加工方式对白炭黑补强硅弹性体影响

本文探索了沉淀法白炭黑填充有机硅弹性体的加工方式。结果发现，沉淀法T36白炭黑加工时存在轻微结构化现象；在分次加入润湿剂、二次热处理后，硅弹性体强度可达8MPa，比常规加工方式提高约2MPa。     

加工方式对白炭黑补强硅弹性体影响

本文探索了沉淀法白炭黑填充有机硅弹性体的加工方式。结果发现，沉淀法T36白炭黑加工时存在轻微结构化现象；在分次加入润湿剂、二次热处理后，硅弹性体强度可达8MPa，比常规加工方式提高约2MPa。     

轮胎和橡胶制品用易分散沉淀法白炭黑Hi－SilEZ

轮胎和橡胶制品用易分散沉淀法白炭黑Ｈｉ－ＳｉｌＥＺ美国《橡胶化学和工艺》１９９５年６８卷４期７０１页报道：Ｈｉ－Ｓｔ严卫Ｚ是一种已实现工业化生产的易分散沉淀法白炭黑，它可用作通用弹性体的补强材料。介绍了这种白炭黑的物理性能以及它在填充白炭黑的典型轿车...     

橡胶用沉淀法白炭黑的现状与发展趋势

介绍橡胶用沉淀法白炭黑的现状和发展趋势。沉淀法白炭黑聚集结构的控制方式有添加表面活性剂、用合适的酸作沉淀剂、二次法沉淀和减少白炭黑表面羟基等。沉淀法白炭黑分散性的测试方法有光学显微镜法和粒径分布测定法。轮胎用白炭黑主要为易分散性白炭黑和高分散性白炭黑。白炭黑产业未来的发展方向是淘汰落后产能,开发补强性和分散性更好的新品种,尤其是能显著降低轮胎滚动阻力的高分散性沉淀法白炭黑。     

高分散性沉淀法白炭黑在轮胎中的应用研究

利用沉淀法白炭黑与溶液聚合物和偶联剂配合,配方设计人员在成功地降低了轮胎胎面滚动阻力的同时提高了湿路面牵引性。用高分散性白炭黑替代普通白炭黑能改善胶料的加工性能和提高耐磨性能。仍有必要进一步降低滚动阻力,而使用沉淀法白炭黑是方法之一。含沉淀法白炭黑尤其是高分散性白炭黑的胶料降低了轮胎的滚动阻力和提高了轮胎多个部位的其它性能。我们认为,使用沉淀法白炭黑不仅有助于轿车轮胎,而且有助于其它轮胎产品达到新的低滚动阻力要求。     

大连新绿州化学开发出改性沉淀法白炭黑制备新方法

<正>大连新绿州化学工业有限公司开发出一种改性沉淀法白炭黑制备新方法,其中改性沉淀法白炭黑由沉淀法白炭黑、改性剂和偶联剂混合而成,按重量份数计:沉淀法白炭黑:改性剂:偶联剂=100:0.6~4.0:0.5-~3.0。与以往的沉淀法白炭黑改性方式相比,该方法采用干混改性,不需要使用任何溶剂,只需要将沉淀法白炭黑、改性剂和偶联剂充分混合均匀,处理工艺简单,不产生污染,不产生三废(废水、废气、废渣),是绿色环保产品。     

氯化聚乙烯CM135B与CPE135A共混弹性材料的研究

制备了一种由橡胶型氯化聚乙烯(CM135B)和树脂型氯化聚乙烯(CPE135A)共混的弹性体材料,并对其各项性能进行了测试。研究了不同CM/CPE质量比、硫化剂用量、白炭黑用量以及增塑剂用量对CM/CPE共混弹性体性能的影响。结果表明,当CM/CPE质量比为50/50、DCP与三烯丙基异氰脲酸酯(TAIC)用量分别为5份和4份、白炭黑用量为50份、DOP用量为20份时,CM/CPE共混弹性体的物理机械性能优异,其中拉伸强度为15.3 MPa,断裂伸长率为275%,100%定伸应力为5.9MPa,邵尔A硬度为82;体系的耐油性能、耐臭氧性能、加工性能在此时也均表现优异,且CM/CPE共混弹性体损耗模量随剪切速率增大而减小,但当达到300r/min时趋于稳定,温度在80℃、应变为120%左右时可获得理想的加工性能。     

扫描电子显微镜在沉淀法白炭黑研究中的 应用现状与展望

介绍扫描电子显微镜(简称扫描电镜)的特点和测试原理及其在沉淀法白炭黑研究中的应用。与透射电子显微镜相比,扫描电镜可以获得更准确的沉淀法白炭黑微观结构,且价格适中,易于操作,结果分析简单。扫描电镜用于沉淀法白炭黑制备研究中可以获得沉淀法白炭黑粒子大小、团聚体形貌和孔结构等微观结构信息,用于沉淀法白炭黑改性研究中可以观测改性效果,用于沉淀法白炭黑/橡胶复合材料研究中可以表征沉淀法白炭黑在复合材料中的分散程度。     

传统沉淀法制白炭黑的研究进展

综述了传统沉淀法制备二氧化硅粒子（白炭黑）的过程，以及影响白炭黑颗粒大小的因素，包括表面活性剂和分散剂、沉淀剂及沉淀方式等的影响。指出此种方法制备的白炭黑并不具有科学意义上的纳米实质，同时指出传统沉淀法制备白炭黑的研究重点应侧重于改进其分散性能。     

新型白炭黑在橡胶工业中的应用

介绍了新型沉淀法白炭黑在橡胶工业中的应用情况，如绿色轮胎用高分散白炭黑，高吸油性沉淀法白炭黑，低比表面沉淀法白炭黑，硅橡胶专用沉淀法白炭黑的优点及应用情况，指出了白炭黑工业今后的发展方向。     

The effect of fumed silica upon the reaction of iron octoate and polysiloxanes

Silica is a common component in silicone elastomer formulation. Silica is known to have surface hydroxyl groups and the reactions and interactions of these surface groups with various materials have been studied extensively in the past. It is believed that the iron octoate used to combat oxidative embrittlement in silicone elastomer formulations may also react with the surface of silica, specifically fumed silica. Dynamic mechanical spectroscopy (DMS), Fourier Transform Infrared Spectroscopy (FT-IR), Electron Scanning for Chemical Analysis (ESCA), and Gel Permeation Chromatogrphy (GPC) were used to study the influence of untreated fumed silica and silica treated with dimethylsiloxane species on the iron octoate reaction. The rate of reaction was studied as a function of loading of silica. From analyzing rates of backbone scission and salt consumption, it is found that the iron octoate reacts preferentially with the surface of untreated fumed silica. Conversely, iron octoate appears to have no preferential reaction with the surface of the treated fumed silica.     

有机硅/二氧化钛复合材料的制备及抗紫外线性能分析

在有机硅弹性体中添加二氧化钛,通过不同的混合比例,在150 ℃下采用压模工艺制备厚度为0.8 mm的有机硅/二氧化钛复合材料。性能测试结果表明,有机硅/二氧化钛复合材料具有很高的防紫外线效果,但弹性强力和模量降低。复合材料的防紫外线效果和弹性性能与有机硅弹性体在乳液中的含量有关。     

动态硫化聚氨酯/硅橡胶热塑性弹性体研究进展

从原料选择、加工工艺和增容剂方面总结了动态硫化聚氨酯/硅橡胶热塑性弹性体的研究进展。     

Silicone rubbers for dielectric elastomers with improved dielectric and mechanical properties as a result of substituting silica with titanium dioxide

One prominent method of modifying the properties of dielectric elastomers (DEs) is by adding suitable metal oxide fillers. However, almost all commercially available silicone elastomers are already heavily filled with silica to reinforce the otherwise rather weak silicone network and the resulting metal oxide filled elastomer may contain too much filler. We therefore explore the replacement of silica with titanium dioxide to ensure a relatively low concentration of filler. Liquid silicone rubber (LSR) has relatively low viscosity, which is favorable for loading inorganic fillers. In the present study, four commercial LSRs with varying loadings of silica and one benchmark room-temperature vulcanizable rubber (RTV) were investigated. The resulting elastomers were evaluated with respect to their dielectric permittivity, tear and tensile strengths, electrical breakdown, thermal stability and dynamic viscosity. Filled silicone elastomers with high loadings of nano-sized titanium dioxide (TiO₂) particles were also studied. The best overall performing formulation had 35 wt.% TiO₂ nanoparticles in the POWERSIL® XLR LSR, where the excellent ensemble of relative dielectric permittivity of 4.9 at 0.1 Hz, breakdown strength of 160 V µm^?1, tear strength of 5.3 MPa, elongation at break of 190%, a Young’s modulus of 0.85 MPa and a 10% strain response (simple tension) in a 50 V μm^?1 electric field was obtained.     

混炼型PU/硅橡胶共混物性能的研究

采用机械共混的方法，研究了混炼型PU同硅橡胶按不同比例共混后的物理机械性能及耐热性能。结果表明，在混炼型聚氨酯中加入少量硅橡胶，可提高聚氨酯橡胶的拉伸强度及拉断伸长率，并能显著改善聚氨酯橡胶的耐热性。     

硅烷偶联剂在气相白炭黑表面处理中的应用研究

本文考察了几种不同硅烷偶联剂对气相白炭黑的表面处理效果.对处理前后的气相白炭黑作了FT-IR分析,并用正交试验法考察了处理剂类型、处理时间及处理温度对产品疏水性的影响.结果表明,用18％的HMDS作处理剂,将气相白炭黑在90℃条件下处理4h,所得的疏水性气相白炭黑能很好改善RTV-2硅橡胶的工艺性能和力学性能;另外,采用胶料中直接混合的方式HMDS也能有效改善胶料工艺性能.     

Lead magnesium niobate-filled silicone dielectric elastomer with large actuated strain

A silicone dielectric elastomer filled with lead magnesium niobate with a maximum actuated strain of 7.4% at 45 kV/mm was fabricated by optimizing the amount of dielectric filler, amount of plasticizing agent, and crosslink density of the elastomer. The actuated strain of dielectric elastomers (DEs) is determined by both the dielectric constant and the elastic modulus. Although the dielectric constant of the silicone elastomer increased with increasing loading amount of lead magnesium niobate, actuated strain did not increase as expected because the elastic modulus increased at the same time. The elastic modulus of silicone dielectric elastomer was decreased by reducing the crosslink density or adding plasticizing agent, leading to a visible increase in actuated strain. It was also revealed that actuated strain of silicone dielectric elastomer always goes up with increasing ratio of dielectric constant to elastic modulus. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

Improving Properties of Dynamic Vulcanized Polyurethane and Silicone Rubber Elastomer through Controlling Interphase Layer

In this work, a new kind of compatibilizer was prepared through the reaction between hyperbranched polyurethane and isocyanate-modified silicone oil and its application in the dynamic vulcanized polyurethane and silicone rubber elastomer was investigated. Compared with that of dynamic vulcanized thermoplastic polyurethane (TPU)/silicone rubber elastomer without compatibilizer, the introduction of 3% silicone-modified hyperbranched polyurethane lead to the increase in tensile strength from 8.1 to 13.9?MPa and the tear strength from 56.2 to 75.2 kN/m. The introduction of silicone-modified hyperbranched polyurethane as an interphase layer controller leads to the improvement in properties of TPU/silicone rubber elastomer.     

医用高透明高强度液体注射成型硅橡胶(LIMS)的制备与研究

以D4(DMC),乙烯基双封头,乙烯基环体,六甲基二硅氧烷等为原料,四甲基氢氧化铵为催化剂合成了摩尔质量和乙烯基含量不同的乙烯基硅油;以高含氢硅油,含氢双封头,D4合成实验所需的含氢硅油;以白碳黑为填料通过密炼等工序制备了医用高透明液体注射硅橡胶。结果表明要制备高透明度的医用液体硅胶需要大于300m2/g气相白碳黑为填料。用干法处理比湿法处理白碳黑效果好且符合FDA等医用要求,当铂金用量为20～25ppm,抑制剂用量为0.10～0.16%时,能够满足液体注射成型硅橡胶的加工性能和成型周期性。     

Property reinforcement of silicone dielectric elastomers filled with self‐prepared calcium copper titanate particles

In this article, submicron and micron calcium copper titanate (CCTO) crystallites with different morphologies were successfully designed and prepared by directly thermal treatment method and molten salt method, respectively. Then, the silicone elastomer filled with self‐prepared CCTO particles had high dieletric constant, low dielectric loss, and actuated strain which was greatly improved at low electric field. The dieletric constant at 50 Hz obviously increased from 2.15 for pure silicone elastomer to 4.37 and 4.18 for the submicron and micron CCTO/poly (dimethyl siloxane) (PDMS) composites. The dielectric loss of the composites retained at a low value (less than 0.06). Meanwhile, the elastic modulus of CCTO/PDMS composites was increased slightly only with a good flexibility. Compared to pure silicone elastomer (2.25%), the submicron and micron CCTO/PDMS composites with 2 wt % content exhibited a greater strain of 7.69% and 9.83% at a low electric field of 5 V/μm. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 42613.