Hydroxypropyl methylcellulose ndi polima yotchuka yosungunuka m'madzi yomwe imapanga yankho lomveka bwino komanso lokhazikika m'madzi ndipo imagwiritsidwa ntchito kwambiri m'makampani opanga mankhwala, chakudya ndi zomangamanga. Ndizinthu zopangira ma cellulose zomwe sizimapangidwa ndi ionic zomwe zimapangitsa kuti pakhale mgwirizano komanso wogwirizana wa chinthu chomaliza. Pofuna kuonetsetsa kuti hydroxypropyl methylcellulose ikugwira ntchito bwino kwambiri, mankhwalawa amayenera kuyesedwa ndi kuyenerera asanagwiritsidwe ntchito. M'nkhaniyi, tikambirana njira zitatu zodalirika zodziwira ubwino wa hydroxypropyl methylcellulose.
1. Mayeso a viscosity
Kukhuthala kwa hydroxypropyl methylcellulose ndikofunikira kudziwa mtundu wake. Viscosity ndi kukana kwa madzimadzi kuyenda ndipo amayesedwa mu centipoise (cps) kapena mPa.s. Kukhuthala kwa hydroxypropyl methylcellulose kumasiyanasiyana malinga ndi kulemera kwake kwa maselo ndi kuchuluka kwake m'malo. Kukwera kwa digiri ya m'malo, kumachepetsa kukhuthala kwa mankhwalawa.
Kuyesa mamasukidwe akayendedwe a hydroxypropyl methylcellulose, sungunulani pang'ono mankhwalawa m'madzi ndikugwiritsa ntchito viscometer kuyeza kukhuthala kwa yankho. Kukhuthala kwa njira yothetsera vutoli kuyenera kukhala mkati mwazomwe zimaperekedwa ndi wogulitsa mankhwala. Chinthu chabwino cha hydroxypropyl methylcellulose chiyenera kukhala ndi kukhuthala kosasinthasintha, chomwe chimasonyeza chiyero ndi kukula kwa tinthu ting'onoting'ono.
2. Mayeso olowa m'malo
Mlingo wolowa m'malo umanena za kuchuluka kwa magulu a hydroxyl pa cellulose m'malo mwa magulu a hydroxypropyl kapena methyl. Mlingo woloweza m'malo ndi chizindikiro cha chiyero cha mankhwala, kuchuluka kwa kulowetsedwa m'malo, ndikoyera kwambiri. Zogulitsa zapamwamba za hydroxypropyl methylcellulose ziyenera kukhala ndi malo apamwamba.
Kuyesa mlingo wa m'malo, titration ikuchitika ndi sodium hydroxide ndi hydrochloric acid. Dziwani kuchuluka kwa sodium hydroxide yofunikira kuti muchepetse hydroxypropyl methylcellulose ndikuwerengera kuchuluka kwa m'malo pogwiritsa ntchito njira iyi:
Degree of Substitution = ([Volume of NaOH] x [Molarity of NaOH] x 162) / ([Kulemera kwa Hydroxypropyl Methyl Cellulose] x 3)
Mlingo wolowa m'malo uyenera kukhala mkati mwa mulingo wovomerezeka woperekedwa ndi wogulitsa. Mlingo wolowa m'malo mwazinthu zapamwamba za hydroxypropyl methylcellulose ziyenera kukhala mkati mwazovomerezeka.
3. Mayeso osungunuka
Kusungunuka kwa hydroxypropyl methylcellulose ndi gawo lina lofunikira lomwe limatsimikizira mtundu wake. Chogulitsacho chiyenera kusungunuka mosavuta m'madzi osati kupanga zotupa kapena gel. Zogulitsa zapamwamba za hydroxypropyl methylcellulose ziyenera kusungunuka mwachangu komanso mofanana.
Kuti muyese kusungunuka, sungunulani pang'ono mankhwala m'madzi ndikugwedeza yankho mpaka kusungunuka kwathunthu. Njira yothetsera vutoli iyenera kukhala yomveka bwino komanso yopanda zotupa kapena gel. Ngati mankhwalawo sasungunuka mosavuta kapena apanga zotupa kapena ma gelisi, zitha kukhala chizindikiro chotsika.
Pomaliza, hydroxypropyl methylcellulose ndi zopangira zamtengo wapatali zomwe zimagwiritsidwa ntchito m'mafakitale osiyanasiyana. Pofuna kuonetsetsa kuti mankhwalawo ndi apamwamba kwambiri, kuyesedwa kwa viscosity, m'malo ndi kusungunuka kumachitika. Mayeserowa adzakuthandizani kumvetsetsa bwino makhalidwe a mankhwala ndikuthandizira kusiyanitsa ubwino wake. Hydroxypropyl methylcellulose yapamwamba imakhala ndi kukhuthala kosasinthasintha, kulowetsedwa kwakukulu, ndipo imasungunuka mofulumira komanso mofanana m'madzi.
Nthawi yotumiza: Jul-11-2023