Cov dej-raws li (VOC & HAPs) dawb txheej tuaj yeem npaj tau los ntawm cov kua aliphatic epoxy thiab nqaim polymerized cappropone polyols thiab tuaj yeem siv nrog cov khoom siv sib xyaw thiab muaj peev xwm los hloov cov hmoov txheej txheej. aliphatic epoxy kua txheej? Suav epoxy resin kev lag luam koom haum kws tshaj lij tau qhia tshwj xeeb ob peb hnub dhau los.
Cov cuab yeej siv yooj yim tsim nyog rau cov hmoov txheej txheej tshiab tuaj yeem zam tau los ntawm kev siv cov khoom siv tshuaj pleev ib ce.Cov txheej txheem no tuaj yeem hloov kho los ntawm diluting lawv nrog dej lossis los ntawm cov dej ua kom tuab nrog cov cellulose thickeners.Nrog cov pa diglycidyl ether ntawm bisphenol A (bpa) resin, alicyclic epoxy muaj ntau yam hauv qab no: qhov sib txawv ntawm A raws li cov saw tseem ceeb. aliphatic, cov tshuaj tiv thaiv nrog cov kua qaub sai, tab sis nrog amine / amides epoxy curing agents feem ntau siv tsis tshua muaj tshwm sim, tsis muaj chlorine, viscosity ntawm 350 centipoise thiab diglycidyl ether ntawm bisphenol A (bpa) resin li 11000 centipoise, tib lub sijhawm. Nws kuj muaj huab cua tiv thaiv zoo heev.Cov ntawv thov uas tsis tshua muaj viscosity aliphatic epoxy hauv cationic UV txheej tau nce ntau ntxiv.Muaj ntau cov ntaub ntawv qhia txog kev npaj thiab cov khoom ntawm hom no ntawm 100% cov txheej txheem txheej tsis muaj "VA", tab sis muaj ob peb cov ntaub ntawv ntxaws ntxaws ntawm nws daim ntawv thov hauv thermal curing coatings.Raws li cov hauv paus ntsiab lus, cationic UV txheej txheej kev paub-yuav ua li cas kuj tuaj yeem ua tau. siv rau thermal curing system, tab sis ob qho tib si kuj muaj qhov sib txawv xws li UV txheej feem ntau tsis siv tshuaj tsuag, yog li kev tsim kho viscosity siab dua li txau cov txheej txheem thermal curing, hauv hom ci cationic txheej dej tuaj yeem siv ua VOC diluent.
Cepolactone polyols tau siv los ua cov diluents zoo rau cov kuab tshuaj raws li txheej txheej thiab tuaj yeem ua kom nrawm ntawm cationic UV txheej.Cov pab pawg hydroxyl ntawm cov polyols hauv cationic UV txheej tuaj yeem tsis tsuas yog ua kom lub sijhawm kho, tab sis kuj ua rau qee qhov kev kho kom zoo rau cov av noo.Nyob rau hauv lub tshav kub curing txheej vim cov av qis hauv qhov cub, cov av noo tsis cuam tshuam kev kho. ntawm polyols tsub kom lub siab ntev ntawm dej, thiaj li hais tias dej yuav siv tau raws li ib tug VOC-dawb thinner nyob rau hauv cov xim formulations muaj li ntawm aliphatic epoxies thiab polyols, uas yog tiag tiag siab khoom organic coatings diluted nrog dej. Dej dilution muaj ob qhov zoo: tsawg viscosity hauv qhov tsis muaj VOC, thiab kev siv cov xim zoo nkauj thiab cov xim zoo nkauj los tiv thaiv kev dai thiab rheological tswj.Vim tias txhua yam hauv cov mis tsuas yog ib feem miscible nrog dej, cov dej uas tuaj yeem nqus tau yog txwv.Yuav tsum tau saib xyuas kom tsis txhob ntxiv dej ntau dhau los ua rau theem sib cais.
Cellulosic thickeners muaj txiaj ntsig zoo hauv cov txheej txheem dej, tab sis nws tsis paub meej tias lawv puas muaj txiaj ntsig hauv 100% khoom, dej-diluted aliphatic epoxy txheej. .Qhov kev tshawb xyuas ntawm ntau yam thickeners qhia tau hais tias cellulose thickeners muaj cov khoom zoo tshaj plaws.Thaum rhuab mus rau 40 ~ 60 ℃, qhov zoo tshaj plaws tsos ntawm cov yeeb yaj kiab tuaj yeem tau txais los ntawm kev siv rab phom tsuag.Qhov kev tsim kho qis ua rau cov yeeb yaj kiab kho tau tsim ntau cov txiv kab ntxwv tev.China epoxy resin kev lag luam koom haum cov kws tshaj lij tau hais tias lub ntsiab kom zoo dua ntawm cov hmoov txheej yog coated nrog kev ua haujlwm siab, kev ua haujlwm siab yog tsuas yog los ntawm kev rov qab los ntawm cov hmoov kom ua tiav, rau cov hmoov txheej sib npaug. Cov txheej txheem ua kua no xav tau qee txoj hauv kev kom rov qab tau yoov cov xim.Vim cov xim pleev xim tau piav qhia ntawm no tsis muaj cov kuab tshuaj organic kom rov qab tau yooj yim dua, cov dej poob hauv cov txheej txheem rov qab tuaj yeem kho tau yooj yim los ntawm kev ntsuas cov hluav taws xob conductivity thaum tsim nyog, txuag lub zog los ntawm Yuav tsum tau ua kom qis qis qis dua piv rau qhov kub siab dua qhov yuav tsum tau ua rau cov hmoov txheej txheej.Lwm txoj kev uas tau soj ntsuam yog tshuaj tsuag anhydrous epoxies, polyols, thiab pigments nrog "Unicarb" txoj kev, uas yog ntau npaum li cov hmoov txheej.Yog tias tsis muaj VOC dawb txheej yuav tsum tau, tsuas yog ntxiv cov kuab tshuaj rau hauv cov mis.
Hais txog daim ntawv qhia, Tuam Tshoj epoxy resin kev lag luam koom haum kws tshaj lij hais tias, rau cationic curing vim hais tias cov alkali yuav tsum tsis txhob kho, yog li tag nrho cov additives thiab rheological tswj cov neeg sawv cev yuav tsum tsis txhob muaj alkaline, alkaline pigments thiab amines kho pigments yuav inhibit curing.Alkalescent yog damine pigments yuav kuj inhibit cationic curing, alkaline pigments thiab additives nyob rau hauv cationic curing coatings tsis tuaj yeem siv, kev kho yog nyob ntawm tus catalyst FC-520 nyob rau hauv ib qho me me ntawm amine sealant volatilization, yog tias zaj duab xis tuab dhau los yog qhov cub tsis muaj cua, cov amine tsis tuaj yeem raug tshem tawm tag nrho ntawm cov yeeb yaj kiab thiab inhibit curing.Viscosity nce nrog qhov nce ntawm polyols branched degree nce: dibasic cawv ntau dua peb lossis plaub yuan cov nyiaj tau los qis dua viscosity ntawm cov xim, cawv thiab glycol qhia qhov yuav tsum tau nce tus nqi ntawm epoxy ( R) tuaj yeem tau txais los ntawm cov txheej txheem nyuaj, kev siv ntau ntawm epoxy corrosion tuaj yeem txhim kho, qhov nce ntawm cov tshuaj catalyst tuaj yeem ua kom nrawm nrawm tab sis kuj tuaj yeem txo qhov corrosion, molar ratio ntawm epoxy thiab hydroxyl R muaj kev cuam tshuam tseem ceeb ntawm kev kho ceev. .
Txawm li cas los xij, alicyclic epoxy nrog caprolactone polyols tsis tshua muaj viscosity thiab txawm tias tsis muaj VOC txheej, cov txheej tuaj yeem diluted nrog dej los tsuag viscosity, cellulose thickener tuaj yeem muab dej dilute ntawm 100% khoom epoxy thiab polyols txheej kom zoo tiv thaiv sagging, txheej txheem ntawm kev kho ceev. yog txiav txim los ntawm cov nram qab no variables: lub molar ratio ntawm epoxy thiab hydroxyl, multivariate cawv thiab epoxy functionality, npaum li cas ntawm cov catalyst thiab curing kub, cov mis yuav yooj yim siv nyob rau hauv kev npaj cov xim, vim hais tias hom txheej no rau cationic. curing yooj yim xim thiab substrate tuaj yeem inhibit curing.
Post lub sij hawm: Apr-06-2021