1. Kakaretso ea TPU
Polyurethane ea Thermoplastic (TPU)ke elastomer ea copolymer ea linear block e sebetsang hantle e kopanyang litšobotsi tse phahameng tsa rabara le polasetiki ea boenjiniere. E na le ho tenyetseha ho hoholo, matla a mechini, ho hanyetsa ho tsofala, le ho sebetsa ha thermoplastic habonolo. Ho fapana le rabara ea setso e hokahaneng, TPU e na le meaho e ka fetoloang ea 'mele e hokahanang e entsoeng ka litlamo tsa haedrojene, e nolofalletsang ho futhumatsa khafetsa, ho qhibiliha le ho bopa ntle le ho senyeha ho hoholo ha ts'ebetso. Thepa ena e ikhethang e etsa hore TPU e be e 'ngoe ea thepa e feto-fetohang ka ho fetisisa ea thermoplastic elastomer (TPE) e sebelisoang haholo tlhahisong ea indasteri, thepa ea bareki, likoloi, bongaka le masimo a mang.
Tshebetso ya dihlahiswa tsa TPU tse fedisitsweng e itshetlehile haholo-holo ka sebopeho sa yona sa thepa e tala, karolelano ya ho lekanya le tshebetso ya polymerization. Disebediswa tsohle tsa TPU tsa kgwebo di polymerized ho tswa ho disebediswa tse tharo tsa mantlha tse tala: di-polyol tsa ketane e telele, diisocyanate, le di-extender tsa ketane e kgutshwane.
2. Likarolo tsa Bohlokoa tsa Thepa e Tala ea TPU
TPU ke copolymer ea li-block tse arohaneng e entsoeng ka likarolo tse bonolo tse fapanyetsanang le likarolo tse thata. Likarolo tse bonolo li fa TPU ho tenyetseha, ho tiea le ho hanyetsa mocheso o tlase, ha likarolo tse thata li fana ka ho tiea, matla a ho tsitlella, ho hanyetsa ho tsofala le botsitso ba mocheso. Lisebelisoa tse tharo tsa bohlokoa tse tala li tsamaisana le ho thehoa ha meaho ena e 'meli ea likarolo ka ho latellana.
2.1 Li-Polyol tsa ketane e telele (Lisebelisoa tse Tala tsa Karolo e Bonolo)
Li-polyol tsa ketane e telele (li-diols tsa ketane e telele) ke thepa ea mantlha ea ho etsa likarolo tse bonolo tsa TPU, ka boima ba limolek'hule bo tlohang ho 1000 ho isa ho 3000 g/mol. Ke tsona mohloli o moholo oa ho tenyetseha le ho tenyetseha ha TPU. Ho ea ka sebopeho sa lik'hemik'hale, li-polyol li arotsoe haholo ka lihlopha tse peli, tse khethollang karohano ea motheo le liphapang tsa ts'ebetso ea mantlha ea TPU.
PoliesterPolyol: E entsoe ka polycondensation reaction ea dicarboxylic acids le diols. TPU e hlahisoang ka polyols ea polyester e na le matla a ikhethang a mechini, khanyetso ea ho khohlela, khanyetso ea oli le khanyetso ea botsofali. E na le matla a holimo a ho thaepa le khanyetso ea ho taboha, 'me e loketse ho etsa likarolo tse tsofalang haholo, litiiso tsa indasteri, thepa ea lieta le lihlahisoa tsa sekhomaretsi. Leha ho le joalo, TPU e thehiloeng ho polyester e na le khanyetso e fokolang ea hydrolysis le ho tiea ha mocheso o tlase, 'me e na le tšekamelo ea hydrolysis le ho senyeha libakeng tse mongobo tsa nako e telele.
PolietherPolyol: E entsoe ka polymerization e tsoang ho polymerization e bulang selikalikoe ea li-monomers tsa ether. TPU e thehiloeng ho polyether e na le khanyetso e ntle ea hydrolysis, ho tenyetseha ha mocheso o tlase, khanyetso ea metsi le khanyetso ea likokoana-hloko. E lula e tenyetseha ebile e tsitsitse libakeng tse mocheso o tlase haholo, 'me ha ho bonolo ho e senya ke mongobo le libaktheria. E sebelisoa haholo lifiliming tse sa keneleng metsi, lisebelisoa tsa ka tlas'a metsi, li-sheath tsa terata le tsa cable, le likarolo tse hanelang mocheso o tlase. Mefokolo ea eona e ho khanyetso e tlase hanyane ea ho robeha le khanyetso ea oli ha e bapisoa le polyester TPU.
2.2 Diisocyanate (Thepa e Tala ea Karolo e Thata)
Diisocyanate ke di-monomer tse arabelang tse nang le dihlopha tse sebetsang tsa NCO, tse arabelang ka dihlopha tsa hydroxyl tsa di-polyol le di-extender tsa ketane ho theha dibopeho tse thata tsa dikarolo tse thata, mme ke senotlolo sa ho fumana ho thatafala, ho tiea le botsitso ba mocheso ba TPU. Diisocyanate e sebediswang haholo tlhahisong ya TPU ya diindasteri ke MDI (Methylene Diphenyl Diisocyanate), e nang le thepa e tsitsitseng ya dikhemikhale, tshebetso e phahameng ya karabelo le ho feto-fetoha ho tlase, mme e loketse dihlahiswa tse ngata tsa TPU tse akaretsang le tse sebetsang hantle.
Ho phaella moo, diisocyanate tsa maemo a ikgethang tse kang HDI le IPDI di sebediswa ho kopanya TPU ya aliphatic. TPU e jwalo ha e na sebopeho sa lesale la benzene ka hara ketane ya dimolek'hule, e bontsha kganyetso e ntle ya ho ba mosehla, botsitso ba lesedi le kganyetso ya boemo ba lehodimo, mme e sebediswa ka ho kgetheha bakeng sa dihlahiswa tsa kantle, dikarolo tse bonaletsang tsa mekhabiso, dikarolo tsa kantle tsa dikoloi le dihlahiswa tse nang le mmala o motle.
2.3 Dikatoloso tsa Ketane tse Khutshwane (Thepa e Thusang ya Karolo e Thata)
Di-extender tsa ketane ke di-diol tse kgutshwane tsa ketane tse nang le boima bo tlase ba dimolek'hule (haholo-holo 1,4-Butanediol, BDO), tse arabelang ka di-diisocyanate tse ngata ho theha dibaka tse teteaneng tsa dikarolo tse thata. Di bapala karolo ya bohlokwa ho fetoleng boima, modulus le thepa ya mechini ya TPU. Ka ho fetola karolelano ya ho eketsa di-extender tsa ketane, bahlahisi ba ka laola ka nepo mefuta ya thata ya TPU ho tloha ho 60 Shore A (boemo ba rabara e bonolo) ho ya ho 85 Shore D (boemo ba polasetiki e thata).
Sebopeho sa karolo e thata se bopilweng ke di-extender tsa ketane le diisocyanate se bopa dintlha tsa ho hokahanya tsa mmele ka ho kopanya haeterojene pakeng tsa diketane tsa dimolek'hule, e leng se netefatsang hore TPU e na le ho tenyetseha ho kang rabara mochesong wa kamore, mme e ka qhibilihiswa le ho phalla mochesong o phahameng bakeng sa ho bopa ka ente, ho ntsha, ho bopa ka ho phatloha le ts'ebetso e nngwe ya thermoplastic.
3. Tlhophiso ea TPU e Thehiloeng ho Foromo ea Lisebelisoa tse Tala
Ho ea ka mofuta oa thepa e tala ea polyol, thepa e tala ea TPU ea indasteri e arotsoe ka lihlopha tse tharo, e akaretsang maemo a mangata a ts'ebeliso:
TPU ea poliester: E laoloa ke thepa e tala ea polyester polyol, e nang le matla a phahameng, khanyetso ea ho tsofala le k'hemik'hale, e loketse likarolo tse sa tsofaleng tsa indasteri, lithapo tsa lieta, lifilimi tsa letlalo le thepa ea ho kopanya.
Polyether TPU: E ipapisitse le thepa e tala ea polyol ea polyether, e nang le khanyetso e phahameng ea hydrolysis le ts'ebetso e tlase ea mocheso, e sebelisoang haholo lifiliming tse sa keneng metsi, lisebelisoa tsa bongaka, thepa ea cable le likarolo tsa lisebelisoa tse hanelang serame.
TPU e Fetotsoeng e Ikhethang: Ho latela thepa e meraro ea mantlha e tala, eketsa lintho tse ling tse sebetsang (li-retardant tsa malakabe, li-anti-ultraviolet agents, li-tougheners, jj.) kapa u sebelise mekhoa ea polyol e kopaneng ho hlahisa thepa ea TPU e thibelang malakabe, e hanelang boemo ba leholimo, e bonaletsang, e bolaeang likokoana-hloko le tse ling tse khethehileng bakeng sa maemo a ikhethileng a maemo a holimo.
4. Matlotlo a Bohlokoa a Hlalosoang ke Lisebelisoa tse Tala
Karolelano e tsamaellanang le mofuta oa thepa e tala ea TPU li khetholla ka kotloloho ts'ebetso ea ho qetela ea thepa, li bontša litšobotsi tse hlakileng tse ka fetoloang:
- Ho Fetola Bothata ba ho Thatafala: Ho fetola karolo ea likarolo tse thata (diisocyanate + ketane extender) ho ka etsa hore ho be le phetoho e tsoelang pele ea thatafalo ea TPU, e koahelang elastomer e bonolo ho ea ho polasetiki ea boenjiniere e thata.
- Matlotlo a Mekaniki: Thepa e tala ea polyester e tlisa matla a ho tsitlella le ho hanyetsa ho tsofala; thepa e tala ea polyether e ntlafatsa ho tiea le ho hanyetsa mokhathala.
- Ho Ikamahanya le Tikoloho: Polyether TPU e hanela hydrolysis le mocheso o tlase; thepa e tala ea aliphatic diisocyanate e ntlafatsa ho hanyetsa boemo ba leholimo le ts'ebetso ea ho thibela bosehla.
- Tshebetso ea Ts'ebetso: Kabo e utloahalang ea boima ba limolek'hule ea thepa e tala e netefatsa ho qhibiliha hantle ha metsi, e nolofalletsang TPU ho ikamahanya le mahlale a fapaneng a ts'ebetso ea thermoplastic le ho tšehetsa ts'ebetso e nchafalitsoeng.
5. Litšobotsi tsa Tlhahiso le Tsamaiso
Lisebelisoa tse tala tsa TPU li hlahisoa ka ho sebelisa polymerization ea bongata kapa polymerization ea tharollo. Kamora ho lekanya ka nepo li-polyol, diisocyanate le li-extender tsa ketane, thepa e feta polymerization ea mocheso o phahameng, karabelo ea katoloso ea ketane, ho pholisa le ho pelletisa ho etsa lisebelisoa tse tala tsa TPU tse tšoanang. Ts'ebetso eohle ea tlhahiso ha e na li-plasticizer, 'me thepa e tala e felileng ha e na chefo ebile e mosa tikolohong, e fihlela litekanyetso tsa lefats'e tsa ts'ireletso ea tikoloho joalo ka RoHS le REACH.
Jwalo ka thepa ya thermoplastic, dipellet tsa thepa e tala tsa TPU di ka sebetswa ka ho toba ka disebediswa tsa polasetiki tse tlwaelehileng. Disebediswa tse setseng le dihlahiswa tse lahlilweng nakong ya tshebetso di ka sebediswa hape, tsa qhibilihiswa le ho sebediswa hape, ka tahlehelo e tlase ya thepa le sekgahla se phahameng sa tshebediso ya mehlodi, e leng se dumellanang le mokgwa wa ntshetsopele wa tlhahiso e tala.
6. Likopo tse ka Sehloohong tsa Lisebelisoa tse Tala tsa TPU
Ka lebaka la ts'ebetso e ka fetoloang ea liforomo tsa thepa e tala, thepa e tala ea TPU e sebelisoa haholo liindastering tse ngata:
- Indasteri ea Likoloi: Likarolo tsa kahare tsa likoloi, likarolo tse monyang litšisinyeho, liphaephe tse sa keneleng metsi, li-sheath tsa terata le tsa cable, tse itšetlehileng ka ho tiea ho hoholo le ho hanyetsa boemo ba leholimo ba thepa e tala ea TPU e fetotsoeng.
- Thepa ea Bareki le Lieta: Lithapo tsa lieta tsa lipapali, mabokose a sireletsang fono, lisebelisoa tsa mekotla, mabanta a tenyetsehang, a sebelisang ho tenyetseha ho hoholo le ho hanyetsa ho tsofala ha polyester TPU.
- Litlhoko tsa Bongaka le tsa Letsatsi le Letsatsi: Li-catheter tsa bongaka, lisebelisoa tsa tšireletso, lisebelisoa tsa boemo ba lijo, ho amohela thepa e tala ea polyether TPU e sireletsehileng lijong le e hanelang hydrolysis.
- Tlhahiso ea Liindasteri: Li-gasket tse sa tsofaleng, mabanta a tsamaisang thepa, liphaephe tsa hydraulic, lifilimi tsa sekhomaretsi, tse sebelisang ka botlalo matla a phahameng le botsitso ba lik'hemik'hale ba thepa e tala ea TPU.
- Indasteri e Ncha ea Matla le ea Elektroniki: Lifilimi tse sireletsang betri, lisebelisoa tsa boto ea potoloho e tenyetsehang, likarolo tse sireletsang malakabe, ho sebelisoa thepa e tala ea TPU e thibelang malakabe e fetotsoeng le e sireletsang haholo.
7. Mokhoa oa Nts'etsopele oa Lisebelisoa tse Tala tsa TPU
Ka ntlafatso ea tlhahiso ea indasteri le ntlafatso ea litlhoko tsa ts'ireletso ea tikoloho, thepa e tala ea TPU e ntse e tsoela pele ho ea ts'ebetsong e phahameng, ts'ireletso ea tikoloho le ho e etsa ka mokhoa o ikhethileng. Indasteri e ikemiselitse ho etsa lipatlisiso le ho nts'etsapele thepa e tala ea polyol e thehiloeng biong ho nkela thepa e tala ea setso e thehiloeng peteroleng sebaka, ho fokotsa mesi e tsoang khaboneng. Ka nako e ts'oanang, ho hanyetsa boemo ba leholimo bo phahameng, ho lieha ha malakabe a mangata, ponaletso e phahameng le thepa e khethehileng ea TPU e hanelang mocheso o tlase haholo li ntse li hlahlojoa khafetsa ho fihlela litlhoko tse thata tsa ts'ebetso ea matla a macha, sefofane, bongaka ba maemo a holimo le masimo a mang a hlahang. Ho phaella moo, thepa e tala ea TPU e ka sebelisoang hape le e ka bolang e fetohile tataiso ea bohlokoa ea lipatlisiso, e khothalletsang nts'etsopele e tsitsitseng ea indasteri ea TPU.
Nako ea poso: Phuptjane-15-2026