Isingeniso se-UV absorber

Ukukhanya kwelanga kuqukethe ukukhanya okuningi kwe-ultraviolet okulimaza izinto ezinombala. Ubude bayo obude bungama-290 ~ 460nm. Le misebe ye-ultraviolet elimazayo ibangela ukuthi ama-molecule ombala abole futhi anyamalale ngenxa yokusabela kokunciphisa ukushiswa kwe-oxidation ngamakhemikhali. Ukusetshenziswa kwezithako ze-ultraviolet kungavimbela noma kunciphise umonakalo wemisebe ye-ultraviolet ezintweni ezivikelwe.

Isithambisi se-UV siyisithambisi sokukhanya esingamunca ingxenye ye-ultraviolet yelanga kanye nemithombo yokukhanya ye-fluorescent ngaphandle kokushintsha sona. Amapulasitiki nezinye izinto ze-polymer zikhiqiza ukusabela kwe-auto-oxidation ngaphansi kokukhanya kwelanga kanye ne-fluorescence ngenxa yesenzo semisebe ye-ultraviolet, okuholela ekuwohlokeni nasekuwohlokeni kwama-polymer, kanye nokuwohloka kokubukeka kanye nezakhiwo zemishini. Ngemva kokwengeza izithambisi ze-UV, lokhu kukhanya kwe-ultraviolet okunamandla aphezulu kungamuncwa ngokukhetha, kuguqulwe kube amandla angenangozi bese kukhishwa noma kudliwe. Ngenxa yezinhlobo ezahlukene zama-polymer, ubude bama-wave bemisebe ye-ultraviolet ebangela ukuthi yonakale nakho kuhlukile. Izithambisi ze-UV ezahlukene zingamunca imisebe ye-ultraviolet yama-wave ahlukene. Uma kusetshenziswa, izithambisi ze-UV kufanele zikhethwe ngokohlobo lwe-polymer.

Izinhlobo ze-UV absorber

Izinhlobo ezivamile zezifutho ze-UV zifaka: i-benzotriazole (njenge-Isifutho se-UV 327), i-benzophenone (njengeIsifutho se-UV 531), i-triazine (njenge-Isifutho se-UV 1164), kanye ne-amine evinjiwe (njenge-Isiqinisi Sokukhanya 622).

Izifutho ze-UV ze-Benzotriazole okwamanje ziyizinhlobo ezisetshenziswa kakhulu eShayina, kodwa umphumela wokusetshenziswa kwezifutho ze-UV ze-triazine ungcono kakhulu kunowe-benzotriazole. Izifutho ze-Triazine zinezakhiwo ezinhle kakhulu zokumunca i-UV kanye nezinye izinzuzo. Zingasetshenziswa kabanzi kuma-polymer, zinokuqina okuhle kokushisa, ukuqina okuhle kokucubungula, kanye nokumelana ne-asidi. Ezisetshenzisweni ezisebenzayo, izifutho ze-UV ze-triazine zinomphumela omuhle wokubambisana neziqinisi zokukhanya kwe-amine ezivinjiwe. Uma lezi ezimbili zisetshenziswa ndawonye, ​​​​zinemiphumela engcono kunalapho zisetshenziswa zodwa.

Izithasiselo eziningana ze-UV ezivame ukubonakala

(1)I-UV-531
Impuphu ephuzi noma emhlophe ekristalu. Ubuningi 1.160g/cm³ (25℃). Iphuzu lokuncibilika 48~49℃. Incibilika ku-acetone, i-benzene, i-ethanol, i-isopropanol, incibilika kancane ku-dichloroethane, ayincibiliki emanzini. Ukuncibilika kwezinye izinyibilikisi (g/100g, 25℃) yi-acetone 74, i-benzene 72, i-methanol 2, i-ethanol (95%) 2.6, i-n-heptane 40, i-n-hexane 40.1, amanzi 0.5. Njenge-UV absorber, ingamunca kakhulu ukukhanya kwe-ultraviolet ngobude be-wavelength obungu-270~330nm. Ingasetshenziswa kumapulasitiki ahlukahlukene, ikakhulukazi i-polyethylene, i-polypropylene, i-polystyrene, i-ABS resin, i-polycarbonate, i-polyvinyl chloride. Ihambisana kahle nama-resin kanye nokuguquguquka okuphansi. Umthamo ojwayelekile ungu-0.1%~1%. Inomphumela omuhle wokubambisana uma isetshenziswa nenani elincane le-4,4-thiobis(6-tert-butyl-p-cresol). Lo mkhiqizo ungasetshenziswa futhi njengesiqinisi sokukhanya kwezingubo ezahlukahlukene.

(2)I-UV-327
Njenge-UV absorber, izici zayo kanye nokusetshenziswa kwayo kufana nokwe-benzotriazole UV-326. Ingamunca kakhulu imisebe ye-ultraviolet enobude be-wavelength obungu-270 ~ 380nm, izinzile kahle ngamakhemikhali futhi iguquguqukayo kakhulu. Ihambisana kahle nama-polyolefin. Ifaneleka kakhulu i-polyethylene ne-polypropylene. Ngaphezu kwalokho, ingasetshenziswa futhi kwi-polyvinyl chloride, i-polymethyl methacrylate, i-polyoxymethylene, i-polyurethane, i-unsaturated polyester, i-ABS resin, i-epoxy resin, i-cellulose resin, njll. Lo mkhiqizo unokumelana okuhle kakhulu nokushisa, ukumelana nokuwasha, ukumelana nokufiphala kwegesi kanye nokugcinwa kwempahla yemishini. Inomphumela obalulekile wokubambisana uma isetshenziswa kanye nama-antioxidants. Isetshenziselwa ukuthuthukisa ukuzinza kwe-thermal oxidation yomkhiqizo.

(3)I-UV-9
Impuphu ephuzi noma emhlophe ekristalu. Ubuningi 1.324g/cm³. Iphuzu lokuncibilika 62~66℃. Iphuzu lokubila 150~160℃ (0.67kPa), 220℃ (2.4kPa). Incibilika ezincibilikisini eziningi eziphilayo ezifana ne-acetone, i-ketone, i-benzene, i-methanol, i-ethyl acetate, i-methyl ethyl ketone, i-ethanol, kodwa ayincibiliki emanzini. Ukuncibilika kwezinye izincibilikisi (g/100g, 25℃) yi-solvent benzene 56.2, n-hexane 4.3, i-ethanol (95%) 5.8, i-carbon tetrachloride 34.5, i-styrene 51.2, i-DOP 18.7. Njenge-UV absorber, ifaneleka ezinhlobonhlobo zepulasitiki ezifana ne-polyvinyl chloride, i-polyvinylidene chloride, i-polymethyl methacrylate, i-unsaturated polyester, i-ABS resin, i-cellulose resin, njll. Ububanzi obukhulu bokumunca bungu-280 ~ 340nm, kanti umthamo ojwayelekile ungu-0.1% ~ 1.5%. Iqinile ekushiseni futhi ayiboli ku-200℃. Lo mkhiqizo awumunci ukukhanya okubonakalayo, ngakho-ke ufaneleka emikhiqizweni ekhanyayo ekhanyayo. Lo mkhiqizo ungasetshenziswa futhi kupende kanye nerabha yokwenziwa.