超高强度4+3×0.35ST钢丝帘线在全钢载重子午线轮胎带束层中的应用

研究超高强度4+3×0.35ST钢丝帘线的性能,并用其取代3+8×0.33HT钢丝帘线用于全钢载重子午线轮胎带束层。结果表明,与3+8×0.33HT钢丝帘线相比,4+3×0.35ST钢丝帘线具有直径和线密度小、渗胶性能好等优点;将4+3×0.35ST钢丝帘线用于带束层,可在保证成品轮胎各项性能的同时,减小轮胎质量,降低制造成本。     

2＋7×0.35ST钢丝帘线在中短途全钢载重子午线轮胎带束层中的应用

研究2+7×0.35ST钢丝帘线在中短途全钢载重子午线轮胎带束层中的应用。结果表明：与3+8×0.33HT钢丝帘线相比,2+7×0.35ST钢丝帘线的线密度减小8%,直径和破断力基本一致,渗胶性能和粘合力提高;以2+7×0.35ST钢丝帘线代替3+8×0.33HT钢丝帘线用于中短途全钢载重子午线轮胎带束层中,成品轮胎的充气外缘尺寸符合国家标准要求,强度性能和耐久性能提高,实际装车路试轮胎肩空病象明显减少。     

2＋7×0.35ST钢丝帘线在全钢载重子午线轮胎带束层中的应用

研究2+7×0.35ST超高强度钢丝帘线在全钢载重子午线轮胎带束层中的应用。结果表明,与3+8×0.33HT高强度钢丝帘线相比,2+7×0.35ST钢丝帘线在线密度和渗胶性能方面更有优势,以其替代3+8×0.33HT钢丝帘线用于全钢载重子午线轮胎带束层中,在保证轮胎强度和耐久性能的同时,有利于轮胎轻量化,并减少原材料消耗。     

3＋8×0.33ST钢丝帘线在全钢载重子午线轮胎带束层中的应用

研究3+8×0.33ST钢丝帘线在全钢载重子午线轮胎带束层中的应用。结果表明:与3+8×0.33HT钢丝帘线相比,3+8×0.33ST钢丝帘线单位直径强度和刚度大,压延厚度小,以其替代3+8×0.33HT钢丝帘线用于全钢载重子午线轮胎带束层,可以提高成品轮胎的强度和耐久性能,同时可降低生产成本。     

4+3×0.33ST钢丝帘线在全钢载重子午线轮胎带束层中的应用及压延工艺探讨

研究4+3×0.33ST钢丝帘线替代3×0.20+6×0.35HT钢丝帘线在全钢载重子午线轮胎带束层中的应用,重点探讨4+3×0.33ST钢丝帘线的压延工艺。结果表明:与3×0.20+6×0.35HT钢丝帘线相比,4+3×0.33ST钢丝帘线具有线密度低、渗胶性能好、覆胶弯曲刚度高等优点,可以实现等强度、等密度替代,在保证轮胎各项性能的同时,满足轮胎轻量化和降低制造成本的需求;由于4+3×0.33ST钢丝帘线为不规则结构,在压延时需要匹配合适的压力辊和整经辊槽径,避免压延时跳线的发生。     

超高强度3＋3×0.35ST钢丝帘线在全钢载重子午线轮胎带束层中的应用

研究超高强度新型钢丝帘线3+3×0.35ST在全钢载重子午线轮胎带束层中的应用。结果表明,以3+3×0.35ST钢丝帘线替代0.365+6×0.35HT钢丝帘线,轮胎的外缘尺寸符合标准要求,耐久性能提高,同时可减小轮胎质量,降低生产成本。     

2+2×0. 35ST钢丝帘线在半钢轻型载重 子午线轮胎带束层中的应用

研究以2+2×0.35ST钢丝帘线替代2+7×0.28HT钢丝帘线应用于半钢轻型载重子午线轮胎带束层。结果表明:与2+7×0.28HT钢丝帘线相比,2+2×0.35ST钢丝帘线直径和线密度小,压延后钢丝帘布质量小;以2+2×0.35ST钢丝帘线替代2+7×0.28HT钢丝帘线用于带束层试制185R14C 8PR,195R15C 8PR和225/65R16C 8PR半钢轻型载重子午线轮胎,工艺性能良好,成品轮胎的外缘尺寸、强度性能、高速性能和耐久性能均满足相应国家标准和企业标准要求,且单胎质量减小,生产成本降低。     

3+8×0.33HT钢丝帘线在全钢载重汽车子午线轮胎带束层中的应用

研究3+8×0.33HT钢丝帘线在全钢载重汽车子午线轮胎带束层中的应用。结果表明:3+8×0.33HT钢丝帘线替代3+9+15×0.22+0.15钢丝帘线用于全钢载重汽车子午线轮胎带束层,可减小轮胎质量,提高轮胎综合性能,降低轮胎生产成本。     

4＋3×0.33ST钢丝帘线在全钢载重子午线轮胎带束层中的应用

研究4＋3×0.33ST钢丝帘线在全钢载重子午线轮胎带束层中的应用。结果表明：与3×0.20＋6×0.35HT钢丝帘线相比,4＋3×0.33ST钢丝帘线的帘线直径和线密度减小,刚度和覆胶刚度增大;以4＋3×0.33ST钢丝帘线替代3×0.20＋6×0.35HT钢丝帘线用于全钢载重子午线轮胎带束层中,工艺性能和胶料的渗透性能较好,成品轮胎的耐久性能提高,同时可降低原材料成本。     

2＋2×0.32ST超高强度钢丝帘线在半钢子午线轮胎带束层中的应用

研究2+2×0.32ST钢丝帘线替代2+2×0.35HT钢丝帘线在半钢子午线轮胎带束层中的应用。结果表明:与2+2×0.35HT钢丝帘线相比,2+2×0.32ST钢丝帘线的强度更高、直径更小、耐疲劳性能更好;在轮胎带束层中用2+2×0.32ST钢丝帘线替代2+2×0.35HT钢丝帘线后,工艺性能良好,成品轮胎的充气外缘尺寸变化不大,强度性能、高速性能、耐久性能和耐水压性能均能满足设计和国家标准要求,滚动阻力降低,同时有效减小了轮胎中的钢丝帘线和胶料用量,降低了生产成本。     

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