Cellulose ke polysaccharide e etsang mefuta e fapaneng ea li-ether tse qhibilihang ka metsing. Li-cellulose thickeners ke li-polymers tse qhibilihang metsing tse nonionic. Nalane ea tšebeliso ea eona e telele haholo, e feta lilemo tse 30, 'me ho na le mefuta e mengata. Li ntse li sebelisoa hoo e batlang e le lipente tsohle tsa latex 'me ke tsona tse ka sehloohong tsa li-thickeners. Li-cellullosic thickeners li sebetsa haholo lits'ebetsong tse nang le metsi hobane li tenya metsi ka botsona. Indastering ea pente, li-cellulose thickeners tse sebelisoang ka ho fetisisa ke: methyl cellulose (MC), hydroxyethyl cellulose (HEC), ethyl hydroxyethyl cellulose (EHEC), hydroxypropyl cellulose (HPC), hydroxypropyl methyl cellulose (HPMC) le hydrophobically modified hydroxyethyl cellulose. HMHEC). HEC ke polysaccharide e qhibilihang ka metsing e sebelisoang haholo ho tenya lipente tsa latex tsa matt le tse semi-gloss. Li-thickeners li fumaneha ka limaraka tse fapaneng tsa viscosity mme li-thickeners tse nang le selulose ena li na le tšebelisano e ntle ea mebala le botsitso ba polokelo.
Thepa e lekanang, e khahlanong le ho phatloha, ea ho etsa filimi le e khahlanong le ho senya ea filimi ea ho roala e itšetlehile ka boima ba molek'hule oa HEC. HEC le li-polymer tse ling tse sa amaneng le metsi a qhibilihang ka metsing li tenya karolo ea metsi ea ho roala. Li-cellulose thickeners li ka sebelisoa li le mong kapa li kopantsoe le li-thickeners tse ling ho fumana rheology e khethehileng. Li-cellulose ethers li ka ba le litekanyo tse fapaneng tse amanang le limolek'hule le limaraka tse fapaneng tsa viscosity, ho tloha ho boima bo tlase ba molek'hule 2% tharollo ea metsi e nang le viscosity e ka bang 10 MPS ho ea ho viscosity e phahameng e amanang le limolek'hule tsa 100 000 MP.S. Limaraka tse tlase tsa boima ba limolek'hule hangata li sebelisoa e le li-colloid tse sireletsang ho latex paint emulsion polymerization, 'me limaraka tse tloaelehileng haholo (viscosity 4 800–50 000 MP·S) li sebelisoa e le li-thickeners. Mokhoa oa mofuta ona oa thickener o bakoa ke ho phalla ho hoholo ha li-hydrogen bond le ho kenngoa pakeng tsa liketane tsa eona tsa molek'hule.
Selulose ea setso ke polima e boima ba limolek'hule e teteaneng haholo-holo ka ho ts'oara lipakeng tsa liketane tsa limolek'hule. Ka lebaka la viscosity e phahameng ka tekanyo e tlaase ea ho kuta, thepa ea boemo bo tlaase e fokola, 'me e ama khanya ea filimi ea ho roala. Ka tekanyo e phahameng ea ho kuta, viscosity e tlaase, ho hanyetsa ha filimi ea ho roala ho fokola, 'me botlalo ba filimi ea ho roala ha bo ntle. Litšobotsi tsa ts'ebeliso ea HEC, joalo ka ho hanyetsa borashe, ho etsa filimi le spatter ea roller, li amana ka kotloloho le khetho ea motenya. Hape thepa ea eona ea phallo e kang ho lekanngoa le ho hanyetsa sag e angoa haholo ke li-thickeners.
Hydrophobically modified cellulose (HMHEC) ke cellulose thickener e nang le phetoho ea hydrophobic ka liketane tse ling tse nang le makala (lihlopha tse 'maloa tsa alkyl tse telele li hlahisoa hammoho le ketane e kholo ea sebopeho). Ho roala hona ho na le viscosity e phahameng ka litekanyetso tse phahameng tsa ho kuta 'me ka hona sebopeho sa filimi se betere. Tse kang Natrosol Plus Grade 330, 331, Cellosize SG-100, Bermocoll EHM-100. Botenya ba eona bo ka bapisoa le botenya ba cellulose ether bo nang le boima bo boholo ba molek'hule. E ntlafatsa viscosity le boemo ba ICI, 'me e fokotsa tsitsipano ea holim'a metsi. Ka mohlala, tsitsipano ea holim'a HEC e ka bang 67 MN / m, 'me tsitsipano ea holim'a HMHEC ke 55 ~ 65 MN / m.
HMHEC e na le sprayability e ntle haholo, anti-sagging, thepa ea boemo bo holimo, botlolo e ntle le anti-pigment caking. E sebelisoa haholo 'me ha e na phello e mpe ho thehoeng ha filimi ea lipente tsa latex tse ntle. Ts'ebetso e ntle ea ho etsa lifilimi le ts'ebetso ea anti-corrosion. Sehlahisoa sena sa associative thickener se sebetsa betere ka lisebelisoa tsa vinyl acetate copolymer, 'me ts'ebetso ea eona e tšoana le li-thickeners tse ling tsa associative, empa ka mekhoa e bonolo.
Nako ea poso: Mar-16-2023