共查询到18条相似文献,搜索用时 140 毫秒
1.
2.
影响CR/CIIR硫化胶耐热老化性能的因素 总被引:2,自引:0,他引:2
研究了共混比、硫化体系、炭黑品种及用量、软化剂种类等对CR/CIIR硫化胶耐热老化性能的影响。结果表明,100℃×48h热老化后,CR/CIIR硫化胶的力学性能保持率随CIIR用量的增加而提高;采用TCY/树脂复合硫化体系硫化的CR/CIIR力学性能保持率相对较高;采用N550炭黑补强的硫化胶耐热老化性能良好,但用量不宜超过60份;软化剂对硫化胶的耐热老化性能也有一定影响。 相似文献
3.
研究了炭黑品种和用量对丙烯酸酯橡胶/氟橡胶(ACM/FKM)共混物硫化特性、硫化橡胶力学性能及耐热老化性能的影响。结果表明:当丙烯酸酯橡胶和氟橡胶共混比为30/70时,加入炭黑后共混物焦烧时间t10和正硫化时间t90都减小,硫化橡胶力学性能有不同程度提高。随N660用量的增加.硫化橡胶力学性能先上升后下降。当炭黑用量为20份时,效果最好。 相似文献
4.
研究了氯磺化聚乙烯(CSM)和丁腈橡胶(NBR)的共混比、硫黄用量、炭黑、防老剂及软化剂诸因素对CSM/NBR共混物耐热老化性能的影响。结果表明,将CSM与NBR共混,可以改善NBR的耐热老化性能,当CSM/NBR共混比(质量比)为50/50时,耐热老化性能得到显著提高。适当减少硫黄用量,有利于保持较高的耐热老化性能,硫黄用量以0.25~0.75份为宜。炭黑用量对共混物的耐热老化性能有影响,随着炭黑N 550用量的增加,老化后的力学性能保持率先增加后减小。防老剂NBC的耐热老化效果较好。软化剂选用邻苯二甲酸二丁酯或邻苯二甲酸二辛酯时,CSM/NBR共混物具有较好的耐热老化性能。 相似文献
5.
采用机械共混方法制备了均聚型/共聚型氯醚橡胶(CO/ECO)共混物,考察了配方因素对共混物耐热老化性能的影响。结果表明,CO和ECO二者的共混比对共混物耐热老化性能影响不大。增强剂的种类对耐热老化性能影响较为显著,以填充沉淀法白炭黑和气相法白炭黑共混物的耐热老化性能较好;以炭黑为增强剂时,其用量以40~50份为佳。以三聚硫氰酸为硫化体系硫化的共混物,其热稳定性优于以1,2-亚乙基硫脲为硫化体系硫化的共混物。添加各种软化剂,均会导致共混物耐热老化性能下降;而各种防老剂中,以防老剂NBC、4010 NA和RD对共混物的防老化效果为最好。 相似文献
6.
7.
TCY/TMTD硫化体系对CO/ECO共混物性能的影响 总被引:1,自引:1,他引:0
研究了三聚硫氰酸(TCY)/二硫化四甲基秋兰姆(TMTD)复合硫化体系对CO/ECO共混物的力学性能、耐热老化性能和高温压缩永久变形性能的影响。结果表明:适当的TCY用量可以获得较好力学性能的CO/ECO共混胶。增加TCY用量可以显著提高共混胶的耐热老化性能和高温压缩永久变形性能;而增加TMTD用量会导致CO/ECO共混胶耐热老化性能和高温压缩永久变形性能下降;二段硫化可以降低共混胶的压缩永久变形。 相似文献
8.
将炭黑(CB)、氢氧化单甲基丙烯酸锌(HZMMA)和碳纳米管(CNTs)进行复配,以改性氢化丁腈橡胶(HNBR)/氟橡胶(FKM)共混胶,制备了HNBR/FKM复合材料,研究了复合型增强剂对HNBR/FKM共混胶硫化特性、硫化胶的物理机械性能、动态力学性能和耐热氧老化性能的影响。结果表明,当加入HZMMA和CNTs后,HNBR/FKM复合材料的硫化速率加快且交联程度提高;在HZMMA和CNTs的协同作用下,HNBR/FKM复合材料的物理机械性能明显提高;与纯CB增强的相比,加入3份(质量)CNTs的HZMMA增强的HNBR/FKM复合材料热氧老化后扯断伸长率的保持率最高,与此同时硬度变化率最低;随着CNTs添加量的增加,HNBR/FKM复合材料的玻璃化转变温度向低温方向移动,同时损耗因子呈逐渐下降的趋势。 相似文献
9.
研究了在丁腈橡胶(NBR)与丙烯酸酯橡胶(ACM)共混胶中NBR预硫化时间对共混胶性能的影响。结果表明在此硫化体系下ACM硫化速度远快于NBR,NBR预硫化工艺能有效提高其硫化程度以及与ACM相的硫化同步性,但预硫化时间过长会导致其门尼黏度增大,不利于两相共混。随着NBR预硫化时间的增加,ZnO在预硫化过程中的消耗量逐渐增加,减小了对共混胶中ACM硫化抑制作用,NBR/ACM共混胶物理机械性能先增大后减小,耐热空气老化性能先增强后降低,耐热油老化性能逐渐提升、随着NBR预硫化时间的增加,NBR相交联密度几乎不变,而ACM相的交联密度随预硫化时间的增加而逐渐变大。 相似文献
10.
11.
12.
13.
14.
The cure characteristics and mechanical properties of gum and filled acrylic rubber (ACM), fluorocarbon rubber (FKM), and their blends of varying compositions were studied both under unaged and aged conditions. The rheometric study showed that optimum cure properties were obtained using a mixed curing system of blocked diamine, hexamethylenediamine carbamate (Diak #1), and ammonium benzoate. From varying the curing agents, the optimum levels of Diak #1 and ammonium benzoate were found to be 1.5 and 2.5 phr, respectively. The addition of different fillers and their loading influenced the cure properties, with increased torque and reduced scorch safety. The gum and filled 50:50 (w/w) ACM‐FKM showed overall performance in strength properties. Postcuring improved the strength of all the systems, especially the systems with a higher proportion of FKM. None of the properties changed significantly during aging of the blends. FKM and the blends containing a higher proportion of FKM were affected least by aging. Swelling of the blends was reduced by the addition of fillers. Dynamic mechanical thermal analysis showed a single tan δ peak corresponding to a single phase transition for both cured and filled blends. The storage modulus of the blend increased from the gum blend to the filled blend, indicating the presence of polymer‐filler interaction. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 1442–1452, 2003 相似文献
15.
Dynamic mechanical analysis was performed to characterize the viscoelastic properties of binary and ternary blends of fluorocarbon elastomer (FKM), acrylic elastomer (ACM) and liquid crystalline polymer (LCP). The results showed that the storage and loss modulus of all the blends increased significantly with the weight percentage of the LCP. The glass transition temperature evaluated at the loss modulus peak, were in the range of −10-+5 °C for all the blends. The time temperature superposition principle was applied for the FKM/ACM and 20% LCP filled FKM/ACM blend in order to evaluate the changes in the viscoelastic properties of FKM/ACM blend by the addition of LCP. The Arrhenius and William-Landel-Ferry (WLF) equations were used to quantify the viscoelastic behaviour at the glass transition region. Both the blends exhibited a single relaxation, which is glass transition, observed as a peek in the loss modulus at 1 Hz. The glassy moduli of these two systems were found to be comparable, but the rubbery moduli of the LCP filled FKM/ACM was much higher than the LCP unfilled system. However, the viscoelastic behaviour of these two systems and their sensitivity to time temperature may be considered to be quite similar. 相似文献
16.
顺丁橡胶对硅橡胶/丙烯酸酯橡胶并用胶的增容作用 总被引:1,自引:0,他引:1
采用偏光显微镜、差示扫描量热仪以及力学性能、热老化性能测试手段,研究了顺丁橡胶(BR)增容的甲基乙烯基硅橡胶(MVQ)/丙烯酸酯橡胶(ACM)共混体系的并用比(质量比)、硫化工艺参数以及BR的加入对并用胶力学性能、耐热老化性能和相容性的影响。结果表明,BR的加入改善了MVQ/ACM并用胶的力学性能和耐热老化性能,当白炭黑用量为30份、BR/MVQ/ACM的并用比为25/45/55时,并用胶的力学性能和耐热老化性能最好;最佳硫化工艺参数为70℃×10 MPa×30 min;加入BR可以改善MVQ/ACM并用胶的相容性,且使其玻璃化转变温度降低,耐低温性能提高。 相似文献
17.
The mechanical, morphological and thermal properties of the binary and ternary blends of a fluorocarbon elastomer (FKM), an acrylic elastomer (ACM) and a liquid crystalline polymer (LCP) were investigated. The ternary blends were prepared by varying the amount of the LCP but fixing the ratio of the FKM and ACM. Addition of a third component, a polyacrylic rubber which interacted with the LCP, facilitated the structural development of the LCP phase by acting at the interface. The mechanical properties of the ternary blends were substantially improved because of both the fibril generation and adhesion of rubber particles on the LCP fibrils, which were attributed to the ACM interaction. Morphological investigations suggest that the fine fibrillation of the LCP domains is more apparent in the ternary blends than in the binary blends of FKM and LCP prepared under the same processing conditions. Thermogravimetric analysis (TGA) revealed an improved thermal stability of the FKM in the presence of the LCP for the binary blends, but a lower thermal stability for the ternary blends. Copyright © 2005 Society of Chemical Industry 相似文献