1.Hydroxypropyl methyl cellulose
Hydroxypropyl methylcellulosewaa nooc ka mid ah cellulose ka oo wax soo saarkiisa iyo isticmaalkiisu aad u kordhayaan. Waa ether-ka isku qasan ee aan-ionic-ka ahayn oo laga sameeyay suuf la safeeyey ka dib alkalization, iyadoo la isticmaalayo propylene oxide iyo methyl chloride sida wakiilka etherification, iyada oo loo marayo falcelin taxane ah. Darajada beddelka guud ahaan waa 1.2 ~ 2.0. Sifooyinkeedu way kala duwan yihiin iyadoo ku xidhan saamiga maadada methoxyl iyo ka kooban hydroxypropyl.
(1) Hydroxypropyl methylcellulose waxay si fudud ugu milmi kartaa biyo qabow, waxayna la kulmi doontaa dhibaatooyin xagga ku milanka biyaha kulul. Laakiin heerkulkeeda gelation ee biyaha kulul aad ayuu uga sarreeyaa kan methyl cellulose. Ku milanka biyaha qabow sidoo kale si weyn ayaa loo hagaajiyay marka la barbar dhigo methyl cellulose.
(2) (2) Viscosity of hydroxypropyl methylcellulose waxay la xiriirtaa culeyskeeda kelli, iyo marka uu weynaado culeyska kelliga ah, waa uu sarreeyaa viscosity. Heerkulka ayaa sidoo kale saameeya viscosity-kiisa, marka heerkulku kordho, viscosity ayaa hoos u dhacaya. Si kastaba ha ahaatee, saamaynta viscosity sare iyo heerkulku wuu ka hooseeyaa kan methyl cellulose. Xalkeedu waa mid deggan marka lagu kaydiyo heerkulka qolka.
(3) Haysashada biyaha ee hydroxypropyl methylcellulose waxay kuxirantahay qadarka dheeriga ah, viscosity, iwm.
(4). Caustic soodhaha iyo biyaha lime waxay saameyn yar ku leeyihiin waxqabadkooda, laakiin alkali waxay dedejin kartaa heerka kala diristeeda oo wax yar kordhin kartaa viscosity-keeda. Hydroxypropyl methylcellulose waxay ku xasilloon tahay cusbada caadiga ah, laakiin marka fiirsashada xalka milixdu uu sarreeyo, viscosity of hydroxypropyl methylcellulose xalka wuxuu u muuqdaa inuu kordho.
(5) Hydroxypropyl methylcellulose waxaa lagu qasi karaa polymers-ka biyaha-milmi kara si loo sameeyo xal isku mid ah, oo viscosity sare leh. Sida khamriga polyvinyl, ether istaarijka, xanjada khudradda, iwm.
(6) Hydroxypropyl methylcellulose waxay leedahay iska caabin enzyme ka wanaagsan methylcellulose, xalkeeduna aad bay u yar tahay in ay hoos u dhigto enzymes marka loo eego methylcellulose.
(7) Ku-dhejinta hydroxypropyl methylcellulose ee dhismaha hoobiye ayaa ka sarreeya kan methylcellulose.
2. Hydroxyethyl cellulose
Waxaa laga sameeyay suuf la safeeyey oo lagu daaweeyay alkali, waxaana lagu falceliyay ethylene oxide sida wakiilka etherification iyadoo ay jirto isopropanol. Heerkeeda beddelka guud ahaan waa 1.5 ~ 2.0. Waxay leedahay hydrophilicity xoog leh oo ay fududahay in la nuugo qoyaanka.
(1) Hydroxyethyl cellulose waxay ku milmaysaa biyo qabow, laakiin way adagtahay in lagu milmo biyo kulul. Xalkeedu wuxuu ku xasilloon yahay heerkul sare oo aan lahayn gelling. Waxaa loo isticmaali karaa waqti dheer heerkulka sare ee hoobiye, laakiin haynta biyaha ayaa ka hooseeya kan methyl cellulose.
(2)Hydroxyethyl cellulosewaxay ku xasiloon tahay aashitada iyo alkali-ga guud, alkali-kuna wuxuu dedejin karaa kala diristiisa oo wax yar kordhin karaa mad-madowga. Kala firdhisanaanteeda biyaha ayaa xoogaa ka sii daran tan methyl cellulose iyo hydroxypropyl methyl cellulose.
(3) Hydroxyethyl cellulose waxay leedahay wax qabad wanaagsan oo ka hortag ah oo hoobiye ah, laakiin waxay leedahay waqti dheer oo dib u dhac ah sibidhka.
(4) Waxqabadka cellulose-ka hydroxyethyl cellulose ee ay soo saaraan qaar ka mid ah shirkadaha gudaha ayaa iska cad in uu ka hooseeyo kan methyl cellulose sababtoo ah waxa ku jira biyaha oo sarreeya iyo waxa ku jira dambaska oo sarreeya.
(5) Caariyaynta dareeraha biyaha ee hydroxyethyl cellulose waa mid halis ah. Heerkul ku saabsan 40 ° C, caariyaysigu waxay ku dhici kartaa 3 ilaa 5 maalmood gudahood, taas oo saameyn doonta waxqabadkeeda.
Waqtiga boostada: Abriil-28-2024