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进行了国产硫化活化剂Z-311在胎面胶中的应用试验。结果表明,加入2份硫化活化剂Z-311的胎面胶胶料,压缩疲劳温升明显下降,300%定伸应力和硬度增大,耐磨性提高,耐热老化性能变化,在高温硫化条件下仍保持较好的物理性能。 相似文献
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用硫化返原率曲线表征胶料的抗硫化返原性能 总被引:5,自引:4,他引:5
提出用硫化返原率曲线表征胶料的抗硫化返原性能的观点。硫化返原率曲线可以清晰地反映胶料的硫化返原过程和准确表征其抗硫化返原性能,可以作为抗硫化返原剂或胶料的特征曲线;不同抗硫化返原剂的作用机理决定了它们的抗硫化返原效果及其应用场合。 相似文献
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将自制的4,4′-N,N′-二苯甲烷双柠康酰亚胺(BCI)用作抗硫化返原剂,研究其对NR胶料性能的影响,并与抗硫化返原剂PK900进行对比。结果表明,BCI具有与PK900相近的抗硫化返原性能,与未加抗硫化返原剂的胶料相比,加入BCI的胶料ML和MH减小,t10和t90变化不大;硫化胶的定伸应力和拉伸强度增大,拉断伸长率减小。裂解气相色谱分析表明,BCI在NR硫化返原过程中形成了新的C—C交联键。 相似文献
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研究了锌皂类耐热硫化活性剂SL-273在天然橡胶中的应用效果。结果表明:在配方中使用SL-273,胶料的抗硫化返原性良好,并能有效提高抗热氧老化性能。 相似文献
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Zinc oxide (ZnO) nanoparticles of size 20–90 nm and surface area 9.56 m2/g were synthesized from ZnCl2 and Chitosan and characterized by X‐ray diffraction, high resolution transmission electron microscopy (HRTEM), and scanning electron microscopy (SEM). Natural rubber (NR) vulcanizates containing nano ZnO was prepared by mill mixing and characterized by SEM, energy dispersive X‐ray analysis (EDAX), and HRTEM. Cure characteristics, free volume studies, bound rubber, crosslink density, and dynamic mechanical properties were evaluated and compared with that of NR vulcanizate containing conventional micro ZnO. Considering the cure characteristics, it was found that NR vulcanizate with 0.5 phr (parts per 100 g rubber) of nano ZnO showed low values of optimum cure time (t90) and very high cure rate index compared with 5 phr of conventional micro ZnO. The study shows that micro ZnO can be successfully replaced with nano ZnO for accelerated sulfur vulcanization process in NR, and preparation of vulcanizate containing nano ZnO with better properties as that of micro ZnO. The optimum dosage of nano ZnO as a cure activator in NR vulcanization was found to be 0.5 phr compared with conventional grade micro ZnO. This will lead to substantial cost reduction in the manufacture of rubber products and alleviate environmental pollution due to excess ZnO in rubber compounds. POLYM. ENG. SCI., 2013 © 2013 Society of Plastics Engineers 相似文献
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Z-18抗焦活化剂在重油催化裂化装置上的应用 总被引:1,自引:0,他引:1
介绍了Z-18抗焦活化剂在中国石油大连石化公司重油催化裂化装置中的应用,分析了Z-18抗焦活化剂的作用机理,考察了抗焦活化剂的加注对于装置产品液收率和焦炭产率的影响.结果表明,Z-18抗焦活化剂能有效地维持催化剂的活性,明显减少焦炭生成,改善产品分布. 相似文献
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Hassarutai Yangthong Skulrat Pichaiyut Suwaluk Wisunthorn Claudia Kummerlöwe Norbert Vennemann Charoen Nakason 《应用聚合物科学杂志》2020,137(17):48624
Geopolymer (GP) was synthesized and used as activators in sulfur vulcanization of epoxidized natural rubber (ENR). Influences of GP on cure characteristics, crosslink density, mechanical, thermal, and morphological properties were investigated and compared to the conventional rubber formulation with ZnO activator. The ZnO is a hazardous chemical for the environment and has proclaimed that its application in rubber technology should be reduced and controlled. It was found that the GP-activated ENR compounds showed significantly higher vulcanization rate than cases with the conventional ZnO compound. This was indicated by the GP activated compounds having shorter scorch time, cure times, and lower activation energy but higher cure rate index (CRI). Also, the GP activated ENR compounded with stearic acid exhibited the highest conversion. This matches well the highest torque difference and crosslink density, observed by temperature scanning stress relaxation (TSSR) and swelling measurements. Furthermore, the GP-activated vulcanizate had better thermal stability than the ZnO-activated ENR material. In addition, the GP-activated ENR vulcanizate with stearic acid exhibited high 100% moduli, tensile strength, and hardness. This proves that GP has a high potential for use as activators in sulfur vulcanization of rubber compounds, as an alternative to the conventional ZnO. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137, 48624. 相似文献
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Suchismita Sahoo Madhuchhanda Maiti Anirban Ganguly Jinu Jacob George Anil K. Bhowmick 《应用聚合物科学杂志》2007,105(4):2407-2415
Zinc oxide (ZnO) nanoparticles were synthesized by homogeneous precipitation and calcination method and were then characterized by transmission electron microscopy and X‐ray diffraction analysis. Synthesized ZnO was found to have no impurity and had a dimension ranging from 30–70 nm with an average of 50 nm. The effect of these ZnO nanoparticles as cure activator was studied for the first time in natural rubber (NR) and nitrile rubber (NBR) and compared with conventional rubber grade ZnO with special reference to mechanical and dynamic mechanical properties. From the rheograph, the maximum torque value was found to increase for both NR and NBR compounds containing ZnO nanoparticles. ZnO nanoparticles were found to be more uniformly dispersed in the rubber matrix in comparison with the conventional rubber grade ZnO as evident from scanning electron microscopy/X‐ray dot mapping analysis. The tensile strength was observed to improve by 80% for NR when ZnO nanoparticles were used as cure activator instead of conventional rubber grade ZnO. An improvement of 70% was observed in the case of NBR. The glass transition temperature (Tg) showed a positive shift by 6°C for both NR and NBR nanocomposites, which indicated an increase in crosslinking density. The swelling ratio was found to decrease in the case of both NR and NBR, and volume fraction of rubber in swollen gel was observed to increase, which supported the improvement in mechanical and dynamic mechanical properties. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007 相似文献
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根据无机配合剂在橡胶中的分散形态,研究纳米氧化锌在橡胶中的作用机理及其对胶料性能的影响。在硫化过程中氧化锌作为活性剂与有机促进剂、硬脂酸、硫黄等的反应发生在氧化锌粒子的表面。以纳米氧化锌等量替代普通问接法氧化锌,可提高硫化胶的300%定伸应力和耐磨性,减小压缩永久变形,降低压缩疲劳温升;以纳米氧化锌减量50%替代间接法氧化锌,仍可保证硫化胶的性能要求。 相似文献
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Saeed Taghvaei‐Ganjali Mercedeh Malekzadeh Mona Farahani Ali Abbasian Morteza khosravi 《应用聚合物科学杂志》2011,122(1):249-256
Zinc oxide (ZnO) and nano‐zinc oxide (nZnO) were surface modified by polyethylene glycol (PEG) and poly propylene glycol (PPG). Modification of particles were controlled by transmission electron microscopy, Brunauer, Emmett, Teller specific surface area measurement, infrared (IR) spectroscopy, and differential scanning calorimetry. IR spectra were shown that the interactions between surface modifiers and particles are hydrogen bonding. Modified particles were applied as an activator in vulcanization of natural rubber/styrene butadiene rubber (NR/SBR) blend. Dispersion of modified particles in rubber matrix was investigated by scanning electron microscopy and shown good results. Blend properties were improved by using modified particles. These improvements were due to the better hydrophobicity of modified particles, which were more compatible with nonpolar rubber matrix and caused better participation in curing process. Modification by PEG and PPG were shown better compound properties for ZnO and nZnO, respectively. Application of ZnO‐modified particles were presented better compound properties in comparison with nZnO‐modified particles. It has confirmed more effective mixing of ZnO‐modified particles in rubber matrix by using ordinary mixers. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011 相似文献
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