Kuchuluka kwa kukhuthala kwa hydroxypropyl methylcellulose kumapangitsa kuti madzi asungidwe bwino. Viscosity ndi gawo lofunikira la magwiridwe antchito a HPMC. Pakali pano, opanga osiyanasiyana HPMC ntchito njira zosiyanasiyana ndi zida kuyeza mamasukidwe akayendedwe a HPMC. Njira zazikulu ndi HaakeRotovisko, Hoppler, Ubbelohde ndi Brookfield.
Kwa mankhwala omwewo, zotsatira za viscosity zoyezedwa ndi njira zosiyanasiyana ndizosiyana kwambiri, ndipo zina zimakhala zosiyana kawiri. Chifukwa chake, poyerekeza kukhuthala, kuyenera kuchitidwa pakati pa njira zoyesera zomwezo, kuphatikiza kutentha, rotor, ndi zina.
Ponena za kukula kwa tinthu tating'onoting'ono, tinthu tating'onoting'ono timasunga bwino madzi. Pambuyo pa tinthu tating'ono ta cellulose ether takumana ndi madzi, pamwamba pake nthawi yomweyo amasungunuka ndikupanga gel osakaniza kuti ateteze mamolekyu amadzi kuti asapitirire kulowa. Nthawi zina sangathe kumwazikana mofanana ndi kusungunuka ngakhale atagwedezeka kwa nthawi yaitali, kupanga njira yothetsera mitambo kapena agglomeration. Zimakhudza kwambiri kusungidwa kwamadzi kwa cellulose ether, ndipo kusungunuka ndi chimodzi mwazinthu zomwe zimasankha cellulose ether.
Fineness ndiwonso index yofunikira ya methyl cellulose ether. The MC ntchito youma ufa matope chofunika kukhala ufa, ndi otsika madzi okhutira, ndi fineness amafunanso 20% -60% ya tinthu kukula kukhala zosakwana 63um. Kuchita bwino kumakhudza kusungunuka kwa hydroxypropyl methylcellulose ether. Coarse MC nthawi zambiri imakhala granular, ndipo ndiyosavuta kusungunuka m'madzi popanda agglomeration, koma kusungunuka kumakhala pang'onopang'ono, kotero sikoyenera kugwiritsidwa ntchito mumatope a ufa wouma.
Mu matope owuma a ufa, MC imamwazikana pakati pa zinthu zopangira simenti monga zophatikiza, zodzaza bwino ndi simenti, ndipo ufa wokwanira wokwanira ungapewe methyl cellulose ether agglomeration mukasakaniza ndi madzi. Pamene MC imawonjezeredwa ndi madzi kuti asungunuke ma agglomerates, zimakhala zovuta kwambiri kumwazikana ndi kupasuka. Coarse fineness wa MC sikungowononga, komanso kumachepetsa mphamvu yakomweko ya matope. Pamene matope owuma owuma akugwiritsidwa ntchito m'dera lalikulu, kuthamanga kwa machiritso a matope owuma a m'deralo kudzachepetsedwa kwambiri, ndipo ming'alu idzawoneka chifukwa cha nthawi zosiyanasiyana zochiritsira. Kwa matope opopera omwe amapangidwa ndi makina, kufunikira kwa fineness ndipamwamba chifukwa cha nthawi yochepa yosakaniza.
Nthawi zambiri, kukwezeka kwa mamachulukidwe kumapangitsa kuti madzi asungidwe bwino. Komabe, kukwezeka kwa mamachulukidwe apamwamba komanso kulemera kwa mamolekyu a MC, kutsika kofananirako kusungunuka kwake kudzakhala ndi zotsatira zoyipa pamphamvu ndi ntchito yomanga ya matope. The apamwamba mamasukidwe akayendedwe, ndi zoonekeratu kwambiri thickening zotsatira pa matope, koma si mwachindunji molingana. Kukwera kwa mamasukidwe akayendedwe, m'pamenenso matope onyowa amakhala owoneka bwino kwambiri, ndiye kuti, pakumanga, amawonetsedwa ngati kumamatira ku scraper ndi kumamatira kwakukulu ku gawo lapansi. Koma sizothandiza kuwonjezera mphamvu zamapangidwe a dothi lonyowa palokha. Pakumanga, ntchito yotsutsa-sag sizowonekera. M'malo mwake, ma viscosity ena apakati komanso otsika koma osinthidwa a methyl cellulose ethers ali ndi ntchito yabwino kwambiri pakuwongolera mphamvu zamapangidwe amatope onyowa.
Kuchuluka kwa cellulose ether kuwonjezeredwa kumatope, kumapangitsa kuti madzi asamasungidwe bwino, komanso kukwezeka kwa viscosity, ndi bwino kusunga madzi.
Ubwino wa HPMC umakhudzanso kusungidwa kwa madzi. Nthawi zambiri, ma etha a methyl cellulose okhala ndi kukhuthala kofanana koma fineness yosiyana, pansi pa kuchuluka komweko, kuwongolera bwino kumapangitsa kuti madzi asungidwe bwino.
Kusungidwa kwa madzi kwa HPMC kumagwirizananso ndi kutentha komwe kumagwiritsidwa ntchito, ndipo kusunga madzi kwa methyl cellulose ether kumachepa ndi kuwonjezeka kwa kutentha. Komabe, muzinthu zenizeni, matope a ufa wowuma nthawi zambiri amagwiritsidwa ntchito kumalo otentha kwambiri (oposa madigiri 40) m'madera ambiri, monga kunja kwa khoma la putty pulasitala pansi pa dzuwa m'chilimwe, zomwe nthawi zambiri zimathandizira Kuchiritsa simenti ndi kuumitsa kwa simenti. ufa wouma matope.
Kutsika kwa kuchuluka kwa madzi osungira madzi kumabweretsa kumverera koonekeratu kuti zonse zogwira ntchito komanso kukana kwa ming'alu zimakhudzidwa, ndipo ndizofunikira kwambiri kuchepetsa mphamvu ya kutentha pansi pa chikhalidwe ichi. Ngakhale kuti zowonjezera za methyl hydroxyethyl cellulose ether panopa zimaonedwa kuti ndizo patsogolo pa chitukuko cha zamakono, kudalira kwawo kutentha kudzapitirizabe kufooketsa ntchito ya ufa wouma.
Wonjezerani kuchuluka kwa methyl hydroxyethyl cellulose, kugwirira ntchito ndi kukana kwa crack sikungakwaniritse zosowa zogwiritsa ntchito. Kupyolera mu chithandizo chapadera pa MC, monga kuonjezera mlingo wa etherification, ndi zina zotero, zotsatira zosungira madzi zimatha kusungidwa pa kutentha kwakukulu, kotero kuti zitha kupereka ntchito yabwino pansi pa zovuta.
Nthawi yotumiza: Apr-10-2023