He aha ka ʻokoʻa ma waena o nā mea NBR a me EPDM?

I nā noi ʻoihana, he mea koʻikoʻi ke koho ʻana i nā mea e hōʻoia i ke kūpaʻa, ka hana, a me ke kumukūʻai kūpono. ʻElua mau mea synthetic rubber i hoʻohana pinepine ʻia ʻo ka nitrile rubber (NBR) a me ka ethylene propylene diene monomer (EPDM). ʻOiai he mau waiwai a me nā noi kūikawā ko nā mea ʻelua, he mea nui ka hoʻomaopopo ʻana i ko lākou ʻokoʻa i ke koho ʻana i ka mea kūpono no nā pono kikoʻī.

Nā Mea Hoʻohui a me nā Waiwai

He copolymer ka NBR i hana ʻia mai ka acrylonitrile a me ka butadiene. ʻO ka nui o ka acrylonitrile i loko o NBR ma waena o 18% a me 50%, kahi e hoʻopilikia ai i kona kūpaʻa ʻana i ka ʻaila a me nā waiwai mechanical. Ua kaulana ʻo NBR no kona kūpaʻa maikaʻi loa i nā ʻaila, nā wahie a me nā kemika ʻē aʻe, e lilo ia i mea koho no nā noi kaʻa a me nā ʻoihana e pili pinepine ana me kēia mau mea. Loaʻa iā NBR ka ikaika tensile maikaʻi, ke kūpaʻa abrasion a me ka maʻalahi, he mea koʻikoʻi ia no nā sila, nā gaskets a me nā hoses.

ʻO ka EPDM, ma ka ʻaoʻao ʻē aʻe, he terpolymer i hana ʻia mai ka ethylene, propylene, a me kahi ʻāpana diene. Hāʻawi kēia ʻano hana kūikawā iā EPDM i ke kūpaʻa maikaʻi loa i ka wā, ke kūpaʻa UV, a me ke kūpaʻa ozone. He kūpono loa ka EPDM no nā noi waho e like me nā membrane roofing, nā weatherstripping automotive, a me nā sila e pono ai ke kū i nā kūlana kaiapuni ʻino. Eia kekahi, noho maʻalahi ka EPDM i nā mahana haʻahaʻa, e lilo ia i koho kūpono no nā noi aniau anuanu.

Ke kūpaʻa wela

ʻO ke kūpaʻa wela kiʻekiʻe kekahi ʻokoʻa koʻikoʻi ma waena o NBR a me EPDM. Hana maikaʻi ʻo NBR ma kahi pae mahana o -40°C a i 100°C (-40°F a i 212°F), ma muli o ke ʻano kikoʻī. Eia nō naʻe, ʻo ka lōʻihi o ka hoʻohana ʻana i nā mahana kiʻekiʻe hiki ke hoʻohaʻahaʻa. I ka hoʻohālikelike ʻana, hiki i ka EPDM ke kū i kahi pae mahana ākea, mai -50°C a i 150°C (-58°F a i 302°F), e lilo ia i koho kūpono no nā noi e pono ai ka elasticity kiʻekiʻe i nā kūlana koʻikoʻi.

Ke kū'ē kemika

Ma ke ʻano o ke kūpaʻa kemika, hana maikaʻi ʻo NBR i nā wahi i loaʻa nā aila a me nā wahie. Ma muli o kona hiki ke kū i nā huahana petroleum, hoʻohana pinepine ʻia ʻo NBR i ka ʻoihana kaʻa no nā hose wahie, nā O-ring, a me nā sila. Eia nō naʻe, ʻaʻole maikaʻi ke kūpaʻa o NBR i nā polar solvents, nā waikawa, a i ʻole nā ​​​​​​bases, hiki ke hoʻoulu iā ia e pehu a palaho paha.

ʻO ka EPDM, ma ka ʻaoʻao ʻē aʻe, he kūpaʻa loa ia i ka wai, ka mahu, a me nā ʻano kemika like ʻole, me nā waikawa a me nā kumu. ʻO kēia ka mea kūpono no ka ʻoihana hana kemika a no nā noi waho kahi i hōʻike pinepine ʻia ai i ka makū. Eia nō naʻe, ʻaʻole kūpono ka EPDM no ka hoʻohana ʻana me nā aila a me nā wahie, no ka mea, pehu a nalowale kona mau waiwai mechanical.

noi

Hōʻike ka hoʻohana ʻana o NBR a me EPDM i kona mau waiwai kūikawā. Hoʻohana nui ʻia ʻo NBR i nā ʻōnaehana wahie, nā gaskets a me nā sila ma ke kahua kaʻa, a me nā noi ʻoihana e like me nā sila aila a me nā hose. ʻO kona kūpaʻa ʻana i ka aila e lilo ia i mea pono nui i nā wahi i hōʻike ʻia i nā huahana petroleum.

I ka hoʻohālikelike ʻana, ʻoi aku ka maikaʻi o ka EPDM no nā noi e pono ai ke kūpaʻa i ka wā, e like me ka uhi hale, nā sila puka makani, a me ka wehe ʻana i ke aniau o nā kaʻa. ʻO kona kūpaʻa ʻana i ka UV a me ka ozone e kūpono ia no ka hoʻohana ʻana i waho, e hōʻoiaʻiʻo ana i kona lōʻihi a me ka hana ʻana i nā kūlana ʻino.

I ka hōʻuluʻulu manaʻo, ʻo ke koho ʻana o nā mea NBR a me EPDM e pili ana i nā pono noi kikoʻī. ʻO NBR ka mea i koho ʻia no ke kūpaʻa ʻana i ka ʻaila a me ka wahie, ʻoiai ʻo EPDM e ʻoi aku ka maikaʻi ma nā noi e pono ai ke kūpaʻa i ka wā a me ka ozone. ʻO ka hoʻomaopopo ʻana i nā ʻokoʻa o ka haku mele ʻana, nā waiwai, ke kūpaʻa wela kiʻekiʻe, ke kūpaʻa kemika, a me nā noi e kōkua i nā mea hana a me nā ʻenekinia e hana i nā hoʻoholo naʻauao i ke koho ʻana i ka mea kūpono e hoʻokō ai i kā lākou mau pono.

Loaʻa iā Kingflex nā huahana insulation NBR a me EPDM. Inā he nīnau kāu, e ʻoluʻolu e hoʻouna i ka nīnau i ka hui Kingflex i kēlā me kēia manawa.