粉煤灰作橡胶填料影响因素的研究分析

以钛酸酯偶联剂为表面处理剂．对粉煤灰进行表面处理．制得橡胶填料，测试了该填料对橡胶的补强作用。实验表明．表面改性后的粉煤灰对橡胶具有较好的补强作用，可完全替代碳酸钙、碳酸镁或陶土．产生较好的补强效果，用来替代部分炭黑，可以减少炭黑的用量．降低橡胶的成本。     

改性粉煤灰补强橡胶的研究

介绍了粉煤灰经表面处理后作橡胶填料的试验情况。该填料可完全替代陶土和碳酸钙，具有较好的补强效果，可部分替代炭黑用于橡胶制品中，从而降低橡胶的生产成本。     

煤矸石粉用于橡胶补强的研究

以钛酸酯偶联剂为表面处理剂对煤矸石粉进行表面改性处理制得橡胶填料,测试了此填料对橡胶的补强作用,讨论了矸石本身性质及表面处理对其补强性能的影响。结果表明,过３２０目筛,经含量为３％的处理剂表面改性后的矸石填料对橡胶具有较好的补强作用,用其替代陶土能获得较好的补强效果,也可替代部分炭黑,减少炭黑用量,降低橡胶成本。     

改性粉煤灰的粒度对橡胶补强性能的影响

以鸡西发电厂粉煤灰为原料,选择钛酸酯为表面处理剂,对不同粒度的粉煤灰进行表面处理,对其活化指数、润湿接触角、包裹牢固度等指标进行测定。并将改性后的粉煤灰样品填充于橡胶制品中,测试填料对橡胶的补强作用。实验表明,粉煤灰的粒度对橡胶的补强性能有很大的影响,经过钛酸酯偶联剂处理后,粒度级为小于0．0432mm的粉煤灰对橡胶具有较好的补强作用,可部分替代碳黑,减少碳黑的用量,降低橡胶的成本,减少对环境的污染。     

粉煤灰在橡塑复合材料中的应用

介绍了掺有粉煤灰的高分子复合材料的应用研究状况,简述了粉煤灰作为高分子复合材料补强填料的主要影响因素。粉煤灰的粒度、表面吸附性是影响补强性能的关键因素。通过超细粉碎,表面改性,部分或全部替代炭黑用作橡胶补强填料是可行的,大大降低制品的生产成本,提高粉煤灰的利用率。     

煤矸石粉作橡胶补强填料

煤矸石粉作橡胶补强填料煤矸石是与煤伴生的岩石，我们利用包覆技术，对淮南矿区煤歼石粉进行表面改性，用其替代部分炭黑，对橡胶进行补强。１实验１．１试样制备将煤矸石缩分、干燥、粉碎过筛，然后以浸渍法进行表面处理，再经活化即得补强填料成品。１．２性能测试对煤...     

利用煤矸石作橡胶补强填料的研究综述

介绍了我国利用煤矸石制备橡胶补强填料的研究进展 ;论述了煤矸石作为橡胶补强填料的机理 ,影响补强性能的主要因素是煤矸石的粒度、表面吸附性及其主要组成结构 ,对煤矸石进行表面改性 ,部分或全部替代炭黑用作橡胶补强填料是可行的 ,可大大降低橡胶的生产成本     

改性煤矸石粉作橡胶补强填料的研究概况

介绍改性煤矸石粉作为橡胶补强填料的研究进展;论述煤矸作为橡胶补强填料的机理,影响补强性能的主要因素是煤矸石的粒度、表面吸附性及煤矸石的主要组成结构,对煤矸石粉进行表面改性,部分或全部替代炭黑用作橡胶补强填料是可行的,可大大降低橡胶的生产成本.     

改性煤矸石在橡塑高分子材料中的应用

介绍了我国利用煤矸石制备橡胶补强填料的应用现状;简述了煤矸石作为橡胶补强填料的主要影响因素。煤矸石的组成、粒度、表面吸附性是影响补强性能的关键因素。通过超细粉碎,表面改性,部分或全部替代炭黑用作橡胶补强填料是可行的,大大降低橡胶的生产成本,提高煤矸石的利用率。     

改性粉煤灰对橡胶补强作用的研究

对粉煤灰进行分级处理,将小于４５μｍ的粉煤灰经表面改性处理后作为橡胶的补强填充剂。对其作用机理和混炼胶料的加工性能进行试验研究的结果表明,改性粉煤灰的增量补强作用主要取决于它的粒度、形状、表面结构和性质等。其主要技术指标与半补强炭黑相当,用其可部分或全部代替炭黑等常规橡胶填     

改性胶粉对氯丁橡胶性能的影响

研究改性胶粉对氯丁橡胶(CR)性能的影响,并与无机填料轻质碳酸钙和滑石粉进行对比。结果表明:添加改性胶粉后,混炼胶的门尼粘度增大,硫化速度加快,硫化胶的耐热老化性能和耐水性能改善,虽然拉伸强度和耐低温性能有所降低,但下降幅度不大;与填充轻质碳酸钙和滑石粉的胶料相比,填充改性胶粉的胶料综合性能优异。改性胶粉可以作为黑色填料应用于CR橡胶制品胶料中。     

碳酸钙和氢氧化镁对加成型硅橡胶性能的影响

比较了碳酸钙和氢氧化镁对加成型硅橡胶力学、耐热、阻燃和防火性能的影响,分析了填料对硅橡胶热失重过程的影响。结果表明,碳酸钙可以提高硅橡胶的力学和防火性能;氢氧化镁可以提高硅橡胶的阻燃性能,但不能赋予硅橡胶防火性能;碳酸钙和氢氧化镁对硅橡胶防火阻燃性能的影响差异在于填料本身分解温度和硅橡胶燃烧分解温度的匹配性;两种填料并用可以赋予硅橡胶良好的防火、阻燃和耐热性能。     

THE COMPARISON PROPERTIES OF RECYCLE RUBBER POWDER,CARBON BLACK,AND CALCIUM CARBONATE FILLED NATURAL RUBBER COMPOUNDS

The effects of filler loading on the curing characteristics, swelling behavior, and mechanical properties of natural rubber compounds were studied using a conventional vulcanization system. Recycle rubber powder (RRP), carbon black (CB) (N550), and calcium carbonate (CaCO₃) were used as fillers and the loading range was from 0 to 50 phr. Results show that the scorch time, t ₂, and cure time, t ₉₀, decrease with increase in filler loading. At a similar filler loading, RRP shows shortest t ₂ and t ₉₀ followed by CB and calcium carbonate. The tensile strength, tensile modulus, and hardness increase with increase in CB loading, whereas elongation at break, resilience, and swelling properties show opposite trend. For RRP and calcium carbonate filled natural rubber compounds, the tensile strength increases up to 10 phr and starts to deteriorate at higher filler loading. The other properties such as tensile modulus, hardness, elongation at break, resilience, and swelling percentage show a small change (increase or decrease) with increase in RRP and calcium carbonate loading in natural rubber compounds. Overall results indicate that RRP can be used as a cheapener to replace calcium carbonate in natural rubber compounds where improved mechanical properties are not critical.     

Abrasion Property of Epoxidized Natural Rubber

The abrasion resistance of two grades of epoxidized natural rubber (ENR 25 and ENR 50) and one grade of styrene-butadiene rubber (SBR) were studied using an Akron abrasion tester. An accelerated sulfur vulcanization system with 2-mercaptobenzothiazole (MBT) as the accelerator is used throughout the study. Carbon black (N 330), precipitated silica, and calcium carbonate were chosen as the fillers. The range of sulfur and filler loadings was from 1 to 5 phr and 10 to 50 phr, respectively. Mixing was done on a two-roll mill. Results obtained show that for all the rubbers studied, the volume loss due to abrasion decreases with increasing sulfur loading and passes through a minimum at about 3 phr of sulfur. This observation is attributed to the changes of cross-link types from monosulfidic to polysulfidic crosslink as sulfur concentration is increased. However, further sulfur loading would cause a “tight” cure, thus increasing the abrasion loss. For sulfur loading less than 3 phr, ENR 25 indicates the highest abrasion loss, followed by SBR and ENR 50. For the filled stock, minimum loss is observed at about 35–40 phr of filler. Reinforcing filler such as carbon black exhibits better abrasion resistance than calcium carbonate, a nonreinforcing filler. The abrasion loss increases at higher filler loading due to the dilution effect of fillers. Ozone plays an important role in the abrasion property of unsaturated rubbers, as reflected by the higher abrasion loss in the presence of ozone.     

Influence of carbon black in polychloroprene organoclay nanocomposite with improved mechanical,electrical and morphology characteristics

Abstract

The effect of carbon black on nanoclay filled polychloroprene (CR) composites has been investigated. The nanoclay loading is fixed at 5 part per hundred rubbers (phr), and carbon black loading varied from 5 to 20 phr in rubber compounds. The rubber nanocomposites are prepared in laboratory by mixing in two-roll mill. The addition of nanoclay enhances mechanical properties especially tear strength and decreases water absorption without change in electrical properties compared to gum rubber vulcanisates. Wide angle X-ray diffraction and transmission electron microscopy are used to study the microstructure of CR nanocomposites. The addition of 5 parts of nanoclay to 15 phr carbon black filled samples shows synergistic effect between the fillers and suggests that the reinforcement is due to a more developed filler network formation in hybrid filler system than that in single phase filler. Significant improvement in mechanical, electrical and low water absorption properties has been obtained with these nanoclay and carbon black filled rubber nanocomposites. The paper concludes that nanocomposites containing a mixture of organoclay and carbon black in right proportion can be a substitute for rubber components used in underwater cable and device encapsulation applications.     

2种导电炭黑复合橡胶体系的导热性能研究

研究了2种导电炭黑复合天然橡胶材料的导热性能随着温度和填料用量的变化规律。结果表明,温度对于导电炭黑复合体系导热性能的影响不大。乙炔黑复合体系具有极高的导热性能,随着炭黑用量的增加,其导热性能优势越加明显。据透射电镜观察填料的微观形态,乙炔黑链枝状结构丰富,聚集体之间以面接触为主,这是其复合橡胶导热性能优异的原因,乙炔黑复合材料的热导率与炭黑体积分数呈线性关系。40B2复合体系的热导率与炭黑体积分数呈现逾渗规律,逾渗阈值在炭黑体积分数8.30%至13.63%之间。据扫描电镜观察复合材料的微观结构,逾渗现象与炭黑在基体内的分布密切相关。为更精确地描述填料用量与复合体系热导率的关系,对2种复合体系的热导率与炭黑的体积分数进行了回归。     

石墨及其表面改性对硅橡胶导热性能的影响

用双辊混炼机将导热填料分散到聚甲基乙烯基硅氧烷中,再配以增强剂、硫化剂等,经模压硫化制得导热硅橡胶。研究了导热填料种类、石墨的表面改性和用量以及石墨与炭黑的复配对硅橡胶导热性和力学性能的影响。结果表明,在用量相同的情况下,导热填料的导热系数越高,其填充硅橡胶的导热性越好,且硅橡胶的导热系数随导热填料用量的增加而增大。石墨的表面改性改善了石墨与硅橡胶的界面相容性,使硅橡胶的力学性能和导热性都得到提高。不同粒径及颗粒形态的炭黑与石墨复合可改善硅橡胶的导热性和力学性能,导热硅橡胶的拉伸强度和扯断伸长率随复合填料中炭黑用量的增加而提高,当石墨与炭黑质量比为25/5时,硅橡胶的导热系数最高,综合性能较好。     

改性矿物填料增强橡胶/聚氯乙烯共混体系

研究了橡胶、增塑剂、矿物填料和表面处理剂对橡胶／聚氯乙烯(PVC)共混物力学性能的影响,用扫描电镜分析了有机胺类表面处理剂改性高岭土／丁腈橡胶(NBR)／PVC的界面结合状况。结果表明,当NBR用量为30份,邻苯二甲酸二辛酯用量为60份,有机胺类表面处理剂质量分数为3％,填充60份的超细碳酸钙或高岭土或牌号为SMF的蒙脱土时,可得到力学性能较佳的NBR／PVC共混物;不同矿物填料对NBR／PVC共混物的增强作用不同,经有机胺类表面处理剂改性后,以超细碳酸钙、高岭土和蒙脱土SMF的增强效果最为明显。     

Application of rice husk ash as fillers in the natural rubber industry

Rice husk ash (RHA) obtained from agricultural waste, by using rice husk as a power source, is mainly composed of silica and carbon black. A two‐stage conventional mixing procedure was used to incorporate rice husk ash into natural rubber. For comparison purposes, two commercial reinforcing fillers, silica and carbon black, were also used. The effect of these fillers on cure characteristics and mechanical properties of natural rubber materials at various loadings, ranging from 0 to 40 phr, was investigated. The results indicated that RHA filler resulted in lower Mooney viscosity and shorter cure time of the natural rubber materials. The incorporation of RHA into natural rubber improved hardness but decreased tensile strength and tear strength. Other properties, such as Young's modulus and abrasion loss, show no significant change. However, RHA is characterized by a better resilience property than that of silica and carbon black. Scanning electron micrographs revealed that the dispersion of RHA filler in the rubber matrix is discontinuous, which in turn generates a weak structure compared with that of carbon black and silica. Overall results indicate that RHA can be used as a cheaper filler for natural rubber materials where improved mechanical properties are not critical. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 98: 34–41, 2005     

Effect of types of carbon black and cure conditions on dynamic mechanical properties of elastomers

The dynamic mechanical properties of natural rubber and bromobutyl rubber (used in automotive suspension parts) were investigated to determine the effect of particle size of carbon black filler and state of cure of the rubber matrix. The results indicate that state of cure has little effect on storage modulus (hardness and stiffness). However, elastomers with a desirable storage modulus, with low sensitivity to temperature change, can be developed using a filler with a small particle size.