Intshayelelo

Ii-antioxidants (okanye iziqinisi zobushushu) zizongezo ezisetyenziselwa ukuthintela okanye ukulibazisa ukonakala kwee-polymers ngenxa ye-oksijini okanye i-ozone emoyeni. Zezona zongezo zisetyenziswa kakhulu kwizinto ze-polymer. Iingubo ziya kubola emva kokubhaka kumaqondo obushushu aphezulu okanye zibekwe elangeni. Izinto ezifana nokwaluphala kunye nokutyheli ziya kuyichaphazela kakhulu imbonakalo kunye nokusebenza kwemveliso. Ukuze kuthintelwe okanye kuncitshiswe ukwenzeka kwale ndlela, ii-antioxidants zihlala zongezwa.

Ukuwohloka kwe-thermal oxidation yeepolymers kubangelwa ikakhulu yi-chain-type free radical reaction eqalwa yi-free radicals eveliswa yi-hydroperoxides xa ishushu. Ukuwohloka kwe-thermal oxidation yeepolymers kunokuthintelwa kukubanjwa kwe-free radical kunye nokubola kwe-hydroperoxide, njengoko kubonisiwe kumfanekiso ongezantsi. Phakathi kwazo, ii-antioxidants zinokuthintela i-oxidation engentla kwaye ke ngoko zisetyenziswa kakhulu.

Iintlobo zee-antioxidants

Ii-AntioxidantsZinokwahlulwa zibe ziindidi ezintathu ngokwemisebenzi yazo (oko kukuthi, ukungenelela kwazo kwinkqubo yeekhemikhali ye-auto-oxidation):

uthotho lwee-antioxidants eziphelisa uthotho lwee-antioxidants: ngokuyintloko zibamba okanye zisusa ii-free radicals eziveliswa yi-polymer auto-oxidation;

ii-antioxidants ezibola i-hydroperoxide: ikakhulu zikhuthaza ukubola okungaguqukiyo kwee-hydroperoxides kwiipolymers;

ii-metal ion ezithintela ii-antioxidants: zinokwenza ii-chelates ezizinzileyo ezinee-metal ion eziyingozi, ngaloo ndlela zithintela isiphumo se-catalytic see-metal ion kwinkqubo ye-auto-oxidation yee-polymers.

Phakathi kweentlobo ezintathu zee-antioxidants, ii-antioxidants eziphelisa uthotho zibizwa ngokuba zii-antioxidants eziphambili, ikakhulu ii-phenols ezithintelweyo kunye nee-aromatic amines zesibini; ezinye iintlobo ezimbini zibizwa ngokuba zii-antioxidants ezincedisayo, kubandakanya ii-phosphites kunye neetyuwa zesinyithi ze-dithiocarbamate. Ukuze kufunyanwe uqweqwe oluzinzileyo oluhlangabezana neemfuno zokusetyenziswa, indibaniselwano yee-antioxidants ezininzi idla ngokukhethwa.

Ukusetyenziswa kwee-antioxidants kwiingubo

1. Isetyenziswa kwi-alkyd, i-polyester, i-polyester engagcwaliyo
Kwizinto eziqulethe ioyile ze-alkyd, kukho iibhondi eziphindwe kabini ukuya kumanqanaba ahlukeneyo. Iibhondi eziphindwe kabini, iibhondi eziphindwe kabini ezininzi, kunye neebhondi eziphindwe kabini ezidityanisiweyo zifakwa i-oxid ngokulula ukuze zenze ii-peroxides kumaqondo obushushu aphezulu, okwenza umbala ube mnyama, ngelixa ii-antioxidants zinokubolisa ii-hydroperoxides ukuze zikhanyise umbala.

2. Isetyenziswa ekuhlanganiseni iarhente yokunyanga ye-PU
I-PU curing agent idla ngokubhekisa kwi-prepolymer ye-trimethylolpropane (TMP) kunye ne-toluene diisocyanate (TDI). Xa i-resin ivezwa kubushushu nasekukhanyeni ngexesha lokwenziwa kwayo, i-urethane iyabola ibe yi-amines kunye ne-olefins kwaye iphule uthotho. Ukuba i-amine inevumba elimnandi, iyaxutywa ibe yi-quinone chromophore.

3. Ukusetyenziswa kwiingubo zomgubo we-thermosetting
I-antioxidant exutyiweyo ye-phosphite esebenza kakuhle kunye ne-phenolic antioxidants, efanelekileyo ekukhuseleni i-powder coatings kwi-thermal oxidative degradation ngexesha lokucubungula, ukucoca, ukutshisa kakhulu kunye nezinye iinkqubo. Usetyenziso luquka i-polyester epoxy, i-blocked isocyanate TGIC, ii-TGIC substitutes, ii-linear epoxy compounds kunye ne-thermosetting acrylic resins.

Izixhobo ezintsha zeNanjing Reborn zibonelela ngeentlobo ezahlukeneyo zeii-antioxidantskwimizi-mveliso yeplastiki, yokugquma, neyerabha.

Ngokuphucuka kunye nenkqubela phambili yeshishini leengubo, ukubaluleka kwee-antioxidants kwiingubo kuya kucaca ngakumbi, kwaye indawo yophuhliso iya kuba banzi. Kwixesha elizayo, ii-antioxidants ziya kukhula kwicala le-high relative molecular mass, multifunctionality, high efficiency, newness, compositeness, response and green occurrent. Oku kufuna ukuba iingcali zenze uphando olunzulu kuzo zombini iindlela kunye neempawu zesicelo ukuze ziqhubeke nokuziphucula, zenze uphando olunzulu kwiimpawu zesakhiwo see-antioxidants, kwaye ziphuhlise ngakumbi ii-antioxidants ezintsha nezisebenzayo ngokusekelwe koku, eziya kuba nefuthe elikhulu ekucutshungulweni nasekusetyenzisweni kweshishini leengubo. Ii-antioxidants kwiingubo ziya kusebenzisa amandla azo amakhulu kwaye zizise iingenelo zoqoqosho kunye netekhnoloji ezibalaseleyo.