Hydroxypropyl methylcellulose (HPMC) waa xarun isku dhafan oo si ballaaran loogu isticmaalo warshado kala duwan sababtoo ah isku dhafka kiimikada iyo sifooyinka gaarka ah.
1. Halabuurka kiimikada:
a.Laf-dhabarka Cellulose:
HPMC waa derivative cellulose, taas oo macnaheedu yahay in laga soo qaatay cellulose, polysaccharide dabiiciga ah ee laga helo gidaarada unugyada dhirta.Cellulose waxay ka kooban tahay unugyo soo noqnoqda oo ah β-D-glucose oo ku xidhan β(1→4) glycosidic bonds.
b.Beddel:
Gudaha HPMC, unugyada hydroxyl (-OH) ee laf dhabarta cellulose waxaa lagu bedelay methyl iyo kooxaha hydroxypropyl.Beddelkaani wuxuu ku yimaadaa falcelinta etherification.Darajada beddelka (DS) waxaa loola jeedaa celceliska tirada kooxaha hydroxyl ee lagu beddelay unugga gulukooska ee silsiladda cellulose.DS ee kooxaha methyl iyo hydroxypropyl way kala duwan yihiin, taas oo saamaysa waxqabadka HPMC.
2. Synthesis:
a.Etherification:
HPMC waxa lagu farsameeyay falcelinta etherification ee cellulose leh propylene oxide iyo methyl chloride.Nidaamku wuxuu ku lug leeyahay falcelinta cellulose leh propylene oxide si loo soo bandhigo kooxaha hydroxypropyl ka dibna methyl chloride si loo soo bandhigo kooxaha methyl.
b.Heerka xakamaynta beddelka ah:
DS ee HPMC waxaa lagu xakameyn karaa iyadoo la hagaajinayo xaaladaha falcelinta sida heerkulka, waqtiga falcelinta, iyo feejignaanta falcelinta.
3. Waxqabadka:
a.Xalka:
HPMC waxay ku milmi kartaa biyaha iyo qaar ka mid ah dareerayaasha organic, sida methanol iyo ethanol.Si kastaba ha ahaatee, milmayntiisa ayaa hoos u dhacda iyada oo korodhka miisaanka molecular iyo heerka beddelka.
b.Sameynta filimka:
HPMC waxay samaysaa filim hufan, dabacsan marka lagu milmo biyaha.Filimadani waxay leeyihiin awood farsamo oo wanaagsan iyo sifooyin caqabad ah.
C. Viscosity:
Xalalka HPMC waxay muujinayaan dabeecada pseudoplastic, taasoo la micno ah in maw-jiidkoodu hoos u dhaco iyadoo la kordhinayo heerka dhogorta.Viscosity ee xalalka HPMC waxay ku xiran tahay arrimo ay ka mid yihiin fiirsashada, miisaanka kelli, iyo heerka beddelka.
d.Haysashada biyaha:
Mid ka mid ah sifooyinka muhiimka ah ee HPMC waa awoodda ay u leedahay in ay biyaha ceshato.Hantidani waxay muhiim u tahay codsiyada kala duwan sida qalabka dhismaha, halkaasoo HPMC loo isticmaalo dhumuc iyo biyo haynta.
e.Adhesion:
HPMC waxaa inta badan loo isticmaalaa sidii xabag ahaan warshadaha kala duwan sababtoo ah awooda ay u leedahay in ay sameeyaan bonds adag substrates kala duwan.
4. Codsiga:
a.Warshadaha dawooyinka:
Daawooyinka, HPMC waxa loo istcimaalayaa xidhe ahaan, wakiilka daahan filimada, wakiilka sii daynta la kantaroolo, iyo wax ka beddelka viscosity ee qaabaynta kiniinka.
b.Warshadaha dhismaha:
HPMC waxaa lagu daraa hoobiyeyaal sibidh-ku-saleysan, malaastaan-gypsum-ku-saleysan iyo xabag-tileed si loo hagaajiyo karti-shaqsiyeedka, haysashada biyaha iyo ku-dhejinta.
C. warshadaha cuntada:
Warshadaha cuntada, HPMC waxa loo isticmaalaa dhumucdiye, xasiliye iyo emulsifier alaabta sida suugada, labiska iyo jalaatada.
d.Alaabooyinka daryeelka shakhsi ahaaneed:
HPMC waxa loo isticmaalaa sidii dhumuc weyn, emulsifier iyo wakiilka filim samaynta ee alaabta daryeelka shakhsi ahaaneed sida shaambada, looshannada iyo kiriimyada.
e.Rinjiyeynta iyo Dahaarka:
Rinjiga iyo dahaarka, HPMC waxaa loo isticmaalaa si loo hagaajiyo kala firdhisanaanta midabka, xakamaynta viscosity iyo haysashada biyaha.
Hydroxypropylmethylcellulose (HPMC) waa xarun isku dhafan oo leh codsiyo kala duwan oo warshado kala duwan ah.Isku dhafka kiimikaad ee gaarka ah, isku-dhafka iyo sifooyinka ayaa ka dhigaya shay muhiim u ah daawooyinka, qalabka dhismaha, cuntada, alaabta daryeelka shakhsi ahaaneed iyo rinji / dahaarka.Fahamka sifooyinka HPMC waxay u oggolaanaysaa codsiyada la habeeyey ee meelo kala duwan, iyada oo gacan ka geysanaysa isticmaalkeeda baahsan iyo muhiimada hababka wax soo saarka casriga ah.
Waqtiga boostada: Febraayo-22-2024