01 Kūlana laulā

ʻO MDI (diphenylmethane diisocyanic acid) he mea polyurethane i hoʻohui ʻia e ka isocyanate, polyol a me kāna mea kōkua, i hoʻohana ʻia i nā mea hana hale, nā hale, ka halihali a me nā hiʻohiʻona ʻē aʻe.

Manaʻo ʻia ʻo MDI kekahi o nā huahana nui me nā pale ākea kiʻekiʻe loa i ka ʻoihana kemika. He lōʻihi ke kaʻina hana synthesis o isocyanate, me ka hopena o ka nitratation, ka hoʻohaʻahaʻa ʻana a me ka hopena acidification.

ʻElua mau kaʻina hana nui o MDI: phosgenation a me non-phosgenation. ʻO ke kaʻina hana Phosgene ka ʻenehana nui no ka hana ʻana i nā isocyanates i kēia manawa, a ʻo ia wale nō ke ala e hiki ai ke hoʻokō i ka hana nui o isocyanates. Eia nō naʻe, he mea ʻawaʻawa loa ka phosgene, a pono e hoʻokō ʻia ka hopena ma lalo o nā kūlana waikawa ikaika, e koi ai i nā mea hana kiʻekiʻe a me ka ʻenehana.

02 ano

Māhele ʻia ʻo MDI i ʻekolu mau ʻāpana: polymer MDI, MDI maʻemaʻe a me MDI i hoʻololi ʻia:

ʻO ka MDI Polymerized he mea maka no ka hana ʻana i ka polyurethane hard foam a me ka semi-hard foam, a ua hoʻohana nui ʻia kāna mau huahana i hoʻopau ʻia i loko o ka friji, nā mea hoʻonaninani wela, nā ʻāpana ʻoki kaʻa a me nā ʻoihana ʻē aʻe.

Hoʻohana nui ʻia ʻo MDI maʻemaʻe i ka hana ʻana i nā ʻano like ʻole o ka polyurethane elastomers, ka hapa nui i hoʻohana ʻia i ka hana ʻana o ka thermoplastic polyurethane elastomers, spandex, PU ʻili slurry, kāmaʻa adhesives, a hoʻohana pū ʻia i nā mea microporous elastomer, e like me nā soles, nā paʻa paʻa, ponoʻī. -ʻo ka ʻūhā, nā pahu kaʻa, nā ʻāpana ʻoki o loko, a me ka hana ʻana i nā elastomers polyurethane cast.

Ma ke ʻano he derivative o nā huahana MDI series, ʻo MDI i hoʻololi ʻia he hoʻonui ʻenehana o ka MDI maʻemaʻe a me nā huahana MDI polymerized i hoʻohana mau ʻia ma ka mākeke i kēia manawa, a hiki ke hāʻawi i ka hoʻohana kūʻokoʻa a me ka hoʻoili ʻana i nā waiwai e like me ka ʻokoʻa o ka hoʻolālā hoʻolālā huahana a me ke kaʻina hana synthesis, no laila. e like me ka hoʻohana nui ʻia i nā ʻōpū palupalu, elastomers, nā uhi, nā mea hoʻopili a me nā māla ʻē aʻe.

03 Ma luna a ma lalo o ke kaulahao ʻoihana

Iuka no ka aila, ke kinoea maoli, ka hao a me na waiwai e ae;

ʻO ka waena waena he mau kemika ma waena o nā mea maka a me nā huahana hope loa, e hōʻike ana iā WH Chemical, WX petrochemical, etc.

ʻO ka lalo o nā huahana kemika hope loa, e like me nā plastics, rubber, pesticides, fertilizers, etc., e hōʻike ana i ka hui JF Technology, LL tires, RL chemicals, HR Hengsheng, etc.

04 Ka nānā ʻana i nā koi a me nā ʻokoʻa o ka mākeke

ʻO ka polyurethane i hanaʻia e MDI he nui nāʻano hana i lalo, i hoʻohana nuiʻia i kaʻoihana kūkulu hale, nā mea hana hale, nā mea hana hale, nāʻoihana kaʻa, nā kāmaʻa kāmaʻa, a pēlā aku.

Mai kahi hiʻohiʻona honua, ʻo ka nui o ka hoʻohana ʻana o ka MDI polymerized i 2021 ka nui: 49% no ka ʻoihana kūkulu, 21% no nā mea hana hale, 17% no nā mea hoʻopili, a me 11% no nā kaʻa.

Mai ka hiʻohiʻona home, ʻo ka hapa nui o ka hoʻohana ʻana i ka MDI polymerized i 2021 ka mea nui: 40% no nā waiwai keʻokeʻo, 28% no ka ʻoihana kūkulu, 16% no nā adhesives, a me 7% no nā kaʻa.

05 Mahele hoʻokūkū

Hōʻike ka ʻaoʻao hoʻolako o MDI i ke ʻano hoʻokūkū o oligopoly. ʻEwalu mau mea hana MDI nui ma ka honua, a ʻo nā mea hana ʻekolu kiʻekiʻe ma ka mana ʻo WH Chemical, BASF a me Covestro, me ka hui pū ʻana o nā ʻoihana ʻekolu i ʻoi aku ma mua o 60% o ka nui o ka mana hana o ka honua. Ma waena o lākou, ʻo WH Chemical ka ʻoihana alakaʻi i ka ʻoihana MDI o Kina a me ka ʻoihana hana MDI nui loa o ka honua.