防老剂d与bht标准物质的研制及橡胶热氧老化研究

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1、流动相为甲醇:去离子水(PH=5)=92.5:7.5(体积比)，流速采用0.5mL/min。高效液相色谱法测试发现碱洗后的防老剂D重结晶纯度明显提高，经过多次区域熔融的效果最佳;防老剂D工业品中几乎不含苯胺，具体原因可能是苯胺已被氧化:防老剂BHT所含的杂质主要是对甲酚和异丁醇，其中异丁醇的含量大。使用高效液相色谱法测量时，选择用标准曲线法和单点校正法定量测量防老剂D与BHT纯度，并检验防老剂D与BHT的均匀性和稳定性，得出均匀性和稳定,性符合要求。天然橡胶的热氧老化研究结果表明，防老剂D纯度越高，天然橡胶的抗热氧老化能力越强。关键词:标准物质防老剂D防老剂BHT重结晶区域熔

2、融高效液相色谱定性分析定量分析差示扫描量热法均匀性稳定性橡胶热氧老化ABSTRACTN-phenyl-fl-naphthylamine(antioxidantD)and2,6-Di-tert-butyl-P-cresol(anti-oxidantBHT)arethetwokindsofantioxidantwhichareextensivelyusedinourcountry.Theirstandardreferencematerialscanbeusedtorectifyinstrumentsandmeasureouranalyticalmethods.Thispaperi

3、smainlyconcernedabouthowtopurifytheindustrialproductsoftheantioxidantDandBHT,howtodeterminetheirpurities,determiningtheirpuritiesandthepuritiesneedtobemorethan99%.Inordertoattainthiso句ective,recrystalizingmethodisusedtopurifyantioxidantDandantioxidantBHTmethodsofhighPperfoormmanncelliiqquid

4、chromatography(HPLC)isusedtodeterminethechemicalcompositionoftheantioxidantDandBHT,itisqualitativeanalysis.Atthesametimeanapparatusofzonemeltingisdesigned,themethodofzonemeltingisusedtopurifythepurifiedproductofrecrystalizing.Afterpurification,thehomogeneityandstabilityofthepurifiedproducto

5、fantioxidantDandBHTareexaminedbyhighperformanceliquidchromatography(HPLC).Themethodsofhighperformanceliquidchromatography(HPLC)anddifferentialscanningcalorimetry(DSC)areusedtodeterminetheirpurities,itisquantitativeanalysis.Besidesthat,italsostudiestheeffectsofindustrialandpurifiedantioxidan

6、tDinnaturalrubber.Theproperconditionsofpurificationanddeterminationaresettleddownthroughexperimentsandanalysis.Anumberofadditionalanalysesarealsoperformedtocharacterizethematerial.TheyarehomogeneousandstableforatleastIyear.Inadditiontothistheperformanceofresistancetohot-oxygenageingofNRisob

7、viouslyimprovedwiththeantioxidantDpurityincreasing.KEYWORDS:1.StandardReferenceMaterials(SRMs)2.AntioxidantD3.AntioxidantBHT4.Recrystalize5.Zonemelting6.HPLC7.Qualitativeanalysis8.Quantitativeanalysis9.DSClO.Homogeneous11.Stability12.Hot-oxygenAgeing西北工业