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研究了防老剂种类对EPDM/FKM共混胶耐老化性能的影响。研究表明,防老剂NBC和MB对硫化曲线基本无影响,影响最大的是胺类防老剂;老化前后,使用防老剂445的硫化胶拉伸强度及变化率、扯断伸长率及变化率均最好,使用防MB和NBC的效果其次,使用防老剂264的硫化胶性能变化率均最差,超过了空白实验的影响。 相似文献
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研究防老剂对过氧化物硫化体系氢化丁腈橡胶(HNBR)性能的影响。结果表明:防老剂种类可以显著影响过氧化物硫化体系HNBR硫化胶的交联密度,防老剂ZMTI可显著消耗过氧化物自由基,阻碍过氧化物硫化反应的进行,使采用防老剂ZMTI的硫化胶的交联密度减小,单用防老剂445或ODA对硫化胶的交联密度影响相对较小;单用防老剂445的HNBR硫化胶的定伸应力最大,弹性最好,压缩永久变形和损耗因子最小,防老剂445是非常适合过氧化物硫化体系HNBR的防老剂。 相似文献
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新型防老剂HS-911的应用试验 总被引:2,自引:1,他引:2
研究了防老剂HS-911的防老化性能和防变色能力以及与常用防老剂并用体系在轮胎胎面胶和胎侧胶、密封圈胶、彩色鞋底材中的应用。试验结果表明,防老剂HS—911具有较好的防老化性能和防变色能力,可替代防老剂264和2246用于浅色和彩色鞋材中,分别等量替代防老剂A,RD和SP—C,含防老剂HS—911的硫化胶比常用防老剂并用体系硫化胶具有较好的性能或性能相当。 相似文献
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试验研究防老剂DDA的抗硫化返原性能、耐热氧老化性能和耐臭氧老化性能,并与几种常用防老剂进行对比。结果表明,防老剂DDA具有优异的抗硫化返原性能和耐臭氧老化性能,并兼具防老剂4020的耐臭氧老化与防老剂RD的耐热氧老化的双重效果,其与防老剂4020并用后具有一定的协同效应。 相似文献
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研究了抗氧剂2-叔丁基-6-(3-特丁基-2-羟基-5-甲基苯基)-4-甲基苯酚丙烯酸酯(简称GM)、抗氧剂264和抗氧剂2246对NBR/WCB共混胶的硫化特性、力学性能和耐热老化性能的影响,并通过TG分析表征NBR/WCB共混胶的耐热稳定性。结果表明,与抗氧剂264和抗氧剂2246相比,抗氧剂GM对NBR/WCB共混胶具有防止焦烧、加快硫化速度和软化胶料的作用。添加抗氧剂GM的共混胶比加入抗氧剂264和2246的共混胶具有更优异的耐热老化性能。TG分析表明,在3种抗氧剂中,加入抗氧剂GM的NBR/WCB共混胶的耐热稳定性最高。 相似文献
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本文分别对MPU/NBR共混胶和MPU/EPDM共混胶进行了不同并用比的实验研究,分别将二者在硫化特性曲线、拉断强度变化、应力-应变关系、热氧老化性能变化以及动态生热性能变化规律进行对比,结果发现,MPU/EPDM共混胶的硫化匹配程度明显好于MPU/NBR共混胶.在MPU中加入NBR会使得MPU相的硫化受到抑制,硫化程... 相似文献
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研究了抗氧剂GM、抗氧剂264和抗氧剂2246对SBR/HAF混炼胶的硫化特性、力学性能和耐热老化性能的影响,并通过TG分析表征混炼胶的耐热稳定性.结果表明,与抗氧剂264和抗氧剂2246相比,添加抗氧剂GM的混炼胶具有更好的防焦烧性能,更高的力学性能以及更优异的耐热老化性能.TG分析表明,在三种抗氧剂中,加入抗氧剂G... 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
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The effect of concentration of antioxidants on the Mooney scorch time of two grades of epoxidized natural rubbers (ENR 25 and ENR 50) and one grade of natural rubber (SMR L) was studied using a Monsanto automatic Mooney viscometer (MV 2000). Three types of antioxidants, viz., 2,2′‐methylene‐bis(4‐methyl, 6‐tertbutylphenol) (AO 2246), N‐isopropyl‐N′‐phenyl‐p‐phenylenediamine (IPPD) and poly‐2,2,4‐trimethyl‐1,2‐dihydroquinoline (TMQ) were used, and the concentration range was varied from 0 to 5 phr. The conventional vulcanization system with 2‐mercaptobenzothiazole (MBT) as the accelerator was used throughout the study. Results show that increasing the phenol‐based antioxidant (AO 2246) concentration will increase the scorch time of ENR at a lower temperature of vulcanization while its effect on SMR L is not significant. This retardation effect is attributed to the “solvation” of epoxide group by the phenolic group in AO 2246, thus reducing the activation of adjacent double bond in ENR. The scorch time, however, is shortened by the amine‐based antioxidants (IPPD and TMQ) for the three rubbers studied, a phenomenon associated with the ability of the amine group to enhance the formation of more active sulfurating agent and subsequently increases the cure rate as the concentration of the amine‐based antioxidants is increased. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 74: 2940–2946, 1999 相似文献
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研究了氢氧化镁、氧化锌及硬脂酸对环氧化天然橡胶(ENR)硫化特性、硫化胶的力学性能及老化性能的影响。结果表明:加入2份氢氧化镁可有效地提高ENR的硫化速度、拉伸强度和抗热氧老化性能;氧化锌和硬脂酸对硫化胶网络的完善是不可缺少的。用差示扫描量热法(DSC)比较了几种防老剂(防老剂D,H.WSP,MB.4010,SP)在ENR中的防护效果。结果表明防老剂D的效果最好。以防老剂D与防老剂MB并用,加入2份氢氧化镁、2份硬脂酸和5份氧化锌,不仅可缩短硫化时间,而且可大幅度提高硫化胶的拉伸强度、扯断伸长率和老化系数。 相似文献
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研究了共混比为70/30的氯化聚乙烯(CM)/乙烯一醋酸乙烯酯橡胶(EVM)共混胶中不同MB的用量下,共混胶的硫化特性,热空气老化前后共混胶的力学性能、两相交联密度和动态力学性能。研究表明:随着MB用量的增加,共混胶的硫化特性稍有变化;老化前后,1#共混胶的力学性能及交联密度变化率较高,玻璃化转变温度的变化程度较大;老化前后,5#共混胶的力学性能变化率较低,交联密度变化率较低,玻璃化转变温度的变化程度较小。 相似文献