密炼工艺对高用量纤维填充三元乙丙橡胶绝热层性能的影响

Effect of Internal Mixing Process on Properties of EPDM Insulation Layer Filled with Large Amount of Fiber

研究密炼工艺对高用量纤维填充三元乙丙橡胶(EPDM)绝热层性能的影响。结果表明,高用量纤维填充EPDM绝热层的最优密炼工艺为,在50 r·min^(-1)的转子转速下,投入EPDM塑炼2 min后加入纤维A混炼2 min,然后调整转子转速为30 r·min^(-1),加入纤维B、偶联剂A和1/3白炭黑混炼5 min,加入其他助剂混炼5 min。采用该密炼工艺的高用量纤维填充EPDM绝热层的物理性能和耐烧蚀性能最好,且最稳定。

The effect of internal mixing process on the properties of EPDM insulation layer filled with large amount of fiber was studied.The results showed that the optimal internal mixing process was as follows:adding EPDM to the internal mixer and carrying out the mastication for 2 minutes under the rotor speed of 50 r·min^(-1),and then adding fiber A,mixing for another 2 minutes;after that,adding fiber B,couple agent A and 1/3 silica,mixing for 5 minutes under the rotor speed of 30 r·min^(-1);in the final stage,adding the other additives in the formulation,mixing for 5 more minutes under the same rotor speed.The EPDM insulation layer filled with large amount of fiber processed with this optimal internal mixing process had the best and the most stable physical properties and ablation resistance.