Ukwelashwa kwe-UV kubhekisela ekwelapheni kwe-UV ohlelweni lokwelapha ngemisebe (okubizwa ngokuthi ukwelapha kwe-UV).Ubuchwepheshe bokwelapha ngemisebe ubuchwepheshe obusha obuluhlaza, obubhekisela enqubweni ye-polymerization esheshayo kanye nokwelapha okuxhumanisa okuxhumanisa uhlelo lwesigaba se-liquid ngokusebenzisa ukukhanya kwe-ultraviolet, i-electron beam kanye ne-r-ray irradiation.Inezinzuzo zokonga amandla, ukusebenza kahle okuphezulu, ukusebenza okuhle kakhulu kokumboza, ukonga iglue, ukuphepha nokuvikelwa kwemvelo, ukukhanya okuphezulu, ubude besikhathi, njll. Itshe lemvelo ngokwalo linokukhubazeka okuthile, njengemigodi, imifantu, amapuleti angalingani, njll. (kokubili i-granite ne-marble zikhona).
Izici zendlela yokwakha:
I-1) Ukusebenza okuhle kakhulu kokuhlanganisa: I-UV yokuphulukisa i-UV inokusebenza okuhle kakhulu, isicwebezelisi esiphezulu, ubulukhuni obuphezulu, nokumelana okuhle kwamakhemikhali.Ukuthuthukisa ngokuphumelelayo ikhwalithi yokulungisa izimbobo zamatshe.
2) Ukuphepha kanye nokuvikelwa kwemvelo: Ngenxa yokuthi ijubane lokuphulukisa le-UV liyashesha kakhulu, ukukhishwa kwezinyibilikisi ze-organic emoyeni kuncipha kuze kufike ku-zero, okuphephile futhi okuhambisana nemvelo.
Umgomo wenqubo:
Izembatho ze-UV ziyizingubo ezilaphekayo ze-UV.Ngemuva kokuthi izimbotshana ezilaphekayo ze-UV zikhanyiswe ukukhanya kwe-UV, i-photoinitiator iqala ukumunca amandla emisebe ye-UV futhi isebenze.Ama-electron akungqimba olungaphandle lwama-molecule awo agxuma futhi akhiqize isikhungo esisebenzayo ngesikhathi esifushane kakhulu.Khona-ke isikhungo esisebenzayo sisebenza namaqembu angagcwele ku-resin, okubangela ukuthi izibopho eziphindwe kabili ku-resin ephulukisayo ekhipha ukukhanya kanye nama-molecule e-diluent asebenzayo anqanyulwe, okuholela ekuphenduleni kwe-polymerization okuqhubekayo, ukuze banqamule ukuxhumana ukuze benze ifilimu.Ucwaningo lwe-chemical kinetics lubonisa ukuthi indlela yokwelapha ye-UV ye-UV iyi-polymerization yamahhala ye-radical chain.Okokuqala, isigaba se-photoinitiation;Okwesibili yisigaba sokusabela sokukhula kweketango.Kulesi sigaba, njengoba ukukhula kweketango kuqhubeka, uhlelo luzoxhunywa futhi luqiniswe lube yifilimu;I-Z post chain radicals iqeda ukuphela kweketango ngokuhlanganisa noma ngokuhlukanisa.
1. Oligomer
I-prepolymer, eyaziwa nangokuthi i-oligomer noma i-resin, iwuhlaka lwamathambo eglue ye-UV.Ibhekisela kakhulu ekilasini lama-polymers wamangqamuzana anesakhiwo sebhondi ephindwe kabili engagcwele.Iphinde iphendule futhi yakhe umzimba wokwelapha oxhumene kakhulu ngemuva kokunwetshwa, okunikeza izinto ezisetshenziswayo ezinezakhiwo eziyisisekelo zomzimba namakhemikhali.Isibonelo, i-viscosity, amandla aqinile, amandla okugunda, ubulukhuni nokuhambisana.
2. I-Monomer
Ama-monomers, aziwa nangokuthi ama-reactive diluent, ama-molecule amancane aqukethe ibhondi eyodwa noma ngaphezulu, asetshenziswa kakhulu ukulungisa i-viscosity yesistimu futhi abambe iqhaza ku-polymerization, kodwa futhi abe nomthelela esilinganisweni se-polymerization kanye nezakhiwo ezibonakalayo.Ama-monomers angahlukaniswa abe ama-monomers asebenzayo, ama-monomer angasebenzi kabili kanye nama-monomer asebenza ngezinto eziningi ngokuya ngezinga lokusebenza.Ama-monofunctional monomers anenzuzo ukuthuthukisa ukuguquguquka nokunamathela kwe-colloid;Ama-monomer angasebenzi kanye nama-monomers asebenza ngezinto eziningi awagcini nje ngokusebenza njengama-diluent, kodwa futhi asebenza njengama-agent axhumanisayo.Banomthelela obalulekile ebukhuni, ukuqina namandla.
3. Ama-Photoinitiators)
Ama-Photoinitiators angama-intermediate asebenzayo angakwazi ukumunca i-ultraviolet noma ukukhanya okubonakalayo futhi akhiqize ikhono lokuqalisa i-polymerization ngokusebenzisa izinguquko zamakhemikhali.Ziyizingxenye ezibalulekile zesistimu ye-photopolymerization futhi zidlala indima ebalulekile ekuzweleni (izinga lokuphulukisa) lesistimu yokwelapha ye-UV.Ama-Photoinitiators afaka ama-photoinitiators wamahhala nama-cationic photoinitiators, asetshenziswa kumasistimu wama-radical wamahhala namasistimu e-cationic ngokulandelanayo.
Isikhathi sokuthumela: Nov-24-2022