共查询到20条相似文献,搜索用时 250 毫秒
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研究了5种二辛基二硫代磷酸稀土配合物(REDODP)对天然橡胶(NR)硫化特性、力学性能和老化性能的影响,并与二辛基二硫代磷酸钾(KDODP)和二辛基二硫代磷酸锌(ZnDODP)进行了对比。结果表明,含REDODP的NR胶料的正硫化时间介于含ZnDODP和KDODP的胶料之间,但抗返原性比KDODP的好,而与ZnDODP的相近。由于REDODP促进剂中RE是三配位,胶料中RE含量较低,降低了硫化胶的交联密度,对力学性能有一定的影响,但硫化胶老化前后拉伸强度及拉断伸长率下降幅度低于含KDODP和ZnDODP的硫化胶,表明REDODP有利于提高NR硫化胶的耐老化性能。 相似文献
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LaDBDP稀土配合物用量对天然橡胶性能的影响 总被引:1,自引:0,他引:1
将O,O'-二丁基二硫代磷酸镧(LaDBDP)用作天然橡胶(NR)的硫化促进剂.研究了LaDBDP用量对NR硫化特性、力学性能和热空气老化性能的影响,并与相应的非稀土配合物NaDBDP和ZnDBDP做了对比.结果表明,LaDBDP,NaDBDP和ZnDBDP用量对NR各项性能的影响规律基本相同.随着LaDBDP用量由1mmol增至4mmol,NR硫化速度显著加快,硫化胶力学性能提高,但对NR热空气老化性能的影响不明显.当LaDBDP用量由4mmol增至6mmol时,对NR硫化特性和力学性能的影响不明显,但热老化性能有所下降.当LaDBDP用量为4mmol时,NR综合性能最佳. 相似文献
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含硫,磷和氮的有机促进剂对生胶硫化过程和硫化橡胶性能的影响 总被引:1,自引:0,他引:1
综述了磷酸化的二硫化氨基甲酸盐、二硫代磷酸及二硫代膦酸衍生物、磷酸化硫代酰胺及磷酸化二苯胍等作二烯类橡胶的硫化促进剂的作用及对胶料和硫化胶性能的影响。使用上述含硫、磷和氮的促进剂胶料有良好的抗焦烧性能,可提高硫化速率,且赋予硫化胶良好的综合性能 相似文献
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再生沥青有一般道路沥青所不具备的特殊性,对再生后沥青抗老化性能的考察却并无统一认可的方法。本文采用老化指数法和软化点速率升高常数法,分别考察了沈阳-铁岭(沈铁)和沈阳-本溪(沈本)公路段再生沥青及其原沥青辽河AH-90的抗老化性能。实验结果证明了这两种方法的可靠性。 相似文献
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耐高温三元乙丙橡胶制备研究 总被引:1,自引:0,他引:1
通过选择合适的耐热防老剂和以白炭黑和氧化镁作填充剂,并用EVM等,通过合理的配合,制备了耐高温三元乙丙橡胶(EPDM)。结果表明,以防老剂NBC 2.5份,氧化镁20份,EVM 10份制备出的EPDM胶料,其硫化胶经175℃,24 h热空气老化后的扯断伸长保持率80%以上,且综合性能良好。 相似文献
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Various coated metal samples with different pretreatments were investigated by electrochemical impedance spectroscopy (EIS). Variables were the substrate (cold-rolled steel and hot-dipped galvanized steel), phosphate system (iron and zinc phosphate), post rinse (chromate and silane/zirconium rinse) and paint systems. The corrosion performance was determined on the basis of coating degradation, water uptake and interface delamination of the tested samples. The zinc phosphate performed better than iron phosphate on CRS. The silane/Zr rinse did not perform well in the CRS/iron-phosphate system. However, it showed a better performance than the chromate when used as a post rinse of zinc phosphate. Salt spray test (SST) and adhesion test results of the same samples are also reported in this paper and compared to the EIS data. The correlation among three test methods was poor. 相似文献
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用氢氧化镁、氧化锌、异辛酸为原料制备了异辛酸镁、异辛酸锌,将其作为一种新型液体聚氯乙烯(PVC)热稳定剂用于本试验中。采用热老化烘箱法、刚果红法和电导率法研究了异辛酸镁/锌在PVC制品中的静态热稳定性能,并探究了异辛酸镁和异辛酸锌之间的协同效应。采用热重分析技术分别考察了PVC试片在180℃条件下恒温60min的热损失变化情况及25℃~600℃范围内,以10℃/min等速升温过程中的热损失变化情况。结果表明:当镁与锌的金属含量分别为2%和2.5%时,PVC的热稳定时间可达50min,远远超出市售钙/锌的30min,其静态热稳定效果最优。通过动态双辊塑炼和力学性能试验,表明异辛酸镁/锌对PVC制品具有优良的动态热稳定性能和突出的力学性能。 相似文献
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Various zinc oxide nanostructures were synthesized using thermal decomposition of zinc acetate dihydrate in a single process. The characterization of samples using powder X-ray diffraction, scanning electron microscope and FT-IR measurements revealed that the pure phase of different morphologies such as nanoparticles, nanowires and nanodisks had been synthesized successfully. Surprisingly some synthesized ZnO nanostructures were dark gray. The results showed that the reason may have been related to the oxygen deficiency and strong asymmetric stretching mode of wurtzite ZnO nanostructure. Using such samples, the photodegradation of Methylene blue was performed by UV–vis absorption measurement and the effect of morphology on the photocatalytic properties of different ZnO nanostructures was examined. The results showed that the nanodisks had the best photocatalytic performance among the other morphologies. The reason was attributed to the presence of specific crystal planes such as (0001) facets in nanodisks which can improve their photocatalytic performance. 相似文献