Selelekela

Li-antioxidant (kapa li-heat stabilizers) ke lintho tse sebelisoang ho thibela kapa ho liehisa ho senyeha ha li-polymer ka lebaka la oksijene kapa ozone sepakapakeng. Ke lintho tse sebelisoang haholo linthong tsa polymer. Liaparo li tla senyeha ka lebaka la ho besoa mochesong o phahameng kapa ho pepesetsoa khanya ea letsatsi. Lintho tse kang ho tsofala le ho ba mosehla li tla ama ponahalo le ts'ebetso ea sehlahisoa ka botebo. E le ho thibela kapa ho fokotsa ho etsahala ha mokhoa ona, hangata li-antioxidants lia eketsoa.

Ho senyeha ha oxidation ea mocheso oa li-polymer ho bakoa haholo-holo ke karabelo ea free radical ea mofuta oa ketane e qalisoang ke free radicals e hlahisoang ke hydroperoxides ha e futhumatsoa. ​​Ho senyeha ha oxidation ea mocheso oa li-polymers ho ka thibeloa ke ho tšoaroa ha free radical le ho bola ha hydroperoxide, joalo ka ha ho bontšitsoe setšoantšong se ka tlase. Har'a tsona, li-antioxidants li ka thibela oxidation e kaholimo 'me ka hona li sebelisoa haholo.

Mefuta ea li-antioxidants

Li-antioxidantsli ka aroloa ka mekhahlelo e meraro ho latela mesebetsi ea tsona (ke hore, ho kenella ha tsona ts'ebetsong ea lik'hemik'hale tsa oksideishene ea auto-oxidation):

li-antioxidants tse felisang ketane: haholo-holo li hapa kapa li tlosa li-free radical tse hlahisoang ke polymer auto-oxidation;

li-antioxidants tse bolisang hydroperoxide: haholo-holo li khothalletsa ho bola ho sa fetoheng ha hydroperoxides ka har'a li-polymer;

li-antioxidants tse fetolang moea: li ka etsa li-chelate tse tsitsitseng tse nang le li-ion tse kotsi tsa tšepe, ka hona li fetola phello ea catalytic ea li-ion tsa tšepe ts'ebetsong ea oxidation ea li-polymers ka boiketsetso.

Har'a mefuta e meraro ea li-antioxidants, li-antioxidants tse felisang ketane li bitsoa li-antioxidants tsa mantlha, haholo-holo li-phenol tse sitisoang le li-aromatics tsa bobeli; mefuta e meng e 'meli e bitsoa li-antioxidants tse thusang, ho kenyeletsoa li-phosphite le letsoai la tšepe la dithiocarbamate. E le ho fumana sekoahelo se tsitsitseng se fihlelang litlhoko tsa ts'ebeliso, hangata ho khethoa motsoako oa li-antioxidants tse ngata.

Tšebeliso ea li-antioxidants ho lipente

1. E sebelisoa ho alkyd, polyester, polyester e sa koaheloang
Likarolong tse nang le oli tsa alkyd, ho na le litlamo tse habeli ho isa maemong a fapaneng. Litlamo tse habeli tse le 'ngoe, litlamo tse peli tse ngata, le litlamo tse peli tse kopantsoeng li oxidized habonolo ho etsa li-peroxide mochesong o phahameng, e leng se etsang hore 'mala o be lefifi, ha li-antioxidants li ka bolisa hydroperoxides ho fokotsa 'mala.

2. E sebelisoa ho kopanyeng moemeli oa ho folisa oa PU
Sehlahisoa sa ho phekola sa PU hangata se bolela prepolymer ea trimethylolpropane (TMP) le toluene diisocyanate (TDI). Ha resin e pepesetsoa mocheso le khanya nakong ea tlhahiso, urethane e bola ho ba li-amine le li-olefin ebe e roba ketane. Haeba amine e le monko o monate, e oxidized ho ba quinone chromophore.

3. Tšebeliso ho lipente tsa phofo tse koahelang thermosetting
Ke antioxidant e tsoakiloeng ea phosphite e sebetsang hantle haholo le li-antioxidants tsa phenolic, e loketseng ho sireletsa lipeo tsa phofo ho tsoa ho ho senyeha ha oxidative ea mocheso nakong ea ts'ebetso, pheko, ho chesa haholo le lits'ebetso tse ling. Lisebelisoa li kenyelletsa polyester epoxy, blocked isocyanate TGIC, TGIC substitutes, linear epoxy compounds le thermosetting acrylic resins.

Lisebelisoa tse Ncha tsa Nanjing Reborn li fana ka mefuta e fapaneng eali-antioxidantbakeng sa indasteri ea polasetiki, ea ho roala, ea rabara.

Ka boqapi le tsoelo-pele ea indasteri ea ho roala, bohlokoa ba li-antioxidants bakeng sa ho roala bo tla totobala haholoanyane, 'me sebaka sa nts'etsopele se tla ba se pharaletseng. Nakong e tlang, li-antioxidants li tla hola ka lehlakoreng la boima bo phahameng ba limolek'hule, ts'ebetso e mengata, bokhoni bo phahameng, bocha, ho kopana, karabelo le ts'ireletso ea tikoloho e tala. Sena se hloka hore litsebi li etse lipatlisiso tse tebileng ho tsoa likarolong tsa mokhoa le ts'ebeliso ho li ntlafatsa khafetsa, li etse lipatlisiso tse tebileng mabapi le litšobotsi tsa sebopeho sa li-antioxidants, le ho nts'etsapele li-antioxidants tse ncha le tse sebetsang ho latela sena, tse tla ba le tšusumetso e kholo ts'ebetsong le ts'ebelisong ea indasteri ea ho roala. Li-antioxidants bakeng sa ho roala li tla sebelisa bokhoni ba tsona bo boholo haholoanyane 'me li tlise melemo e metle ea moruo le ea theknoloji.