共查询到20条相似文献,搜索用时 78 毫秒
1.
2.
基于半钢子午线轮胎胎面胶配方,将两种高门尼粘度钕系顺丁橡胶(NdBR){记为NdBR-1#和NdBR-2#,门尼粘度[ML(1+4)100 ℃]分别为67和72,相对分子质量分布指数分别为3.26和2.31}与溶聚丁苯橡胶(SSBR)和天然橡胶(NR)并用,并与镍系顺丁橡胶(牌号BR9000)和NdBR(牌号CB22)作对比,研究高门尼粘度NdBR/SSBR/NR胎面胶的性能。结果表明:在BR/SSBR/NR三胶并用时,高门尼粘度NdBR的应用优势较明显;NdBR-2#胶料的综合性能优于NdBR-1#胶料,物理性能、滚动阻力及动态力学性能相当,抗裂口增长性能、抗切割性能和耐老化性能尤其突出,明显优于CB22胶料。NdBR-2#更适用于BR/SSBR/NR并用体系。 相似文献
3.
研究超细全硫化粉末丁苯橡胶(UFPSBR)对天然橡胶(NR)/丁苯橡胶/顺丁橡胶(BR)胎面胶性能的影响。结果表明:与未加UFPSBR的胎面胶相比,加入2~3份UFPSBR的NR/溶聚丁苯橡胶/BR胎面胶拉伸强度略有减小,耐磨性能和抗湿滑性能提高,生热降低;加入1~2份UFPSBR的NR/乳聚丁苯橡胶/BR胎面胶拉伸强度增大,抗湿滑性能略有提高,滚动阻力变化不大,耐磨性能下降。 相似文献
4.
研究不同结构顺丁橡胶(BR)[镍系BR(NiBR)牌号9000,钕系BR(NdBR)牌号CB24,SKD-NdII,Nd22EZ和Nd24EZ]对BR/溶聚丁苯橡胶(SSBR)并用胶性能的影响。结果表明:5种牌号BR的顺式1,4-结构摩尔分数基本一致(约为0. 96);采用NiBR的硫化胶性能与采用NdBR的硫化胶无明显差别,甚至部分性能略优;采用CB24的硫化胶物理性能、耐疲劳裂纹扩展性能和抗切割性能较好,抗湿滑性能优良,但滚动阻力较大;采用Nd24EZ的硫化胶撕裂强度较大,裂纹扩展速率较小;采用Nd22EZ的硫化胶抗湿滑性能较好,滚动阻力较小;采用Nd22EZ与Nd24EZ的硫化胶中白炭黑的分散性较好。 相似文献
5.
不同苯乙烯含量的充油溶聚丁苯橡胶在高性能轮胎胎面胶中的应用 总被引:1,自引:1,他引:0
以溶聚丁苯橡胶(SSBR)Buna VSL 5025-1和2438-2HM、乳聚丁苯橡胶(ESBR)1712和1721并用BR9000为基体,以炭黑和白炭黑为补强剂,对比研究几种胶料的硫化特性、物理性能、动态力学性能、耐磨性能和抗湿滑性能。结果表明:与ESBR1712和1721胶料相比,炭黑或白炭黑填充SSBR Buna VSL 5025-1和2438-2HM胶料的操作安全性、耐磨性能、抗湿滑性能较好;白炭黑填充SSBR Buna VSL 5025-1和2438-2HM胶料的滚动阻力较小、耐热老化性能较差,炭黑填充SSBR Buna VSL 5025-1和2438-2HM胶料的滚动阻力较大、耐热老化性能较好。 相似文献
6.
研究了改性松香树脂用量对溶聚丁苯橡胶(SSBR)/顺丁橡胶(BR)并用胶硫化性能、物理机械性能、抗湿滑性能及动态力学性能的影响。结果表明,随着改性松香树脂用量的增加,SSBR/BR硫化胶的邵尔A硬度、100%定伸应力、300%定伸应力及回弹率逐渐降低,拉伸强度、扯断伸长率、撕裂强度、磨耗及压缩疲劳温升逐渐增加。并且随着改性松香树脂用量的增加,SSBR/BR胶料的湿摩擦系数逐渐增大,接触角逐渐减小,增加了胶料与路面的湿接触面积。同时,改性松香树脂在胶料中分相,硫化胶的损耗因子峰值提高,玻璃化转变温度向高温方向移动,提高了硫化胶0℃时的损耗因子,而不影响60℃时的损耗因子,使得SSBR/BR胶料在抗湿滑性能提高的同时,基本不影响其滚动阻力。 相似文献
7.
8.
9.
以环保充油乳聚丁苯橡胶SBR1723作对比,研究环保充油溶聚丁苯橡胶T2830在轮胎胎面胶中的应用。结果表明:与SBR1723/天然橡胶(NR)/顺丁橡胶(BR)胶料相比,T2830/NR/BR胶料的起硫速度略快、硫化速度略慢;拉断伸长率和撕裂强度较高,硬度、定伸应力和拉伸强度相当;抗湿滑和抗干滑性能相当,干操控性能略差。采用T2830/NR/BR胎面胶的轮胎高速性能、耐久性能和滚动阻力与采用SBR1723/NR/BR胎面胶的轮胎相当。T2830可以替代SBR1723用于轮胎胎面胶。 相似文献
10.
介绍不同牌号乳聚丁苯橡胶的性能特点及应用.SBR1502胶料的焦烧时间比SBR1500胶料有所缩短,硫化速度稍慢;SBR1507具有优异的加工性能;SBR1516胶料的硫化速度比SBR1502胶料稍慢,但加工性能较好,具有突出的抗湿滑性能;SBR1721胶料的硫化速度比SBR1712胶料慢,具有优异的抗湿滑性能;与非充油胶相比,充油胶具有加工性能好、生热低和耐磨性能好等特点,可降低生产成本. 相似文献
11.
12.
13.
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
14.
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. 相似文献
16.
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。 相似文献
17.
18.
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 相似文献
19.
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