国产均匀剂烃类树脂混合物RH-100在无内胎全钢载重子午线轮胎气密层胶中的应用

研究国产均匀剂烃类树脂混合物RH-100在无内胎全钢载重子午线轮胎气密层胶中的应用。结果表明：国产均匀剂烃类树脂混合物RH-100与进口均匀剂烃类树脂混合物的官能团组成相近;在气密层胶中用国产均匀剂烃类树脂混合物RH-100等量替代进口均匀剂烃类树脂混合物,胶料的密度、拉伸性能、撕裂强度、弹性、耐屈挠龟裂性能和气密性能相当,成本降低,工艺性能满足生产要求。国产均匀剂烃类树脂混合物RH-100可推广应用。     

均匀剂RH-100在全钢载重汽车子午线轮胎气密层胶中的应用

研究采用国产均匀剂RH-100等量替代进口均匀剂UB4000对全钢载重汽车子午线轮胎气密层胶性能的影响。结果表明：采用2种均匀剂胶的性能基本相当,国产均匀剂RH—100可以替代进口均匀剂UB4000用于全钢载重汽车子午线轮胎气密层胶中。     

预硫化对全钢载重子午线轮胎性能的影响

采用CNE-500型电子束辐照装置对12R22.5全钢载重子午线轮胎内衬层过渡层胶进行预硫化，研究预硫化技术对全钢载重子午线轮胎性能的影响。结果表明，使用剂量为50 kGy电子束辐照后，成品轮胎动平衡、均匀性和耐久性能均有所提升，高速性能相当，胎肩部位过渡层胶渗透程度有所改善。     

全钢载重子午线轮胎带束层结构对接地性能的影响

以295/75R22.5 18PR无内胎全钢载重子午线轮胎为例,研究带束层结构对轮胎接地性能的影响。在轮廓相同时,带束层结构不同,轮胎接地性能差异较大。在其它施工条件不变时,3层半带束层加零度带束层结构的无内胎全钢载重子午线轮胎肩部接地压力较小,耐久性能好,抗冠部爆破性能、速度性能和通过性能佳;4层带束层结构无内胎全钢载重子午线轮胎接地印痕趋于矩形,平均接地压力较小,肩部接地压力较大,耐磨性能、操控性能、胎圈耐久性能和安全性能好。     

无内胎全钢载重子午线轮胎三角胶构成对胎圈耐久性能的影响

以12R22.5无内胎全钢载重子午线轮为例,研究无内胎全钢载重子午线轮胎三角胶软质胶与硬质胶体积比和组成结构对胎圈耐久性能的影响。结果表明:三角胶软质胶/硬质胶体积比为3∶1时,胎体帘布端点的应变化能较小,胎圈耐久性能较好。     

12R22.5无内胎全钢载重子午线轮胎胎圈损坏原因分析及解决措施

以12R22.5无内胎全钢载重子午线轮胎为例,介绍无内胎全钢载重子午线轮胎胎圈部位的损坏形式,分析其产生原因,提出解决措施,并试制成品轮胎进行试验验证。结果表明,通过采取使用复合三角胶、增强骨架材料的性能和优化轮胎结构设计等措施,可以有效改善胎圈性能,延长轮胎使用寿命。     

国内外全钢载重子午线轮胎使用钢丝的差异

根据国内外全钢载重子午线轮胎剖析结果讨论国内外全钢载重子午线轮胎使用钢丝的差异。对于无内胎全钢载重子午线轮胎,国外厂家大都采用密集型钢丝帘线作为胎体帘线,钢丝帘线直径都比较小,且比较柔软,但钢丝帘线密度较大;国内外厂家都采用了4层带束层结构,带束层钢丝帘线直径普遍较大。对于有内胎全钢载重子午线轮胎,国内厂家轮胎胎体使用最多的是3＋9＋15钢丝帘线,带束层多采用3层带束层结构,以3＋9＋15钢丝帘线为主,配合一些高抗冲击、高伸长钢丝帘线;国外厂家仍以采用4层带束层结构为主。国内外全钢载重子午线轮胎胎圈钢丝直径都比较大,且多采用六角形钢丝圈,其中无内胎轮胎采用斜六角形钢丝圈的较多,有内胎轮胎采用正六角或扁六角形钢丝圈的居多。     

纳米氧化锌在全钢载重子午线轮胎气密层中的应用

研究纳米氧化锌替代普通氧化锌在无内胎全钢载重子午线轮胎气密层中的应用。结果表明:在气密层胶中以2.1份纳米氧化锌替代3.5份普通氧化锌,胶料的焦烧时间和t90延长;硫化胶的物理性能变化不大,气密性能基本相当,气密层胶与过渡层胶的粘合性能较好;成品轮胎的耐久性能达到国家标准要求,且生产成本降低。     

再生丁基橡胶在无内胎全钢载重子午线轮胎气密层胶中的应用

研究再生丁基橡胶在无内胎全钢载重子午线轮胎气密层胶中的应用。结果表明:添加20份再生丁基橡胶后,气密层胶的拉伸性能和渗透系数变化不大,耐热氧老化性能有所提高;成品轮胎平均每月的漏气率降至1.9%;混炼胶成本降低了1.58元·kg~(-1)。     

电子束辐照预硫化在全钢载重子午线轮胎生产中的应用

介绍高能电子束辐照预硫化在全钢载重子午线轮胎生产中的应用。结果表明：利用高能电子束辐照能使全钢载重子午线轮胎内衬层中的过渡层表面形成交联预硫化,达到增韧效果;辐照后的内衬层可以有效避免胶料向胎体中渗透,适当减小过渡层厚度,可以节约成本,同时减小胶料生热,提升轮胎性能。     

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