改善轮胎性能的钕系高顺式BR

概述BR生产现状，重点介绍3种不同牌号的钕系BR的分子结构参数、基本性能、胶料混炼特性、硫化胶性能以及在载重斜交轮胎胎冠和胎侧以及全钢子午线轮胎胎侧中的应用情况，并与镍系BR进行对比。试验表明，在载重斜交轮胎中应用钕系BR，胶料的混炼工艺性能可达到镍系BR胶料的水平，且轮胎的耐久性和速度性能比镍系BR轮胎高，胎冠和胎侧温度比镍系BR轮胎低；在全钢子午线轮胎胎侧中应用钕系BR，可提高轮胎的耐久性。     

绿色轮胎胎面用合成橡胶的应用进展

介绍绿色轮胎胎面用合成橡胶溶聚丁苯橡胶(SSBR)和顺丁橡胶(BR)的研究进展。一代、二代和三代SSBR在轮胎胎面中应用后逐渐使轮胎的耐磨性能、滚动阻力和抗湿滑性能间的平衡性提高。BR在轮胎胎面胶中使用的主要为镍系BR和钕系BR,镍系BR由于价格便宜在国产轮胎胎面中应用较多,而钕系BR由于综合性能优异具有持续发展的潜能。     

不同牌号钕系顺丁橡胶在轮胎胎圈胶中的应用性能对比

研究不同牌号钕系顺丁橡胶(BR)与镍系顺丁橡胶(BR9000)在轮胎胎圈胶中的应用性能。结果表明,与镍系BR9000相比,钕系BR加工性能略差,混炼胶交联密度增大,硫化胶拉伸强度增大,滚动阻力降低,生热性能较优,其他性能相当,适用于高性能轮胎胎圈胶。综合分析,钕系BR CB24和BR40具有更低的滚动阻力和较优的生热性能,适合应用于低滚动阻力轮胎胎圈胶中。     

钕系顺丁胶在轮胎胎面胶中的应用

研究钕系顺丁橡胶BR44等量代替镍系BR9000在轮胎胎面中的应用。结果表明,与BR9000相比,BR44具有较好的耐磨和耐撕裂性能。使用钕系顺丁胶BR44的成品轮胎与使用BR9000的成品轮胎相比,胎面胶物性接近,经济效益可观。     

钕系顺丁橡胶在轻型载重轮胎胎面胶中的应用

研究钕系顺丁橡胶（BR）44等量替代镍系BR9000在轻型载重轮胎胎面胶中的应用情况。结果表明：与BR9000胶料相比,BR44胶料具有更好的耐磨和抗撕裂性能;与采用BR9000的成品轮胎相比,采用BR44的成品轮胎胎面胶的物理性能略优或相当,成品轮胎的耐久性能较优,成本降低。     

钕系顺丁橡胶在缺气保用轮胎支撑胶中的应用

研究钕系顺丁橡胶（BR）在缺气保用轮胎支撑胶中的应用。结果表明：在缺气保用轮胎支撑胶配方中使用钕系BR等量替代30份的天然橡胶，胶料的加工性能和加工安全性提高，硫化胶的硬度降低，拉伸强度、抗撕强度和回弹值提高，压缩疲劳温升大幅降低；成品轮胎的强度性能、耐久性能、高速性能和零气压性能均提高，且均满足相应国家标准和企业标准要求。     

窄相对分子质量分布钕系顺丁橡胶在全天候轿车子午线轮胎胎面胶中的应用

研究国产窄相对分子质量分布钕系顺丁橡胶(BR9110)在全天候轿车子午线轮胎胎面胶中的应用,并与国外同类型钕系顺丁橡胶(Nd-43)进行对比。结果表明:与Nd-43胶料相比,BR9110胶料硫化时间相近,炭黑分散性较好,工艺性能相近;两者硫化胶的拉伸性能和动态力学性能相当,BR9110硫化胶热空气老化后性能保持率较高;采用BR9110胶料的成品轮胎各项性能与采用Nd-43胶料的成品轮胎相当。     

稀土合成橡胶的发展状况

主要介绍稀土顺丁橡胶(BR)、稀土异戊橡胶(IR)和稀土丁异戊橡胶(BIR)的生产和研究状况。钕系BR(Nd-BR)是BR中顺式含量最高(顺式-1,4-结构物质的量分数可达0.98以上)、综合性能最好的胶种,将替代其他BR成为高性能子午线轮胎的主要原料。稀土IR合成技术为我国首创,钕系IR(Nd-IR)主要应用于医用器械领域,钛系IR(Ti-IR)和Nd-IR主要应用于轮胎中。而钕系BIR(Nd-BIR)脆性温度低于-80℃,Nd-BIR在低温材料和轮胎中具有广阔应用前景。     

钕系顺丁橡胶在绿色轮胎胎面胶中的应用

研究钕系顺丁橡胶(Nd BR)在绿色轮胎胎面胶中的应用。结果表明:与未采用Nd BR的胎面胶相比,采用20份Nd BR的胎面胶门尼粘度较大,门尼焦烧时间较短;强伸性能相当或略差,耐热老化性能和耐磨性能提高,滚动阻力和生热降低。Nd BR有利于提高胎面胶耐磨性能及降低滚动阻力和生热,可作为绿色轮胎用原材料。     

钕系顺丁橡胶在全钢载重子午线轮胎胎面胶中的应用

研究钕系顺丁橡胶(Nd BR)在全钢载重子午线轮胎胎面胶[天然橡胶(NR)/顺丁橡胶(BR)并用胶]中的应用。结果表明:在全钢载重子午线轮胎胎面胶中采用Nd BR(BR CB22和BR CB24)等量替代镍系顺丁橡胶(Ni BR)(BR9000),胶料的F_(max)较大,t_(90)和t_(100)延长,抗硫化返原性能改善,拉伸性能、抗撕裂性能、耐磨性能、耐老化性能和耐疲劳性能提高,动态生热和压缩疲劳生热降低;与采用BR CB24的胎面胶相比,采用BR CB22的胎面胶的动态生热和压缩疲劳生热更低,综合性能更好;采用BR CB22的胎面胶的成品轮胎滚动阻力降低。     

乙烯酮(双乙烯酮)下游产品废水的治理技术

乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。     

分解炉扩径的技术改造

我厂3号回转窑(Φ4m×60m)生产线在1996年年底由SP窑(产量912t/d)改为NSP窑(产量1320t/d),预分解系统为四级旋风预热器带离线式分解炉     

水泥水化热测定方法综述

水泥水化热是中、低热水泥和核电工程用水泥的一项关键的技术指标。全球范围内测定水泥水化热的方法有溶解法、直接法/半绝热法、等温传导量热法三种。本文总结了中、美、欧相关方法标准,对其测试原理、仪器设备、试验过程等方面进行了比对,并对其在领域的应用做了简单的概括。     

A study of miscibility of blends of polybutadienes of varying microstructure

The miscibility of various amorphous polybutadienes with mixed microstructures of 1,4 addition units (cis, 1,4 and trans 1,4) and 1,2 addition units have been investigated. The studies here involved optical transparency, differential scanning calorimetry, and small angle light scattering. It was found that a 90 percent (cis) 1, 4 addition polybutadiene was immiscible with high (91 percent) 1,2 addition polybutadiene. Reduction of the 1,2 content to 71 percent induced an upper critical solution temperature (UCST) with the cis 1,4 polymer. Polybutadienes with 50 percent and 10 percent 1,2 contents were miscible above the crystalline melting temperature of the cis 1,4 polybutadiene. Immiscibility of the 91 percent 1,2 addition polymer was also found with a 10 percent 1,2 polybutadiene. The latter polymer also exhibits an UCST with the 71 percent 1,2 polymer. The results are used to interpret the characteristics of blends of polybutadienes of varying microstructure.     

几种乙炔加压设备性能的比较

阐述并比较了几种加压设备在乙炔加压清净过程中的性能和特点。     

粉煤灰中烧失量检测的不确定度分析

以F类粉煤灰为例,详细介绍了测定粉煤灰中烧失量的步骤、计算数学模型、影响测量不确定度的因素以及各项测量不确定度分量评定,人员、设备、材料、方法、环境都是影响测量不确定的因素。     

生物油的成分分析及物性测定

以添加FeCl2的ZnCl2-KCl混合熔盐裂解纤维素和秸秆,制得生物油。采用傅立叶变换红外光谱法和气相色谱-质谱法分析生物油的成分。结果表明,生物油中成分复杂,含有氧元素、多种有机化合物,主要包括酮类、醛类、酚类及羧酸类等。测定了20～80℃生物油的密度和粘度,发现生物油的密度与温度呈较好线性关系,而生物油的粘度均大于水的粘度,且不同熔盐体系对秸秆生物油的粘度无较大影响。     

Effect of degree of deacetylation of chitosan on the kinetics of ultrasonic degradation of chitosan

The objective of the study was to explore the effect of the degree of deacetylation (DD) of the chitosan used on the degradation rate and rate constant during ultrasonic degradation. Chitin was extracted from red shrimp process waste. Four different DD chitosans were prepared from chitin by alkali deacetylation. Those chitosans were degraded by ultrasonic radiation to different molecular weights. Changes of the molecular weight were determined by light scattering, and data of molecular weight changes were used to calculate the degradation rate and rate constant. The results were as follows: The molecular weight of chitosans decreased with an increasing ultrasonication time. The curves of the molecular weight versus the ultrasonication time were broken at 1‐h treatment. The degradation rate and rate constant of sonolysis decreased with an increasing ultrasonication time. This may be because the chances of being attacked by the cavitation energy increased with an increasing molecular weight species and may be because smaller molecular weight species have shorter relaxation times and, thus, can alleviate the sonication stress easier. However, the degradation rate and rate constant of sonolysis increased with an increasing DD of the chitosan used. This may be because the flexibilitier molecules of higher DD chitosans are more susceptible to the shear force of elongation flow generated by the cavitation field or due to the bond energy difference of acetamido and β‐1,4‐glucoside linkage or hydrogen bonds. Breakage of the β‐1,4‐glucoside linkage will result in lower molecular weight and an increasing reaction rate and rate constant. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 3526–3531, 2003