Ama-phenolic Antioxidant avinjiwe ayizinhlanganisela ezinezakhi endaweni eyodwa noma zombili izinhlangothi zeqembu le-hydroxyl leringi ye-benzene. Ngokuya ngenani lamaqembu asebenzayo e-phenolic evinjiwe ku-molecule yawo, ngokuvamile ihlukaniswa ibe yi-phenolic eyodwa evinjiwe kanye{1}}ne-hindered phenolic. Kulesi sihloko, sizochaza indlela okuvimbela ngayo ama-antioxidants e-phenolic avikela ama-polymers.
Iyini indlela yokuguga kwe-polymer?
Ngesikhathi sokusetshenziswa noma ukugcinwa, ama-polymers angathola ukusabela kokuwohloka ngenxa yokushisa, ukukhanya, i-ozone oxidation noma i-ion catalysis yensimbi. Izakhiwo zomkhiqizo zibe sezincipha, njengokushintsha kombala, ukunamathela, ukonakala, noma ukuqhekeka. Ngenxa yalokho, inani lokusetshenziswa liyalahleka.
Ku-radical chain oxidation yama-polymers, ama-phenolic antioxidants avinjiwe anikela ngama-proton ukuze akhe ama-phenolic oxygen radicals. Njengoba i-free radical kanye neringi ye-benzene zakha isistimu ehlanganisiwe, inozinzo oluhle nomsebenzi ophansi, ongabambezela inqubo{1}}edalwe yi-oxidation. Ngasikhathi sinye, ama-phenolic oxygen radicals nawo anamandla okukhipha ama-radicals mahhala, anganqamula ukusabela kweketango le-oxidation.
Izinhlobo eziyinhloko kanye nokusetshenziswa kwama-antioxidant e-phenolic avinjiwe
I-Monophenolic Antioxidants ineyunithi eyodwa kuphela evimbele i-phenolic. Ikakhulukazi -okungangcolisi, akukho ukungcola. Kodwa-ke, isisindo samangqamuzana sincane futhi siguquguquka, esinciphisa umphumela we-antioxidant. Ingasetshenziswa kuphela ezinhlelweni ezingadingi ukumelana nesimo sezulu esiphezulu. Isibonelo, eminye imikhiqizo ye-Omnistab kulesi sigaba yilena:
I-Omnistab AN 1076; Ukuhambisana okuhle kakhulu nezinto eziningi ze-polymer, ukuguquguquka okuphansi, ukumelana okuhle kwemvula. Okufana ne-PP, i-PE, i-PVC, i-PA, i-ABS, i-PS, i-PVC, i-SBS, i-PU, i-PET, i-PMMA.
I-Omnistab AN 1135; uketshezi olusebenza kakhulu luvimbele i-phenolic antioxidant ene-dispersibility enhle. Isibonelo, i-PUR, i-PMMA, i-PVB, i-coatings nama-adhesives.
I-Omnistab AN 565; ilungele ukucubungula ama-rubber angagcwele. Ingakwazi ukuzinzisa ngempumelelo i-thermo-ukuguga kwe-oxidative kanye nokuwohloka kwama-elastomers, futhi ingavimbela ukwenzeka kwe-gelation. Ifanele i-SBS, i-SIS, i-TPE, i-BR, i-SBR namanye amarabha.
I-Bisphenol antioxidant
I-Bisphenol Antioxidants ibhekisela kuma-antioxidant e-phenolic lapho amayunithi amabili e-phenol avinjiwe axhunywe ngokuqondile nge-alkyl bond noma isibopho sesulfure. Uma kuqhathaniswa nohlobo lwe-monophenolic, uhlobo lwe-bisphenolic lunesisindo se-molecular ephakeme kanye nokuzinza kwe-thermal okuthuthukisiwe, ngakho lunomphumela ongcono wokunqanda{1}}ukuguga. Ama-antioxidants amabili e-Omnistab bisphenol yilezi:
I-Omnistab AN 1035; iyi-sulphur evimbele i-phenolic antioxidant ehlinzeka ngokuzinza kokucubungula kuma-polymers. Isetshenziswa kakhulu kuntambo ye-PE nekhebula, noma i-PP, i-HDPE, i-PUR.
I-Omnistab AN 1024; i-passivator yensimbi enemisebenzi emibili ye-anti{1}}i-oxidation kanye ne-metal passivation
I-Polyphenol Antioxidant
Ama-antioxidants e-polyphenol aqukethe amayunithi angaphezu kwamabili avimbekile e-phenol esakhiweni sawo samangqamuzana. Imikhiqizo emithathu ye-Omnistab, eyi-polyphenol Antioxidants:
I-Omnistab AN 1010; Ukuguquguquka okuphansi, ukungabi naphunga, okunamandla kakhulu kuvimbele i-phenolic antioxidant. Kuhle kakhulu ku-PP, PE, PVC, PA, PBT, PET kanye nokunamathelayo.
I-Omnistab AN 1330; ifaneleka kakhulu imikhiqizo ye-polyolefin edinga ukumelana okuphezulu nokukhishwa kwamanzi nokushintsha umbala. Isicelo nge-PP, HDPE, TPE, ABS, PVC.
I-Omnistab AN 3114; isebenza kahle kakhulu kuma-polyolefin. I-Omnistab AN 3114 isebenzisana nezibambisi ze-UV noma ama-phosphite.
Imihlahlandlela yokusetshenziswa kwe-phenolic antioxidants evinjiwe
Ukusetshenziswa okuhlanganisiwe kwe-phenolic antioxidants evinjiwe kanye ne-phosphite noma i-thioester Antioxidants kungaveza imiphumela ye-synergistic! Ama-phenolic Antioxidant avinjiwe asebenza njengezinqamuleli zamaketanga ngokukhipha ama-radicals mahhala. Kodwa-ke, ama-phenols avinjiwe awakwazi ukubola ama-hydroperoxides, ngakho-ke kufanele asetshenziswe kaningi nama-antioxidants esibili (njengama-phosphites noma ama-thioesters) nama-HALS.
Ungathanda ukufunda okwengeziwe mayelana nenqubo noma uthole isicelo-iseluleko esiqondile? Xhumana nathi futhi sizokujabulela ukukusiza. sizame!
