Umahluko phakathiUhlobo lwe-TPU yepolyetherkwayeuhlobo lwepolyester
I-TPU inokwahlulwa ibe ziindidi ezimbini: uhlobo lwepolyether kunye nohlobo lwepolyester. Ngokweemfuno ezahlukeneyo zezicelo zemveliso, iintlobo ezahlukeneyo zeTPU kufuneka zikhethwe. Umzekelo, ukuba iimfuno zokuxhathisa i-hydrolysis ziphezulu, uhlobo lwe-polyether ye-TPU lufanelekile kunohlobo lwe-polyester ye-TPU.
Ke namhlanje, makhe sithethe ngomahluko phakathipolyether uhlobo TPUkwayeipolyester uhlobo TPU, nendlela yokwahlula? Oku kulandelayo kuya kucacisa imiba emine: iyantlukwano kwimathiriyeli ekrwada, iyantlukwano yesakhiwo, uthelekiso lwentsebenzo, kunye neendlela zokuchongwa.
1, Umahluko kwimathiriyeli ekrwada
Ndiyakholelwa ukuba abantu abaninzi bayayazi ingqikelelo yee-thermoplastic elastomers, ezinophawu lolwakhiwo lokuqulatha amacandelo athambileyo kunye nobunzima, ngokulandelelana, ukuzisa ukuguquguquka kunye nobungqongqo kwizinto eziphathekayo.
I-TPU inamacandelo amabini athambileyo nalukhuni, kwaye umahluko phakathi kohlobo lwe-polyether yeTPU kunye ne-polyester yohlobo lweTPU ilele kumahluko kumacandelo ekhonkco elithambileyo. Siyawubona umahluko kwimathiriyeli ekrwada.
Polyether uhlobo TPU: 4-4 '- diphenylmethane diisocyanate (MDI), polytetrahydrofuran (PTMEG), 1,4-butanediol (BDO), kunye nomthamo malunga 40% for MDI, 40% for PTMEG, kunye 20% for BDO.
Polyester uhlobo TPU: 4-4 '- diphenylmethane diisocyanate (MDI), 1,4-butanediol (BDO), adipic acid (AA), kunye MDI accounting malunga 40%, AA accounting malunga 35%, kunye neBDO accounting malunga 25%.
Siyabona ukuba izinto eziluhlaza zohlobo lwe-polyether uhlobo lwe-TPU yecandelo lekhonkco elithambileyo yi-polytetrahydrofuran (PTMEG); Izinto ezikrwada zohlobo lwe-polyester uhlobo lwe-TPU i-soft chain segment yi-adipic acid (AA), apho i-adipic acid isabela nge-butanediol ukwenza i-polybutylene adipate ester njengecandelo lekhonkco elithambileyo.
2. Umahluko kwisakhiwo
I-molecular chain ye-TPU ine-(AB) ye-n-type block linear structure, apho i-A inesisindo esiphezulu se-molecular (1000-6000) i-polyester okanye i-polyether, i-B ngokuqhelekileyo i-butanediol, kunye nesakhiwo sekhemikhali phakathi kwamacandelo e-AB chain yi-diisocyanate.
Ngokutsho kwezakhiwo ezahlukeneyo ze-A, i-TPU inokwahlulwa ibe yi-polyester uhlobo, uhlobo lwe-polyether, uhlobo lwe-polycaprolactone, uhlobo lwe-polycarbonate, njl. Iintlobo eziqhelekileyo ziyi-polyether uhlobo lwe-TPU kunye ne-polyester uhlobo lwe-TPU.
Ukusuka kulo mzobo ungasentla, sinokubona ukuba ikhonkco lemolekyuli lilonke lohlobo lwe-polyether ye-TPU kunye nohlobo lwe-polyester ye-TPU zombini zizakhiwo ezinqamlekileyo, kwaye umahluko omkhulu kukuba ingaba icandelo lekhonkco elithambileyo yi-polyether polyol okanye i-polyester polyol.
3. Ukuthelekisa ukusebenza
Iipolyether polyols zipolymers zotywala okanye i-oligomers kunye neebhondi ze-ether kunye namaqela e-hydroxyl ekupheleni kwamaqela kwi-molecular main chain structure. Ngenxa yamandla ayo aphantsi adibeneyo amabhondi e-ether kwisakhiwo sayo kunye nokukhululeka kokujikeleza.
Ngoko ke, i-TPU ye-polyether ine-flexible ephantsi yobushushu obuphantsi, ukuxhathisa kwe-hydrolysis, ukuxhathisa ukungunda, ukuxhathisa kwe-UV, njl.
Amaqela e-ester anamandla aqinileyo okudibanisa i-covalent kwi-polyester polyols anokwenza iibhondi ze-hydrogen kunye namacandelo ekhonkco eliqinileyo, elisebenza njengeendawo zokuwela i-elastic crosslinking. Nangona kunjalo, i-polyester ilungele ukuphuka ngenxa yokuhlaselwa kweeamolekyu zamanzi, kwaye i-asidi eyenziwa yi-hydrolysis inokuthi iqhube ngakumbi i-hydrolysis ye-polyester.
Ke ngoko, i-polyester TPU ineempawu ezibalaseleyo zoomatshini, ukuxhathisa ukunxiba, ukuxhathisa ukukrazuka, ukuxhathisa ukubola kweekhemikhali, ukumelana nobushushu obuphezulu, kunye nokusebenza ngokulula, kodwa ukunganyangeki kwe-hydrolysis.
4. Indlela yokuchonga
Ngokubhekiselele kwi-TPU engcono ukuyisebenzisa, kunokutshiwo kuphela ukuba ukhetho kufuneka lusekelwe kwiimfuno zomzimba zemveliso. Ukufezekisa iipropati ezintle zoomatshini, sebenzisa i-polyester TPU; Ukuba kuqwalaselwa iindleko, ukuxinana, kunye nokusingqongileyo kokusetyenziswa kwemveliso, njengokwenza iimveliso zokonwabisa amanzi, i-polyether TPU ifanelekile ngakumbi.
Nangona kunjalo, xa ukhetha, okanye ukuxuba ngengozi iindidi ezimbini ze-TPU, azinawo umahluko omkhulu kwimbonakalo. Ngoko sifanele sizahlule njani?
Kukho ngokwenene iindlela ezininzi, ezifana nekhemikhali colorimetry, igesi chromatography-mass spectrometry (GCMS), mid infrared spectroscopy, njl. Nangona kunjalo, ezi ndlela zifuna iimfuno zobugcisa eziphezulu kwaye kuthatha ixesha elide.
Ngaba kukho indlela elula nekhawulezayo yokuchonga? Impendulo nguewe, umzekelo, indlela yokuthelekisa ukuxinana.
Le ndlela ifuna kuphela umvavanyi woxinaniso omnye. Ukuthatha imitha yoxinaniso yerabha echanekileyo ephezulu njengomzekelo, amanyathelo okulinganisa ngala:
Beka imveliso kwitafile yokulinganisa, bonisa ubunzima bemveliso, kwaye ucinezele iqhosha elithi Faka ukuze ukhumbule.
Beka imveliso emanzini ukubonisa ixabiso lokuxinana.
Yonke inkqubo yokulinganisa ithatha malunga nemizuzwana emi-5, kwaye ke inokwahlulwa ngokusekelwe kumgaqo wokuba ubuninzi be-polyester uhlobo lwe-TPU luphezulu kunolo lwe-polyether uhlobo lwe-TPU. Uluhlu oluthile loxinaniso lu: i-polyether uhlobo lwe-TPU -1.13-1.18 g / cm3; Polyester TPU -1.18-1.22 g/cm3. Le ndlela inokwahlula ngokukhawuleza phakathi kohlobo lwepolyester yeTPU kunye nohlobo lwepolyether.
Ixesha lokuposa: Jun-03-2024