ʻO ka UV absorbers ka mea maʻamau i hoʻohana ʻia i nā mea hoʻopaʻa māmā, hiki ke hoʻopaʻa i ke kukui ultraviolet kokoke a hoʻopau i ka ikehu māmā. Hiki i ka ultraviolet absorber pono'ī ke komo i ka ikehu kukui ultraviolet, a laila hoʻololi i ke ʻano o ka ikehu wela e hoʻohaumia ʻole i ke kaiapuni a hoʻokuʻu iā ia, akā ʻaʻole ia e komo i ka mālamalama ʻike ponoʻī, a he photostability maikaʻi. No laila he aha ke ʻano o ka hana a ka mea hoʻoheheʻe waho loa?
ʻO ke ʻano o ka hana o nā mea hoʻopau UV
Loaʻa i ka UV absorber kahi ʻano molekala kūikawā, a ʻo ka hapa nui o nā hale i loaʻa nā paʻa hydrogen intramolecular. Ma lalo o nā kūlana maʻamau, ua pani ʻia nā paʻa hydrogen. Ke hoʻomālamalama ʻia e ke kukui ultraviolet me ka lōʻihi o ka nalu o 290-400 nm, e hoʻopaʻa i ka ikehu kukui ultraviolet a loaʻa i ka hauʻoli. ʻO ka intramolecular proton transfer wehe i ka intramolecular hydrogen paʻa, lilo ka mole i kahi ʻano ketone paʻa ʻole a hoʻi i ka ʻāina, a ma ka manawa like e hoʻohuli i ka ikehu māmā i ka ikehu wela a hoʻokuʻu iā ia, ʻo ia ka mea e like me ka hoʻomoʻa ʻana i ka ikehu o ke kukui ultraviolet ma o ia iho, e pale ana i ka nui Ua hoʻopilikia ʻia ka ʻōnaehana mole e ka ikehu o ke kukui ultraviolet a i ʻole ka polymer o ke kiʻi.
ʻO nā ʻano like ʻole o ka UV absorbers he mau pūʻulu hana maikaʻi like ʻole, a hiki ke hoʻokaʻawale ʻia i benzotriazoles, benzophenones, triazines, salicylates, etc. e like me kā lākou mau hana kemika. Hōʻike ʻia nā ʻano hana o nā ʻano like ʻole ma ke kiʻi ma luna.
Hiki i nā mea hoʻoheheʻe UV ʻokoʻa ke komo i nā kukuna ultraviolet o nā lōʻihi hawewe like ʻole. I ka hoʻohana ʻana, pono e koho ʻia ka UV absorber e like me ke ʻano o ka polymer.
Pono e loaʻa i kahi mea hoʻoheheʻe UV maikaʻi kēia mau ʻano: paʻa kemika maikaʻi, ʻaʻohe hopena ʻino me nā mea waiwai o ka huahana; ka omo ikaika ʻana o nā kukuna UV (ʻoi aku ka nui o nā kukuna UV me ka lōʻihi hawewe o 290-400nm); miscibility maikaʻi a me ka like ʻole Hoʻopuehu i loko o ka mea, ʻaʻohe hau, ʻaʻohe exudation; maikaʻi ka paʻa wela, ʻoiai i ka wā o ka hoʻoili ʻana, ʻaʻole ia e loli ma muli o ka wela, a liʻiliʻi ka volatility thermal; ʻO ka absorber ponoʻī he paʻa photochemical maikaʻi, ʻaʻohe decomposition, ʻaʻohe discoloration; ʻAʻohe kala, ʻaʻohe mea ʻawaʻawa, ʻaʻala ʻole; maʻalahi a maʻalahi ke loaʻa; kūʻē i ka luʻu ʻana.
