模量增强剂HMZ在轮胎三角胶中的应用

探讨模量增强剂HMZ在斜交轮胎三角胶中的应用。结果表明,采用3份模量增强剂HMZ替代4份烷基酚醛补强树脂BQ-2,胶料的混炼和挤出工艺性能改善,硫化特性、硬度、定伸应力、拉伸强度、撕裂强度和耐热老化性能变化不大,拉断伸长率略有增大,H抽出力显著增大;成品轮胎的耐久性能达到国家标准要求,生产成本降低。     

模量增强剂HMZ在工程机械轮胎胎面胶中的应用

将模量增强剂HMZ应用于工程机械轮胎胎面上层胶中 ,进行小配合和车间大料及成品轮胎试验。结果表明 ,在胎面上层胶中加入 2份模量增强剂HMZ ,硫化胶的邵尔A型硬度提高 3～ 4度 ,同时 30 0 %定伸应力、撕裂强度略有提高 ,而其它性能无明显变化     

模量增强剂HMZ在载重轮胎胎面胶中的应用

研究了模量增强剂HMZ在载重轮胎胎面胶中的应用效果。试验结果表明，在载重轮胎胎面胶中加入1．5份模量增强剂HMZ，可改善胶料的加工工艺性能，增大硫化胶的300％定伸应力和邵尔A型硬度，减小扯断永久变形和固特里奇生热，提高耐热性、耐磨性以及轮胎成品性能。     

模量增强剂8180在全钢子午线轮胎胎肩垫胶中的应用

研究模量增强剂8180在全钢子午线轮胎胎肩垫胶中的应用。结果表明：在胎肩垫胶中添加1.5份模量增强剂8180,胶料的门尼焦烧时间和正硫化时间缩短,最大转矩增大;硫化胶的拉伸强度增大,压缩生热降低;成品轮胎的耐久性能提高。     

模量增强剂HMZ在轮胎胎面胶和缓冲胶中的应用

研究了模量增强剂HMZ在轮胎胎面胶和缓冲胶中的应用效果。试验结果表明 ,在胎面胶中加入 1 5份模量增强剂HMZ ,不改变其它组分用量 ;在缓冲胶中加入 2份模量增强剂HMZ ,适当减小炭黑用量 ,可增大硫化胶的3 0 0 %定伸应力、邵尔A型硬度和回弹值 ;胶料的门尼粘度有所下降 ,包辊性好 ,挤出和压延性能有所改善。试制的成品轮胎 6.5 0 -1610PR的耐久性达到 15 5 4h ,速度性能达到 13 0km·h- 1 。     

模量增强剂8180在缺气保用轮胎支撑胶中的应用

研究模量增强剂8180在缺气保用轮胎支撑胶中的应用。结果表明:加入模量增强剂8180后,胶料的门尼粘度和F_max增大,定伸应力提高,拉伸强度和拉断伸长率变化不大,动态生热明显下降,动态模量提高;成品轮胎的零气压耐久性能提高。     

模量增强剂HMZ对天然橡胶/顺丁橡胶并用胶性能的影响

研究模量增强剂HMZ的掺合温度和用量对天然橡胶(NR)/顺丁橡胶(BR)并用胶性能的影响。结果表明:模量增强剂HMZ具有迟延硫化作用,并能显著改善胶料的硫化平坦性;模量增强剂HMZ适宜的掺合温度为130℃左右;随着模量增强剂HMZ用量增大,NR/BR并用胶的邵尔A型硬度提高,模量增强剂HMZ用量为7份时定伸应力最大;模量增强剂HMZ的适宜用量为2~7份。     

工程机械斜交轮胎水胎胶的配方优化

对工程机械斜交轮胎水胎胶的配方进行优化。结果表明:通过调整水胎胶配方中的生胶体系、补强填充体系和硫化体系,胶料的抗硫化返原性能提高,硫化胶的300%定伸应力、拉断永久变形和撕裂强度减小,拉断伸长率和回弹值增大,耐热老化性能提高;水胎的使用寿命延长,胶料成本降低。     

空气阻止剂NM360在工程机械轮胎中的应用

研究空气阻止剂NM360在工程机械轮胎胎侧胶和内层帘布胶中的应用。结果表明,以空气阻止剂NM360替代工程机械轮胎胎侧胶中的再生橡胶和内层帘布胶中的纳米碳酸钙,胶料的拉伸强度和拉断伸长率提高,加工性能改善,成品轮胎性能良好,生产成本降低。     

热稳定剂YG在无印痕实心轮胎中的应用

研究热稳定剂YG在无印痕实心轮胎中的应用。结果表明：加入热稳定剂YG的胶料的门尼粘度略微降低,胶料的分散性、挤出性能和流动性改善,满足实际生产工艺要求;与生产配方硫化胶相比,加入热稳定剂YG的试验配方硫化胶的拉伸强度和拉断伸长率增大,耐屈挠龟裂性能和耐磨性能提高,压缩屈挠温升减小,热氧老化后拉伸强度变化率和拉断伸长率变化率减小,试验配方硫化胶的物理性能更优异;生产和试验配方成品轮胎的耐久性能相当,且采用试验配方生产无印痕实心轮胎在行驶过程中无印痕、变色轻、磨损减轻,有利于延长轮胎的使用寿命。     

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