Lihlopha tsa hydroxyl li sebetsacellulose etherlimolek'hule le liathomo tsa oksijene holim'a litlamo tsa ether li tla theha likamano tsa hydrogen le limolek'hule tsa metsi, li fetole metsi a sa lefelloeng hore e be metsi a tlamiloeng, kahoo a bapala karolo e ntle ea ho boloka metsi; Phapang pakeng tsa limolek'hule tsa metsi le liketane tsa limolek'hule tsa cellulose ether li lumella limolek'hule tsa metsi hore li kene ka hare ho ketane ea cellulose ether macromolecular 'me li be tlas'a lithibelo tse matla, kahoo li etsa metsi a sa lefelloeng le metsi a ferekaneng, a ntlafatsang ho boloka metsi a samente slurry; cellulose ether e ntlafatsa thepa ea rheological, sebopeho sa marang-rang sa porous le khatello ea osmotic ea slurry e ncha ea samente kapa thepa ea ho etsa filimi ea cellulose ether e sitisa ho hasana ha metsi.
Ho boloka metsi a cellulose ether ka boeona ho tsoa ho solubility le dehydration ea cellulose ether ka boeona. Matla a hydration a lihlopha tsa hydroxyl feela ha a lekana ho lefella litlamo tse matla tsa hydrogen le matla a van der Waals pakeng tsa limolek'hule, kahoo e ruruha feela empa ha e qhibilihe ka metsing. Ha substituents hlahiswa ka ketane ea limolek'hule, eseng feela hore substituents senya liketane tsa haedrojene, empa hape le ditlamo interchain haedrojene timetsoa ka lebaka la wedging ea substituents pakeng tsa liketane tse haufi. Li-substituent tse kholoanyane, sebaka se pakeng tsa limolek'hule se seholo, 'me phello ea ho senya li-hydrogen bond e kholoanyane. Ka mor'a hore lesela la cellulose le ruruhe, tharollo e kena, 'me cellulose ether e fetoha e qhibilihang ka metsing, e etsa tharollo e phahameng ea viscosity, e ntan'o phetha karolo ea ho boloka metsi.
Lintlha tse amang ts'ebetso ea ho boloka metsi:
Viscosity: Ho ba le viscosity e kholo ea cellulose ether, ts'ebetso ea ho boloka metsi e betere, empa ha ponahalo e phahame, boima ba molek'hule ea cellulose ether e phahame, 'me ho qhibiliha ha eona ho fokotseha ho ea ka tsela e nepahetseng, e leng se nang le phello e mpe ho tsepamiso ea maikutlo le ts'ebetso ea kaho. ea seretse. Ka kakaretso, bakeng sa sehlahisoa se le seng, liphetho tsa viscosity tse lekantsoeng ka mekhoa e fapaneng li fapane haholo, kahoo ha ho bapisoa viscosity, e tlameha ho etsoa lipakeng tsa mekhoa e tšoanang ea liteko (ho kenyeletsoa mocheso, rotor, joalo-joalo).
Palo ea tlatsetso: Ha palo e kholo ea cellulose ether e kentsoeng seretseng, e ntlafatsa ts'ebetso ea ho boloka metsi. Hangata, palo e nyane ea cellulose ether e ka ntlafatsa haholo sekhahla sa ho boloka metsi a seretse. Ha chelete e fihla boemong bo itseng, mokhoa oa ho eketsa sekhahla sa ho boloka metsi oa fokotseha.
Particle fineness: Ha likaroloana li le ntle, ho boloka metsi ho molemo. Ha likaroloana tse kholo tsa cellulose ether li kopana le metsi, bokaholimo boa qhibiliha hang-hang ebe ho etsa gel ho phuthela thepa ho thibela limolek'hule tsa metsi ho tsoela pele ho kenella. Ka linako tse ling, esita le nako e telele e tsosang takatso e ke ke ea finyella ho hasana ho tšoanang le ho qhibiliha, ho etsa tharollo ea turbid flocculent kapa agglomeration, e amang haholo ho boloka metsi a cellulose ether. Solubility ke e 'ngoe ea lintlha tsa ho khetha cellulose ether. Fineness hape ke sesupo sa bohlokoa sa ts'ebetso ea methyl cellulose ether. Fineness e ama ho qhibiliha ha methyl cellulose ether. Coarser MC hangata ke granular 'me e ka qhibiliha habonolo ka metsing ntle le agglomeration, empa sekhahla sa ho qhibiliha se lieha haholo' me ha sea lokela ho sebelisoa seretseng se omileng.
Mocheso: Ha mocheso oa tikoloho o ntse o phahama, ho boloka metsi a cellulose ethers hangata ho fokotseha, empa li-ether tse ling tse fetotsoeng tsa cellulose li boetse li na le ho boloka metsi hantle tlas'a maemo a phahameng a mocheso; ha mocheso o phahama, hydration ea li-polymers e fokotseha, 'me metsi a pakeng tsa liketane a lelekoa. Ha ho felloa ke metsi 'meleng ho lekane, limolek'hule li qala ho bokellana ho etsa gel ea sebopeho sa marang-rang a mararo.
Sebopeho sa limolek'hule: Li-ether tsa cellulose tse nang le sebaka se tlaase li na le ho boloka metsi ho molemo.
Thickening le thixotropy
Ho tenya:
Phello ho bokhoni ba tlamahano le ts'ebetso e khahlanong le ho sisinyeha: Cellulose ethers e fana ka seretse se nang le viscosity e ntle haholo, e ka eketsang haholo bokhoni ba tlamahano ea seretse se metsi le lera la motheo le ho ntlafatsa ts'ebetso e khahlanong le ho sisinyeha ha seretse. E sebelisoa haholo bakeng sa seretse sa plastering, seretse se kopanyang lithaele le sistimi ea kantle ea ho kenya lebota 3.
Phello ho homogeneity ea lintho tse bonahalang: Phello e ntseng e eketseha ea li-cellulose ethers e ka boela ea eketsa bokhoni ba ho thibela ho hasana le homogeneity ea thepa e sa tsoa tsoakoa, ho thibela stratification ea thepa, karohano le metsi a phallang, 'me e ka sebelisoa ka konkreite ea fiber, konkreite e ka tlas'a metsi le konkreite e ikemetseng. .
Mohloli le tšusumetso ea phello e teteaneng: Tšusumetso e teteaneng ea cellulose ether linthong tse thehiloeng ho samente e tsoa ho viscosity ea selulose ether solution. Tlas'a maemo a ts'oanang, ho phahama ha viscosity ea cellulose ether, ho ntlafatsa ponahalo ea lintho tse fetotsoeng tse thehiloeng ho samente, empa haeba viscosity e phahame haholo, e tla ama ho phalla le ho sebetsa ha thepa (e kang ho khomarela thipa ea plastering. ). Seretse se ikemetseng le konkreite e ikemetseng e nang le litlhoko tse phahameng tsa metsi li hloka viscosity e tlase haholo ea cellulose ether. Ho phaella moo, phello e matla ea cellulose ether e tla boela e eketse tlhokahalo ea metsi ea thepa e thehiloeng ho samente le ho eketsa tlhahiso ea seretse.
Thixotropy:
High-viscosity cellulose ether aqueous solution e na le thixotropy e phahameng, eo hape e leng tšobotsi e kholo ea cellulose ether. Tharollo ea metsi ea methyl cellulose hangata e na le pseudoplasticity le non-thixotropic fluidity ka tlase ho mocheso oa gel, empa e bonts'a thepa ea phallo ea Newtonian ka litheko tse tlase tsa ho kuta. Pseudoplasticity e eketseha ka keketseho ea cellulose ether ea boima ba molek'hule kapa mahloriso, 'me ha e amane letho le mofuta oa sebaka le tekanyo ea ho fetola. Ka hona, li-cellulose ethers tsa sehlopha se tšoanang sa viscosity, ebang ke MC, HPMC, kapa HEMC, kamehla li bontša litšobotsi tse tšoanang tsa rheological hafeela mahloriso le mocheso li lula li le teng. Ha mocheso o phahama, gel ea sebopeho e thehoa, 'me ho hlaha phallo e phahameng ea thixotropic. Li-cellulose ethers tse nang le mahloriso a phahameng le viscosity e tlaase li bontša thixotropy esita le ka tlase ho mocheso oa gel. Thepa ena e molemo haholo bakeng sa ho lokisa boemo le ho thella ha seretse sa moaho nakong ea kaho.
Ho kenella moeeng
Molao-motheo le phello ea ts'ebetso ea ts'ebetso: Cellulose ether e na le phello e kholo ea ho kenya moea linthong tse ncha tse thehiloeng ho samente. Cellulose ether e na le lihlopha tse peli tsa hydrophilic (lihlopha tsa hydroxyl, lihlopha tsa ether) le lihlopha tsa hydrophobic (lihlopha tsa methyl, mehele ea glucose). Ke surfactant e nang le ts'ebetso e kaholimo, ka hona e na le phello ea moea. Phello ea ho kenya moea e tla hlahisa phello ea bolo, e ka ntlafatsang ts'ebetso ea ts'ebetso ea lisebelisoa tse sa tsoa tsoakoa, tse kang ho eketsa polasetiki le boreleli ba seretse nakong ea ts'ebetso, e leng molemo ho jala seretse; hape e tla eketsa tlhahiso ea seretse le ho fokotsa litšenyehelo tsa tlhahiso ea seretse.
Phello ho thepa ea mochini: Phello ea ho kenya moea e tla eketsa porosity ea thepa e thata le ho fokotsa thepa ea eona ea mechine e kang matla le elastic modulus.
Phello ho mokelikeli: Joaloka surfactant, cellulose ether e boetse e na le phello ea ho kolobisa kapa ea ho tlotsa likaroloana tsa samente, tseo hammoho le phello ea eona ea ho kenya moea e eketsang metsi a thepa e thehiloeng ho samente, empa phello ea eona e teteaneng e tla fokotsa metsi. Phello ea cellulose ether ho fluidity ea thepa e entsoeng ka samente ke motsoako oa polasetiki le liphello tse teteaneng. Ka kakaretso, ha tekanyo ea ether ea cellulose e le tlase haholo, e bontša haholo-holo e le polasetiki kapa liphello tsa ho fokotsa metsi; ha tekanyo e phahame, phello e teteaneng ea cellulose ether e eketseha ka potlako, 'me phello ea eona ea ho kenya moea e atisa ho tlala, kahoo e bonahala e le ho teteaneng kapa ho eketseha ha tlhokahalo ea metsi.
Nako ea poso: Dec-23-2024