Ke Kino A me Ke Kinomia o ka Polyethylene Resin
Ke Kino A me Ke Kinomia o ka Polyethylene Resin
Nā Pono Kemika
He kūpaʻa kemika maikaʻi ka Polyethylene a kūʻē i ka dilute nitric acid, dilute sulfuric acid a me kekahi ʻano o ka waikawa hydrochloric, hydrofluoric acid, phosphoric acid, formic acid, acetic acid, ammonia water, amines, hydrogen peroxide, sodium hydroxide, potassium hydroxide, etc. . ka hopena. Akā, ʻaʻole ia e kūpaʻa i ka corrosion oxidative ikaika, e like me ka fuming sulfuric acid, concentrated nitric acid, chromic acid a me ka hui ʻana o ka sulfuric acid. Ma ka lumi wela, e hoʻopau mālie nā mea hoʻoheheʻe i ʻōlelo ʻia ma luna nei i ka polyethylene, ʻoiai ma 90-100 ° C, ʻo ka sulfuric acid concentrated a me ka acid nitric concentrated e hoʻopau koke i ka polyethylene, e hoʻopau ʻia a hoʻopau ʻia paha. He mea maʻalahi ka polyethylene i ka photo-oxidized, thermally oxidized, decomposed e ka ozone, a hiki ke hoʻohaʻahaʻa ʻia ma lalo o ka hana a nā kukuna ultraviolet. ʻO ka ʻeleʻele kalapona he hopena pale māmā maikaʻi loa ma ka polyethylene. Hiki ke hana ʻia nā pane e like me ka hoʻopili ʻana, ka ʻoki kaulahao, a me ka hoʻokumu ʻana o nā pūʻulu unsaturated ma hope o ka hoʻomālamalama ʻana.
Mechanical waiwai
ʻO nā mea mechanical o ka polyethylene he general, He haʻahaʻa ka ikaika tensile, ʻaʻole maikaʻi ke kūpaʻa creep, a maikaʻi ke kūpaʻa hopena. ʻO ka ikaika o ka hopena LDPE>LLDPE>HDPE, nā waiwai mechanical ʻē aʻe LDPE crystallinity a me ke kaumaha molekala pili, me ka hoʻomaikaʻi ʻana o kēia mau hōʻailona, hoʻonui ʻia kona mau waiwai mechanical. ʻAʻole maikaʻi ke kūʻē ʻana i ke koʻikoʻi o ke kaiapuni, akā ke piʻi ka paona molekala pili, hoʻomaikaʻi ia. ʻO ke kūpaʻa puncture maikaʻi, ma waena o LLDPE ka mea maikaʻi loa.
Nā hiʻohiʻona kaiapuni
ʻO ka polyethylene kahi polymer inert alkane me ka paʻa kemika maikaʻi. He kūpaʻa ia i ka corrosion e ka waika, alkali a me ka paʻakai aqueous solutions i ka lumi wela, akā ʻaʻole kūʻē i nā oxidants ikaika e like me ka oleum, concentrated nitric acid a me chromic acid. ʻAʻole hiki ke hoʻoheheʻe ʻia ka polyethylene i loko o nā mea hoʻoheheʻe maʻamau ma lalo o 60 ° C, akā e pehu a māha paha i ka pilina lōʻihi me ka aliphatic hydrocarbons, aromatic hydrocarbons, halogenated hydrocarbons, a me nā mea ʻē aʻe. , amyl acetate, trichloroethylene, turpentine, mineral ka aila a me ka paraffin; ke kiʻekiʻe ka mahana ma mua o 100 ℃, hiki ke hoʻoheheʻe ʻia i ka tetralma.
No ka mea, loaʻa i nā molekala polyethylene kahi liʻiliʻi o nā paʻa pālua a me nā paʻa ether, ʻo ka ʻike ʻana o ka lā a me ka ua e hoʻoulu ai i ka ʻelemakule, pono e hoʻomaikaʻi ʻia ma ka hoʻohui ʻana i nā antioxidants a me nā stabilizer māmā.
Nā hiʻohiʻona hana
No ka mea he wai maikaʻi ka LDPE a me HDPE, haʻahaʻa haʻahaʻa haʻahaʻa, viscosity haʻahaʻa, haʻahaʻa decomposition haʻahaʻa, a ʻaʻole decompose i ke kiʻekiʻe wela o 300 ℃ i ke kinoea inert, he plastics me ka hana hana maikaʻi. Eia naʻe, ʻoi aku ka kiʻekiʻe o ka viscosity o LLDPE, a pono e hoʻonui ʻia ka mana kaʻa e 20% a 30%; hiki ke hoʻoheheʻe i ka haʻihaʻi, no laila pono e hoʻonui i ka lua make a hoʻohui i nā mea kōkua; ʻoi aku ka kiʻekiʻe o ka mahana hana, a hiki i 200 a 215 °C. He haʻahaʻa ka wai o ka polyethylene a ʻaʻole pono e hoʻomaloʻo ma mua o ka hana ʻana.
ʻO ka polyethylene melt he wai non-Newtonian, a emi iho kona viscosity me ka mahana, akā e emi wikiwiki ana me ka piʻi ʻana o ka shear rate a loaʻa kahi pilina laina, ma waena o ka LLDPE ka emi ʻana o ka lohi.
He mea maʻalahi nā huahana polyethylene i ka crystallize i ka wā o ke kaʻina hoʻoluʻu, no laila, pono e uku ʻia i ka mahana o ka mold i ka wā e hana ai. I mea e hoʻomalu ai i ka crystallinity o ka huahana, i loaʻa iā ia nā waiwai like ʻole. ʻO ka polyethylene ka nui o ka hoʻoheheʻe ʻana, pono e noʻonoʻo ʻia i ka wā e hoʻolālā ai i ka mold.
Ke Kino A me Ke Kinomia o ka Polyethylene Resin