Mai farawa haske

Mai farawa haske

A cikin tsarin ɗaukar hoto, gami da manne UV, murfin UV, tawada UV, da sauransu, canje-canjen sinadarai suna faruwa bayan karɓa ko ɗaukar makamashi na waje, kuma suna bazuwa cikin radicals kyauta ko cations, don haka yana haifar da amsawar polymerization.

Photoinitiators abubuwa ne waɗanda zasu iya samar da radicals kyauta kuma su kara fara polymerization ta hanyar haskakawa.Bayan an haskaka wasu monomers, suna ɗaukar photons kuma su samar da yanayi mai farin ciki M* : M+ HV →M*;

Bayan homolysis na kwayoyin da aka kunna, ana samar da m * → R·+ R '· radical free, sa'an nan kuma an ƙaddamar da polymerization na monomer don samar da polymer.

Fasahar warkar da Radiation sabuwar fasaha ce ta Ajiye Makamashi da Kariyar Muhalli, wacce ke haskakawa ta hasken ultraviolet (UV), hasken lantarki (EB), hasken infrared, hasken da ake iya gani, Laser, hasken sinadarai, da dai sauransu, kuma ya cika cikakkiyar “5E” Halayen: Ingantacce, Yin Taimakawa, Tattalin Arziki, Ajiye Makamashi, da Abokan Muhalli. Saboda haka, an san shi da "Green Technology".

Photoinitiator yana ɗaya daga cikin mahimman abubuwan da ake amfani da su na ɗaukar hoto, wanda ke taka muhimmiyar rawa wajen warkarwa.

Lokacin da hasken ultraviolet ya kunna mai daukar hoto, yana ɗaukar makamashin hasken kuma ya rabu zuwa radicals masu aiki guda biyu masu aiki, wanda ke farawa da sarkar polymerization na resin photosensitive da diluent mai aiki, wanda ke yin haɗin giciye da kuma ƙarfafawa. Photoinitiator yana da halaye na sauri, kare muhalli da ceton makamashi.

Kwayoyin ƙaddamarwa na iya ɗaukar haske a cikin yankin ultraviolet (250 ~ 400 nm) ko yanki mai gani (400 ~ 800 nm). Bayan shayar da makamashin haske kai tsaye ko a kaikaice, kwayoyin halitta masu farawa suna canzawa daga yanayin ƙasa zuwa yanayin farin ciki na singlet, sa'an nan kuma zuwa yanayin mai farin ciki sau uku ta hanyar tsaka-tsakin tsarin.

Bayan jihar singlet ko sau uku yana jin daɗi ta hanyar maganin sinadarai na monomolecular ko bimolecular, gutsuttsuran aiki waɗanda zasu iya fara polymerization na monomer na iya zama radicals kyauta, cations, anions, da sauransu.

Dangane da tsarin ƙaddamarwa daban-daban, ana iya raba masu ɗaukar hoto zuwa radical polymerization photoinitiator da cationic photoinitiator, daga cikinsu akwai mafi yawan amfani da na'urar polymerization.