In 1919, Hans John (1891–1942) ntawm Prague, Czechoslovakia, tau txais thawj patent rau UF resin. Urea-formaldehyde yog qhov teeb meem ntawm kev txiav txim los ntawm European Tsev Hais Plaub Kev Ncaj Ncees (tam sim no CJEU) ntawm 5 Lub Ob Hlis 1963, Case 26–62 Van Gend & Loos v Netherlands Inland Revenue Administration.
Urea formaldehyde tuaj qhov twg?
Urea-formaldehyde resin, ib chav kawm ntawm cov khoom siv hluavtaws tau los ntawm cov tshuaj sib xyaw ua ke ntawm urea (cov khoom siv lead ua tau los ntawm ammonia)thiab formaldehyde (cov roj muaj zog heev tau txais los ntawm methane).
Dab tsi yog qee qhov kev siv tseem ceeb ntawm urea formaldehyde resin?
Urea-formaldehyde (UF) resin, yog ib qho tseem ceeb tshaj plaws formaldehyde resin adhesives, yog cov khoom siv polymeric condensation ntawm formaldehyde nrog urea, thiab tau siv dav rau tsim cov ntoo ua vaj huam sib luag, xws li plywood, particleboard, thiab fiberboard.
Urea resin yog dab tsi?
Lub workhorse ntawm amino resin thev naus laus zis, urea resins yog siv feem ntau hauv kev lag luam khoom ntoo thiab muaj ntau yam, siv tau zoo, ua pov thawj. Cov txheej txheem thermosetting polymers no feem ntau yog ua los ntawm urea thiab formaldehyde, nrog formaldehyde ua tus ntoo khaub lig-linker.
Dab tsi yog qhov phom sij ntawm urea formaldehyde resin?
Formaldehyde yog muaj tshuaj lom rau tib neeg, tsis hais txog kev noj haus. Txawm luv-Lub sij hawm raug formaldehyde irritates lub qhov muag, ua rau mob, liab, tsis pom kev thiab dej loj heev. Nws tuaj yeem ua rau lub qhov ntswg thiab caj pas, ua rau txham, mob, hnoos, ua tsis taus pa, mob taub hau, thiab xeev siab.
