Indlela ehlanganisiwe kanye nokwakhiwa kwemiklamo yama-antioxidants asemqoka nasekushubile ngokuguga kwe-anrmal axygen

Indlela ehlanganisiwe kanye nokwakhiwa kwemiklamo yama-antioxidants asemqoka nasekushubile ngokuguga kwe-anrmal axygen

Ukuguga kwe-anti-thermal kwe-polymer kufinyelelwa ngokungeza ama-antioxidants, okungahlukaniswa ngezinhlobo ezimbili zama-antioxidants nama-antioxidants asetshenzisiwe ngokwenhlanganisela, okunomphumela wokugula okungcono kakhulu futhi kudlala umthelela ophefumulayo we-anti-thermal futhi udlala umthelela ongcono we-anti-thermal

• Indlela yokwenza kwezenzo zama-antioxidants aphambili

I-antioxidant eyinhloko ingasabela ngama-radicals amahhala · no roo ·, bamba futhi isuse ama-hydroperoxides, aphazamise ukukhula kwama-hydroperoch, asuse ama-radicals wamahhala akhiqizwa yi-resin ngaphansi kwamazinga okushisa aphezulu, ukushisa nezimo zokukhanya, futhi athole inhloso yokuvikela i-polymer. Imodi ethile yesenzo injengokulandelayo:

Abanikeli be-Hydrogen, ama-aryriline wesibili futhi abavimbela ama-antioxidants we-phenolic aqukethe -oh, = amaqembu e-NH, anganikeza ama-athomu ama-hydrogen kuma-radicals wamahhala, ngakho-ke ama-radicals asebenzayo akhiqiza ama-radicals aqinile noma ama-hydroperoch.

Izicupho zamahhala ezi-radical, ze-benzoquequinone antioxidants ziphendule ngama-radicals wamahhala ukwakha ama-radicals wamahhala.

Umnikeli we-elektroniki, ama-antioxidants aphezulu a-Antioxidants ahlinzeka ngama-elektroni azosebenza ngokuphendula ama-radicals, abenze abenze imisebenzi ephansi ephansi, ukuqeda ukusabela kwe-auto-oxidation.

Ama-antioxidants aphambili angasetshenziswa yedwa, kepha asebenze kangcono ngama-antioxidants aphezulu.

• Indlela yokwenza kwe-antioxidants ezayo

Ama-antioxidants asizayo angadumisa ama-hydroperouteides akhiqizwe yi-antioxidant eyinhloko esenomsebenzi othile, ukuze angaqalisi kabusha ukusabela kwe-oxidation okuzenzakalelayo.

Ngaphezu kwalokho, ama-antioxidants asizayo angavimbela futhi ambezele ukwakheka kwama-radicals wamahhala ngesikhathi senqubo yokuqalisa, futhi aqhamuke nama-inter stus asele ku-polymer. Ama-antioxidants asizayo afana nama-phosphite esters kanye nama-organic sulfides ama-hydroperoxuoxide agents ejenti.

• Ukukhetha ama-antioxidants

Kunezinhlobonhlobo eziningi zama-antioxidants, futhi amaphuzu alandelayo kufanele anake lapho ekhetha.

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. Kodwa-ke, izoshintsha umbala ngesikhathi sokucutshungulwa futhi ingcolise umkhiqizo, futhi ubuthi bukhulu, ngakho-ke akudingekile kusetshenziswe emikhiqizweni ye-polymer edinga inhlanzeko.

. Konke okungenhla kuzothinta umphumela we-antioxidant.

. I-volatile isho into ethembisayo imikhiqizo ye-polymer equkethe imikhiqizo yokuphunyuka ye-antioxidants lapho ifudumala, futhi kukhuphuka indawo yokuncibilika kanye nokuqina kwesisindo se-antioxidants incane.

• Ukukhethwa kwama-antioxidants aphambili

I-phenolic eyisisekelo ye-antioxidant evame ukusetshenziswa kakhulu kuma-polymers ngoba ayingcolisi umkhiqizo, isondele ubuthi obumhlophe, obungelona ubuthi. Inani lokungezelwa le-0.4% ~ 0.45% livinjelwe antioxidant main antioxidant line-antioxidant enhle, kepha kulula ukufaka imibala nemikhiqizo ye-aclemer enobuthi, futhi ayisetshenziswa kangako kuma-polymers. Kwesinye isikhathi ingasetshenziswa kuphela emikhiqizweni ye-polymer emnyama. Ukungezwa kwe-synergistic kwezinhlobo ezahlukahlukene zama-antioxidants aphambili kunomphumela ongcono kunokungezwa okukodwa, okufana ne-phenol / i-phenol evinjelwe noma inhlanganisela ye-phenol evinjelwe.

• Ukukhetha ama-antioxidants auxilizayo

I-Phosfute inomphumela omuhle we-synergistic nge-antioxidant eyinhloko, futhi inezinga elithile le-antioxidant, ukumelana nokushisa, ukumelana kwesimo sezulu kanye nombala kungukungamelana kwamanzi, kepha kungakhetha uhlobo olusanda kuthuthukiswa kwamanzi. Ukusetshenziswa kwama-antioxidants aqukethe ama-sulfur aqukethe ama-pulfur awabanzi njenge-phosfu, futhi kulula ukukhiqiza ukungcoliswa kwe-sulfur lapho kuhlanganiswe nezinye izengezo, futhi kunomthelela ophikisayo onabazwe abanamanzi.

• Umphumela we-Synergistic of antioxidants ayisisekelo futhi esibucayi

Ama-antioxidants asizayo kufanele angezwe ku-Synergy ne-antioxidant eyinhloko yokuba nomphumela we-antioxidant, futhi anganciphisa inani le-antioxidant eyisisekelo engezwe, futhi ukwengeza kwalo kukodwa akunawo umphumela we-antioxidant. Izinhlobo ezihlanganisiwe zama-antioxidants zivinjelwe i-phenol / i-thiatheereeathert, i-phosphite / i-antiol eyinhloko, njll. I-antioxidant eyinhloko i-phenolic 1010, 1076, 26, njll.