Ka ʻike kumu e pili ana i ʻekolu ʻano o ka mea PE (I)

1. Polyethylene kiʻekiʻe (HDPE)

ʻAʻole ʻawaʻawa ʻo HDPE, ʻono a ʻala ʻole, me ka nui o 0.940-0.976g/cm3.ʻO ia ka huahana o ka polymerization ma lalo o ke kaomi haʻahaʻa ma lalo o ka catalysis o Ziegler catalyst, no laila ua kapa ʻia ka polyethylene kiʻekiʻe kiʻekiʻe i ka polyethylene haʻahaʻa haʻahaʻa.

Pōmaikaʻi:

ʻO HDPE kahi ʻano o ka resin thermoplastic me ka crystallinity kiʻekiʻe a me ka non-polarity i hana ʻia e ka copolymerization o ka ethylene.ʻO ka hiʻohiʻona o ka HDPE mua he keʻokeʻo waiū, a he translucent i kekahi ʻano ma ka ʻāpana lahilahi.He kūpaʻa maikaʻi loa ia i ka hapa nui o nā hale a me nā kemika ʻoihana, a hiki iā ia ke pale i ka corrosion a me ka hoʻoheheʻe ʻana o nā oxidants ikaika (concentrated nitric acid), acid-base paʻakai a me nā mea hoʻoheheʻe organik (carbon tetrachloride).ʻAʻole hygroscopic ka polymer a he kūpaʻa maikaʻi ka mahu wai a hiki ke hoʻohana ʻia no ka makū a me ka pale ʻana.

Pōkole:

ʻO ka hemahema, ʻaʻole maikaʻi ka maikaʻi o kona kūpaʻa ʻelemakule a me ke koʻikoʻi o ke kaiapuni e like me LDPE, ʻoi aku ka maikaʻi o ka thermal oxidation e hōʻemi i kāna hana, no laila, hoʻohui ʻo HDPE i nā antioxidants a me nā UV absorbers i ka wā e hana ʻia ai i nā coils plastic e hoʻomaikaʻi i kāna hana.hemahema.

2. Polyethylene haʻahaʻa haʻahaʻa (LDPE)

ʻAʻole ʻawaʻawa ʻo LDPE, ʻono ʻole a ʻala ʻole, me ka nui o 0.910-0.940g/cm3.Hoʻopili ʻia me ka oxygen a i ʻole organik peroxide ma ke ʻano he catalyst ma lalo o ke kaomi kiʻekiʻe o 100-300MPa.Kapa ʻia ʻo ia ka polyethylene kiʻekiʻe.ʻO LDPE ka mea maʻamau i kapa ʻia ʻo ka paipu PE ma ka ʻoihana irrigation.

Pōmaikaʻi:

ʻO ka polyethylene haʻahaʻa haʻahaʻa ka māmā loa o nā resins polyethylene.Ke hoʻohālikelike ʻia me HDPE, ʻoi aku ka haʻahaʻa o kona crystallinity (55% -65%) a me ka wahi palupalu (90-100 ℃);loaʻa iā ia ka flexibility maikaʻi, extensibility, transparency, ke anu anuanu a me ka processability;kona kemika Paʻa maikaʻi, ka waikawa, ka alkali a me ka wai paʻakai;maikaʻi ka uila uila a me ka ea permeability;haʻahaʻa haʻahaʻa wai;oluolu e puhi.He palupalu i ke ʻano a loaʻa ka extensibility maikaʻi, insulation uila, kūpaʻa kemika, hana hana a me ke kūpaʻa haʻahaʻa haʻahaʻa (hiki ke kū i -70 ° C).

Pōkole:

ʻO ka hemahema, ʻo kona ikaika mechanical, ka pale ʻana i ka wai, ka pale kinoea a me ka pale ʻana i ka solvent.ʻAʻole lawa ka molecular structure, haʻahaʻa ka crystallinity (55% -65%), a haʻahaʻa hoʻi ka helu hoʻoheheʻe crystalline (108-126 ° C).ʻOi aku ka haʻahaʻa o kona ikaika mechanical ma mua o ka polyethylene kiʻekiʻe, a ʻilihune kona ʻano impermeability coefficient, ka wela a me ka pale ʻana o ka lā.Hoʻohui ʻia nā antioxidants a me nā absorbers UV e hoʻoponopono i kona mau hemahema.