Ke hōʻike ʻia nā pale i waho, hiki ke hoʻohaʻahaʻa nā mea e like me ka makū, ka wela a me ka radiation UV.ʻO ka mea maʻamau, ʻo nā mea maʻalahi loa i ka uhi ʻana he kiʻiʻoniʻoni resins a me nā pauka.ʻO ka hoʻoheheʻe ʻana o Ultraviolet a me ka wai ke kumu e hoʻohaʻahaʻa ʻia ai kēia mau mea, a ʻoi aku ka wikiwiki o kēia mau hopena i ka wā e piʻi ai ka mahana.ʻO ka hoʻohaʻahaʻa ʻana o nā uhi i hoʻokumu ʻia e ka radiation ultraviolet i kapa ʻia he photooxidation.Hoʻomaka ʻia ka hopena e ka radiation ultraviolet.Hoʻopili ka oxygen i ka lewa i ka hoʻohaʻahaʻa kemika.Ua kapa ʻia kēlā mau mea hoʻopaʻa kiʻi photon he chromophores a hiki ke lilo i nā pūʻulu hope o nā ʻāpana puaʻa, iwi hope a polymer binders, haumia, koena solvents, a i ʻole nā mea hoʻohui.Ke komo ʻia nā kiʻi, hoʻopuka ka chromophore i ka ikehu.Loaʻa kēia kaʻina hana ma ka wāwahi ʻana i ka paʻa covalent e hana i ʻelua radical manuahi.ʻO kēia mau radicals he mea maʻamau loa i ka oxygen a hui pū me ka oxygen e hana i nā radical free-centered.I ka wā i hana ʻia ai, hiki i kēia mau radical ke uhaʻi i nā paʻa o nā kemika organik ʻē aʻe ma o nā ʻanuʻu kemika like ʻole, e hana ana i kahi hopena kaulahao e alakaʻi ai i ka polymer degradation.Ma muli o ka polymer, hiki ke ʻike ʻia ka piʻi ʻana a i ʻole ka emi ʻana o ka nui o nā molekole.Hiki i ka mea mua ke hana i ka pohā o ka uhi;Hiki i ka hope ke alakaʻi i ka uhi ʻana i ka viscidity, ka pale ʻana i ka solvent a i ʻole ke kūʻē ʻana.A e nalowale ana ka ʻōlinolino pena, a e loli ke kala.
Ma waho aʻe o ka photooxidation, hiki ke hoʻohaʻahaʻa ʻia ke kiʻiʻoniʻoni e hana ana i ka resin i loko o ka uhi e ka hydrolysis, ʻoi aku ka nui o ka piʻi ʻana o ka mahana o ka uhi ma lalo o ka lā kiʻekiʻe.Ma lalo o kēia mau kūlana, hiki i nā molekala wai i hoʻopaʻa ʻia i loko o ka uhi ke hoʻouka i nā paʻa covalent i loko o ka resin a hoʻokaʻawale i nā kaulahao polymer, e hopena i ke kaumaha molekala haʻahaʻa.ʻOi aku ka maʻalahi o nā resins polyester a me alkyd i kēia hopena ma mua o nā polyurethanes a me nā epoxies.
| HANA | HELU CAS | KAUKAU | HOIKE |
| UV1 | 57834-33-0 | ʻO UV1 kahi mea hoʻohui anti-uv maikaʻi loa, hoʻohana nui ʻia i ka polyurethane, adhesive, foam a me nā mea ʻē aʻe. | |
| UV3303 | 586400-06-8 | Manaʻo ʻia ʻo UV3 ma PU (TPU, RIM) a me nā plastics engineering (PET, PC, PC, ABS, PA, PBT) | |
| UV3331 | 147783-69-5 | SANDUVOR PR 31 | ʻO UV 3331 kahi mea hoʻokūpaʻa māmā amine (HALS) me ka hana o ka UV absorber.ʻo ia ʻike ʻia e kona maikaʻi maikaʻi loa a me kona hiki ke hoʻopaʻa ʻia i loko o ka binder a i ʻole ka polymer matrix i ka wā o ka hoʻolaha ʻana o UV. Hiki ke hoʻohana ʻia ʻo UV3331 i ka polyolefine, polystyrene plastic, PVC, PBT a me nā mea ʻē aʻe. |
| UV3325 | 7443-25-6
| SANDUVOR PR 25 | ʻO UV 3325 kahi mea hoʻoheheʻe UV-B no PVC, polyesters, PC, polyamides, styrene plastics, EVA copolymers, a me cellulosic.
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| LS123 | 129757-67-1 | TINUVINA 123 | Hoʻohana ʻia ʻo LS123 i nā ʻāpana kaʻa, nā ʻāpana ʻoihana, nā mea hoʻonaninani, nā uhi lāʻau, ʻoi aku hoʻi no nā mea paʻa kiʻekiʻe, ka hoʻōla ʻana i ka waikawa i nā kaʻa a me nā pena ʻoihana. |
| LS292 | 41556-26-7 82919-37-7 | TINUVINA 292 | Hiki i ka LS292 ke pale pono i ka haki ʻana, ka nalowale o ka mālamalama a me nā maʻi lacquer ʻē aʻe, hiki ke hoʻomaikaʻi maikaʻi i ke ola lawelawe o ka uhi ʻana, a ʻaʻole e crystallize ka huahana ma ka lumi wela. |
| LS765 | 41556-26-7 82919-37-7 | TINUVIN 765 | Hoʻohana ʻia ʻo LS765 i nā uhi, ʻoi aku ka nui o nā pena kaʻa e pale ai i ka ʻelemakule. ʻO ka LS765 he mea hoʻokūpaʻa wai maikaʻi loa no ka nui o nā polymers a me nā noi, me nā polyurethanes, sealants, adhesives, elastomers, unsaturated polyesters, acrylics, vinyl polymers (PVB, PVC), styrene homopolymers a me nā copolymers, polyene vertical, wai waihoʻoluʻu concentrates a nā substrate organik ʻē aʻe. |