I kēia lā e hoʻolauna mākou i ʻekolu mau mea nui no ka ʻupena epe, ʻo ia ka LDPE HDPE PP.

一、ʻO ka ʻokoʻa nui ma waena o LDPE (polyethylene haʻahaʻa haʻahaʻa) a me HDPE (polyethylene kiʻekiʻe kiʻekiʻe) aia i ko lākou ʻano nui, waiwai kino, hoʻohana, etc.

1. Ka nui a me ka helehelena:

Aia ka mānoanoa o LDPE ma waena o 0.910-0.940g/cm³, aʻo ka nui o HDPE ma waena o 0.940-0.976g/cm³.

He ʻano keʻokeʻo waiu ko LDPE a he translucent i kekahi ʻano ma nā ʻāpana lahilahi, ʻoiai ʻo HDPE he opaque maʻamau a he keʻokeʻo keʻokeʻo a me ka translucent ke nānā aku.

2. Nā waiwai kino:

ʻAno palupalu ʻo LDPE, ʻoʻoleʻa maikaʻi, ʻike maopopo maikaʻi, a me ka manaʻo pahee. Loaʻa ʻole ka paʻa ʻana o ka dimensional i ka wā o ka hana ʻana a me ka hana ʻana, a paʻakikī ke hoʻopili.

He kiʻekiʻe ka ikaika o ka HDPE, ka paʻakikī maikaʻi, a me ka rigidity ikaika, kokoke i ka PP (polypropylene), ʻoi aku ka paʻakikī ma mua o PP, a maikaʻi ke kūpaʻa wela.

3. Hoʻohana:

Loaʻa i ka LDPE ka viscosity hoʻoheheʻe haʻahaʻa, ka wai maikaʻi, a maʻalahi ke hana. He kūpono ia no ka hana ʻana i nā paipu wai inu, etc.

He kūpono ʻo HDPE no ka hana ʻana i ka papa kiʻi kiʻi, ka hoʻoheheʻe ʻia ʻana, ka papa hollow a me nā huahana kiʻiʻoniʻoni puhi ʻia, e like me nā ʻupena lawaiʻa, nā ʻōmole inu a me nā ʻeke ʻeke.

4. Ke kū'ē kemika:

Loaʻa i nā mea ʻelua ke kūpaʻa maikaʻi loa i ka hapa nui o nā kemika home a me nā ʻoihana, akā ʻoi aku ka pale ʻana o HDPE i ka waika, alkali corrosion a me nā mea hoʻoheheʻe organik.

5. Ke kū'ē i ka wela a me ke kū'ē i ka wā kahiko:

ʻAʻole maikaʻi ka LDPE i ka wela, ke kū ʻana o ka wā kahiko a me ke koʻikoʻi o ke kaiapuni e like me HDPE, a hiki ke ʻelemakule, decomposition a discoloration.

ʻO ka HDPE maikaʻi ke kūpaʻa wela kiʻekiʻe akā maikaʻi ke kūpaʻa haʻahaʻa haʻahaʻa. ʻO ka hemahema, ʻaʻole maikaʻi ka maikaʻi o kona kūpaʻa ʻelemakule a me ke koʻikoʻi o ke kaiapuni e like me LDPE.

二、ʻO nā ʻokoʻa nui ma waena o nā mea PP a me PE penei:

1. Nā mea hana: ʻO ka mea nui o ka PP he polypropylene, aʻo ka mea nui o ka PE he polyethylene.

2. Nā hiʻohiʻona: ʻO ka PP ka mea maʻamau i kahi paʻa translucent colorless, odorless a me nā mea ʻawaʻawa ʻole, me ke kūpaʻa wela kiʻekiʻe, ke aniani, ka ikaika mechanical a me nā ʻano ʻē aʻe; ʻO ka PE he mea hoʻopili meaʻai i ʻike ʻia ma ka honua, ʻaʻohe mea ʻawaʻawa, ʻono ʻole, ʻaʻohe ʻala, manaʻo e like me ka wax, hoʻokō i nā kūlana maʻemaʻe no ka hoʻopili ʻana i nā meaʻai, he ductility maikaʻi, ʻaʻole maʻalahi i ka pōʻino, a maikaʻi loa ka wela.

3. Ka laulā o ka hoʻohana ʻana: Hiki ke hoʻohana ʻia ʻo PP no ka hana ʻana i nā awnings greenhouse air, mulch films, culture bottles, etc., a hiki ke hoʻohana ʻia no ka hana ʻana i nā pahu huli meaʻai, nā ʻeke meaʻai, a me nā mea ʻē aʻe. , injection molding a me nā ʻano hana ʻē aʻe, a hoʻohana nui ʻia i ka hana ʻana i nā kiʻiʻoniʻoni, nā huahana hollow, etc.