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首页> 外文期刊>Journal of Applied Polymer Science >Dependence of Mooney Scorch Time of SMR L,ENR 25 and ENR 50 on Concentration and Types of Antioxidants
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Dependence of Mooney Scorch Time of SMR L,ENR 25 and ENR 50 on Concentration and Types of Antioxidants

机译：SMR L，ENR 25和ENR 50的门尼焦烧时间与抗氧化剂浓度和类型的关系

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The effect of concentraition of antioxidants on the Mooney scorch time of two grades of epoxidized natural rubbers (EMR 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-phenyl-p-phenylenediamine (IPPD) and poly-2,2,4-tri-methyl-1,2-dihydroquinoline (TMQ) were used,and the concentration range was varied from O 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.
机译：使用孟山都自动门尼粘度计（MV 2000）研究了两种等级的环氧化天然橡胶（EMR 25和ENR 50）和一级天然橡胶（SMR L）的抗氧化剂浓度对门尼焦化时间的影响。三种类型抗氧化剂，即2,2'-亚甲基-双（4-甲基，6-叔丁基苯酚）（AO 2246），N-异丙基-N'-苯基-对-苯基-对苯二胺（IPPD）和聚-使用2,2,4-三甲基-1,2-二氢喹啉（TMQ），浓度范围为O至5 phr。整个过程中均使用以2-巯基苯并噻唑（MBT）为促进剂的常规硫化体系结果表明，在较低的硫化温度下，增加酚基抗氧化剂（AO 2246）的浓度会增加ENR的焦化时间，而对SMR L的影响不显着。这种阻滞作用归因于``溶剂化'' AO 2246中酚基对环氧基的影响，从而减少了ENR.T中相邻双键的活化但是，对于三种研究的橡胶，基于胺的抗氧化剂（IPPD和TMQ）缩短了焦化时间，这种现象与胺基团增强更多活性硫化剂形成并随后提高硫化速率的能力有关。随着胺类抗氧化剂浓度的增加。

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