A premolded EPDM pipe flashing composition comprises 100 parts by weight of an elastomeric polymer comprising from about 70 to 95 parts by weight of at least one amorphous ethylene-propylene-diene terpolymer and from 5 to about 30 parts by weight of at least one crystalline or semi-crystalline ethylene-propylene-diene terpolymer; from about 35 to 175 parts by weight of a filler selected from the group consisting of reinforcing and non-reinforcing materials and mixtures thereof, per 100 parts of the polymer; from about 30 to 110 parts by weight of a processing material and mixtures thereof, per 100 parts of the polymer; and from about 0.6 to 7.5 parts by weight of a cure package, per 100 parts of the polymer, the cure package comprising from about 0.1 to 1.5 parts by weight sulfur and from 0.5 to 6 parts by weight of at least one sulfur vulcanizing accelerator. The premolded EPDM pipe flashing composition provides dimensional stability substantially equivalent to conventional black EPDM roofing membranes and meets the weathering, UV and heat aging resistance requirements as well as the viscosity, low temperature flexibility, and cured physical properties desired of commercial EPDM pipe flashing compositions.
一种预成型三元
乙丙橡胶(EP
DM)管道闪蒸组合物,包括按重量计 100 份的弹性聚合物,其中按重量计约 70 至 95 份的至少一种无定形
乙烯-
丙烯-二烯三元共聚物和按重量计 5 至约 30 份的至少一种结晶或半结晶
乙烯-
丙烯-二烯三元共聚物;每 100 份聚合物中含有约 35 至 175 份(按重量计)从增强和非增强材料及其混 合物所组成的组中选出的填料;每 100 份聚合物中含有约 30 至 110 份(按重量 计)加工材料及其混合物;以及每 100 份聚合物中含有约 0.6 至 7.5 份(按重量 计)从增强和非增强材料及其混合物所组成的组中选出的填料。按重量计,每 100 份聚合物含有 6 至 7.5 份固化包,固化包包括按重量计约 0.1 至 1.5 份
硫磺和按重量计 0.5 至 6 份至少一种
硫磺硫化
促进剂。这种预成型的三元
乙丙橡胶(EP
DM)管道泛
水组合物的尺寸稳定性与传统的黑色三元
乙丙橡胶(EP
DM)屋顶膜基本相同,并能满足耐候性、抗紫外线和耐热老化的要求,以及商用三元
乙丙橡胶(EP
DM)管道泛
水组合物所需的粘度、低温柔性和固化物理性能。