Odakeni osulungile, inani elingeziwe le-hydroxypropyl methyl cellulose HPMC liphansi kakhulu, kodwa lingathuthukisa kakhulu ukusebenza kodaka olumanzi, okuyisengezo esikhulu esithinta ukusebenza kokwakhiwa kodaka. Ama-cellulose ether ane-viscosity ehlukene kanye nenani elingeziwe anomphumela omuhle ekuthuthukiseni ukusebenza kodaka olomile. Njengamanje, izinsimbi eziningi zamatshe kanye nezikhonkwane zinezakhiwo ezingezinhle zokugcina amanzi, futhi ukuhlukaniswa kodaka lwamanzi kwenzeka ngemva kwemizuzu embalwa yokuma unganyakazi. Ukugcinwa kwamanzi kuwumsebenzi obalulekile we-methyl cellulose ether, futhi kuwumsebenzi abakhiqizi abaningi basekhaya bodaka olomile, ikakhulukazi labo abasezindaweni ezinamazinga okushisa aphakeme eningizimu, abakunaka. Izici ezithinta umphumela wokugcina amanzi wodaka olomile zihlanganisa inani le-HPMC elingeziwe, i-viscosity ye-HPMC, ukucoleka kwezinhlayiya kanye nezinga lokushisa kwendawo esetshenziswa kuyo.
1. Umqondo: I-Cellulose ether iyi-polymer yamangqamuzana ephezulu yokwenziwa eyenziwe nge-cellulose yemvelo ngokuguqulwa kwamakhemikhali. I-Cellulose ether iphuma ku-cellulose yemvelo. Ukukhiqizwa kwe-cellulose ether kuhlukile kuma-polymers okwenziwa. Impahla yayo eyisisekelo i-cellulose, isakhi se-polymer yemvelo. Ngenxa yesakhiwo esikhethekile se-cellulose yemvelo, i-cellulose ngokwayo ayinalo ikhono lokusabela nge-etherifying agents. Kodwa ngemva kokwelashwa kwe-ejenti yokuvuvukala, izibopho eziqinile ze-hydrogen phakathi kwamaketanga amangqamuzana nangaphakathi kweketanga ziyabhujiswa, futhi ukukhululwa okusebenzayo kweqembu le-hydroxyl kuphenduka kube i-alkali cellulose esebenzayo. Ngemva kokusabela kwe-etherification, iqembu -OH liguqulelwa ku -OR iqembu. Thola i-cellulose ether. Imvelo ye-cellulose ether incike ohlotsheni, ubuningi nokusatshalaliswa kwezinto ezibambele. Ukuhlukaniswa kwe-cellulose ethers futhi kusekelwe ezinhlotsheni zama-substitute, izinga le-etherification, ukuncibilika kanye nezinhlelo zokusebenza ezihlobene. Ngokuya kohlobo lwama-substituent ochungechungeni lwemolekyuli, ingahlukaniswa ibe i-monoether ne-ether exutshiwe. I-HPMC esivame ukuyisebenzisa iyi-ether exubile. I-Hydroxypropyl methyl cellulose ether HPMC iwumkhiqizo lapho ingxenye yeqembu le-hydroxyl eyunithi ithathelwa indawo yiqembu le-methoxy futhi enye ingxenye ithathelwa indawo yiqembu le-hydroxypropyl. I-HPMC isetshenziswa kakhulu ezintweni zokwakha, okokugcotshwa kwe-latex, imithi, ikhemistri yansuku zonke, njll. Isetshenziswa njenge-thickener, i-ejenti egcina amanzi, i-stabilizer, i-dispersant, ne-ejenti yokwenza ifilimu.
2. Ukugcinwa kwamanzi kwe-cellulose ether: ekukhiqizeni izinto zokwakha, ikakhulukazi udaka olomile, i-cellulose ether idlala indima engenakushintshwa, ikakhulukazi ekukhiqizeni udaka olukhethekile (udaka oluguquliwe), lubalulekile. ingxenye. Iqhaza elibalulekile le-ether ye-cellulose encibilikayo emanzini odakeni ikakhulukazi lizici ezintathu. Enye iwumthamo omuhle kakhulu wokugcinwa kwamanzi, enye ithonya ekubambisaneni kanye ne-thixotropy yodaka, kanti okwesithathu ukuxhumana nosimende. Umthelela wokugcina amanzi we-cellulose ether uncike ekumunceni kwamanzi kwesendlalelo sesisekelo, ukwakheka kodaka, ukujiya koqweqwe lodaka, isidingo samanzi sodaka, kanye nesikhathi sokusetha sento ehlanganayo. Ukugcinwa kwamanzi kwe-cellulose ether ngokwayo kuvela ekuncibilikeni nasekuphelelweni kwamanzi emzimbeni kwe-cellulose ether ngokwayo.
ukuqina kanye ne-thixotropy ye-cellulose ether: Indima yesibili ye-cellulose ether-thickening incike: izinga le-polymerization ye-cellulose ether, ukuhlushwa kwesisombululo, izinga lokushisa nezinye izimo. Izakhiwo ze-gelation zesisombululo ziyizakhiwo eziyingqayizivele ze-alkyl cellulose kanye nokuphuma kwayo okuguquliwe. Izici ze-Gelation zihlobene nezinga lokufaka esikhundleni, ukugxila kwesisombululo kanye nezithasiselo.
Umthamo omuhle wokugcina amanzi wenza i-hydration ye-cement iphelele kakhulu, ingathuthukisa i-tackiness emanzi yodaka olumanzi, ikhulise amandla okubopha odaka, futhi isikhathi singalungiswa. Ukwengezwa kwe-cellulose ether kudaka lokufafaza lomshini kungathuthukisa ukusebenza kokufuthwa noma ukumpompa kodaka, kanye namandla esakhiwo. Ngakho-ke, i-cellulose ether isetshenziswa kabanzi njengesengezo esibalulekile odakeni oluxubile.
Isikhathi sokuthumela: Dec-16-2021