Preparation of Tung Oil-Loaded PU/PANI Microcapsules and Synergetic Anti-Corrosion Properties of Self-Healing Epoxy Coatings

Tung oil is used as a catalyst-free repair agent. Tung oil-loaded polyurethane (PU) microcapsules are prepared by interfacial polymerization in a SiO₂-stabilized Pickering emulsion system, polyaniline (PANI) is deposited in situ on the PU microcapsule surface, and tung oil-loaded PU/PANI double-layer shell microcapsules are obtained. Synthesized PU/PANI microcapsules showed the characteristic dark-green color of conductive PANI. The average particle size is 31.1 ± 8.1 µm and the core content is 45.1 ± 4.3 wt%. The microcapsules have a good thermal stability, and the chemical structure of the PU/PANI wall and tung oil core is confirmed by Fourier transform infrared analysis. Self-healing anti-corrosion coatings are prepared by adding 10 wt% microcapsules into epoxy resin. The corrosion resistance properties of the self-healing coating are evaluated by immersing scratched coatings in 10 wt% NaCl solution for 15 days. The self-healing coating with 10 wt% tung oil-loaded PU/PANI microcapsules have the best anti-corrosion property, and slight corrosion do not occur until 15 days after immersion in salt solution. The self-healing and anti-corrosion mechanism are revealed. The tung oil core and the PANI wall of microcapsules contributed synergistically to the excellent self-healing and anti-corrosion properties of the coating through the formation of self-healing films and passivation layers.     

Preparation and evaluation of self-healing microcapsules for asphalt based on response surface optimization

The purpose of this study is to explore the best preparation process of asphalt self-healing microcapsules. Response surface design and single factor design were used to optimize the preparation process parameters of asphalt self-healing microcapsules, and the prediction model of core content was established. The optimal preparation process was determined. The results of response surface design showed that the interaction among emulsifier concentration/reaction temperature, core-shell ratio/reaction temperature, and pH/reaction temperature had significant effect on the core content of microcapsules; the microcapsules prepared by the optimal process were spherical with an average particle size of 90.19 μm. The results of thermogravimetric analysis (TGA) and heating simulation test showed that the microcapsule can delay the damage of the core in high temperature environment; the results of nanoindentation test showed that the young's modulus and hardness of the microcapsules were about 2.50 and 0.28 GPa, respectively. Finally, the improvement mechanism of self-healing performance of asphalt by microcapsules was revealed by fluorescence microscope.     

The study on the mechanical properties of PU/MF double shell selfhealing microcapsules

The self-healing microcapsules can be buried in the coating to improve the anticorrosive ability. In this paper,self-healing microcapsules of polyurea(PU)/melamine resin(MF) double shell were prepared by in-situ polymerization and interfacial polymerization with isocyanate as the core material. Scanning electron microscope was used to observe the microcapsule morphology. The structures of microcapsules prepared with different chain extenders were characterized by Fourier transform infrared spectroscopy. The micromanipulation system was used to loading–holding, loading–unloading and loading to rupture individual microcapsules, so as to explore the mechanical properties of microcapsules. The Young's modulus corresponding to microcapsules was calculated by mathematical model fitting. The self-healing properties of microcapsule coating were characterized by optical microscope. The experimental results showed that the microcapsule shell prepared under optimized conditions had a complete morphology and good mechanical properties. The microcapsule was in the elastic deformation stage under small deformation, and the plastic deformation stage under large deformation. The Young's modulus range of microcapsules was 9.29–14.51 MPa, and the corresponding Young's modulus could be prepared by adjusting the process. The surface crack of the coating containing microcapsule could heal itself after48 h in a humid environment.     

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。     

微胶囊制备技术及其聚合物基功能复合材料研究与应用进展

介绍了微胶囊中芯材与壁材的结构,以及对制备微胶囊所需条件和常用于制备微胶囊的芯材与壁材的物质。分析了常用的原位聚合法、界面聚合法、乳液聚合法、Pickering乳液聚合法、悬浮聚合法、种子微悬浮聚合法、掺杂种子微悬浮聚合法、聚合诱导相分离法和物理制备法共9种方法。介绍了微胶囊在相变储能、隐身、自润滑、自修复等功能材料中的应用。展望了微胶囊的应用前景。     

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。     

微胶囊技术及其在复合材料中的应用

介绍了微胶囊技术的概念及其种类,归纳总结了微胶囊的表征方法。根据微胶囊近年来的研究,重点阐述了微胶囊技术在聚合物基复合材料损伤自修复过程中的应用研究。     

异氰酸酯胶囊型自修复高分子材料研究进展

回顾了微胶囊型自修复高分子材料中双环戊二烯-Grubbs催化剂、聚二甲基硅氧烷-锡(铂)催化剂、环氧树脂-固化剂和异氰酸酯等自修复体系的研究现状,重点介绍了异氰酸酯胶囊型自修复材料的修复机理和研究新进展。异氰酸酯胶囊型自修复是通过异氰酸酯修复剂(主要是异佛尔酮二异氰酸酯、六亚甲基二异氰酸酯及其三聚体等)潮固化来实现,并简要探讨了影响微胶囊自修复高分子材料自修复效果的主要因素(微胶囊的芯材、力学性能以及微胶囊与基材的相容性)。最后指出了微胶囊型自修复高分子材料今后的研究方向(建立自修复过程的模型,将微胶囊应用到存在一些如晶界、气孔等微结构的材料中)及其应用前景(提高航空航天和民用高铁等高速高风险项目的可靠性,开发自修复涂料、胶黏剂等)。     

Molecular Self-Assembled Microcapsules Prepared by In Situ Polymerization Technology for Self-Healing Cement Materials

Monodisperse core–shell microcapsules have been widely used as self-healing cement materials and paid more attentions. A new series of self-assembled microcapsules containing poly(styrene-divinylbenzene) as shell material were prepared by in situ polymerization technology. The microencapsulating process of core material using mixture of epoxy resins and benzyl alcohol was monitored using optical microscopy (OM). Morphology and shell wall thickness of microcapsule were observed using scanning electron microscopy and OM, respectively. The effects of different weight ratios of core–shell and the agitation rates on the physical properties of microcapsules were investigated. The size and surface morphology of microcapsule can be controlled by selecting different processing parameters.