Kenyelletso ea sesebelisoa sa UV

Khanya ea letsatsi e na le khanya e ngata ea ultraviolet e kotsi linthong tse mebala. Bophahamo ba eona bo ka ba 290 ~ 460nm. Mahlaseli ana a kotsi a ultraviolet a etsa hore limolek'hule tsa 'mala li bole 'me li nyamele ka lebaka la karabelo ea ho fokotsa k'hemik'hale. Tšebeliso ea li-absorber tsa ultraviolet e ka thibela kapa ea fokolisa ka katleho tšenyo ea mahlaseli a ultraviolet ho lintho tse sirelelitsoeng.

UV absorber ke stabilizer e khanyang e khonang ho monya karolo ea ultraviolet ea mahlaseli a letsatsi le mehloli ea leseli la fluorescent ntle le ho fetoha. Plastiki le lisebelisoa tse ling tsa polymer li hlahisa li-auto-oxidation reaction tlas'a khanya ea letsatsi le fluorescence ka lebaka la ketso ea mahlaseli a ultraviolet, e lebisang ho senyeha le ho senyeha ha li-polymers, le ho senyeha ha ponahalo le thepa ea mochine. Kamora ho eketsa li-absorber tsa UV, leseli lena le nang le matla a phahameng a ultraviolet le ka monngoa ka mokhoa o ikhethileng, la le fetola matla a se nang kotsi ebe le lokolloa kapa la chesoa. Ka lebaka la mefuta e fapaneng ea li-polymers, bolelele ba maqhubu a mahlaseli a ultraviolet a etsang hore a senyehe le bona bo fapane. Li-absorber tse fapaneng tsa UV li ka monya mahlaseli a ultraviolet a bolelele bo fapaneng ba maqhubu. Ha u sebelisa, li-absorber tsa UV li lokela ho khethoa ho latela mofuta oa polymer.

Mefuta ea li-absorber tsa UV

Mefuta e tloaelehileng ea li-absorber tsa UV e kenyelletsa: benzotriazole(joalo kaSesebelisoa sa UV 327), benzophenone(joalokaSesebelisoa sa UV 531), triazine(joalokaSesebelisoa sa UV 1164), mme a sitisa amine(jwalo kaLeseli Stabilizer 622).

Li-absorer tsa Benzotriazole UV ha joale ke mefuta e sebelisoang ka ho fetisisa Chaena, empa phello ea ts'ebeliso ea li-absorer tsa UV tsa triazine e molemo haholo ho feta ea benzotriazole. Li-absorption tsa Triazine li na le thepa e ntle ea ho monya UV le melemo e meng. Li ka sebelisoa haholo ho li-polymers, li na le botsitso bo botle ba mocheso, botsitso bo botle ba ts'ebetso, le ho hanyetsa acid. Lits'ebetsong tse sebetsang, li-absorber tsa UV tsa triazine li na le phello e ntle ea synergistic le li-stabilizer tse sitisang khanya ea amine. Ha tse peli li sebelisoa hammoho, li na le liphello tse molemo ho feta ha li sebelisoa li le mong.

Li-absorber tse ngata tse bonoang hangata tsa UV

(1)UV-531
Phofo e khanyang e mosehla kapa e tšoeu ea kristale. Boima ba 1.160g/cm³ (25℃). Sebaka se qhibilihang ke 48 ~ 49 ℃. E qhibiliha ka har'a acetone, benzene, ethanol, isopropanol, e qhibilihang hanyenyane ka dichloroethane, 'me ha e qhibilihe metsing. Sollubility ho tse ling tse hlapollang (g/100g, 25℃) ke acetone 74, benzene 72, methanol 2, ethanol (95%) 2.6, n-heptane 40, n-hexane 40.1, metsi 0.5. Joalo ka sehanyi sa UV, se ka monya khanya ea ultraviolet ka matla ka bolelele ba 270 ~ 330nm. E ka sebelisoa ka polasetiki tse fapa-fapaneng, haholo-holo polyethylene, polypropylene, polystyrene, ABS resin, polycarbonate, polyvinyl chloride. E na le tumellano e ntle le li-resin le volatility e tlase. Tekanyetso e akaretsang ke 0.1% ~ 1%. E na le phello e ntle ea synergistic ha e sebelisoa ka tekanyo e nyenyane ea 4,4-thiobis (6-tert-butyl-p-cresol). Sehlahisoa sena se ka boela sa sebelisoa e le stabilizer e khanyang bakeng sa liphahlo tse fapaneng.

(2)UV-327
Joalo ka sehanyi sa UV, litšobotsi le ts'ebeliso ea eona li tšoana le tsa benzotriazole UV-326. E ka monya mahlaseli a ultraviolet ka matla a bolelele ba 270 ~ 380nm, e na le botsitso bo botle ba lik'hemik'hale le ho hloka botsitso ho tlase haholo. E na le tumellano e ntle le polyolefin. Haholo-holo e loketse polyethylene le polypropylene. Ho phaella moo, e ka boela ea sebelisoa bakeng sa polyvinyl chloride, polymethyl methacrylate, polyoxymethylene, polyurethane, polyester unsaturated, ABS resin, epoxy resin, cellulose resin, joalo-joalo Sehlahisoa sena se na le khanyetso e babatsehang ea mocheso oa mocheso, ho hanyetsa ho hlatsoa, ​​ho hanyetsa khase le ho boloka thepa ea mechine. E na le phello e kholo ea synergistic ha e sebelisoa hammoho le li-antioxidants. E sebelisetsoa ho ntlafatsa botsitso ba oxidation ea mocheso oa sehlahisoa.

(3)UV-9
Phofo e khanyang e mosehla kapa e tšoeu ea kristale. Boima ba 1.324g/cm³. Sebaka se qhibilihang ke 62 ~ 66 ℃. Ntho e belang 150 ~ 160 ℃ (0.67kPa), 220 ℃ (2.4kPa). E qhibiliha ka har'a metsoako e mengata ea tlhaho e kang acetone, ketone, benzene, methanol, ethyl acetate, methyl ethyl ketone, ethanol, empa e sa qhibilihe ka metsing. Sollubility ho tse ling tse hlapollang (g/100g, 25℃) ke solvent benzene 56.2, n-hexane 4.3, ethanol (95%) 5.8, carbon tetrachloride 34.5, styrene 51.2, DOP 18.7. E le UV absorber, e loketse mefuta e fapaneng ya dipolasetiki tse kang polyvinyl chloride, polyvinylidene chloride, polymethyl methacrylate, unsaturated polyester, ABS resin, cellulose resin, joalo-joalo The absorption wavelength palo e kahodimodimo ke 280 ~ 340nm, 'me tekanyo ea kakaretso ke 1.5%. E na le botsitso bo botle ba mocheso mme ha e bole ho 200 ℃. Sehlahisoa sena ha se monye leseli le bonahalang, kahoo se loketse lihlahisoa tse bonaletsang tsa 'mala o bobebe. Sehlahisoa sena se ka boela sa sebelisoa ka lipente le rabara ea maiketsetso.