1. Selelekela
Hydroxypropyl Methylcellulose (HPMC) ke polymer e qhibilihang ka metsing e sebelisoang haholo ho koahela, thepa ea mohaho, meriana le masimo a mang. Indastering ea ho roala, HPMC ha e sebelisoe feela joalo ka motenya, stabilizer le filimi ea pele, empa hape e le dispersant e sebetsang hantle haholo. Mesebetsi ea eona e ka sehloohong ea ho roala e kenyelletsa ho ntlafatsa botsitso ba liphahlo, ho ntlafatsa rheology, ho ntlafatsa ts'ebetso ea kaho le boleng ba seaparo sa ho qetela.
2. Litšobotsi tsa sebopeho sa HPMC
Sebopeho sa limolek'hule tsa HPMC se na le skeleton ea cellulose le hydroxypropyl le methyl substituents. Sebopeho sa eona se khethehileng se fa HPMC ho qhibiliha ka metsing le bokhoni ba ho etsa tharollo ea viscoelastic ka tharollo ea metsi. HPMC e sebelisana le limolek'hule tsa solvent ka hydrogen bonding le matla a van der Waals, kahoo e qhibiliha ka metsing ebe e etsa mokhoa o tsitsitseng oa ho hasana.
Boima ba molek'hule le degree of substitution (DS) ea HPMC e ama ho qhibiliha ha eona le viscosity. Ka kakaretso, boima bo phahameng ba limolek'hule le tekanyo ea ho fetola li eketsa viscosity le nako ea ho qhibiliha ea HPMC. Litšobotsi tsena li bohlokoa bakeng sa ts'ebetso ea HPMC joalo ka sehatsetsi sa ho roala.
3. Karolo ea HPMC ea ho roala
3.1 Ho ntlafatsa pigment dispersibility
HPMC e haholo-holo sebelisoa ho ntlafatsa dispersibility tsa pigments ka coatings. Ts'ebetsong ea tlhahiso ea liphahlo, ho kopana ha likaroloana tsa pigment ke bothata bo tloaelehileng, bo lebisang ho liphahlo tse sa tsitsang le tse sa tsitsang, tse amang gloss le mebala e tšoanang ea ho roala. Bahlaseli ba HPMC ba bapala karolo likarolong tse latelang:
Electrostatic repulsion: Tharollo e entsoeng ke HPMC e qhibilihang ka metsing e na le ts'ebetso e phahameng ea holim'a metsi 'me e ka ba adsorbed holim'a likaroloana tsa pigment ho etsa hore li qosoe. Sena se repulsion electrostatic arola likaroloana pigment mong ho e mong le ho fokotsa agglomeration.
Tšitiso ea steric: Ketane ea polymer ea HPMC e ka theha lera le sireletsang holim'a likaroloana tsa pigment, ea eketsa sebaka sa sebaka pakeng tsa likaroloana, 'me kahoo e thibela ho hoheloa le ho kopana pakeng tsa likaroloana.
Phello ea botsitso: HPMC e kopanya le limolek'hule tsa metsi ka litlamo tsa haedrojene ho theha tsamaiso e tsitsitseng ea tharollo, ho thibela likaroloana tsa pigment hore li se ke tsa lula tsamaisong, le ho ntlafatsa botsitso ba ho roala.
3.2 Ho ntlafatsa rheology
Mosebetsi o mong oa bohlokoa oa HPMC ke ho ntlafatsa rheology ea liphahlo, ke hore, phallo le litšobotsi tsa deformation tsa liphahlo. Lintho tse ntle tsa rheological tsa ho roala li thusa hore li be le ho ata hantle le ho lekanngoa nakong ea ts'ebetso ea kaho, ho etsa filimi ea ho roala junifomo. HPMC e ama thepa ea rheological ea ho roala ka mekhoa e latelang:
Ntlafatso ea Viscoelasticity: Sebopeho sa marang-rang sa polymer chain se entsoeng ke HPMC metsing se fana ka tharollo ea viscoelasticity e itseng. Viscoelasticity ena e ka fetola boitšoaro ba phallo ea ho roala, e le hore e be le viscosity e loketseng ha u hlatsoa, ho fokotsa ho theoha le ho rotha.
Ho fokotsa ho kuta: Litharollo tsa HPMC hangata li bonts'a thepa ea ho kuta, ke hore, li na le viscosity e phahameng ka litekanyetso tse tlase tsa ho kuta le viscosity e tlase ka litekanyetso tse phahameng tsa ho kuta. Thepa ena e etsa hore ho roala ho be le botsitso bo betere boemong bo tsitsitseng mme ho bonolo ho hasana nakong ea kaho.
Thixotropy: Litharollo tse ling tsa HPMC li boetse li bonts'a thixotropy, ke hore, viscosity e tsosolosoa ha e phomola, e leng ea bohlokoa ka ho khetheha ho fokotsa ho senya le ho rotha ha seaparo.
3.3 Ho ntlafatsa ts'ebetso ea ho roala
HPMC ha e na tšusumetso ea bohlokoa feela ts'ebetsong ea ho roala nakong ea kaho, empa hape e ntlafatsa haholo boleng ba seaparo sa ho qetela. HPMC e ntlafatsa ts'ebetso ea liphahlo likarolong tse latelang:
Ho roala boreleli: HPMC e ntlafatsa rheology ea ho roala, e ntlafatsa ho ata le ho lekana ha seaparo, 'me e etsa hore seaparo se be bonolo le ho tšoana.
Ho hanyetsa metsi le ho hanyetsa boemo ba leholimo: HPMC e theha mohaho o teteaneng oa marang-rang ka har'a ho roala, e leng ho eketsang ho hanyetsa metsi le matla a ho thibela botsofali ba ho roala, le ho ntlafatsa ho hanyetsa boemo ba leholimo ba ho roala.
Ho khomarela: HPMC e ntlafatsa ho khomarela ha seaparo, e le hore seaparo se ka khomarela ka thata holim'a substrate, 'me se ntlafatsa ho tšoarella ha seaparo.
4. Mehlala ea ts'ebeliso ea HPMC
4.1 Liaparo tsa meralo
Ka liphahlo tsa meralo, HPMC e sebelisetsoa ho ntlafatsa ho hasana ha li-pigments le rheology ea liphahlo, haholo-holo bakeng sa liphahlo tse thehiloeng metsing. HPMC e ntlafatsa botsitso le ts'ebetso ea kaho ea ho roala, e le hore seaparo se be le boemo bo betere le ho khomarela leboteng, 'me se thibele filimi ho senya le ho roala ho sa tšoaneng.
4.2 Liaparo tsa indasteri
HPMC e boetse e sebelisoa haholo ka liphahlo tsa indasteri. Ha e ntlafatse feela dispersibility ea li-pigments, empa hape e ntlafatsa ts'ebetso ea kaho ea liphahlo, e etsa hore filimi ea ho roala e khomarele tšepe, polasetiki le li-substrates tse ling, 'me filimi e entsoeng ea ho roala e tšoarella haholoanyane.
4.3 Liaparo tse ling
HPMC e boetse e sebelisoa ka liphahlo tse fapaneng tse khethehileng, tse kang liphahlo tse thibelang mollo, li-anti-corrosion coatings, joalo-joalo, karolo ea eona ho liphahlo tsena ke haholo-holo ho ntlafatsa botsitso ba liphahlo le ts'ebetso ea filimi ea ho roala, e le hore liphahlo li be le ts'ebetso e ntle ka ho fetisisa. maemo a fapaneng a rarahaneng.
Joalo ka sehatsetsi sa ho roala, HPMC e bapala karolo ea bohlokoa ho ntlafatseng ha li-pigments, ho ntlafatsa rheology ea liphahlo le ho ntlafatsa ts'ebetso ea lifilimi tsa ho roala. Sebopeho le ts'ebetso ea eona e ikhethang li e fa menyetla e mengata ea ts'ebeliso indastering ea ho roala. Ka nts'etsopele ea theknoloji ea ho roala, ts'ebeliso ea HPMC e tla tsoela pele ho hola, ho fana ka menyetla e mengata ea ntlafatso le boqapi ba ts'ebetso ea ho roala.
Nako ea poso: Jun-25-2024