Hoʻolauna

ʻO nā antioxidants (a i ʻole nā ​​mea hoʻopaʻa wela) he mau mea hoʻohui i hoʻohana ʻia e kāohi a hoʻopaneʻe paha i ka hōʻino ʻia ʻana o nā polymers ma muli o ka oxygen a i ʻole ka ozone i ka lewa. ʻO lākou nā mea hoʻohui i hoʻohana nui ʻia i nā mea polymer. E hana ʻia nā uhi i ka hōʻino ʻana o ka oxidation thermal ma hope o ka hoʻomoʻa ʻia ʻana i nā mahana kiʻekiʻe a i ʻole ka hōʻike ʻana i ka lā. ʻO nā hanana e like me ka ʻelemakule a me ka melemele e hoʻopilikia nui i ke ʻano a me ka hana o ka huahana. I mea e pale ai a hōʻemi paha i ka hanana o kēia ʻano, hoʻohui pinepine ʻia nā antioxidants.

ʻO ka hoʻohaʻahaʻa ʻana o ka oxidation thermal o nā polymers ke kumu nui ʻia e ka hopena radical manuahi ʻano kaulahao i hoʻomaka ʻia e nā radical manuahi i hana ʻia e nā hydroperoxides i ka wā e hoʻomehana ʻia ai. Hiki ke kāohi ʻia ka hoʻohaʻahaʻa ʻana o ka oxidation thermal o nā polymers e ka hopu ʻana i nā radical manuahi a me ka hoʻokaʻawale ʻana o ka hydroperoxide, e like me ka mea i hōʻike ʻia ma ke kiʻi ma lalo nei. I waena o lākou, hiki i nā antioxidants ke kāohi i ka oxidation i luna a no laila ua hoʻohana nui ʻia.

Nā ʻano antioxidants

Nā mea pale ʻonahiki ke hoʻokaʻawale ʻia i ʻekolu mau māhele e like me kā lākou mau hana (ʻo ia hoʻi, ko lākou komo ʻana i ke kaʻina hana kemika auto-oxidation):

nā antioxidants e hoʻopau ana i ke kaulahao: hopu nui lākou a wehe paha i nā radical manuahi i hana ʻia e ka polymer auto-oxidation;

nā antioxidants e hoʻoheheʻe ana i ka hydroperoxide: hoʻolaha nui lākou i ka hoʻoheheʻe ʻole ʻana o nā hydroperoxides i loko o nā polymers;

nā antioxidants passivating ion metala: hiki iā lākou ke hana i nā chelates paʻa me nā ion metala ʻino, no laila e passivating i ka hopena catalytic o nā ion metala ma ke kaʻina hana auto-oxidation o nā polymers.

Ma waena o nā ʻano antioxidants ʻekolu, ua kapa ʻia nā antioxidants chain-terminating he mau antioxidants mua, ʻo nā phenols hindered nui a me nā amines aromatic lua; ʻo nā ʻano ʻelua ʻē aʻe ua kapa ʻia he mau antioxidants kōkua, me nā phosphites a me nā paʻakai metala dithiocarbamate. I mea e loaʻa ai kahi uhi paʻa e hoʻokō ai i nā koi noi, koho pinepine ʻia ka hui pū ʻana o nā antioxidants he nui.

Ka hoʻohana ʻana o nā antioxidants i nā uhi

1. Hoʻohana ʻia i loko o ka alkyd, polyester, polyester unsaturated
I loko o nā ʻāpana alkyd i loaʻa ka ʻaila, aia nā pilina pālua i nā kekelē like ʻole. Hoʻopau maʻalahi ʻia nā pilina pālua hoʻokahi, nā pilina pālua he nui, a me nā pilina pālua i hoʻohui ʻia e hana i nā peroxides i nā mahana kiʻekiʻe, e hoʻolilo ana i ke kala i ʻeleʻele, ʻoiai hiki i nā antioxidants ke hoʻokaʻawale i nā hydroperoxides e hoʻomālamalama i ke kala.

2. Hoʻohana ʻia i ka synthesis o ka mea hoʻōla PU
ʻO ka mea hoʻōla PU ma ke ʻano laulā e pili ana i ka prepolymer o trimethylolpropane (TMP) a me toluene diisocyanate (TDI). Ke hōʻike ʻia ka resin i ka wela a me ka mālamalama i ka wā o ka synthesis, e palaho ka urethane i nā amines a me nā olefins a uhaki i ke kaulahao. Inā ʻala ka amine, e oxidized ia e lilo i quinone chromophore.

3. Hoʻohana ʻia i nā uhi pauka thermosetting
He antioxidant i hui pū ʻia o nā antioxidants phosphite kiʻekiʻe a me nā phenolic, kūpono no ka pale ʻana i nā uhi pauka mai ka hoʻohaʻahaʻa oxidative thermal i ka wā o ka hana ʻana, ka hoʻōla ʻana, ka wela nui ʻana a me nā kaʻina hana ʻē aʻe. Hoʻokomo pū ʻia nā noi me ka polyester epoxy, ka isocyanate TGIC i ālai ʻia, nā pani TGIC, nā hui epoxy linear a me nā resins acrylic thermosetting.

Hāʻawi ʻo Nanjing Reborn New Materials i nā ʻano like ʻole onā mea antioxidantno nā ʻoihana palakiko, uhi ʻana, laholio.

Me ka hana hou a me ka holomua o ka ʻoihana uhi ʻana, e ʻike nui ʻia ke koʻikoʻi o nā antioxidants no nā uhi ʻana, a e ākea ka wahi no ka hoʻomohala ʻana. I ka wā e hiki mai ana, e hoʻomohala ʻia nā antioxidants ma ke ala o ka nui o ka molekala pili kiʻekiʻe, ka multifunctionality, ka pono kiʻekiʻe, ka hou, ka compositeness, ka pane ʻana a me ka palekana kaiapuni ʻōmaʻomaʻo. Pono kēia i nā mea hana e hana i ka noiʻi hohonu mai nā ʻano mīkini a me ka noi e hoʻomaikaʻi mau iā lākou, e hana i ka noiʻi hohonu i nā ʻano kūkulu o nā antioxidants, a hoʻomohala hou i nā antioxidants hou a maikaʻi e pili ana i kēia, kahi e loaʻa ai ka hopena nui i ka hana ʻana a me ka hoʻopili ʻana o ka ʻoihana uhi. E hoʻoikaika nui nā antioxidants no nā uhi ʻana i ko lākou hiki nui a lawe mai i nā pono waiwai a me nā ʻenehana maikaʻi loa.