共查询到20条相似文献,搜索用时 78 毫秒
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建立了紫外分光光度法测定胎圈钢丝涂层中古马隆树脂含量的方法,使用环己烷作为溶剂,将胎圈钢丝样品涂层中古马隆树脂提取出来,在最大吸收波长260nm处测定样品溶液的吸光度,采用外标法定量,测定了5个胎圈钢丝样品表层涂层中古马隆树脂的含量。该方法在15.1~302.8μg/mL浓度范围内线性关系良好(R~2=0.9999),样品加标回收率为90.2%~108.1%,相对标准偏差小于2.0%。将该5个胎圈钢丝样品与胎圈钢丝粘合胶制样硫化,获得测定橡胶与胎圈钢丝粘合力的样品,通过钢丝抽出试验的方法,测得粘合力平均值分别为:518N,415N,469N,513N,787N。得出胎圈钢丝粘合力值与涂层中古马隆树脂含量的关系为:相同品牌相同规格胎圈钢丝,随着涂层中古马隆树脂含量的升高,钢丝与橡胶的粘合力值增加。 相似文献
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《化学与粘合》2021,43(1)
胎圈钢丝成品生产线以中频回火取代传统的铅浴回火工艺。对中频回火胎圈钢丝生产工艺中影响粘合性能的关键工序进行分析。介绍了电解碱洗和电解酸洗的原理和影响因素,并分析考查了Φ0.95mm、Φ1.30mm、Φ1.65mm三种直径胎圈钢丝在15~35A/dm2电流密度下电解酸洗的粘合力,结果分别在30、20、25A/dm2时粘合力最高;考查了化镀锡青铜镀液组分浓度与镀层锡质量分数的关系,研究了Φ0.95mm HT高锡胎圈钢丝在不同生产工艺下的粘合性能及Φ1.65mm低锡胎圈钢丝镀层质量对粘合力的影响,结果表明,中频回火工艺将镀液调整至硫酸浓度45g/L、温度40℃有利于提高Φ0.95mm HT的粘合性能,Φ1.65mm与某轮胎企业橡胶的粘合力随着镀层重量的增大而提高;介绍了镀后处理的作用和目前涂层液开发情况。经实验研究,通过调整和控制以上关键工序的工艺条件,能进一步提升中频回火胎圈钢丝与橡胶之间的粘合力。 相似文献
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轮胎胎圈不仅应尺寸稳定并要能承受一定的负荷。轮胎是动态的安全产品 ,特别是在汽车载荷很大或高速转向时 ,轮胎胎圈和胎圈单边受力(径向力和侧向力 )非常大。如果组成胎圈的骨架材料———单根钢丝与橡胶粘合性不好 ,则易造成胎圈钢丝松散 ,从而导致轮胎爆破。因此 ,胎圈钢丝除了断裂强度以外 ,其与橡胶的粘合性能也应受到特别的重视。现就抽出法测定硫化胶与单根钢丝粘合力的若干技术问题讨论如下。1 试验原理将单根钢丝按规定长度包埋在橡胶块中进行硫化 ,然后在材料试验机 (拉力机 )上测定每根钢丝沿钢丝轴向从橡胶块中抽出时所需要的… 相似文献
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粘合增进剂AIR-101在航空轮胎胎圈钢丝包胶中的应用 总被引:1,自引:0,他引:1
考察新型粘合增进剂AIR-101在航空轮胎胎圈钢丝包胶中的应用情况。结果表明,在航空轮胎胎圈钢丝包胶中直接加入粘合增进剂AIR-101,胎圈钢丝包胶与胎圈钢丝热空气老化前后的粘合力均明显提高,同时胎圈钢丝包胶的耐热空气老化性能提高;采用粘合增进剂AIR-101减量替代粘合剂RS和A,并调整硬脂酸用量,相应胎圈钢丝包胶与胎圈钢丝热空气老化后的粘合力显著提高。以最优配方试制的航空轮胎经动态模拟试验及静态性能检验,性能良好。 相似文献
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针对全钢子午线轮胎胎圈钢丝生产过程中出现的钢丝露铜和钢丝散线两种质量缺陷,对胎圈钢丝覆胶配方进行调整,采用增粘树脂Koresin减量替代C9石油树脂,并采用不溶性硫黄OT-20。结果表明,对胎圈钢丝覆胶配方进行改进,可以彻底解决使用原配方胎圈钢丝覆胶在胎圈钢丝成型过程中存在的露铜、散线问题,成品轮胎的胎圈耐久性能提高。 相似文献
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钢丝帘线/橡胶界面的粘合层对改善粘合性能和保持轮胎稳定性的作用已得到广泛关注。近几十年来,对镀黄铜钢丝帘线粘合性能及其帘线/橡胶界面开展了很多研究。然而,对镀青铜胎圈钢丝粘合和橡胶界面方面研究很少。 相似文献
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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。 相似文献
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D. G. Gordeev L. F. Gudarenko M. V. Zhernokletov V. G. Kudel’kin M. A. Mochalov 《Combustion, Explosion, and Shock Waves》2008,44(2):177-189
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.
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Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 2, pp. 61–75, March–April, 2008. 相似文献
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Jorge Marcelo Romero Soledad Bustillo Hugo Enrique Ramirez Maisuls Nelly Lidia Jorge Manuel Eduardo Gómez Vara Eduardo Alberto Castro Alicia H. Jubert 《International journal of molecular sciences》2007,8(7):688-694
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. 相似文献
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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 相似文献
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醋酸纤维素取代基分布与性质的关系 总被引:9,自引:0,他引:9
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。 相似文献
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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 相似文献