ʻO ka ʻōpala EPDM (ethylene propylene diene monomer rubber) kahi ʻano o ka lāʻau synthetic i hoʻohana ʻia i nā noi he nui.ʻO nā dienes i hoʻohana ʻia i ka hana ʻana i nā ʻōpala EPDM he ethylidene norbornene (ENB), dicyclopentadiene (DCPD), a me vinyl norbornene (VNB).4-8% o kēia mau monomers i hoʻohana maʻamau.ʻO EPDM kahi pahu M-Class ma lalo o ke kūlana ASTM D-1418;ʻO ka papa M aia nā elastomers me ke kaulahao piha o ke ʻano polyethylene (ʻo ka M e loaʻa ana mai ka huaʻōlelo polymethylene pololei loa).Hana ʻia ʻo EPDM mai ka ethylene, propylene, a me kahi comonomer diene e hiki ai ke hoʻopili ʻia ma o ka vulcanization sulfur.ʻO ka ʻohana mua o EPDM ʻo ia ʻo EPR, ethylene propylene rubber (pono no nā kaula uila uila kiʻekiʻe), ʻaʻole i loaʻa mai nā precursors diene a hiki ke hoʻopili wale ʻia me ka hoʻohana ʻana i nā ʻano radical e like me peroxides.
E like me ka hapa nui o nā ʻōpala, hoʻohana mau ʻia ʻo EPDM me nā mea hoʻopihapiha e like me ke kalapona ʻeleʻele a me ka calcium carbonate, me nā mea plasticiser e like me nā aila paraffinic, a loaʻa nā waiwai rubbery pono wale nō ke hoʻopili ʻia.Hana ʻia ka crosslinking ma o ka vulcanization me ka sulfur, akā hoʻokō ʻia me nā peroxides (no ka pale ʻana i ka wela) a i ʻole me nā resins phenolic.Hoʻohana ʻia ka radiation ikaika kiʻekiʻe e like me nā kukuna electron i kekahi manawa no ka hana ʻana i nā huʻi a me ka uea a me ke kaula.
Ka manawa hoʻouna: Mei-15-2023