01 Boemo bo akaretsang

MDI (diphenylmethane diisocyanic acid) ke thepa ea polyurethane e entsoeng ke isocyanate, polyol le moemeli oa eona ea thusang, e sebelisoang lisebelisoa tsa ntlo, mehaho, lipalangoang le lipapali tse ling.

MDI e nkoa e le e 'ngoe ea lihlahisoa tse ngata tse nang le litšitiso tse phahameng ka ho fetisisa indastering ea lik'hemik'hale. Ts'ebetso ea motsoako oa isocyanate e telele, ho kenyelletsa karabelo ea nitration, karabelo ea phokotso le karabelo ea asiti.

Ho na le mekhoa e 'meli ea mantlha ea tlhahiso ea MDI: phosgenation le non-phosgenation. Phosgene process ke theknoloji e ka sehloohong ea tlhahiso ea liindasteri tsa isocyanate hajoale, hape ke eona feela mokhoa o ka fihlelang tlhahiso e kholo ea li-isocyanate. Leha ho le joalo, phosgene e chefo haholo, 'me karabelo e lokela ho etsoa tlas'a maemo a matla a acid, a hlokang lisebelisoa tse phahameng le theknoloji.

02 mofuta

MDI ka kakaretso e arotsoe ka mekhahlelo e meraro: polymer MDI, MDI e hloekileng le MDI e fetotsoeng:

Polymerized MDI ke lisebelisoa tse tala bakeng sa tlhahiso ea foam e thata ea polyurethane le foam e thata, 'me lihlahisoa tsa eona tse felileng li sebelisoa haholo ka sehatsetsing, lisebelisoa tsa ho kenya mocheso, likarolo tsa likoloi tsa likoloi le liindasteri tse ling.

MDI e hloekileng e sebelisoa haholo ha ho etsoa mefuta e fapaneng ea li-elastomer tsa polyurethane, tse sebelisoang haholo ha ho etsoa li-thermoplastic polyurethane elastomers, spandex, PU leather slurry, li-adhesives tsa lieta, hape li sebelisoa ka thepa ea microporous elastomer, joalo ka soles, lithaere tse tiileng. - crusting foam, bumpers koloi, ka hare trim likarolo, le ho etsa cast polyurethane elastomers.

E le derivative ea MDI letoto dihlahiswa, fetotsoeng MDI ke katoloso botekgeniki ea MDI e hloekileng le polymerized MDI dihlahiswa tse atisang ho sebelisoa 'marakeng hona joale,' me e ka fana ka tšebeliso e ikhethang le thepa ea ho sebetsa ho ea ka phapang ea moralo oa sebopeho sa sehlahisoa le mokhoa oa ho kopanya, kahoo e le hore e sebelisoe haholo ho li-bubble tse bonolo, li-elastomers, li-coatings, li-adhesives le masimo a mang.

03 Holimo le tlase ho ketane ea indasteri

Holimo holima oli, khase ea tlhaho, tšepe le lisebelisoa tse ling;

Libaka tse bohareng ke lik'hemik'hale pakeng tsa thepa e tala le lihlahisoa tsa ho qetela tse tlaase, tse emelang WH Chemical, WX petrochemical, joalo-joalo.

Ka tlaase ke lihlahisoa tsa ho qetela tsa lik'hemik'hale, tse kang polasetiki, rabara, chefo e bolaeang likokoanyana, manyolo, joalo-joalo, e emelang k'hamphani JF Technology, LL mabili, RL lik'hemik'hale, HR Hengsheng, joalo-joalo.

04 Tlhahlobo ea litlhoko le liphapang tsa 'maraka

Polyurethane e hlahisoang ke MDI e na le mefuta e mengata ea likopo tse tlase, tse sebelisoang haholo indastering ea kaho, indasteri ea lehae, lisebelisoa tsa ntlo, indasteri ea lipalangoang, indasteri ea lieta, joalo-joalo. Ka hona, tšebeliso ea MDI e amana haholo le tekanyo ea katleho ea moruo oa lefatše lohle.

Ho latela pono ea lefats'e, kakaretso ea tšebeliso ea MDI e entsoeng ka polymerized ka 2021 ke haholo: 49% bakeng sa indasteri ea kaho, 21% bakeng sa lisebelisoa tsa lapeng, 17% bakeng sa likhomaretsi, le 11% bakeng sa likoloi.

Ho ea ka pono ea lehae, karolo ea sebopeho sa tšebeliso ea polymerized MDI ka 2021 ke haholo: 40% bakeng sa thepa e tšoeu, 28% bakeng sa indasteri ea kaho, 16% bakeng sa likhomaretsi, le 7% bakeng sa likoloi.

05 Mokhoa oa tlhōlisano

Lehlakore la phepelo la MDI le hlahisa mokhoa oa tlholisano oa oligopoly. Ho na le bahlahisi ba ka sehloohong ba MDI lefatšeng ka bophara, 'me bahlahisi ba bararo ba kaholimo ka ho fetisisa ke WH Chemical, BASF le Covestro, ka bokhoni bo kopaneng ba likhoebo tse tharo tse nkang karolo e fetang 60% ea kakaretso ea tlhahiso ea lefats'e. Har'a tsona, WH Chemical ke khoebo e etelletseng pele indastering ea MDI ea China le khoebo e kholo ka ho fetisisa lefatšeng ea tlhahiso ea MDI.