Isingeniso

Ama-Antioxidants (noma ama-heat stabilizers) ayizithasiselo ezisetshenziselwa ukuvimbela noma ukubambezela ukuwohloka kwama-polymers ngenxa yomoya-mpilo noma i-ozone emkhathini. Ziyizithasiselo ezisetshenziswa kakhulu ezintweni ze-polymer. Ama-coatings azolahlekelwa yi-thermal oxidation ngemva kokubhakwa emazingeni okushisa aphezulu noma evezwe elangeni. Izenzakalo ezifana nokuguga nokuphuzi zizothinta kakhulu ukubukeka nokusebenza komkhiqizo. Ukuze uvimbele noma unciphise ukwenzeka kwalo mkhuba, ama-antioxidants ngokuvamile ayengezwa.

Ukuwohloka kwe-oxidation ye-thermal yama-polymers kubangelwa ikakhulukazi uhlobo lwe-chain-free radical reaction oluqalwa ama-radicals mahhala akhiqizwa ama-hydroperoxides lapho kushisa. Ukuwohloka kwe-oxidation eshisayo yama-polymers kungavinjelwa ukubanjwa kwama-radical mahhala kanye nokubola kwe-hydroperoxide, njengoba kuboniswe esithombeni esingezansi. Phakathi kwazo, ama-antioxidants angavimbela i-oxidation engenhla ngakho-ke asetshenziswa kabanzi.

Izinhlobo zama-antioxidants

Ama-Antioxidantszingahlukaniswa zibe izigaba ezintathu ngokwemisebenzi yazo (okungukuthi, ukungenelela kwazo kunqubo yamakhemikhali e-auto-oxidation):

iketango eliqeda ama-antioxidants: abamba ikakhulukazi noma asuse ama-radicals mahhala akhiqizwa i-polymer auto-oxidation;

i-hydroperoxide ebolayo ama-antioxidants: ikakhulukazi akhuthaza ukubola okungeyona okukhulu kwama-hydroperoxides kuma-polymers;

I-metal ion passivating Antioxidants: bangakha ama-chelate azinzile ngama-ion ensimbi ayingozi, ngaleyo ndlela aqede umphumela we-catalytic we-ion yensimbi kunqubo ye-auto-oxidation yama-polymers.

Phakathi kwezinhlobo ezintathu zama-antioxidant, ama-antioxidant aqeda iketango abizwa ngokuthi ama-antioxidant ayinhloko, ikakhulukazi ama-phenols avinjiwe kanye nama-amine amnandi; ezinye izinhlobo ezimbili zibizwa ngokuthi ama-antioxidant asizayo, okuhlanganisa ama-phosphite nosawoti wensimbi we-dithiocarbamate. Ukuze uthole ukunamathela okuzinzile okuhlangabezana nezidingo zohlelo lokusebenza, inhlanganisela yama-antioxidants amaningi ngokuvamile iyakhethwa.

Ukusetshenziswa kwama-antioxidants enamathela

1. Isetshenziswe ku-alkyd, i-polyester, i-polyester engasetshenzisiwe
Ezingxenyeni eziqukethe amafutha e-alkyd, kunezibopho eziphindwe kabili kuya kumazinga ahlukene. Amabhondi aphindwe kabili, amabhondi aphindwe kabili, namabhondi ahlanganiswe kabili ahlanganiswa kalula ukuze akhe ama-peroxides emazingeni okushisa aphezulu, okwenza umbala ube mnyama, kuyilapho ama-antioxidants angakwazi ukubola ama-hydroperoxides ukuze kukhanye umbala.

2. Isetshenziswe ekuhlanganiseni i-ejenti yokwelapha ye-PU
I-PU elaphayo ngokuvamile ibhekisela ku-prepolymer ye-trimethylolpropane (TMP) kanye ne-toluene diisocyanate (TDI). Lapho i-resin ichayeka ekushiseni nasekukhanyeni ngesikhathi sokuhlanganiswa, i-urethane ibola ibe ama-amine nama-olefin bese inqamula iketango. Uma i-amine inephunga elimnandi, ikhishwa nge-oxid ukuze ibe i-quinone chromophore.

3. Isicelo ku-thermosetting powder coatings
I-antioxidant ehlanganisiwe ye-high-efficiency phosphite kanye ne-phenolic Antioxidants, efanelekile ukuvikela i-powder coatings ekuwohlokeni kwe-oxidative eshisayo ngesikhathi sokucubungula, ukuphulukisa, ukushisa ngokweqile nezinye izinqubo. Izicelo zifaka i-polyester epoxy, i-isocyanate TGIC evinjiwe, izithasiselo ze-TGIC, izinhlanganisela ze-epoxy ezinomugqa kanye nezinsalela ze-acrylic ze-thermosetting.

I-Nanjing Reborn New Materials inikeza izinhlobo ezahlukene zeama-antioxidantsokwepulasitiki, ukunamathela, izimboni zenjoloba.

Ngokusungulwa kanye nenqubekela phambili yemboni yezingubo zokugqoka, ukubaluleka kwama-antioxidants okugcoba kuzoba sobala kakhulu, futhi isikhala sokuthuthukiswa sizoba banzi. Ngokuzayo, ama-antioxidant azothuthuka ekuqondeni kwesisindo samangqamuzana aphezulu, ukusebenza okuningi, ukusebenza kahle okuphezulu, ubusha, ukuhlanganiswa, ukusabela kanye nokuvikelwa kwemvelo okuluhlaza. Lokhu kudinga ukuthi odokotela benze ucwaningo olunzulu kuzo zombili izici zemishini nezindlela zokuzisebenzisa ukuze baqhubeke bezithuthukisa, benze ucwaningo olunzulu mayelana nezici zesakhiwo sama-antioxidants, futhi bathuthukise ama-antioxidants amasha nasebenza kahle asekelwe kulokhu, okuzoba nomthelela omkhulu ekucutshungulweni nasekusetshenzisweni kwemboni yokumboza. Ama-Antioxidants ezingubo zokugqoka azosebenzisa amandla awo amakhulu futhi alethe izinzuzo ezinhle kakhulu zezomnotho nezobuchwepheshe.