Kini iyato laarin TPU ati PU?

Kini iyato laarinTPUati PU?

TPU (elastomer polyurethane)

TPU (Thermoplastic Polyurethane Elastomer)jẹ ẹya nyoju ṣiṣu orisirisi. Nitori ilana ṣiṣe ti o dara, resistance oju ojo, ati ore ayika, TPU ni lilo pupọ ni awọn ile-iṣẹ ti o jọmọ bii awọn ohun elo bata, awọn paipu, awọn fiimu, awọn rollers, awọn kebulu, ati awọn okun waya.

Polyurethane thermoplastic elastomer, tun mọ bi thermoplastic polyurethane roba, abbreviated bi TPU, jẹ iru kan ti (AB) n-block laini polima. A jẹ iwuwo molikula giga (1000-6000) polyester tabi polyether, ati B jẹ diol ti o ni awọn ọta erogba pq 2-12 taara. Eto kemikali laarin awọn apakan AB jẹ diisocyanate, nigbagbogbo ni asopọ nipasẹ MDI.

Thermoplastic polyurethane roba da lori intermolecular hydrogen imora tabi ìwọnba-agbelebu laarin awọn ẹwọn macromolecular, ati awọn wọnyi meji ọna asopọ agbelebu awọn ẹya jẹ iyipada pẹlu jijẹ tabi din iwọn otutu. Ni ipo didà tabi ojutu, awọn ipa intermolecular nrẹwẹsi, ati lẹhin itutu agbaiye tabi itujade iyọkuro, awọn agbara intermolecular ti o lagbara so pọ, mimu-pada sipo awọn ohun-ini ti ipilẹ atilẹba.

Polyurethane thermoplastic elastomersle ṣe ipin si awọn oriṣi meji: polyester ati polyether, pẹlu awọn patikulu alaibamu funfun tabi awọn patikulu ọwọn ati iwuwo ibatan ti 1.10-1.25. Iru polyether ni iwuwo ibatan kekere ju iru polyester lọ. Iwọn otutu iyipada gilasi ti iru polyether jẹ 100.6-106.1 ℃, ati ti iru polyester jẹ 108.9-122.8 ℃. Iwọn otutu brittleness ti iru polyether ati iru polyester jẹ kekere ju -62 ℃, lakoko ti iwọn otutu kekere ti iru ether lile dara ju ti iru polyester lọ.

Awọn abuda to dayato ti polyurethane thermoplastic elastomers jẹ resistance yiya ti o dara julọ, resistance osonu ti o dara julọ, líle giga, agbara giga, elasticity ti o dara, iwọn otutu kekere, resistance epo ti o dara, resistance kemikali, ati resistance ayika. Ni awọn agbegbe ọrinrin, iduroṣinṣin hydrolysis ti polyether esters jina ju ti awọn iru polyester lọ.

Polyurethane thermoplastic elastomers kii ṣe majele ati odorless, tiotuka ninu awọn ohun mimu bi methyl ether, cyclohexanone, tetrahydrofuran, dioxane, ati dimethylformamide, bakannaa ninu awọn nkan ti o dapọ ti o jẹ ti toluene, ethyl acetate, butanone, ati acetone ni awọn iwọn ti o yẹ. Wọn ṣe afihan ipo ti ko ni awọ ati sihin ati ni iduroṣinṣin ipamọ to dara.