硅酮密封胶在铝合金隐框幕墙中的应用

铝合金隐框幕墙对硅酮密封胶的性能和质量有严格要求。文章介绍了硅酮密封胶的种类、性能及使用方法,并详细说明了采用硅酮密封胶制作结构玻璃装配组件的过程。     

Diopside – Mg orthosilicate and diopside – Ba disilicate glass–ceramics for sealing applications in SOFC: Sintering and chemical interactions studies

Diopside (CaMgSi₂O₆) based glasses compositions containing magnesium orthosilicate or barium aluminosilicates phases have been appraised for sealing applications in solid oxide fuel cells (SOFCs) and other solid-electrolyte devices. The sintering behavior and crystalline phase evolution of glass powders has been investigated under isothermal and non-isothermal conditions in the SOFC operating temperature range (800–900 °C). All the glass compositions exhibited two-stage shrinkage behavior resulting in well sintered and mechanically strong glass–ceramics with Augite as the primary crystalline phase. The appropriate coefficient of thermal expansion (CTE), long term thermal stability (300 h at 900 °C), high electrical resistivity, good adhesion and minimal reactivity with SOFC components makes the investigated glass–ceramics potential candidates for further experimentation as SOFC sealants.     

封孔处理对等离子喷涂Cr2O3-8TiO2涂层耐腐蚀性能的影响

为了提高等离子喷涂陶瓷涂层的耐腐蚀性能,扩大其应用范围,以环氧树脂和有机硅树脂为封孔剂对等离子喷涂Cr2O3-8TiO2涂层进行了封孔处理,采用盐雾腐蚀和电化学腐蚀方法对封孔涂层和未封孔涂层的耐腐蚀性能进行研究,使用扫描电镜/能谱仪(SEM/EDS)、光学显微镜(OM)观察了腐蚀前后涂层的形貌及成分变化,分析涂层的腐蚀机理.结果表明,240h盐雾腐蚀后未封孔涂层发生剥落失效,而有机硅树脂封孔涂层经1200h盐雾腐蚀表面仍保持完好.封孔涂层的耐腐蚀性明显优于未封孔涂层,有机硅树脂的封孔效果优于环氧树脂.     

Novel gelatin–alginate surgical sealants loaded with hemostatic agents

Surgical sealants are an integral part of the surgical toolbox. They are used mainly to seal tissues or suture lines. In the current research, we examined a novel surgical sealant based on the natural polymers gelatin and alginate, crosslinked with carbodiimide and loaded with hemostatic agents. Incorporation of the hemostatic agent montmorillonite significantly improved the ex vivo burst strength and the other physical properties (swelling ratio, weight loss, curing time, and viscosity) of the basic surgical sealant, due to the formation of nanocomposite structure. This novel system presents a new approach for improving the physical properties of surgical sealants.     

New liquid polysulfide polymer terminated with silyl group

The terminal SH of liquid polysulfide polymer was capped with a silyl group. This polymer was hydrolyzed immediately by moisture at ambient temperature and returned to the original polymer. The compounds of this new polymer and the various curing agents of the conventional polysulfide polymer became moisture curable and of use as one‐component sealants and adhesives. The curing speed of these compounds is very fast compared with that of not only conventional one‐component polysulfide sealants, by more than three times, but also of other one‐component sealants at 20°C under 30% humidity. Their storage stability is good. Their cured products showed physical properties comparable to those of the two‐component polysulfide compounds. In particular, the compound of this polymer and isocyanate prepolymer showed good elasticity and good weatherability. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 93: 2642–2649, 2004     

国内聚氨酯密封胶研究进展

介绍了国内在传统单组分湿固化密封胶、硅烷改性单组分密封胶、蓖麻油基及丁(腈)羟聚氨酯双组分密封胶提高性能方面的最新研究进展。     

单组分聚氨酯玻璃粘合密封胶在汽车生产中的应用

概述了玻璃密封胶的性能特点,重点介绍了单组分聚氨酯粘合密封胶在汽车生产中的装配工艺和维修方法。     

国内建筑用密封胶的研究进展

对比聚硫型、硅酮型、聚氨酯型密封胶的性能特点,从单组分密封胶和双组分密封胶两个角度综述了国内近几年的研究进展,并介绍了密封胶在建筑等行业的应用。     

Assessment of the sealant/tooth interface using optical coherence tomography

Sealant materials are typically employed in dentistry in order to prevent the development of cavities on the teeth. They prevent bacterial adhesion to enamel, thus arresting the development of demineralization and of caries. In this study, the critical zone of the interface between different sealant materials and the results of the dental work for the teeth processed were investigated ex vivo using swept source (SS) optical coherence tomography (OCT). Optical inspection and X-ray investigation revealed no defects, while SS-OCT proved capable to asses exactly the position, the nature, and the dimensions of each type of these defects. Specifically, different failures were targeted into the structure of pit and fissure sealants, including bubbles, internal cracks, structural defects of sealant material, and structural defects of enamel, with uncovered sealant material and enamel/sealant interface (marginal integrity and marginal adaptation of dental sealant). The investigation of the possible types of defects that may appear into this dental interface was thus accomplished – for the dental practitioner.     

中空玻璃密封胶的应用及发展趋势

介绍了国内外中空玻璃密封胶的应用和发展趋势