Moqali oa leseli

Moqali oa leseli

Sistimi e ka phekolehang, ho kenyeletsoa sekhomaretsi sa UV, ho roala ha UV, enke ea UV, joalo-joalo, liphetoho tsa lik'hemik'hale li etsahala kamora ho amohela kapa ho monya matla a kantle, ebe li bola ho ba li-radicals tsa mahala kapa cations, ka hona li baka karabelo ea polymerization.

Li-photoinitiators ke lintho tse ka hlahisang li-radicals tsa mahala le ho tsoela pele ho qala polymerization ka ho bonesa.Ka mor'a hore li-monomer tse ling li bonesitsoe, li monya photon ebe li etsa boemo ba thabo M* : M+ HV →M*;

Ka mor'a homolysis ea molek'hule e kentsoeng, ho hlahisoa radical mahala M*→ R·+R '·, 'me joale polymerization ea monomer e qalisoa ho etsa polymer.

Theknoloji ea ho folisa mahlaseli ke theknoloji e ncha ea ho boloka Matla le ts'ireletso ea Tikoloho, e khantšitsoeng ke lebone la ultraviolet (UV), lebone la elektronike (EB), lebone la infrared, leseli le bonahalang, laser, lik'hemik'hale tsa fluorescence, joalo-joalo, 'me li kopana ka botlalo le "5E" litšoaneleho: E sebetsang hantle, e nolofalletsang, ea moruo, ea ho boloka matla, le ea botsoalle ea tikoloho. Ka hona, e tsejoa e le "Green Technology".

Photoinitiator ke e 'ngoe ea likarolo tsa bohlokoa tsa likhomaretsi tse ka phekolehang, tse bapalang karolo ea bohlokoa molemong oa ho folisa.

Ha photoinitiator e khantšitsoe ke khanya ea ultraviolet, e monya matla a leseli 'me e arola li-radicals tse peli tse sebetsang, tse qalang polymerization ea ketane ea resin ea photosensitive le diluent e sebetsang, ho etsa hore sekhomaretsi se kopane le ho tiisa. Photoinitiator e na le litšobotsi tsa ho potlaka, ho sireletsa tikoloho le ho boloka matla.

Limolek'hule tsa initiator li ka monya leseli sebakeng sa ultraviolet (250 ~ 400 nm) kapa sebakeng se bonahalang (400 ~ 800 nm). Ka mor'a ho monya matla a khanya ka ho toba kapa ka tsela e sa tobang, limolek'hule tsa initiator li fetoha ho tloha fatše ho ea sebakeng se thabileng sa singlet, ebe ho ea sebakeng se thabisang sa triplet ka phetoho ea intersystem.

Kamora hore boemo ba singlet kapa triplet e thabele karabelo ea lik'hemik'hale tsa monomolecular kapa bimolecular, likhechana tse sebetsang tse ka qalang polymerization ea monomer e ka ba li-radicals tsa mahala, cations, anions, joalo-joalo.

Ho ea ka mekhoa e fapaneng ea ho qala, li-photoinitiators li ka aroloa ka photoinitiator ea mahala ea polymerization le cationic photoinitiator, eo har'a eona e sebelisoang haholo ka ho fetisisa ea radical polymerization photoinitiator.