Hydroxypropyl methylcellulose (HPMC) waa isku-dhis badan oo si weyn loogu isticmaalo warshado kala duwan sababtoo ah halabuurka kiimikada iyo sifooyinka gaarka ah.
1. Halabuurka kiimikada:
a. Laf-dhabarta Cellulose:
HPMC waa nooc ka mid ah unugyada cellulose, taasoo la macno ah inay ka soo jeedo cellulose, polysaccharide dabiici ah oo laga helo derbiyada unugyada dhirta. Cellulose wuxuu ka kooban yahay cutubyo soo noqnoqda oo ah β-D-glucose oo ku xiran β(1→4) glycosidic bonds.
b. Beddelka:
HPMC, qaybta hydroxyl (-OH) ee laf-dhabarta cellulose waxaa lagu beddelaa kooxaha methyl iyo hydroxypropyl. Beddelkan wuxuu dhacaa iyada oo loo marayo fal-celinta etherification. Heerka beddelka (DS) wuxuu tilmaamayaa tirada celceliska kooxaha hydroxyl ee lagu beddelay cutub kasta oo gulukoos ah oo ku jira silsiladda cellulose. DS-ka kooxaha methyl iyo hydroxypropyl way kala duwan yihiin, taas oo saameysa waxqabadka HPMC.
2. Isku-darka:
a. Kala-soocidda:
HPMC waxaa lagu sameeyaa falgalka etherification ee cellulose oo leh propylene oxide iyo methyl chloride. Hawshu waxay ku lug leedahay in cellulose la falgalo propylene oxide si loo soo bandhigo kooxaha hydroxypropyl ka dibna methyl chloride si loo soo bandhigo kooxaha methyl.
b. Heerka xakamaynta beddelka ah:
DS-ka HPMC waxaa lagu xakamayn karaa iyadoo la hagaajinayo xaaladaha falcelinta sida heerkulka, waqtiga falcelinta, iyo fiirsashada fal-celinta.
3. Waxqabadka:
a. Milmi kara:
HPMC wuxuu ku milmaa biyaha iyo qaar ka mid ah dareerayaasha dabiiciga ah, sida methanol iyo ethanol. Si kastaba ha ahaatee, milmideedu way yaraataa marka ay korodho miisaanka molecular-ka iyo heerka beddelka.
b. Samaynta Filimada:
HPMC waxay samaysaa filim hufan oo dabacsan marka lagu milmo biyaha. Filimadani waxay leeyihiin awood farsamo oo wanaagsan iyo sifooyin caqabad.
C. Viscosity:
Xalalka HPMC waxay muujiyaan dabeecad been abuur ah, taasoo la micno ah in dheddiggoodu uu hoos u dhaco marka heerka xiirashada uu sii kordho. Dheefshiidka xalalka HPMC wuxuu ku xiran yahay arrimo ay ka mid yihiin xoogga saarista, miisaanka molecular-ka, iyo heerka beddelka.
d. Haynta biyaha:
Mid ka mid ah sifooyinka muhiimka ah ee HPMC waa awooddeeda ay ku hayn karto biyaha. Hantidani waa mid muhiim u ah codsiyada kala duwan sida qalabka dhismaha, halkaas oo HPMC loo isticmaalo sidii wax lagu dhejiyo oo lagu hayo biyaha.
e. Ku dhegganaansho:
HPMC waxaa badanaa loo isticmaalaa sidii dhejis warshado kala duwan sababtoo ah awooddeeda ay ku sameysan karto xiriiro xooggan oo ku saabsan substrate-yada kala duwan.
4. Codsiga:
a. Warshadaha dawooyinka:
Daawooyinka, HPMC waxaa loo isticmaalaa sidii xidhmo, wakiil dahaarka filimka, wakiil sii dayn la xakameeyey, iyo wax ka beddele viscosity-ga ee qaacidooyinka kiniinka.
b. Warshadaha dhismaha:
HPMC waxaa lagu daraa hoobiyeyaal ku salaysan sibidhka, balaastikada ku salaysan gypsum iyo dhejisyada taayilada si loo hagaajiyo shaqada, haynta biyaha iyo dhegdheg.
C. warshadaha cuntada:
Warshadaha cuntada, HPMC waxaa loo isticmaalaa sidii dhumuc-dheg, xasiliye iyo emulsifier alaabada sida maraqa, maraqa iyo jalaatada.
d. Badeecadaha daryeelka shaqsiga:
HPMC waxaa loo isticmaalaa sidii qaro-qafiye, emulsifier iyo wakiil sameeya filimada alaabada daryeelka shakhsi ahaaneed sida shaambooyada, looshinnada iyo kareemada.
e. Rinjiyeynta iyo Dahaarka:
Rinjiyada iyo dahaarka, HPMC waxaa loo isticmaalaa in lagu hagaajiyo kala firdhinta midabka, xakamaynta naqaska iyo haynta biyaha.
Hydroxypropylmethylcellulose (HPMC) waa isku-dhafan kala duwan oo leh codsiyo kala duwan oo warshado kala duwan ah. Halabuurka kiimikada ee gaarka ah, isku-darka iyo sifooyinka ayaa ka dhigaya qayb muhiim ah daawooyinka, agabka dhismaha, cuntada, alaabada daryeelka shakhsi ahaaneed iyo rinjiyeynta/dahaarka. Fahmidda sifooyinka HPMC waxay u oggolaanaysaa codsiyada loo habeeyey ee dhinacyo kala duwan, taasoo gacan ka geysanaysa isticmaalkeeda baahsan iyo muhiimadda ay u leedahay hababka wax-soo-saarka casriga ah.
Waqtiga boostada: Febraayo-22-2024