Hydroxypropyl methylcelluloseke ether ea cellulose e hlahang ka tlhaho, e seng kotsi 'meleng oa motho. Leha ho le joalo, thepa e tala ea linter tsa k'hothone le HPMC tse sebelisoang fekthering kaofela lia khahla, hobane sena se tla ba le phello ea lerōle, 'me tse ling ha li kotsi.
Hydroxypropyl methylcellulose ha e na chefo. Cellulose e nkoa e loketse 'me e sebetsoa ka ho sebelisa likhoele tse hlahang ka tlhaho ka ho kopanya alkali, ho kopanya, ho hlatsoa, ho omisa, ho sila le mekhoa e meng. E ke ke ea beha bophelo ba batho kotsing.
Hydroxypropyl methyl cellulose, e tsejoang hape e le hypromellose le cellulose hydroxypropyl methyl ether, e etsoa ka ho sebelisa cellulose ea k'hothone e hloekileng haholo e le thepa e tala le ho feta etherification e khethehileng tlas'a maemo a alkaline.
Ho kopanngoa ha hydroxypropyl methylcellulose: cellulose ea k'hothone e hloekisitsoeng e phekoloa ka lye ho 35-40℃ ka halofo ea hora, e hatelloa, cellulose ea silafala, 'me botsofali bo etsoa ho 35℃ ho etsa hore faeba ea alkali e fumanoeng e be polymer ka ho lekana. Ka har'a sebaka se hlokahalang. Kenya faeba ea alkali ka ketleleng ea etherification, eketsa propylene oxide le methyl chloride ka tatellano, 'me u etherify ho 50-80℃ ka lihora tse 5, 'me khatello e kaholimo e ka ba 1.8MPa. Ebe u eketsa bongata bo loketseng ba hydrochloric acid le oxalic acid ho hlatsoa thepa ka metsi a chesang ho 90°C ho eketsa boholo le bophahamo. E ntše metsi ka ho e centrifugation. E hlatsoe ho fihlela e sa nke lehlakore. Ha metsi a ka har'a thepa a le ka tlase ho 60%, e omise ka molapo oa moea o chesang ho 130°C ho fihlela e le ka tlase ho 5%.
HPMC e hlahisoang ke mokhoa oa ho qhibiliha e sebelisa toluene le isopropanol e le tharollo. Haeba e hlatsuoa hampe haholo, e tla ba le monko o setseng hanyane. Ena ke bothata ba mokhoa oa ho hlatsoa, o sa ameng ts'ebeliso kapa bothata bofe kapa bofe.
Hypromellose ke k'hothone e hloekisitsoeng eo hangata e kenngwang ka mokelikeli ho fumana alkaline cellulose, ebe e nka karolo ho di-solvents, e leng di-etherification agents, toluene le isopropanol bakeng sa di-etherification reactions, mme e a tiiswa, e hlatsuwa, e omiswa, mme e silwa ho fumana dihlahiswa tse fedisitsweng. E mpe haholo ebile e nkga, kahoo basebedisi ba ka e sebedisa ba le boemong bo tsitsitseng.
Hydroxypropyl methylcellulose e lokela ho ela hloko lintho tse latelang tse sebelisitsoeng:
Ka phello ea phofo ea seretse, hydroxypropyl methylcellulose e bapala karolo e tšehetsang feela, 'me ha e kenelle karabelong efe kapa efe ea lik'hemik'hale. Phofo ea seretse e eketsoa ka metsi ebe e beoa leboteng, e leng karabelo ea lik'hemik'hale. Ka lebaka la ho thehoa ha lintho tse ncha, phofo ea seretse leboteng e tlosoa leboteng 'me e siloa hore e be phofo ho etsa lintho tse ncha. Hydroxypropyl methylcellulose e boloka metsi feela 'me e thusa calcium e putsoa ho ba le karabelo e betere, empa ha e kenelle karabelong efe kapa efe.
Hydroxypropyl Methyl Cellulose HPMC ha e kenelle karabelong efe kapa efe ea lik'hemik'hale, empa e thusa feela. Kenya metsi phofong ea seretse 'me u e behe leboteng, ke karabelo ea lik'hemik'hale. Ka lebaka la ho thehoa ha lintho tse ncha, phofo ea seretse leboteng e tlosoa leboteng 'me e siloa hore e be phofo, ebe ha ho khonehe, hobane lintho tse ncha li se li entsoe NS. Likarolo tse ka sehloohong tsa phofo ea calcium e putsoa ke: Ca(OH)2, motsoako oa CaO le CaCO3 e nyane, CaO3
H2O=Ca（OH）2-Ca（OH）2 CO2=CaCO3↓ H2O
Khalsiamo e putsoa e hlahisa lintho tse ling tlas'a tšusumetso ea metsi le CO2 moeeng, ha HPMC e boloka metsi feela 'me e thusa khalsiamo e putsoa ho ba le karabelo e betere. Ha e kenye letsoho karabelong efe kapa efe.
Hydroxypropyl methyl cellulose e na le mefuta e mengata ea ts'ebeliso. Bophelong ba letsatsi le letsatsi, lihlahisoa tse ngata ha li aroloe le ts'ebetso ea tlhahiso. Ebe, liindastering tse fapaneng, phello ea hydroxypropyl methylcellulose ke efe, ke tla u hlalosetsa eona, e le hore u ka thibela tšebeliso e mpe ea eona ha u ntse u fumana tsebo.
Sa pele, indastering ea kaho, e ka nkoa e le sesebelisoa sa ho thibela le ho boloka metsi. Seretse sa seretse se ka pompeloa, kahoo seretse sohle se omileng seo re se sebelisang se na le seabo sa sona. Ho phaella moo, linthong tsa kaho tse kang gypsum e tala, plaster le phofo ea seretse, se ka sebelisoa e le sehokelo, se sa atiseng nako ea ts'ebetso feela, empa hape se etsa hore pente e be bonolo ho e tlotsa. Lithaeleng tsa 'mabole, lithaele tsa ceramic tse khomarelang, mekhabiso ea polasetiki e kopaneng ea limolek'hule, e ka sebelisoa e le sesebelisoa sa ho matlafatsa ho khomarela, jj. Ho ka thoe hydroxypropyl methyl cellulose ke eona e tsebahalang haholo ka ho tenyetseha ha eona linthong tsa kaho.
Liindastering tse ling, tse kang tlhahiso ea porcelain le lipitsa tsa letsopa, e ka sebelisoa e le sekhomaretsi bakeng sa tlhahiso ea lihlahisoa tsa porcelain le lipitsa tsa letsopa; indastering ea lacquer le khatisong ea enke, e ka sebelisoa e le phofo e hlephileng, e thickener, e stabilizer, esita le hobane e ka kopanngoa le Solvent ea tlhaho kapa metsoako ea metsi hantle, 'me e ka sebelisoa e le sesebelisoa sa ho tlosa pente tlhahisong ea polasetiki ea metsoako ea limolek'hule, hammoho le li-softeners, li-mold release agents, li-lubricants, jj.; tlhahisong ea polyvinyl chloride, e nkoa e le phofo e hlephileng.
Lihlahisoa tse entsoeng ka hydroxypropyl methylcellulose li sebelisoa haholo bakeng sa litholoana le meroho, meriana, matlalo a liphoofolo le liindasteri tsa masela. E bolokehile ebile ha e na chefo, ha e halefise 'mele oa motho ka har'a letlalo, 'me e ka sebelisoa e le sejo se eketsang lijo. Leha ho le joalo, boemong ba 'nete ba taba ena, lerōle la eona le ka baka tšilafalo ea moea, 'me ha ho na thuso tlhokomelong ea letlalo ho le arola mollong ho qoba ho phatloha.
ho boloka metsi
Hydroxypropyl methylcellulose e khethehileng bakeng sa kaho e qoba tšebeliso e feteletseng ea metsi ke substrate, 'me metsi a lokela ho bolokoa ka har'a plaster ka hohle kamoo ho ka khonehang nakong eo gypsum e behiloeng ka botlalo. Thepa ena e ikhethang e bitsoa ho boloka metsi 'me e lekana ka ho toba le ho teteana ha tharollo ea hydroxypropyl methylcellulose e sebelisoang bakeng sa kaho ka har'a plaster. Ha ho teteana ha tharollo ho le holimo, phihlelo ea ho boloka metsi e ba holimo.
Thibelo ea ho thekesela
Seretse se nang le thepa e ikhethang ea ho thibela ho thella se ka sebelisoa ka lesela le teteaneng ntle le ho thella, e leng se bolelang hore seretse ka bosona ha se fetole bong ba sona, ho seng joalo se tla thella ha kaho e qala.
Fokotsa ho teteana le ho nolofatsa kaho
Kamora ho eketsa dihlahiswa tse fapaneng tsa hydroxypropyl methylcellulose tse ikgethang kaho, plaster e tala ya gypsum e nang le maikutlo a viscous hanyane e ka hlahiswa. Ha ho nkuwa ho loketse mme ho sebediswa sehlopha se tlase sa viscosity sa hydroxypropyl methylcellulose e ikgethang kaho, Tekanyo ya viscosity e fokotseha hanyane mme kaho e ba bonolo. Leha ho le jwalo, ho boloka metsi ha hydroxypropyl methylcellulose bakeng sa kaho e nang le viscosity e tlase ho fokola hanyane, mme ho hlokahala ho eketsa bongata ba ho eketsa.
Sekhahla sa ho lumellana ha polasetiki
Bakeng sa tekanyo e tsitsitseng ea seretse se omileng, ho theko e tlaase ho hlahisa seretse se metsi haholo, se ka finyelloang ka ho eketsa metsi le lipululana tse nyane. Leha ho le joalo, haeba bongata ba metsi le lipululana li le telele haholo, matla aa fokotseha.
Nako ea poso: Mmesa-26-2024