Intangiriro

Antioxydants (cyangwa ibigabanya ubushyuhe) ni inyongeramusaruro zikoreshwa mu gukumira cyangwa gutinza kwangirika kwa polymer bitewe na ogisijeni cyangwa ozone mu kirere. Ni inyongeramusaruro zikoreshwa cyane mu bikoresho bya polymer. Inyongeramusaruro zizangirika nyuma yo gutekwa ku bushyuhe bwinshi cyangwa ku zuba. Ibintu nk'ibisaza no guhinduka umuhondo bigira ingaruka zikomeye ku isura n'imikorere y'umusaruro. Kugira ngo hirindwe cyangwa bigabanye iyi ngeso, antioxydants zikunze kongerwamo.

Kwangirika kwa ogisijeni y'ubushyuhe bwa polimeri biterwa ahanini n'uburyo bwo gukora ogisijeni y'ubushyuhe bw'ubwoko bwa chain buterwa na ogisijeni y'ubushyuhe iterwa na hydroperoxides iyo ishyushye. Kwangirika kwa ogisijeni y'ubushyuhe bwa polimeri bishobora kubuzwa no gufata ogisijeni y'ubushyuhe no kubora kwa hydroperoxide, nk'uko bigaragara ku ishusho iri hepfo. Muri byo, ogisijeni zishobora kubuza ogisijeni yavuzwe haruguru bityo zikoreshwa cyane.

Ubwoko bw'ibirwanya okisidanti

Antioxydantsbishobora kugabanywamo ibyiciro bitatu bitewe n'imirimo yabyo (ni ukuvuga, uruhare rwabyo mu gikorwa cya shimi cyo kwimura ogisijeni mu buryo bwikora):

Antioxydants zikuraho uruhererekane: ahanini zifata cyangwa zikuraho radicals zigenga zikorwa na polymer auto-oxidation;

hydroperoxide iboza antioxydants: ahanini itera imbere kubora kudakabije kwa hydroperoxides muri polymers;

Antioxydants zituma iyoni y'icyuma ikora: zishobora gukora chelate zihamye hamwe na iyoni z'icyuma zangiza, bityo zigatuma iyoni z'icyuma zikora ku buryo bwo kwiyatsa polymer.

Mu bwoko butatu bwa antioxydants, antioxydants zikuraho uruhererekane zitwa antioxydants z’ibanze, cyane cyane phenols zibangamira na amines za kabiri zinuka; ubundi bwoko bubiri bwitwa antioxydants z’inyongera, harimo fosfite na dithiocarbamate metal salts. Kugira ngo haboneke irangi rihamye rijyanye n’ibisabwa, akenshi hatoranywa uruvange rwa antioxydants nyinshi.

Gukoresha antioxydants mu gusiga

1. Ikoreshwa muri polyester idafite ingano, alkyd, polyester idasembuye
Mu bice birimo amavuta bya alkyd, hari imigozi ibiri ku rugero rutandukanye. Imigozi ibiri imwe, imigozi ibiri myinshi, n'imigozi ibiri ihuriweho byoroshye gukururwa kugira ngo bikore peroxide ku bushyuhe bwinshi, bigatuma ibara riba rirabagirana, mu gihe antioxydants zishobora kubora hydroperoxides kugira ngo ibara rirusheho kugaragara neza.

2. Ikoreshwa mu gukora umuti wa PU
Umuti uvura PU muri rusange yerekeza kuri prepolymer ya trimethylolpropane (TMP) na toluene diisocyanate (TDI). Iyo resin ihuye n'ubushyuhe n'urumuri mu gihe cyo gukora, urethane irabora ikaba amine na olefini hanyuma igaca urunigi. Iyo amine ifite aromatike, irasubikwa kugira ngo ibe kromofore ya quinone.

3. Gukoresha ifu ikoreshwa mu gusiga thermosetting
Ni antioxydant ivanze irimo fosfite na phenolic antioxydants ikora neza cyane, ikwiriye kurinda ifu yangirika mu gihe cyo gutunganya, gukosora, gushyuha cyane n'izindi nzira. Ikoreshwa ririmo polyester epoxy, TGIC ya isocyanate ifunze, TGIC isimbura TGIC, epoxy compounds ya linear na thermosetting acrylic resins.

Nanjing Reborn New Materials itanga ubwoko butandukanye bwaantioxydantsku nganda za pulasitiki, irangi, n'izikora kabutura.

Hamwe n'udushya n'iterambere ry'inganda zikora irangi, akamaro ka antioxydants ku irangi kazarushaho kugaragara, kandi umwanya wo gutera imbere uzaba munini. Mu gihe kizaza, antioxydants zizakura mu cyerekezo cy'uburemere bwinshi bwa molekile, imikorere myinshi, imikorere myiza, ubushya, ubwuzuzanye, ubwitabire no kurengera ibidukikije. Ibi bisaba ko abakora inzobere bakora ubushakashatsi bwimbitse uhereye ku buryo n'uburyo bwo kubikoresha kugira ngo bakomeze kubinoza, bakore ubushakashatsi bwimbitse ku miterere ya antioxydants, kandi barusheho guteza imbere antioxydants nshya kandi zikora neza zishingiye kuri ibi, bizagira ingaruka zikomeye ku gutunganya no gukoresha inganda zikora irangi. Antioxydants ku irangi zizarushaho gukoresha ubushobozi bwazo bwinshi kandi zizane inyungu nziza mu bukungu n'ikoranabuhanga.