CAJ | 학술논문

用硫化仪、高级扩展流变仪、气相色谱仪及平衡溶胀法，分别研究了硬脂酸用量对EPDM混炼胶硫化特性参数、硫化胶动态力学性能、DCP热解产物及硬脂酸含量和交联密度的影响，并探讨了硬脂酸对EPDM橡胶交联影响机理。研究结果表明，未添加金属氧化物时，硬脂酸降低DCP交联效率。随硬脂酸用量增加，正硫化时间t90无明显变化，交联密度呈线性降低，初始弹性模量降低，粘性模量和损耗因子提高，DCP热解产物α，α-二甲基苄醇和α-甲基苯乙酮含量无明显变化，而硬脂酸残留量和消耗量均升高；添加氧化锌或氧化镁后，硫化胶中硬脂酸消失，DCP交联效率提高。
용류화의、고급확전류변의、기상색보의급평형용창법，분별연구료경지산용량대EPDM혼련효류화특성삼수、류화효동태역학성능、DCP열해산물급경지산함량화교련밀도적영향，병탐토료경지산대EPDM상효교련영향궤리。연구결과표명，미첨가금속양화물시，경지산강저DCP교련효솔。수경지산용량증가，정류화시간t90무명현변화，교련밀도정선성강저，초시탄성모량강저，점성모량화손모인자제고，DCP열해산물α，α-이갑기변순화α-갑기분을동함량무명현변화，이경지산잔류량화소모량균승고；첨가양화자혹양화미후，류화효중경지산소실，DCP교련효솔제고。
The effects of stearic acid on curing characteristic parameters of EPDM blend,dynamic properties,the content of de-composition products of dicumyl peroxide(DCP) and stearic acid in EPDM vulcanizates,the crosslink density of EPDM vulcanizates were investigated respectively by vulcameter,senior extension rheometer,GC and balanced swelling method. The influence mecha-nism of stearic acid on crosslinking of EPDM rubber was studied. The results show that stearic acid reduces the crosslinking efficien-cy of DCP without adding metallic oxide. With the increasement of stearic acid,there is no obvious change of processing optimum curing time t90 ,the crosslink density linearly decreases,and the initial elastic modulus decreases,but the viscous modulus and loss factor increase. And there is no obvious change ofα-acetophenone,α,α-phenyl dimethyl carbinol which are the decomposition prod-ucts of DCP,both the residuces and consumption of stearic acid increase. With the adding of MgO or ZnO,stearic acid in EPDM vulcanizates disappear,and the crosslinking efficiency of DCP increases.