共查询到18条相似文献,搜索用时 125 毫秒
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研究新型抗硫化返原剂Z500对NR胶料的硫化特性、硫化胶的物理性能和压缩疲劳性能的影响。结果表明,加入抗硫化返原剂Z500,可以增大胶料的MH,降低胶料生热,改善胶料的抗硫化返原性能,提高硫化胶的主要物理性能、过硫化胶的耐热老化性能及压缩疲劳性能。 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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G. S. Shibulal JunYeol Jang Hee Chul Yu Yang Il Huh Changwoon Nah 《Journal of Polymer Research》2016,23(11):237
Vulcanization of natural rubber (NR) with conventional accelerated sulphur (CV) system leads to vulcanizate with polysulfidic linkages in the network. These polysulfidic linkages are less stable at elevated temperature due to reversion, which reduces the mechanical properties and increases the compression set. Moreover, the high temperature vulcanization of NR is limited due to reversion. To solve these problems, 4, 4′-bis (maleimido) diphenylmethane (BMDM) was used as an anti-reversion agent. The cure behaviour of NR-CV system with 5 phr of BMDM exhibited excellent reversion stability even at high temperature without adversely affecting the scorch safety as well as the rate of vulcanization. The crosslink densities of NR-CV were greatly increased with the content of BMDM. This enabled us to reduce the compression set values of NR-CV from 38 to 18 % at 70 °C and from 68 to 38 % at 100 °C with the use of 5 phr of BMDM. The glass transition temperature of the NR-CV system was slightly increased while the damping factor (tan δ) was decreased with the use of BMDM. 相似文献
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Koushik Pal Hirak Satpathi Tirthankar Bhandary Barun Kumar Samui Sanjay Bhattacharyya Kinsuk Naskar Rabindra Mukhopadhyay 《Polymer Engineering and Science》2021,61(10):2616-2629
Sulfidic linkages that are formed during the vulcanization process of natural rubber (NR) are unstable at a higher temperature and can be reversed into conjugated diene. To overcome such issue and to build a compound that is hostile to inversion and with increasing service life, anti-reversion agent (ARA), for example, N,N′-4,4′-diphenylmethyene bismaleimide (BMDM), is added into the formulation. This work explains the conjugation reaction mechanism of conjugated diene and BMDM by means of gas chromatography–mass spectrometry and Fourier transform infrared spectroscopy. The first phase of this study is associated with the change in ARA dosage keeping ZnO dosage the same. It is observed that 5 phr of BMDM and 2 phr ZnO combination (ARA4) shows lowest reversion at 160°C. The modulus value at 300% elongation increased 12% by the incorporation of BMDM as compared to the compound of no BMDM (ARA1). The second part is all about keeping BMDM dosage the same at 5 phr level and varying ZnO phr by 3, 4, and 5. From the overall results, it is observed that at a suitable dosage of BMDM and ZnO (5 phr BMDM and 3 phr ZnO combination [ARA5]), least reversion can be achieved and vulcanizates containing optimized BMDM and ZnO show better retention properties after aerobic aging as compared to ARA1. 相似文献
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采用季戊四醇锌与月桂酸锌并用作为硫化活性剂,考察其对天然橡胶硫化特性及物理机械性能的影响。结果表明,季戊四醇锌具有较高的硫化活性,可使胶料的硫化速率加快,硫化活化能下降,硫化活性高于月桂酸锌,但抗硫化返原性能较差,胶料的物理机械性能较低,耐磨性较差。将季戊四醇锌与月桂酸锌并用可产生硫化协同效应,明显提高胶料的表观交联密度,改善抗硫化返原性能,同时还能降低门尼黏度、提高填料分散性并降低生热和滚动阻力。加入6.70份季戊四醇锌并用5.56份月桂酸锌的天然橡胶硫化胶,其综合性能优于添加5.00份氧化锌的硫化胶,并且含锌质量分数减少48%。 相似文献
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研究抗硫化返原剂WY9188在不同硫化体系配方中的应用。结果表明:抗硫化返原剂WY9188在硫化过程中既能起到部分硫黄的作用,也能起到一定促进剂的作用;抗硫化返原剂WY9188用于不同的硫化体系配方,尤其是高硫低促配方体系中能够得到很好的抗硫化返原、焦烧安全和快速硫化的效果,但对部分物理性能有一定的负面影响,在对物理性能要求很高的产品中使用时需要适当调整配方以达到产品的使用要求。 相似文献
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