化学改性脱硫灰取代部分炭黑制备环保型丁苯橡胶及其性能

用硅烷偶联剂Si69和KH550对脱硫灰进行化学改性,用改性脱硫灰取代部分炭黑与丁苯橡胶复合,制备环保型丁苯橡胶,对其进行了表征,采用均匀设计结合BP神经网络建立模型优化工艺参数. 结果表明,最优制备工艺参数为Si69和KH550用量分别为4.3wt%和3.8wt%、无水乙醇用量22.1wt%、搅拌速度705 r/min、反应温度82℃,该条件下所制环保型丁苯橡胶的力学性能为拉伸强度19.64 MPa、撕裂强度44.96 kN/m、邵氏A硬度66. 实验结果与模型预测值吻合较好,相对误差为3.03%~2.65%.     

改性硼酸镁晶须/丁苯橡胶复合材料的制备与性能

采用偶联剂Si69对硼酸镁晶须进行改性,制备改性硼酸镁晶须/丁苯橡胶(SBR)复合材料,并对其性能进行研究。结果表明:硼酸镁晶须的加入使复合材料的物理性能和耐磨性能均有不同程度的提高;与未改性硼酸镁晶须相比,加入改性硼酸镁晶须的复合材料的物理性能较好。硼酸镁晶须能够显著提高复合材料的耐磨性能;与未改性硼酸镁晶须相比,加入改性硼酸镁晶须的SBR复合材料的耐磨性能较好。     

天然橡胶/脱硫灰复合材料的制备及性能研究

以脱硫灰为补强填料,采用直接共混法制备天然橡胶(NR)/脱硫灰复合材料,研究了不同用量的脱硫灰对NR/脱硫灰复合材料性能的影响。结果表明,脱硫灰可以赋予NR复合材料良好的热稳定性,提高NR复合材料的力学性能,改善NR复合材料的综合性能。将脱硫灰作为一种新型补强填料,对实现脱硫灰的资源再利用具有积极意义。     

改性竹炭/丁苯橡胶复合材料的制备及其性能

以竹炭作为填料,通过模压法制备出竹炭/丁苯橡胶复合材料,研究竹炭对丁苯橡胶硫化性能的影响,以及竹炭对复合材料力学性能、硬度、DIN磨耗和微观形貌的影响。结果表明,经偶联剂改性的竹炭加入到丁苯橡胶中可以提高硫化速率,当改性竹炭粒径大小为109μm,添加量为20份时,改性竹炭/丁苯橡胶复合材料力学性能最好;扫描电镜结果表明,改性竹炭/丁苯橡胶中填料与基体材料界面结合的较为紧密,相容性较好。     

改性淀粉/炭黑/丁苯橡胶复合材料的耐疲劳性能研究

采用硅烷偶联剂KH-550对淀粉进行改性,制备改性淀粉/炭黑/丁苯橡胶复合材料,并对其耐疲劳性能进行研究.结果表明:与未加改性剂的胶科相比,加入改性剂的混炼胶焦烧时间和正硫化时间缩短,转矩变化不大,硫化胶综合物理性能较好;当改性剂用量为1份时,复合材料的耐疲劳性能最好;复合材料的耐疲劳性能与其300％定伸应力、抗切割性能及应力松弛相关.     

煤的化学脱硫脱灰处理

0 引言作为防止由煤炭利用造成的环境污染的技术,近年来,煤炭高度分选技术(AdvancedCoal cleaning Technique,以下称 ACCT)引起人们的关注。这是一种将现场选煤进一步微粉碎,促进煤质与矿物质单体分离,利用它们的物性差分离和通过化学处理进一步脱硫获得优质洁净煤的技术。目前,该项技术在各国广泛应用。作者进行了 ACCT 的研究,以高锥度磁力分选(HGMS)法、柱式浮选法、分径柱式浮选法,以及化学处理方法为对象。     

丁苯橡胶接枝马来酸酐增容丁苯橡胶/蛭石复合材料的制备

通过力化学接枝反应制得丁苯橡胶接枝马来酸酐,用傅里叶变换衰减全反射红外光谱对接枝物进行了定性表征。将所制备的丁苯橡胶接枝马来酸酐应用于丁苯橡胶/蛭石复合材料体系中,研究了膨胀蛭石和接枝单体马来酸酐的用量对复合材料性能的影响,并通过电子扫描显微镜观察了复合材料内部的微观结构。实验结果表明:当接枝单体用量为6phr、膨胀蛭石用量为15phr时,复合材料综合性能较好。适量丁苯橡胶接枝马来酸酐的生成,有利于改善丁苯橡胶与膨胀蛭石两相间的界面结合。     

接枝改性淀粉/丁苯橡胶复合材料的制备与性能研究

采用固相法制备了玉米淀粉接枝马来酸酐(MAH)、甲基丙烯酸甲酯(MMA)和丙烯酸丁酯(BA)的共聚物Starch-g-MAH/MMA/BA(SMMB)。采用机械共混法制备了接枝改性淀粉/丁苯橡胶(SMMB/SBR)复合材料,研究了复合材料的力学性能、动态力学性能以及微观形态。结果表明,SMMB/SBR复合材料的力学性能优于未改性淀粉/SBR复合材料和纯SBR。与纯SBR硫化胶相比,SMMB/SBR复合材料的玻璃化转变温度(Tg)升高。微观形态分析显示,淀粉经改性后粒子尺寸减小,在SBR中的分散性得到了改善,与SBR基体的相容性得到了提高。     

改性碱式氯化镁晶须/丁苯橡胶复合材料制备与性能研究

以工业活性轻烧氧化镁粉和盐酸为原料,采用水溶液法制备了碱式氯化镁晶须,继而采用硅烷偶联剂对碱式氯化镁晶须进行改性,然后将其与丁苯橡胶混炼得到改性碱式氯化镁晶须/丁苯橡胶复合材料,研究了改性碱式氯化镁晶须对丁苯橡胶力学性能及热学性能的影响。结果表明：采用水溶液法制备得到的碱式氯化镁晶须结构为Mg₂（OH）₃Cl·4H₂O,呈微细纤维状,分布较均匀,长径比大于20;改性碱式氯化镁晶须的加入,可以改善丁苯橡胶的机械强度和阻燃性能。     

轿车轮胎胎面胶用高岭土/丁苯橡胶复合材料制备方法

由武汉理工大学和北海高岭科技有限公司申请的专利(公开号CN 101935414A,公开日期2011-01-05)"轿车轮胎胎面胶用高岭土/丁苯橡胶复合材料制备方法",提供了一种轿车轮胎胎面胶用高岭土/丁苯橡胶(SBR)复合材料的制备方法,包括高岭土表面改性、混炼工艺和硫化工艺等,     

Sequential interpenetrating polymer network based on styrene butadiene rubber and polyalkyl methacrylates

A series of sequential interpenetrating polymer network (IPNs) based on styrene butadiene rubber (SBR) and polyalkyl (methyl, ethyl, and butyl) methacrylates have been prepared by using tetraethylene glycol dimethacrylate as crosslinker. The IPNs were characterized by infrared spectrophotometer, dynamic mechanical analyzer, thermogravimetric analyzer, and swelling study. IPNs have exhibited higher tensile properties compared with pure SBR. IPNs based on PMMA have shown higher tensile strength compared with others. Dynamic mechanical analysis has shown that the IPNs have superior dynamic properties than SBR. Because of IPN formation, tan δ peak shifted inward between SBR and acrylates. Although the magnitude of tan δ decreased, the peaks were broadened because of micro heterogeneous phase separation. At higher concentration of methacrylate, splitting in tan δ peak was noticed because of phase separation. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 1120–1126, 2007     

溶聚丁苯橡胶/炭黑/短纤维多相复合材料的动态力学性能

研究了短纤维用量和黏合水平、测试温度及频率对溶聚丁苯橡胶（SSBR）／炭黑／短纤维复合材料（SFRC）动态力学性能的影响。结果表明,SFRC的储能模量（E’）随短纤维用量的增加而增大;填充预处理短纤维的SFRC的E’大于填充同种未处理短纤维的SFRC,损耗因子（tanδ）则是后者大于前者（填充20份尼龙短纤维的SFRC除外）。与相同填充量的纯炭黑硫化胶相比,短纤维部分取代炭黑后,硫化胶在大于15℃时的E’增大（填充未处理聚酯短纤维的SFRC除外）,tanδ减小;SFRC的E’和tanδ随频率的增加而增大,但频率为50～100Hz时,随着温度的升高,短纤维用量越高,SFRC的E’减小,且E。和tanδ受频率的影响越小。     

橡胶助剂Silane-M对丁苯橡胶/白炭黑复合材料硫化性能的影响

用硫化仪考察了橡胶助剂3-苯并噻唑硫代-1-丙基-三乙氧基硅烷(Silane-M)对丁苯橡胶/白炭黑复合材料硫化性能的影响.结果表明,Silane-M可明显缩短丁苯橡胶/白炭黑复合材料的正硫化时间,但不影响其焦烧时间.Silane-M具有一定的促进作用,可以加快硫化速率.未添加和添加6份(质量)Silane-M的丁苯橡胶/白炭黑复合材料在135～160 ℃的硫化温度系数和硫化反应表观活化能均比较接近,2种复合材料的硫化性能对温度的依赖性基本一致.     

SMC晶须在丁苯橡胶中的应用

对硅镁钙晶须（SMC晶须）在丁苯橡胶（SBR）中的应用进行了研究,考察了晶须用量（0～50phr）对胶料的硫化特性和硫化胶的力学性能的影响,并与常用的填料白炭黑（WCB）和碳酸钙（CaCO3）进行了比较。实验结果表明：SMC晶须对SBR有促进硫化作用;SMC晶须对SBR具有一定的补强作用,拉伸强度随着晶须用量的增加而增大;用量相同时,SMC晶须填充的复合材料硬度和撕裂强度与WCB填充的相当,300%定伸应力比WCB填充的高,拉伸永久变形比WCB小得多;SMC晶须补强效果远优于CaCO3。     

The effects of filler content on cure and mechanical properties of dichlorocarbene modified styrene butadiene rubber/carbon black composites

A study has been carried out on the curing characteristics and mechanical properties of carbon black filled dichlorocarbene modified styrene butadiene rubber (DCSBR). Processing characteristics such as optimum cure time and maximum torque increases with increasing of the concentration of carbon black in DCSBR whereas scorch time decreases. The mechanical properties and resistance of the vulcanizate towards thermal, flame and oil resistance have been carried out. Variation of bound rubber content of carbon black filled DCSBR and the influence of the extracting temperature on the bound rubber content was investigated and its activation energy was calculated from the Arrhenius plot. The reinforcing nature of the filler was assessed from stress strain and swelling data. The enhancement in mechanical properties was supported by data on the increased content of crosslink density in these samples obtained from swelling and stress strain analysis. The results of the studies indicate that carbon black can be used as a good reinforcing filler for DCSBR.     

Effect of liquid isoprene rubber on dynamic mechanical properties of emulsionpolymerized styrene/butadiene rubber vulcanizates

The effect of liquid isoprene rubber (LIR) on the dynamic mechanical properties of emulsion‐polymerized styrene/butadiene rubber (ESBR) vulcanizates was investigated by temperature sweep using dynamic mechanical analysis. The introduction of LIR led to ESBR vulcanizates having higher loss factor (tan δ) in the temperature range ? 30 to 0 °C, and lower tan δ in the range 60 to 80 °C. A small amount of LIR‐403 (LIR with carboxyl groups) led to a significant change in tan δ: the addition of LIR‐403 (3 phr) led to a 7.5% increase in tan δ from ? 30 to 0 °C, and a 24.9% decrease in tan δ from 60 to 80 °C. It was found that the introduction of LIR increased the bound rubber content in the ESBR compound. Equilibrium swelling experiments showed that the crosslink density of the vulcanizates increased after the introduction of LIR‐403 or LIR‐50 (general purpose LIR). The change in tan δ from 60 to 80 °C was related to polymer–filler interactions. The characteristic constant of filler–ESBR matrix interaction (m) was calculated. At a given filler volume fraction, the increase in m in the presence of LIR could be well related to the decrease in tan δ from 60 to 80 °C. The influence of LIR on filler network in the ESBR compound was also investigated by strain and temperature sweeps using a rubber processing analyzer. Copyright © 2011 Society of Chemical Industry     

提高聚合温度增产的研究

研究了乳液聚合丁苯橡胶(ESBR)合成工艺中不同聚合反应温度及引发剂用量对聚合反应速率的影响.实验结果表明,在聚合反应温度提高至8℃,控制聚合反应速率基本不变的条件下,可降低10%引发剂用量,减少制冷量,而橡胶的凝胶含量及分子量分布正常,产品物性达到优级品指标.     

提高转化率对乳聚丁苯橡胶性能的影响

以吉林石化公司有机合成厂的乳聚丁苯橡胶(SBR)生产配方为标准配方,研究了聚合反应时间对转化率的影响,分析了提高转化率对SBR的生胶门尼黏度、结合苯乙烯含量、凝胶含量、相对分子质量及其分布、胶乳黏度等基本性能的影响。结果表明,在标准配方条件下,延长聚合反应时间,转化率可以达到70%。转化率为70%时所得SBR与转化率为62%时所得SBR相比,前者的生胶凝胶含量和胶乳黏度均增大了1倍,数均相对分子质量、重均相对分子质量和Z均相对分子质量均高于后者,相对分子质量分布变宽,且前者的生胶结合苯乙烯含量能够达到产品标准,而生胶门尼黏度和在50 m in时的300%定伸应力偏高于产品优级品要求。