Aliphatic TPU warware matsalar yellowing na ETPU takalma takalma
ETPU wani nau'i ne na TPU material kafa ta supercritical kumfa. Domin kamanninsa yana kama da popcorn, tsakiyar da aka yi da shi ETPU ake kira popcorn midsole. Yana da kyakkyawan juriya, ƙarancin gurɓataccen gurɓataccen abu na dindindin, ƙwarewar sawa mai kyau, da abokantakar muhalli da ingantaccen aiki.
Adidas shine farkon alamar wasanni don amfani da popcorn midsole, kuma jerin takalman Boost ɗin sa sun taɓa shahara a kasuwa. Saboda kyakkyawan aiki na ETPU tsaka-tsaki, yawancin alamun wasanni sun karbe shi a cikin takalma na wasanni.
Duk da haka, bayan lokaci, mutane sun gano cewa farar fata ETPU Midsole zai juya launin rawaya bayan lalacewa na dogon lokaci, kuma shine nau'in da ba za a iya tsaftace shi ba, wanda ke shafar kwarewar sawa har zuwa wani lokaci.
Me ya sa ETPU Midsole ya juya rawaya bayan dogon lokaci da lalacewa? Wannan yana da alaƙa da tsarin kwayoyin halitta na TPU.
TPU shi ne taƙaitaccen bayani na thermoplastic polyurethanes, wanda shine multiphase block copolymer wanda ya ƙunshi diisocyanate, sarkar sarkar, da polyol. Dangane da nau'in diisocyanate, TPU yafi karkasu zuwa kamshi TPU da aliphatic TPU, kuma bambancin aiki tsakanin su biyun ya fi mayar da hankali ne a cikin juriya ga rawaya.
- Bangaren gama gari na ƙamshi TPUDiphenylmethane diisocyanate (MDI)
- Bangaren gama gari na aliphatic TPU : hexamethylene diisocyanate (HDI)
Mafi yawa daga cikin TPU amfani da shi a rayuwar yau da kullum yana da ƙanshi TPU, wanda ke da haɗari ga rawaya saboda tsarin zoben benzene akan MDI, kamar yadda aka nuna a cikin hoton da ke ƙasa.
MDI tana da gadar methylene tsakanin ƙungiyoyin phenyl guda biyu, kuma wannan methylene yana da sauƙin oxidized a cikin yanayin hasken ultraviolet, ta haka ya rasa hydrogen akan gadar methylene, kamar yadda aka nuna a hoton da ke ƙasa.
Wannan sinadari yana haifar da tsarin haɗin gwiwa tsakanin zoben kamshi guda biyu, wanda ake kira quinoid imine. Ko da yake wannan hadawan abu da iskar shaka dauki yana da kadan tasiri a kan jiki Properties na TPU, Yana iya haifar da irreversible yellowing na TPU.
tun ETPU an shirya shi ta hanyar kumfa tare da ƙanshi na kowa TPU, rawaya ba makawa. Yadda za a magance wannan matsala? Yin amfani da aliphatic TPU hanya ce mai kyau.
Aliphatic TPU, wanda kuma aka sani da marasa kamshi TPU, kamar yadda aka nuna a cikin hoton da ke ƙasa, yana da tsarin layi na diisocyanate ester molecule. Idan aka kwatanta da kamshi TPU, juriya ga launin rawaya yana inganta sosai.
Aliphatic TPU yana da fadi da kewayon taurin, kuma kamar talakawa TPU, Ɗaukar 40D da 45D a matsayin misalai, bayan kumfa, sun dace da 45C da 50C midsoles, bi da bi, tare da halaye irin su ƙananan yawa, mai kyau elasticity, kyakkyawan juriya ga rawaya, da kyakkyawan juriya na hawaye.
