Ukufundisa ukuthi ungayikhetha kanjani i-epoxy resin curing agent?

I-epoxy curing agent iyikhemikhali esetshenziselwa ukwelaphaama-resin epoxyngokusabela ngamakhemikhali namaqembu e-epoxy ku-resin ye-epoxy ukuze kwakheke isakhiwo esixhumene, ngaleyo ndlela kwenza i-resin ye-epoxy ibe yinto eqinile neqinile.
Indima eyinhloko yama-epoxy curing agents ukuthuthukisa ubulukhuni, ukumelana nokuklwebheka, kanye nokumelana namakhemikhali kwama-epoxy resins, okwenza abe yinto ehlala isikhathi eside futhi eqinile, okuyingxenye ebalulekile yama-epoxy pultruded composites. Lesi sihloko sabelana ngendlela yokukhetha i-epoxy-curing agent efanele ngokusekelwe ezicini ezahlukene:
Ngokwezimo zokuphulukisa
- Ukwelapha ekushiseni kwegumbi: Uma kudingeka ukwelapha okusheshayo ekushiseni kwegumbi, ama-ejenti okwelapha e-aliphatic amine afana ne-ethylenediamine kanye ne-diethylenetriamine angakhethwa; uma ijubane lokwelapha lingadingeki libe phezulu, futhi kugxilwe esikhathini sokusebenza, ama-ejenti okwelapha e-polyamide angakhethwa.
- Ukushisa: Ukuze kuvikelwe ukushisa okuphezulu kanye nezakhiwo zemishini, ama-aromatic amine curing agents, njenge-diaminodiphenylsulfone (DDS), njll., angasetshenziswa; ukuze kulungiswe ukushisa okusheshayo okuphansi, ama-modified amine curing agents ane-accelerators angacatshangelwa.
- Ukwelapha ngaphansi kwezimo ezikhethekile: ukuze kulungiswe endaweni enomswakama, kungakhethwa i-ejenti yokwelapha emanzi; ohlelweni lokwelapha olulula, kungakhethwa i-ejenti yokwelapha ene-photoinitiator kanye ne-epoxy acrylate.
Ngokwezidingo zokusebenza
- Izakhiwo zemishini: uma kudingeka ubulukhuni obuphezulu kanye namandla aphezulu, ama-ejenti okwelapha i-anhydride angakhethwa; uma kudingeka ukuguquguquka okuhle kanye nokumelana nomthelela, ama-ejenti okwelapha okuqinisayo njengerabha ye-polysulfide afaneleka kakhulu.
- Ukumelana namakhemikhali: izidingo eziphezulu ekumelaneni ne-asidi, i-alkali, kanye ne-solvent,i-resin ye-phenolici-ejenti yokwelapha noma enye i-ejenti yokwelapha ye-amine eguquliwe ifaneleka kakhulu.
- Ukumelana nokushisa: Ezindaweni ezishisa kakhulu, njengezingaphezu kuka-200℃, i-ejenti yokwelapha ye-silicone noma i-ejenti yokwelapha enesakhiwo se-polyaromatic ingacatshangelwa.
Ngokusho kwendawo yokusetshenziswa
- Indawo yangaphakathi: izidingo eziphezulu zokuvikela imvelo, i-ejenti yokwelapha e-epoxy esekelwe emanzini noma i-ejenti yokwelapha e-aliphatic amine eguquguqukayo ephansi ifaneleka kakhulu.
- Indawo engaphandle: kudingeka ukumelana nesimo sezulu okuhle, ama-alicyclic amine curing agents anokumelana okuhle kwe-UV afaneleka kakhulu.
- Izindawo ezikhethekile: Ezindaweni ezinezidingo eziphezulu zokuhlanzeka njengokudla nemithi, ama-ejenti okwelapha e-epoxy angenabo ubuthi noma angenabo ubuthi obuphansi njengama-ejenti okwelapha e-polyamide aqinisekisiwe okuphepha kokudla kudingeka akhethwe.
Cabanga ngezidingo zenqubo
- Isikhathi sokusebenza: Ngesikhathi sokusebenza eside, khetha i-ejenti yokwelapha efihliwe, njenge-dicyandiamide, njll. Ngesikhathi sokusebenza esifushane nesikhathi sokwelapha, khetha i-ejenti yokwelapha ye-aliphatic amine esheshayo.
- Ukubukeka Kokwelapha: Ukuze uthole ukubukeka kokwelapha okungenambala nokusobala, khetha ama-alicyclic amine curing agents, njll. Ukuze uthole izidingo zombala ophansi, khetha ama-amine curing agents abiza kancane.
Kuhlanganiswe nesici sezindleko
- Ngaphansi kwesisekelo sokuhlangabezana nezidingo zokusebenza, qhathanisa intengo kanye nomthamo wezinto ezihlukene zokwelapha. Intengo yezinto ezivamile zokwelapha i-amine iphansi kakhulu, kuyilapho ezinye izinto ezikhethekile zokwelapha ezifana nezinto eziqukethe i-fluorine kanye nezinto eziqukethe i-silicone zibiza kakhulu.