ʻO ka ʻokoʻa ma waena o ke ʻano TPU polyether a me ke ʻano polyester

ʻO ka ʻokoʻa ma waenaʻAno polyether TPUa meʻano polyester

Hiki ke hoʻokaʻawale ʻia ka TPU i ʻelua ʻano: ʻano polyether a me ke ʻano polyester. Wahi a nā koi like ʻole o nā noi huahana, pono e koho ʻia nā ʻano TPU like ʻole. No ka laʻana, inā kiʻekiʻe loa nā koi no ke kūʻē ʻana i ka hydrolysis, ʻoi aku ka kūpono o ka TPU ʻano polyether ma mua o ka TPU ʻano polyester.

No laila i kēia lā, e kamaʻilio kākou e pili ana i nā ʻokoʻa ma waenaʻano polyether TPUa meʻano polyester TPU, a pehea e hoʻokaʻawale ai iā lākou? E wehewehe ana kēia ma lalo nei i ʻehā mau ʻano: nā ʻokoʻa o nā mea maka, nā ʻokoʻa o ke kūkulu ʻana, nā hoʻohālikelike hana, a me nā ʻano ʻike.

1. Nā ʻokoʻa o nā mea maka

Manaʻo wau ua ʻike ka poʻe he nui i ke kumumanaʻo o nā elastomers thermoplastic, nona kahi hiʻohiʻona hoʻonohonoho o ka loaʻa ʻana o nā ʻāpana palupalu a paʻakikī, kēlā me kēia, e lawe mai i ka maʻalahi a me ka paʻakikī i ka mea.

Loaʻa i ka TPU nā ʻāpana kaulahao palupalu a paʻakikī, a ʻo ka ʻokoʻa ma waena o ka TPU ʻano polyether a me ka TPU ʻano polyester aia i ka ʻokoʻa o nā ʻāpana kaulahao palupalu. Hiki iā mākou ke ʻike i ka ʻokoʻa mai nā mea maka.

ʻAno Polyether TPU: 4-4'- diphenylmethane diisocyanate (MDI), polytetrahydrofuran (PTMEG), 1,4-butanediol (BDO), me kahi dosage ma kahi o 40% no MDI, 40% no PTMEG, a me 20% no BDO.

ʻAno Polyester TPU: 4-4 '- diphenylmethane diisocyanate (MDI), 1,4-butanediol (BDO), adipic acid (AA), me MDI e helu ana ma kahi o 40%, AA e helu ana ma kahi o 35%, a ʻo BDO e helu ana ma kahi o 25%.

Hiki iā mākou ke ʻike ʻo ka mea maka no ka ʻāpana kaulahao palupalu TPU ʻano polyether ʻo polytetrahydrofuran (PTMEG); ʻO ka mea maka no nā ʻāpana kaulahao palupalu TPU ʻano polyester ʻo ia ka adipic acid (AA), kahi e hana ai ka adipic acid me ka butanediol e hana i ka polybutylene adipate ester ma ke ʻano he ʻāpana kaulahao palupalu.

2. Nā ʻokoʻa kūkulu

ʻO ke kaulahao molekala o TPU he ʻano laina poloka ʻano-n (AB), kahi ʻo A he polyester a polyether kaumaha molekala kiʻekiʻe (1000-6000), ʻo B ka butanediol maʻamau, a ʻo ke ʻano kemika ma waena o nā ʻāpana kaulahao AB he diisocyanate.

Wahi a nā ʻano like ʻole o A, hiki ke hoʻokaʻawale ʻia ka TPU i ke ʻano polyester, ke ʻano polyether, ke ʻano polycaprolactone, ke ʻano polycarbonate, a pēlā aku. ʻO nā ʻano maʻamau ka ʻano polyether TPU a me ka ʻano polyester TPU.

Mai ke kiʻi ma luna, hiki iā mākou ke ʻike he mau ʻano linear nā kaulahao molekala holoʻokoʻa o ka ʻano polyether TPU a me ka ʻano polyester TPU, me ka ʻokoʻa nui inā he polyether polyol a he polyester polyol paha ka ʻāpana kaulahao palupalu.

3. Hoʻohālikelike hana

ʻO nā polyols polyether he mau polymer waiʻona a i ʻole oligomers me nā pilina ether a me nā hui hydroxyl ma nā hui hope ma ke ʻano kaulahao nui molekala. Ma muli o kona ikehu cohesive haʻahaʻa o nā pilina ether i loko o kona ʻano a me ka maʻalahi o ka wili ʻana.

No laila, loaʻa i ka polyether TPU ka maʻalahi o ka haʻahaʻa haʻahaʻa, ke kū'ē i ka hydrolysis, ke kū'ē i ka ʻōpala, ke kū'ē i ka UV, a me nā mea ʻē aʻe. He manaʻo lima maikaʻi ko ka huahana, akā ʻaʻole maikaʻi ka ikaika o ka ʻili a me ka ikaika haki.

Hiki i nā hui ester me ka ikehu hoʻopaʻa covalent ikaika i loko o nā polyols polyester ke hana i nā pilina hydrogen me nā ʻāpana kaulahao paʻakikī, e lawelawe ana ma ke ʻano he mau kiko crosslinking elastic. Eia nō naʻe, he maʻalahi ka polyester i ka haki ʻana ma muli o ke komo ʻana o nā molekala wai, a ʻo ka waikawa i hana ʻia e ka hydrolysis hiki ke hoʻoulu hou i ka hydrolysis o ka polyester.

No laila, he waiwai maikaʻi loa ka polyester TPU, ke kūpaʻa ʻana i ke kapa, ke kūpaʻa ʻana i ka haehae, ke kūpaʻa ʻana i ka corrosion kemika, ke kūpaʻa wela kiʻekiʻe, a me ka hana maʻalahi, akā ʻaʻole kūpaʻa ka hydrolysis.

4. ʻAno ʻike

No ke ʻano o ka TPU ʻoi aku ka maikaʻi e hoʻohana ai, hiki ke ʻōlelo ʻia e kau ʻia ke koho ʻana ma muli o nā koi kino o ka huahana. No ka hoʻokō ʻana i nā waiwai mechanical maikaʻi, e hoʻohana i ka polyester TPU; Inā e noʻonoʻo ana i ke kumukūʻai, ka nui, a me ke kaiapuni hoʻohana huahana, e like me ka hana ʻana i nā huahana leʻaleʻa wai, ʻoi aku ka kūpono o ka polyether TPU.

Eia nō naʻe, i ke koho ʻana, a i ʻole ke kāwili hewa ʻana i ʻelua ʻano TPU, ʻaʻohe o lākou ʻokoʻa nui i ke ʻano. No laila pehea mākou e hoʻokaʻawale ai iā lākou?

Nui nā ʻano hana, e like me ke kala kemika, ke kinoea chromatography-mass spectrometry (GCMS), ka mid infrared spectroscopy, a pēlā aku. Eia nō naʻe, koi kēia mau ʻano hana i nā koi loea kiʻekiʻe a lōʻihi ka manawa.

Aia kekahi ʻano hana ʻike maʻalahi a wikiwiki hoʻi? ʻAe ka pane, no ka laʻana, ke ʻano hoʻohālikelike density.

Hoʻokahi wale nō mea hoʻāʻo density e pono ai no kēia ʻano hana. Ma ka lawe ʻana i kahi mika density rubber kiʻekiʻe ma ke ʻano he laʻana, ʻo nā ʻanuʻu ana:

E kau i ka huahana i loko o ka papa ana, e hōʻike i ke kaumaha o ka huahana, a kaomi i ke kī Enter e hoʻomanaʻo.
E kau i ka huahana i loko o ka wai e hōʻike i ka waiwai o ka mānoanoa.
ʻO ke kaʻina hana ana holoʻokoʻa e lawe ma kahi o 5 kekona, a laila hiki ke hoʻokaʻawale ʻia ma muli o ke kumumanaʻo ʻoi aku ka kiʻekiʻe o ka nui o ke ʻano polyester TPU ma mua o ke ʻano polyether TPU. ʻO ka laulā nui kikoʻī: ʻano polyether TPU -1.13-1.18 g/cm3; Polyester TPU -1.18-1.22 g/cm3. Hiki i kēia ʻano hana ke hoʻokaʻawale koke ma waena o ke ʻano TPU polyester a me ke ʻano polyether.