Hydroxypropyl methylcelluloseke cellulose ether e hlahang ka tlhaho, e seng kotsi 'meleng oa motho. Leha ho le joalo, lisebelisoa tse tala tsa li-cotton linters le HPMC tse sebelisoang fekthering kaofela li na le sefahleho, 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 tsa tlhaho ka ho kopanya alkali, karabelo ea grafting, ho hlatsoa, ho omisa, ho sila le mekhoa e meng. E ke ke ea beha bophelo ba batho kotsing.
Hydroxypropyl methyl cellulose, eo hape e tsejoang e le hypromellose le cellulose hydroxypropyl methyl ether, e entsoe ka ho sebelisa selulose e hloekileng haholo ea k'hothone e le thepa e tala le ho fumana etherification e khethehileng tlasa maemo a alkaline.
Motsoako oa hydroxypropyl methylcellulose: cellulose e hloekisitsoeng ea k'hothone e tšoaroa ka lye ho 35-40 ℃ bakeng sa halofo ea hora, e petelitsoe, selulose ea pshatleha, 'me botsofali bo etsoa ka 35 ℃ ho etsa hore alkali fiber e fumanoe ka mokhoa o tšoanang polymerized. Ka har'a sebaka se hlokahalang. Kenya fiber ea alkali ka har'a kettle ea etherification, eketsa propylene oxide le methyl chloride ka tatellano, 'me etherify ho 50-80 ℃ bakeng sa 5h,' me khatello e ka holimo e ka bang 1.8MPa. Ebe u eketsa tekanyo e loketseng ea hydrochloric acid le oxalic acid ho hlatsoa lisebelisoa ka metsi a chesang ka 90 ° C ho eketsa boholo le molumo. Dehydrate ka centrifugation. Swash ho isa ho se nke lehlakore. Ha metsi a ka har'a thepa a le ka tlase ho 60%, o omise ka ho phalla ha moea o chesang ho 130 ° C ho ea boemong bo ka tlase ho 5%.
HPMC e hlahisoang ke mokhoa oa solvent e sebelisa toluene le isopropanol e le mokelikeli. Haeba e hlatsuoa hampe haholo, e tla ba le monko o setseng hanyane. Ena ke bothata ba mokhoa oa ho hlatsoa, o sa ameng tšebeliso kapa bothata leha e le bofe.
Hypromellose ke k'hothone e hloekisitsoeng eo hangata e kenngoeng ka mokelikeli ho fumana selulose ea alkaline, ebe e kenya letsoho ho li-solvents, li-etherification agents, toluene le isopropanol bakeng sa liketso tsa etherification, 'me ha e nke lehlakore, e hlatsuoa, e omisitsoe le ho pshatla ho fumana lihlahisoa tse felileng. E mpe haholo ebile e monko, kahoo basebelisi ba ka e sebelisa ka mokhoa o tsitsitseng.
Hydroxypropyl methylcellulose e lokela ho ela hloko lintho tse latelang ts'ebelisong:
Ka phello ea phofo ea seretse, hydroxypropyl methylcellulose e bapala feela phello e tšehetsang, 'me ha e kenye letsoho leha e le efe ea lik'hemik'hale. Phofo ea seretse e kenngoa ka metsi ebe e behoa leboteng, e leng ts'ebetso ea lik'hemik'hale. Ka lebaka la ho thehoa ha lintho tse ncha, phofo ea seretse leboteng e ntšoa leboteng ebe e siloa ho ba phofo ho etsa lintho tse ncha. Hydroxypropyl methylcellulose e boloka metsi feela mme e thusa grey calcium ho ba le karabelo e ntle, empa ha e kopanele karabong efe kapa efe.
Hydroxypropyl Methyl Cellulose HPMC ha e kenye letsoho ts'ebetsong leha e le efe ea lik'hemik'hale, empa e thusa feela. Eketsa metsi ho phofo ea seretse 'me ue behe leboteng, ke ts'ebetso ea lik'hemik'hale. Ka lebaka la ho thehoa ha lintho tse ncha, phofshoana ea seretse leboteng e tlosoa leboteng 'me e siloa ka phofo,' me joale ha e khonehe, hobane lintho tse ncha li thehiloe NS. Likarolo tse ka sehloohong tsa phofo e grey calcium ke: Ca(OH)2, motsoako oa CaO le palo e nyane ea CaCO3, CaO.
H2O=Ca(OH)2-Ca(OH)2 CO2=CaCO3↓ H2O
Gray calcium e hlahisa lintho tse ling tlas'a phello ea metsi le CO2 moeeng, ha HPMC e boloka metsi feela 'me e thusa k'halsiamo e bohlooho ho ba le karabo e molemo. Ha e kenye letsoho karabong 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 arohane le mokhoa oa ho etsa lihlahisoa. Joale, 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.
Pele ho tsohle, indastering ea kaho, e ka nkuoa e le sesebelisoa sa ho fokotsa metsi le ho boloka metsi. Seretse sa seretse se pompeha, kahoo seretse sohle se omeletseng seo re se sebelisang se na le seabo sa sona. Ho phaella moo, linthong tsa kaho tse kang gypsum e tala, samente le phofo ea seretse, e ka sebelisoa e le se tlamahanyang, e leng se eketsang nako ea ho sebetsa, empa hape se etsa hore pente e tlosoe haholoanyane. Ka 'mabole, lithaelese tsa ceramic tsa sekhomaretsi, mekhabiso ea polasetiki ea motsoako oa limolek'hule, e ka sebelisoa e le sehlahisoa sa adhesion, joalo-joalo Ho ka boleloa hore hydroxypropyl methyl cellulose ke eona e tummeng ka ho fetisisa ka ho feto-fetoha ha thepa ea mohaho.
Liindastering tse ling, tse kang ho etsa porcelain le letsopa, e ka sebelisoa e le sekhomaretsi bakeng sa ho etsa lihlahisoa tsa porcelain le letsopa; indastering ea lacquer le khatiso ea enke, e ka sebelisoa e le phofo e hlephileng, thickener, stabilizer, esita le hobane e ka kopanngoa le organic Solvent kapa motsoako oa metsi ka bokhabane, 'me e ka sebelisoa e le ho tlosa pente ha ho etsoa lipolasetiki tsa motsoako oa limolek'hule. , hammoho le li-softeners, lisebelisoa tsa ho lokolla hlobo, litlolo, joalo-joalo; ha ho etsoa polyvinyl chloride, e nkoa e le phofo e hlephileng.
Lihlahisoa tse entsoeng ka hydroxypropyl methylcellulose li sebelisoa haholo ho hlahisa litholoana le meroho, meriana, matlalo a liphoofolo le liindasteri tsa masela. E bolokehile ebile ha e na chefo, ha e halefise haholo letlalo la 'mele oa motho le letlalo,' me e ka sebelisoa e le tlatsetso ea lijo. Leha ho le joalo, boemong ba sebele ba taba, lerōle la eona le ka ’na la baka tšilafalo ea moea, ’me ha ho molemo ho boloka 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 ho feletseng. Thepa ena e khethehileng e bitsoa ho boloka metsi 'me e lekana ka ho toba le viscosity ea tharollo ea hydroxypropyl methylcellulose e sebelisetsoang ho haha ka plaster. Ho phahama ha viscosity ea tharollo, ho eketsa boiphihlelo ba ho boloka metsi.
Anti-sagging
Seretse se nang le thepa e khethehileng ea anti-sagging se ka sebelisoa ka lesela le lengata ntle le ho sisinyeha, e leng se bolelang hore seretse ka boeona ha se fetole bong ba sona, ho seng joalo se tla thellela fatše ha mohaho o qala.
Fokotsa viscosity le ho nolofatsa kaho
Kamora ho kenyelletsa lihlahisoa tse fapaneng tsa hydroxypropyl methylcellulose, ho ka hlahisoa plaster e tala ea gypsum e nang le moea o bobebe oa viscous. Ha ho nkoa e le ho loketseng 'me ho sebelisoa kereiti e tlase ea viscosity ea hydroxypropyl methylcellulose e khethehileng ea kaho, Tekanyo ea viscosity e batla e fokotsehile mme kaho e ba bonolo. Leha ho le joalo, ho boloka metsi a hydroxypropyl methylcellulose bakeng sa kaho e tlaase ea viscosity e batla e fokola, 'me hoa hlokahala ho eketsa palo ea ho eketsa.
Sekhahla sa ho lumellana ha polasetiki
Bakeng sa palo e tsitsitseng ea seretse se omeletseng, ho na le chelete e ngata ho hlahisa boholo bo phahameng ba seretse se metsi, se ka finyelloang ka ho eketsa metsi a seng makae le li-bubble. Leha ho le joalo, haeba palo ea metsi le li-bubble li le telele haholo, matla a senyeha.
Nako ea poso: Apr-26-2024