UV curing yog hais txog UV curing nyob rau hauv hluav taws xob curing system (hu ua UV curing).Radiation curing technology yog ib qho tshiab ntsuab technology, uas yog hais txog cov txheej txheem ntawm instant polymerization thiab cross-linking curing ntawm cov kua theem system los ntawm ultraviolet lub teeb, electron beam thiab r-ray irradiation.Nws muaj qhov zoo ntawm kev txuag hluav taws xob, kev ua haujlwm siab, kev ua haujlwm zoo heev, kev txuag cov kua nplaum, kev nyab xeeb thiab kev tiv thaiv ib puag ncig, kev ci ntsa iab, lub sijhawm ntev, thiab lwm yam. Lub pob zeb ntuj nws tus kheej muaj qee qhov tsis xws luag, xws li pits, tawg, daim hlau tsis sib xws, thiab lwm yam. (ob qho tib si granite thiab marble muaj).
Txoj kev tsim kho yam ntxwv:
1) Cov txheej txheem zoo heev: UV curing txheej muaj kev ua tau zoo, siab gloss, siab hardness, thiab cov tshuaj tiv thaiv zoo.Txhim kho qhov zoo ntawm cov pob zeb qhov.
2) Kev nyab xeeb thiab kev tiv thaiv ib puag ncig: Vim tias UV curing ceev ceev heev, emission ntawm organic solvents nyob rau hauv cov huab cua yog txo mus rau xoom, uas yog kev nyab xeeb thiab ib puag ncig tus phooj ywg.
Txheej txheem txheej txheem:
UV txheej yog UV curable txheej.Tom qab UV curable coatings yog irradiated los ntawm UV lub teeb, lub photoinitiator thawj absorbs lub UV hluav taws xob lub zog thiab yog activated.Cov electrons nyob rau hauv txheej txheej ntawm nws cov molecules dhia thiab tsim lub active chaw nyob rau hauv ib tug luv luv lub sij hawm.Tom qab ntawd lub chaw nquag ua haujlwm nrog cov pab pawg tsis txaus ntseeg hauv cov resin, ua rau ob daim ntawv cog lus nyob rau hauv lub teeb-emitting curing resin thiab cov active diluent molecules yuav tsum tau txiav, uas ua rau ib tug tsis tu ncua polymerization cov tshuaj tiv thaiv, thiaj li mus hla kev sib txuas los tsim ib tug active diluent molecules. zaj duab xis.Kev tshawb fawb ntawm cov tshuaj kinetics qhia tau hais tias cov txheej txheem ntawm UV kho UV txheej yog dawb radical saw polymerization.Ua ntej, theem photoinitiation;Qhov thib ob yog cov saw loj hlob cov tshuaj tiv thaiv theem.Nyob rau theem no, raws li kev loj hlob ntawm cov saw hlau txuas ntxiv mus, lub kaw lus yuav raug sib txuas thiab ua kom ruaj khov rau hauv zaj duab xis;Z post chain radicals ua tiav cov saw hlau txiav los ntawm kev sib txuas lossis tsis sib xws.
1. Oligomer
Prepolymer, tseem hu ua oligomer lossis resin, yog cov pob txha ntawm UV kua nplaum.Nws feem ntau yog hais txog ib chav kawm ntawm molecular polymers nrog unsaturated ob daim ntawv cog lus.Nws ntxiv reacts thiab tsim cross-linked curing lub cev tom qab nthuav, uas endows cov ntaub ntawv nrog lub cev thiab tshuaj lom neeg zog.Piv txwv li, viscosity, tensile zog, shear zog, hardness thiab ua raws li.
2. Monomer
Monomers, tseem hu ua reactive diluents, feem ntau me me molecules uas muaj ib los yog ntau tshaj ob daim ntawv cog lus, uas yog tsuas yog siv los kho cov viscosity ntawm lub system thiab koom nyob rau hauv polymerization, tab sis kuj muaj feem xyuam rau lub polymerization tus nqi thiab cov khoom siv.Monomers tuaj yeem muab faib ua monofunctional monomers, bifunctional monomers thiab multifunctional monomers raws li qib ntawm kev ua haujlwm.Monofunctional monomers muaj txiaj ntsig los txhim kho qhov yooj yim thiab adhesion ntawm colloid;Difunctional monomers thiab multifunctional monomers tsis tsuas yog ua raws li diluents, tab sis kuj ua raws li tus neeg sawv cev sib txuas.Lawv muaj kev cuam tshuam tseem ceeb rau hardness, toughness thiab lub zog.
3. Photoinitiators)
Photoinitiators yog cov nquag nruab nrab uas tuaj yeem nqus tau ultraviolet lossis pom lub teeb thiab tsim cov polymerization pib muaj peev xwm los ntawm kev hloov tshuaj.Lawv yog cov khoom tseem ceeb ntawm cov txheej txheem photopolymerization thiab ua lub luag haujlwm txiav txim siab hauv qhov rhiab heev (kho tus nqi) ntawm UV curing system.Photoinitiators suav nrog dawb radical photoinitiators thiab cationic photoinitiators, uas yog siv rau dawb radical systems thiab cationic systems feem.
Post lub sij hawm: Nov-24-2022