Kuweruza mtundu wa hydroxypropyl methyl cellulose

Tsopanohydroxypropyl carboxymethyl cellulosekugulitsa msika mochulukirachulukira, mtengo wake suli bwino, momwe mungachotsere msanga mtundu wa hydroxypropyl methyl cellulose wakhala vuto lalikulu! Ndiye mungaweruze bwanji mtundu wa hydroxypropyl methylcellulose? Chinthu choyamba kuyang'ana ndi kuyera kwa hydroxypropyl cellulose; Ngakhale zoyera sizingadziwike ngati HPMC ndi yoyenera kugwiritsidwa ntchito, koma pokonzekera palinso opanga ena oyipa adzawonjezera chothandizira choyera, chidzavulaza khalidwe lake. Koma nthawi zambiri, ma ether abwino kwambiri a cellulose ndi oyera bwino.

Chachiwiri, kuona ubwino wa hydroxypropyl methyl cellulose: hydroxypropyl carboxymethyl cellulose tinthu kukula kwa 80-100 mauna, 120 mauna zochepa, hydroxyethyl mapadi HECHPMC za 100 mauna. HPMC ambiri 60-80 mauna, ambiri methyl cellulose softer, ndi kubalalitsidwa bwino.

Njira yothetsera kumveka bwino kwa cellulose ether:Mtengo wa HPMCkuika m'madzi kutulutsa mandala colloid njira, kuona apamwamba kusamvana, ndi apamwamba kusamvana, kuti si kupasuka mankhwala mankhwala ndi m'munsi.

Chinthucho chikatenthedwa, chimapangidwa ndi gelatinized kapena kuikidwa m'magulu ndipo kenako chimasungunuka. Ndi hydrophobic komanso sungunuka m'madzi. Konkire ndiye chinsinsi chomangirira ndikuchotsa zopangira za ufa wosamva madzi. Mfundo yake yosagwira madzi ili motere: Powonjezera madzi ndi kusonkhezera ufa wa latex wopangidwanso ndi simenti, ufa wa latex umabwereranso ku mawonekedwe oyambirira a emulsion, ndipo tinthu ta latex timamwazikana mofanana mu phala la simenti. Simenti ikakumana ndi madzi, hydration reaction imayamba, ndipo yankho la Ca (OH) 2 limafikira machulukitsidwe ndi kutulutsa makristasi, ndipo nthawi yomweyo, makristasi a ettringite ndi calcium silicate hydrate colloids amapangidwa. Tinthu ta latex timayikidwa pa gel osakaniza ndi tinthu tating'ono ta simenti topanda madzi. Ndi kupita patsogolo kwa hydration zimachitikira, hydration mankhwala akuchulukirachulukira, ndi lalabala particles pang'onopang'ono anasonkhana opanda zinthu zakuthupi monga simenti, ndi kupanga pafupi kudzikundikira wosanjikiza pamwamba pa simenti gel osakaniza. Chifukwa cha kuchepa kwapang'onopang'ono madzi owuma, The mwamphamvu ankanyamula redispersed latex particles mu gels ndi voids condense kupanga mosalekeza filimu, kupanga osakaniza simenti phala interpenetrating masanjidwewo, ndi kugwirizana ndi simenti phala ndi aggregates ena ufa.