共查询到19条相似文献,搜索用时 93 毫秒
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以硅烷改性聚醚树脂为基础聚合物,制备装配式建筑单、双组分MS密封胶,并对其性能进行了对比分析。研究结果表明:催化剂的用量和温度会影响表干时间,装配式建筑单组分MS密封胶催化剂用量以控制在0.16%为宜,10 mm深度固化时间≥72 h;双组分催化剂用量以控制在0.60%为宜,10 mm深度固化时间≤24 h;装配式建筑单、双组分MS密封胶宜选择聚酰胺蜡类触变剂,用量为1%;装配式建筑单组分MS密封胶的粘接效果、施工效率均优于双组分MS密封胶,单组分MS密封胶损耗量为15%左右,双组分MS密封胶损耗量为5%左右。 相似文献
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为提升建筑外墙保温板的使用寿命,制备装配式建筑外墙保温板接缝用改性聚醚密封胶,并通过试验分析该密封胶性能。以封端硅烷偶联剂和异腈酸酯基硅烷作为改性剂,聚醚元醇作为基料制备改性聚醚密封胶,应用在装配式建筑外墙保温板接缝中。依据标准测试该密封胶的表观性能,研究养护时间、紫外光照对该密封胶的粘接强度影响,分析催化剂和填料用量对于该密封胶表观性能与拉伸性能影响。试验结果表明,该密封胶表观性能符合标准,养护7 d后粘接性能基本稳定,催化剂用量20%,填料用料30%时表观性与拉伸性能最好。 相似文献
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综述了单组分聚氨酯密封胶贮存稳定性的各种影响因素,讨论了预聚体的合成、催化剂和固化剂的选择及填料、脱水剂以及灌装工艺等对单组分密封胶贮存稳定性能的影响,提出了提高单组分聚氨酯密封胶贮存稳定性的措施. 相似文献
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研究了ZDM-95密封胶的制备方法和生产工艺,它是由羟基硅油,白炭黑、交联剂、催化剂等配制而成。着重讨论了羟基硅油分子量和交联剂添加量、白炭黑粒度对密封胶质量的影响,并对密封胶的物理和机械性能进行了测定。 相似文献
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于剑昆 《化学推进剂与高分子材料》2005,3(5):8-13
叙述磷腈类催化剂的合成方法及其在聚醚多元醇生产中的应用。重点介绍用该类催化剂生产的聚醚多元醇在聚氨酯软泡、硬泡、弹性体、防水涂料、水分散液、密封剂、硅改性聚醚密封剂、合成润滑油、非离子表面活性剂等领域中的应用,并与传统工艺生产的聚醚多元醇进行了比较。 相似文献
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The state of the production of low-molecular-mass rubbers and sealants on their basis in Russia is considered. The history of sealant development is described; organizations and scientists that made the largest contribution to the elaboration and industrial production of these materials are reported. Classification of sealants and the mechanism of their vulcanization are considered. The main attention is paid to materials developed at the All-Russia Institute of Aviation Materials. The sealant brands most widely used in the aircraft industry are presented and their properties are described. Prospective problems in the field of sealant development are considered and the ways of their solution are outlined. 相似文献
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室温固化双组分聚氨酯灌封胶的制备 总被引:1,自引:0,他引:1
选用聚合物H和改性异氰酸酯K为主要原料合成聚氨酯灌封胶。测试了材料各项性能。结果表明,该材料具有优良的耐水性、耐腐蚀性和电性能,非常适合电信电缆接头灌封和电子行业的灌封。 相似文献
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Roxana Oancea Adrian Bradu Radu Marcel Negru Meda Lavinia Negrutiu 《Journal of Adhesion Science and Technology》2013,27(1):49-58
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. 相似文献