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 nui i nā ʻano ʻenehana pale ʻana i ka ʻenekini. 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 of Agriculture of China Fisheries Bureau, Shanghai Academy of 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.

Hoʻohui Pākuʻi:

Hoʻokaʻawale i ka polyethylene kiʻekiʻe kiʻekiʻe (HDPE) mai LDPE ʻOkoʻa ma waena o LLDPE a me LDPE He aha ka ʻokoʻa ma waena o LDPE a me PE?