01 Āhuatanga whānui

Ko te MDI (diphenylmethane diisocyanic acid) he rauemi polyurethane i hangaia mā te isocyanate, te polyol me tōna kaihoko āwhina, e whakamahia ana i roto i ngā taputapu whare, ngā whare, ngā waka me ētahi atu whakaaturanga.

Ko te MDI tētahi o ngā hua papatipu he nui rawa ngā arai whānui i roto i te umanga matū. He roa te tukanga hanga o te isocyanate, tae atu ki te tauhohenga nitration, te tauhohenga whakaiti me te tauhohenga waikawa.

E rua ngā tukanga matua o te whakaputa MDI: te whakapūtanga me te kore-whakapūtanga. Ko te tukanga whakapūtanga te hangarau matua mō te whakaputa ā-ahumahi o ngā isocyanates i tēnei wā, ā, koinei anake te tikanga ka taea te whakatutuki i te whakaputanga nui o ngā isocyanates. Heoi, he tino paitini te whakapūtanga, ā, me whakahaere te tauhohenga i raro i ngā āhuatanga waikawa kaha, e hiahia ana ki ngā taputapu me ngā hangarau teitei.

02 whakarōpū

Ko te MDI e wehea whānuitia ana kia toru ngā wāhanga: te MDI pūmua, te MDI parakore me te MDI whakarerekētia:

Ko te MDI kua whakapūhuitia he rauemi mata mō te hanga pahuka mārō polyurethane me te pahuka āhua-mārō, ā, e whakamahia whānuitia ana ōna hua kua oti i roto i te pouaka whakamātao, ngā rauemi whakamahana, ngā wāhanga whakapaipai motuka me ētahi atu ahumahi.

Ko te MDI parakore e whakamahia nuitia ana mō te hanga i ngā momo elastomers polyurethane, e whakamahia whānuitia ana mō te hanga elastomers polyurethane thermoplastic, spandex, paru hiako PU, piripiri hu, ā, e whakamahia ana hoki mō ngā rauemi elastomer microporous, pērā i ngā kapu waewae, ngā potae totoka, te pahuka kiri-ake, ngā parepare waka, ngā wāhanga whakapaipai o roto, me te hanga elastomers polyurethane whakarewa.

Hei putanga mai i ngā hua raupapa MDI, ko te MDI whakarerekētia he toronga hangarau o te MDI parakore me ngā hua MDI polymerized e whakamahia whānuitia ana i te mākete i tēnei wā, ā, ka taea te whakarato i ngā āhuatanga whakamahinga me te tukatuka ahurei e ai ki te rerekētanga o te hoahoa hanganga hua me te tukanga hanga, kia whānuitia ai te whakamahi i roto i ngā mirumiru ngohengohe, ngā elastomers, ngā paninga, ngā piripiri me ētahi atu mara.

03 Te awa whakarunga me te awa whakararo o te mekameka ahumahi

Te awa whakarunga mō te hinu, te hau māori, te rino me ētahi atu rauemi;

Ko ngā toronga waenga ko ngā matū i waenganui i ngā rauemi mata me ngā hua whakamutunga o muri mai, e tohu ana i a WH Chemical, WX petrochemical, me ētahi atu.

Ko te wāhanga o raro ko ngā hua matū whakamutunga, pērā i te kirihou, te rapa, ngā patupatu pepeke, ngā maniua, me ētahi atu, e tohu ana i te kamupene JF Technology, LL tires, RL chemicals, HR Hengsheng, me ētahi atu.

04 Te tātaritanga tono me ngā rerekētanga mākete

He whānuitia ngā whakamahinga o te polyurethane i hangaia e te MDI, ā, e whakamahia ana i roto i te umanga hanga, te umanga kāinga, ngā taputapu whare, te umanga kawe waka, te umanga hu, me ētahi atu. Nō reira, he hononga tata te whakamahinga o te MDI ki te nui o te oranga ōhanga o te ao.

Mai i te tirohanga ā-ao, ko te hanganga whakapaunga katoa o te MDI polymerized i te tau 2021 ko te nuinga: 49% mō te umanga hanga, 21% mō ngā taputapu kāinga, 17% mō ngā piripiri, me te 11% mō ngā motuka.

Mai i te tirohanga ā-rohe, ko te ōwehenga o te hanganga kai MDI polymerized i te tau 2021 ko te nuinga: 40% mō ngā taonga mā, 28% mō te umanga hanga, 16% mō ngā piripiri, me te 7% mō ngā motuka.

05 Tauira whakataetae

Ko te taha tuku o te MDI e whakaatu ana i te tauira whakataetae o te oligopoly. E waru ngā kaihanga MDI nui o te ao, ā, ko ngā kaihanga matua e toru ko WH Chemical, BASF me Covestro, ā, ko te kaha o ngā umanga e toru e neke atu ana i te 60% o te kaha whakaputa katoa o te ao. I roto i a rātou, ko WH Chemical te umanga matua i roto i te umanga MDI o Haina, me te umanga hanga MDI nui rawa atu o te ao.