Bilow iftiin

Bilow iftiin

Nidaamka sawir-qaadista, oo ay ku jiraan xabagta UV, daahan UV, khad UV, iwm., isbeddellada kiimikadu waxay dhacaan ka dib marka la helo ama la nuugo tamarta dibadda, waxayna u jajabaan xagjirnimo bilaash ah ama cations, sidaas darteed kicinta falcelinta polymerization.

Photoinitiators waa walxo soo saari kara xag-jiryo xor ah oo sii bilaabi kara polymerization iftiin.Ka dib markii monomer-yada qaarkood iftiimiyaan, waxay nuugaan sawir-qaadayaasha waxayna sameeyaan xaalad faraxsan M* : M+ HV →M*;

Ka dib homolysis ee molecule firfircoon, xagjirka xorta ah ee M * → R · + R '· ayaa la soo saaraa, ka dibna monomer polymerization ayaa la bilaabay si loo sameeyo polymer-ka.

Tiknoolajiyada daweynta shucaaca waa tignoolajiyada cusub ee Badbaadinta Tamarta iyo Ilaalinta Deegaanka, kaas oo lagu shido iftiinka ultraviolet (UV), iftiinka elektarooniga ah (EB), iftiinka infrared, iftiinka muuqda, laysarka, fluorescence kiimikaad, iwm, oo si buuxda ula kulma "5E" Tilmaamaha: Waxtarka leh, Awood-siinta, Dhaqaale, Badbaadinta Tamarta, iyo Saaxiibtinimada Deegaanka. Sidaa darteed, waxaa loo yaqaan "Technology Green".

Photoinitiator waa mid ka mid ah qaybaha muhiimka ah ee xabagta la sawiri karo, taas oo door muhiim ah ka ciyaarta daaweynta heerka.

Marka sawir-qaaduhu uu iftiimiyo iftiinka ultraviolet, waxay nuugtaa tamarta iftiinka waxayna u kala qaybsantaa laba qaybood oo bilaash ah oo firfircoon, taas oo bilaabeysa silsiladda polymerization ee xajinta sawir-qaadista iyo dareeraha firfircoon, taasoo ka dhigaysa koollada iskutallaabta iyo adkeynta. Photoinitiator-ku wuxuu leeyahay sifooyinka degdega ah, ilaalinta deegaanka iyo badbaadinta tamarta.

Unugyada bilawga ah waxay nuugi karaan iftiinka gobolka ultraviolet (250 ~ 400 nm) ama gobolka muuqda (400 ~ 800 nm). Ka dib markii ay nuugaan tamarta iftiinka si toos ah ama si dadban, molecules-ka bilawga ah waxay ka guuraan gobolka dhulka una guuraan xaalad xiiso leh oo keli ah, ka dibna waxay u gudbaan gobolka xiisaha leh ee saddex-geesoodka ah iyada oo loo marayo kala-guurka nidaamka isdhexgalka.

Ka dib markii gobolka kali ama saddex-geesoodka ah uu ku faraxsan yahay falcelinta kiimikada monomolecular ama bimolecular, jajabyada firfircoon ee bilaabi kara monomer polymerization waxay noqon karaan xag-jiryo xor ah, cations, anions, iwm.

Marka loo eego habka bilowga ah ee kala duwan, sawir-qaadayaasha waxaa loo qaybin karaa sawir-qaade-soo-saarka xorta ah ee polymerization photoinitiator iyo sawir-qaade cationic, kuwaas oo ka mid ah kuwa ugu isticmaalka badan.