Karolo le molao-motheo oa ho boloka metsi a hydroxypropyl methylcellulose HPMC

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 oa 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 methylcellulose le methylcellulose li ka sebelisoa ka thepa ea mohaho, indasteri ea pente, resin ea maiketsetso, indasteri ea ceramic, meriana, lijo, masela, temo, lik'hemik'hale tsa letsatsi le letsatsi le liindasteri tse ling.

Hydroxypropyl methylcellulose HPMC chemical equation:
[C6H7O2(OH)3-mn(OCH3)m(OCH2CH(OH)CH3)n]x

Phello ea ho boloka metsi le molao-motheo oa hydroxypropyl methylcellulose HPMC:
Cellulose ether HPMChaholo-holo e bapala karolo ea ho boloka metsi le ho teteana ka seretse sa samente le seretse se thehiloeng ho gypsum, 'me se ka ntlafatsa ka katleho matla a momahaneng le ho hanyetsa ho senyeha ha 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 methoxyl le hydroxypropoxyl li ajoa ka ho lekana hammoho le ketane ea molek'hule ea cellulose, e ka ntlafatsang bokhoni ba liathomo tsa oksijene ho li-bond tsa hydroxyl le ether ho hokahana 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:

1. Ho tšoana ha cellulose ether HPMC
HPMC e sebetsang ka ho lekana, methoxyl le hydroxypropoxyl li ajoa ka ho lekana, 'me sekhahla sa ho boloka metsi se holimo.

2. Cellulose ether HPMC mocheso oa mocheso oa gel
Ha mocheso oa gel o futhumatsang o phahame, sekhahla sa ho boloka metsi se phahame; ho seng joalo, sekhahla sa ho boloka metsi se ka tlase.

3. Cellulose Ether HPMC Viscosity
Ha viscosity ea 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.

4. Keketso ea palo ea cellulose ether HPMC
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.