Hydroxypropyl Methylcellulose (HPMC) ke ether e seng ea ionic cellulose e sebelisoang haholo ho thepa ea mohaho, haholo-holo liretseng tse omeletseng, li-adhesives le liphahlo. Viscosity ea HPMC ke e 'ngoe ea lipontšo tsa eona tsa bohlokoa tsa ts'ebetso lits'ebetsong tsa kaho mme e na le tšusumetso ea bohlokoa ho sebetsa, ho boloka metsi le thepa ea mochini.
Kamano lipakeng tsa viscosity ea hydroxypropyl methylcellulose le thepa ea foromo
Ho khona ho sebetsa
The viscosity ea HPMC e phetha karolo ea bohlokoa ho sebetsa ha thepa ea mohaho. High viscosity HPMC ka haholo ntlafatsa ho tsitsang le rheological thepa ea lintho tse bonahalang, e lumella hore e be molemo ho khomarela substrate le ho fokotsa sagging nakong kaho. Ka mohlala, ka li-adhesive tsa lithaele tsa ceramic, tšebeliso ea HPMC e nang le viscosity e phahameng e ka etsa hore ho be bonolo hore sekhomaretsi se thehe seaparo se lekanang pakeng tsa lithaele tsa ceramic le substrate, ka tsela eo ho ntlafatsa katleho ea kaho le boleng ba tlamahano.
Leha ho le joalo, viscosity e phahameng haholo e ka etsa hore ts'ebeliso e be thata le ho feta, kaha lisebelisoa tse nang le viscosity e phahameng li ka ba thata ho hlohlelletsa le ho hasana. Ka hona, hoa hlokahala ho fumana tekano lipakeng tsa viscosity le ts'ebetso ho netefatsa hore thepa e na le ts'ebetso e ntle mme e ka fihlela litlhoko tsa boenjiniere.
Ho boloka metsi
Thepa ea ho boloka metsi ea HPMC e bohlokoa molemong oa ho thatafatsa thepa ea moaho. High viscosity HPMC e na le matla a ho boloka metsi a matla 'me e khona ho boloka mongobo ka thepa nako e telele ka mor'a ho hahoa. Sena ke sa bohlokoa ka ho khetheha bakeng sa lisebelisoa tse thehiloeng ho samente, hobane mongobo o lekaneng o ka khothalletsa karabelo ea hydration ea samente le ho ntlafatsa matla le ho tšoarella ha thepa e thata.
Ka thepa e thehiloeng ho gypsum, HPMC e phahameng ea viscosity e boetse e thusa ho thibela tahlehelo e feteletseng ea mongobo nakong ea kaho, ka hona ho qoba mathata le mathata a ho fokotseha. Ka kakaretso, HPMC e nang le viscosity e phahameng e na le melemo e totobetseng ea ho ntlafatsa ho boloka metsi 'me e loketse lits'ebetso tse hlokang taolo e phahameng ea mongobo.
Anti-sag le anti-slip properties
Ka thepa ea ho roala leboteng le likhomaretsi tsa lithaele, viscosity ea HPMC le eona e na le tšusumetso e kholo ho hanyetsang sag le ho hanyetsa ho thella. HPMC e phahameng ea viscosity e ka eketsa thixotropy ea thepa ka katleho, ea etsa hore e bontše viscosity e phahameng ka boemo bo tsitsitseng, kahoo e fokotsa ho phalla ha thepa holim'a libaka tse emeng. Thepa ena ke ea bohlokoa bakeng sa ho boloka botsitso ba liphahlo kapa lithaele holim'a libaka tse otlolohileng, ho thusa ho ntlafatsa boleng le katleho ea kaho.
Air encapsulation le matla a tlamo
Viscosity ea HPMC e boetse e ama palo ea moea o kenang ka har'a thepa le matla a eona a ho qetela. High-viscosity HPMC e ka eketsa litaba tsa moea ka har'a thepa, ka tsela eo e ntlafatsa botsitso ba molumo oa thepa le thepa ea ho kenya mocheso. Leha ho le joalo, moea o phahameng haholo o ka fokotsa ho teteana ha thepa, ka hona ho ama matla a eona a tlamo. Ka hona, ha u khetha HPMC, hoa hlokahala ho nahana ka botlalo ka phello ea viscosity ea eona ho thepa ea sebopeho sa thepa ho netefatsa hore thepa e na le ts'ebetso e ntle ea ts'ebetso mme e ka fihlela litlhoko tsa ho qetela tsa ts'ebetso ea mochini.
Ntlafatso le khetho lits'ebetsong tse sebetsang
Lits'ebetsong tse sebetsang, baetsi ba thepa ea moaho hangata ba ntlafatsa palo ea ts'ebeliso le viscosity ea HPMC ka liteko le boiphihlelo ho fihlela litlhoko tsa lits'ebetso tse ikhethileng. Haholo-holo, maemo a fapaneng a ts'ebeliso a ka ba le litlhoko tse fapaneng bakeng sa viscosity ea HPMC. Mohlala, ka har'a likhomaretsi tsa lithaele, HPMC e nang le viscosity e phahameng hangata e sebelisoa ho matlafatsa khanyetso ea ho thella, ha seretse sa plastering, HPMC e nang le viscosity e mahareng e ka khethoa ho ela hloko ts'ebetso le ho boloka metsi.
Liparamente tse kang kabo ea boima ba limolek'hule, degree of substitution (DS) le molar degree of substitution (MS) ea HPMC le tsona li tla ama viscosity le ts'ebetso ea eona. Ka hona, ha u khetha HPMC, ha ho na viscosity feela e lokelang ho nahanoa, empa lisebelisoa tse ling tsa lik'hemik'hale le tsona li tlameha ho nahanoa ka botlalo ho netefatsa ts'ebetso ea eona e nepahetseng ea thepa ea moaho.
Viscosity ea hydroxypropyl methylcellulose e na le phello e kholo ts'ebetsong ea eona ho thepa ea mohaho. Ka ho khetha le ho ntlafatsa viscosity ea HPMC, ts'ebetso ea thepa, ho boloka metsi, ho hanyetsa le ho thibela moea ho ka ntlafatsoa, ka hona ho ntlafatsa ts'ebetso ea kakaretso le katleho ea kaho ea thepa ea mohaho. Lits'ebetsong tse sebetsang, HPMC e nang le viscosity e nepahetseng e hloka ho khethoa ho latela litlhoko tse khethehileng tsa thepa le maemo a kaho ho fihlela phello e ntle ea kaho le ho tšoarella. Sena ha se hloke feela kutloisiso e tebileng ea thepa ea lik'hemik'hale le ea 'mele ea HPMC, empa hape e hloka motsoako oa boiphihlelo le lintlha tsa tlhahlobo ts'ebetsong ea 'nete ho netefatsa ts'ebetso e felletseng ea ts'ebetso ea lisebelisoa.
Nako ea poso: Jul-10-2024