Dzina la HPMC la Chitchaina ndi hydroxypropyl methylcellulose. Si ionic ndipo nthawi zambiri imagwiritsidwa ntchito ngati chosungira madzi mu matope osakanikirana ndi madzi. Ndi chinthu chosungira madzi chomwe chimagwiritsidwa ntchito kwambiri mu matope.
Njira yopangira HPMC makamaka ndi chinthu cha polysaccharide chopangidwa ndi ether chomwe chimapangidwa ndi alkalization ndi etherification ya thonje (yopangidwa ndi anthu). Sichikhala ndi mphamvu yokha, sichichita ndi ma ayoni omwe ali mu gelling, ndipo chimagwira ntchito bwino. Mtengo wake ndi wotsika kuposa mitundu ina ya ma cellulose ether, kotero chimagwiritsidwa ntchito kwambiri mu matope osakanikirana ndi madzi.
Ntchito ya hydroxypropyl methylcellulose: Imatha kukhuthala matope osakaniza kumene kuti akhale ndi kukhuthala konyowa komanso kupewa kupatukana. (Kukhuthala) Kusunga madzi ndi chinthu chofunikira kwambiri, chomwe chimathandiza kusunga madzi omasuka mumatope, kotero kuti matopewo akapangidwa, zinthu zomangira simenti zimakhala ndi nthawi yochulukirapo yothira madzi. (Kusunga madzi) Ili ndi mphamvu zolowetsa mpweya, zomwe zimatha kuyambitsa thovu la mpweya lofanana komanso laling'ono kuti liwongolere kapangidwe ka matopewo.
Kukhuthala kwa hydroxypropyl methylcellulose ether kukakwera, kumakhala bwino kwambiri pakusunga madzi. Kukhuthala ndi chinthu chofunikira kwambiri pakugwira ntchito kwa HPMC. Pakadali pano, opanga osiyanasiyana a HPMC amagwiritsa ntchito njira ndi zida zosiyanasiyana poyesa kukhuthala kwa HPMC. Njira zazikulu ndi HaakeRotovisko, Hoppler, Ubbelohde ndi Brookfield.
Pa chinthu chomwecho, zotsatira za kukhuthala zomwe zimayesedwa ndi njira zosiyanasiyana zimakhala zosiyana kwambiri, ndipo zina zimakhala ndi kusiyana kawiri. Chifukwa chake, poyerekeza kukhuthala, ziyenera kuchitika pakati pa njira zomwezo zoyesera, kuphatikizapo kutentha, rotor, ndi zina zotero. Ponena za kukula kwa tinthu, tinthu tating'onoting'ono tikakhala tating'onoting'ono, tinthu tating'onoting'ono timakhala bwino, ndipo kusunga madzi kumakhala bwino. Tinthu tating'onoting'ono ta cellulose ether tikakumana ndi madzi, pamwamba pake nthawi yomweyo timasungunuka ndikupanga gel yokulunga zinthuzo kuti mamolekyu amadzi asapitirire kulowa. Nthawi zina sizingafalitsidwe mofanana ndikusungunuka ngakhale mutasakaniza kwa nthawi yayitali, ndikupanga yankho la mitambo kapena agglomeration. Zimakhudza kwambiri kusunga madzi kwa cellulose ether, ndipo kusungunuka ndi chimodzi mwazinthu zomwe zimasankha cellulose ether.
Kusalala ndi chizindikiro chofunikira cha ntchito ya methyl cellulose ether. MC yomwe imagwiritsidwa ntchito pa matope ouma amafunika kukhala ufa, wokhala ndi madzi ochepa, ndipo kusalala kwake kumafunanso 20% ~ 60% ya kukula kwa tinthu kuti ikhale yochepera 63um. Kusalala kumeneku kumakhudza kusungunuka kwa hydroxypropyl methylcellulose ether. MC yolimba nthawi zambiri imakhala ndi tinthu tating'onoting'ono, ndipo imakhala yosavuta kusungunuka m'madzi popanda kusonkhana, koma kuchuluka kwa kusungunuka kumakhala kochedwa kwambiri, kotero sikoyenera kugwiritsidwa ntchito mu matope ouma.
Mu matope ouma, MC imafalikira pakati pa zinthu zopangira simenti monga aggregate, filler yabwino ndi simenti, ndipo ufa wokwanira wokha ndi womwe ungapewe methyl cellulose ether agglomeration ikasakanikirana ndi madzi. MC ikawonjezedwa ndi madzi kuti isungunuke ma agglomerate, zimakhala zovuta kwambiri kufalitsa ndi kusungunula. Kusalala kwa MC sikuti kungowononga chabe, komanso kumachepetsa mphamvu ya matope. Mukagwiritsa ntchito matope ouma otere pamalo akuluakulu, liwiro lochira la matope ouma a m'deralo lidzachepa kwambiri, ndipo ming'alu idzawonekera chifukwa cha nthawi zosiyanasiyana zochiritsira. Pa matope opopera ndi kapangidwe ka makina, kufunikira kwa kusalala kumakhala kwakukulu chifukwa cha nthawi yochepa yosakaniza. Kawirikawiri, kukhuthala kwakukulu, kumakhala bwino pakusunga madzi. Komabe, kukhuthala kwakukulu komanso kulemera kwa molekyulu ya MC, kuchepa kofanana kwa kusungunuka kwake kudzakhala ndi zotsatira zoyipa pa mphamvu ndi magwiridwe antchito a matope.
Kukhuthala kwakukulu, kukhuthala kwa matope kumaonekera bwino, koma sikufanana mwachindunji. Kukhuthala kwakukulu, kukhuthala kwa matope onyowa kumakhala kolimba kwambiri, ndiko kuti, panthawi yomanga, kumaonekera ngati kumamatira ku chotsukira ndi kumamatira kwambiri ku substrate. Koma sizothandiza kuwonjezera mphamvu ya kapangidwe ka matope onyowa okha. Izi zikutanthauza kuti, panthawi yomanga, mphamvu yotsutsana ndi kusagwa siionekera bwino. M'malo mwake, ma ether ena apakatikati ndi otsika koma osinthidwa a methyl cellulose ali ndi magwiridwe antchito abwino kwambiri pakukweza mphamvu ya kapangidwe ka matope onyowa.
Kusunga madzi kwa HPMC kumagwirizananso ndi kutentha komwe kumagwiritsidwa ntchito, ndipo kusunga madzi kwa methyl cellulose ether kumachepa ndi kuwonjezeka kwa kutentha. Komabe, pakugwiritsa ntchito zinthu zenizeni, matope ouma nthawi zambiri amagwiritsidwa ntchito pazigawo zotentha pa kutentha kwambiri (koposa madigiri 40) m'malo ambiri, monga kuyika pulasitala padenga lakunja pansi pa dzuwa nthawi yachilimwe, zomwe nthawi zambiri zimathandizira Kukonza simenti ndi kuuma kwa matope ouma. Kutsika kwa kuchuluka kwa kusunga madzi kumabweretsa kumverera koonekeratu kuti kukana kugwira ntchito komanso kukana ming'alu kumakhudzidwa, ndipo ndikofunikira kwambiri kuchepetsa mphamvu ya zinthu zotentha pansi pa vutoli.
Pachifukwa ichi, zowonjezera za methyl hydroxyethyl cellulose ether pakadali pano zimaonedwa kuti ndizotsogola pakukula kwaukadaulo. Ngakhale kuchuluka kwa methyl hydroxyethyl cellulose kukuwonjezeka (njira yachilimwe), kulimba kwa ntchito ndi kukana ming'alu sikungathe kukwaniritsa zosowa zogwiritsidwa ntchito. Kudzera mu chithandizo chapadera pa MC, monga kuwonjezera kuchuluka kwa etherification, ndi zina zotero, mphamvu yosungira madzi imatha kusungidwa kutentha kwambiri, kuti ipereke magwiridwe antchito abwino pansi pa mikhalidwe yovuta.
Mlingo wa HPMC suyenera kukhala wokwera kwambiri, apo ayi udzawonjezera kufunikira kwa madzi mu matope, udzagwirana ndi trowel, ndipo nthawi yoyika idzakhala yayitali kwambiri, zomwe zidzakhudza kupangika kwake. Zinthu zosiyanasiyana za matope zimagwiritsa ntchito HPMC yokhala ndi kukhuthala kosiyanasiyana, ndipo sizigwiritsa ntchito HPMC yokhala ndi kukhuthala kwakukulu mwachisawawa. Chifukwa chake, ngakhale kuti zinthu za hydroxypropyl methylcellulose ndi zabwino, zimayamikiridwa zikagwiritsidwa ntchito bwino. Kusankha HPMC yoyenera ndiye udindo waukulu wa ogwira ntchito m'ma laboratories. Pakadali pano, ogulitsa ambiri osakhulupirika akuwonjezera HPMC, ndipo khalidwe lake ndi loipa kwambiri. Posankha cellulose inayake, labotale iyenera kuchita bwino poyesa kuti iwonetsetse kuti matopewo ndi olimba, ndipo musakhale adyera pamtengo wotsika ndikupangitsa kuti zinthuzo zitayike mosayenera.
Nthawi yotumizira: Meyi-04-2023