Umahluko phakathi kohlobo lwe-TPU polyether kunye nohlobo lwe-polyester

Umahluko phakathiUhlobo lwe-TPU polyetherkwayeuhlobo lwe-polyester

I-TPU ingahlulwahlulwa ibe ziintlobo ezimbini: uhlobo lwe-polyether kunye nohlobo lwe-polyester. Ngokweemfuno ezahlukeneyo zezicelo zemveliso, kufuneka kukhethwe iintlobo ezahlukeneyo ze-TPU. Umzekelo, ukuba iimfuno zokuxhathisa i-hydrolysis ziphezulu, uhlobo lwe-polyether TPU lufanelekile ngakumbi kune-polyester TPU.

Ngoko ke namhlanje, masithethe ngomahluko phakathiuhlobo lwe-polyether TPUkwayeuhlobo lwe-polyester TPU, kwaye ungazihlula njani? Oku kulandelayo kuza kuchaza iinkalo ezine: umahluko kwizinto ezikrwada, umahluko kwisakhiwo, uthelekiso lokusebenza, kunye neendlela zokuchonga.

1, Umahluko kwizinto ezikrwada

Ndikholelwa ukuba abantu abaninzi bayayazi ingcamango yee-elastomers ze-thermoplastic, ezinophawu lwesakhiwo oluqulathe zombini iindawo ezithambileyo neziqinileyo, ngokwahlukeneyo, ukuze zivelise ukuguquguquka nokuqina kwezinto.

I-TPU ikwanazo zombini iinxalenye zetyathanga ezithambileyo neziqinileyo, kwaye umahluko phakathi kohlobo lwe-polyether TPU kunye nohlobo lwe-polyester TPU uxhomekeke kumahluko kwiinxalenye zetyathanga ezithambileyo. Sinokubona umahluko kwizinto eziluhlaza.

Uhlobo lwePolyether TPU: 4-4 '- diphenylmethane diisocyanate (MDI), polytetrahydrofuran (PTMEG), 1,4-butanediol (BDO), kunye nomthamo omalunga ne-40% ye-MDI, 40% ye-PTMEG, kunye ne-20% ye-BDO.

Uhlobo lwePolyester TPU: 4-4 '- diphenylmethane diisocyanate (MDI), 1,4-butanediol (BDO), adipic acid (AA), apho iMDI imalunga ne-40%, iAA imalunga ne-35%, kwaye iBDO imalunga ne-25%.

Sinokubona ukuba izinto eziluhlaza zecandelo le-TPU soft chain segment ye-polyether yi-polytetrahydrofuran (PTMEG); Izinto eziluhlaza zecandelo le-TPU soft chain segments ye-polyester yi-adipic acid (AA), apho i-adipic acid isabela khona ne-butanediol ukuze yenze i-polybutylene adipate ester njengecandelo le-soft chain.

2, umahluko kwisakhiwo

I-molecular chain ye-TPU inesakhiwo esithe ngqo se-(AB) n-type block, apho i-A ilubunzima obuphezulu be-molecular (1000-6000) polyester okanye i-polyether, i-B ngokubanzi yi-butanediol, kwaye isakhiwo seekhemikhali phakathi kwamacandelo e-AB chain yi-diisocyanate.

Ngokwezakhiwo ezahlukeneyo ze-A, i-TPU inokwahlulwahlulwa ibe luhlobo lwe-polyester, uhlobo lwe-polyether, uhlobo lwe-polycaprolactone, uhlobo lwe-polycarbonate, njl. Iintlobo ezixhaphakileyo luhlobo lwe-polyether TPU kunye nohlobo lwe-polyester TPU.

Ukususela kumfanekiso ongasentla, singabona ukuba imixokelelwane iyonke yemolekyuli yohlobo lwe-polyether TPU kunye nohlobo lwe-polyester TPU zombini zizakhiwo ezithe ngqo, umahluko ophambili kukuba ingaba icandelo lemixokelelwane ethambileyo yi-polyether polyol okanye yi-polyester polyol.

3, Uthelekiso loMsebenzi

Iipolyol zePolyether ziipolymers okanye iioligomers ezineebhondi ze-ether kunye namaqela e-hydroxyl kumaqela okugqibela kwisakhiwo se-molecular main chain. Ngenxa yamandla ayo aphantsi okubambisana kweebhondi ze-ether kwisakhiwo sayo kunye nokulula kokujikeleza.

Ke ngoko, i-polyether TPU inokuguquguquka okugqwesileyo kobushushu obuphantsi, ukumelana ne-hydrolysis, ukumelana nokungunda, ukumelana ne-UV, njl. Le mveliso inemvakalelo entle yesandla, kodwa amandla okuxobuka kunye namandla okuqhekeka aphantsi kakhulu.

Amaqela eester anamandla okubopha i-covalent kwi-polyester polyols anokwenza ii-hydrogen bonds ezinee-hard chain segments, ezisebenza njengeendawo zokudibanisa i-elastic. Nangona kunjalo, i-polyester isengozini yokuqhekeka ngenxa yokuhlasela kwee-molecule zamanzi, kwaye i-asidi eveliswa yi-hydrolysis inokubangela i-hydrolysis ye-polyester.

Ngoko ke, i-polyester TPU ineempawu ezintle kakhulu zoomatshini, ukumelana nokuguguleka, ukumelana nokukrala kweekhemikhali, ukumelana nobushushu obuphezulu, kunye nokucutshungulwa okulula, kodwa ukumelana ne-hydrolysis embi.

4, indlela yokuchonga

Ngokuphathelele ukuba yeyiphi iTPU engcono ukuyisebenzisa, kunokuthiwa kuphela ukuba ukhetho kufuneka lusekelwe kwiimfuno zomzimba zemveliso. Ukuze ufumane iipropati ezilungileyo zoomatshini, sebenzisa i-polyester TPU; Ukuba ucinga ngexabiso, ubuninzi, kunye nendawo yokusetyenziswa kwemveliso, njengokwenza iimveliso zokuzonwabisa zamanzi, i-polyether TPU ifanelekile ngakumbi.

Nangona kunjalo, xa ukhetha, okanye udibanisa ngempazamo iintlobo ezimbini zeTPU, azinawo umahluko omkhulu kwinkangeleko. Ngoko ke singazahlula njani?

Kukho iindlela ezininzi, ezifana ne-chemical colorimetry, i-gas chromatography-mass spectrometry (GCMS), i-mid infrared spectroscopy, njl. Nangona kunjalo, ezi ndlela zifuna iimfuno zobugcisa eziphezulu kwaye zithatha ixesha elide.

Ngaba ikho indlela yokuchonga elula nekhawulezayo? Impendulo ngu-ewe, umzekelo, indlela yokuthelekisa uxinano.

Le ndlela ifuna umvavanyi omnye kuphela woxinano. Umzekelo, xa kuthathwa imitha yoxinano ngerabha echanekileyo, amanyathelo okulinganisa ngala:

Beka imveliso kwitheyibhile yokulinganisa, bonisa ubunzima bemveliso, uze ucinezele iqhosha elithi Enter ukuze ukhumbule.
Beka imveliso emanzini ukuze ubonise ixabiso loxinano.
Yonke inkqubo yokulinganisa ithatha malunga nemizuzwana emi-5, ize emva koko ikwazi ukwahlulwa ngokusekelwe kumgaqo wokuba uxinano lohlobo lwe-polyester TPU luphezulu kunolo lohlobo lwe-polyether TPU. Uluhlu oluthile loxinano lulandelayo: uhlobo lwe-polyester TPU -1.13-1.18 g/cm3; i-Polyester TPU -1.18-1.22 g/cm3. Le ndlela inokwahlula ngokukhawuleza phakathi kohlobo lwe-TPU polyester kunye nohlobo lwe-polyether.