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综述了纳米氧化锌制备、改性方法对NR性能的影响,以及纳米氧化锌复合材料的应用研究情况。纳米氧化锌粒径小,比表面积大,具有表面效应和高活性。改性的纳米氧化锌可以在天然橡胶中实现良好分散,可达到提高胶料性能目的,同时降低了ZnO的用量。应用于汽车轮胎、减震器、橡胶止水带,效果显著,符合当今环保发展的趋势。 相似文献
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纳米氧化锌对天然橡胶疲劳性能的影响 总被引:3,自引:0,他引:3
研究了纳米氧化锌对天然橡胶(NR)硫化胶疲劳性能的影响。结果表明,纳米氧化锌对NR胶料的硫化起步延迟作用较大,但却能改善NR的热老化性能,当其用量为5份时综合性能最佳。与普通氧化锌相比,纳米氧化锌会使NR的疲劳寿命下降,其原因主要是纳米氧化锌聚集在橡胶中易于形成微观空穴,疲劳应力作用下逐渐导致宏观上的材料破坏;而普通氧化锌的大粒径颗粒较多,不易发生聚集现象,这也导致了添加纳米氧化锌的NR疲劳断裂后其断裂面较平滑,而添加普通氧化锌的断裂面较粗糙。 相似文献
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研究硫化温度、时间和压力对天然橡胶(NR)发泡材料静刚度(Ks)和动静刚度比(Kd/Ks)的影响。结果表明:在一段硫化中,NR发泡材料的Ks随着硫化温度的升高、时间的延长和压力的增大而增大,Kd/Ks随着温度的升高而增大,随着时间的延长而减小,几乎不随压力变化。在二段硫化中,NR发泡材料的Ks和Kd/Ks随着硫化温度的升高和时间的延长而减小,随着压力的增大而先增大后减小。当一段硫化条件为115 ℃/10 MPa×15 min、二段硫化条件为150 ℃/10 MPa×10 min时,NR发泡材料能满足减震垫板成型的指标要求。 相似文献
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研究硫化温度、时间和压力对天然橡胶(NR)发泡材料静刚度(Ks)和动静刚度比(Kd/Ks)的影响。结果表明:在一段硫化中,NR发泡材料的Ks随着硫化温度的升高、时间的延长和压力的增大而增大,Kd/Ks随着温度的升高而增大,随着时间的延长而减小,几乎不随压力变化。在二段硫化中,NR发泡材料的Ks和Kd/Ks随着硫化温度的升高和时间的延长而减小,随着压力的增大而先增大后减小。当一段硫化条件为115℃/10MPa×15min、二段硫化条件为150℃/10MPa×10min时,NR发泡材料能满足减震垫板成型的指标要求。 相似文献
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用天然橡胶制备彩色发泡胶球,研究了发泡剂及发泡助剂、硫化体系、填充体系、混炼和硫化工艺以及发泡工艺等对发泡胶球品质的影响。结果表明,发泡剂选用二亚硝基五亚甲基四胺与小苏打和尿素脂BK并用体系可使胶球的泡孔细密均匀,气味很小;硫化体系采用临界温度较低的促进剂TT、CZ及M与硫黄并用能使硫化程度与发泡速率很好地匹配;选择轻质碳酸钙和滑石粉作为填充体系、使用门尼黏度为20~40的胶料及采用二段硫化工艺时所制备发泡胶球的泡孔细密、结构理想,发泡倍率与国外胶乳发泡制品相当。 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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研究纳米氧化锌等量或减量替代间接法氧化锌对NR胶料性能的影响。结果表明 ,当纳米氧化锌等量或减量 3 0 %替代间接法氧化锌应用时 ,胶料的焦烧时间和正硫化时间延长 ,抗硫化返原性能提高 ,硫化胶的邵尔A型硬度、3 0 0 %定伸应力和拉伸强度增大 ;当纳米氧化锌减量 60 %~ 80 %使用时 ,胶料的抗硫化返原性能下降 ,硫化胶的拉断伸长率和撕裂强度增大 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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试验考察用纳米氧化锌等量或减量替代普通氧化锌在轮胎胎面胶中的应用效果。试验结果表明,纳米氧化锌可延长胶料的焦烧时间,提高硫化胶的拉伸性能和耐磨性能,硫化胶的耐老化性能也较好;减量替代比等量替代的效果更佳。轮胎成品试验表明胎面胶的耐磨性能改善。 相似文献
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以均匀沉淀法作为纳米氧化锌铝掺杂的制备方法。通过正交试验,考察了铝离子掺杂量、煅烧温度等反应参数对纳米氧化锌粉体粒径的影响。结果表明:水解温度的影响最大,其次是煅烧时间,尿素配比和煅烧温度影响较小;最佳工艺为以OP-10做表面活性剂,锌离子浓度0.3 mol/L,水解时间4h,尿素与锌离子摩尔比为3,水解温度95℃,煅烧温度450℃,煅烧时间2 h,铝离子的最佳掺杂量(以锌离子的摩尔数为基准)5%。对铝掺杂纳米氧化锌进行了XRD、SEM粒径分析,结果表明掺杂效果良好,得到的铝掺杂纳米氧化锌粒径最小可达到20 nm。 相似文献
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试验研究纳米氧化锌减量替代间接法氧化锌在载重轮胎胎面胶中的应用。结果表明,与间接法氧化锌相比,比表面积为60 m2.g-1的纳米氧化锌胶料的MH增大,ts2,t10和t90延长,硫化胶的拉伸强度和耐磨性提高;以纳米氧化锌减量50%替代间接法氧化锌用于胎面胶中,硫化胶的物理性能总体提高,成品轮胎的速度性能、耐久性能和耐磨性能有所提高。 相似文献
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The cure index and apparent activation energy of vulcanization of one grade of natural rubber (SMR L) and two grades of epoxidized natural rubbers (ENR 25 and ENR 50) were studied in the presence of three types of antioxidants [viz., 2,2′methylene‐bis(4‐methyl‐6‐tertbutylphenol) (AO 2246), poly‐2,2,4‐trimethyl‐1,2‐dihydroquinoline (TMQ), and N‐isopropyl‐N′‐phenyl‐p‐phenylenediamine (IPPD)] in the temperature range of 120–180°C by using a Monsanto automatic Mooney viscometer. Accelerated sulfur vulcanization system and up to 5 phr of antioxidant concentration was used throughout the investigation. Results indicate that both cure index and apparent activation energy of vulcanization are dependent on the type and concentration of the antioxidant used. AO 2246 (a phenol‐based antioxidant) would retard vulcanization as reflected by the higher cure index and activation energy, an observation which is attributed to the solvation and steric hindrance effects of the antioxidant. On the contrary, both TMQ and IPPD (amine‐based antioxidants) exhibit reverse behavior due to the catalytic effect of the antioxidants in generating more active sulfurating agents for vulcanization. In all cases, SMR L gives higher cure index and apparent activation energy than the corresponding ENR, a phenomenon which is associated with the activation of the adjacent double bond by epoxide group in the latter. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 77: 3234–3238, 2000 相似文献