中空玻璃用弹性密封胶应用解析

针对中空玻璃用弹性密封胶的性能、应用知识以及中空玻璃制作、安装使用的相关应用问题进行了解释和分析.     

Injectable Self-Healing Natural Biopolymer-Based Hydrogel Adhesive with Thermoresponsive Reversible Adhesion for Minimally Invasive Surgery

Biocompatible hydrogel adhesives with multifunctional properties, including injectability, fast self-healing, and suitable on-demand detachment, are highly desired for minimally invasive procedures, but such materials are still lacking. Herein, an injectable self-healing biocompatible hydrogel adhesive with thermoresponsive reversible adhesion based on two extracellular matrix-derived biopolymers, gelatin and chondroitin sulfate, is developed to be used as a surgical adhesive for sealing or reconnecting ruptured tissues. The resulting hydrogels present good self-healing and can be conveniently injected through needles. The strong tissue adhesion at physiological temperatures originates from the Schiff base and hydrogen bonding interactions between the hydrogel and tissue that can be weakened at low temperatures, thereby easily detaching the hydrogel from the tissue in the gelation state. In vivo and ex vivo rat model show that the adhesives can effectively seal bleeding wounds and fluid leakages in the absence of sutures or staples. Specifically, a proof of concept experiment in a damaged rat liver model demonstrates the ability of the adhesives to act as a suitable laparoscopic sealant for laparoscopic surgery. Overall, the adhesive has several advantages, including low cost and ease of production and application that make it an exceptional multifunctional tissue adhesive/sealant, effective in minimally invasive surgical applications.     

航天胶粘剂的性能与应用

介绍了本单位研制的主要胶粘剂及其应用,包括聚氨酯、环氧树脂、有机硅,酚醛树脂、丙烯酸酯、碳硼烷、无机胶粘剂等100多种,广泛应用于火箭、卫星的结构和非结构件的粘接、套装、密封等,基本满足了航天产品对胶粘剂的需求。     

建筑密封胶老化的影响因素

建筑密封胶的老化行为一直是受到广泛关注的问题.目前,我国对建筑密封胶的老化行为研究还处于比较落后的阶段.在国外,从20世纪70年代就开始借助人工加速老化方法和室外自然老化方法研究密封胶的老化行为,从而得到了一系列影响密封胶老化的环境因素.通过对单因素老化和多因素老化的分析,对国内外密封胶的老化研究成果进行了概括和总结.     

铅酸蓄电池用密封胶的性能及其固化动力学研究

采用自制的环氧树脂和改性多胺固化剂制备了铅酸蓄电池密封胶。通过示差扫描量热法(DSC)对该体系的固化过程进行了研究,利用Kissinger,Crane方程对其固化反应进行了动力学分析并测定了体系的粘接性能。结果表明:该体系反应活化能Ea为54.76 kJ/mol,频率因子A为1.66×107/s,固化反应级数n=0.898,固化工艺为25℃/24～48 h+60～70℃/1～2 h,密封胶固化后的剪切强度达5.5 MPa以上。经相关电池厂家验证,可满足蓄电池壳盖密封的要求。     

Mechanical properties of solid oxide fuel cell glass-ceramic sealants in the system BaO/SrO-MgO-B2O3-SiO2

Planar solid oxide fuel cells (p-SOFCs) require materials that can satisfy the high mechanical demands related to their utilization in stationary and, especially, in mobile applications. Two suitable glass-ceramic sealants based on the system BaO/SrO-MgO-B₂O₃-SiO₂ have been characterized with respect to their mechanical properties such as hardness, Young’s modulus, flexural strength at room and elevated temperature, fracture toughness as well as creep behavior at relevant operation temperatures (800 °C). Fracture toughness was calculated from crack opening displacements (COD) and the results were compared with fracture toughness measured by bending tests of notched bar samples. The mechanical behavior has been discussed regarding different thermal aging times of the glass-ceramics and their microstructural evolution. The glass-ceramics containing SrO revealed a better mechanical behavior than glass-ceramics with BaO. In particular, several superior properties were found in comparison to previously reported materials for this application.     

灌缝材料粘附性的影响因素分析

为了探究不同施工与应用条件对灌缝材料粘附性的影响规律,分别在不同的湿度、腐蚀环境、温度和切缝工艺条件下设计对应的试验方案,通过多功能测试仪对不同方案下的成型的试件进行拉伸试验,根据拉伸试验结果对不同试样的粘附性进行定量的评价。结果表明:水降低了灌缝料的粘附性;腐蚀作用下灌缝胶粘附性基本消失;切缝处理对灌缝料的粘附性能产生较大幅度的削弱;温度冷热循环对灌缝料的粘附性能造成一定性能损失。     

国外粘合剂工业进展

综述近年度美国、日本、欧洲园家的粘合剂和密封剂工业现状,介绍在包装、建筑、运输、电子、制鞋、纺织、塑料、术材、仪器制造、医疗卫生等部门正在开展的胶粘产品,指出当前粘合剂工业发展动向、     

Catalyst Free Silicone Sealants That Cure Underwater

Silicone sealants and adhesives are widely used to prevent the ingress of water. However, silicones must normally be cured in air, as excess water inhibits or prevents cure from occurring. It is reported that aqueous solutions of the aliphatic aldehydes glutaraldehyde, glyoxal or, particularly, formaldehyde rapidly react without catalysts with a variety of aminopropyl‐modified silicone polymers to give silicone elastomers, even underwater. These products, whose properties are readily tailored by controlling the density of amino groups in the starting materials, may be 3D printed, or used both as adhesives and sealants in air or water.