Ni irihe tandukaniro riri hagati ya TPU na PU?

Ni irihe tandukaniro riri hagati yaTPUna PU?

TPU (elastomer ya polyurethane)

TPU (Thermoplastic Polyurethane Elastomer)ni ubwoko bwa pulasitiki bugenda buzamuka. Bitewe n'uko bworoshye gutunganya, kwihanganira ikirere, no kutabangamira ibidukikije, TPU ikoreshwa cyane mu nganda zifitanye isano nk'ibikoresho by'inkweto, imiyoboro, filime, imigozi, insinga n'insinga.

Elastomer ya thermoplastic ya polyurethane, izwi kandi nka thermoplastic polyurethane rubber, mu magambo ahinnye nka TPU, ni ubwoko bwa (AB) n-block linear polymer. A ni polyester cyangwa polyether ifite uburemere bwinshi bwa molekile (1000-6000), naho B ni diol irimo atome 2-12 za karuboni zigororotse. Imiterere ya shimi iri hagati y’ibice bya AB ni diisocyanate, akenshi ihuzwa na MDI.

Rubber ya polyurethane ya thermoplastic ishingiye ku guhuza hagati ya hydrogen cyangwa guhuza byoroheje hagati y’iminyururu minini, kandi izi nyubako ebyiri zihuza zishobora gusubizwa inyuma uko ubushyuhe bwiyongera cyangwa bugabanuka. Mu gihe cy’ishongeshwa cyangwa cy’umuti, imbaraga hagati ya molecule ziragabanuka, kandi nyuma yo gukonja cyangwa gushonga, imbaraga zikomeye hagati ya molecule zirahuza, zigasubiza imiterere y’ikintu cy’umwimerere.

Elastomeri za thermoplastic za polyurethanebishobora gushyirwa mu moko abiri: polyester na polyether, hamwe n'uduce tw'umweru tudahuje neza cyangwa inkingi hamwe n'ubucucike bwa 1.10-1.25. Ubwoko bwa polyether bufite ubucucike buke ugereranije n'ubwoko bwa polyester. Ubushyuhe bw'impinduka mu kirahuri bw'ubwoko bwa polyether ni 100.6-106.1 ℃, naho ubw'ubwoko bwa polyester ni 108.9-122.8 ℃. Ubushyuhe bworoshye bw'ubwoko bwa polyether n'ubwoko bwa polyester buri munsi ya -62 ℃, mu gihe ubushyuhe buke bw'ubwoko bwa ether ikomeye buruta ubw'ubwoko bwa polyester.

Ibintu bidasanzwe biranga elastomer za polyurethane thermoplastic ni ubudahangarwa bwiza bwo kwangirika, ubudahangarwa bwiza bwa ozone, ubukana bwinshi, imbaraga nyinshi, ubushyuhe bwiza, ubudahangarwa bwiza bwo hasi, ubudahangarwa bwiza bwa peteroli, ubudahangarwa bwiza bwa shimi, no kudahangarwa n'ibidukikije. Mu bidukikije bikonje, kudahangarwa neza kwa hydrolysis ya polyester esters biruta kure cyane ubwoko bwa polyester.

Elastomer za polyurethane thermoplastic ntizigira uburozi kandi ntizigira impumuro mbi, zishobora gushonga mu bintu nka methyl ether, cyclohexanone, tetrahydrofuran, dioxane, na dimethylformamide, ndetse no mu bintu bivanze bigizwe na toluene, ethyl acetate, butanone, na acetone ku rugero rukwiye. Zigaragaza imiterere idafite ibara kandi ibonerana kandi zifite uburyo bwo kubika neza.