Isingeniso

Ama-antioxidants (noma ama-heat stabilizers) ayizithasiselo ezisetshenziselwa ukuvimbela noma ukubambezela ukuwohloka kwama-polymer ngenxa ye-oxygen noma i-ozone emkhathini. Yizithasiselo ezisetshenziswa kakhulu ezintweni ze-polymer. Izimbozo zizowohloka ngenxa yokushiswa kwe-thermal oxidation ngemva kokubhakwa emazingeni okushisa aphezulu noma zibekwe elangeni. Izinto ezifana nokuguga kanye nokuphuzi zizothinta kakhulu ukubukeka nokusebenza komkhiqizo. Ukuze kuvinjelwe noma kuncishiswe ukwenzeka kwalesi simo, ama-antioxidants avame ukungezwa.

Ukuwohloka kwe-thermal oxidation kwama-polymer kubangelwa kakhulu ukusabela kwe-free radical yohlobo lwe-chain okuqalwa ama-free radical akhiqizwa ama-hydroperoxide lapho eshiswa. Ukuwohloka kwe-thermal oxidation kwama-polymer kungavinjelwa ukubanjwa kwama-free radical kanye nokubola kwe-hydroperoxide, njengoba kuboniswe esithombeni esingezansi. Phakathi kwawo, ama-antioxidants angavimbela ukuwohloka okungenhla futhi ngenxa yalokho asetshenziswa kabanzi.

Izinhlobo zama-antioxidants

Ama-Antioxidantzingahlukaniswa ngezigaba ezintathu ngokwemisebenzi yazo (okungukuthi, ukungenelela kwazo enqubweni yamakhemikhali e-auto-oxidation):

ama-antioxidants aqeda uchungechunge: abamba noma asuse ama-free radical akhiqizwa yi-polymer auto-oxidation;

ama-antioxidants abola i-hydroperoxide: akhuthaza kakhulu ukubola okungaguquki kwama-hydroperoxide kuma-polymer;

ama-antioxidants adlulisa umoya: angakha ama-chelate azinzile ngama-ion ensimbi ayingozi, ngaleyo ndlela adlulise umoya umphumela we-catalytic wama-ion ensimbi enqubweni yoku-oxidation okuzenzakalelayo kwama-polymer.

Phakathi kwezinhlobo ezintathu zama-antioxidants, ama-antioxidants aqeda uchungechunge abizwa ngokuthi ama-antioxidants ayinhloko, ikakhulukazi ama-phenols avinjiwe kanye nama-aromatic amine esibili; ezinye izinhlobo ezimbili zibizwa ngokuthi ama-antioxidants asizayo, okuhlanganisa ama-phosphites kanye nosawoti wensimbi we-dithiocarbamate. Ukuze kutholakale ungqimba oluzinzile oluhlangabezana nezidingo zokusetshenziswa, inhlanganisela yama-antioxidants amaningi ivame ukukhethwa.

Ukusetshenziswa kwama-antioxidants ekumbozeni

1. Kusetshenziswa ku-alkyd, i-polyester, i-polyester engagcwele
Ezingxenyeni eziqukethe uwoyela ze-alkyd, kunezibopho ezimbili kuya emazingeni ahlukahlukene. Izibopho ezimbili ezi-single, izibopho ezimbili eziningi, kanye nezibopho ezimbili ezihlanganisiwe zi-oxidized kalula ukuze zenze ama-peroxide emazingeni okushisa aphezulu, okwenza umbala ube mnyama, kuyilapho ama-antioxidants engabolisa ama-hydroperoxide ukuze akhanyise umbala.

2. Kusetshenziswa ekwakhiweni kwe-PU ephilisayo
I-PU curing agent ngokuvamile ibhekisela ku-prepolymer ye-trimethylolpropane (TMP) kanye ne-toluene diisocyanate (TDI). Lapho i-resin ivezwa ekushiseni nasekukhanyeni ngesikhathi sokwenziwa, i-urethane iyabola ibe ama-amine nama-olefin bese iphula uchungechunge. Uma i-amine inephunga elimnandi, iyaxutshwa ibe yi-quinone chromophore.

3. Ukusetshenziswa kwe-thermosetting powder coating
I-antioxidant exubile ye-phosphite esebenza kahle kakhulu kanye nama-antioxidants e-phenolic, afanele ukuvikela upende lwempuphu ekuwohlokeni kwe-oxidative ekushiseni ngesikhathi sokucubungula, ukwelapha, ukushisa ngokweqile kanye nezinye izinqubo. Izicelo zifaka i-polyester epoxy, i-blocked isocyanate TGIC, ama-substitutes e-TGIC, ama-linear epoxy compounds kanye nama-thermosetting acrylic resins.

Izinto Ezintsha Ezintsha zaseNanjing zinikeza izinhlobo ezahlukene zeama-antioxidantkwezimboni zepulasitiki, zokumboza, zerabha.

Ngokusungula izinto ezintsha kanye nentuthuko yemboni yezokubopha, ukubaluleka kwama-antioxidants kwezokubopha kuzocaca kakhulu, futhi isikhala sentuthuko sizoba sikhulu. Esikhathini esizayo, ama-antioxidants azokhula ngokuya ngobuningi bama-molecule, ukusebenza okuningi, ukusebenza kahle okuphezulu, ukusha, ukuhlanganiswa, ukuphendula kanye nokuvikelwa kwemvelo okuluhlaza. Lokhu kudinga ochwepheshe ukuthi benze ucwaningo olujulile kuzo zombili izici zendlela kanye nokusetshenziswa ukuze bazithuthukise njalo, benze ucwaningo olujulile ngezici zesakhiwo sama-antioxidants, futhi bathuthukise ama-antioxidants amasha futhi asebenzayo ngokusekelwe kulokhu, okuzoba nomthelela omkhulu ekucutshungulweni nasekusetshenzisweni kwemboni yezokubopha. Ama-antioxidants ezokubopha azosebenzisa kakhulu amandla awo amakhulu futhi alethe izinzuzo ezinhle kakhulu kwezomnotho nakwezobuchwepheshe.