Musiyano uripoTPU polyether mhandouyepolyester mhando
TPU inogona kukamurwa kuva mhando mbiri: polyether mhando uye polyester mhando. Zvinoenderana nezvinodiwa zvakasiyana zvekushandisa kwechigadzirwa, mhando dzakasiyana dzeTPU dzinoda kusarudzwa. Semuyenzaniso, kana zvinodikanwa zvekuramba hydrolysis zvakati wedzerei, polyether type TPU inonyanya kukodzera pane polyester type TPU.
Saka nhasi, ngatitaure pamusoro pekusiyana pakatipolyether mhando TPUuyepolyester mhando TPU, uye sei kuasiyanisa? Zvinotevera zvichatsanangudza pamusoro pezvinhu zvina: misiyano yezvigadzirwa, misiyano yezvimiro, kuenzanisa kwekuita, uye nzira dzekuziva.
1, Misiyano mune mbishi zvinhu
Ini ndinotenda kuti vanhu vazhinji vanoziva iyo thermoplastic elastomers, iyo ine chimiro chechimiro chine ese akapfava uye akaoma zvikamu, zvichiteerana, kuunza kuchinjika uye kusimba kune izvo zvinhu.
TPU zvakare ine ese akapfava uye akaoma cheni zvikamu, uye mutsauko uripo pakati pepolyether mhando TPU uye polyester mhando TPU uri mumusiyano weakapfava cheni zvikamu. Isu tinogona kuona mutsauko kubva kune mbishi zvinhu.
Polyether type TPU: 4-4 '- diphenylmethane diisocyanate (MDI), polytetrahydrofuran (PTMEG), 1,4-butanediol (BDO), ine dosage inosvika 40% yeMDI, 40% yePTMEG, uye 20% yeBDO.
Polyester type TPU: 4-4 '- diphenylmethane diisocyanate (MDI), 1,4-butanediol (BDO), adipic acid (AA), ine MDI accounting inosvika 40%, AA accounting inosvika makumi matatu neshanu muzana, uye BDO accounting yeanenge 25%.
Isu tinogona kuona kuti iyo mbishi yemhando yepolyether mhando TPU yakapfava cheni segment ndeye polytetrahydrofuran (PTMEG); Iyo mbishi yepolyester mhando TPU yakapfava cheni zvikamu ndeye adipic acid (AA), uko adipic acid inopindirana nebutanediol kugadzira polybutylene adipate ester sechikamu chakapfava cheni.
2. Kusiyana kwemaitiro
Iyo molecular cheni yeTPU ine (AB) n-mhando block linear chimiro, uko A iri yakakwira molecular huremu (1000-6000) polyester kana polyether, B inowanzoita butanediol, uye chimiro chemakemikari pakati peAB cheni zvikamu diisocyanate.
Zvinoenderana nemhando dzakasiyana dzeA, TPU inogona kukamurwa kuita polyester mhando, polyether mhando, polycaprolactone mhando, polycarbonate mhando, etc. Iyo inonyanya kuzivikanwa mhando ndeye polyether mhando TPU uye polyester mhando TPU.
Kubva pamufananidzo uri pamusoro, isu tinogona kuona kuti ese mamorekuru cheni dze polyether mhando TPU uye polyester mhando TPU ese ari maviri mutsara zvimiro, nemusiyano mukuru uri wekuti chikamu checheni yakapfava ipolyether polyol kana polyester polyol.
3, Kuenzanisa kwekuita
Polyether polyols doro polymers kana oligomers ane ether bond uye hydroxyl mapoka kumagumo mapoka pane molecular main cheni chimiro. Pamusana pesimba rayo rakaderera rekubatana kwe ether zvisungo mukugadzirisa kwayo uye nyore kwekutenderera.
Naizvozvo, polyether TPU ine yakanakisa kudzika-tembiricha kuchinjika, hydrolysis kuramba, mold kuramba, UV kuramba, etc. Chigadzirwa chine ruoko rwakanaka kunzwa, asi kusimba kweganda uye kutsemuka kwesimba kunenge kwakashata.
Iwo ester mapoka ane yakasimba covalent bonding simba mupolyester polyols anogona kuumba hydrogen zvisungo neakaomarara cheni zvikamu, anoshanda se elastic crosslinking point. Nekudaro, polyester inotapukira nekuda kwekupinda kwemamorekuru emvura, uye iyo asidhi inogadzirwa nehydrolysis inogona kuwedzera kukonzeresa hydrolysis yepolyester.
Naizvozvo, polyester TPU ine yakanakisa mechanicha zvivakwa, kupfeka kuramba, kubvarura kuramba, kemikari corrosion kuramba, yakakwirira tembiricha kuramba, uye nyore kugadzirisa, asi kushomeka kwehydrolysis kuramba.
4, Chiziviso nzira
Kana iri iyo TPU iri nani kushandisa, inogona kungotaurwa kuti kusarudzwa kunofanirwa kuenderana nezvinodiwa zvemuviri zvechigadzirwa. Kuti uwane zvinhu zvakanaka zvemagetsi, shandisa polyester TPU; Kana uchifunga nezve mutengo, density, uye nharaunda yekushandiswa kwechigadzirwa, senge kugadzira zvigadzirwa zvevaraidzo zvemvura, polyether TPU inonyanya kukodzera.
Nekudaro, pakusarudza, kana netsaona kusanganisa mhando mbiri dzeTPU, ivo havana mutsauko wakakura mukutaridzika. Saka tinofanira kuasiyanisa sei?
Iko chaizvoizvo kune nzira dzakawanda, dzakadai semakemikari colorimetry, gasi chromatography-mass spectrometry (GCMS), mid infrared spectroscopy, etc. Zvisinei, nzira idzi dzinoda hukuru hwehutano hunodiwa uye dzinotora nguva yakareba.
Pane nzira iri nyore uye inokurumidza yekuzivisa here? Mhinduro ndeyekuti hongu, semuenzaniso, density kuenzanisa nzira.
Iyi nzira inongoda imwe density tester. Kutora yakakwirira-chaiyo rubber density meter semuenzaniso, matanho ekuyera ndeaya:
Isa chigadzirwa mutafura yekuyeresa, ratidza huremu hwechigadzirwa, uye dzvanya Enter kiyi kuti uyeuke.
Isa chigadzirwa mumvura kuratidza kukosha kwe density.
Iyo yese yekuyera maitiro inotora masekonzi mashanu, uyezve inogona kusiyaniswa zvichibva pamusimboti wekuti density yepolyester mhando TPU yakakwirira kupfuura yepolyether mhando TPU. Iyo chaiyo density range ndeye: polyether mhando TPU -1.13-1.18 g/cm3; Polyester TPU -1.18-1.22 g/cm3. Iyi nzira inogona kukurumidza kusiyanisa pakati peTPU polyester mhando uye polyether mhando.
Nguva yekutumira: Jun-03-2024