Kusiyana pakatiTPU polyether mtundundipolyester mtundu
TPU akhoza kugawidwa mu mitundu iwiri: polyether mtundu ndi polyester mtundu. Malinga ndi zofunikira zosiyanasiyana zamagwiritsidwe ntchito, mitundu yosiyanasiyana ya TPU iyenera kusankhidwa. Mwachitsanzo, ngati zofunikira za kukana kwa hydrolysis ndizokwera kwambiri, mtundu wa polyether TPU ndi woyenera kuposa mtundu wa polyester TPU.
Choncho lero, tiyeni tikambirane kusiyana pakatipolyether mtundu TPUndipolyester mtundu TPU, ndi momwe tingawasiyanitsire? Zotsatirazi zidzalongosola mbali zinayi: kusiyana kwa zipangizo, kusiyana kwa kamangidwe, kufananitsa machitidwe, ndi njira zozindikiritsira.
1, Kusiyana kwa zipangizo
Ndikukhulupirira kuti anthu ambiri amadziwa lingaliro la ma thermoplastic elastomers, omwe ali ndi mawonekedwe omwe amakhala ndi zigawo zofewa komanso zolimba, motsatana, kuti abweretse kusinthasintha komanso kusasunthika kwa zinthuzo.
TPU ilinso ndi zigawo zonse zofewa komanso zolimba, ndipo kusiyana pakati pa polyether mtundu wa TPU ndi polyester mtundu wa TPU kuli pakusiyana kwa zigawo zofewa. Titha kuwona kusiyana ndi zopangira.
Polyether mtundu TPU: 4-4 '- diphenylmethane diisocyanate (MDI), polytetrahydrofuran (PTMEG), 1,4-butanediol (BDO), ndi mlingo pafupifupi 40% kwa MDI, 40% kwa PTMEG, ndi 20% kwa BDO.
Polyester mtundu TPU: 4-4 '- diphenylmethane diisocyanate (MDI), 1,4-butanediol (BDO), adipic acid (AA), ndi MDI accounting pafupifupi 40%, AA accounting pafupifupi 35%, ndi BDO accounting pafupifupi 25%.
Titha kuwona kuti zopangira za polyether mtundu wa TPU gawo lofewa la unyolo ndi polytetrahydrofuran (PTMEG); Zopangira zigawo za polyester mtundu wa TPU zofewa ndi adipic acid (AA), pomwe adipic acid amakumana ndi butanediol kupanga polybutylene adipate ester ngati gawo lofewa.
2. Kusiyana kwamapangidwe
Ma molekyulu a TPU ali ndi (AB) n-mtundu wa block linear, pomwe A ndi polyester yolemera kwambiri (1000-6000) kapena polyether, B nthawi zambiri imakhala butanediol, ndipo kapangidwe kake kake pakati pa zigawo za AB ndi diisocyanate.
Malinga ndi mapangidwe osiyanasiyana a A, TPU ikhoza kugawidwa mu mtundu wa poliyesitala, mtundu wa polyether, mtundu wa polycaprolactone, mtundu wa polycarbonate, etc. Mitundu yowonjezereka ndi polyether mtundu wa TPU ndi polyester mtundu wa TPU.
Kuchokera pa chithunzi pamwambapa, titha kuwona kuti maunyolo amtundu wa polyether mtundu wa TPU ndi polyester mtundu wa TPU onse ndi mizere mizere, kusiyana kwakukulu ndikuti ngati gawo lofewa ndi polyether polyol kapena polyester polyol.
3. Kufananiza kwa magwiridwe antchito
Ma polyether polyols ndi ma polima a mowa kapena ma oligomer okhala ndi ma ether bond ndi magulu a hydroxyl kumapeto kwamagulu pama cell chain chain. Chifukwa cha mphamvu yake yochepa yogwirizana ya zomangira za ether mu kapangidwe kake ndi kusinthasintha kwa kasinthasintha.
Choncho, polyether TPU ali kwambiri otsika kutentha kusinthasintha, kukana hydrolysis, kukana nkhungu, UV kukana, etc. mankhwala ali ndi dzanja amamva bwino, koma peel mphamvu ndi fracture mphamvu ndi osauka.
Magulu a ester okhala ndi mphamvu zomangirira zolimba mu polyester polyols amatha kupanga zomangira za haidrojeni zokhala ndi magawo olimba a unyolo, omwe amakhala ngati malo olumikizirana. Komabe, poliyesitala sachedwa kusweka chifukwa cha kuukira kwa mamolekyu amadzi, ndipo asidi opangidwa ndi hydrolysis amatha kuyambitsa hydrolysis ya poliyesitala.
Chifukwa chake, polyester TPU ili ndi zida zabwino zamakina, kukana kuvala, kukana misozi, kukana kwa dzimbiri, kukana kutentha kwambiri, komanso kukonza kosavuta, koma kukana kwa hydrolysis.
4. Njira yodziwika
Ponena za TPU yomwe ili bwino kugwiritsa ntchito, tingangonena kuti kusankha kuyenera kutengera zofunikira za thupi la mankhwala. Kuti mukwaniritse bwino makina, gwiritsani ntchito polyester TPU; Ngati mukuganizira za mtengo, kachulukidwe, ndi malo ogwiritsira ntchito zinthu, monga kupanga zinthu zosangalatsa zamadzi, polyether TPU ndiyoyenera kwambiri.
Komabe, posankha, kapena kusakaniza mwangozi mitundu iwiri ya TPU, alibe kusiyana kwakukulu pamawonekedwe. Ndiye tiyenera kuwasiyanitsa bwanji?
Pali njira zambiri, monga mankhwala colorimetry, gas chromatography-mass spectrometry (GCMS), mid infuraredi spectroscopy, etc. Komabe, njira zimenezi amafuna mkulu luso luso ndipo zimatenga nthawi yaitali.
Kodi pali njira yosavuta komanso yofulumira yozindikiritsa? Yankho ndi inde, mwachitsanzo, kachulukidwe kuyerekeza njira.
Njirayi imangofunika kuyesa kachulukidwe kamodzi. Kutengera mita ya kachulukidwe ya rabara yolondola kwambiri monga chitsanzo, miyeso ndi:
Ikani malondawo patebulo loyezera, onetsani kulemera kwa chinthucho, ndikudina batani la Enter kuti mukumbukire.
Ikani mankhwalawa m'madzi kuti muwonetse kuchuluka kwa kachulukidwe.
Njira yonse yoyezera imatenga pafupifupi masekondi a 5, kenako imatha kusiyanitsa potengera mfundo yakuti kachulukidwe ka polyester mtundu wa TPU ndi wapamwamba kuposa wa polyether mtundu wa TPU. Mitundu yeniyeni ya kachulukidwe ndi: polyether mtundu TPU -1.13-1.18 g/cm3; Polyester TPU -1.18-1.22 g/cm3. Njirayi imatha kusiyanitsa mwachangu pakati pa mtundu wa polyester wa TPU ndi mtundu wa polyether.
Nthawi yotumiza: Jun-03-2024