研究了热硫化有机硅/三元乙丙橡胶(EPDM)微孔材料的过氧化物改性技术,并表征了改性泡沫的结构与性能。采用有机过氧化物/乙醇溶液,经过表面涂覆、渗透、高温反应,获得了改性的泡沫材料。结果表明:随着处理剂用量的增加,泡沫表面明显粗糙化,与乙二醇的接触角逐渐增大,泡沫的定伸应力逐渐增大,压缩永久变形和伸长率逐渐减小,而拉伸强度在逐渐增大后逐渐减小。随着EPDM含量的增加,泡沫的定伸应力逐渐上升、伸长率逐渐下降,拉伸强度则出现最大值、在处理剂大用量下波动较小。在改性处理后,有机硅/EPDM(70%)微孔泡沫的压缩应力在10%～40%出现明显抬升,泡沫压缩松弛和永久变形大幅减小,伸长率降低、扯断强度略有提高,泡沫具有良好的回弹性。
The peroxide modification technique for thermally vulcanized organosilicon/EPDM microcellular foam materials was investigated,and the structure and properties of the modified foams were characterized.The modified foam materials were obtained organic peroxide/ethanol solution through surface coating,penetrating and reaction process at high temperature.The results showed that with the increase of treatment agent dosage,the foam surface became significantly rougher,the contact angle with ethylene glycol gradually increased,the tensile stress of the foam gradually increased,the elongation at break and the compressive permanent set gradually decreased,and the tensile strength increased initially and then decreased.As the EPDM content increased,the tensile stress of the foam gradually increased,the elongation at break decreased,and the tensile strength reached a maximum value and showed low fluctuation at high peroxide dosage.After modification,the foam material (EPDM70%) showed that the compressive stress increased significantly in the range of 10%～40%,with low compressive permanent set and small stress relaxation.The elongation at break decreased,and tensile strength slightly improved,with a good elasticity.
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