Vim tias cov khoom ntawm hydroxypropyl methylcellulose zoo ib yam li lwm cov ethers uas yaj tau hauv dej, nws tuaj yeem siv rau hauv cov txheej emulsion thiab cov khoom siv txheej txheej uas yaj tau hauv dej ua tus neeg sawv cev ua zaj duab xis, thickener, emulsifier thiab stabilizer, thiab lwm yam, uas ua rau cov zaj duab xis txheej tsis kam zoo. Homogeneous txheej thiab lo rau, thiab txhim kho qhov nro ntawm qhov chaw, kev ruaj khov rau cov kua qaub thiab cov hauv paus, thiab kev sib raug zoo nrog cov xim hlau.
Vim tias HPMC muaj qhov taw tes gel siab dua li MC, nws kuj tiv taus kev tawm tsam ntawm cov kab mob ntau dua li lwm cov cellulose ethers, thiab yog li ntawd tuaj yeem siv ua tus neeg sawv cev rau cov txheej txheem emulsion aqueous. HPMC muaj kev ruaj khov zoo ntawm kev khaws cia thiab nws cov dispersibility zoo heev, yog li HPMC tshwj xeeb tshaj yog tsim los ua tus neeg faib tawm hauv cov txheej txheem emulsion.
Daim ntawv thov ntawm hydroxypropyl methyl cellulose hauv kev lag luam txheej yog raws li nram no.
1. ntau yam viscosity HPMC configuration xim hnav tsis kam, kub tsis kam, tiv thaiv kab mob piav qhia, ntxuav tsis kam thiab ruaj khov rau cov kua qaub thiab cov hauv paus zoo dua; nws kuj tseem siv tau ua cov xim stripper uas muaj methanol, ethanol, propanol, isopropyl cawv, ethylene glycol, acetone, methyl ethyl ketone lossis diketone cawv thickener; HPMC formulated emulsified coatings muaj kev sib txhuam ntub zoo heev; HPMC dua li HEC thiab EHEC thiab CMC li HPMC muaj cov nyhuv zoo dua li HEC thiab EHEC thiab CMC ua xim thickener.
2. Hydroxypropyl methyl cellulose uas muaj ntau yam hloov pauv zoo muaj kev tiv thaiv kab mob zoo dua li kev hloov pauv qis, thiab muaj kev ruaj khov viscosity zoo dua hauv polyvinyl acetate thickeners. Lwm cov cellulose ethers nyob hauv kev khaws cia vim yog qhov kev puas tsuaj ntawm cov saw hlau ntawm cellulose ether thiab ua rau cov txheej viscosity txo qis.
3. Cov tshuaj pleev xim tuaj yeem yaj tau hauv dej HPMC (qhov twg methoxy yog 28% txog 32%, hydroxypropoxy yog 7% txog 12%), dioxymethane, toluene, paraffin, ethanol, methanol configuration, nws yuav raug siv rau ntawm qhov chaw ncaj, nrog rau qhov xav tau viscosity thiab volatility. Cov tshuaj pleev xim no tshem tawm feem ntau cov xim tsuag, varnishes, enamels, thiab qee cov epoxy esters, epoxy amides, catalyzed epoxy amides, acrylates, thiab lwm yam. Ntau cov xim tuaj yeem tev tawm hauv ob peb feeb, qee cov xim xav tau 10 ~ 15 feeb lossis ntau dua, cov tshuaj pleev xim no tshwj xeeb tshaj yog rau cov ntoo.
4. Cov xim pleev xim dej muaj peev xwm ua los ntawm 100 feem ntawm cov xim tsis muaj zog lossis cov xim organic, 0.5 ~ 20 feem ntawm cov alkyl cellulose lossis hydroxyalkyl cellulose uas yaj tau hauv dej thiab 0.01 ~ 5 feem ntawm polyoxyethylene ether lossis ether ester. Piv txwv li, cov xim tau los ntawm kev sib tov 1.5 feem ntawm HPMC, 0.05 feem ntawm polyethylene glycol alkyl phenyl ether, 99.7 feem ntawm titanium dioxide thiab 0.3 feem ntawm carbon dub. Tom qab ntawd sib tov cov khoom sib tov nrog 100 feem ntawm 50% polyvinyl acetate kom tau txais cov xim pleev xim, thiab tsis muaj qhov sib txawv ntawm cov zaj duab xis qhuav uas tsim los ntawm kev siv nws rau ntawm daim ntawv tuab thiab txhuam nws maj mam nrog txhuam.
Lub sijhawm tshaj tawm: Tsib Hlis-20-2022