Hydroxypropyl methylcellulose, yotchedwa: HPMC kapena MHPC.Maonekedwe ndi ufa woyera kapena woyera;ntchito yaikulu ndi ngati dispersant kupanga polyvinyl kolorayidi, ndipo ndi waukulu wothandizira pokonza PVC ndi kuyimitsidwa polymerization.Pomanga makampani omangamanga, amagwiritsidwa ntchito makamaka pomanga makina monga kumanga khoma, pulasitala, caulking, etc.;makamaka pomanga zokongoletsera, amagwiritsidwa ntchito kuyika matailosi a ceramic, marble, ndi zokongoletsera zapulasitiki.Zili ndi mphamvu zomangirira kwambiri ndipo zimatha kuchepetsa kuchuluka kwa simenti..Amagwiritsidwa ntchito ngati thickener mumakampani opanga utoto, omwe amatha kupanga wosanjikiza kukhala wowala komanso wosakhwima, kupewa kuchotsa ufa, kukonza magwiridwe antchito, ndi zina zambiri.
Mumatope a simenti ndi gypsum-based slurry, hydroxypropyl methylcellulose makamaka imagwira ntchito yosungira madzi ndi kukhuthala, zomwe zingathe kupititsa patsogolo mphamvu yogwirizana ndi kukana kwa slurry.
Zinthu monga kutentha kwa mpweya, kutentha ndi kuthamanga kwa mphepo zidzakhudza kusungunuka kwa madzi mumatope a simenti ndi zinthu zopangidwa ndi gypsum.Chifukwa chake, munyengo zosiyanasiyana, pali kusiyana kwina pakusunga madzi pazinthu zomwe zili ndi kuchuluka kofanana kwa hydroxypropyl methylcellulose.
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 za hydroxypropyl methylcellulose mndandanda zimatha kuthetsa vuto la kusunga madzi kutentha kwambiri.M'nyengo zotentha kwambiri, makamaka m'malo otentha komanso owuma komanso zomangira zowonda kumbali yadzuwa, HPMC yapamwamba imafunikira kuti ipititse patsogolo kusunga madzi kwa slurry.
HPMC yapamwamba kwambiri imakhala yabwino kwambiri.Magulu ake a methoxy ndi hydroxypropoxy 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.
Madzi amafunikira hydration kuti akhazikitse zida za simenti monga simenti ndi gypsum.Kuchuluka koyenera kwa HPMC kumatha kusunga chinyezi mumtondo kwa nthawi yayitali kotero kuti kukhazikitsa ndi kuumitsa kupitirire.
Kuchuluka kwa HPMC kofunikira kuti mupeze madzi okwanira osungirako kumadalira:
1. The absorbency wa maziko wosanjikiza
2. Mapangidwe a matope
3. matope wosanjikiza makulidwe
4. Kufuna madzi kwa matope
5. Nthawi yoyika ma gelling
Apamwamba hydroxypropyl methylcellulose akhoza uniformly ndi mogwira omwazikana mu simenti matope ndi gypsum ofotokoza mankhwala, ndi kukulunga particles onse olimba, ndi kupanga chonyowa filimu, ndi chinyezi m'munsi ndi pang'onopang'ono anamasulidwa kwa nthawi yaitali , ndi hydration reaction ndi inorganic gelling zakuthupi kuonetsetsa mphamvu yolumikizana ndi mphamvu yopondereza ya zinthuzo.
Choncho, pomanga chilimwe chotentha kwambiri, kuti mukwaniritse kusungirako madzi, m'pofunika kuwonjezera mankhwala apamwamba a HPMC pamlingo wokwanira molingana ndi chilinganizo, apo ayi, padzakhala hydration yosakwanira, mphamvu yochepa, kusweka, kuphulika. 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.
Nthawi yotumiza: Jan-16-2023