Mu matope osakaniza bwino, kuchuluka kwa hydroxypropyl methyl cellulose HPMC komwe kumawonjezeredwa ndi kochepa kwambiri, koma kumatha kusintha kwambiri magwiridwe antchito a matope onyowa, omwe ndi chowonjezera chachikulu chomwe chimakhudza magwiridwe antchito a matope omangira. Ma ether a cellulose okhala ndi kukhuthala kosiyanasiyana komanso kuchuluka kowonjezera amakhala ndi zotsatira zabwino pakuwongolera magwiridwe antchito a matope ouma. Pakadali pano, matope ambiri omangira ndi opaka pulasitala ali ndi mphamvu zosasunga madzi, ndipo kulekanitsidwa kwa slurry kumachitika patatha mphindi zochepa atayima. Kusunga madzi ndi ntchito yofunika kwambiri ya methyl cellulose ether, ndipo ndi ntchito yomwe opanga matope ouma ambiri am'nyumba, makamaka omwe ali m'malo otentha kwambiri kum'mwera, amalabadira. Zinthu zomwe zimakhudza momwe matope ouma amasungira madzi ndi monga kuchuluka kwa HPMC yowonjezera, kukhuthala kwa HPMC, kusalala kwa tinthu tating'onoting'ono ndi kutentha kwa malo omwe amagwiritsidwa ntchito.
1. Lingaliro: Cellulose ether ndi polima yopangidwa ndi maselo ambiri yopangidwa kuchokera ku cellulose yachilengedwe kudzera mu kusintha kwa mankhwala. Cellulose ether ndi yochokera ku cellulose yachilengedwe. Kupanga kwa cellulose ether ndikosiyana ndi ma polima opangidwa. Zinthu zake zofunika kwambiri ndi cellulose, mankhwala achilengedwe a polymer. Chifukwa cha kapangidwe kake kapadera ka cellulose yachilengedwe, cellulose yokha ilibe mphamvu yochitapo kanthu ndi zinthu zotenthetsera. Koma pambuyo poti mankhwala otupa athandizidwa, ma hydrogen bonds amphamvu pakati pa unyolo wa mamolekyu ndi mkati mwa unyolo amawonongeka, ndipo kutulutsidwa kwa gulu la hydroxyl kumasanduka reactive alkali cellulose. Pambuyo poti mankhwala otenthetsera achitapo kanthu, gulu la -OH limasinthidwa kukhala gulu la -OR. Pezani cellulose ether. Mtundu wa cellulose ether umadalira mtundu, kuchuluka ndi kufalikira kwa zinthu zolowetsera. Kugawa kwa ma cellulose ethers kumadaliranso mitundu ya zinthu zolowetsera, kuchuluka kwa etherification, kusungunuka ndi ntchito zina. Malinga ndi mtundu wa zinthu zolowetsera pa unyolo wa mamolekyu, zitha kugawidwa m'magulu awiri: monoether ndi mixed ether. HPMC yomwe timagwiritsa ntchito nthawi zambiri ndi ether yosakanikirana. Hydroxypropyl methyl cellulose ether HPMC ndi chinthu chomwe gawo la gulu la hydroxyl pa unit limasinthidwa ndi gulu la methoxy ndipo gawo lina limasinthidwa ndi gulu la hydroxypropyl. HPMC imagwiritsidwa ntchito kwambiri pazipangizo zomangira, zokutira za latex, mankhwala, mankhwala a tsiku ndi tsiku, ndi zina zotero. Imagwiritsidwa ntchito ngati chokhuthala, chosunga madzi, chokhazikika, chosungunula, komanso chopangira filimu.
2. Kusunga madzi kwa ether ya cellulose: popanga zipangizo zomangira, makamaka matope ouma, ether ya cellulose imagwira ntchito yosasinthika, makamaka popanga matope apadera (matope osinthidwa), ndi gawo lofunika kwambiri. Udindo wofunikira wa ether ya cellulose yosungunuka m'madzi mu matope uli makamaka m'mbali zitatu. Choyamba ndi mphamvu yabwino yosunga madzi, china ndi mphamvu pa kukhazikika ndi thixotropy ya matope, ndipo chachitatu ndi kuyanjana ndi simenti. Mphamvu yosunga madzi ya ether ya cellulose imadalira kuyamwa kwa madzi kwa maziko, kapangidwe ka matope, makulidwe a matope, kufunika kwa madzi kwa matope, ndi nthawi yoyika zinthu zomatira. Kusunga madzi kwa ether ya cellulose yokha kumachokera ku kusungunuka ndi kuchepa kwa madzi kwa ether ya cellulose yokha.
Kukhuthala ndi thixotropy ya cellulose ether: Udindo wachiwiri wa cellulose ether-thickening umadalira: kuchuluka kwa polymerization ya cellulose ether, kuchuluka kwa yankho, kutentha ndi zina. Makhalidwe a gelation a yankho ndi apadera a alkyl cellulose ndi zotumphukira zake zosinthidwa. Makhalidwe a gelation amagwirizana ndi kuchuluka kwa kusintha, kuchuluka kwa yankho ndi zowonjezera.
Kuchuluka kwa madzi komwe kumasunga bwino madzi kumapangitsa kuti simenti ikhale yokwanira, kungathandize kuti matope onyowa asanyowe, kuwonjezera mphamvu yolumikizirana ya matope, ndipo nthawi ikhoza kusinthidwa. Kuwonjezera kwa ether ya cellulose ku matope opopera makina kungathandize kuti matopewo azitha kupopera kapena kupopera, komanso mphamvu ya kapangidwe kake. Chifukwa chake, ether ya cellulose ikugwiritsidwa ntchito kwambiri ngati chowonjezera chofunikira mu matope osakaniza okonzeka.
Nthawi yotumizira: Disembala-16-2021