Sekhomaretsi sa lithaele ke e 'ngoe ea lisebelisoa tse kholo ka ho fetisisa tsa seretse se khethehileng sa motsoako o omileng hajoale.Ena ke mofuta oa samente e le thepa ea mantlha ea cementitious 'me e tlatselletsoa ke li-aggregates tse hlophisitsoeng, li-agent tse bolokang metsi, li-agents tsa pele tsa matla, phofo ea latex le li-additives tse ling tsa organic kapa inorganic.motsoako.Ka kakaretso, e hloka feela ho tsoakoa le metsi ha e sebelisoa.Ha e bapisoa le seretse se tloaelehileng sa samente, e ka ntlafatsa haholo matla a maqhama pakeng tsa thepa e shebaneng le substrate, e na le khanyetso e ntle ea ho thella 'me e na le ho hanyetsa metsi hantle le ho hanyetsa mocheso.'Me melemo ea ho hanyetsa potoloho ea leqhoa, haholo-holo e sebelisetsoang ho peista lithaele tse ka hare le tse ka ntle tsa lerako, lithaele tsa fatše le lisebelisoa tse ling tse khabisitsoeng, tse sebelisoang haholo marakong a ka hare le a ka ntle, fuluru, likamore tsa ho hlapela, kichine le libaka tse ling tsa mokhabiso oa meralo. lisebelisoa tse sebelisoang haholo ka ho fetisisa tsa lithaele tsa ceramic.
Hangata ha re ahlola ts'ebetso ea sekhomaretsi sa lithaele, ha re ele hloko feela ts'ebetso ea eona ea ts'ebetso le bokhoni ba ho thibela ho thella, empa hape re ela hloko matla a eona a mochine le nako ea ho bula.Cellulose etherka sekhomaretsi sa lithaele ha se ame feela thepa ea rheological ea sekhomaretsi sa porcelain, joalo ka ts'ebetso e boreleli, ho khomarela thipa, joalo-joalo, empa hape e na le tšusumetso e matla ho thepa ea mochini ea sekhomaretsi sa lithaele.Tšusumetso nakong ea ho bula ea sekhomaretsi sa lithaele
Ha phofo ea emulsion le cellulose ether li kopane ka seretse se metsi, lintlha tse ling li bontša hore phofo ea emulsion e na le matla a matla a kinetic ho hokela lihlahisoa tsa samente hydration, 'me cellulose ether e teng ho feta mokelikeli oa interstitial, o amang seretse ho feta viscosity le ho beha nako.Khatello ea holim'a cellulose ether e phahame ho feta ea phofo ea emulsion, 'me ho ntlafatsa selulose ether ho feta sebopeho sa seretse ho tla ba molemo ho thehoeng ha maqhama a hydrogen pakeng tsa bokaholimo ba motheo le cellulose ether.
Ka seretse se metsi, metsi a seretse a fetoha mouoane, 'me cellulose ether e ntlafatsoa ka holim'a metsi,' me filimi e tla thehoa holim'a seretse ka metsotso e 5, e leng ho tla fokotsa sekhahla se latelang sa mouoane, kaha metsi a mangata a ntse a eketseha. tlosoa seretse se teteaneng Karolo e 'ngoe ea eona e fallela sebakeng se mosesaane sa seretse,' me filimi e entsoeng qalong e qhibiliha ka mokhoa o sa fellang, 'me ho falla ha metsi ho tla tlisa ntlafatso ea cellulose ether holim'a seretse.
Ka hona, sebopeho sa filimi ea cellulose ether holim'a seretse se na le tšusumetso e kholo ts'ebetsong ea seretse.
1) Filimi e entsoeng e tšesaane haholo 'me e tla qhibiliha ka makhetlo a mabeli, e sitoa ho fokotsa mouoane oa metsi le ho fokotsa matla.
2) Filimi e entsoeng e teteaneng haholo, motsoako oa cellulose ether ka mokelikeli oa seretse oa interstitial o phahame, 'me viscosity e phahame, kahoo ha ho bonolo ho senya filimi ea holim'a metsi ha lithaele li kenngoa.
Ho ka bonoa hore thepa ea ho etsa filimi ea cellulose ether e na le tšusumetso e kholo nakong e bulehileng.Mofuta oa cellulose ether (HPMC, HEMC, MC, joalo-joalo) le tekanyo ea etherification (degree ea substitution) e ama ka ho toba thepa ea filimi ea cellulose ether, le ho thatafala le ho tiea ha filimi.
Ntle le ho fana ka thepa ea molemo e boletsoeng ka holimo ho seretse, cellulose ether e boetse e liehisa hydration kinetics ea samente.Phello ena e sitisang haholo e bakoa ke ho ata ha limolek'hule tsa cellulose ether mekhahlelong e fapaneng ea liminerale tsamaisong ea samente e ntseng e nosetsoa, empa ka kakaretso, tumellano ke hore limolek'hule tsa cellulose ether li khabisitsoe haholo metsing a kang CSH le calcium hydroxide.Lihlahisoang tsa lik'hemik'hale, ha se hangata li hlahisoang karolong ea pele ea liminerale ea clinker.Ho phaella moo, cellulose ether e fokotsa ho tsamaea ha li-ion (Ca2+, SO42-, ...) ka tharollo ea pore ka lebaka la ho eketseha ha viscosity ea tharollo ea pore, kahoo ho lieha ho feta ts'ebetsong ea hydration.
Viscosity ke parameter e 'ngoe ea bohlokoa, e emelang litšobotsi tsa lik'hemik'hale tsa cellulose ether.Joalokaha ho boletsoe ka holimo, viscosity e ama haholo matla a ho boloka metsi hape e na le phello e kholo ho sebetsa ha seretse se secha.Leha ho le joalo, liphuputso tsa liteko li fumane hore viscosity ea cellulose ether ha e na phello ho samente hydration kinetics.Boima ba limolek'hule bo na le phello e fokolang ho hydration, 'me phapang e kholo pakeng tsa boima ba limolek'hule tse fapaneng ke 10min feela.Ka hona, boima ba limolek'hule ha se karolo ea bohlokoa ea ho laola metsi a samente.
"Kopo ea Cellulose Ether ka Lihlahisoa tsa Seretse se Omileng se Omileng sa Cement" se bontšitse hore ho lieha ha cellulose ether ho itšetlehile ka sebopeho sa eona sa lik'hemik'hale.'Me mokhoa o akaretsang o fihletsoeng ke hore bakeng sa MHEC, tekanyo e phahameng ea methylation, e nyenyane e fokotsa phello ea cellulose ether.Ho phaella moo, phello e fokolisang ea hydrophilic substitution (e kang ho kenya sebaka sa HEC) e matla ho feta ea hydrophobic substitution (e kang ho fetola MH, MHEC, MHPC).Phello e fokolisang ea cellulose ether e angoa haholo ke liparamente tse peli, mofuta le bongata ba lihlopha tse nkang sebaka.
Liteko tsa sistimi li boetse li fumane hore litaba tsa li-substituent li phetha karolo ea bohlokoa ho matla a mochini a likhomaretsi tsa lithaele.Bakeng sa HPMC, ho hlokahala tekanyo e itseng ea phepelo ho netefatsa hore metsi a qhibiliha le ho fetisoa ha leseli.Likahare tsa li-substitute li boetse li lekanya matla a HPMC.Mocheso oa mocheso oa gel o boetse o etsa qeto ea tikoloho ea tšebeliso ea HPMC.Ka har'a mefuta e itseng, ho eketseha ha likahare tsa lihlopha tsa methoxyl ho tla tlisa mokhoa oa ho theoha ho matla a ho hula, ha keketseho ea litaba tsa lihlopha tsa hydroxypropoxyl e tla lebisa ho fokotseha ha matla a ho hula.ho phahama mokgoa.Ho na le phello e tšoanang bakeng sa lihora tsa ho bula.
Phetoho ea matla a mochine tlas'a boemo ba nako e bulehileng e lumellana le maemo a tloaelehileng a mocheso.HPMC e nang le dikahare tse phahameng tsa methoxyl (DS) le dikahare tse tlase tsa hydroxypropoxyl (MS) e na le boima bo botle ba filimi, empa e tla ama seretse se metsi ho fapana le hoo.thepa ea ho kolobisa lintho.
Nako ea poso: Dec-12-2022