Hoʻolauna iā EPDM
ʻO ka EPDM he terpolymer o ka ethylene, propylene a me nā diene non-conjugated, i hoʻomaka i ka hana pāʻoihana ma 1963. ʻO ka hoʻohana makahiki o ka honua he 800000 tons. ʻO ka hiʻohiʻona nui o ka EPDM ʻo ia kona kūpaʻa oxidation kiʻekiʻe, ka pale ozone a me ke kūpaʻa corrosion. No ka EPDM no ka ʻohana polyolefin (PO), loaʻa iā ia nā waiwai vulcanization maikaʻi loa. Ma waena o nā ʻōpala āpau, ʻo ka EPDM ka haʻahaʻa haʻahaʻa haʻahaʻa haʻahaʻa a hiki ke komo i ka nui o nā mea hoʻopihapiha a me ka ʻaila me ka ʻole o ka pili ʻana i nā waiwai. No laila, hiki iā ia ke hoʻohua i nā pūhui lāʻau haʻahaʻa.
Hana
- Haʻahaʻa haʻahaʻa a me ka hoʻopiha kiʻekiʻe
He haʻahaʻa haʻahaʻa ko Ethylene-propylene rubber he 0.87. Eia hou, hiki ke hoʻopihaʻia ka nui o kaʻaila a me ka mea hoʻopihapiha hoʻopihapiha, hiki ke hoʻemi i ke kumukūʻai ohuahana lāʻau, E hoʻopau i nā hemahema o ke kumukūʻai kiʻekiʻe o ka EPDM raw rubber, a no ka EPDM me ka waiwai Mooney kiʻekiʻe, ʻaʻole i hoʻemi nui ʻia ka ikaika kino a me ka mechanical ma hope o ka hoʻopiha piha ʻana.
- Kūʻē ʻelemakule
ʻO ka ethylene-propylene rubber ka maikaʻi loa o ka wā, ke kū'ē ozone, ke kū'ē wela, kaʻakika a me ka alkali, ke kū'ēʻana o ka mahu wai, ka paʻa o ka waihoʻoluʻu, nā waiwai uila, ka hoʻopihaʻana i kaʻaila a me ka wai wela maʻamau.ʻO nā huahana ethylene-propylene rubber hiki ke hoʻohana ʻia no ka manawa lōʻihi ma 120 ℃, a hiki ke hoʻohana no ka manawa pōkole a i ʻole intermittent ma 150 - 200 ℃. Hiki ke hoʻonui ʻia ka mahana hoʻohana ma ka hoʻohui ʻana i nā antioxidant kūpono. Hiki ke hoʻohana ʻia ka EPDM crosslinked me ka peroxide ma lalo o nā kūlana koʻikoʻi. Ma lalo o ke kūlana o ka ozone o 50 pphm a me ke kiko o 30%, ʻaʻole hiki i ka EPDM ke pohā no nā hola he 150.
- ʻO ke kūpaʻa ʻino
Ma muli o ka nele o ka polarity a me ka haʻahaʻa haʻahaʻa o ka ethylene-propylene rubber, he kūʻē maikaʻi ia i nā ʻano mea like ʻole polar e like me ka waiʻona, ka waikawa, ka alkali, oxidant, refrigerant, detergent, holoholona a me ka aila mea kanu, ketone a me ka momona; Eia nō naʻe, ʻaʻohe paʻa i nā aliphatic a me nā mea hoʻoheheʻe ʻala (e like me ka ʻaila, benzene, etc.) a me nā aila mineral. Ma lalo o ka hana lōʻihi o ka acid concentrated, e emi ana ka hana.
- Kūleʻa mahu wai
He ʻoi aku ka maikaʻi o ka EPDM ma mua o kona kūpaʻa wela. I loko o 230 ℃ superheated mahu, ʻaʻohe loli i ka helehelena ma hope o 100 mau hola. Eia nō naʻe, ma lalo o nā kūlana like, ua ʻike ʻia ka ʻōpala fluorine, ka lāʻau silika, ka lāʻau fluorosilicone, ka lāʻau butyl, ka nitrile a me ka ʻōpala maoli i ʻike i ka emi ʻana o ka helehelena i ka manawa pōkole.
- Kūleʻa wai wela
ʻO ka ethylene-propylene rubber kekahi he kūʻē maikaʻi i ka wai wela, akā pili pili ia i nā ʻōnaehana hoʻōla āpau. Ua loli iki nā waiwai mechanical o ka ethylene-propylene rubber me ka morpholine disulfide a me TMTD ma ke ʻano he ʻōnaehana hoʻōla ma hope o ka hoʻomoʻa ʻana i ka wai wela 125 ℃ no 15 mau mahina, a ʻo ka nui o ka hoʻonui ʻana he 0.3% wale nō.
- Hana uila
ʻOi aku ka maikaʻi o ka ʻili uila a me ka pale ʻana o ka ethylene-propylene, a ʻoi aku ka maikaʻi o kāna mau waiwai uila ma mua a kokoke paha i nā mea o ka styrene-butadiene rubber, chlorosulfonated polyethylene, polyethylene a me ka polyethylene cross-linked.
- Elasticity
No ka mea, ʻaʻohe polar substituent i loko o ka molecular structure of ethylene-propylene rubber and the molecular cohesion energy is haʻahaʻa, hiki i ke kaulahao molecular ke hoʻomau i ka maʻalahi ma kahi ākea, ʻelua wale nō i ka lāʻau kūlohelohe a me ka lāʻau cis-polybutadiene, a hiki ke hoʻomau ma haʻahaʻa wela.
- Hoʻopili
Ma muli o ka nele o nā pūʻulu hana i loko o ka molecular structure oethylene-propylene rubber, ka ikehu cohesion haʻahaʻa, a me ka maʻalahi hau e hoʻopuʻi ʻia o ka hui ʻana i ka lāʻau lapaʻau, ʻo ka hoʻopili ponoʻī a me ka hoʻopili like ʻana he ʻilihune loa.
Pōmaikaʻi
- Loaʻa iā ia kahi lākiō hoʻokō kiʻekiʻe. ʻO 0.86 ~ 0.90g/cm3 wale nō ka nui o ka ʻōpala maka, ʻo ia ka mea maʻamau maʻamau me ka māmā māmā o ka ʻōpala maka; Hiki ke hoʻopiha ʻia i nā mea nui e hōʻemi i ke kumukūʻai o ka hui ʻana.
- ʻO ke kūpaʻa ʻelemakule maikaʻi loa, ka pale ʻana i ka wā, ka pale ʻana o ka ozone, ka pale ʻana o ka lā, ka pale ʻana i ka wela, ka pale wai, ke kū ʻana o ka mahu wai, ka pale ʻana o UV, ka pale ʻana i ka radiation a me nā mea kahiko ʻē aʻe. Ke hoʻohana pū ʻia me nā ʻōpala diene unsaturated e like me NR, SBR, BR, NBR, a me CR, hiki i ka EPDM ke pāʻani i ka hana o ka polymer antioxidant a i ʻole antioxidant.
- ʻO ke kūpaʻa kemika maikaʻi loa, ka waikawa, ka alkali, ka mea holoi, ka aila holoholona a me ka mea kanu, ka waiʻona, ketone, etc. Paipai maikaʻi i ka wai, ka wai wela a me ka mahu; Kū'ē i kaʻaila polar.
- ʻOi aku ka maikaʻi o ka hana insulation, ka leo resistivity 1016Q · cm, breakdown voltage 30-40MV/m, dielectric mau (1kHz, 20 ℃) 2.27.
- Hoʻohana ʻia ia i kahi ākea ākea, me ka haʻahaʻa haʻahaʻa haʻahaʻa o - 40 ~ - 60 ℃, a hiki ke hoʻohana ʻia ma 130 ℃ no ka manawa lōʻihi.
Ka manawa hoʻouna: Jan-10-2023
