Chiyambi

Ma antioxidants (kapena okhazikika kutentha) ndi zowonjezera zomwe zimagwiritsidwa ntchito poletsa kapena kuchedwetsa kuwonongeka kwa ma polima chifukwa cha mpweya kapena ozoni mumlengalenga. Ndi zowonjezera zomwe zimagwiritsidwa ntchito kwambiri mu zinthu za polima. Zophimbazo zimawonongeka ndi kutentha kwa okosijeni zikaphikidwa kutentha kwambiri kapena kukhudzidwa ndi dzuwa. Zochitika monga ukalamba ndi chikasu zimakhudza kwambiri mawonekedwe ndi magwiridwe antchito a chinthucho. Pofuna kupewa kapena kuchepetsa kuchitika kwa izi, ma antioxidants nthawi zambiri amawonjezeredwa.

Kuwonongeka kwa okosijeni wa ma polima kumachitika makamaka chifukwa cha kusintha kwa ma free radical komwe kumachitika chifukwa cha ma free radical omwe amapangidwa ndi ma hydroperoxides akatenthedwa. Kuwonongeka kwa okosijeni wa ma polima kumatha kulepheretsedwa ndi kugwidwa kwa ma free radical ndi kuwonongeka kwa hydroperoxide, monga momwe chithunzi chili pansipa chikusonyezera. Pakati pawo, ma antioxidants amatha kuletsa okosijeni omwe ali pamwambapa ndipo motero amagwiritsidwa ntchito kwambiri.

Mitundu ya ma antioxidants

Ma antioxidantsZingagawidwe m'magulu atatu malinga ndi ntchito zawo (monga, kulowerera kwawo mu njira ya mankhwala opangidwa ndi auto-oxidation):

ma antioxidants omwe amathetsa unyolo: makamaka amagwira kapena kuchotsa ma free radicals opangidwa ndi polymer auto-oxidation;

hydroperoxide yowononga ma antioxidants: makamaka amalimbikitsa kuwonongeka kosalekeza kwa ma hydroperoxide mu ma polima;

ma antioxidants oletsa kuwononga ma ayoni achitsulo: amatha kupanga ma chelate okhazikika okhala ndi ma ayoni achitsulo owopsa, motero amaletsa mphamvu yothandiza ya ma ayoni achitsulo pa njira yodzipangira yokha ya ma polima.

Pakati pa mitundu itatu ya ma antioxidants, ma antioxidants othetsa unyolo amatchedwa ma antioxidants oyamba, makamaka ma phenols otsekedwa ndi ma secondary aromatic amines; mitundu ina iwiri imatchedwa ma antioxidants othandizira, kuphatikizapo ma phosphites ndi mchere wa dithiocarbamate metal. Kuti mupeze utoto wokhazikika womwe umakwaniritsa zofunikira pakugwiritsa ntchito, kuphatikiza ma antioxidants angapo nthawi zambiri kumasankhidwa.

Kugwiritsa ntchito ma antioxidants mu zophimba

1. Amagwiritsidwa ntchito mu alkyd, polyester, polyester yosakhuta
Mu zigawo zomwe zili ndi mafuta a alkyd, pali ma bond awiriawiri pamlingo wosiyanasiyana. Ma bond awiriawiri, ma bond awiriawiri ambiri, ndi ma bond awiri olumikizidwa amasungunuka mosavuta kuti apange ma peroxide kutentha kwambiri, zomwe zimapangitsa mtundu kukhala wakuda, pomwe ma antioxidants amatha kuwola ma hydroperoxide kuti mtunduwo uwoneke wopepuka.

2. Amagwiritsidwa ntchito popanga mankhwala ochiritsa a PU
Chothandizira kuchiritsa cha PU nthawi zambiri chimatanthauza prepolymer ya trimethylolpropane (TMP) ndi toluene diisocyanate (TDI). Utomoni ukapezeka pa kutentha ndi kuwala panthawi yopangira, urethane umawola kukhala ma amine ndi ma olefin ndikuswa unyolo. Ngati amine ndi wonunkhira, umasungunuka kukhala quinone chromophore.

3. Kugwiritsa ntchito mu zophimba za ufa wa thermosetting
Ndi antioxidant yosakanikirana ya phosphite yogwira ntchito bwino komanso ma antioxidants a phenolic, yoyenera kuteteza utoto wa ufa ku kuwonongeka kwa okosijeni panthawi yokonza, kuchiritsa, kutentha kwambiri ndi njira zina. Ntchito zake zikuphatikizapo polyester epoxy, blocked isocyanate TGIC, TGIC substitutes, linear epoxy compounds ndi thermosetting acrylic resins.

Nanjing Reborn New Materials imapereka mitundu yosiyanasiyana yazoteteza ku matenda a antioxidantsmafakitale a pulasitiki, zokutira, ndi rabara.

Ndi luso ndi kupita patsogolo kwa makampani opanga zophimba, kufunika kwa ma antioxidants pa zophimba kudzaonekera bwino, ndipo malo oti chitukuko chikhale chachikulu. M'tsogolomu, ma antioxidants adzakula motsatira kuchuluka kwa mamolekyulu, magwiridwe antchito ambiri, magwiridwe antchito apamwamba, zatsopano, kuphatikiza, kuyankha komanso kuteteza chilengedwe chobiriwira. Izi zimafuna kuti akatswiri azichita kafukufuku wozama kuchokera ku njira ndi momwe amagwiritsidwira ntchito kuti apitirire kuwakonza, kuchita kafukufuku wozama pa kapangidwe ka ma antioxidants, ndikupanganso ma antioxidants atsopano komanso ogwira ntchito kutengera izi, zomwe zidzakhudza kwambiri kukonza ndi kugwiritsa ntchito makampani opanga zophimba. Ma antioxidants a zophimba adzagwiritsa ntchito mphamvu zawo zazikulu ndikubweretsa zabwino kwambiri zachuma komanso ukadaulo.