共查询到19条相似文献,搜索用时 91 毫秒
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有机硅-环氧树脂兼具有机硅和环氧树脂的优点,广泛用于环氧树脂改性剂、有机硅增粘剂和LED封装基体树脂。以端氢基苯基硅油(HTPS)与3,4-环氧环己基甲基甲基丙烯酸酯(ECMA)为原料,采用硅氢加成法合成了有机硅-环氧树脂(PSER)。探索了PSER的合成反应条件,用红外光谱表征了其结构,并将PSER固化后应用于5050和2835贴片灯珠。结果表明,向ECMA和铂金催化剂混合物中滴加HTPS,在反应温度50℃、反应时间5 h、ECMA中CC与HTPS中Si—H键的摩尔比为1∶1时,得到的PSER树脂无色透明,储存稳定,折射率达1.535;经过3次回流焊,死灯率为0%,适合作为LED封装基体树脂。 相似文献
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<正>常州市源恩合成材料有限公司与江苏工业学院联合开发成功LED封装用有机硅树脂。该树脂系甲基氯硅烷的衍生产品,将其用于大功率LED封装中,具有质量稳定 相似文献
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考察了乙炔改性聚硅氧烷乳液消泡剂对中性墨水表面张力、密度、黏度、pH和书写性能的影响。结果表明,消泡剂的加入,使中性墨水表面张力小幅下降,对中性墨水黏度、pH没有显著影响,当消泡剂的质量分数为0.042%~0.043%时,消泡效果最佳,书写线条光滑饱满,出墨均匀性得到改善。 相似文献
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A nanocomposite energetic material was prepared using sol‐gel processing. It was incorporated into the nano or submicrometer‐sized pores of the gel skeleton with a content up to 95 %. AP, RDX, and silica were chosen as the energetic crystal and gel skeleton, respectively. The structure and its properties were characterized by SEM, BET methods, XRD, TG/DSC, and impact sensitivity measurements. The structure of the AP/RDX/SiO2 cryogel is of micrometer scale powder with numerous pores of nanometer scale and the mean crystal size of AP and RDX is approx. 200 nm. The specific surface area of the AP/RDX/SiO2 cryogel is 36.6 m2 g−1. TG/DSC analyses indicate that SiO2 cryogel can boost the decomposition of AP and enhance the interaction between AP and RDX. By comparison of the decomposition heats of AP/RDX/SiO2 at different mass ratios, the optimal mass ratio was estimated to be 6.5/10/1 with a maximum decomposition heat of 2160.8 J g−1. According to impact sensitivity tests, the sensitivity of the AP/RDX/SiO2 cryogel is lower than that of the pure energetic ingredients and their mixture. 相似文献
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章坚 《精细与专用化学品》2009,17(8):15-17
前言
灌封简单说就是把构成电子元器件的各部分按要求进行合理的布置、组装、键合、连接与环境隔离和保护等操作工艺。它的作用是强化电子器件的整体性,提高对外来冲击、震动的抵抗力;提高内部元件、线路间的绝缘;有利于器件小型化、轻量化;避免元件、线路直接暴露于环境中,改善器件的防水、防潮性能。灌封材料的品种很多,常用的主要有三大类:环氧树脂,有机硅和聚氨酯。 相似文献