Selelekela
Li-antioxidants (kapa li-stabilizers tsa mocheso) ke li-additives tse sebelisetsoang ho thibela kapa ho liehisa ho senyeha ha li-polymer ka lebaka la oksijene kapa ozone sepakapakeng. Ke li-additives tse sebelisoang ka ho fetisisa linthong tsa polymer. Liaparo li tla senyeha ka mor'a hore li behiloe ka mocheso o phahameng kapa li pepesehe letsatsing. Liphenomena tse kang botsofali le mosehla li tla ama ka ho teba ponahalo le ts'ebetso ea sehlahisoa. Bakeng sa ho thibela kapa ho fokotsa ho hlaha ha mokhoa ona, hangata li-antioxidants lia eketsoa.
Thermal oxidation degradation of polymers e bakoa haholo-holo ke mofuta oa ketane ea mahala ea radical reaction e qalileng ke li-radicals tsa mahala tse hlahisoang ke hydroperoxides ha li futhumala. Thermal oxidation degradation ea li-polymers e ka sitisoa ke ho ts'oaroa ha radical mahala le ho bola ha hydroperoxide, joalo ka ha ho bonts'itsoe setšoantšong se ka tlase. Har'a tsona, li-antioxidants li ka thibela oxidation e ka holimo 'me ka hona li sebelisoa haholo.
Mefuta ea li-antioxidants
Antioxidantse ka aroloa ka mekhahlelo e meraro ho latela mesebetsi ea bona (ke hore, ho kenella ha bona ts'ebetsong ea lik'hemik'hale tsa auto-oxidation):
ketane e felisang li-antioxidants: li hapa kapa li tlosa li-radicals tsa mahala tse hlahisoang ke polymer auto-oxidation;
hydroperoxide decomposing antioxidants: haholo-holo e khothaletsa ho bola ha hydroperoxide ka har'a li-polymers;
Metal ion passivating antioxidants: ba ka etsa li-chelate tse tsitsitseng tse nang le li-ion tse kotsi tsa tšepe, ka hona li fetisa phello e matla ea li-ion tsa tšepe ts'ebetsong ea auto-oxidation ea li-polymers.
Har'a mefuta e meraro ea li-antioxidant, li-antioxidant tse felisang ketane li bitsoa li-antioxidant tsa mantlha, haholo-holo li-phenols tse sitisang le li-amine tse nkhang hamonate; mefuta e meng e 'meli e bitsoa li-antioxidant tse thusang, tse kenyelletsang phosphites le letsoai la tšepe la dithiocarbamate. E le ho fumana seaparo se tsitsitseng se finyellang litlhoko tsa kopo, hangata ho khethoa motsoako oa li-antioxidants tse ngata.
Tšebeliso ea li-antioxidants ho li-coatings
1. E sebelisoa ka alkyd, polyester, unsaturated polyester
Likarolong tse nang le oli tsa alkyd, ho na le litlamo tse peli tse fapaneng ho isa ho tse fapaneng. Li-bond tse peli tse le 'ngoe, li-bond tse peli tse kopantsoeng, le li-conjugated double bond li kenngoa habonolo ho etsa peroxides ka mocheso o phahameng, ho etsa hore' mala o be lefifi, ha li-antioxidants li ka senya hydroperoxides ho khantša 'mala.
2. E sebelisoa ha ho etsoa motsoako oa PU ho phekola
PU e phekolang ka kakaretso e bolela prepolymer ea trimethylolpropane (TMP) le toluene diisocyanate (TDI). Ha resin e pepesehetse mocheso le khanya nakong ea ho kopanya, urethane e senyeha ho ba li-amine le li-olefin ebe e roba ketane. Haeba amine e le monko o monate, e na le oxidized ho fetoha quinone chromophore.
3. Kopo ka liphahlo tsa phofo ea thermosetting
Antioxidant e tsoakiloeng ea phosphite e nang le ts'ebetso e phahameng ea phosphite le phenolic antioxidants, e loketseng ho sireletsa liphahlo tsa phofo ho senyeha ha mocheso oa oxidative nakong ea ts'ebetso, ho phekola, ho chesa le mekhoa e meng. Likopo li kenyelletsa polyester epoxy, TGIC e koetsoeng ea isocyanate, li-substitutes tsa TGIC, li-linear epoxy compounds le thermosetting acrylic resin.
Nanjing Reborn New Materials e fana ka mefuta e fapaneng eali-antioxidantsbakeng sa liindasteri tsa polasetiki, tsa ho roala, tsa rabara.
Ka boqapi le tsoelo-pele ea indasteri ea ho roala, bohlokoa ba li-antioxidants bakeng sa ho roala bo tla bonahala haholoanyane, 'me sebaka sa nts'etsopele se tla ba se pharaletseng. Nakong e tlang, li-antioxidants li tla nts'etsapele ka lehlakoreng la boima bo phahameng ba limolek'hule, ts'ebetso e mengata, ts'ebetso e phahameng, bocha, compositeness, karabelo le ts'ireletso ea tikoloho e tala. Sena se hloka hore lingaka li etse lipatlisiso tse tebileng ho tsoa mecheng le lits'ebetsong ho li ntlafatsa khafetsa, ho etsa lipatlisiso tse tebileng mabapi le sebopeho sa li-antioxidants, le ho nts'etsapele li-antioxidants tse ncha tse sebetsang hantle tse ipapisitseng le sena, tse tla ba le phello e kholo ts'ebetsong le ts'ebelisong ea indasteri ea li-coatings. Li-antioxidants bakeng sa ho roala li tla eketsa matla a tsona a maholo 'me li tlise melemo e babatsehang ea moruo le thekenoloji.
Nako ea poso: Apr-30-2025