Musiyano uripo pakatiRudzi rweTPU polyetheruyerudzi rwepolyester
TPU inogona kukamurwa kuita mhando mbiri: mhando yepolyether nerudzi rwepolyester. Zvichienderana nezvinodiwa zvakasiyana zvekushandiswa kwechigadzirwa, mhando dzakasiyana dzeTPU dzinofanira kusarudzwa. Semuenzaniso, kana zvinodiwa zvekusagona kushandisa hydrolysis zvakanyanya, mhando yepolyether TPU ndiyo yakakodzera kupfuura polyester mhando TPU.
Saka nhasi, ngatitaurei nezvemusiyano uripo pakatipolyether mhando TPUuyepolyester mhando TPU, uye kuti tingazvisiyanisa sei? Zvinotevera zvichatsanangura zvinhu zvina: musiyano wezvinhu zvakagadzirwa, musiyano wechimiro, kuenzanisa mashandiro, uye nzira dzekuzvizivisa.
1, Kusiyana kwezvinhu zvakagadzirwa
Ndinotenda kuti vanhu vazhinji vanoziva pfungwa yethermoplastic elastomers, iyo ine chimiro chekuvaka chekubatanidza zvikamu zvakapfava nezvine zvikamu zvakaoma, zvichiteerana, kuti zvinhu zvigone kuchinjika uye kuomarara.
TPU inewo zvikamu zvecheni dzakapfava nedzakaoma, uye musiyano uripo pakati pemhando yepolyether TPU nemhando yepolyester TPU uripo mumusiyano uripo pakati pezvikamu zvecheni dzakapfava. Tinogona kuona musiyano kubva pazvinhu zvakagadzirwa.
Polyether type TPU: 4-4 '- diphenylmethane diisocyanate (MDI), polytetrahydrofuran (PTMEG), 1,4-butanediol (BDO), ine dose inosvika 40% yeMDI, 40% yePTMEG, uye 20% yeBDO.
TPU yemhando yepolyester: 4-4 '- diphenylmethane diisocyanate (MDI), 1,4-butanediol (BDO), adipic acid (AA), ine MDI inosvika 40%, AA inosvika 35%, uye BDO inosvika 25%.
Tinogona kuona kuti zvinhu zvakagadzirwa zve polyether type TPU soft chain segment ipolytetrahydrofuran (PTMEG); Zvinhu zvakagadzirwa zve polyester type TPU soft chain segments iadipic acid (AA), apo adipic acid inosangana nebutanediol kuumba polybutylene adipate ester sechikamu che soft chain.
2, Musiyano wezvimiro
Cheni yemolekyuru yeTPU ine chimiro che (AB) n-type block linear structure, uko A iri polyester kana polyether ine huremu hwakawanda (1000-6000), B inowanzova butanediol, uye chimiro chemakemikari chiri pakati pezvikamu zveAB chain idiisocyanate.
Zvichienderana nemaumbirwo akasiyana eA, TPU inogona kukamurwa kuita mhando yepolyester, mhando yepolyether, mhando yepolycaprolactone, mhando yepolycarbonate, nezvimwewo. Mhando dzakajairika imhando yepolyether TPU uye mhando yepolyester TPU.
Kubva pamufananidzo uri pamusoro apa, tinogona kuona kuti cheni dzese dzemamorekuru dzemhando yepolyether TPU nemhando yepolyester TPU zvese zviri zvimiro zvakatsetseka, musiyano mukuru uri wekuti chikamu checheni chakapfava ipolyether polyol here kana kuti polyester polyol.
3, Kuenzanisa mashandiro
Polyether polyols ipolymers dzealcohol kana oligomers dzine ether bonds uye hydroxyl groups pamagumo emapoka ari pachimiro che molecular main chain. Nekuda kwesimba rayo shoma re ether bonds muchimiro chayo uye nyore kutenderera.
Saka, polyether TPU ine kuchinjika kwakanaka kwekupisa kwakaderera, kuramba hydrolysis, kuramba chakuvhuvhu, kuramba UV, nezvimwewo. Chigadzirwa ichi chine kunhuhwirira kwakanaka neruoko, asi simba remabvi uye simba rekutyoka hazvina kunaka.
Mapoka eester ane simba rakasimba rekubatanidza macovalent mupolyester polyols anogona kuumba mahydrogen bonds ane zvikamu zvechain chain dzakaoma, zvichishanda senzvimbo dzinobatanidza zvinhu. Zvisinei, polyester inogona kutyoka nekuda kwekupinda kwemamorekuru emvura, uye acid inogadzirwa nehydrolysis inogona kuwedzera catalyse yepolyester.
Saka, polyester TPU ine hunhu hwakanaka hwemakanika, inodzivirira kupera, inodzivirira kubvaruka, inodzivirira ngura yemakemikari, inodzivirira kupisa kwakanyanya, uye iri nyore kugadzira, asi inodzivirira hydrolysis.
4, Nzira yekuzivikanwa
Kana tichitarisa kuti ndeipi TPU iri nani kushandisa, zvinongotaurwa chete kuti sarudzo yacho inofanira kunge yakavakirwa pazvinodiwa zvemuviri zvechigadzirwa. Kuti uwane hunhu hwakanaka hwemakanika, shandisa polyester TPU; Kana tichifunga nezvemutengo, huwandu, uye nzvimbo yekushandisa chigadzirwa, senge kugadzira zvigadzirwa zvekunakidzwa nemvura, polyether TPU ndiyo yakakodzera.
Zvisinei, pakusarudza, kana kusanganisa netsaona mhando mbiri dzeTPU, hadzina musiyano wakakosha pakuonekwa. Saka tinofanira kusiyanisa sei?
Kune nzira dzakawanda, dzakadai se chemical colorimetry, gas chromatography-mass spectrometry (GCMS), mid infrared spectroscopy, nezvimwewo. Zvisinei, nzira idzi dzinoda zvinodiwa zvehunyanzvi uye dzinotora nguva yakareba.
Pane nzira iri nyore uye inokurumidza yekuziva here? Mhinduro ndeyekuti hongu, semuenzaniso, nzira yekuenzanisa huwandu hwevanhu.
Nzira iyi inongoda chinhu chimwe chete chinoedza density. Tichitora semuenzaniso werabha density meter ine kunyatsogadzirwa, matanho ekuyera ndeaya:
Isa chigadzirwa mutafura yekuyera, ratidza huremu hwechigadzirwa, wodzvanya bhatani rekuti Enter kuti urangarire.
Isa chigadzirwa mumvura kuratidza huwandu hwehuremu hwacho.
Maitiro ese ekuyera anotora masekonzi mashanu, uye zvino anogona kusiyaniswa zvichibva papfungwa yekuti huwandu hwepolyester mhando TPU hwakakwira kupfuura hwepolyether mhando TPU. Huwandu hwehuwandu hwezvinhu hwakatarwa ndeihu: polyether mhando TPU -1.13-1.18 g/cm3; Polyester TPU -1.18-1.22 g/cm3. Nzira iyi inogona kusiyanisa nekukurumidza pakati peTPU mhando yepolyester nemhando yepolyester.
Nguva yekutumira: Chikumi-03-2024