LLDPE在黑母粒中的应用

研究了作为黑母粒载体树脂的LDPE／LLDPE共混物对炭黑分散性的影响。结果表明，当LLDPE的用量适宜时，可以控制体系的熔融流动特性，改进炭黑的分散性，降低分散剂的用量。在所有的实验配方中，当LDPE／LLDPE的共混比为1：1，分散剂的用量仅为5％时，炭黑的分散效果最佳，即薄膜的黑度值最大，炭黑的粒子最小且粒径分布最窄。分散剂用量的降低不仅有助于提高产品质量而且有助于降低生产成本。     

农用地膜染色用炭黑母粒的研制

主要介绍线性低密度聚乙烯(LLDPE)农用地膜染色用炭黑母粒的工艺技术,试验配方的选择和制品加工应用的流变性等。其中包括塑料专用国产炭黑品种的选择试验,载体树脂的选择试验,炭黑、载体和其他助剂等的不同配方试验最佳条件选择等,并将制造的炭黑母粒分批吹制成LLDPE黑色地膜用于农田铺膜试验.     

用于液晶聚芳酯纤维原液着色的色母粒制备

选用炭黑作着色剂，制备了用于液晶聚芳酯纤维原液着色的色母粒。通过对分散剂耐热性、分散剂用量及母粒生产工艺的研究，探讨了母粒最佳制备工艺。制备的色母粒中炭黑分散性良好，无黑点和气泡产生。色母粒熔点、黏度与纯树脂接近，两者相容性好。使用色母粒进行长时间纺丝，过程压力上升缓慢，连续纺丝时间长，纤维呈均匀的深灰色，力学强度损失低。     

碳黑母粒分散机理探讨

采用不同配方和不同生产工艺制备了碳黑母粒，研究了表面活性剂咪唑啉、分散剂聚乙烯蜡的用量和混炼工艺对碳黑母粒分散性能的影响，并通过测定薄膜黑度的方法对碳黑的分散性能进行了分析。     

可导电玻璃纤维增强聚丙烯材料的性能分析

研究了导电炭黑(CB)的不同添加方式、不同导电炭黑母粒含量对玻璃纤维增强聚丙烯材料的表面电阻率、力学性能和熔体流动速率的影响.结果表明,导电炭黑母粒对聚丙烯材料的分解温度没有影响;导电通路的形成与导电炭黑在玻璃纤维增强聚丙烯体系中的分散性有关;添加导电炭黑母粒体系中更有利于形成导电通路;当导电炭黑母粒添加至40％时,玻...     

提高载重轮胎胎面胶耐磨性的研究

对载重轮胎胎面胶配方进行改进，采用炭黑N234替代炭黑N220，并选用炭黑分散助剂以提高炭黑的分散性，选用加工助剂，以改善半成品加工性能。结果表明，改进配方后胎面胶胶料的综合性能优于原生产配方，耐磨性能提高了20％以上，且胎冠温升有所降低。     

功能复合型炭黑分散剂GC-01在胎面胶中的应用

研究炭黑分散剂GC—01在斜交轮胎胎面胶中的应用。试验结果表明，使用炭黑分散剂GC-01可显著降低胎面胶的门尼粘度，提高炭黑分散性；在胎面胶配方中加入2份GC—01，同时对硫化剂或炭黑适当减量，可使胶料获得优良的综合性能。     

CIIR在水胎包皮胶中的应用

采用CIIR／NR(并用比90／10)并用对水胎包皮胶配方进行改进，并与生产配方进行对比。结果表明，试验配方胶料的邵尔A型硬度、300％定伸应力、拉断伸长率和撕裂强度与生产配方胶料相近，拉伸强度较低，但老化后基本不降低，拉断永久变形较小；采取两段混炼工艺可提高胶料的塑性和炭黑的分散性；改进后可提高水胎使用寿命，减小工人劳动强度，综合效益显著。     

全钢载重子午线轮胎0°带束层胶配方及混炼工艺优化

试验研究全钢载重子午线轮胎0°带束层胶配方及混炼工艺的优化效果。结果表明,在全钢载重子午线轮胎0°带束层胶配方中并用炭黑N660,增粘树脂选用TKM-M-11,并减小炭黑N375、白炭黑和不溶性硫黄用量,同时在混炼工艺中采取分段加氧化锌、多段加炭黑等优化措施,降低了胶料的门尼粘度,提高了炭黑分散性、胶料自粘性及硫化胶物理性能,改善了0°带束层的表面粘性,提高了成品轮胎的强度和耐久性能,有效地解决了0°带束层散线的质量问题。     

胎面胶对轮胎滚动阻力的影响

综述胎面胶配方(包括橡胶品种和微观结构、炭黑品种等)和混炼工艺对轮胎滚动阻力的影响.采用橡胶并用、通过改变微观结构设计具有低滞后损失的橡胶、填充高分散性白炭黑和改性炭黑、采用适当的混炼工艺,可以降低轮胎的滚动阻力.     

Effects of dispersing agents on dispersity and mechanical properties of carbon black/PET

Three kinds of dispersing agents, all copolyesters, were synthesized from the polycondensation reaction of dimethyl terephthalate (DMT), dimethyl isophthalate (DMI), sebacic acid (SA), and 1,4-butandiol (BD). Copolyester from DMT, SA, and BD was designated as PBTS; from DMT, SA, DMI, and BD as PBTIS; and from DMT, DMI, and BD as PBTI. Carbon black masterbatches were prepared by mixing carbon black into the dispersing agents in a Brabender Plasticorder PLE331. Using single screw extruder, masterbatches were compounded with poly(ethylene terephthalate) in 3 wt% concentration and mechanical properties of the compounds were investigated. Gel permeation chromatography data implied that thermal degradation of polymeric dispersing agents was not very significant. Capillary rheometer tests showed that PBTI has the highest viscosity and shear sensitivity of the three dispersing agents. Volume resistivities of each masterbatch were increased as the rotor rpm of the Brabender and mixing time increased. Transmission electron micrographs showed that dispersion of carbon black was enhanced by increasing the melt viscosity of the dispersing agent. The performance and mechanical characteristics of carbon-black-filled PET compounds depends directly on the dispersion quality of the carbon black in the masterbatch. Mechanical properties of compounds were improved by increasing dispersion of carbon black and increasing numbers of rigid aromatic groups in the copolyester dispersing agent.     

Effect of coupling agent on crystallization and rheological properties of poly(ethylene terephthalate) composite masterbatches

Poly(ethylene terephthalate)/carbon black/coupling agent composite masterbatches were fabricated using separate feeding technique. The effect of coupling agent on crystallization of composite masterbatches was investigated by differential scanning calorimetry, wide‐angle X‐ray diffraction, and Fourier transform‐infrared spectroscopy, respectively. The results show that the strong interfacial interaction among poly(ethylene terephthalate) (PET), coupling agent and carbon black hinders chains mobility in process of PET crystallization, which is illustrated by interfical structure model. Whereas, the crystallinity of composite masterbatch increases due to uniform dispersion of carbon black modified by coupling agent. Activation energy of viscous flow of the composite masterbatches is closer to that of virgin PET, so the spinning parameters can be controlled according to each other. Besides, structural viscosity index of composite masterbatches is greater due to strong interfacial interaction among PET, coupling agent and carbon black. Thus, in order to smooth spinning, the composite masterbatches need greater shear rate compared with PET/carbon black masterbatch. POLYM. COMPOS., 38:2358–2367, 2017. © 2015 Society of Plastics Engineers     

炭黑对动态硫化POE/PP热塑性弹性体性能的影响

采用动态硫化法制备POE/PP共混物,研究了过氧化二异丙苯（DCP）对POE/PP体系熔体流动速率（MFR）和力学性能的影响。交联助剂硫磺（S）的加入有效地提高了交联效果,当m（DCP）/m（S）=2/0.2时,体系的综合力学性能最佳。通过不同加工工艺制备POE/PP/炭黑共混物,并研究了炭黑用量对体系力学性能和老化性能的影响。结果表明,母料法制备的共混物更有利于炭黑的分散,体系性能更好,炭黑的加入使体系的耐热老化性和抗紫外性能明显改善。     

环保改性补强剂BG802L在全钢载重子午线轮胎气密层和胎侧胶中的应用

研究环保改性补强剂BG802L在全钢载重子午线轮胎气密层和胎侧胶中的应用。结果表明:在气密层胶中以补强剂BG802L部分替代炭黑N660,胶料的门尼粘度减小,门尼焦烧时间延长,炭黑分散性和气密性提高,硫化胶的拉伸强度和拉断伸长率增大;在胎侧胶中以补强剂BG802L部分替代炭黑N375,胶料的加工安全性和流动性较好,硫化胶的拉伸强度和拉断伸长率增大,炭黑分散性提高;采用补强剂BG802L可以降低轮胎生产成本。     

炭黑预分散混炼工艺在全钢载重子午线轮胎胎面胶生产中的应用

以预分散炭黑/天然橡胶母胶和一段混炼胶的排胶温度、填充因数和转子转速为因子,采用正交试验设计方法研究炭黑预分散混炼工艺在全钢载重子午线轮胎胎面胶生产中的应用。结果表明,与常规混炼工艺相比,采用炭黑预分散混炼工艺胶料的炭黑分散性提高,物理性能和耐老化性能改善,成品轮胎的耐久性能和高速性能提高,退赔率下降。     

混炼工艺对NR/SBR/BR/TRR农业轮胎胎面胶性能的影响

研究混炼工艺对天然橡胶(NR)/丁苯橡胶(SBR)/顺丁橡胶(BR)/轮胎再生橡胶(TRR)农业轮胎胎面胶性能的影响。结果表明:胶料混炼适合采用两段混炼工艺,一段混炼为SBR和TRR与部分炭黑混炼,二段混炼为一段混炼胶与NR、BR、剩余炭黑和其他配合剂混炼;随着一段混炼炭黑加入量增大,硫化胶的拉伸强度和撕裂强度呈增大趋势,一段混炼炭黑加入量较大时硫化胶的拉断伸长率较高,耐磨性能较好;一段混炼加入5/6炭黑的混炼工艺硫化胶的炭黑分散性较好,拉伸强度和撕裂强度较大,耐磨性能较好,生热较低,耐热氧老化和耐臭氧老化性能较好。     

纤维级碳黑导电母粒研究进展

介绍了纤维级碳黑(CB)导电母粒的制备方法,分析了偶联剂用量、分散剂用量、共混体系组成、螺 杆转数和混合时间等对纤维级CB导电母粒导电性的影响。指出提高CB的分散性,降低导电母粒的电阻 值,提高导电母粒的可纺性是开发高品质纤维级CB导电母粒的关键。     

抗菌丙纶的制备及其性能研究

将抗菌丙纶母粒(含质量分数20％无机载银抗菌粒子)与PP进行熔融共混、切片,再通过熔融纺丝制得抗菌丙纶。扫描电镜观察经表面改性处理的无机抗菌粒子在丙纶中分散较好,大小均匀,且与PP基体具有良好的界面相容性;DSC测试表明:抗菌粒子对PP基体有异相成核作用,使PP结晶度和熔融温度略有提高;加入无机抗菌粒子,降低了丙纶的力学性能,添加量宜1％;通过改变纤维的拉伸倍数,提高抗菌丙纶的力学性能,拉伸倍数为8时,其力学性能最好;该抗菌丙纶对革兰氏阴性和阳性菌的杀菌率都大于99.9％,经水洗后仍有较好的抑菌效果,具有一定的长效抗菌性。     

Nanocomposites from styrene-butadiene rubber (SBR) and multiwall carbon nanotubes (MWCNT) part 1: Morphology and rheology

Because of the exceptionally high modulus and aspect ratios of multiwall carbon nanotubes (MWCNT), there has been much interest in using them as reinforcing agents for polymer composites. However, the commercial implementation of such nanocomposites has generally met with very limited success owing to poor dispersion of the MWCNT in the polymer matrix. A strategy that overcomes many of these difficulties is described here with a view towards incorporating MWCNT with carbon black or silica for improved elastomer performance in such applications as tires. Key issues are control of the MWCNT surface functionality for proper individual tube dispersion, their aspect ratio for a balance of mechanical performance versus melt processability and an appropriate masterbatch concentration for ease of further formulation by rubber goods manufacturers. Styrene-butadiene rubber (SBR), commonly used as a tread stock for tires, is employed here as the matrix for creation of a masterbatch with oxidized MWCNT (12.3–15 wt.%). Masterbatch rheology is necessary to understand how to achieve good dispersion and conformation of the MWCNT in the final product. Rheological characterization of the masterbatch nanocomposites and their dilutions over shear rate ranges relevant for processing will be described. Scanning transmission electron microscopy (STEM) investigations have revealed that this process produces good dispersion of the MWCNT's in the SBR matrix. The distribution of diameters, contour lengths, and end-to-end distances of the MWCNT in these formulations has also been determined. Effective tube aspect ratios for the nanocomposites with various MWCNT loadings were estimated by analysis of the rheological data for uncured specimens and the dynamic mechanical properties of cured composites using the Guth–Gold–Smallwood theory. These materials do not show a high level of electrical conductivity as might be expected from a percolation concept, signifying excellent tube dispersion and formation of a bound rubber layer on the discrete MWCNT.     

炭黑分散性对轮胎胎面胶性能的影响

研究炭黑分散性对全钢载重子午线轮胎胎面胶性能的影响。结果表明:提高密炼排胶温度和密炼能耗可以提高炭黑的分散性;炭黑分散性提高,有利于改善胶料的加工工艺性能和加工安全性能,提高物理性能和耐磨性能,降低生热。