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。     

国产稀土顺丁橡胶在全天候轮胎和冬季轮胎胎面胶中的应用研究

研究两种国产稀土顺丁橡胶(Nd BR)Nd-40和Nd-60分别在全天候轮胎和冬季轮胎胎面胶中的应用性能,并与传统镍系顺丁橡胶(BR9000)进行对比。结果表明:与BR9000相比,两种Nd BR与填料的结合能力较好,加工工艺性能可满足现场生产要求;两种Nd BR硫化胶的综合物理性能和耐热老化性能较优,抗湿滑性能相近,滞后损失小,生热低,成品轮胎的高速和耐久性能均符合产品设计要求;在全天候轮胎胎面胶中加入Nd-40,硫化胶的耐磨性能提高,成品轮胎的滚动阻力降低。     

低滚动阻力全钢载重子午线轮胎胎面胶配方的研究

研究低滚动阻力全钢载重子午线轮胎胎面胶的配方和性能。结果表明：主体材料采用天然橡胶（NR）/顺丁橡胶（BR）/溶聚丁苯橡胶（SSBR）并用,减小炭黑用量,增大高分散性白炭黑用量,胎面胶的混炼工艺和挤出工艺性能优良,耐磨性能明显提高,生热明显降低,抗湿滑性能提高,滚动阻力大幅下降;成品轮胎的耐久性能提升,滚动阻力降低。     

钕系顺丁橡胶在半钢子午线轮胎胎面胶中的应用

研究钕系顺丁橡胶(BR)在半钢子午线轮胎胎面胶中的应用。结果表明,用牌号为CB24的钕系BR等量替代BR9000,胶料的耐磨性能和抗撕裂性能提高,生热减小,成品轮胎的制动性能提高,滚动阻力降低,符合轮胎节能、降耗的环保要求,轮胎性能大幅提高。     

高乙烯基聚丁二烯橡胶在高性能半钢子午线轮胎胎面胶中的应用

研究高乙烯基聚丁二烯橡胶(HVBR)等量部分替代溶聚丁苯橡胶(SSBR)或天然橡胶(NR)在高性能半钢子午线轮胎胎面胶中的应用。结果表明:HVBR等量部分替代NR用于轮胎胎面胶,其拉伸强度、撕裂强度、拉断伸长率、弹性和耐压缩疲劳性能均得以改善,但其耐磨性能、动态生热性能及滚动阻力性能均变差;HVBR等量部分替代SSBR用于轮胎胎面胶,可在保证高抗湿滑性能的同时,提高胶料的力学强度、硬度、耐压缩疲劳性能和耐磨性能,并降低动态生热、滚动阻力和密度,满足"绿色轮胎"的节能和高性能轮胎的性能要求。成品轮胎测试结果表明,相比于生产配方轮胎,采用HVBR等量部分替代SSBR胎面胶的轮胎耐磨性能略好,动力性能较好,滚动阻力、高速和耐久性能、干地操控性能和经济性相当。     

载重斜交轮胎胎面胶配方的改进

对载重斜交轮胎胎面胶配方进行改进。通过减小NR用量，增大BR9000用量，以白炭黑部分替代炭黑，可改善炭黑的分散性，提高胶料的耐压缩疲劳性能和耐磨性能，有利于消除胎面胶在实际使用中出现的崩花、掉块现象，降低滚动阻力和生热，提高成品轮胎的速度性能和耐久性。     

超细全硫化粉末丁苯橡胶对胎面胶性能的影响

研究超细全硫化粉末丁苯橡胶（UFPSBR）对天然橡胶（NR）/丁苯橡胶/顺丁橡胶（BR）胎面胶性能的影响。结果表明：与未加UFPSBR的胎面胶相比,加入2～3份UFPSBR的NR/溶聚丁苯橡胶/BR胎面胶拉伸强度略有减小,耐磨性能和抗湿滑性能提高,生热降低;加入1～2份UFPSBR的NR/乳聚丁苯橡胶/BR胎面胶拉伸强度增大,抗湿滑性能略有提高,滚动阻力变化不大,耐磨性能下降。     

低滚动阻力载重子午线轮胎配方的开发

通过调整配方组分开发低滚动阻力载重子午线轮胎胎面胶、胎肩垫胶和胎侧胶配方。结果表明:与相应参比配方相比,试验配方胎面胶耐磨性能提高,生热降低;胎肩垫胶弹性提高,生热降低;胎侧胶拉伸强度和拉断伸长率降低,耐屈挠龟裂性能提高,其他性能变化不大;与参比轮胎相比,试验轮胎滚动阻力系数降低了9.3%,达到美国环保署SmartWay认证要求,耐久性能较优,实际路试中耐磨性能略优。     

双相炭黑在全钢载重子午线轮胎胎面胶中的应用

试验研究双相炭黑CRX2125在全钢载重子午线轮胎胎面胶中的应用。结果表明,在胎面胶中以双相炭黑CRX2125等量替代炭黑N134,胶料物理性能基本保持不变,生热和滚动阻力降低,耐磨性能下降;成品轮胎耐久性能提高,胎冠生热降低,生产成本略微增大,轮胎燃油经济性大幅提高。     

碳-硅双相填料在载重轮胎胎面胶中的应用

研究碳-硅双相填料(CSDPF)在载重轮胎胎面胶中的应用。结果表明:在胎面胶中加入CSDPF,胶料的门尼粘度和MH增大,硫化胶的硬度和定伸应力增大,60℃时的损耗因子减小,压缩生热降低,回弹值增大,耐磨性能提高;成品轮胎的滚动阻力降低,耐久性能提高,耐磨性能相近。     

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     

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。     

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