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. Chopangidwa ndi ether chochokera ku polysaccharide chomwe chimapangidwa ndi alkalization ndi etherification. Sichili ndi mphamvu yokha, sichimachita ndi ma ion 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. 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 zoyesera zomwezo, kuphatikizapo kutentha, rotor, ndi zina zotero.
Ponena za kukula kwa tinthu tating'onoting'ono, tinthu tating'onoting'ono tikakhala tochepa, timasunga bwino madzi. Tinthu tating'onoting'ono ta cellulose ether tikakumana ndi madzi, pamwamba pake timasungunuka nthawi yomweyo 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 zimasankhidwa posankha cellulose ether. Kusalala ndi chizindikiro chofunikira cha 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 kumakhudza kusungunuka kwa hydroxypropyl methylcellulose ether. MC yolimba nthawi zambiri imakhala ndi granular, ndipo ndi yosavuta kusungunuka m'madzi popanda agglomeration, koma kuchuluka kwa kusungunuka kumakhala kochedwa kwambiri, kotero sikoyenera kugwiritsidwa ntchito mu matope ouma. Mu matope ouma, MC imafalikira pakati pa zinthu zomangira simenti monga aggregate, filler fine ndi simenti, ndipo ufa wokwanira wokha ndi womwe ungapewe methyl cellulose ether agglomeration ikasakanikirana ndi madzi.
Kawirikawiri, kukhuthala kwa madzi kukakhala kwakukulu, kumakhala bwino kwambiri. Komabe, kukhuthala kwa madzi kukakhala kwakukulu komanso kulemera kwa molekyulu ya MC, kuchepa kofanana kwa kusungunuka kwake kudzakhala ndi zotsatira zoyipa pa mphamvu ndi magwiridwe antchito a matope. Kukhuthala kwa madzi kukakhala kwakukulu, kukhuthala kwa matope kumakhala koonekera bwino, koma sikufanana mwachindunji. Kukhuthala kwa madzi kukakhala kwakukulu, kukhuthala kwa matope onyowa kumakhala kolimba kwambiri, ndiko kuti, panthawi yomanga, kumaonekera ngati kumamatira ku scraper ndi kumamatira kwambiri ku substrate. Koma sizothandiza kuwonjezera mphamvu ya matope onyowa okha. Ndiko kuti, panthawi yomanga, mphamvu yotsutsana ndi kusagwa siidziwika. M'malo mwake, ma ether ena apakatikati ndi otsika koma osinthidwa a methyl cellulose ali ndi magwiridwe antchito abwino kwambiri pakukweza mphamvu ya 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, pogwiritsira ntchito zinthu zenizeni, matope ouma nthawi zambiri amagwiritsidwa ntchito pazigawo zotentha pa kutentha kwambiri (koposa madigiri 40) m'malo ambiri, monga kuyika pulasitala pa khoma lakunja pansi pa dzuwa nthawi yachilimwe, zomwe nthawi zambiri zimathandizira Kukonza simenti ndi kuuma kwa matope ouma. Kutsika kwa kuchuluka kwa madzi osungira 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 zili patsogolo pa chitukuko cha ukadaulo. Ngakhale kuchuluka kwa methyl hydroxyethyl cellulose kumawonjezeka (njira yachilimwe), kukana kugwira ntchito ndi kukana ming'alu sikungakwaniritse zosowa zogwiritsidwa ntchito. Kudzera mu chithandizo chapadera pa MC, monga kuwonjezera kuchuluka kwa etherification, ndi zina zotero, mphamvu yosunga madzi imatha kusungidwa pa kutentha kwakukulu, kuti ipereke magwiridwe antchito abwino pansi pa mikhalidwe yovuta.
Kawirikawiri, HPMC ili ndi kutentha kwa gel, komwe kungagawidwe m'mitundu 60, mitundu 65, ndi mitundu 75. Kwa makampani omwe amagwiritsa ntchito mchenga wamtsinje pa matope wamba osakaniza bwino, ndi bwino kugwiritsa ntchito HPMC yamtundu wa 75 yokhala ndi kutentha kwakukulu kwa gel. Mlingo wa HPMC suyenera kukhala wokwera kwambiri, apo ayi udzawonjezera kufunikira kwa madzi a matope, udzamamatira ku trowel, ndipo nthawi yoyika idzakhala yayitali kwambiri, zomwe zidzakhudza kupangika. 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.
Nthawi yotumizira: Epulo-12-2023