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

He aha ka ʻokoʻa ma waenaTPUa me ka PU?

TPU (polyurethane elastomer)

TPU (Thermoplastic Polyurethane Elastomer)he ʻano plastik e puka mai ana. Ma muli o kona kaʻina hana maikaʻi, ka pale ʻana i ka ea, a me ke aloha o 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, ka mea i ʻike ʻia he thermoplastic polyurethane rubber, i hoʻopau ʻia ʻo TPU, he ʻano o (AB) n-block linear polymer. He polyester a i ʻole polyether ke kaumaha molekala kiʻekiʻe (1000-6000) a ʻo B he diol i loko o 2-12 mau ʻātoma kalapona kaulahao pololei. ʻO ka hana kemika ma waena o nā ʻāpana AB he diisocyanate, pili pinepine ʻia e MDI.

Ke hilinaʻi nei ka Thermoplastic polyurethane rubber i ka intermolecular hydrogen bonding a i ʻole ka hoʻopā ʻana ma waena o nā kaulahao macromolecular, a hiki ke hoʻohuli ʻia kēia mau mea hoʻohui keʻa ʻelua me ka piʻi a emi ʻana o ka mahana. Ma ke kūlana hoʻoheheʻe a i ʻole ka hoʻonā ʻana, nāwaliwali nā pūʻali intermolecular, a ma hope o ka hoʻolili ʻana a i ʻole ka hoʻoheheʻe ʻana i ka solvent, hoʻohui pū nā pūʻali ikaika intermolecular, e hoʻihoʻi i nā waiwai o ka paʻa kumu.

Polyurethane thermoplastic elastomersHiki ke hoʻokaʻawale ʻia i ʻelua mau ʻano: polyester a me polyether, me nā ʻāpana spherical irregular a i ʻole columnar keʻokeʻo a me kahi pānaʻi pili o 1.10-1.25. He haʻahaʻa haʻahaʻa ko ke ʻano 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 ʻo 108.9-122.8 ℃. ʻOi aku ka haʻahaʻa o ka mahana brittleness o ka polyether type a me ka polyester type ma mua o -62 ℃, aʻo ka haʻahaʻa haʻahaʻa haʻahaʻa o ke ʻano ether paʻakikī ʻoi aku ka maikaʻi ma mua o ke ʻano polyester.

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

ʻO ka polyurethane thermoplastic elastomers he meaʻawaʻawaʻole a heʻalaʻole, hiki ke hoʻoheheʻeʻia i loko o nā mea hoʻoheheʻe e like me methyl ether, cyclohexanone, tetrahydrofuran, dioxane, a me dimethylformamide, a me nā mea hoʻoheheʻe huiʻia i hakuʻia me toluene, ethyl acetate, butanone, a me ka acetone i nā kūpono kūpono. Hōʻike lākou i kahi ʻano waihoʻoluʻu a maopopo a loaʻa ke kūpaʻa mālama maikaʻi.