Ultraviolet absoba i ken kisim ol strongpela hai-enerji ultravailet rei, tanim ol long fom bilong eneji, lusim absorbed eneji, na bihain ol i yusim long thermal energy o i no gat bagarap long low-eneji rediesen bilong abrusim ol skin bagarap i kamap long ol hai molekula dekomposisen riaksen i kamap long ol ultraviolet rei, na long stopim ol fotofisik na fotokemikel dekomposisen riaksen i kamap long . absorpsen bilong ol ultraviolet lait. Long nau, ol samting ol i save yusim ol UV i save kisim, em ol i save kisim ol bensofonon, ol benzotriazo, ol salisilet, ol akrilonitriles, ol triasin na ol narapela. I gat sampela samting i narapela kain. Dispela Shanghai Jingyan Kemikal i kam bihain bai kamapim rot bilong mekim wok bilong ol kain kain UV absorba.
1. Ol Bensofeni
Benzophenone UV absorber em i klas bilong UV absorber ol i save yusim moa, we i save kisim UV-A, UV{1}}B na UV{2}}C isi isi. Keton grup na haidroksil grup insait long molekiul inap kamapim wanpela intrinsik haidrojen bon long kamapim wanpela butil chilet ring. Bihain long em i kisim ultraviolet lait eneji, molekiul i go insait long thermal vibresen, intanel haidrojen bon i bruk, elet ring i op, na ultraviolet eneji i tanim i kamap hat eneji na i lusim. Antap long dispela, kabonil grup insait long molekiul bai amamas long absorbed altraviolet lait eneji, na dispela i kamapim mutesen na enol straksa, we i save kisim tu wanpela hap bilong eneji. Long dispela kain UV absorber, strong bilong intramolekula haidrojen bon i pas wantaim lait stebilisesen ifek bilong en. Stabilisasen ifek bilong UV absoba i pas tu wantaim longpela bilong alokoksi sen long bensin ring. Sapos longpela i stret wantaim polima, stebilisesen ifek i stret tasol. Insait long benzophenone UV absoba, posisen bilong orto bilong kabonil i mas gat 10-pela haidroksil grup, sapos nogat em i no inap kamapim intrinsik haidrojen na ol i no inap yusim olsem UV absoba. Kala, gutpela kompatibiliti wantaim ol hai molekiul polima. Sapos i gat tupela haidroksil grup long orto posisen bilong kabonil grup, em inap kisim ol altravailet re bilong 300-400 fm, na tu inap kisim hap bilong lait yu inap lukim. Bikos long absorpsen bilong lait yu inap lukim, lait bilong komplimentari i no balens, na ol atikol i bungim dispela UV absoba i luk yelo. Kompatibiliti wantaim ol hai molekiul polima tu i no gutpela, olsem na aplikesen rein bilong en i liklik. Nomata we benzophenone we i no gat o-haedroksil grup tu i gat paoa blong tekem ol ultraviolet rei, bae i mekem se i no strong tumas taem hem i stap long laet, mekem se i no stret blong yusum olsem ol samting blong pulum ol ultraviolet.
2. Salilet
Ol i save kisim ol marasin bilong pulim win long UV, em ol namba wan samting ol i mas yusim, na ol salisilet tu i gat ol intrinsik haidrojen bon insait long molekiul. Dispela kain ultraviolet absoba i gat liklik tru inap long kisim ol altravailet re long stat, na absorpsen rein i liklik tru (i no winim 340vm), tasol bihain long wanpela taim bilong altraviolet iradiesen, absorpsen bilong em i go antap isi isi inap long maksimum absorpsen veliu bilong absorpsen. , na kamapim wanpela bensofeneone straksa i gat strongpela ultravailet absorpsen inap, na long dispela rot em i strongim ultraviolet absorpsen bilong en. Olsem na ol i kolim Painia UV Absorber. Bihain long dihaidroxybenzophenone na ol samting i kam long en, ol inap kisim gen ol molekiul, ol inap kisim hap bilong lait ol i ken lukim na ol inap kamap yelo, na dispela inap mekim na ol samting i kamap yelo na ol i putim wantaim dispela ultraviolet absoba.
3. Benzotriazole
Mekanisme bilong wok bilong ol benzotriazole ultraviolet absoba i wankain olsem bilong benzophenone. Lait yu inap lukim antap long ol mita, olsem na bai ol i no inap kalarim dispela samting;
4. Ol akrilonitrile na triasin i kamap.
In addition, the substituted acrylonitrile and triazine ultraviolet absorbers, according to the mechanism of action, are also cis-trans isomerization, so that the energy of light is converted into harmless energy and released, and the ultraviolet absorbers substituted by acrylonitrile can absorb 290-320 fm Ultraviolet light, does not absorb visible lait, na bai i no inap mekim aplikesen i tait, na ultraviolet absoba inap kisim kromojenik jin na kromojenik grup wantaim wanpela wevlength aninit long 400-M, we olgeta i konek long aromatik kor.
5. Ol narapela klas
Oganikel i save yusum tu olsem wan UV absorber, be oli jenerol klasem olsem wan quencher, we i gat wan abiliti we i daon moa blong absorbem UV laet bitim hemia bifo, be i blokem disosiasen blong polima raon long absorbem UV laet. Ogenikel polima i save wok wantaim ol molekiul insait long polima we i amamas long eksait stet aninit long altraviolet lait iradiesen, olsem na eksait stet i go bek long eksait stet. Long graun stet, ol i tanim ultraviolet eneji i kamap wanpela low-energi spektrum na i no bagarapim em. Blong protektem polima blong i no spolem, oli singaotem wan quencher from se mekanisme blong aksen blong hem i defren long hemia blong ol jenerol UV absorba. UV absobba i senisim molekiul straksa bilong ol, na ol quenchers i save rausim eneji tasol long rot bilong intamolekyula eneji trensfe.
Antap long dispela, kabon blakpela, titanium daioksait, zinc oksait, zinc barium na ol narapela marasin bilong pasim san tu em i wanpela klas bilong ol samting inap kisim o soim ol ultraviolet rei. Wanpela bloking leit i stap namel long polima na lait sos bilong kisim o soim ol ultraviolet rei. Taim em i kamap long ples bilong polima, Absorbed na reflektim, i pasim UV lait long go insait long insait bilong polima, wantaim kabon blak i gutpela tru. Ol fri radikel skavenja em i wanpela klas bilong ol samting tu we inap kamapim lait stebilisesen, na ol i save kisim ol samting i kam long piridine wantaim sterik hindrans ifek, ol i kolim olsem ol amine lait stabilisa i pasim.
