I ka nui o nā noi polymer, ʻo ka degradation kahi hana makemake ʻole. Ke alakaʻi pinepine nei ia i nā hoʻololi i ka kemika a me ke kino o ka polymer, e alakaʻi ana i ka nalowale o nā waiwai pono he nui. Hiki i ka hoʻohaʻahaʻa ʻana o UV o nā polymers ke hoʻopilikia maikaʻi ʻole i ke kaumaha molekala, ka pale ʻana i ka hopena, ka elongation i ka wā haki, ka ʻōlinolino a me ke kala. Hiki ke hoʻolōʻihi ʻia kēlā ʻano pōʻino ma o ka hoʻohui ʻana i nā mea hoʻoponopono i ka wā. Kūkākūkā i nā kikoʻī i ke kumu o nā mea hoʻopaʻa māmā / UV absorbers a me nā hana o ka hoʻohaʻahaʻa ʻana i nā polymers like ʻole. Eia hou, e kiʻi i nā ʻōlelo aʻoaʻo no ke koho ʻana i ka mea hoʻopaʻa kukui / UV absorber kūpono loa no kāu noi polymer a me nā kumu hoʻohālike.
Pono nā stabilizer māmā a me nā UV absorbers i nā polymers
Ua kaupalena ʻia ke ola pono o nā polymers e ko lākou hoʻohaʻahaʻa ʻana. Hiki ke hoʻohaʻahaʻa ʻia e nā kumu kaiapuni he nui e like me ka mahana, ka haʻahaʻa, nā haumia, nā ukana mechanical, radiation, microorganisms, kemika a me ka ea.
ʻO nā mea hoʻopaʻa māmā a me nā mea hoʻopau UV e pale i ka hoʻohaʻahaʻa ʻana o nā polymers ma lalo o ka mana o:
Ka lā
nā kukui ultraviolet
wela
hana me ka oxygen
No ka la'ana, he nui ka 'enekinia thermoplastics e like me polyamides, ka mea i ho'ohana mua 'ia ma waho o ka ho'ohana 'ana i waho, koi 'ia ka pa'a o UV no ka manawa lō'ihi. Hiki ke hoʻohana ʻia ʻo Polybutylene terephthalate (PBT) i nā noi waho o waho o nā kaʻa. Polyurethane-mea huahana hope e like me nā ʻoki puka kaʻa, nā dashboards, nā huila hoʻokele, nā mea hoʻopaʻa puka makani, nā poʻo a me nā hoʻopaʻa lima, a me nā kapuaʻi kāmaʻa ke hoʻohaʻahaʻa i ka wela a me ka māmā. ʻO kēia hoʻohaʻahaʻa e alakaʻi i ka weheʻana a me ka hanaʻana o nā māwae.
ʻO ka hoʻohui ʻana o nā mea hoʻopaʻa māmā a me nā mea hoʻopili UV i nā hui polymer hiki ke hoʻomaikaʻi i ke ʻano / aesthetics a me ka lōʻihi o ka huahana. ʻO ke koho o ka light stabilizer/UV absorber e hilinaʻi nui ʻia i ka substrate e pale ʻia, kona ola hana i manaʻo ʻia a me kona hiki ke hoʻoneʻe i ka photodegradation.
ʻO nā mea hoʻopaʻa māmā maʻamau i hoʻohana pinepine ʻia i loko o nā plastics he mau mea hoʻokūpaʻa māmā amine (HALS).
ʻO nā mea hoʻoheheʻe UV maʻamau he benzotriazoles, benzophenones, a me nā pūhui organonickel.
Nā hopena hoʻohaʻahaʻa UV ma nā Polymers
Hiki ke loiloi ʻia ka hopena o ka hoʻohaʻahaʻa ʻana o UV ma nā polymers mai nā kumu i kūkākūkā ʻia ma lalo nei.
