Hydroxypropyl methylcellulose (HPMC), cellulose ceeriin, waxaa lagu sifeyn karaa suuf ama saxarka alwaax, waxaa aad loogu baahan yahay in la burburiyo ka hor alkalization ama inta lagu guda jiro alkalization, iyo burburinta waa iyada oo loo marayo tamar farsamo Burbur qaab dhismeedka guud ee alaabta ceeriin cellulose si loo yareeyo heerka crystallinity iyo polymerization, waxay kordhisaa aagga dusha sare, taas oo hagaajinaysa helitaanka iyo awoodda falcelinta kiimikada ee falcelinta falcelinta ee saddexda kooxood ee hydroxyl ee kooxda giraanta gulukooska ee macromolecule cellulose.
Hydroxypropyl methylcellulose (HPMC) waxaa loo isticmaalaa sida substrate alaabta ceeriin si loo soo saaro saliid, taas oo xaqiijin karta isticmaalka wadarta sonkorta, hagaajinta heerka isticmaalka ee alaabta ceeriin, la yareeyo qadarka haraaga substrate ee maraq halsano, iyo in la yareeyo qiimaha biyaha wasakhda ah. daaweynta. Tani hydroxypropyl methylcellulose Tilmaamaha methylcellulose waxay ku habboon yihiin hagaajinta dufcaddii, dufcaddii quudinta iyo hababka halsano ee joogtada ah, ka fogaanshaha dhibaatooyinka isdaba-joogga ah sida xakamaynta isku-dhafka dhexdhexaadinta iyo heerka dhexdhexaadinta; waxa kale oo ay ku haboon tahay nidaaminta habka halsano. Maaddaama waxqabadka hydroxypropyl methylcellulose (HPMC) uu la mid yahay ether-yada kale ee biyaha ku milma, waxaa loo isticmaali karaa rinjiga cinjirka ah iyo qaybaha rinjiga biyaha ku milmi kara sida wakiilka filim-samaynta, dhumuc weyn, emulsifier iyo stabilizer, iwm. Filimku wuxuu leeyahay. iska caabin wanaagsan oo xidhidh, simaynta iyo adhesion, oo waxa uu hagaajiyay kacsanaanta dusha, xasilloonida si aysiidh iyo alkali, iyo waafaqsan yahay midabada macdan.
Hydroxypropyl methylcellulose (HPMC) waxay leedahay saameyn wanaagsan sida dhumuc weyn oo loogu talagalay rinjiga polyvinyl acetate ee biyaha ku salaysan. Heerka beddelka etherka cellulose waa la kordhiyaa, iyo iska caabinta nabaad-guurka bakteeriyada ayaa sidoo kale la xoojiyaa.
In kasta oo mabda'a isku-dhafka etherification ee hydroxypropyl methyl cellulose (HPMC) aanu ahayn mid adag, waxay u baahan tahay in alkalized, alaabta ceeriin la miiro, iyo alkalized. Deegaan kasta oo etherification ah, soo kabashada dareeraha, centrifugation, dhaqida iyo qalajinta waxay ku lug leedahay tiro badan oo tignoolajiyada muhiimka ah iyo aqoon qani ah.
Noocyada kala duwan ee alaabooyinka, deegaan kastaa wuxuu leeyahay xaaladihii ugu dambeeyay ee xakamaynta, sida heerkulka, wakhtiga, cadaadiska iyo xakamaynta socodka alaabta. Qalabka caawinta iyo qalabka xakamaynta ayaa ah dammaanad wanaagsan oo loogu talagalay tayada badeecada deggan iyo nidaamyada wax soo saarka ee la isku halayn karo.
Waqtiga boostada: Dec-15-2022