Mfundo yoyambira yaukadaulo wakuchiritsa kwa UV

Kuchiritsa kwa UV kumatanthauza kuchiritsa kwa UV munjira yochiritsa ma radiation (otchedwa machiritso a UV).Ukadaulo wochiritsa ma radiation ndiukadaulo watsopano wobiriwira, womwe umatanthawuza njira yopangira ma polymerization pompopompo ndi kuchiritsa kolumikizana kwamadzimadzi kudzera mu kuwala kwa ultraviolet, mtengo wa elekitironi ndi kuwala kwa r-ray.Zili ndi ubwino wopulumutsa mphamvu, kuyendetsa bwino kwambiri, kuphimba bwino kwambiri, kupulumutsa guluu, chitetezo ndi kuteteza chilengedwe, kuwala kwakukulu, nthawi yayitali, ndi zina zotero. Mwala wachilengedwe umakhala ndi zolakwika zina, monga maenje, ming'alu, mbale zosagwirizana, ndi zina zotero. (zonse za granite ndi marble zilipo).

Makhalidwe a njira yomanga:

1) Kuchita bwino kwa zokutira: Kuphimba kwa UV kumakhala ndi ntchito yabwino kwambiri, gloss yayikulu, kuuma kwakukulu, komanso kukana kwamankhwala.Mogwira bwino kukonza khalidwe mabowo mwala.

2) Chitetezo ndi chitetezo cha chilengedwe: Chifukwa kuthamanga kwa machiritso a UV kumathamanga kwambiri, kutulutsa kwa zosungunulira za organic mumlengalenga kumachepetsedwa kukhala ziro, zomwe ndizotetezeka komanso zachilengedwe.

Ndondomeko ya ndondomeko:

Zovala za UV ndi zokutira zochiritsika ndi UV.Pambuyo poyatsidwa ndi kuwala kwa UV, chopangira fotonitiator chimatengera mphamvu ya UV ndikuyatsidwa.Ma electron omwe ali kunja kwa mamolekyu ake amalumphira ndi kupanga pakati pa nthawi yochepa kwambiri.Ndiye likulu yogwira ntchito ndi unsaturated magulu unsaturated mu utomoni, kuchititsa zomangira iwiri mu kuwala-emitting machiritso utomoni ndi yogwira diluent mamolekyu kuti kulumikizidwa, kuchititsa kupitiriza polymerization anachita, kuti kuwoloka kugwirizana wina ndi mzake kupanga kanema.Kafukufuku wamankhwala kinetics akuwonetsa kuti makina a UV kuchiritsa zokutira za UV ndi polymerization yaulere yama unyolo.Choyamba, siteji ya photoinitiation;Yachiwiri ndi chain growth reaction stage.Panthawiyi, pamene kukula kwa unyolo kumapitirira, dongosololi lidzalumikizidwa ndi kulimba kukhala filimu;Z post chain radicals imamaliza kutha kwa unyolo kudzera pakuphatikizana kapena kusagwirizana.

1. Oligomer

Prepolymer, yomwe imadziwikanso kuti oligomer kapena resin, ndi mafupa a guluu wa UV.Amatanthawuza makamaka gulu la ma polima a molekyulu okhala ndi ma unsaturated pawiri chomangira.Imagwiranso ntchito ndikupanga thupi lochiritsira lolumikizana pambuyo pakukula, lomwe limapangitsa kuti zinthu zikhale ndi zofunikira zakuthupi ndi zamankhwala.Mwachitsanzo, mamasukidwe akayendedwe, kulimba mphamvu, kukameta ubweya mphamvu, kuuma ndi kutsatira.

2. Monomer

Monomers, wotchedwanso zotakasika diluents, makamaka mamolekyu ang'onoang'ono munali imodzi kapena kuposa awiri zomangira, amene makamaka ntchito kusintha mamasukidwe akayendedwe a dongosolo ndi kutenga nawo mbali polymerization, komanso zimakhudza mlingo polymerization ndi katundu chuma.Ma monomers atha kugawidwa m'ma monofunctional monomers, ma monomers osagwira ntchito ndi ma monomers amitundu yambiri malinga ndi kuchuluka kwa magwiridwe antchito.Monofunctional monomers ndi opindulitsa kumapangitsanso kusinthasintha ndi adhesion wa colloid;Difunctional monomers ndi multifunctional monomers sikuti amangokhala ngati diluents, komanso amachita ngati wothandizira mtanda.Amakhudzidwa kwambiri ndi kuuma, kulimba ndi mphamvu.

3. Photoinitiators)

Ma Photoinitiators ndi apakati omwe amatha kuyamwa ma ultraviolet kapena kuwala kowonekera ndikupanga polymerization kuyambitsa luso kudzera mukusintha kwamankhwala.Ndizigawo zazikulu za dongosolo la photopolymerization ndipo zimagwira gawo lalikulu pakukhudzidwa (kuchiritsa) kwa njira yochiritsira ya UV.Ma Photoinitiators amaphatikiza ma radical photoinitiators aulere ndi ma cationic photoinitiators, omwe amagwiritsidwa ntchito ku machitidwe aulere ndi machitidwe a cationic motsatana.