IHydroxypropyl Methyl Cellulose (HPMC), eyaziwa ngegama lorhwebo ihypromellose, yipolymer eyenziweyo ephuma kwi-cellulose yendalo. Umthombo oyintloko we-cellulose wokuvelisa i-HPMC ngokuqhelekileyo yi-pulp yomthi okanye ikotoni. Inkqubo yokuvelisa ibandakanya ukuguqula i-cellulose ngokweekhemikhali ngokusebenzisa i-etherification, ukungenisa amaqela e-hydroxypropyl kunye ne-methyl kwi-backbone ye-cellulose.

Ukuveliswa kwe-HPMC kubandakanya amanyathelo aliqela:

1. Ukukhupha iCellulose:
   • I-cellulose ifunyanwa kwizityalo, ikakhulu i-pulp yomthi okanye i-cotton. I-cellulose iyakhutshwa kwaye icocwe ukuze kwenziwe i-cellulose pulp.
2. Ukwenziwa kwe-alkalization:
   • I-cellulose pulp iphathwa ngesisombululo se-alkaline, esidla ngokuba yi-sodium hydroxide (NaOH), ukuze kusebenze amaqela e-hydroxyl kwi-cellulose chain.
3. Ukufakelwa kwe-ether:
   • I-etherification linyathelo eliphambili ekuvelisweni kwe-HPMC. I-alkalized cellulose ixutywa ne-propylene oxide (yamaqela e-hydroxypropyl) kunye ne-methyl chloride (yamaqela e-methyl) ukuze kungeniswe la maqela e-ether kwi-cellulose backbone.
4. Ukungathathi cala kunye nokuhlamba:
   • I-cellulose eguquliweyo ephumayo, ngoku eyiHydroxypropyl Methyl Cellulose, idlula kwinkqubo yokunganyamezeli ukususa nayiphi na i-alkali eseleyo. Emva koko iyahlanjwa kakuhle ukuze kususwe ukungcola kunye nemveliso eshiyekileyo.
5. Ukomisa kunye nokusila:
   • I-cellulose eguquliweyo iyomiswa ukuze kususwe umswakama ogqithisileyo ize emva koko igaywe ibe ngumgubo ocolekileyo. Ubungakanani bezinto ezincinci bunokulawulwa ngokusekelwe kwindlela ekucetywayo ukuyisebenzisa.

Imveliso ye-HPMC ephumayo yipowder emhlophe okanye engemhlophe enemigangatho eyahlukeneyo ye-hydroxypropyl kunye ne-methyl substitution. Iimpawu ezithile ze-HPMC, ezifana nokunyibilika kwayo, i-viscosity, kunye nezinye iimpawu zokusebenza, zixhomekeke kwinqanaba lokutshintshwa kunye nenkqubo yokwenziwa.

Kubalulekile ukuqaphela ukuba i-HPMC yi-semi-synthetic polymer, kwaye nangona ithathwe kwi-cellulose yendalo, itshintsha kakhulu iikhemikhali ngexesha lenkqubo yokuvelisa ukuze ifezekise iipropati zayo ezifunekayo kwizicelo ezahlukeneyo zoshishino.