Cov khoom lag luam cellulose tau muab los ntawm cov paj rwb ntuj lossis ntoo pulp los ntawm etherification. Cov khoom sib txawv ntawm cov cellulose siv cov khoom sib txawv etherifying. Hypromellose HPMC siv lwm hom etherifying agents (chloroform thiab 1,2-epoxypropane), thaum hydroxyethyl cellulose HEC siv Oxirane etherifying agents. Hydroxyethyl cellulose tuaj yeem siv los ua cov thickener hauv cov xim pob zeb tiag tiag thiab cov xim latex. Vim hais tias ntawm nws cov loj npaum li cas ntawm tag nrho, tshwj xeeb lub ntiajteb txawj nqus, nag lossis daus, nws yuav tsum tau ntxiv thickening tus neeg saib xyuas kom nws viscosity, thiaj li yuav ua tau raws li cov kev xav tau ntawm kev tsim kho tshuaj tsuag viscosity, thiab txhim kho nws cia stability, thiab ua tau ib tug tej yam lub zog. Txhawm rau ua tiav lub zog zoo, dej tsis kam thiab huab cua tsis kam, kev xaiv cov khoom siv raw thiab kev tsim qauv yog qhov tseem ceeb heev.
Feem ntau, tus nqi ntawm cov pob zeb zoo tiag tiag xim emulsion yuav siab dua. Piv txwv li, ib tuj ntawm cov xim pob zeb tiag tiag yuav muaj 300 kg ntawm ntshiab acrylic emulsion thiab 650 kg ntawm ntuj xim pob zeb xuab zeb. Thaum cov ntsiab lus ntawm emulsion yog 50%, qhov ntim ntawm 300 kg emulsion tom qab ziab yog li 150 litres, 650 Kg xuab zeb yog li 228 liters. Qhov ntawd yog hais tias, lub sij hawm no PVC (pigment ntim concentration) ntawm cov xim pob zeb tiag tiag yog 60%, vim hais tias cov xim ntawm cov xuab zeb yog cov loj thiab tsis sib xws, nyob rau hauv cov xwm txheej ntawm ib qho kev faib me me, tom qab ziab. cov xim pob zeb tiag tiag yuav yog nyob rau hauv CPVC (qhov tseem ceeb xim ntim ntim) txog. Rau cov thickener, yog xaiv kom zoo viscosity ntawm cellulose, ib tug kuj ua tiav thiab ntom zaj duab xis yuav tsum tau ua kom tau raws li peb qhov kev ua tau zoo ntawm cov xim pob zeb tiag tiag. Yog tias cov ntsiab lus ntawm emulsion tsawg, nws raug nquahu kom siv cov viscosity ntau dua ntawm cellulose ua cov thickener (piv txwv li 100,000 viscosity), tshwj xeeb tshaj yog tom qab tus nqi ntawm cellulose nce, uas tuaj yeem txo cov cellulose siv, kuj tuaj yeem cia qhov kev ua tau zoo. ntawm tiag pob zeb xim ntau superior. Qee cov tuam ntxhab ntawm cov xim pob zeb uas tsis tshua muaj nqi tau hloov hydroxyethyl cellulose nrog hypromellose vim yog tus nqi thiab lwm yam kev xav. Piv nrog rau ob hom cellulose, hydroxyethyl cellulose muaj peev xwm tuav tau dej zoo dua, tsis poob dej tuav lub peev xwm vim gel ntawm qhov kub thiab txias, thiab muaj qee yam mildew kuj. Rau kev ua tau zoo, nws raug nquahu kom siv 100,000 viscosity hydroxyethyl cellulose ua thickener ntawm cov xim pob zeb tiag.
Post lub sij hawm: Lub Xya hli ntuj-24-2023