The wamkulu mamasukidwe akayendedwe aMtengo wa HPMChydroxypropyl methyl cellulose, kumapangitsa kuti madzi asungidwe bwino. Viscosity ndi gawo lofunikira la magwiridwe antchito a HPMC. Pakali pano, opanga osiyana HPMC ntchito njira zosiyanasiyana ndi zida kudziwa mamasukidwe akayendedwe a HPMC. Njira zazikulu ndi Haake Rotovisko, Hoppler, Ubbelohde ndi Brookfield, etc.
Kwa mankhwala omwewo, zotsatira za viscosity zoyesedwa ndi njira zosiyanasiyana ndizosiyana kwambiri, zina zimakhala zosiyana. Chifukwa chake, poyerekeza mamasukidwe akayendedwe, ayenera kuchitidwa pakati pa njira yoyesera yofananira, kuphatikiza kutentha, rotor, ndi zina.
Pa kukula kwa tinthu tating'onoting'ono, tinthu tating'onoting'ono timasunga bwino madzi. Large particles wa mapadi etere kukhudzana ndi madzi, pamwamba yomweyo kupasuka ndi kupanga gel osakaniza kukulunga zinthu kuteteza madzi mamolekyu kupitiriza kudutsa, nthawi zina yaitali yogwira ntchito sangathe wogawana omwazika kusungunuka, mapangidwe matope flocculent njira kapena agglomerate. Kusungunuka kwa cellulose ether ndi chimodzi mwazinthu zomwe mungasankhe cellulose ether. Fineness ndiwonso index yofunikira ya methyl cellulose ether. MC kwa matope youma amafuna ufa, otsika madzi okhutira, ndi fineness wa 20% ~ 60% tinthu kukula zosakwana 63um. Fineness imakhudza kusungunuka kwaMtengo wa HPMChydroxypropyl methyl cellulose ether. Coarse MC kawirikawiri granular ndipo mosavuta kusungunuka m'madzi popanda agglomerating, koma Kutha liwiro ndi wodekha kwambiri, kotero si oyenera ntchito youma matope. Mu matope owuma, MC imamwazikana pakati pa zophatikiza, zodzaza bwino ndi zopangira simenti monga simenti, ndi ufa wokha womwe uli wokwanira ungapewe kuphatikizika kwa methyl cellulose ether posakanikirana ndi madzi. Pamene MC akuwonjezera madzi kupasuka agglomerate, ndi kovuta kumwazikana ndi kupasuka izo. MC ndi coarse fineness osati zinyalala, komanso amachepetsa m'deralo mphamvu ya matope. Pamene matope owuma otere amangidwa m'dera lalikulu, liwiro la kuchiritsa la matope owuma a m'deralo limachepetsedwa kwambiri, zomwe zimabweretsa kusweka chifukwa cha nthawi yochiritsa yosiyana. Kwa makina opopera matope, chifukwa cha nthawi yochepa yosakaniza, ubwino ndi wapamwamba.
Nthawi zambiri, kukwezeka kwa mamachulukidwe kumapangitsa kuti madzi asungidwe bwino. Komabe, kukhuthala kwake kukakhala kokwezeka, kulemera kwa mamolekyu a MC ndikokwera kwambiri, ndipo kusungunuka kumachepa mofanana, zomwe zimakhudza mphamvu ndi ntchito yomanga yamatope. The apamwamba mamasukidwe akayendedwe, zoonekeratu kwambiri thickening zotsatira za matope, koma si wofanana ubale. Kukwera kwa viscosity, matope onyowa adzakhala omata kwambiri, zomangamanga zonse, ntchito ya scraper yomata komanso kumamatira kwambiri kuzinthu zoyambira. Koma sizothandiza kuwonjezera mphamvu zamapangidwe amatope onyowa. Pakumanga, ntchito yotsutsa-sag sizowonekera. M'malo mwake, ma viscosity ena otsika koma osinthidwa a methyl cellulose ether ali ndi ntchito yabwino kwambiri pakuwongolera mphamvu zamapangidwe amatope onyowa.
Kuchuluka kwa cellulose ether kumawonjezeredwa kumatope, kusungirako madzi kwabwinoko, kumapangitsa kuti ma viscosity akhale apamwamba, ntchito yabwino yosungira madzi.
HPMC fineness imakhalanso ndi zotsatira zina pa kusunga madzi ake, kawirikawiri kulankhula, kwa mamasukidwe akayendedwe ofanana ndi fineness osiyana wa methyl cellulose efa, mu nkhani ya kuchuluka komweko kuwonjezera, finer mphamvu posungira madzi ndi bwino.
Kusungidwa kwa madzi kwa HPMC kumagwirizananso ndi kutentha kwa ntchito, ndipo kusungidwa kwa madzi kwa methyl cellulose ether kumachepa ndi kukwera kwa kutentha. Koma muzogwiritsidwa ntchito zenizeni, malo ambiri amatope owuma nthawi zambiri amakhala otentha kwambiri (opitilira madigiri 40) pansi pamikhalidwe yomanga mu gawo lapansi lotentha, monga chilimwe insolation ya kunja khoma putty pulasitala, amene nthawi zambiri imathandizira kulimba kwa simenti ndi kuumitsa matope. Kuchepa kwa kuchuluka kwa kusungirako madzi kumabweretsa kumverera koonekeratu kuti zonse zomanga ndi kukana kusweka zimakhudzidwa. Mu chikhalidwe ichi, kuchepetsa chikoka cha kutentha zinthu kumakhala kovuta kwambiri. Ngakhale kuti chowonjezera cha methyl hydroxyethyl cellulose ether chimaonedwa kuti chili patsogolo pa chitukuko cha zamakono, kudalira kwake kutentha kudzachititsabe kufowoka kwa zinthu zamatope owuma. Ngakhale kuchuluka kwa mlingo wa methyl hydroxyethyl cellulose (chilinganizo cha chilimwe), kumanga ndi kukana kusweka sikungakwaniritse zosowa zogwiritsidwa ntchito. Kupyolera mu chithandizo chapadera cha MC, monga kuonjezera mlingo wa etherification, mphamvu yosungira madzi ya MC ikhoza kukhala ndi zotsatira zabwino pa kutentha kwakukulu, kotero kuti ikhoza kupereka ntchito yabwino pansi pa zovuta.
Nthawi yotumiza: May-18-2022