剪切技术在沉淀白炭黑分散细化中的应用研究

介绍了利用最新的剪切技术在沉淀白炭黑分散细化工艺过程中的原理和方法,通过响应面实验对沉淀白炭黑进行了分散细化实验研究,实验表明剪切技术对易团聚、难分散的液态物料效果最佳。     

白炭黑分散细化中剪切技术的应用

介绍了利用最新的剪切技术在沉淀白炭黑分散细化工艺过程中的原理和方法，通过响应面实验对沉淀白炭黑进行了分散细化实验研究，实验表明剪切技术对易团聚、难分散的液态物料效果最佳。     

白炭黑分散细化中剪切技术的应用

介绍了利用最新的剪切技术在沉淀白炭黑分散细化工艺过程中的原理和方法，通过响应面实验对沉淀白炭黑进行了分散细化实验研究，实验表明剪切技术对易团聚、难分散的液态物料效果最佳。     

高压均质-沉淀法制备高分散纳米白炭黑研究

以稻壳灰为原料,对传统沉淀法加以改良,提出了高压均质与沉淀法联用技术。在纳米白炭黑微粒形成初期,采用高压均质技术对微粒进行超微细化,获得了高分散的纳米白炭黑。研究了沉淀反应终点pH、盐酸浓度、反应温度、均质压力、表面活性剂等对纳米白炭黑物化性能的影响,得到了制备纳米白炭黑产品的最佳工艺条件:沉淀反应终点pH为8.5~9.0、盐酸浓度为1.0 mol/L、反应温度为60℃、均质压力为69~103.4 MPa。结果显示,在最佳工艺条件下制得的白炭黑产品白度达到93%左右,DBP吸油值达3.3 mL/g左右,为高纯度、高分散的纳米白炭黑。     

成核阶段对沉淀法白炭黑团聚程度的影响

白炭黑制备过程中发生的团聚会影响其分散性,研究影响白炭黑制备过程中团聚程度的主要因素有助于制备高分散的白炭黑。本文采用正交实验法研究了沉淀法白炭黑制备过程中成核阶段各个因素对白炭黑团聚程度的影响,采用透射电镜表征白炭黑一次粒子大小和团聚程度,采用激光粒度仪表征白炭黑的平均粒径。结果表明,反应温度、硅酸钠浓度及加酸速度是影响白炭黑二次粒子平均粒径及团聚程度的主要因素;高温下,白炭黑一次粒子约为50 nm,团聚程度较高,但二次粒子平均粒径较小;低温下,白炭黑一次粒子约为10 nm,团聚程度略小。随着低温反应时间的增长,白炭黑一次粒子团聚程度增加。     

白炭黑的制备与应用研究进展

简述了白炭黑的结构和性质,并重点综述了其制备方法以及制取过程中的团聚和分散问题,概述了白炭黑在各个领域中的应用情况,提出了今后研究和生产发展的方向。     

高分散沉淀白炭黑的粒径分布研究

利用激光衍射法研究高分散沉淀白炭黑的粒径分布。文中对测试原理、样品制备和测试要求作了详细的阐述。对影响试验结果的因素（超声振幅、超声时间和停放时间等）进行了深入探讨。研究了实验结果的精确度以及粒径大小对胶料物理性能的影响。结果表明，激光衍射法能快速、准确和客观地反映高分散沉淀白炭黑的分散能力和评价材料的品质。在制造绿色轮胎和轮胎半制品过程中，起着调整工艺、优化配方和提高轮胎成品质量的重要作用。     

PEG改性制备高分散白炭黑的研究

在沉淀法制备白炭黑过程中添加聚乙二醇(PEG)能够显著改善白炭黑产品的性能.研究了PEG分子量及加入量对改性白炭黑吸油值(DBP值)及堆积密度的影响,利用扫描电镜(SEM)、透射电镜(TEM)、X射线衍射分析(XRD)及红外光谱(FT-IR)对改性前后的白炭黑进行了对比分析.实验结果表明,PEG分子量为2000、加入硅酸钠溶液的4％时,改性白炭黑的DBP值最大,堆积密度最小,颗粒近似球形且团聚较小,可以有效改善白炭黑产品的分散性能.     

白炭黑填充胶料的焦烧状况研究与改善

研究硅烷偶联剂对白炭黑填充胶料焦烧状况的改善。结果表明:与未添加硅烷偶联剂的胶料相比,添加硅烷偶联剂可显著促进胶料的白炭黑分散并抑制白炭黑在硫化过程中的絮凝,延长焦烧时间;由于形成了白炭黑-硅烷偶联剂TESPT-橡胶网络,硅烷偶联剂TESPT在促进白炭黑分散方面表现出更好的效果,而硅烷偶联剂OTES可以更有效地抑制白炭黑的絮凝,从而延长焦烧时间;两种硅烷偶联剂同时使用可进一步抑制白炭黑的团聚。     

沉淀白炭黑浆料处理设备的研究

本文为沉淀白炭黑制备中的浆料处理工序设计了一种新型设备，介绍该设备的结构，工作原料以及对沉淀白炭黑浆料中的聚集体的分散效果，并对该设备的综合使用性能与传统设计进行了比较。     

Unique behavior of in-situ generated nanosilica particles on physico-mechanical properties of fluoroelastomer

Fluoroelastomer (FKM) rubber containing different weight percentage of in-situ generated nanosilica particles have been prepared by sol-gel method using tetraethoxysilane (TEOS) as precursor and n-butyl amine as catalyst. FKM rubber with precipitated silica particles have also been prepared to compare the effect of in-situ generated nanosilica particles and precipitated silica particles on the physico-mechanical properties of FKM rubber. It is interesting to note that the FKM rubber containing in-situ generated nanosilica particles display excellent tensile stress-strain properties, rheological properties and thermal properties in comparison to the FKM rubber containing precipitated silica particles. The better performance of the in-situ generated nanosilica particles has been attributed to the good dispersion of in-situ generated nanosilica particles in FKM rubber matrix when compared to the precipitated silica particles. The fourier transform infrared (FTIR) spectroscopy clearly confirms the existence of chemical interaction between the FKM rubber chains and the in-situ generated nanosilica particles which leads to the good dispersion of the nanosilica particles in the rubber matrix. Strain sweep studies confirm the presence of more rubber-filler interaction in FKM rubber filled with in-situ generated nanosilica particles. On the other hand, strain sweep studies confirm the presence of more filler-filler aggregation in FKM rubber filled with precipitated silica particles. The dispersion of the in-situ generated nanosilica particles and precipitated silica particles in the surface and bulk of FKM rubber has been studied by field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). Selected samples have been cured to understand the effect of curing on the efficiency of in-situ generated nanosilica particles and precipitated silica particles on the physico-mechanical properties of FKM rubber.     

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。     

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。     

中国沉淀法白炭黑产业发展现状及展望

沉淀法白炭黑是外观呈白色、多孔性无定形水合二氧化硅粉末,具有化学惰性,且耐高温、不燃、无毒、无味、无嗅。因其电绝缘性高、内表面积大,被广泛应用于橡胶、食品、医药、涂料等国民经济多个领域。梳理了国内沉淀法白炭黑主要厂家的生产能力、企业分布等基本情况,介绍了沉淀法白炭黑进出口情况、消费状况和行业技术进展等现状,并对沉淀法白炭黑应用前景进行展望,以期为沉淀法白炭黑生产企业和从事沉淀法白炭黑技术研究人员提供参考。     

纳米二氧化硅对卡波姆凝胶流变行为的影响

采用红外光谱(FTIR)和扫描电子显微镜(SEM)分析了气相法二氧化硅(FS)和沉淀法二氧化硅(PS)的表面性质,结果表明,FS表面比PS含有更多的羟基,在水中分散性更好。利用流变仪对比研究了FS和PS对卡波姆956凝胶流变行为的影响规律,结果表明,FS和PS的加入均能明显提高卡波姆凝胶的弹性模量、屈服应力、触变性等流变学性质;在纳米二氧化硅质量百分数≤4%,FS在卡波姆凝胶中分散粒径较小且更均匀,其对上述流变学性质的增强作用大于PS;纳米二氧化硅质量分数从4%增大到8%时,PS形成大团聚体,能更好地提高上述流变学性质。结合SEM的测试结果阐明了FS与PS同卡波姆之间不同的相互作用方式。     

硅溶胶/苯乙烯-丙烯酸酯共聚物无机-有机杂化水分散液的制备和表征

A stable silica sol with 3-5 nm in diameter, which can form homogeneous film without crack, was prepared and characterized. Then, the inorganic-organic hybrid aqueous dispersion composed of such a silica sol and an emulsion of styrene （St） and acrylate （Ac） copolymer was prepared and the hybrid effect between the silica sol and poly（St-co-Ac） was observed by Fourier transform infra-red （FT-IR） spectroscope. The toughness of the film prepared by this kind of hybrid aqueous dispersion was excellent, as it was enhanced appreciably by commixing with a small amount of poly（St-co-Ac） emulsion. Some amino-polysiloxane modified hybrid aqueous dispersions were also prepared and the properties of the modified dispersions and their films were investigated. The experimental results showed that the film prepared with such an amino-polysiloxane modified hybrid dispersion exhibited excellent hydrophobicity and low surface energy after heat treatment for 1.5 h, during which the formation of the graft copolymer was observed. The surface energy of this film decreases as a result of the enrichment of siloxane segments on the film surface.     

巯基硅烷偶联剂对白炭黑物化性质的影响研究

对用水玻璃溶液和稀硫酸为原料，采用沉淀法制备白炭黑过程中所进行的表面改性进行了研究，考察了改性剂巯基硅烷偶联剂A-189的用量对白炭黑产品吸油值和比表面积等物化性质的影响，进行了扫描电子显微镜（SEM）和红外光谱（IR）分析。试验结果为：改性白炭黑产品的吸油值在2．175—2．567cm^3／g变化，最大比表面积和孔体积分别为271．105m^2／g和0．53cm^3／g。主要结论：使用巯基硅烷偶联剂A-189进行改性，能够得到纳米级的改性白炭黑产品，且粒度分布均匀，改性剂分子与白炭黑颗粒表面发生了化学吸附。     

Effect of surfactant on the pore structure of mesoporous carbon

Mesoporous carbons (MCs) have been synthesized by using thermosetting phenol resin (TPR) as carbon precursor and commercially nanosized silica particles as template. During the synthesis of MCs, a kind of surfactant (Pluronic-F127) was used to modify the surface property of the silica particles. The dispersion capability of the nanosized particles as well as the effect of the surfactant on the pore structure of as-prepared carbons was investigated by transmission electron microscopy (TEM) and nitrogen adsorption, respectively. Results showed that the dispersion ability of silica particles was promoted after the addition of Pluronic-F127, which resulted in the increase of surface area and pore volume of the resultant MC. Pores with the pore size of about 4 nm and 10 nm were developed by adjusting the ratio of silica to the surfactant, and when the amount of surfactant reached a proper value, only pores of about 10 nm appeared. The surfactant had three functions for the pore development of MCs: increasing mesopores of about 10 nm by improving the dispersion capacity of nanosized particles, creation of small mesopores of about 4 nm and blocking the micropores in the carbon matrix.