Cellulose yog polysaccharide uas ua ntau yam dej-soluble kev ua neej. Cellulose thickeners yog cov dej tsis muaj dej-soluble polymers. Nws siv keeb kwm ntev heev, ntau dua 30 xyoo, thiab muaj ntau yam. Lawv tseem siv nyob rau hauv yuav luag txhua cov xim looj kua thiab yog cov tseem ceeb ntawm cov thickeners. Cellulosic thickeners muaj txiaj ntsig zoo heev vim tias lawv thicken dej lawv tus kheej. Hauv kev lag luam pleev xim, feem ntau siv cellulose thickeners yog:Methyl Cellulose (MC), hydroxyethyl cellulose (HEC), Ethyl hydrotyl cellulose (EHEC), Hydroxyprropyl cellulose (HPC),HydroxyPropylropy Cellulose (HPMC)Thiab hydrophobically hloov hydroxyethyl cellulose (HMHEC). HEC yog dej-soluble polysaccharide dav siv nyob rau hauv lub thickening ntawm matt thiab ib nrab gloss architectural looj xim looj. Thickeners muaj nyob rau hauv viscosity sib txawv thiab thickeners nrog cov cellulose no muaj cov xim zoo nkauj thiab kev ruaj khov.
Kev ua yeeb yam, tiv thaiv kev sib txaws, ua yeeb yaj kiab ua yeeb yaj kiab thiab tawm tsam cov khoom ntawm txheej sib npaug ntawmTus paCov. HEC thiab lwm yam tsis cuam tshuam dej-soluble polymers thicken squeous theem ntawm txheej. Cellulose thickeners tuaj yeem siv nyob ib leeg lossis ua ke nrog lwm cov thickeners kom tau txais cov rhuaology tshwj xeeb. Cov kev hais daws cellulose tuaj yeem muaj cov neeg txheeb ze lub cev thiab cov qib sib txawv ntawm qhov 10 MP s kom zoo nkauj molecular hnyav viscosity ntawm 100 000 Mp s. Cov qib nyhav qis feem ntau yog siv los ua cov xim tiv thaiv hauv looj (viscosity 4 800-50 000 mp · s) yog siv raws li cov tuab. Lub tshuab ntawm cov thickener no vim yog cov hydrogen bins thiab cov entanglement ntawm molecular chains.
Cellulose Tsoos yog lub siab molecular hnyav polymer uas tuab feem ntau los ntawm kev ua haujlwm ntawm cov hlua roj molecular. Vim yog lub viscosity siab ntawm cov nqi qis, cov cuab yeej leveling tsis zoo, thiab nws cuam tshuam rau cov zaj zoo nkauj ntawm cov yeeb yaj kiab txheej. Ntawm tus nqi siab, lub viscosity yog tsawg, lub txaws tsis zoo ntawm txheej zaj duab xis tsis zoo, thiab tag nrho ntawm txheej zaj duab xis tsis zoo. Daim ntawv thov cov yam ntxwv ntawm HEC, xws li txhuam tiv, ua yeeb yaj kiab thiab cov menyuam muaj feem cuam tshuam, cuam tshuam ncaj qha rau kev xaiv cov thickener. Tsis tas li nws cov khoom ntws xws li leveling thiab sag tiv taus yog cuam tshuam ntau ntawm cov thickeners.
Hydrophobically hloov cellulose (HMIB) yog cov hlua khi ntawm hydleS (ntau pawg neeg ntev ntev Cov txheej no muaj cov viscosity siab dua ntawm cov qib siab thiab yog li muaj yeeb yaj kiab zoo dua. Xws li Natrosol ntxiv rau qib 330, 331, cellosize sg-100, bermocoll eHM-100. Nws cov nyhuv thickening yog piv rau cov cellulose ether thickeners loj dua molecular loj. Nws txhim kho cov viscosity thiab leveling ntawm ICI, thiab txo cov nro. Piv txwv li, lub nro ntawm HEC yog li ntawm 67 mn / m, thiab lub nro ntawm HMHEC yog 55 ~ 65 mn / m.
HMHEC muaj cov tshuaj tsuag zoo heev, tiv thaiv cov yam ntxwv, theem theem, zoo gloss thiab anti-xim. Nws yog dav siv thiab tsis muaj qhov tsis zoo rau kev ua yeeb yaj kiab ntawm cov xim zoo me me. Kev ua yeeb yaj kiab zoo-ua kev ua tau zoo thiab tiv thaiv xeb corrosion. Cov koom ua ke no ua ke thickerer ua haujlwm zoo dua nrog vinyl acetate copolymer copolymer thiab muaj cov uas sib xws nrog cov kev ua haujlwm thickeners, tab sis nrog cov qauv yooj yim.
Lub Sijhawm Post: Apr-25-2024