Ukuqaliswa kwe-UV absorber
Ukukhanya kwelanga kuqulethe ukukhanya okuninzi kwe-ultraviolet okuyingozi kwizinto ezinemibala. Ubude bayo bumalunga ne-290 ~ 460nm. Le mitha ye-ultraviolet inobungozi ibangela ukuba iimolekyuli zombala zibole kwaye ziphele ngenxa yeekhemikhali zokunciphisa i-oxidation-reduction reactions. Ukusetyenziswa kwe-absorber ultraviolet kunokuthintela ngokufanelekileyo okanye ukunciphisa umonakalo wemitha ye-ultraviolet kwizinto ezikhuselweyo.
I-Absorbent ye-UV sisizinzi sokukhanya esinokufunxa inxalenye ye-ultraviolet yokukhanya kwelanga kunye nemithombo yokukhanya ye-fluorescent ngaphandle kokuzitshintsha. Iiplastiki kunye nezinye izinto ze-polymer zivelisa ukuphendula kwe-auto-oxidation phantsi kokukhanya kwelanga kunye ne-fluorescence ngenxa yesenzo semisebe ye-ultraviolet, ekhokelela ekuthotyweni kunye nokuwohloka kwe-polymers, kunye nokuwohloka kokubonakala kunye neempawu zomatshini. Emva kokongeza i-Absorbers ye-UV, oku kukhanya kwe-ultraviolet kunamandla aphezulu kunokuthatyathwa ngokukhethiweyo, ukujike kube ngamandla angenabungozi kwaye kukhutshwe okanye kusetyenziswe. Ngenxa yeentlobo ezahlukeneyo zeepolymers, amaza amaza emitha ye-ultraviolet ebangela ukuba ibe mandundu nawo ahlukile. Iintlobo ezahlukeneyo zokufunxa kwe-UV zinokufunxa imitha ye-ultraviolet yobude bamaza ahlukeneyo. Xa usebenzisa, i-Absorbers ye-UV kufuneka ikhethwe ngokohlobo lwepolymer.
Iintlobo ze-Absorption ye-UV
Iindidi eziqhelekileyo zokufunxa kwe-UV ziquka: i-benzotriazole (efana neIsibambisi seUV 327), benzophenone(ezifana neIsithambiso se-UV 531), i-triazine(efana neIsibambisi seUV 1164), kwaye yathintela i-amine(efana neIsizinzisi sokukhanya 622).
I-Benzotriazole UV absorbers ngoku zezona zisetyenziswa kakhulu ezahlukeneyo e-China, kodwa umphumo wokusetyenziswa kwe-Absorption ye-UV ye-triazine ingcono kakhulu kune-benzotriazole. I-Absorption ye-Triazine ineempawu ezibalaseleyo zokufunxa i-UV kunye nezinye iingenelo. Zingasetyenziswa ngokubanzi kwiipolymers, zinozinzo oluhle kakhulu lwe-thermal, uzinzo oluhle lokucubungula, kunye nokumelana ne-asidi. Kwizicelo ezisebenzayo, i-triazine i-UV absorbers inesiphumo esihle se-synergistic kunye nezithinteli zokukhanya kwe-amine ezithintelweyo. Xa ezi zimbini zisetyenziswa kunye, zineziphumo ezingcono kunokuba zisetyenziswe zodwa.
Uninzi lwezixhobo zokufunxa zeUV eziqhelekileyo zibonwa
(1)UV-531
Umgubo okhanyayo otyheli okanye omhlophe wekristale. Uxinzelelo 1.160g/cm³ (25℃). Indawo yokunyibilika 48~49℃. Inyibilika kwi-acetone, benzene, ethanol, isopropanol, inyibilika kancinane kwidichloroethane, ayinyibiliki emanzini. Ukunyibilika kwezinye izinyibilikisi (g/100g, 25℃) yiacetone 74, benzene 72, methanol 2, ethanol (95%) 2.6, n-heptane 40, n-hexane 40.1, amanzi 0.5. Njengesixhobo sokufunxa i-UV, inokufunxa ngamandla ukukhanya kwe-ultraviolet kunye nobude obungamaza angama-270 ~ 330nm. Ingasetyenziswa kwiiplastiki ezahlukeneyo, ngakumbi i-polyethylene, i-polypropylene, i-polystyrene, i-resin ye-ABS, i-polycarbonate, i-polyvinyl chloride. Inokuhambelana kakuhle kunye ne-resin kunye nokuguquguquka okuphantsi. Idosi eqhelekileyo yi-0.1% ~ 1%. Inomphumela omhle we-synergistic xa isetyenziswe kunye nenani elincinci le-4,4-thiobis (6-tert-butyl-p-cresol). Le mveliso ingasetyenziselwa njengesizinziso sokukhanya kwiingubo ezahlukeneyo.
(2)UV-327
Njenge-Absorption ye-UV, iimpawu zayo kunye nokusetyenziswa kwayo kufana ne-benzotriazole UV-326. Iyakwazi ukufunxa ngamandla imitha ye-ultraviolet kunye ne-wavelength ye-270 ~ 380nm, inozinzo olufanelekileyo lweekhemikhali kunye nokuguquguquka okuphantsi kakhulu. Inokuhambelana kakuhle kunye neepololefins. Ngokukodwa ifanelekile i-polyethylene kunye ne-polypropylene. Ukongeza, ingasetyenziselwa i-polyvinyl chloride, i-polymethyl methacrylate, i-polyoxymethylene, i-polyurethane, i-polyester engaxutywanga, i-resin ye-ABS, i-epoxy resin, i-cellulose resin, njl. Inempembelelo ebalulekileyo ye-synergistic xa isetyenziswe ngokudibeneyo ne-antioxidants. Isetyenziselwa ukuphucula ukuzinza kwe-thermal oxidation yemveliso.
(3)UV-9
Umgubo okhanyayo otyheli okanye omhlophe wekristale. Uxinzelelo 1.324g/cm³. Indawo yokunyibilika 62~66℃. Indawo yokubilisa 150 ~ 160℃ (0.67kPa), 220℃ (2.4kPa). Inyibilika kwiintlobo ezininzi ze-organic solvents ezifana ne-acetone, i-ketone, i-benzene, i-methanol, i-ethyl acetate, i-methyl ethyl ketone, i-ethanol, kodwa ayinyibiliki emanzini. Ukunyibilika kwezinye izinyibilikisi (g/100g, 25℃) yi-solvent benzene 56.2, n-hexane 4.3, ethanol (95%) 5.8, carbon tetrachloride 34.5, styrene 51.2, DOP 18.7. Njenge-Absorption ye-UV, ifanelekile kwiindidi zeplastiki ezifana ne-polyvinyl chloride, i-polyvinylidene chloride, i-polymethyl methacrylate, i-polyester engaxutywanga, i-resin ye-ABS, i-cellulose resin, njl. Inozinzo oluhle lwe-thermal kwaye ayiboli kwi-200 ℃. Le mveliso ayifunxanga ukukhanya okubonakalayo, ngoko ke ifanelekile kwiimveliso ezikhanyayo ezinombala okhanyayo. Le mveliso ingasetyenziselwa iipeyinti kunye nerubha yokwenziwa.
Ixesha lokuposa: May-09-2025