抗硫化返原剂在天然橡胶中的应用研究

研究抗硫化返原剂WY808,WK901,WY9188,HT-K在全天然橡胶体系配方中的应用,对比其抗硫化返原效果。结果表明:在4种抗硫化返原剂中,抗硫化返原剂WY9188和WK901的抗硫化返原效果具有明显优势;抗硫化返原剂WY9188在硫化返原后期和整体阶段的抗硫化返原效果较好;抗硫化返原剂WK901在硫化返原前期的抗硫化返原效果优良;4种抗硫化返原剂均能改善过硫化状态硫化胶的物理性能;在0. 5～1. 5份用量范围内,抗硫化返原剂WK901的最佳用量为1. 5份,抗硫化返原剂WY808的最佳用量为1份。抗硫化返原剂WK901,WY808,HT-K可以直接添加,不需要对原硫化体系进行调整。使用抗硫化返原剂WY9188时需要适当减小促进剂用量。     

抗硫化返原剂在全钢载重子午线轮胎胎面胶中的应用试验

研究4种抗硫化返原剂在全钢载重子午线轮胎胎面胶中的应用。结果表明:添加多功能交联剂WY988胶料的硫黄用量减小,加工安全性能、抗硫化返原性能、物理性能和耐磨性能好,生热低,弹性模量(G′)大;添加抗硫化返原剂WK901,PK900和VIVA77胶料的抗硫化返原性能依次降低,G′依次减小;添加抗硫化返原剂对胶料滚动阻力影响不大。     

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。     

交联剂WY988在天然橡胶胶料中的应用研究

采用全钢载重子午线轮胎胎面基部胶配方,考察国产交联剂WY988对天然橡胶(NR)胶料性能的影响,并与国外同类产品交联剂KA9188进行对比。结果表明:分别采用交联剂WY988与KA9188部分替代促进剂NS的胶料硫化速度快,交联密度和定伸应力大;采用交联剂WY988的胶料与采用KA9188的胶料硫化特性、抗硫化返原性能和物理性能基本相当;交联剂WY988对降低胶料生热的作用比交联剂KA9188大。     

多功能交联剂WY9188、HV-268、WK901对TBR胎面胶性能的影响

本文主要研究了多功能交联剂WY9188、HV-268、WK901对TBR胎面胶性能的影响。结果表明,多功能交联剂的加入一定程度上可改善胶料的抗硫化返原性能、物理机械性能、滚动阻力以及磨耗性能,其中,WY9188作为一种新型的多功能交联剂具有较为突出的综合优势,在填加量为0.5phr时胶料具有较好的力学性能并且能很好地平衡轮胎抗湿滑性、滚动阻力和磨耗特性。     

抗硫化返原剂WK901在全钢载重子午线轮胎中的应用

研究抗硫化返原剂WK901在全钢载重子午线轮胎上三角胶中的应用效果，并与抗硫化返原剂Perkalink 900(简称PK900)进行对比。结果表明，与PK900一样，加入WK901可明显提高胶料的抗硫化返原性。同时对胶料的加工安全性、硫化速率没有影响；两种抗硫化返原剂对硫化胶物理性能的影响基本相同；WK901用量在0．7份时胶料的综合性价比最优。     

国产抗硫化返原剂WK901的性能研究

研究国产抗硫化返原剂WK901的性能，并与进口同类产品进行对比。结果表明，国产抗硫化返原剂WK901具有优异的抗硫化返原性能，对胶料的硫化特性和硫化胶的物理性能无明显影响，与进口同类产品性能相近，可用于轮胎实际生产。     

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。     

抗硫化返原剂ZD-5在工程机械轮胎胎面胶中的应用

试验研究抗硫化返原剂ZD-5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抗硫化返原剂ZD-5,可以降低胶料的门尼粘度,延长门尼焦烧时间和t90,改善胶料的抗硫化返原性能,提高硫化胶的硬度、300%定伸应力和耐疲劳性能,成品轮胎胎面胶的物理性能超过国家标准要求.     

抗硫化返原剂PK900在工程机械轮胎胎面胶中的应用

研究抗硫化返原剂PK900在工程机械轮胎胎面胶中的应用。结果表明:在胎面胶中加入抗硫化返原剂PK900,在正硫化条件下,胶料的硫化特性和物理性能变化不大;在过硫化条件下,胶料的抗硫化返原性能明显改善,硫化胶的物理性能和耐磨性能提高,压缩生热降低。     

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