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 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 hoʻopau ʻia ka hoʻoheheʻe ʻana i ka wela ma hope o ka hoʻomoʻa ʻia ʻana i nā mahana kiʻekiʻe a i ʻole ka ʻike ʻana i ka lā. ʻO nā hanana e like me ka ʻelemakule a me ka melemele e hoʻopilikia nui i ka helehelena a me ka hana o ka huahana. I mea e pale ai a hōʻemi paha i ka hiki ʻana mai o kēia ʻano, hoʻohui pinepine ʻia nā antioxidants.

ʻO ka hoʻohaʻahaʻa ʻana o ka thermal oxidation o nā polymers ma muli o ke ʻano kaulahao manuahi manuahi i hoʻomaka ʻia e nā radical manuahi i hana ʻia e hydroperoxides i ka wā i wela ai. Hiki ke pale ʻia ka hoʻohaʻahaʻa ʻana i ka wela o nā polymers e ka hopu radical manuahi a me ka decomposition 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

ʻO nā antioxidantshiki ke hoʻokaʻawale ʻia i ʻekolu mau ʻāpana e like me kā lākou mau hana (ʻo ia hoʻi, kā lākou hana ʻana i ke kaʻina kemika auto-oxidation):

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

hydroperoxide decomposing antioxidants: hoʻolaha nui lākou i ka decomposition non-radical o nā hydroperoxide i nā polymers;

metala ion passivating antioxidants: hiki iā lākou ke hana i nā chelates paʻa me nā iona metala ʻino, a laila e hoʻololi 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 e hoʻopau ana i ke kaulahao he mau antioxidants mua, ka nui o nā phenols a me nā amine aromatic lua; ʻO nā ʻano ʻelua ʻē aʻe i kapa ʻia he mau antioxidants kōkua, me nā phosphites a me nā paʻakai metala dithiocarbamate. No ka loaʻa ʻana o kahi uhi paʻa e kūpono i nā koi noi, koho pinepine ʻia kahi hui o nā antioxidants lehulehu.

Ka hoʻohana ʻana i nā antioxidants i nā uhi

1. Hoʻohana ʻia i ka alkyd, polyester, unsaturated polyester
I loko o nā ʻāpana ʻaila o ka alkyd, aia nā paʻa pālua i nā pae like ʻole. ʻO nā paʻa pālua hoʻokahi, nā paʻa pālua lehulehu, a me nā mea paʻa pālua i hoʻohui ʻia ua maʻalahi ke hoʻoheheʻe ʻia e hana i nā peroxide i nā wela kiʻekiʻe, e ʻeleʻele ai ke kala, ʻoiai hiki i nā antioxidants ke hoʻoheheʻe i nā hydroperoxide e hoʻomāmā i ke kala.

2. Hoʻohana ʻia i ka synthesis o PU curing agent
ʻO ka lāʻau lapaʻau PU 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 māmā i ka wā synthesis, hoʻoheheʻe ka urethane i nā amine a me nā olefins a wāwahi i ke kaulahao. Inā he mea ʻala ka amine, ua hoʻoneʻe ʻia ia e lilo i quinone chromophore.

3. No ka hoʻohana ʻana i nā uhi pauka thermosetting
ʻO kahi antioxidant hui ʻia o ka phosphite kiʻekiʻe a me nā antioxidants phenolic, kūpono no ka pale ʻana i nā uhi pauka mai ka hoʻohaʻahaʻa ʻana i ka thermal oxidative i ka wā o ka hana ʻana, mālama ʻana, overheating a me nā kaʻina hana ʻē aʻe. Loaʻa nā noi i ka polyester epoxy, ka isocyanate TGIC ālai ʻia, nā mea pani TGIC, nā pūhui epoxy linear a me nā resins acrylic thermosetting.

Hāʻawi ʻo Nanjing Reborn New Materials i nā ʻano like ʻoleantioxidantsno ka plastic, ka uhi ʻana, nā ʻoihana lāʻau.

Me ka hana hou a me ka holomua o ka ʻoihana pale, e ʻike nui ʻia ke koʻikoʻi o nā antioxidants no ka uhi ʻana, a ʻoi aku ka ākea o ka hoʻomohala ʻana. I ka wā e hiki mai ana, e hoʻomohala ʻia nā antioxidants i ke ʻano o ka molecular molecular kiʻekiʻe, multifunctionality, high efficiency, newness, compositeness, responsiveness a me ka mālama ʻana i ka ʻōmaʻomaʻo. Pono kēia i nā mea hoʻomaʻamaʻa e hana i ka noiʻi hohonu mai ka mīkini a me nā ʻano noiʻi e hoʻomaikaʻi mau ai iā lākou, e hana i ka noiʻi hohonu e pili ana i nā ʻano hana o nā antioxidants, a e hoʻomohala hou i nā antioxidants hou a maikaʻi hoʻi e pili ana i kēia, e loaʻa ka hopena nui i ka hana a me ka noi ʻana o ka ʻoihana uhi. ʻO nā antioxidants no ka uhi ʻana e hoʻonui i ko lākou mana nui a lawe mai i nā pono waiwai a me ka ʻenehana.