湿法氧化锌种类和用量对天然橡胶性能的影响

研究湿法氧化锌种类和用量对天然橡胶(NR)性能的影响。结果表明:与添加普通氧化锌的胶料相比,对于未填充炭黑NR体系,减半用量的湿法氧化锌混炼胶的焦烧时间和t90较短,Fmax较大;硫化胶的定伸应力、拉伸强度和剪切模量(G′)较大,拉断伸长率、损耗模量(G″)和损耗因子(tanδ)较小。对于填充炭黑NR体系,减半用量的湿法氧化锌混炼胶的门尼粘度、G′和G″较大,tanδ较小,焦烧时间和t90较短,Fmax较大;硫化胶的密度稍低,硬度和定伸应力较大,耐老化性能较好,玻璃化温度较低,tanδ较小,其他物理性能变化不大。湿法氧化锌FF的性能优于湿法氧化锌HR。

Effect of Type and Amount of Wet Process Zinc Oxide on Properties of Natural Rubber

The effect of the type and amount of wet process zinc oxide(ZnO)on the properties of natural rubber(NR)was investigated.The results showed that,for the NR compound without carbon black,when the ordinary ZnO was replaced by half amount of wet process ZnO,the scorch time and t90 were shortened,Fmax increased,the modulus,tensile strength and shear modulus(G′)of the vulcanizate were larger,the elongation at break,loss modulus(G″)and loss factor(tanδ)were reduced.For the NR system filled with carbon black,when the ordinary ZnO was replaced by half amount of wet process ZnO,the Mooney viscosity,G′and G″of the mix increased,tanδof the compound decreased,scorch time and t90 were shortened,Fmax increased,density was slightly lower,the hardness and modulus of the vulcanizate increased,aging resistance was improved,glass transition temperature and tanδof the vulcanizate were reduced,and other physical properties had little changed.It was also found that the property of wet process ZnO FF was better than that of wet process ZnO HR.