Hydroxypropyl methyl cellulose (HPMC), alaabta ceeriincellulose, waxa la safayn karaa cudbi ama saxarka alwaax. Waa lagama maarmaan in la jeexjeexo ka hor ama inta lagu jiro habka alkalization. Burburinta waxaa lagu sameeyaa tamarta farsamada. Burburinta qaab-dhismeedka isku-darka ah ee alaabta ceeriin ee cellulose si loo yareeyo crystallinity iyo polymerization degree iyo kordhiyo aagga ay dusha, markaas hagaajinta helitaanka iyo awoodda falcelinta kiimikada ee reagents saddex kooxood hydroxyl on saldhigga giraanta gulukooska macromolecular cellulose.
Hydroxypropyl methyl cellulose (HPMC)waxaa loo isticmaalaa sida substrate-ka alaabta ceeriin si loo soo saaro saliid, taas oo xaqiijin karta isticmaalka sonkorta oo dhan, hagaajinta heerka isticmaalka alaabta ceeriin, la yareeyo tirada haraaga substrate ee maraq halsano, iyo in la yareeyo kharashka daaweynta biyaha wasakhda ah. Astaamahamethyl cellulosewaxay ku habboon yihiin hagaajinta dufcaddii, dufcaddii quudinta iyo hababka halsano ee joogtada ah, ka fogaanshaha dhibaatooyinka isdaba-joogga ah sida xakamaynta halabuurka dhexdhexaadka ah iyo heerka milanka; Isla mar ahaantaana, waxay sidoo kale ku habboon tahay nidaaminta habka halsano. Sababtoo ah sifooyinkahydroxypropyl methyl cellulose (HPMC)waxay la mid yihiin ether-yada kale ee biyaha ku milma, waxaa loo isticmaali karaa sida wakiilka filim-samaynta, dhumucdiisuna, emulsifier iyo stabilizer ee dahaarka cinjirka ah iyo qaybaha dahaarka biyaha-milmi kara, taasoo suurtogal ka dhigaysa in la sameeyo daahan Filimku wuxuu leeyahay caabbinta abrasion wanaagsan, siman guryaha iyo adhesion, oo waxay hagaajisay xiisadda dusha sare, xasiloonida aashitada iyo alkali, iyo waafaqsanaanta midabada macdan.
Hydroxypropyl methyl cellulose (HPMC)waxay leedahay saameyn wanaagsan sida dhumuc weyn oo loogu talagalay daahannada polyvinyl acetate ee ku salaysan biyaha cad. Heerka beddelka eeether cellulosewaa la kordhiyaa, caabbinta bakteeriyada iyo nabaad guurka ayaa sidoo kale la kordhiyaa.
In kasta oo mabda'a isku-darka etherification ee hydroxypropyl methylcellulose (HPMC) aanu ahayn mid adag, waa alkalization, jajabinta alaabta ceeriin, iyo alkalization. Deegaannada kala duwan ee etherification, soo kabashada dareeraha, kala-soocidda centrifugal, dhaqidda iyo qalajinta waxay ku lug leeyihiin 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 la isku halayn karo oo faa'iido leh oo loogu talagalay tayada alaabta xasilloon iyo nidaamka wax soo saarka ee la isku halayn karo.
Tilmaamaha alaabta eehydroxypropyl methyl cellulose:
1. Properties: Alaabtani waa budo cad, oo aan ur lahayn, dhadhamin iyo ma sun ah.
2. Saamaynta xajinta biyaha: Sababtoo ah alaabtani waxay nuugi kartaa biyaha dhowr jeer ka culus lafteeda. Ku ilaali haynta biyaha sare ee hoobiye, gypsum, rinjiga iyo alaabta kale.
3. Alaabtan waxaa lagu milmi karaa biyo qabow si loo sameeyo dareere muuqda oo muuqda.
4. Kala dirida walxaha dabiiciga ah: Sababtoo ah waxa ku jira xaddi gaar ah oo hidde-sidayaasha hydrophobic, alaabtan waxaa lagu milmi karaa qaar ka mid ah dareerayaasha organic, sidoo kale waxay ku milmi kartaa dareeraha isku dhafan ee biyaha iyo walxaha organic.
5. Iska caabinta milixda: Maadaama badeecadani ay tahay mid aan-ionic iyo non-polyelectrolyte ahayn, waxay ku xasilloon tahay xalalka aqueous ee cusbada birta ah ama electrolytes organic. Haddii ay dhacdo koronto badan, waxaa laga yaabaa inay keento da' ama biyo.
6. Dhaqdhaqaaqa dusha sare: Xalka aqueous ee alaabtani waxay leedahay hawlo dusha sare ah.
Waqtiga boostada: Nov-29-2021
