Hordhac

Antioxidants (ama xasiliyeyaasha kulaylka) waa daroogo loo isticmaalo in lagu joojiyo ama dib u dhigo xaalufka polymers sababtoo ah ogsijiinta ama ozone ee jawiga. Waxay yihiin kuwa ugu badan ee lagu daro walxaha polymer. Dahaarku waxay mari doonaan xaalufka oksaydhka kulaylka ka dib marka lagu dubo heerkul sare ama ay soo gaadhaan iftiinka qorraxda. Ifafaalaha sida gabowga iyo jaalaha ayaa si dhab ah u saameyn doona muuqaalka iyo waxqabadka alaabta. Si looga hortago ama loo yareeyo dhacdooyinka isbeddelkan, antioxidants ayaa inta badan lagu daraa.

Burburinta oksaydhka kulaylka ee polymers-ka waxaa inta badan sababa fal-celinta xagjirka xorta ah ee nooca silsiladda ah oo ay bilaabeen xagjirrada xorta ah ee ay dhaliyaan hydroperoxides marka la kululeeyo. Burburinta oksaydhka kulaylka ee polymers-ka waxaa lagu joojin karaa qabsashada xagjirka bilaashka ah iyo burburka hydroperoxide, sida ku cad shaxanka hoose. Waxaa ka mid ah, antioxidants waxay joojin karaan oksaydhka kor ku xusan oo sidaas darteed si ballaaran ayaa loo isticmaalaa.

Noocyada antioxidants

Antioxidantswaxaa loo qaybin karaa saddex qaybood iyadoo loo eegayo hawlahooda (tusaale ahaan, faragelintooda habka kiimikada auto-oxidation):

silsilad joojinta antioxidants: inta badan waxay qabtaan ama ka saaraan xagjirnimada xorta ah ee ay dhaliso polymer auto-oxidation;

Hydroperoxide xumeeya antioxidants: waxay inta badan kor u qaadaan burburka aan xagjirka ahayn ee hydroperoxides ee polymers;

ion bir ah antioxidants passivating: waxay samayn karaan chelates xasilloon oo leh ions biraha waxyeello leh, taas oo ka dhigaysa saamaynta catalytic ee ions biraha on habka auto-oxidation ee polymers.

Ka mid ah saddexda nooc ee antioxidants, antioxidants-ka joojiya silsiladaha waxaa loo yaqaan 'antioxidants' aasaasiga ah, inta badan phenols xannibay iyo amines udugga sare; Labada nooc ee kale waxaa loo yaqaan 'antioxidants', oo ay ku jiraan phosphites iyo dithiocarbamate cusbada birta ah. Si loo helo dahaar deggan oo buuxiya shuruudaha codsiga, isku darka antioxidants badan ayaa badanaa la doortaa.

Codsiga antioxidants ee dahaarka

1. Waxaa loo isticmaalaa alkyd, polyester, polyester aan saturated lahayn
Qaybaha saliidda ku jira ee alkyd, waxaa jira bonds double ilaa heerar kala duwan. Xirmooyinka labajibbaaran, xidhmooyin badan oo labajibbaaran, iyo isku-xidhka labajibbaaran ayaa si fudud u oksaydhaysan si ay u sameeyaan peroxides heerkulka sare, samaynta midabka madow, halka antioxidants ay qurxin karaan hydroperoxides si ay u iftiimiyaan midabka.

2. Waxaa loo adeegsaday isku dhafka wakiilka daawaynta PU
Wakiilka daawaynta PU guud ahaan waxa loola jeedaa prepolymer ee trimethylolpropane (TMP) iyo toluene diisocyanate (TDI). Marka resinku u soo baxo kulaylka iyo iftiinka inta lagu jiro synthesis, urethane-ku wuxuu u kala baxaa amines iyo olefins wuxuuna jebiyaa silsiladda. Haddii amiinku uu yahay caraf udgoon, waa oksaydhized si uu u noqdo koromophore quinone ah.

3. Codsiga dahaarka budada heerkulbeegga
Antioxidant-ka isku dhafan ee fosfit-waxtarka sare leh iyo antioxidants phenolic, oo ku habboon ilaalinta daaha budada ah ee hoos u dhaca kuleylka kuleylka inta lagu jiro farsamaynta, daaweynta, kulaylka iyo hababka kale. Codsiyada waxaa ka mid ah epoxy polyester-ka, TGIC isocyanate xannibay, beddelka TGIC, xeryahooda epoxy linear iyo resins acrylic thermosetting.

Nanjing Qalabka Cusub ee Dib-u-dhashay wuxuu bixiyaa noocyo kala duwanantioxidantsbacaha, dahaarka, warshadaha caaga ah.

Hal-abuurka iyo horumarka warshadaha dahaarka, muhiimada antioxidants ee dahaarka ayaa noqon doona mid aad u muuqda, booska horumarinta ayaa noqon doona mid ballaaran. Mustaqbalka, antioxidants waxay u kobcin doonaan jihada cufan molecular qaraabo sare ah, hawlo badan, hufnaan sare, cusub, isku-dhafan, jawaab celin iyo ilaalinta deegaanka cagaaran. Tani waxay u baahan tahay dhakhaatiirta si ay u sameeyaan cilmi-baaris qoto dheer oo ka mid ah habka iyo dhinacyada codsiga si ay si joogto ah u wanaajiyaan, u sameeyaan cilmi-baaris qoto-dheer oo ku saabsan sifooyinka qaab-dhismeedka antioxidants, iyo sii horumarinta antioxidants cusub oo hufan oo ku salaysan tan, taas oo saameyn weyn ku yeelan doonta habka iyo codsiga warshadaha dharka. Antioxidants ee dahaarka ayaa si sii kordheysa u dadaali doona awoodooda weyn waxayna keeni doonaan faa'iidooyin dhaqaale iyo teknoloji oo aad u wanaagsan.