Ketsahalo ea ho theoha ha viscosity nakong ea polokelo ea pente ke bothata bo tloaelehileng, haholo-holo ka mor'a ho boloka nako e telele, ponahalo ea pente e fokotseha haholo, e amang ts'ebetso ea kaho le boleng ba sehlahisoa. Ho fokotseha ha viscosity ho amana le lintlha tse ngata, tse kang mocheso, mongobo, ho qhibiliha ha solvent, ho senyeha ha polymer, joalo-joalo, empa ho sebelisana le thickener cellulose ether ho bohlokoa haholo.
1. Karolo ea motheo ea cellulose ether
Cellulose ether ke setenya se tloaelehileng se sebelisoang haholo lipenteng tse thehiloeng metsing. Mesebetsi ea bona ea mantlha e kenyelletsa:
Thickening effect: Cellulose ether e ka etsa sebopeho sa marang-rang se ruruhileng sa mahlakore a mararo ka ho monya metsi, ka tsela eo ho eketsa viscosity ea tsamaiso le ho ntlafatsa thixotropy le ts'ebetso ea kaho ea pente.
Phello ea ho tsitsisa ho emisa: Cellulose ether e ka thibela ka katleho ho senyeha ha likaroloana tse tiileng tse kang li-pigment le li-filler ka pente le ho boloka ho tšoana ha pente.
Thepa ea ho etsa filimi: Cellulose ether e ka boela ea ama thepa ea ho etsa filimi ea pente, ho etsa hore seaparo se be le ho tiea ho itseng le ho tšoarella.
Ho na le mefuta e mengata ea li-cellulose ethers, ho akarelletsa le methyl cellulose (MC), hydroxyethyl cellulose (HEC), hydroxypropyl methyl cellulose (HPMC), joalo-joalo. Lisebelisoa tsena li na le ho qhibiliha ho fapaneng, bokhoni bo boima le ho hanyetsa ho boloka liphahlo.
2. Mabaka a ka sehloohong a ho fokotsa viscosity
Nakong ea ho boloka liphahlo, phokotso ea viscosity e bakoa haholo ke mabaka a latelang:
(1) Ho senyeha ha cellulose ethers
Phello e matla ea li-cellulose ethers ka liphahlo li itšetlehile ka boholo ba boima ba limolek'hule le botšepehi ba sebopeho sa bona sa limolek'hule. Nakong ea polokelo, lintlha tse kang mocheso, acidity le alkalinity, le likokoana-hloko li ka baka ho senyeha ha li-cellulose ethers. Ka mohlala, nakong ea polokelo ea nako e telele, likarolo tsa acidic kapa alkaline ka ho roala li ka 'na tsa e-ba le hydrolyze ketane ea molek'hule ea cellulose ether, ea fokotsa boima ba eona ba molek'hule, kahoo e fokolisa phello ea eona e teteaneng, e leng se fellang ka ho fokotseha ha viscosity.
(2) Solvent volatilization le ho falla ha mongobo
Solvent volatilization kapa ho falla ha mongobo ka har'a seaparo ho ka ama boemo ba ho qhibiliha ha cellulose ether. Nakong ea polokelo, karolo ea metsi e ka 'na ea fetoha mouoane kapa ea falla holim'a ho roala, ho etsa hore ho ajoa ha metsi ka ho roala ho sa lekane, ka tsela eo ho ama tekanyo ea ho ruruha ha cellulose ether le ho baka ho fokotseha ha viscosity libakeng tsa moo.
(3) Tlhaselo ea likokoana-hloko
Ho hōla ha likokoana-hloko ho ka 'na ha etsahala ka ho roala ha ho bolokoa ka tsela e fosahetseng kapa li-preservatives li fetoha tse sa sebetseng. Likokoana-hloko li ka bola li-cellulose ethers le tse ling tse teteaneng tsa tlhaho, tsa fokolisa phello ea tsona ea ho teteana le ho etsa hore viscosity ea seaparo se fokotsehe. Liaparo tse entsoeng ka metsi, haholo-holo, ke tikoloho e ntle ea kholo ea likokoana-hloko hobane li na le metsi a mangata.
(4) Botsofali bo phahameng ba mocheso
Tlas'a maemo a phahameng a ho boloka mocheso, sebopeho sa 'mele kapa sa lik'hemik'hale sa cellulose ether molecular chain e ka fetoha. Ka mohlala, li-cellulose ethers li na le tšekamelo ea ho oxidation kapa pyrolysis ka mocheso o phahameng, ho fella ka ho fokola ha phello e teteaneng. Lithempereichara tse phahameng li boetse li potlakisa ho fetoha ha metsi le mouoane oa metsi, e leng ho amang botsitso ba viscosity.
3. Mekhoa ea ho ntlafatsa botsitso ba polokelo ea liphahlo
Bakeng sa ho fokotsa ho fokotseha ha viscosity nakong ea polokelo le ho lelefatsa bophelo ba polokelo ea koae, mehato e latelang e ka nkuoa:
(1) Ho khetha ether ea cellulose e nepahetseng
Mefuta e fapaneng ea ethers ea cellulose e na le ts'ebetso e fapaneng mabapi le botsitso ba polokelo. Li-cellulose ethers tse nang le boima bo phahameng ba molek'hule ka kakaretso li na le liphello tse molemo tsa ho teteka, empa botsitso ba tsona ba polokelo bo batla bo fokola, ha li-cellulose ethers tse nang le boima bo tlaase ba molek'hule li ka ba le ts'ebetso e ntle ea polokelo. Ka hona, ha ho etsoa moralo, li-ether tsa cellulose tse nang le botsitso bo botle ba polokelo li lokela ho khethoa, kapa li-cellulose ethers li lokela ho kopanngoa le li-thickeners tse ling ho ntlafatsa ho hanyetsa ha tsona.
(2) Laola pH ea ho roala
Acidity le alkalinity ea mokhoa oa ho roala li na le tšusumetso ea bohlokoa ho tsitsitseng ha cellulose ethers. Moqaping oa ho etsoa, boleng ba pH ba ho roala bo lokela ho laoloa ho qoba tikoloho e nang le asiti e feteletseng kapa ea alkaline ho fokotsa ho senyeha ha cellulose ethers. Ka nako e ts'oanang, ho eketsa palo e nepahetseng ea pH ea sesebelisoa kapa buffer ho ka thusa ho tsitsisa pH ea sistimi.
(3) Eketsa tšebeliso ea li-preservatives
E le ho thibela khoholeho ea likokoana-hloko, palo e loketseng ea li-preservatives e lokela ho eketsoa ho koahela. Li-preservatives li ka thibela kholo ea likokoana-hloko, kahoo li thibela lintho tse phelang tse kang cellulose ether hore li se ke tsa senyeha le ho boloka botsitso ba ho roala. Li-preservatives tse loketseng li lokela ho khethoa ho ea ka sebopeho sa ho roala le tikoloho ea polokelo, 'me katleho ea tsona e lokela ho hlahlojoa khafetsa.
(4) Laola tikoloho ea polokelo
Mocheso oa polokelo le mongobo oa ho roala o na le tšusumetso e tobileng ho botsitso ba viscosity. Ho roala ho lokela ho bolokoa sebakeng se omeletseng le se pholileng, ho qoba mocheso o phahameng le maemo a mongobo o phahameng ho fokotsa ho senyeha ha solvent le cellulose ether degradation. Ntle le moo, liphutheloana tse tiisitsoeng hantle li ka fokotsa ho falla le mouoane oa metsi ka nepo le ho liehisa ho fokotseha ha viscosity.
4. Lintlha tse ling tse amang viscosity
Ntle le li-cellulose ethers, likarolo tse ling tsa tsamaiso ea ho roala li ka boela tsa ama phetoho ea viscosity. Ka mohlala, mofuta le mahloriso a li-pigments, lebelo la ho fetoha ha li-solvents, le ho lumellana ha li-thickeners tse ling kapa li-dispersants li ka ama botsitso ba viscosity ea ho roala. Ka hona, moralo o akaretsang oa mokhoa oa ho roala le tšebelisano lipakeng tsa likarolo le tsona ke lintlha tsa bohlokoa tse lokelang ho lebisoa tlhokomelo ho tsona.
Ho fokotseha ha viscosity nakong ea polokelo ea ho roala ho amana haufi-ufi le lintlha tse kang ho senyeha ha li-cellulose ethers, ho qhibiliha ha solvent, le ho falla ha metsi. Bakeng sa ho ntlafatsa botsitso ba polokelo ea ho roala, mefuta e nepahetseng ea cellulose ether e lokela ho khethoa, pH ea ho roala e lokela ho laoloa, mehato e thibelang ho bola e lokela ho matlafatsoa, le tikoloho ea polokelo e lokela ho ntlafatsoa. Ka moralo o nepahetseng oa moralo le taolo e ntle ea polokelo, bothata ba ho fokotseha ha viscosity nakong ea polokelo ea litlolo bo ka fokotsoa ka nepo, mme ts'ebetso ea sehlahisoa le tlholisano ea 'maraka li ka ntlafatsoa.
Nako ea poso: Sep-27-2024