Zotsatira za HPMC yokhala ndi kukhuthala kosiyana pa ntchito ya konkire

Hydroxypropyl methylcellulose (HPMC)ndi ether ya cellulose yosakhala ionic yomwe imagwiritsidwa ntchito kwambiri popanga zinthu zomangira, makamaka mu matope ndi konkriti wouma, zomwe zimagwira ntchito yosunga madzi, kukhuthala, komanso kukonza magwiridwe antchito omanga. Kagwiridwe ka ntchito ka HPMC kamakhudzidwa kwambiri ndi kukhuthala kwake, ndipo pali kusiyana koonekeratu pa ntchito ya HPMC yokhala ndi kukhuthala kosiyanasiyana mu konkriti.

1. Njira yoyambira yogwirira ntchito ya HPMC

HPMC ndi polima wosungunuka m'madzi womwe ungapange yankho lokhuthala kapena colloid m'madzi. Njira yake yayikulu yogwirira ntchito ndi iyi:

Kusunga madzi: HPMC imatha kutseka madzi osalowa mu simenti kumayambiriro kwa madzi, kupewa kutayika kwa madzi, ndikuwonetsetsa kuti madzi akuyenda bwino.

Kukhuthala: HPMC imatha kuonjezera kukhuthala kwa matope ndikuwonjezera kukana kugawanika ndi kusinthasintha kwa konkire.

Kupanga filimu: HPMC imatha kupanga filimu yosalekeza pamwamba panthawi yowumitsa, zomwe zimathandiza kulimbitsa mphamvu yolumikizirana pakati pa nkhope.

HPMC yokhala ndi kukhuthala kosiyanasiyana ili ndi magwiridwe antchito osiyanasiyana mu zotsatira zomwe zili pamwambapa, zomwe zimakhudza magwiridwe antchito a konkriti m'njira zosiyanasiyana.

2. Zotsatira zenizeni za kukhuthala kwa HPMC pa ntchito ya konkire

2.1. Zotsatira pa kusunga madzi

Kusunga madzi ndi chimodzi mwa zinthu zofunika kwambiri za HPMC. HPMC yokhala ndi kukhuthala kochepa (monga, yochepera 50,000 mPa·s) ili ndi kusungika kochepa kwa madzi ndipo ndi yoyenera machitidwe omwe amafunikira kutulutsa madzi mwachangu, monga pulasitiki. HPMC yokhala ndi kukhuthala kwapakati komanso kwakukulu (monga, 100,000 mpaka 200,000 mPa·s) imasunga bwino madzi mu konkire, zomwe zingalepheretse madzi kutuluka ndi kutuluka kwa madzi msanga, motero kuonetsetsa kuti simenti imanyowa nthawi zonse. Makamaka, kugwiritsa ntchito HPMC yokhala ndi kukhuthala kwakukulu m'malo ouma kapena m'malo onyowa kwambiri kungathandize kwambiri kukana kufooka ndi kukula kwa mphamvu konkire.

2.2. Zotsatira pa kugwira ntchito bwino

HPMC imatha kusintha kwambiri pulasitiki ndi kugwira ntchito kwa konkriti. Chifukwa cha kusungunuka kwake mwachangu, HPMC yokhala ndi kukhuthala kochepa imatha kufalikira mwachangu mu dongosolo, zomwe zimathandiza kusintha kukhuthala kwa chisakanizocho pakapita nthawi yochepa; koma kusintha kwake nthawi yosamalira kukhuthala sikuli bwino ngati kwa zinthu zokhala ndi kukhuthala kwakukulu. HPMC yokhala ndi kukhuthala kwakukulu imakhala ndi mphamvu yayikulu yokhuthala. Imatha kusintha bwino kusakanikirana kwa chisakanizocho mu konkriti, kuchepetsa kutuluka kwa magazi ndi kulekanitsa, koma kukhuthala kwakukulu kungayambitsenso kuchepa kwa kukhuthala kwa konkriti, ndipo n'zosavuta kuyambitsa mavuto monga kumamatira ku mbiya ndi kukana kupopa kwambiri panthawi yomanga. Chifukwa chake, pogwiritsira ntchito, ndikofunikira kusankha zinthu za HPMC zokhala ndi kukhuthala koyenera malinga ndi njira yomangira (monga kupaka pulasitala pamanja, kupopera, ndi kupopa).

2.3. Zotsatira pa nthawi yokhazikitsa

HPMC imachedwetsanso nthawi yoyika konkire, makamaka zinthu zapakatikati ndi zapamwamba kwambiri, zomwe zimakhala ndi tinthu ta simenti tolimba, zimaletsa kutulutsa kutentha kwa madzi, ndikuchedwetsa njira yoyika madzi ya simenti. Nthawi zambiri, pamene kukhuthala kwa HPMC kukuwonjezeka, chizolowezi chake chochedwetsa kukhazikitsa chimakhala chofunikira kwambiri. Pakumanga kwenikweni, kuchedwetsa kumeneku kumathandiza kuwonjezera nthawi yogwirira ntchito ya konkire, koma mlingo uyenera kulamulidwa nthawi yozizira kapena kutentha kochepa kuti tipewe nthawi yochulukirapo yoyika yomwe ingakhudze kupita patsogolo kwa polojekitiyi.

2.4. Zotsatira pakukula kwa mphamvu

HPMC yokha sichita nawo gawo pa hydration ya simenti, ndipo momwe imakhudzira mphamvu ya simenti imawonekera makamaka pagawo loyamba la kukula kwa mphamvu. Ngakhale kuti HPMC yokhala ndi kukhuthala kwakukulu imakhala ndi kusunga bwino madzi, imachedwetsa hydration, zomwe zingayambitse kuchepa kwa mphamvu yoyambirira. Komabe, pagawo lotsatira, chifukwa HPMC imasintha momwe madzi amakhalira ndikupangitsa kuti simenti ikhale yokwanira, mphamvu yocheperako imakhala yokhazikika kapena yabwino. Chifukwa chake, kusankha koyenera kwa HPMC yokhala ndi kukhuthala kwapakati kungaganizire mphamvu yoyambirira komanso kusunga bwino madzi, komwe ndi chisankho chabwino kwambiri.

2.5. Zotsatira pa makhalidwe ogwirizana

HPMCIkhozanso kulimbitsa mphamvu yake yolumikizirana ndi maziko a konkire kapena matope. Izi zimachitika chifukwa cha mphamvu zake zopangira filimu, komanso chifukwa cha kusinthasintha kwa kukhuthala ndi kugwirizana kwa matope. Kawirikawiri, HPMC yokhala ndi kukhuthala kwakukulu imatha kupanga mawonekedwe olumikizana okhuthala komanso osalekeza, motero imakulitsa mphamvu yolumikizirana. Komabe, pakugwiritsa ntchito moyenera, chisamaliro chiyenera kuperekedwa pakulinganiza momwe imakhudzira magwiridwe antchito omanga kuti tipewe zovuta pakukanda chifukwa cha kukhuthala kwakukulu.

Ma HPMC a kukhuthala kosiyanasiyana ali ndi ubwino ndi kuipa kwawo mu simenti.

Kukhuthala kochepa kwa HPMC: kusungunuka mwachangu, kugwira ntchito bwino, koma kusunga madzi pang'ono komanso kukhuthala kwake;

Kukhuthala kwapakati kwa HPMC (monga 70,000-150,000 mPa·s): poganizira kusunga madzi, kukhuthala ndi kugwirira ntchito, pakadali pano ndi mtundu womwe umagwiritsidwa ntchito kwambiri;

Kukhuthala kwakukulu kwa HPMC (kupitirira 200,000 mPa·s): Kusunga madzi bwino kwambiri, koma kumakhudza kwambiri kusinthasintha kwa madzi, koyenera kugwiritsidwa ntchito m'malo ogwirira ntchito omwe ali ndi zofunikira zambiri zowongolera kutuluka kwa madzi, monga matope a pamwamba ndi guluu wa matailosi pansi pa kutentha kwambiri kapena nyengo youma.