共查询到20条相似文献,搜索用时 109 毫秒
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介绍了防霉性、耐浸水及耐粘接性、低臭味性、无毒性脱酸型单组分室温硫化硅橡胶密封剂的配制,以及改进脱醋酸型单组分RTV硅橡胶密封粘接性的方法。 相似文献
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室温硫化水性硅橡胶粘接性研究 总被引:4,自引:0,他引:4
为了使水性硅橡胶具有实用价值,本文采用定性测试的方法,较系统地对有机锡催化体系室温硫化(RTV)水性硅橡胶粘接性进行了研究。结果表明,水性硅橡胶的粘接性随体系pH值的升高而提高;在一定范围内,水性硅橡胶的粘接性随催化剂用量或交联剂用量的减少而得到改善;加入适当的增黏剂、羟基稳定剂、或使用潜伏性活性基团的底涂剂都有助于改善水性硅橡胶的粘接性。 相似文献
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室温硫化硅橡胶胶粘剂的增强方法 总被引:6,自引:0,他引:6
通过硅橡胶丙烯酸(酯)改性、自制偶联剂、选择活性高分子材料、改善填料在胶粘剂中的分散性等方法,较好地提高了双组份室温硫化硅橡胶的粘接强度。 相似文献
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北京航空材料研究院研制出一种耐高温热固化橡胶胶粘剂。该研究采用向硅橡胶中加入乙烯基三特丁基过氧化硅烷和金属氧化物等混合配成胶粘剂 ,这种方法可提高胶粘剂的粘接强度和耐热性能 ,解决了硅橡胶和金属的粘接技术困难 ,粘接件在室温下的粘接扯离强度达 2 .5MPa以上 ,在30 0℃下的粘接扯离强度达 0 .83~ 1.4 5MPa ,最高使用温度可达 35 0℃。该胶的研制成功 ,拓宽了硅橡胶及其胶粘剂的应用范围。耐高温热固化硅橡胶胶粘剂 相似文献
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耐350℃有机硅胶粘剂 总被引:1,自引:0,他引:1
北京航空材料研究院研制了一种双组分室温硫化有机硅胶粘剂,工作温度为-60~350℃,颜色为红色或白色,固含量为100%,活性期为1~8h,可以粘接钢、铝、铜、钛合金等金属,也可以粘接硅橡胶和金属,对某些极性高分子材料也可以实现有效粘接。例如粘接硅橡胶和金属,250℃老化200h后室温粘接强度超过2.0MPa,250℃时的粘接强度超过1.0MPa;粘接金 相似文献
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北京航空材料研究院研制了一种双组分室温硫化有机硅胶粘剂,工作温度为-60~350℃,颜色为红色或白色,固含量为100%,活性期为1~8h,可以粘接钢、铝、铜、钛合金等金属,也可以粘接硅橡胶和金属,对某些极性高分子材料也可以实现有效粘接。例如粘接硅橡胶和金属,250℃老化200h后室温粘接强度超过2.0MPa,250℃时的粘接强度超过1.0MPa;粘接金 相似文献
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用于光学零部件粘接固定及密封的有机硅胶粘剂 总被引:1,自引:0,他引:1
本文概述了用于光学零部件粘接固定及密封的有机硅胶粘剂,其中包括有机硅树脂胶粘剂、加成型有机硅淋胶在光学零部件粘接固定方面的应用,以及室温硫化硅橡胶密封胶、非硫化硅橡胶密封腻子在产品密封方面的应用。 相似文献
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在环氧胶黏剂体系中,中温潜伏性固化剂以其优异的潜伏性和相对较低的固化温度而成为研究热点,符合当下提倡的绿色、环保、"低碳生活"理念。详细介绍了双氰胺、咪唑、酸酐、有机酰肼、BF3-胺络合物、微胶囊六种中温潜伏性固化剂及其改性方法。它们的改性方法主要是:通过改性活化或者加入活性促进剂降低双氰胺、酸酐、有机酰肼等高温固化剂的固化温度;通过改性钝化咪唑的固化活性,延长室温储存期;将BF3等路易斯酸室温固化的固化剂与胺络合降低其固化活性,提高室温储存期;将活性固化剂用壁材包裹形成微胶囊使其在室温时稳定,较高的温度时壁材破裂释放出活性固化剂,迅速固化。 相似文献
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The fracture surface energies of 5 polycrystalline silicon carbides were measured at room temperature using the double-cantilever-beam, notched-beam, and work-of-fracture methods. All methods yielded comparable fracture surface energies, 相似文献
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The antioxidant activities of the ethanolic extracts of propolis obtained by different extraction methods (high hydrostatic pressure extraction, leaching at room temperature and heat reflux extraction) were investigated in relationship to their total polyphenol and flavonoid contents by two different assays, namely, the β‐carotene bleaching and 1,1‐diphenyl‐2‐picrylhydrazyl (DPPH) free radical scavenging assay systems. The results showed that the ethanolic extracts of propolis obtained by high hydrostatic pressure extraction and leaching at room temperature had relatively strong antioxidant activities, which may be correlated with the total polyphenol and flavonoid contents. Antioxidant activities of ethanolic extracts of propolis obtained by high hydrostatic pressure extraction were the same as those of ethanolic extracts of propolis obtained by leaching at room temperature. Leaching at room temperature usually needs a few days, and can take even more than 7 d, while high hydrostatic pressure extraction needs only 1 min. These findings further illustrate that the high hydrostatic pressure extraction has a bright prospect for extracting flavonoids from propolis. 相似文献
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Li2MoO4‐based composite ceramics fabricated from temperature‐ and atmosphere‐sensitive MnZn ferrite at room temperature
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Maria Väätäjä Hanna Kähäri Jari Juuti Heli Jantunen 《Journal of the American Ceramic Society》2017,100(8):3626-3635
The first magnetic ceramic composites manufactured, using the room‐temperature densification method are reported. The samples were prepared at room temperature using Li2MoO4 as a matrix and MnZn ferrite with loading levels of 10‐30 vol‐% followed by postprocessing at 120°C. The method utilizes the water solubility of the dielectric Li2MoO4 and compression pressure instead of high temperatures typical of conventional solid‐state sintering. Hence, composite manufacturing using temperature‐ and atmosphere‐sensitive materials is possible without special conditions. This was demonstrated with MnZn ferrite, which is prone to oxidation when heat treated in air. Samples manufactured with room‐temperature densification showed no signs of reactivity during processing, whereas reference samples sintered at 685°C suffered from oxidation and formation of an additional reaction phase. The densities achieved with different loading levels of MnZn ferrite with both methods were very similar. Measurements up to 1 GHz showed relatively high values of relative permittivity (21.7 at 1 GHz) and permeability (2.6 at 1 GHz) with 30 vol‐% loading of MnZn ferrite in the samples manufactured by room‐temperature densification. In addition, pre‐granulation is proposed to improve the processability of the composite powders in room‐temperature densification. 相似文献