Waterborne (WB) UV chemistry tau pom tias muaj kev loj hlob tseem ceeb hauv kev lag luam sab hauv kev lag luam ntoo vim tias cov thev naus laus zis muab kev ua tau zoo, tsis muaj kuab paug emissions thiab nce kev ua tau zoo. UV txheej txheej txheej muab cov neeg siv kawg cov txiaj ntsig ntawm cov tshuaj lom neeg zoo thiab khawb tsis kam, tiv thaiv zoo heev, VOCs qis heev thiab cov cuab yeej siv me me nrog qhov chaw cia tsawg dua. Cov tshuab no muaj cov khoom zoo sib piv nrog ob lub ntsiab lus urethane yam tsis muaj teeb meem ntawm cov teeb meem cuam tshuam thiab kev txhawj xeeb txog lub neej. Cov txheej txheem tag nrho yog tus nqi zoo vim tias muaj kev tsim khoom nrawm dua thiab cov nqi hluav taws xob qis dua. Cov txiaj ntsig zoo ib yam no tuaj yeem ua tau zoo rau cov khoom siv sab nrauv siv nrog rau qhov rais thiab qhov rooj thav duab, siding thiab lwm yam millwork. Cov kev lag luam no feem ntau siv cov acrylic emulsions thiab polyurethane dispersions vim lawv muaj gloss thiab xim tuav, thiab ua kom pom kev zoo dua. Hauv txoj kev tshawb no, polyurethane-acrylic resins nrog UV ua haujlwm tau raug soj ntsuam raws li kev lag luam tshwj xeeb rau ob qho tib si sab hauv thiab sab nrauv siv ntoo.
Peb hom tshuaj hnyav-raws li txheej yog feem ntau siv hauv kev siv ntoo. Nitrocellulose lacquer feem ntau yog cov khoom siv qis ntawm nitrocellulose thiab roj los yog roj-raws li alkyds. Cov coatings no tau qhuav sai thiab muaj peev xwm gloss siab. Lawv feem ntau yog siv rau hauv daim ntawv thov rooj tog zaum. Lawv muaj qhov tsis zoo ntawm yellowing nrog lub sijhawm thiab tuaj yeem ua nkig. Lawv kuj muaj cov tshuaj tsis zoo. Nitrocellulose lacquers muaj VOCs siab heev, feem ntau ntawm 500 g / L lossis siab dua. Pre-catalyzed lacquers yog sib xyaw ntawm nitrocellulose, roj los yog roj-raws li alkyds, plasticizers thiab urea-formaldehyde. Lawv siv cov tsis muaj zog acid catalyst xws li butyl acid phosphate. Cov txheej txheem no muaj lub neej txee ntawm kwv yees li plaub lub hlis. Lawv siv rau hauv chaw ua haujlwm, chaw ua haujlwm thiab cov rooj tog zaum hauv tsev. Pre-catalyzed lacquers muaj tshuaj tiv thaiv zoo dua li nitrocellulose lacquers. Lawv kuj muaj VOCs siab heev. Conversion varnishes yog sib xyaw ntawm cov roj-raws li alkyds, urea formaldehyde thiab melamine. Lawv siv lub zog acid catalyst xws li p-toluene sulfonic acid. Lawv muaj lub neej lauj kaub ntawm 24 mus rau 48 teev. Lawv yog siv nyob rau hauv chav ua noj txee, chaw ua hauj lwm rooj tog thiab tej rooj tog zaum siv. Conversion varnishes muaj cov khoom zoo tshaj plaws ntawm peb hom kev hnyav-raws li txheej txheej feem ntau siv rau kev lag luam ntoo. Lawv muaj VOCs siab heev thiab formaldehyde emissions.
Dej-raws li tus kheej-crosslinking acrylic emulsions thiab polyurethane dispersions tuaj yeem yog lwm txoj hauv kev zoo rau cov khoom hnyav raws li cov khoom siv ntoo. Acrylic emulsions muab tshuaj zoo heev thiab thaiv tsis kam, zoo dua hardness qhov tseem ceeb, zoo heev durability thiab weatherability, thiab txhim kho adhesion rau cov tsis-porous nto. Lawv muaj lub sijhawm qhuav sai, ua rau lub txee, rooj tog zaum lossis cov chaw tsim khoom tsim los tswj cov khoom sai tom qab thov. PUDs muaj kev tiv thaiv zoo heev, ua kom yooj yim, thiab khawb thiab ua haujlwm. Lawv yog cov zoo sib koom tes nrog acrylic emulsions los txhim kho cov khoom siv kho tshuab. Ob qho tib si acrylic emulsions thiab PUDs tuaj yeem hnov mob nrog crosslinking chemistry xws li polyisocyanates, polyaziridine lossis carbodiimides los ua 2K txheej nrog cov khoom txhim kho.
Waterborne UV-curable coatings tau dhau los ua kev xaiv nrov rau kev siv ntoo. Chav ua noj txee thiab rooj tog manufacturers xaiv cov txheej txheem no vim lawv muaj kev ua haujlwm zoo thiab cov khoom siv kho tshuab, cov khoom siv zoo heev thiab cov kuab tshuaj tsawg heev. WB UV txheej muaj kev tiv thaiv zoo heev tam sim ntawd tom qab kho, uas tso cai rau cov khoom siv coated yuav tsum tau ntim, ntim thiab xa tawm ntawm cov kab ntau lawm uas tsis muaj sijhawm nyob rau kev txhim kho hardness. Kev txhim kho hardness hauv WB UV txheej yog qhov ua tau zoo thiab tshwm sim hauv vib nas this. Cov tshuaj lom neeg thiab stain tsis kam ntawm WB UV txheej yog superior rau cov kuab tshuaj hloov dua siab tshiab.
WB UV txheej muaj ntau yam zoo. Thaum 100%-khoom UV oligomers feem ntau yog siab viscosity thiab yuav tsum tau diluted nrog reactive diluents, WB UV PUDs yog tsawg nyob rau hauv viscosity, thiab lub viscosity yuav tsum tau kho nrog ib txwm WB rheology modifiers. WB UV PUDs muaj qhov hnyav hnyav molecular thiab tsis tsim qhov hnyav molecular li lawv kho tau zoo li 100% cov txheej txheem UV. Vim tias lawv muaj me me los yog tsis muaj shrinkage thaum lawv kho, WB UV PUDs muaj adhesion zoo heev rau ntau substrates. Lub gloss ntawm cov coatings no yog yooj yim tswj nrog ib txwm matting agents. Cov polymers no tuaj yeem nyuaj heev tab sis kuj hloov tau yooj yim, ua rau lawv cov neeg sib tw zoo tshaj plaws rau sab nrauv ntoo txheej.
Post lub sij hawm: Mar-07-2024
