mea hoʻopaʻa māmā
Hoʻohana ʻia nā mea hoʻopaʻa māmā no ka pale ʻana i nā plastik a me nā mea ʻē aʻe mai ka pōʻino mai ka -ʻike lōʻihi i ka pāhawewe ultraviolet. ʻO ka wehe ʻana o nā plastics i ka radiation ultraviolet mai ka lā e hoʻomaka i ka hoʻohaʻahaʻa ʻana ma o ke kaʻina o ka photooxidation. Hiki i kēia ke loaʻa nā hopena maikaʻi ʻole e like me ka hoʻololi ʻana i ka helehelena (ka hoʻololi ʻana, ka hoʻololi ʻana i ka nani a/a i ka chalking), ka hoʻemi ʻana i nā waiwai mechanical a me ka hoʻokumu ʻana i nā hemahema ʻike ʻia e like me nā māwae. ʻO nā kukui fluorescent i hoʻohana ʻia no ka hoʻomālamalama ʻana i loko e hoʻokuʻu i ka radiation UV, akā ma nā pae haʻahaʻa haʻahaʻa ma mua o ka lā.
E like me ke ʻano o ka thermal oxidation, photooxidation kahi kaʻina hana kaulahao e pili ana i nā radical manuahi a me nā intermediates hydroperoxide. Kāohi nā Photostabilizers i kēia kaʻina hana ma ka ʻohi ʻana i nā intermediates reactive a i ʻole ma ka hoʻokūkū hoʻokūkū ʻana i ka radiation UV pōʻino.
Hoʻohana nui ʻia nā amine light stabilizers (HALS) ma ka hoʻopaʻa ʻana i nā intermediates radical manuahi i ke kaʻina photooxidation. He mea maikaʻi loa ka HALS no ka hoʻopaʻa māmā ʻana o nā polyolefins, nā polymers styrenic a me kekahi mau mea ʻenekinia.
Ke hana nei nā mea hoʻoheheʻe Ultraviolet (UV) ma ka pale ʻana i loko o nā ʻāpana plastik mai ka hōʻino ʻana i ka radiation UV. Hōʻike ʻia kēia mau huahana e ka absorption UV ikaika loa a me kahi kiʻekiʻe o ka photostability inherent. Hiki i nā mea hoʻoheheʻe UV ke hoʻopaʻa i nā plastics he nui, me ka PVC a me nā plastic engineering. Hoʻohana ʻia lākou i nā palapala hoʻopihapiha plastik e pale i nā ʻikepili mai ka radiation UV.
ʻO ka hui pū ʻana o HALS a me nā UV absorbers e hōʻike pinepine i ka hana synergistic ma luna o ka stabilizer māmā wale nō.
