Udindo ndi mfundo yosungira madzi ya hydroxypropyl methylcellulose HPMC

Hydroxypropyl methylcellulose (HPMC) ndi ether yosakhala ionic cellulose yopangidwa kuchokera ku cellulose yachilengedwe ya polima kudzera munjira zingapo zama mankhwala. Ndi ufa woyera wopanda fungo, wopanda poizoni komanso wopanda poizoni womwe umatuluka m'madzi ozizira kapena owoneka bwino. Lili ndi makulidwe, kumanga, kubalalika, emulsifying, kupanga mafilimu, kuyimitsa, kutsatsa, kutsekemera, kugwiritsira ntchito pamwamba, kusunga chinyezi komanso kuteteza colloid. Hydroxypropyl methylcellulose ndi methylcellulose angagwiritsidwe ntchito zomangira, makampani utoto, kupanga utomoni, makampani ceramic, mankhwala, chakudya, nsalu, ulimi, tsiku mankhwala ndi mafakitale ena.

Hydroxypropyl methylcellulose HPMC Chemical equation:
[C6H7O2(OH)3-mn(OCH3)m(OCH2CH(OH)CH3)n]x

Mphamvu yosungira madzi ndi mfundo ya hydroxypropyl methylcellulose HPMC:
Cellulose ether HPMCmakamaka amatenga gawo la kusunga madzi ndi thickening mu matope simenti ndi gypsum-based slurry, ndipo akhoza bwino kusintha mphamvu yogwirizana ndi sag kukana kwa slurry.

Zinthu monga kutentha kwa mpweya, kutentha ndi kuthamanga kwa mphepo zidzakhudza kusinthasintha kwa madzi mumatope a simenti ndi zinthu zopangidwa ndi gypsum. Chifukwa chake, munyengo zosiyanasiyana, pali kusiyana kwina pakusunga madzi pazinthu zomwe zili ndi kuchuluka komweko kwa HPMC. Pakumanga kwapadera, mphamvu yosungira madzi ya slurry imatha kusinthidwa ndikuwonjezera kapena kuchepetsa kuchuluka kwa HPMC yowonjezeredwa. Kusungidwa kwa madzi kwa methyl cellulose ether pansi pa kutentha kwakukulu ndi chizindikiro chofunikira kusiyanitsa ubwino wa methyl cellulose ether. Zabwino kwambiri HPMC mndandanda mankhwala angathe kuthetsa vuto la posungira madzi pansi kutentha. M'nyengo zotentha kwambiri, makamaka m'malo otentha komanso owuma komanso zomangira zowonda kwambiri kumbali yadzuwa, HPMC yapamwamba imafunika kuti ipititse patsogolo kusunga madzi kwa slurry. HPMC yapamwamba kwambiri imakhala yabwino kwambiri. Magulu ake a methoxyl ndi hydroxypropoxyl amagawidwa mofanana pamagulu a cellulose maselo, omwe amatha kupititsa patsogolo luso la maatomu a okosijeni pamagulu a hydroxyl ndi ether kuti agwirizane ndi madzi kuti apange ma hydrogen bond. , kotero kuti madzi aulere amakhala madzi omangika, kuti athe kuwongolera bwino kutuluka kwa madzi chifukwa cha kutentha kwanyengo, ndikukwaniritsa kusunga madzi kwapamwamba.

apamwamba mapadi HPMC akhoza uniformly ndi mogwira omwazika mu simenti matope ndi gypsum ofotokoza mankhwala, ndi kukulunga particles onse olimba, ndi kupanga kunyowa filimu, chinyezi m'munsi ndi pang'onopang'ono anamasulidwa kwa nthawi yaitali, ndi zolengedwa guluu The hydration anachita wa coagulated zakuthupi adzaonetsetsa mphamvu chomangira ndi compressive mphamvu zakuthupi. Chifukwa chake, pakumanga kwanyengo yachilimwe yotentha kwambiri, kuti mukwaniritse kusungirako madzi, ndikofunikira kuwonjezera zinthu zamtundu wa HPMC pamlingo wokwanira molingana ndi chilinganizo, apo ayi, padzakhala hydration osakwanira, kuchepetsedwa mphamvu, kusweka, kukumba. ndi kukhetsa chifukwa cha kuyanika kwambiri. mavuto, komanso kuonjezera zovuta zomangamanga ogwira ntchito. Pamene kutentha kumatsika, kuchuluka kwa madzi a HPMC omwe amawonjezeredwa akhoza kuchepetsedwa pang'onopang'ono, ndipo zotsatira zofanana zosungira madzi zimatha kutheka.

Kusungidwa kwa madzi kwa mankhwala a hydroxypropyl methylcellulose HPMC pawokha kumakhudzidwa ndi izi:

1. Kufanana kwa cellulose ether HPMC
HPMC, methoxyl ndi hydroxypropoxyl zimagawidwa mofanana, ndipo chiwerengero chosungira madzi ndichokwera kwambiri.

2. Selulosi etha HPMC kutentha gel osakaniza kutentha
Kutentha kwa gel osakaniza kumapangitsa kuti madzi asapitirire; apo ayi, kutsika kwa madzi osungira madzi.

3. Ma cellulose Etere HPMC Viscosity
Pamene mamasukidwe akayendedwe a HPMC akuwonjezeka, kuchuluka kwa madzi osungirako kumawonjezekanso; pamene mamasukidwe akayendedwe akufika pamlingo wina, kuwonjezeka kwa madzi osungira madzi kumakhala kofatsa.

4. Kuwonjezera kuchuluka kwa cellulose ether HPMC
Kuchulukitsitsa kwa cellulose ether HPMC kuwonjezeredwa, kukwezera kuchuluka kwa madzi osungira komanso kumapangitsa kuti madzi asungidwe bwino. Pakati pa 0.25-0.6% yowonjezera, kuchuluka kwa madzi osungira madzi kumawonjezeka mofulumira ndi kuwonjezeka kwa ndalama zowonjezera; pamene kuchuluka kwa madzi kumawonjezeka, kuchuluka kwa madzi kumachepetsedwa.