Nā ʻokoʻa o LDPE, HDPE, a me LLDPE

ʻO ka polyethylene kekahi o nā resins synthetic nui ʻelima, a ʻo Kina ka mea lawe mai a ʻo ka lua o ka mea kūʻai aku o ka polyethylene. Hoʻokaʻawale nui ʻia ka polyethylene i ka polyethylene kiʻekiʻe kiʻekiʻe (HDPE), polyethylene haʻahaʻa haʻahaʻa (LDPE), polyethylene haʻahaʻa haʻahaʻa laina (LLDPE) ʻekolu mau ʻāpana.

Hoʻohālikelike i nā waiwai o nā mea HDPE, LDPE a me LLDPE 

Polyethylene kiʻekiʻe

ʻO ka HDPE ʻaʻohe mea ʻawaʻawa, ʻono ʻole, ʻala ʻole, a loaʻa ka density o 0.940 ~ 0.976g/cm3, ʻo ia ka huahana o ka polymerization ma lalo o nā kūlana haʻahaʻa haʻahaʻa ma lalo o ka catalysis o Ziegler catalyst, no laila ua ʻike ʻia ka polyethylene kiʻekiʻe he haʻahaʻa haʻahaʻa. polyethylene.

pono:

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

Con:

ʻO ka pōʻino, ʻaʻole maikaʻi ka maikaʻi o ka pale ʻana i ka wā kahiko 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 ka polyethylene kiʻekiʻe i nā antioxidants a me nā mea hoʻonaninani ultraviolet e hoʻomaikaʻi i kona mau hemahema i ka wā e hana ai i ka ʻōwili plastik.

ʻO Polyethylene haʻahaʻa haʻahaʻa

ʻAʻole ʻawaʻawa ʻo LDPE, ʻono ʻole, ʻala ʻole, a loaʻa iā ia 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, ʻike ʻia hoʻi he polyethylene kiʻekiʻe.

pono:

ʻO ka polyethylene haʻahaʻa haʻahaʻa ka ʻano māmā loa o ka resin polyethylene. Ke hoʻohālikelike ʻia me ka polyethylene kiʻekiʻe, ʻoi aku ka haʻahaʻa o kona crystallinity (55% -65%) a me ka wahi palupalu (90-100 ℃). Loaʻa iā ia ka palupalu maikaʻi, extensibility, transparency, pale anuanu a me ka processability. He maikaʻi kona kūpaʻa kemika, hiki ke kū i ka waika, alkali a me ka wai paʻakai; ʻO ka insulation uila maikaʻi a me ke kinoea permeability; Haʻahaʻa haʻahaʻa wai; Maʻalahi e puhi. He palupalu ka waiwai, me ka hoʻonui maikaʻi ʻana, ka insulation uila, ke kūpaʻa kemika, ka hana ʻana a me ke kūpaʻa haʻahaʻa haʻahaʻa (kūʻē i -70 ℃).

Con:

ʻO ka hemahema, ʻo kona ikaika mechanical, ka hoʻoheheʻe ʻana i ka wai, ka hoʻokaʻawale ʻana i ke 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 crystallization (108-126 ℃). ʻOi aku ka haʻahaʻa o kona ikaika mechanical ma mua o ka polyethylene kiʻekiʻe, ʻo kona anti-seepage coefficient, ka pale ʻana i ka wela a me ka pale ʻana i ka wā kahiko he ʻilihune, a ua maʻalahi ka decompose a discolor ma lalo o ka lā a i ʻole ka wela kiʻekiʻe, e hopena i ka emi ʻana o ka hana. no laila hoʻohui ka polyethylene haʻahaʻa haʻahaʻa i nā antioxidants a me nā mea hoʻoheheʻe ultraviolet e hoʻomaikaʻi i kona mau hemahema i ka wā e hana ai i nā ʻāpana plastik.

Linear Low Density Polyethylene

ʻAʻole ʻawaʻawa ʻo LLDPE, ʻono ʻole, ʻala ʻole, a loaʻa ka mānoanoa ma waena o 0.915 a me 0.935g/cm3. He copolymer ia o ka ethylene a me kahi helu liʻiliʻi o ka alpha-olefin kiʻekiʻe (e like me butene-1, hexene-1, octene-1, tetrmethylpentene-1, etc.) polymerized ma lalo o ke kaomi kiʻekiʻe a i ʻole ke kaomi haʻahaʻa ma lalo o ka hana a kahi catalyst. . Hōʻike ʻia ke ʻano molekala o LLDPE maʻamau e kona iwi kuamoʻo laina, me nā kaulahao lālā liʻiliʻi a ʻaʻole lōʻihi, akā aia kekahi mau kaulahao lālā pōkole. ʻO ka nele o nā kaulahao lālā lōʻihi e ʻoi aku ka crystalline o ka polymer.

Hoʻohālikelike ʻia me LDPE, loaʻa iā LLDPE nā mea maikaʻi o ka ikaika kiʻekiʻe, ka paʻakikī maikaʻi, ka rigidity ikaika, ka pale ʻana i ka wela, ke kū anuanu, a me nā mea ʻē aʻe. nā mea hoʻoheheʻe organik a pēlā aku.

ʻano hoʻokaʻawale

LDPE: ʻIke ʻike ʻike: ʻoluʻolu; He keʻokeʻo keʻokeʻo, akā he awelika ka ʻike. ʻIke ʻana i ke ahi: ʻā ʻia ka lapalapa ahi melemele a me ka uliuli; Ke puhi ʻana i ka uahi ʻole, aia kahi ʻala paraffin, hoʻoheheʻe ʻia, maʻalahi ke huki uea.

LLDPE: Hiki i ka LLDPE ke pehu me ka benzene no ka manawa lōʻihi, a lilo i palupalu i ka pilina me HCL no ka manawa lōʻihi.

HDPE: He haʻahaʻa ka mahana hana o LDPE, ma kahi o 160 degere, a he 0.918 a hiki i ka 0.932 grams / cubic centimeter ka mānoanoa. ʻOi aku ka kiʻekiʻe o ka mahana o ka HDPE, ma kahi o 180 degere, ʻoi aku ka kiʻekiʻe.

hōʻuluʻulu manaʻo

I ka hōʻuluʻulu manaʻo, hoʻokani nā ʻano mea ʻekolu ma luna i kā lākou kuleana koʻikoʻi i nā ʻano ʻenehana pale ʻana. ʻO HDPE, LDPE a me LLDPE ʻekolu mau ʻano mea i loaʻa ka insulation maikaʻi a me ka moisture-proof, impermeability, non-toxic, tasteless, odorless performance i loko o ka mahiʻai, aquaculture, artificial lakes, reservoirs, river applications are also very extended, and by the Ministry o ka Mahiai o Kina Fisheries Bureau, Shanghai Academy o Fisheries Science, ka Institute of fishery machines and instruments for promote and popularize the application.

I loko o ke kaiapuni waena o nā ʻakika ikaika, alkalis ikaika, nā mea hoʻoheheʻe ikaika a me nā mea hoʻoheheʻe organik, hiki ke pāʻani a hoʻohana maikaʻi ʻia nā waiwai waiwai o HDPE a me LLDPE, ʻoi aku ka kiʻekiʻe o HDPE ma mua o nā mea ʻelua ʻē aʻe e pili ana i ke kūʻē ʻana i nā waikawa ikaika, ikaika. nā alkalis, nā waiwai oxidation ikaika a me ke kū'ē i nā mea hoʻoheheʻe organik. No laila, ua hoʻohana piha ʻia ka HDPE anti-corrosion coil i ka ʻoihana kemika a me ka ʻoihana mālama kaiapuni.

Loaʻa i ka LDPE nā hiʻohiʻona waikawa, alkali, paʻakai paʻakai, a me ka hoʻonui maikaʻi ʻana, ka insulation uila, ke kūpaʻa kemika, ka hana ʻana a me ke kūpaʻa haʻahaʻa haʻahaʻa, no laila ua hoʻohana nui ʻia i ka mahiʻai, ka mālama ʻana i ka wai aquaculture, packaging, ʻoi aku ka haʻahaʻa haʻahaʻa. mea uwea.