苯基硅橡胶纳米复合材料的性能研究

发布时间：2018-03-07 22:39

本文选题：LED封装　切入点：苯基硅橡胶合成　出处：《上海应用技术学院》2015年硕士论文　论文类型：学位论文

【摘要】：功率型发光二极管(LED)以其高功效、快速响应、节能、环保等优良特性而得到人们广泛地关注。而与普通LED相比较,大功率LED会产生更高的光强、从而发出更多的热及更强的短波辐射,而过高的温度会让发光二极管加速失效,极大地降低了器件的使用寿命。所以迫切需要封装材料具有保持可见光区高透明性的同时能够对紫外光有较高的吸收率,以防止紫外线的泄露,并应具有较强的耐紫外老化性能及高热导率。有机硅具有优异的耐候性、耐高低温性、化学稳定性等,并成为大功率LED封装的首要选择。然而,现有有机硅材料的光学性能及综合性能有待进一步提高,以满足大功率LED封装的需要。本文主要从两个方面展开了研究工作。首先,为提高有机硅橡胶的光学性能,设计制备了高苯基硅橡胶及高苯基含氢硅油,并固化出高折射率的有机硅橡胶。以原料苯基三甲氧基硅烷(PTMS)、二苯基二甲氧基硅烷(DPDS)、二甲基二甲氧基硅烷(MSDS)、六甲基二硅氧烷(MM)、乙烯基三甲氧基硅烷(VTMO)口反应工艺条件反应温度、反应时间和催化剂用量因素设计正交实验合成高苯基硅橡胶,实验研究表明,高苯基硅橡胶对粘度和折射率影响最大的反应配比为：PTMS:DPDS:MSDS:MM:VTMO=3:2:1.5:0.3:0.96(摩尔比),对所制得的硅橡胶具有较高的折射率(1.55)和粘度(18725/mPa·s)、以四甲基环四硅氧烷(D：)、甲基苯基硅氧烷环体(DMcPhn)、四甲基二硅氧烷(HMM)、反应时间和反应温度为因素设计正交实验合成高苯基含氢硅油,实验研究表明,高苯基含氢硅油对粘度影响最大的条件为：DH4：DMcOhn：HMM=6：4：0(摩尔比),对所制得的硅橡胶具有较高的折射率(1.52)和粘度(1052/mPa·s)、其次,为提高所制备有机硅橡胶的综合性能,采用具有不同功能的表面改性的纳米粒子TiO2、SiO2、ZrO2和AlNaO6Si2与不同苯基含量的硅橡胶制备了纳米复合材料,系统研究了纳米粒子的种类及含量对高苯基硅橡胶和中苯基硅橡胶纳米复合材料的机械性能、光学性能、介电性能、导热性能的影响。研究表明：纳米粒子经KH550偶联剂处理后,苯基硅橡胶纳米复合材料的拉伸强度呈现先增大后减小的趋势,当纳米Si02、Ti02和Zr02的含量为0.03wt%而A1Na06Si2含量为1wt%时,所制得的纳米复合材料具有较好的力学性能,分别为0.54MPa、059MPa、0.55MPa、0.54MPa。苯基硅橡胶纳米复合材料的折射率随着粒子添加量增加而增加,当纳米SiO2、TiO2、ZrO2和AlNaO6Si2含量为3wt%时,所制得的纳米复合材料具有较好的折射率,分别为1.587、1.573、1.571和1.566。在小添加量下(0.03wt%), AlNaO6Si2和纳米Si02对高苯基硅橡胶折射率的提高更明显,而对中苯基硅橡胶折射率起到平稳提高的作用。苯基硅橡胶纳米复合材料的介电常数随着随着粒子添加量增加而增加,且纳米Si02和AlNaO6Si2对中苯基含量硅橡胶影响要大于高苯基硅橡胶。苯基硅橡胶纳米复合材料的体积电阻率随着粒子的添加量增加而增加,当纳米SiO2、TiO2、ZrO2和AlNaO6Si2的含量为3wt%时,所制得的纳米复合材料具有最高的体积电阻率,添加纳米改性Zr02、Ti02的苯基硅橡胶复合材料的体积电阻率从2×1013Ω-cm分别增加到20×1013、40×1013Ω·2cm。而纳米改性AlNaO6Si2、Si02的复合材料体积电阻率从2×1013Ω-cm分别增加到5×1013、6×1013Ω·cm。苯基硅橡胶纳米复合材料的导热率呈现先增加后减小的趋势,当纳米ZrO2和AlNaO6Si2的含量为0.03wt%时而纳米Ti02、Si02的含量分别为0.6 wt%,1%时,所制得的纳米复合材料具有最佳的导热率,分别为0.306、0.436、0.339和0.464W.m-1.K-1。
[Abstract]:Power type light emitting diode (LED) with its high efficiency, fast response, energy saving, environmental protection and other excellent characteristics and get people's attention widely. Compared with ordinary LED, high power LED will produce a higher light intensity, thus make the shortwave radiation heat and more stronger, but too high temperature will make the light emitting diode accelerated failure, greatly reduce the service life of the device. So there is an urgent need to maintain and package materials with high visible light transparency to ultraviolet light has high absorption rate, to prevent the leakage of the UV, and should have strong ultraviolet aging resistance and high thermal conductivity. Silicone has excellent weatherability, high low temperature, chemical stability, and become the first choice for high power LED package. However, optical performance and comprehensive performance of the existing silicone materials needs to be further improved, to meet the needs of high power LED package . this article mainly from the two aspects of the research work. Firstly, in order to improve the optical properties of silicone rubber, preparation of high phenyl silicone rubber and phenyl hydrogen containing silicone oil, silicone rubber and curing a high refractive index material. With phenyltrimethoxysilane (PTMS), two two methoxy phenyl silane (DPDS), two methyl two methoxy silane (MSDS), six (MM), two methyl siloxane vinyl trimethoxysilane (VTMO) and reaction temperature, reaction time and catalyst dosage factors of orthogonal experimental design synthesis of phenyl silicone rubber. The experimental results show that the high rate of phenyl silicone rubber effects of composition on the viscosity and the maximum refraction was PTMS:DPDS:MSDS:MM:VTMO=3:2:1.5:0.3:0.96 (molar ratio), with high refraction of silicone rubber was prepared by the rate (1.55) and viscosity (18725/mPa - s), with four methyl siloxane ring four (D:), methyl phenyl silicone Siloxane ring (DMcPhn), two (HMM) four methyl siloxane, reaction temperature and reaction time for the synthesis of phenyl factors of orthogonal experimental design of silicone oil containing hydrogen, experimental results show that the high phenyl hydrogen containing silicone oil on the viscosity of the greatest impact conditions are as follows: DH4:DMcOhn:HMM=6:4:0 (molar ratio), with high refraction of silicone rubber prepared the rate (1.52) and viscosity (1052/mPa - s), secondly, in order to improve the overall performance of the preparation of silicone rubber, with different functions of surface modified nanoparticles TiO2, SiO2 nanocomposites were prepared by ZrO2 and AlNaO6Si2 with different content of phenyl silicone rubber system, studied the species and the content of nanoparticles of high mechanical properties, silicone rubber and silicone rubber nano composite material optical properties, dielectric properties, thermal conductivity effect. The study shows that nanoparticles by KH550 coupling agent, phenyl The tensile strength of silicone rubber nanocomposites increased first and then decreased, when the content of nano Si02, Ti02 and Zr02 for 0.03wt% and A1Na06Si2 content is 1wt%, the nano composite material with good mechanical properties, respectively 0.54MPa, 059MPa, 0.55MPa, 0.54MPa. index of phenyl silicone rubber nanocomposites the rate increases with the increase of nano particles, when SiO2, TiO2, ZrO2 and AlNaO6Si2 content is 3wt%, the nano composite material with good refractive index, respectively 1.587,1.573,1.571 and 1.566. in small amount (0.03wt%), AlNaO6Si2 and Si02 nanoparticles on phenyl silicone rubber to improve high refractive index more obviously, to improve the effect of smooth and in silicone rubber. The refractive index of phenyl silicone rubber nanocomposites with the dielectric constant increases with the increase of nano particles, and Si02 and AlNaO6Si2 The content of phenyl silicone rubber is greater than the impact of high phenyl silicone rubber. The volume resistivity of phenyl silicone rubber nanocomposites increased with the amount of particles increases, when the nano SiO2, TiO2, ZrO2 and AlNaO6Si2 content is 3wt%, the nano composite material with high volume resistivity, adding nano modified Zr02, volume resistivity of phenyl silicone rubber composite Ti02 from 2 * 1013 -cm were increased to 20 * 1013,40 * 1013. 2cm. and nano modified AlNaO6Si2, 2 * 1013 Omega -cm were increased to the thermal conductivity of 5 * 1013,6 * 1013. Cm. phenyl silicone rubber nanocomposites increased at first then decreases from the resistivity of Si02 composite material volume, when the content of nano ZrO2 and AlNaO6Si2 for 0.03wt% and Ti02 nanoparticles, the content of Si02 was 0.6 wt%, 1%, nano composites has the best thermal conductivity, respectively. 0.306,0.436,0.339 and 0.464W.m-1.K-1.

【学位授予单位】：上海应用技术学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ333.93;TB33

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