Hydroxypropyl Methylcellulose (HPMC)ni eteri ya cellulose ikoreshwa cyane idafite ionic, ikoreshwa cyane mu bikoresho by'ubwubatsi, mu miti, mu biribwa, mu gusiga irangi, no mu bindi bice. Gukomera kwayo mu mikorere no mu bwiza bigira ingaruka ku ngaruka z'umusaruro wa nyuma; bityo, igeragezwa rya HPMC mu gihe cyo gukora no gukoresha ni ingenzi cyane.
1. Isuzuma ry'imiterere n'umutungo fatizo
Mbere yo gupima, icyitegererezo kibanza kugaragara. HPMC nziza cyane igomba kuba ifu yera cyangwa idasa n'umweru kandi ishobora gutemba neza, idafite udusebe, impumuro mbi, cyangwa umwanda. Umuti wayo w'amazi ugomba kuba ubonerana cyangwa ufite amazi make, nta kintu kigaragara gihagaze. Nyuma y'ibyo, amazi aboneka, akenshi hakoreshejwe isesengura ry'ubushuhe bwa infrared cyangwa uburyo bwo kumisha (uburyo bwo gupima uburemere buhoraho bwa 105℃). Ibikoresho byujuje ubuziranenge muri rusange bifite ubushuhe buri munsi ya 5%.
Kumenya ingano y'ivu bigaragaza ingano y'umwanda utari uwo mu bwoko bwa 'inorganic'. Icyitegererezo gishyirwa mu itanura rifunze ku bushyuhe bwa 550°C kugeza ku buremere buhoraho. Ubusanzwe ingano y'ivu igomba kutarenga 1.5%. Ingano y'ivu irenze urugero izagira ingaruka ku mucyo no ku buryo ritahinduka.
2. Isuzuma ry'ubukana bw'imitsi
Ubushyuhe ni kimwe mu bimenyetso by'ingenzi by'imikorere ya HPMC, bigena mu buryo butaziguye ububyimba bwayo, kubika amazi, n'ingaruka zayo mu gukora filime. Isuzuma rikorwa muri rusange hakoreshejwe viscometer izunguruka (nk'iy'ishusho ya Brookfield) cyangwa viscometer ya Ubbelohde capillary.
Mu gihe cyo gupima, igipimo runaka (ubusanzwe 2%) cy'umuti w'amazi wa HPMC gipimwa ku bushyuhe bwagenwe (muri rusange 20 ± 0.1℃). Ubwoko butandukanye bwa HPMC bufite ingano zitandukanye cyane z'ubushyuhe, nka 400, 15000, na 100000 mPa·s. Ubushyuhe bwapimwe bugomba guhuza n'urwego rw'ibicuruzwa bisanzwe; bitabaye ibyo, bigaragaza ko urwego rwa polymerization cyangwa gusimbuza rwayo rudahindagurika.
3. Isuzuma ry'Ingano yo Gusimbuza (Ibikubiye muri Methoxy na Hydroxypropoxy)
Imikorere ya HPMC iterwa ahanini n'ibikubiye mu bisimbura.
Ibikubiye muri methoxy (–OCH₃) bigira ingaruka ku gushonga, ubushyuhe bwa gel, n'imikorere y'ubuso;
Ingano ya hydroxypropoxy (–OCH₂CHOHCH₃) igira ingaruka ku bworoherane n'uburyo amazi abikwa.
Uburyo bwo kumenya ubusanzwe bukoresha titration ya chemical cyangwa chromatography ya gaz. Urugero, nyuma yo gushonga aside hydrolysis, icyitegererezo gitanga alcohols zijyanye nayo, hanyuma zigasesengurwa hifashishijwe titration cyangwa chromatography. Ibikoresho bya HPMC byujuje ibisabwa ubusanzwe birimo 19%–24% bya methoxyl na 4%–12% bya hydroxypropoxyl.
4. Gupima ubushyuhe bwa Gel
Imiterere ya thermogel ya HPMC ni ikintu cy'ingenzi kiyitandukanya n'izindi ether za cellulose. Mu gihe cyo kugerageza, umuti w'amazi wa HPMC ushyuha buhoro buhoro kandi ugakururwa, kandi ubushyuhe aho umuti uhinduka kuva ku gipimo cy'ubushyuhe ujya ku gipimo cy'ubushyuhe bw'umuti bufatwa nk'ubushyuhe bwa gel.
Muri rusange, HPMC ifite methoxyl nyinshi ifite ubushyuhe buke bwa gel, mu gihe hydroxypropoxyl nyinshi ituma ubushyuhe buke bwa gel buzamuka. Iki kimenyetso kijyanye n'uko ibicuruzwa bihamye mu mikoreshereze yabyo nko mu kubaka no gusiga ibinini.
5. Isuzuma ry'agaciro ka pH n'uburyo ishonga
Nyuma yo gutegura umuti wa HPMC wa 2%, pH yayo ipimwa hakoreshejwe igipimo cya pH. Ingano isanzwe ni 5.0–8.0. Muri urwo rugero, HPMC irahamye kandi ntabwo izahura n'ibintu byinshi bidakomoka ku bimera cyangwa inyongeramusaruro.
Ikizamini cyo gushonga gipima igipimo cyacyo cyo gushonga no gushonga mu mazi akonje. HPMC nziza cyane igomba gushonga vuba vuba mu kuvanga, igakora umuti umwe kandi ubonerana mu minota 30.
6. Gutahura Ubwiza n'Umwanda
Gupima ubuziranenge ahanini bikubiyemo ibizamini by’ibyuma biremereye, koloride, sulfate, n’imipaka ya mikorobe.
Ubusanzwe ingano y'icyuma gikomeye (nka Pb) ntigomba kurenza 20 ppm; chloride ≤ 0.2%, sulfate ≤ 0.5%;
Ku bijyanye n'imiti cyangwa ibiryo, umubare wose wa bagiteri, bagiteri za coliform, n'umusemburo ugomba gupimwa kugira ngo harebwe ko nta kibazo kirimo.
7. Isesengura rya Thermogravimetric na Fourier Transform Infrared Spectroscopy
Kugira ngo hasuzumwe neza imiterere n'ubushyuhe bwa HPMC, isesengura rya thermogravimetric (TGA) na Fourier transform infrared spectroscopy (FTIR) birashobora gukoreshwa.
TGA ishobora kubona impinduka mu bunini bwa HPMC ku bushyuhe butandukanye, bityo ikamenya ubushyuhe bwayo bwo kubora n'urugero rwo guhagarara kwayo;
FTIR isesengura imiterere y'itsinda ry'imikorere binyuze mu misozo y'ingufu, ikemeza ko hari imigozi iranga –OH, –OCH₃, na –OCH₂CHOHCH₃ yo kwinjizwa kugira ngo yemeze ko imiterere ya molekile ari yo ikwiye.
Isuzuma ryavuzwe haruguru rituma habaho isuzuma ryimbitse ry’imiterere ya fizikiki n’uko HPMC ikoreshwa neza. Ubukana, urwego rwo gusimbuza, n’ubushyuhe ni ibipimo by’ingenzi byo kugenzura ubuziranenge; mu gihe pH, ingano y’ivu, n’ubushyuhe bwo gupima bigaragaza urwego rwo gutunganya no gutunganya. Kubahiriza cyane ubu buryo bwo gupima ntibituma gusa ibicuruzwa bihora bihamye kandi bihoraho, ahubwo binatanga inkunga yizewe ku makuru ajyanye n’umutekano n’umutekano.ikoreshwa neza rya HPMCmu nganda nk'ubwubatsi, imiti, n'ibiribwa.
Igihe cyo kohereza: 31 Ukwakira 2025