I-Aliphatic TPU ukusombulula ingxaki yellowing ye ETPU ii soli zezihlangu
ETPU luhlobo TPU izinto yenziwe kukugwebu okukhulu. Ngenxa yokuba ukubonakala kwayo kufana ne-popcorn, i-midsole eyenziwe ngayo ETPU ibizwa ngokuba yipopcorn midsole. Inokomelela okugqwesileyo, uxinezeleko oluphantsi kakhulu uguquko olusisigxina, amava okunxiba kakuhle, kunye nokusingqongileyo nokusebenza kakuhle.
I-Adidas lolona hlobo lwemidlalo lwakuqala ukusebenzisa i-popcorn midsole, kwaye izihlangu zayo ze-Boost zazikhe zathandwa kwimarike. Ngenxa yokusebenza kakuhle kwe ETPU i-midsole, iintlobo ezininzi zezemidlalo ziye zayamkela kwizihlangu zemidlalo.
Nangona kunjalo, ngokuhamba kwexesha, abantu baye bafumanisa ukuba umhlophe ETPU i-midsole iya kujika ibe phuzi emva kokugqoka kwexesha elide, kwaye luhlobo olungenakucocwa, oluchaphazela amava okunxiba kwinqanaba elithile.
Kutheni le nto ETPU i-midsole ijika ibe tyheli emva kokunxiba ixesha elide? Oku kunento yokwenza nesakhiwo seemolekyuli ze TPU.
TPU sisishunqulelo se-thermoplastic polyurethanes, eyi-multiphase block copolymer eyenziwe nge-disocyanate, i-chain extender, kunye ne-polyol. Kuxhomekeke kuhlobo lwe-disocyanate, TPU yahlulwe ikakhulu ibe vumba TPU kunye ne-aliphatic TPU, kwaye umahluko wokusebenza phakathi kwezi zibini zigxininiswe ikakhulu ekuchaseni ukutyheli.
- Ilungu eliqhelekileyo levumba elimnandi TPU: idiphenylmethane diisocyanate (MDI)
- Ilungu eliqhelekileyo le-aliphatic TPU I-hexamethylene diisocyanate (HDI)
Uninzi lwe TPU esetyenziswa kubomi bemihla ngemihla inevumba elimnandi TPU, ethanda ukuba tyheli ngenxa yesakhiwo seringi yebenzene kwi-MDI, njengoko kubonisiwe kulo mfanekiso ungezantsi.
I-MDI inebhuloho ye-methylene phakathi kwamaqela amabini e-phenyl, kwaye le methylene i-oxidized ngokulula kwindawo yokukhanya kwe-ultraviolet, ngaloo ndlela ilahlekelwa yi-hydrogen kwibhulorho ye-methylene, njengoko kuboniswe kumzobo ongezantsi.
Le reaction yamachiza yenza inkqubo edityanisiweyo phakathi kwamakhonkco amabini anevumba elimnandi, ebizwa ngokuba yiquinoid imine. Nangona oku kusabela kwe-oxidation kunempembelelo encinci kwiimpawu ezibonakalayo ze TPU, inokubangela ukutyheli okungajikiyo kwe TPU.
ukusukela ETPU ilungiswa ngogwebu kunye nevumba elimnandi eliqhelekileyo TPU, ukutyheli akunakuphepheka. Indlela yokusombulula le ngxaki? Ukusebenzisa i-aliphatic TPU yindlela elungileyo.
I-Aliphatic TPU, ekwaziwa njenge non-aromatic TPU, njengoko kuboniswe kumzobo ongezantsi, unomgca wesakhiwo se-diisocyanate ester molekyuli. Xa kuthelekiswa nevumba elimnandi TPU, ukuchasana kwayo ne-yellowing kuphuculwe kakhulu.
I-Aliphatic TPU inoluhlu olubanzi lobulukhuni, kwaye njengesiqhelo TPU, Ukuthatha i-40D kunye ne-45D njengemizekelo, emva kogwebu, zihambelana ne-45C kunye ne-50C midsoles, ngokulandelanayo, kunye neempawu ezifana noxinzelelo oluphantsi, u-elasticity olungileyo, ukuchasana okugqwesileyo kwi-yellowing, kunye nokumelana nokukrazula okugqwesileyo.
