Light initiator

Light initiator

Muiyo inorapika sisitimu, inosanganisira UV glue, UV coating, UV inki, nezvimwewo, shanduko yemakemikari inoitika mushure mekugamuchira kana kutora ekunze simba, uye inoora kuita emahara radicals kana cations, nekudaro ichikonzera iyo polymerization reaction.

Photoinitiators zvinhu zvinogona kuburitsa mahara radicals uye kuwedzera kutanga polymerization nekuvhenekerwa.Mushure mekunge mamwe mamonomeri avhenekerwa, anotora mafotoni uye anoita mamiriro ekunakidzwa M* : M+ HV →M*;

Mushure mekuita homolysis yemorekuru rakaitwa, iyo yemahara radical M*→ R·+R '· inogadzirwa, uyezve monomerization inotangwa kugadzira iyo polima.

Tekinoroji yekurapa tekinoroji ndiyo itsva Kuchengetedza Kwemagetsi uye Kuchengetedza Kwemamiriro ekunze tekinoroji, inovhenekerwa nechiedza cheultraviolet (UV), electron beam (EB), mwenje we infrared, mwenje unooneka, laser, kemikari fluorescence, nezvimwewo, uye inosangana zvizere ne "5E" maitiro: Kushanda, Kugonesa, Zvehupfumi, Kuchengetedza Simba, uye Kunoshamwaridzana Nezvakatipoteredza. Saka, inozivikanwa se "Green Technology".

Photoinitiator ndechimwe chezvakakosha zvinomisikidza zvinonamirwa, izvo zvinotora basa rekuita mukurapa chiyero.

Kana iyo photoinitiator ichivhenekerwa nechiedza che ultraviolet, inotora simba rechiedza uye inotsemuka kuita maviri anoshanda emahara radicals, ayo anotanga cheni polymerization yephotosensitive resin uye inoshanda diluent, ichiita iyo inonamira-yakabatana uye yakasimba. Iyo photoinitiator ine maitiro ekukurumidza, kuchengetedza kwezvakatipoteredza uye kuchengetedza simba.

Iwo mamorekuru ekutanga anogona kutora mwenje munharaunda ye ultraviolet (250 ~ 400 nm) kana nharaunda inooneka (400 ~ 800 nm). Mushure mekutora simba rechiedza zvakananga kana zvisina kunanga, mamorekuru ekutanga anochinja kubva pasi pasi kuenda kune inonakidza singlet state, uyezve kune inonakidza katatu nyika kuburikidza neiyo intersystem shanduko.

Mushure mekunge iyo singlet kana katatu nyika yanakidzwa kuburikidza ne monomolecular kana bimolecular kemikari reaction, izvo zvinoshanda zvimedu zvinogona kutanga monomerization yepolymerization inogona kuve yemahara radicals, cations, anions, nezvimwe.

Zvinoenderana neakasiyana ekutanga maitiro, mafotoinitiators anogona kupatsanurwa kuita yemahara radical polymerization photoinitiator uye cationic photoinitiator, pakati peiyo yemahara radical polymerization photoinitiator ndiyo inonyanya kushandiswa.

 


Nguva yekutumira: Kubvumbi-08-2021