He aha ka ʻokoʻa ma waena o ka TPU a me ka PU?

He aha ka ʻokoʻa ma waena oTPUa me PU?

TPU (elastomer polyurethane)

TPU (Thermoplastic Polyurethane Elastomer)he ʻano palakiko e kū mai ana. Ma muli o kona hiki ke hana maikaʻi ʻia, ke kūpaʻa ʻana i ka wā, a me ke aloha i ke kaiapuni, hoʻohana nui ʻia ʻo TPU i nā ʻoihana pili e like me nā mea kāmaʻa, nā paipu, nā kiʻiʻoniʻoni, nā wili, nā kaula, a me nā uea.

ʻO ka polyurethane thermoplastic elastomer, i ʻike ʻia hoʻi ʻo ka thermoplastic polyurethane rubber, i hoʻopōkole ʻia ʻo TPU, he ʻano ia o ka (AB) n-block linear polymer. ʻO A kahi polyester kaumaha molekala kiʻekiʻe (1000-6000) a i ʻole polyether, a ʻo B kahi diol e loaʻa ana he 2-12 mau ʻātoma kalapona kaulahao pololei. ʻO ke ʻano kemika ma waena o nā ʻāpana AB he diisocyanate, i hoʻopili pinepine ʻia e MDI.

Hilinaʻi ka ʻōpala polyurethane thermoplastic i ka hoʻopaʻa hydrogen intermolecular a i ʻole ka hoʻopili ʻana maʻalahi ma waena o nā kaulahao macromolecular, a hiki ke hoʻohuli ʻia kēia mau ʻano hoʻopili ʻelua me ka hoʻonui ʻana a i ʻole ka emi ʻana o ka mahana. I ke kūlana hoʻoheheʻe ʻia a i ʻole ka hopena, nāwaliwali nā mana intermolecular, a ma hope o ka hoʻomaʻalili ʻana a i ʻole ka mahu ʻana o ka solvent, hoʻopili pū nā mana intermolecular ikaika, e hoʻihoʻi ana i nā waiwai o ka mea paʻa mua.

Nā elastomers thermoplastic polyurethaneHiki ke hoʻokaʻawale ʻia i ʻelua ʻano: polyester a me polyether, me nā ʻāpana poepoe a kolamu paha keʻokeʻo a me ka nui o 1.10-1.25. ʻOi aku ka haʻahaʻa o ka nui o ka polyether ma mua o ke ʻano polyester. ʻO ka mahana hoʻololi aniani o ke ʻano polyether he 100.6-106.1 ℃, a ʻo ke ʻano polyester he 108.9-122.8 ℃. ʻOi aku ka haʻahaʻa o ka mahana brittleness o ke ʻano polyether a me ke ʻano polyester ma mua o -62 ℃, ʻoiai ʻoi aku ka maikaʻi o ke kūpaʻa haʻahaʻa o ke ʻano ether paʻakikī ma mua o ke ʻano polyester.

ʻO nā hiʻohiʻona koʻikoʻi o nā elastomers thermoplastic polyurethane he kūpaʻa maikaʻi loa i ka ʻaʻahu ʻana, kūpaʻa ozone maikaʻi loa, paʻakikī kiʻekiʻe, ikaika kiʻekiʻe, elasticity maikaʻi, kūpaʻa haʻahaʻa, kūpaʻa aila maikaʻi, kūpaʻa kemika, a me ke kūpaʻa kaiapuni. I nā wahi haumākū, ʻoi aku ka paʻa o ka hydrolysis o nā esters polyether ma mua o nā ʻano polyester.

ʻAʻohe ʻawaʻawa a ʻala ʻole nā ​​elastomers thermoplastic polyurethane, hiki ke hoʻoheheʻe ʻia i loko o nā mea hoʻoheheʻe e like me ka methyl ether, cyclohexanone, tetrahydrofuran, dioxane, a me dimethylformamide, a me nā mea hoʻoheheʻe i hui pū ʻia me toluene, ethyl acetate, butanone, a me acetone i nā ʻāpana kūpono. Hōʻike lākou i kahi kūlana kala ʻole a moakaka a loaʻa iā lākou ke kūpaʻa mālama maikaʻi.