Intshayelelo

I-Antioxidants (okanye i-heat stabilizers) izongezo ezisetyenziselwa ukuthintela okanye ukulibazisa ukuthotywa kweepolymers ngenxa ye-oksijini okanye i-ozone emoyeni. Zizona zongezo ezisetyenziswa kakhulu kwizinto zepolymer. Iingubo ziya kuthotywa kwi-oxidation ye-thermal emva kokuba zibhakwe kumaqondo obushushu aphezulu okanye zibekwe elangeni. I-Phenomena efana nokuguga kunye ne-yellowing iya kuchaphazela kakhulu ukubonakala kunye nokusebenza kwemveliso. Ukuthintela okanye ukunciphisa ukwenzeka kwalo mkhwa, ii-antioxidants zihlala zongezwa.

Ukuthotywa kwe-Thermal oxidation yeepolymers kubangelwa ubukhulu becala yi-chain-type free radical reaction eqalwa yi-radicals yasimahla eyenziwa yi-hydroperoxides xa ishushu. Ukuthotywa kwe-Thermal oxidation yeepolymers kunokuthintelwa ngokubamba i-radical yamahhala kunye nokubola kwe-hydroperoxide, njengoko kubonisiwe kumzobo ongezantsi. Phakathi kwabo, i-antioxidants inokuthintela i-oxidation engentla kwaye ke isetyenziswa ngokubanzi.

Iintlobo ze-antioxidants

Ii-Antioxidantszinokwahlulwa zibe ziindidi ezintathu ngokwemisebenzi yazo (okt, ungenelelo lwazo kwinkqubo yekhemikhali ye-auto-oxidation):

ikhonkco eliphelisa ii-antioxidants: ikakhulu zibamba okanye zisuse iiradicals zasimahla ezenziwe yi-polymer auto-oxidation;

i-hydroperoxide ebolayo i-antioxidants: ngokuyininzi ikhuthaza ukubola kwe-non-radical ye-hydroperoxides kwiipolymers;

I-ion ye-metal passivating antioxidants: inokwenza i-chelates ezinzileyo kunye neeyoni zetsimbi ezinobungozi, ngaloo ndlela igqithise impembelelo ye-catalytic ye-ion yesinyithi kwinkqubo ye-auto-oxidation yeepolymers.

Phakathi kweentlobo ezintathu ze-antioxidants, i-chain-terminating antioxidants ibizwa ngokuba yi-antioxidant ephambili, ikakhulu ethintelwe i-phenols kunye ne-amines emnandi; ezinye iindidi ezimbini zibizwa ngokuba zii-antioxidants ezincedisayo, ezibandakanya i-phosphites kunye neetyuwa zentsimbi ze-dithiocarbamate. Ukuze ufumane i-coating ezinzileyo ehlangabezana neemfuno zesicelo, udibaniso lwama-antioxidants amaninzi luhlala lukhethwa.

Ukusetyenziswa kwe-antioxidants kwiingubo

1. Isetyenziswe kwi-alkyd, i-polyester, i-polyester engaxutywanga
Kwizinto eziqulethe ioli ye-alkyd, kukho izibophelelo eziphindwe kabini kwiidigri ezihlukeneyo. Iibhondi eziphindwe kabini, iibhondi eziphindwe kabini, kunye neebhondi ezidityanisiweyo eziphindwe kabini zifakwa kwi-oxidized ngokulula ukwenza iiperoxides kumaqondo obushushu aphezulu, zenza umbala ube mnyama, ngelixa i-antioxidants inokubola i-hydroperoxides ukuze ikhanyise umbala.

2. Isetyenziswe kwi-synthesis ye-agent ye-PU yokunyanga
I-PU yokunyanga i-arhente ngokubanzi ibhekisa kwi-prepolymer ye-trimethylolpropane (TMP) kunye ne-toluene diisocyanate (TDI). Xa i-resin ibonakaliswe kubushushu kunye nokukhanya ngexesha lokudibanisa, i-urethane ibola ibe yi-amines kunye ne-olefins kwaye iphule ikhonkco. Ukuba i-amine inevumba elimnandi, ifakwa ioksijini ukuze ibe yiquinone chromophore.

3. Isicelo kwi-thermosetting powder coatings
I-antioxidant edibeneyo ye-phosphite ephezulu kunye ne-phenolic antioxidants, efanelekileyo ekukhuseleni i-powder coatings kwi-thermal oxidative degradation ngexesha lokucubungula, ukunyanga, ukushisa kunye nezinye iinkqubo. Izicelo ziquka i-polyester epoxy, i-TGIC ye-isocyanate evaliweyo, i-TGIC substitutes, i-linear epoxy compounds kunye ne-thermosetting acrylic resins.

Nanjing Reborn New Materials inikeza iintlobo ezahlukeneyo zeantioxidantsyeplastiki, yokwambathisa, amashishini erabha.

Ngokuqulunqwa kwezinto ezintsha kunye nenkqubela phambili yoshishino lweengubo, ukubaluleka kwe-antioxidants kwi-coatings kuya kubonakala ngakumbi, kwaye indawo yophuhliso iya kuba banzi. Kwixesha elizayo, i-antioxidants iya kukhula kwicala lobunzima obuphezulu bemolekyuli, ubuninzi bokusebenza, ukusebenza kakuhle okuphezulu, ubutsha, ukudibanisa, ukuphendula kunye nokukhuselwa kokusingqongileyo okuluhlaza. Oku kufuna ukuba iingcali ziqhube uphando olunzulu kuzo zombini izixhobo kunye nemiba yesicelo ukuziphucula ngokuqhubekayo, ukwenza uphando olunzulu malunga neempawu zesakhiwo se-antioxidants, kwaye baphuhlise ngakumbi ama-antioxidants amatsha kunye asebenzayo asekwe koku, okuya kuba nefuthe elinzulu ekusetyenzweni nasekusetyenzisweni kweshishini lezogquma. Ii-Antioxidants zokwaleka ziya kwandisa amandla azo amakhulu kwaye zizise izibonelelo ezigqwesileyo kwezoqoqosho nakwithekhinoloji.