ALAAB HPMC

Hydroxypropyl Methylcellulose (HPMC) waa eter cellulose ah oo ka soo jeeda cellulose dabiiciga ah, ugu horrayn alwaax ama suuf, iyada oo loo marayo taxane kiimiko ah. Halkan waxaa ah dulmar guud oo ku saabsan maaddooyinka iyo sifooyinka HPMC:

1. Cellulose: Cellulose waa sheyga ugu muhiimsan ee HPMC. Waa polysaccharide si dabiici ah u dhacda oo ka kooban unugyo gulukoos oo soo noqnoqda oo ku xidhan silsilado dhaadheer. Cellulose waxay u adeegtaa sidii laf dhabarta HPMC waxayna bixisaa daacadnimada qaabdhismeedka.
2. Methylation: Laf-dhabarka cellulose ayaa kiimiko ahaan wax looga beddelay habka loo yaqaan methylation, halkaas oo methyl chloride lagu falceliyo cellulose iyadoo ay jirto alkali si loogu soo bandhigo kooxaha methyl (-CH3) ee silsiladda cellulose. Nidaamkan methylation wuxuu lagama maarmaan u yahay kor u qaadista milanka biyaha iyo sifooyinka kale ee cellulose.
3. Hydroxypropylation: Marka lagu daro methylation, kooxaha hydroxypropyl (-CH2CHOHCH3) ayaa sidoo kale laga yaabaa in lagu soo bandhigo silsiladda cellulose iyada oo loo marayo hydroxypropylation. Tani waxay sii kordhinaysaa sifooyinka cellulose, hagaajinta xajinta biyaha, kartida filim samaynta, iyo sifooyinka kale.
4. Etherification: Soo bandhigida kooxaha methyl iyo hydroxypropyl ee silsiladda cellulose waxaa loo yaqaan etherification. Etherification waxay bedeshaa qaabdhismeedka kiimikada ee cellulose, taasoo keentay samaynta HPMC oo leh sifooyin gaar ah oo ku habboon codsiyada kala duwan.
5. Guryaha Jirka: HPMC caadi ahaan waa caddaan ilaa cad-cad, aan ur lahayn, iyo budo aan dhadhamin. Waxay ku milmi kartaa biyo qabow waxayna samaysaa xalal cad ama wax yar oo turbid ah iyadoo ku xiran hadba inta ay le'eg tahay iyo darajada. HPMC waxa ay muujisaa haynta biyaha, dhumucyada, samaynta filimada, iyo sifooyinka dhaqdhaqaaqa dusha sare, taas oo ka dhigaysa mid qiimo leh warshado kala duwan, oo ay ku jiraan dhismaha, dawooyinka, cuntada, iyo waxyaalaha la isku qurxiyo.

Guud ahaan, maaddooyinka ugu muhiimsan ee HPMC waa cellulose, chloride methyl (loogu talagalay methylation), iyo propylene oxide (loogu talagalay hydroxypropylation), oo ay la socdaan kicinta alkali iyo waxyaabo kale oo lagu daro habka wax soo saarka. Maaddooyinkani waxay marayaan falcelin kiimikaad si ay u soo saaraan HPMC oo leh sifooyin gaar ah oo loogu talagalay inay buuxiyaan shuruudaha codsiyada kala duwan.