Hydroxypropyl methylcellulose, yotchedwa: HPMC kapena MHPC. Maonekedwe ake ndi ufa woyera kapena wosakhala woyera; ntchito yaikulu ndi ngati chosungunula popanga polyvinyl chloride, ndipo ndiye wothandizira wamkulu wokonzekera PVC ndi suspension polymerization. Mu ntchito yomanga makampani omanga, imagwiritsidwa ntchito makamaka pakupanga makina monga kumanga makoma, kupaka pulasitala, kuphimba makoma, ndi zina zotero; makamaka pakupanga zokongoletsera, imagwiritsidwa ntchito kuyika matailosi a ceramic, marble, ndi zokongoletsa za pulasitiki. Ili ndi mphamvu yayikulu yolumikizira ndipo imatha kuchepetsa kuchuluka kwa simenti. . Imagwiritsidwa ntchito ngati chokhuthala mumakampani opanga utoto, chomwe chingapangitse kuti wosanjikizawo ukhale wowala komanso wofewa, kupewa kuchotsa ufa, kukonza magwiridwe antchito, ndi zina zotero.
Mu simenti ndi matope okhala ndi gypsum, hydroxypropyl methylcellulose imagwira ntchito makamaka posunga ndi kukhuthala kwa madzi, zomwe zingathandize bwino kulimbitsa mphamvu yogwirizana komanso kukana kwa matope.
Zinthu monga kutentha kwa mpweya, kutentha ndi kuthamanga kwa mphepo zimakhudza kuchuluka kwa madzi omwe amasungunuka mu simenti ndi zinthu zopangidwa ndi gypsum. Chifukwa chake, m'nyengo zosiyanasiyana, pali kusiyana pakati pa momwe madzi amasungidwa ndi zinthu zomwe zimawonjezeredwa ndi hydroxypropyl methylcellulose.
Mu kapangidwe kake, mphamvu yosungira madzi ya slurry ikhoza kusinthidwa powonjezera kapena kuchepetsa kuchuluka kwa HPMC komwe kwawonjezeredwa. Kusunga madzi kwa methyl cellulose ether pansi pa kutentha kwakukulu ndi chizindikiro chofunikira chosiyanitsa mtundu wa methyl cellulose ether.
Zogulitsa zabwino kwambiri za hydroxypropyl methylcellulose zimatha kuthetsa vuto la kusunga madzi pansi pa kutentha kwambiri. Mu nyengo yotentha kwambiri, makamaka m'malo otentha ndi ouma komanso kapangidwe kopyapyala kumbali ya dzuwa, HPMC yapamwamba imafunika kuti madzi asungidwe bwino.
HPMC yapamwamba kwambiri ili ndi kufanana kwabwino kwambiri. Magulu ake a methoxy ndi hydroxypropoxy amagawidwa mofanana mu unyolo wa maselo a cellulose, zomwe zingathandize kuti maatomu a okosijeni omwe ali pa ma hydroxyl ndi ether agwirizane ndi madzi kuti apange ma hydrogen bond. , kotero kuti madzi omasuka amakhala omangika m'madzi, kuti azitha kuwongolera bwino kutuluka kwa madzi chifukwa cha kutentha kwambiri, ndikupangitsa kuti madzi azisungidwa bwino.
Madzi amafunika kuti zinthu zolimbitsa simenti zikhazikike bwino monga simenti ndi gypsum zikhale zonyowa. Kuchuluka koyenera kwa HPMC kumatha kusunga chinyezi mu matope kwa nthawi yayitali kuti njira yokhazikika ndi kuuma ipitirire.
Kuchuluka kwa HPMC komwe kumafunika kuti madzi asungidwe mokwanira kumadalira:
1. Kuyamwa kwa gawo loyambira
2. Kapangidwe ka matope
3. Kukhuthala kwa matope
4. Kufunika kwa madzi kwa matope
5. Nthawi yoika zinthu zoyeretsera
Hydroxypropyl methylcellulose yapamwamba kwambiri imatha kufalikira mofanana komanso moyenera mu simenti ndi zinthu zopangidwa ndi gypsum, ndikukulunga tinthu tonse tolimba, ndikupanga filimu yonyowetsa, ndipo chinyezi chomwe chili pansi chimatulutsidwa pang'onopang'ono kwa nthawi yayitali, komanso hydration reaction ndi zinthu zopanda organic gelling kuti zitsimikizire kuti zinthuzo zikugwirizana komanso kuti zinthuzo zizikhala zolimba.
Chifukwa chake, pomanga nthawi yotentha kwambiri yachilimwe, kuti madzi asungidwe bwino, ndikofunikira kuwonjezera zinthu zabwino kwambiri za HPMC mokwanira motsatira njira yopangira, apo ayi, sipadzakhala madzi okwanira, mphamvu yochepa, ming'alu, mabowo ndi kutayika kwa madzi chifukwa cha mavuto ouma kwambiri, komanso kuwonjezera zovuta zomangira. Pamene kutentha kukutsika, kuchuluka kwa madzi omwe HPMC imawonjezera kumatha kuchepetsedwa pang'onopang'ono, ndipo zotsatira zomwezo zosungira madzi zitha kupezeka.
Nthawi yotumizira: Januwale-16-2023