共查询到20条相似文献,搜索用时 109 毫秒
1.
研究了硫化条件对单组分室温硫化 (RTV - 1 )、双组分室温硫化 (RTV - 2 )有机硅结构密封胶性能的影响 ,A、B组分的比例对RTV - 2有机硅结构密封胶性能的影响和试验速度对 (RTV - 1 )结构密封胶拉伸性能的影响。结果表明 :RTV - 2有机硅结构密封胶的硫化速度比RTV - 1有机硅结构密封胶的硫化速度快 ,幕墙单元件只需养护 3天即可搬运和安装 ;RTV - 1有机硅结构密封胶必须养护 1 0天以上。提高硫化温度对提高RTV - 1有机硅结构密封胶硫化速度的作用十分明显 ,产品在出厂检验时可以使用 5 0℃× 7天的加速硫化方式 ;RTV - 2和RTV - 1有机硅结构密封胶产品均不适合在低温条件下使用 ;RTV - 2有机硅结构密封胶两组分的质量比对其性能有明显影响 ,其最佳使用量在 1 0∶1~ 1 4∶1之间 ;在一定范围内试验速度对RTV - 1有机硅结构密封胶拉伸性能的影响不大 相似文献
2.
有机硅密封胶广泛应用于工业领域的粘接密封,为了系统地研究有机硅密封胶的结构-性能,采用甲基三甲氧基硅烷等4种不同结构的交联剂,设计合成了4种有机硅密封胶。通过测定4种不同结构的有机硅密封胶的拉伸强度、剪切强度和剥离强度,并采用线性回归方法研究了交联剂对有机硅密封胶的力学性能、粘接性能的影响。结果表明,交联密度与密封胶的硫化胶的拉伸强度有很好的线性相关性,交联密度是影响密封胶粘接强度和粘接功的重要因素。 相似文献
3.
将3种室温硫化(RTV)有机硅结构密封胶拉伸粘结性试件放置于海南热带环境试验基地暴露5年,每年取一定数量的试样测试其拉伸粘结性能,研究湿热带气候对其拉伸粘结性能的影响。结果表明,在海南湿热气候环境下连续暴晒5年后,双组分脱醇型有机硅结构密封胶的最大拉伸粘结强度除第1年下降8%外,后面4年都在增长,共增长了14%;单组分脱醇型有机硅结构密封胶的最大拉伸粘结强度在约5%的范围内波动;单组分脱肟型有机硅结构密封胶的最大拉伸粘结强度下降14%。3种密封胶在最大拉伸粘结强度时的伸长率在第1年都有较大幅度下降,双组分密封胶的下降幅度为35%,两种单组分密封胶的下降幅度约50%;后面4年在第1年基础上小幅波动。湿热气候环境下均无粘结破坏。 相似文献
4.
5.
美国道康宁公司近期研发了一种有机硅结构密封胶,用于防水和玻璃装配,能够更有效地保护建筑结构并防止渗漏。有机硅结构密封胶可加固建筑外立面和玻璃单元,使薯承受极端温度波动、阵风冲击、酸雨腐蚀、紫外光辐照、雷暴袭击、地震冲击等,保护建筑物免受台风、飓风、 相似文献
6.
时间对缩合型RTV有机硅密封胶硬度的影响 总被引:1,自引:1,他引:0
跟踪检测了缩合型室温硫化(RTV)有机硅密封胶硫化后在标准条件、室内和室外暴露三种环境下24个月的硬度.结果发现,缩合型RTV有机硅密封胶的硬度在硫化12个月之内随时间的延长有增长趋势,室外暴露下增长最大,室内放置时增长次之,标准条件下放置时增长最小;有机硅密封胶的硬度值在硫化6~15个月内有明显变化,随着时间的推移,变化越来越小,一年以后基本趋于稳定;脱醇型双组分有机硅结构密封胶和酸性大板玻璃用有机硅密封胶的硬度增长最小,脱醇型单组分有机硅结构密封胶的硬度增长次之,酮肟型有机硅密封胶的硬度增长最大. 相似文献
7.
8.
9.
10.
11.
12.
13.
介绍了有机硅橡胶密封剂用JLTJ-001型脱胶剂的配方及性能影响因素。研制的JLTJ-001型脱胶剂能有效去除零件上残留的有机硅橡胶密封剂。 相似文献
14.
A. Pantaleo D. Ferri D. Roma A. Pellerano 《Journal of Adhesion Science and Technology》2013,27(11):1259-1277
This paper provides a quantitative measure of the bonding strength of structural silicone sealant applied to wood–double glazing glass joints for wood frame applications. The joint strength is assessed by tensile and shear experimental tests. The paper aims to characterize the joint behaviour through experimental tests in order to implement and validate a finite element (FE) model of the joint that can be used for whole frame characterization. The experimental tests are carried out on three wood species (Meranti, White Oak and Pine), and two different FE models of the wood–silicone–glass joint are implemented: the first basic model assumes the modulus of elasticity and modulus of rupture of the silicone as provided by the manufacturer, while the second model assumes the results of the experimental tensile tests. The results of the first FE model do not fit well with the tests carried out, while the second FE model proves to be more reliable and is validated by experimental results. The results report that, when modelling wood–double glazing glass joints by FE methods, the equivalent structural sealant modulus of elasticity assigned in the model should be about 50% lower than what is declared by the manufacturer. This result can be useful when modelling whole wood frames and dimensioning sealant depth and thickness in wood–glass joint applications. 相似文献
15.
新型泡沫有机硅密封剂的研制 总被引:1,自引:0,他引:1
用液体端羟基聚二甲基硅氧烷、甲基含氢硅油、自制的氧化铈和复合有机钛化合物催化剂配制了室温硫化泡沫有机硅密封剂,探讨了密封剂的硫化发泡机理、生胶对硫化发泡的影响以及密封剂的闭孔和耐高低温性能等.结果表明所配制的密封剂耐高低温性好,闭孔率高、在高湿环境下质量变化少,经受250℃×500h和300℃×100h老化后,弹性较好. 相似文献
16.
17.
18.
During the service life of structural sealant glazing (SSG) facades, the load-bearing capacity of the silicone bonds needs to be guaranteed. Laboratory tests can assess the durability of SSG-systems based on mechanical characteristics of the bond after simultaneous exposure to both climatic and mechanical loads. This article studies how the material characteristics of two common structural sealants are affected by laboratory and field exposure. Dynamic mechanical analysis (DMA) confirms a reduction in the dynamic modulus of exposed silicone samples. Results from thermogravimetric analysis, Fourier-transform infrared spectroscopy, differential scanning calorimetry, and small-angle X-ray scattering/wide-angle X-ray scattering show differences between the two sealants and indicate no/minor changes in the composition and morphology of the laboratory and field exposed sealants. Mechanical characterization methods, such as DMA, and tensile and shear testing of the structural bond, are shown to be sensitive toward the combined climatic and mechanical loadings, and are hence suitable for studying degradation mechanisms of structural sealants. 相似文献
19.
20.
单组分硅氧烷改性聚氨酯密封胶的研制 总被引:1,自引:2,他引:1
为提高单组分聚氨酯(PU)密封胶的力学性能,以混合聚醚多元醇和甲苯二异氰酸酯(TDI-80)为原料,先制得预聚体,然后采用有机官能性硅烷(A-1100)对其进行封端,最后配以各种助剂和填料制得了单组分硅氧烷改性PU密封胶。探讨了二元醇与三元醇的比例、封端剂及增塑剂的用量对密封胶性能的影响。研究结果表明,当二元醇与三元醇的质量比为1∶1~3∶2、封端剂的用量为3%~12%和增塑剂的用量为20% ̄25%时,改性后的密封胶力学性能较佳。 相似文献