硅橡胶泡沫/HGB复合材料的制备及性能

采用室温硫化法制备了一系列不同空心玻璃微珠（HGB）用量的硅橡胶泡沫（SF）/HGB复合材料,并研究了HGB用量对SF/HGB复合材料的交联密度、泡孔结构、机械性能、动态力学性能的影响。结果表明：HGB用量为6%时对应的SF/HGB6复合材料具有最佳的综合性能。通过静态压缩试验考察了SF/HGB6复合材料的缓冲性能,其缓冲系数与聚乙烯泡沫（EPE）非常接近。动态压缩疲劳试验结果表明,SF/HGB6复合材料具有较长的疲劳寿命（600万次）和较高的高度保持率（98.4%）,远高于EPE（29万次,54.5%）,并且SF/HGB6复合材料的缓冲系数在疲劳试验前后几乎没有变化,明显优于传统的缓冲材料EPE,可作为包装领域的缓冲材料。     

隔热填料对硅橡胶性能的影响

以甲基乙烯基硅橡胶为基体(MVQ),二氧化硅气凝胶(Aerogels)、云母粉(Mica)和空心玻璃微珠(HGB)为隔热填料,制备了MVQ/Aerogels、MVQ/Mica、MVQ/HGB 3种硅橡胶复合材料,并研究了隔热填料对硅橡胶性能的影响。结果表明,复合材料的隔热效果为MVQ-Mica相似文献   

复合型反射隔热涂料的制备与性能研究

采用红外高反射率的空心玻璃珠(BLZ)和彩色空心陶瓷珠(TCZ)制备得到复合型建筑反射隔热涂料,研究了功能性填料、乳液、颜填料及颜填料粒径配比对涂料隔热效果及耐沾污性能的影响。试验结果表明,成膜物质种类的差异对涂料隔热性能的影响较小,当纯丙乳液含量为40%时,隔热温差为14.6℃;二氧化钛能有效提高涂层反射隔热性能,采用20%的二氧化钛添加量能使隔热温差达到15℃左右;填料含量为12%时,具有良好的隔热增强效果,隔热温差为14.6℃;当m(BLZ)/m(TCZ)=1:1时,涂层隔热温差为16.5℃;耐沾污测试表明,当采用纯丙乳液,钛白、硅藻土和滑石粉比例为5:1:1,m(BLZ)/m(TCZ)=2:1时,具有良好的耐沾污性能。     

轻质环氧复合材料的制备与性能研究

制备了一种以空心玻璃微珠为填充材料的轻质环氧复合材料,确定了材料的固化工艺,并对不同型号的空心玻璃微珠进行了筛选.研究了玻璃微珠填充量对材料密度及力学性能的影响.研究发现,复合材料的密度随空心玻璃微珠填充量的加大呈现先降低后略有升高的趋势;拉伸强度和压缩强度均随填充量的增加而减小;拉伸弹性模量和压缩弹性模量随着填充量提...     

硅橡胶泡沫/空心玻璃微珠复合材料的制备及性能

以α,ω-二羟基聚二甲基硅氧烷、α,ω-二乙烯基聚二甲基硅氧烷、含氢硅油、空心玻璃微珠(HGB)为原料,采用室温硫化法制备了一系列不同HGB用量的硅橡胶泡沫(SF)/HGB复合材料,并研究了HGB用量对SF/HGB复合材料的交联密度、泡孔结构、机械性能、动态力学性能的影响。结果表明:HGB质量分数为6.0%时制备的SF/HGB6复合材料具有最佳的综合性能。并考察了SF/HGB6复合材料的静态缓冲性能和动态疲劳性能。结果表明:SF/HGB6复合材料的缓冲系数与聚乙烯泡沫(EPE)非常接近;该复合材料具有较长的疲劳寿命(600万次)和较高的高度保持率(98.4%),远高于EPE(29万次,54.5%);并且SF/HGB6复合材料的缓冲系数在疲劳实验前后几乎没有变化,明显优于传统的缓冲材料EPE,可作为包装领域的缓冲材料。     

膨胀珍珠岩及气相二氧化硅填充硅橡胶复合材料的制备与隔热性能

研究珍珠岩基新型复合保温材料是开拓矿物材料应用领域的新课题。本工作研究了2种不同尺寸珍珠岩以及气相二氧化硅作为复合填料，分别以捏合工艺和直接混合工艺填充于乙烯基硅油或室温硫化硅橡胶，制备珍珠岩填充的复合硅橡胶保温板，通过检测不同产物的导热系数以及保温效果来评价其性能。结果表明：以捏合工艺制备的产品会降低珍珠岩的保温效果，主要原因是中空颗粒被捏合过程破碎；而以气相二氧化硅为主要填料制备的保温板不易成型，可成型产品最低导热系数为0.172 8 W·m^?1·K^?1；当以珍珠岩+气硅粉在硅橡胶中的质量比为37.5%时，产品导热系数为0.034 9 W·m^?1·K^?1，产物厚度为2.5 cm、250℃单侧加热4 min后，背面温度为67℃，基本满足在新型烟具等特种保温隔热应用要求。     

空心玻璃微珠／聚四氟乙烯复合材料的性能研究

采用共混方法制备了空心玻璃微珠/聚四氟乙烯复合材料.研究了复合材料的密度、吸水性、压缩强度、冲击强度、邵氏硬度、隔热性能,并借助SEM探讨了冲击断面的微观形态结构,对各影响因素进行了分析.结果表明:加入适量的玻璃微珠可以提高复合材料的隔热性能,降低复合材料的密度;由于空心玻璃微珠强度低及界面缺陷的存在,复合材料的机械性能下降,但在加入少量空心玻璃微珠时,模压过程中产生的玻璃碎片提高了复合材料的压缩强度.     

建筑反射隔热涂料的制备及性能研究

采用亲水性的弹性乳液为基料,以优异隔热、反射功能的空心玻璃微珠、陶瓷微珠和反光粉为功能填料,研制开发了一种集反射型隔热、辐射型隔热、阻隔型隔热为一体的高耐沾污的反射隔热弹性涂料.测试结果表明太阳光反射比为O.84,半球发射率为0.88,隔热温差高达15.3℃,耐沾污性为12.5％拉伸强度为1.3MPa.研制的涂料隔热效果明显,具有抗沾污性强,拉伸强度高、耐候性好等优异性能.     

乙烯基树脂/空心玻璃微珠复合材料的制备及性能

将空心玻璃微珠（HGMS）掺入乙烯基树脂中,通过模压技术制备了玻璃纤维增强乙烯基树脂/空心玻璃微珠（GF/VER/HGMS）复合材料,并比较单一填料和混掺填料对复合材料性能的影响。结果表明：复合材料弯曲性能随着HGMS的含量增加而下降。当HGMS的含量为20 g,GF/VER/20HGMS的力学性能较好,抗弯强度和邵氏硬度分别为124.6 MPa和91.2,腐蚀后性能下降6.43%和2.63%。混掺双飞粉（GCC）后的复合材料性能优于填充单一填料的复合材料。HGMS含量越高,复合材料的耐热性越好,残炭率最高可达74.3%。过量的HGMS使树脂糊黏度增加,不利于填料在树脂中均匀分散,并出现大量团聚、破碎现象,导致复合材料的抗破坏能力减弱。     

隔热功能填料对隔热涂料性能的影响

以空心玻璃微珠、纳米ATO粉和陶瓷微珠作为隔热功能填料,通过探究其对隔热涂料性能的影响,最终制备出综合性能优良的隔热涂料。     

短切碳纤维及碳纤维布增强硅橡胶复合材料的制备及力学性能

将短切碳纤维(CF)、白炭黑和甲基乙烯基硅橡胶(VMQ)共混后,与碳纤维布(CFC)复合制备VMQ复合材料.考察了CFC层数对复合材料的拉伸性能、邵尔A硬度、耐磨性能及动态力学性能的影响.结果表明,随着CFC层数的增加,复合材料的扯断伸长率基本不变,拉伸强度逐渐升高.与仅添加10份(质量,下同)CF的复合材料相比,加入...     

玄武岩短纤维增强硅橡胶复合材料的制备及性能

采用玄武岩短纤维(BF)增强硅橡胶,制备了BF/硅橡胶复合材料,考察了硅烷偶联剂的种类、BF用量以及硫化条件对复合材料力学性能的影响,并用扫描电子显微镜观察了复合材料的微观形貌。结果表明,用KH 550对BF进行表面处理,所得复合材料的力学性能优于以Si 69处理的材料;当BF用量为20份时,BF/硅橡胶复合材料的力学性能最好;制备复合材料的最佳硫化条件为10 MPa×175℃×25 min;用KH 550处理BF,BF与硅橡胶的相容性比用Si 69处理的好。     

Preparation and heat resistance of hollow glass microbead/silicone rubber composite coating

Hollow glass microbead/silicone rubber composite coatings were prepared to improve the heat-resistance and mechanical properties of silicone rubber-based composites, using CE modified SR as the matrix and HGM as the filler. The microscopic morphology and thermal stability of the composites were characterized by scanning electron microscopy (SEM) and thermogravimetric analyzer (TGA), respectively. The results showed that the thermal stability of the composites increases with the increase of filler content. For the composite sample with a HGM mass content of 16.7%, the initial decomposition temperature (T₅) is 408°C, which is 84°C higher than that of silicone rubber. The low density and high sphericity of HGM make it easier to uniformly disperse in the polymer matrix. In addition, compared to silica, which is commonly used as an inorganic filler, the lower thermal conductivity of HGM is also beneficial for achieving better thermal shielding effect. It is confirmed that the insufficient thermal stability of the polymer matrix above 400°C can be compensated for by the properly dispersed inorganic fillers. Therefore, the thermal stability of the composite is improved by the synergistic effect of modified heat-resistant matrix and inorganic filler.     

Improving the transient thermal response and ablation properties of epoxy-modified silicone rubber composites by adding fluxing agent

In this work, transient thermal response and ablation behavior of liquid silicone rubber composites containing fluxing/ceramic forming fillers were investigated under different heat flows using an oxyacetylene flame. The results indicated that the introduction of zinc borate (ZB) and aluminum oxide (Al₂O₃) effectively reduced the temperature at various depths of the samples, and they improved the thermal insulation properties and lowered pyrolysis rates. The above finding was attributed to the heat absorption arising from water release and melt filling as well as the vitrified reaction of solid melt due to the decomposition of ZB. Besides, the melting and exfoliation of Al₂O₃ and the formation of aluminum silicate (Al₂SiO₅) caused heat absorption effect. Additionally, the mass ablation rates and line ablation rates increased with rising heat flows coupling with a decrease of compressive strength of the char layers. In a nutshell, the effect of adding ZB/Al₂O₃ on the thermal insulation behavior of epoxy-modified vinyl silicone rubber (EMVSR) composites under different heat flows was elucidtaed. This work served as a reference for the design and preparation of flexible ablative materials for thermal protection applications.     

液体聚异戊二烯/天然橡胶复合材料的制备与性能

制备了4种3,4-结构摩尔分数不同的液体聚异戊二烯(LIR),考察了芳烃油及不同3,4-结构摩尔分数的LIR作为增塑剂对于天然橡胶(NR)的交联密度、物理机械性能、动态力学性能及微观结构的影响.结果表明,随着LIR中3,4-结构摩尔分数的增加,NR的交联密度增加.LIR不仅起到增塑的作用,还可与NR形成共交联网络.与芳...     

高密度聚乙烯/硅橡胶热塑性硫化胶的制备与性能

采用动态硫化法制备了高密度聚乙烯（HDPE）/硅橡胶（MVQ）热塑性硫化胶（TPV）,考察了HDPE与MVQ的质量比及压片工艺对TPV的硫化特性、力学性能及表面亲疏水性能的影响。结果表明,随着MVQ用量的增加,TPV的动态硫化程度逐渐升高。随着压片时间的延长,TPV的拉伸强度、撕裂强度和扯断伸长率均大幅提高。随着MVQ用量的增加,TPV与水的接触角逐渐增加,相应的表面张力逐渐减小。     

Adhesion properties and thermal degradation of silicone rubber

Silicone rubber is suitable for the thermal insulator of the rocket motors owing to its heat resisting properties as well as its excellent elasticity and restoring force. However, the adhesion properties of the silicone rubber should be improved greatly to be used as the thermal insulator because of its poor adhesiveness coming from the low surface tension. Functional groups were incorporated through copolymerization to the silicone rubber to induce chemical reaction with the functional groups in the propellant/liner components to enhance the adhesion properties. Peeling tests results disclosed that the incorporation of amine groups was the most efficient for the adhesiveness enhancement and that addition of carbon black improved the adhesiveness still more. Stability against thermal degradation of the silicone rubber was examined by measuring the activation energy through the thermogravimetric analysis. The results revealed that the compounding of the Cloisite® clays boosted up the thermal stability of the silicone rubber much more greatly than that of carbon black. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 2782–2787, 2007     

镀银铝粉填充型电磁屏蔽硅橡胶的制备与性能

研究了镀银铝粉填充量和环境试验对电磁屏蔽硅橡胶电学和力学性能的影响。结果发现,镀银铝粉填充量为210份(质量)是电磁屏蔽硅橡胶的逾渗阈值;最佳的镀银铝粉填充量为230份(质量),此时电磁屏蔽硅橡胶的体积电阻率为6.75×10-3Ω.cm,拉伸强度为2.3MPa,扯断伸长率为571%,邵尔A硬度为65;镀银铝粉填充型电磁屏蔽硅橡胶具有较好的耐高低温和热空气老化性能,而耐盐雾性能较差。     

一种水性隔热涂料的研制

水性隔热保温涂料属于新一代的功能型涂料,广泛应用于外墙保温。本文以苯丙乳液为基料,在颜填料中引入真空玻璃微珠,对比了不同隔热填料及玻璃微珠加入量对隔热效果的影响,制备了一种环保型隔热涂料,该涂料涂于物体表面可降低其内部环境温度,达到节能降耗的目的。