热稳定剂HS-80对航空轮胎胶料性能的影响

试验研究热稳定剂HS-80对航空轮胎胶料性能的影响。结果表明,在航空轮胎胶料中加入热稳定剂HS-80,可以改善胶料的操作安全性,提高硫化速度和抗硫化返原性能,降低生热,提高硫化胶的物理性能、耐热空气老化性能、耐磨性能、耐屈挠龟裂性能及炭黑分散性。     

热稳定剂HS-80在载重斜交轮胎胎面胶中的应用

试验研究热稳定剂HS-80在载重斜交轮胎胎面胶中的应用.结果表明,在载重斜交轮胎胎面胶中加入热稳定剂HS-80,胶料的t10延长,硫化速度减慢;硫化胶的拉伸强度、300%定伸应力和撕裂强度增大,耐磨性能提高,生热降低,耐老化性能改善;成品轮胎的耐久性能提高.     

抗硫化返原剂SL-9009在全钢巨型工程机械子午线轮胎基部胶中的应用

研究抗硫化返原剂SL-9009在全钢巨型工程机械子午线轮胎基部胶中的应用。结果表明:在基部胶中加入1份抗硫化返原剂SL-9009,可以提高胶料的抗硫化返原性、物理性能和耐磨性能,降低压缩生热,改善炭黑分散性,减少脱层现象,延长轮胎使用寿命。     

热稳定剂HS-80在载重轮胎胎肩胶中的应用

研究热稳定剂HS-80在载重轮胎胎肩胶中的应用。结果表明:添加热稳定剂HS-80的胎肩胶抗硫化返原性能明显提高,拉伸性能、弹性和耐热老化性能改善,特别是硫化时间较长(>50 min)的胶料该趋势更明显;添加热稳定剂HS-80的胎肩胶制备的成品轮胎耐久性能和高速性能提高,肩空率降低。     

热稳定剂HS-80在轮胎胎面胶中的应用

研究热稳定剂HS-80在轿车子午线轮胎、全钢载重子午线轮胎和工程机械轮胎胎面胶中的应用。结果表明:加入热稳定剂HS-80,胶料的门尼粘度明显减小,挤出工艺性能明显改善,硫化特性总体变化不大;硫化胶的300%定伸应力、拉伸强度、撕裂强度提高,压缩疲劳温升降低,耐磨性能、耐疲劳性能和耐热性能改善;成品轮胎的高速性能和耐久性能好。     

热稳定剂HS-80在全钢载重子午线轮胎三角胶中的应用

试验研究热稳定剂HS-80在全钢载重子午线轮胎三角胶中的应用效果.结果表明,加入热稳定剂HS-80,可以改善胶料的加工安全性,提高胶料的分散性及硫化胶的物理性能、耐老化和耐疲劳性能,降低生热,提高成品轮胎的胎圈耐久性能.     

耐热硫化活性剂SL—273的应用研究

研究了锌皂类耐热硫化活性剂SL-273在天然橡胶中的应用效果。结果表明：在配方中使用SL-273,胶料的抗硫化返原性良好,并能有效提高抗热氧老化性能。     

抗硫化返原剂WK901在矿山轮胎胎面胶中的应用

研究抗硫化返原剂WK901在矿山轮胎胎面胶中的应用。结果表明,在矿山轮胎胎面胶中加入抗硫化返原剂WK901对胶料的加工安全性无不利影响,可以明显提高胶料的抗硫化返原性能,同时不降低胶料的物理性能。     

加工助剂A-78的基本特性及应用研究

摘要：通过测定胶料的门尼粘度、焦烧时间、硫化曲线、物理性能考察了加工助剂A-78对炭黑填充NR胶料和汽车胎面胶的流动性、加工安全性、硫化返原性及300％定伸应力、拉伸强度等物理机械性能的研究。试验结果表明，加工助剂A-78可以降低胶料的门尼粘度，提高混炼胶料的均匀性及塑性，改善NR胶料的抗硫化返原性，随着加工助剂A-78用量的增加抗硫化返原效果更加明显，胶料的焦烧时间和正硫化时间略有延长，加入加工助剂A-78后不影响胶料物理机械性能。     

抗硫化返原剂WK-901在工程机械轮胎胎面胶中的应用

介绍抗硫化返原剂WK-901在工程机械轮胎胎面胶中的应用。结果表明:在工程机械轮胎胎面胶中加入0.75份抗硫化返原剂WK-901,胶料的拉伸强度、拉断伸长率和撕裂强度增大,抗硫化返原性能和耐热老化性能显著提高,成品轮胎的使用寿命明显延长。     

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。     

Semi-empirical equation of state of metals. Equation of state of aluminum

A semi-empirical equation of state for metals is described. Its capabilities are demonstrated by the example of the equation of state for aluminum. New experimental data are presented on the location of the isentrope of aluminum for unloading from the state at p = 229.71 GPa on the shock adiabat to an aerogel (SiO₂) of density 0.08 g/cm³. __________ Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 2, pp. 61–75, March–April, 2008.     

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。     

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。     

我国聚碳酸酯工业发展概况

介绍我国聚碳酸酯生产能力和消费需求,对聚碳酸酯在信息工业中的应用作了简短介绍     

Calorimetric and Computational Study of Enthalpy of Formation of Diperoxide of Cyclohexanone

A thermochemical rather simple experimental technique is applied to determine the enthalpy of formation of Diperoxide of ciclohexanone. The study is complemented with suitable theoretical calculations at the semiempirical and ab initio levels. A particular satisfactory agreement between both ways is found for the ab initio calculation at the 6–311G basis This set level. Some possible extensions of the present procedure are pointed out.     

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     

气化给煤系统故障分析

气化给煤装置自投运以来,出现了气化煤仓堵煤、称重给煤机输送皮带因跑偏而损伤以及清扫装置故障频繁等问题,多次造成气化系统减负荷运行。通过对出现的各种问题进行分析,找到了产生这些问题的原因,并有针对性地采用配煤和改进清扫链等措施,使出现的问题得到了极大的改善。     

醋酸纤维素取代基分布与性质的关系

分析了以吡啶为溶剂的醋酸纤维素的13C-NMR核磁共振谱,得出了三种不同位置羟基的取代度。结合X—射线和DSC分析,初步说明具有相同取代度但未经水解和经过水解的醋酸纤维素(CA) 性质上的差异是由于三个羟基上的取代度分布不同及消晶程度差异所致。     

Generalization of vdW type of equations of state

1 INTRODUCTIONBecause of importance of equations of state (EOS)in science and industry,hundreds forms of EOS havebeen presented since latter 19th century.It seems impossible to develop a general equation covering vari-ous kinds of EOS.But for cubic EOS,several generalequations have been reported already. Martin presented the first general equation whichis following p=RT/V-α(T)/(υ β)(υ γ) δ(T)/υ(υ β)(υ γ) (1) Kumar et a1.presented an equation called the most general form of a density-cubic or, alterna tively,volume-cubic mathematical equation,the form of which is as follows