Hydroxypropyl methylcellulose (HPMC) ke ether e seng ionic cellulose e entsoeng ka selulose ea tlhaho ea polymer ka letoto la lits'ebetso tsa lik'hemik'hale. Ke phofo e tšoeu e sa nkheng, e sa latsoeheng le e se nang chefo, e kokomohang hore e be motsoako o hlakileng kapa o nang le maru hanyenyane metsing a batang. E na le ho teteana, ho tlama, ho qhalakanya, emulsifying, filimi-forming, suspending, adsorbing, gelling, surface active, ho boloka mongobo le ho sireletsa thepa ea colloid. Hydroxypropyl methyl cellulose le methyl cellulose li ka sebelisoa ho haha, indasteri ea pente, resin ea maiketsetso, indasteri ea ceramic, meriana, lijo, masela, temo, lik'hemik'hale tsa letsatsi le letsatsi le liindasteri tse ling.
Phello ea ho boloka metsi le molao-motheo oa hydroxypropyl methylcellulose HPMC
Cellulose ether HPMC haholo-holo e bapala karolo ea ho boloka metsi le ho tiea ka har'a seretse sa samente le seretse se thehiloeng ho gypsum, 'me e ka ntlafatsa ka katleho matla a momahaneng le khanyetso ea sag ea slurry.
Lintho tse kang mocheso oa moea, mocheso le lebelo la khatello ea moea li tla ama sekhahla sa ho fetoha ha metsi seretseng sa samente le lihlahisoa tse thehiloeng ho gypsum. Ka hona, ka linako tse fapaneng tsa selemo, ho na le liphapang tse mabapi le phello ea ho boloka metsi ea lihlahisoa tse nang le palo e lekanang ea HPMC e ekelitsoeng. Moahong o ikhethileng, phello ea ho boloka metsi ea slurry e ka fetoloa ka ho eketsa kapa ho fokotsa palo ea HPMC e kentsoeng. Ho boloka metsi a methyl cellulose ether tlas'a maemo a mocheso o phahameng ke pontšo ea bohlokoa ho khetholla boleng ba methyl cellulose ether. Lihlahisoa tse ntle ka ho fetisisa tsa HPMC li ka rarolla bothata ba ho boloka metsi tlas'a mocheso o phahameng. Linakong tsa mocheso o phahameng, haholo-holo libakeng tse chesang le tse omileng le kaho ea lera le tšesaane lehlakoreng le chabileng, HPMC ea boleng bo holimo ea hlokahala ho ntlafatsa ho boloka metsi a seretse. HPMC ea boleng bo holimo e na le ts'ebetso e ntle haholo. Lihlopha tsa eona tsa methoxy le hydroxypropoxy li ajoa ka ho lekana hammoho le ketane ea molek'hule ea cellulose, e ka ntlafatsang bokhoni ba liathomo tsa oksijene holim'a li-bond tsa hydroxyl le ether ho kopana le metsi ho etsa li-hydrogen bond. , e le hore metsi a sa lefelloeng e be metsi a tlamiloeng, e le hore a laole ka katleho mouoane oa metsi o bakoang ke mocheso o phahameng oa mocheso, le ho finyella ho boloka metsi a mangata.
HPMC ea boleng bo phahameng ea cellulose e ka qhalakanngoa ka mokhoa o ts'oanang le ka katleho ka seretse sa samente le lihlahisoa tse thehiloeng ho gypsum, 'me ea phuthela likaroloana tsohle tse tiileng,' me ea etsa filimi ea ho kolobisa, mongobo o botlaaseng o lokolloa butle-butle ka nako e telele, le sekhomaretsi sa inorganic. hydration karabelo ea lintho tse coagulated tla etsa bonnete ba tlamo matla le compressive matla a lintho tse bonahalang. Ka hona, mohahong o phahameng oa mocheso oa lehlabula, e le ho finyella phello ea ho boloka metsi, hoa hlokahala ho eketsa lihlahisoa tsa boleng bo phahameng ba HPMC ka bongata bo lekaneng ho ea ka foromo, ho seng joalo, ho tla ba le hydration e sa lekaneng, matla a fokotsehileng, ho phunyeha, ho pata. le ho tsholla ho bakoang ke ho omisa haholo. mathata, empa hape eketsa bothata ba kaho ea basebetsi. Ha mocheso o theoha, palo ea metsi a HPMC e ekelitsoeng e ka fokotsoa butle-butle, 'me phello e tšoanang ea ho boloka metsi e ka finyelloa.
Ho boloka metsi a hydroxypropyl methylcellulose HPMC sehlahisoa ka bosona hangata ho angoa ke lintlha tse latelang:
HPMC e sebetsang ka ho lekana, methoxyl le hydroxypropoxyl li ajoa ka ho lekana, 'me sekhahla sa ho boloka metsi se phahame;
Cellulose ether HPMC mocheso oa mocheso oa gel o phahame, sekhahla sa ho boloka metsi se phahame; ho seng joalo, tekanyo ea ho boloka metsi e tlaase;
Ha viscosity ea cellulose ether HPMC e eketseha, tekanyo ea ho boloka metsi e boetse e eketseha; ha viscosity e fihla boemong bo itseng, ho eketseha ha tekanyo ea ho boloka metsi ho atisa ho ba bonolo;
Ha palo e kholo ea cellulose ether HPMC e eketsoa, sekhahla sa ho boloka metsi se phahame le phello e ntle ea ho boloka metsi. Ho phaella ho 0.25-0.6%, tekanyo ea ho boloka metsi e eketseha ka potlako ka keketseho ea palo ea ho eketsa; ha palo ea tlatsetso e ntse e eketseha, mokhoa oa ho eketseha oa sekhahla sa ho boloka metsi oa fokotseha.
Nako ea poso: Jun-01-2023