I-Hydroxypropyl methylcellulose (HPMC) yikhompawundi esebenza ngeendlela ezininzi esetyenziswa kakhulu kumashishini ahlukeneyo ngenxa yokwakheka kwayo okwahlukileyo kweekhemikhali kunye neempawu zayo.
1. Ukwakhiwa kweekhemikhali:
a. Umqolo weseli:
I-HPMC yi-cellulose derivative, oko kuthetha ukuba ivela kwi-cellulose, i-polysaccharide yendalo efumaneka kwiindonga zeeseli zezityalo. I-Cellulose ineeyunithi eziphindaphindayo ze-β-D-glucose edityaniswe ziibhondi ze-glycosidic ze-β(1→4).
b. Ukutshintshwa:
Kwi-HPMC, i-hydroxyl (-OH) ye-cellulose backbone ithathelwa indawo ngamaqela e-methyl kunye ne-hydroxypropyl. Olu tshintsho lwenzeka nge-etherification reaction. I-Degree of substitution (DS) ibhekisa kwinani eliqhelekileyo lamaqela e-hydroxyl athathelwa indawo ngeyunithi yeglucose kwi-cellulose chain. I-DS yamaqela e-methyl kunye ne-hydroxypropyl yahlukile, nto leyo echaphazela ukusebenza kwe-HPMC.
2. Ukwenziwa kwezinto:
a. Ukufakelwa kwe-ether:
I-HPMC yenziwa nge-etherification reaction ye-cellulose ene-propylene oxide kunye ne-methyl chloride. Le nkqubo ibandakanya ukusabela kwe-cellulose ene-propylene oxide ukwazisa amaqela e-hydroxypropyl, uze emva koko usebenzise i-methyl chloride ukwazisa amaqela e-methyl.
b. Umgangatho wolawulo olulolunye:
I-DS ye-HPMC inokulawulwa ngokulungelelanisa iimeko zokusabela ezifana nobushushu, ixesha lokusabela, kunye noxinzelelo lwe-reactant.
3. Ukusebenza:
a. Ukunyibilika:
I-HPMC iyanyibilika emanzini nakwezinye izinyibilikisi zendalo, ezifana ne-methanol kunye ne-ethanol. Nangona kunjalo, ukunyibilika kwayo kuncipha xa ubunzima be-molecular busanda kunye nenqanaba lokutshintshwa.
b. Ukwenziwa kwefilimu:
I-HPMC yenza ifilimu ecacileyo neguquguqukayo xa inyibilikiswa emanzini. Ezi filimu zinamandla oomatshini kunye neempawu zokuthintela.
C. Ukuxinana:
Izisombululo ze-HPMC zibonisa ukuziphatha okungama-pseudoplastic, nto leyo ethetha ukuba i-viscosity yazo iyancipha xa isantya sokucheba sisanda. I-viscosity yezisombululo ze-HPMC ixhomekeke kwizinto ezifana noxinzelelo, ubunzima beemolekyuli, kunye nobungakanani bokutshintshwa kwazo.
d. Ukugcinwa kwamanzi:
Enye yeempawu eziphambili ze-HPMC kukukwazi kwayo ukugcina amanzi. Le mpawu ibaluleke kakhulu kwiindlela ezahlukeneyo zokusebenza ezifana nezixhobo zokwakha, apho i-HPMC isetyenziswa njengesithambisi kunye nearhente yokugcina amanzi.
e. Ukunamathela:
I-HPMC idla ngokusetyenziswa njengesincamathelisi kwimizi-mveliso eyahlukeneyo ngenxa yokukwazi kwayo ukwenza iibhondi eziqinileyo kwiziseko ezahlukeneyo.
4. Isicelo:
a. Ishishini leMithi:
Kwimithi, i-HPMC isetyenziswa njenge-binder, i-arhente yokugquma ifilimu, i-arhente yokukhulula elawulwayo, kunye ne-viscosity modifier kwi-tablet formulations.
b. Ishishini lokwakha:
I-HPMC yongezwa kwiimortars ezisekwe kwisamente, iiplaster ezisekwe kwi-gypsum kunye nee-adhesive zethayile ukuphucula ukusebenza kakuhle, ukugcinwa kwamanzi kunye nokunamathela.
C. ishishini lokutya:
Kwishishini lokutya, i-HPMC isetyenziswa njengesithambisi, isiqinisi kunye nesixubisisi kwiimveliso ezifana neesosi, iidiresi kunye ne-ayisikhrim.
d. Iimveliso zokhathalelo lomntu:
I-HPMC isetyenziswa njengesithambisi-mafutha, i-emulsifier kunye ne-arhente yokwenza ifilimu kwiimveliso zokhathalelo lomntu ezifana neeshampu, iiloshini kunye neekhrimu.
e. Iipeyinti kunye neengubo:
Kwiipeyinti nakwiingubo, i-HPMC isetyenziselwa ukuphucula ukusasazwa kwemibala, ulawulo lwe-viscosity kunye nokugcinwa kwamanzi.
IHydroxypropylmethylcellulose (HPMC) yikhompawundi eguquguqukayo eneentlobo ngeentlobo zezicelo kumashishini ahlukeneyo. Ukwakheka kwayo okwahlukileyo kweekhemikhali, ukwenziwa kwayo kunye neempawu zayo kuyenza ibe sisithako esibalulekileyo kumayeza, izixhobo zokwakha, ukutya, iimveliso zokhathalelo lomntu kunye neepeyinti/iingubo. Ukuqonda iipropati zeHPMC kuvumela ukusetyenziswa okwenziwe ngokwezifiso kumacandelo ahlukeneyo, okufaka isandla ekusetyenzisweni kwayo ngokubanzi kunye nokubaluleka kwayo kwiinkqubo zokuvelisa zanamhlanje.
Ixesha lokuthumela: Februwari-22-2024