HydroxyPropyyl methylulose yog ib hom ntawm cov tsis-ionic cellulose sib xyaw ether. Tsis zoo li ionic methyl carboxymethyl cellulose sib xyaw ether, nws tsis hnov zoo nrog cov hlau hnyav. Vim muaj cov ntsiab lus sib txawv ntawm methoxyl cov ntsiab lus hauv hydroxyprropylulose thiab tsawg ntau yam kev ua tau zoo, muaj ntau yam kev ua tau zoo, muaj ntau yam kev sib txawv nrog methyl cellulose, thaum ntawd tsawg Cov ntsiab lus methoxyl thiab cov ntsiab lus hydroxypropyl yog ze rau ntawd hydroxypropyl metheny cellulose. Txawm li cas los xij, nyob rau hauv txhua ntau yam, txawm tsuas yog me me ntawm hydroxypropyl pawg lossis muaj ntau yam ntawm methoxyl pab pawg los yog flocculation nyob rau hauv aqueous daws.
(1) cov khoom siv solubility ntawm hydroxypropyf methylcellulose
①solubility ntawm hydroxypropylulose hauv dej hydroxyprose hloov los ntawm methylene oxide (metylcellen Txawm li cas los xij, vim hloov kho hydroxypropylropyl pab pawg, nws gelation kub hauv dej kub yog ntau dua li ntawm methyl cellulose. Piv txwv, lub viscosity ntawm hydroxypropylulose ahocessly kua txiv nrog 2% thiab kub thiab txias thiab kub thiab txias thiab kub thiab txias Methyl cellulose nyob rau tib qhov kub tsuas yog kwv yees li 55 ° C. Raws li rau nws solubility hauv dej, nws kuj tau txhim kho zoo heev. Piv txwv li, lub pulverized hydroxypropyl methylpeculose (granular duab 0.2 ~ 0.5 hli ntawm 20 °
②solubility ntawm hydroxypropyf methylulose hauv cov kuab tshuaj ntawm solubents ntawm solubility ntawm hydrotic cov kuab tshuaj kuj tseem zoo dua li methylcellulose. Rau cov khoom saum 2.1, siab-viscosity Holroxyprropylulose muaj cov lej me me Cov. Nws tseem yog soluble hauv chlorinated hydrocarbons xws li Methylene chloride thiab chocicform, thiab cov kuab tshuaj organic xws li tshuaj acetone, isopropanol thiab diacetone cawv. Nws cov solubility hauv cov kuab tshuaj yeeb yaj yog zoo dua li cov dej solubility.
(2) Qhov cuam tshuam rau cov viscrot ntawm hydroxyprcosylulose cov qauv visculphulose yog tib yam li kev ua haujlwm ntawm Hydroxelles yog tib yam li kev ua haujlwm ntawm lub cev ntawm 2 ° C nrog 2% kev daws teeb meem li tus qauv. Lub viscosity ntawm tib qho khoom nce nrog kev nce ntawm kev xav tau. Rau cov khoom lag luam zoo li hnyav ntawm qhov hnyav sib txawv ntawm qhov sib txawv, cov khoom lag luam nrog lub cev hnyav dua muaj qhov txawv txav. Nws txoj kev sib raug zoo nrog qhov kub zoo ib yam li methyl cellulose. Thaum qhov kub nce, lub viscosity pib txo qis, tab sis thaum nws mus txog ib qho kub thiab txias, lub dav hlau dheev nce thiab gelation tshwm sim. Lub gel kub ntawm cov khoom lag luam tsawg-viscosity yog siab dua. yog siab. Nws cov gel point tsis tsuas yog cuam tshuam nrog cov viscosity ntawm ether, tab sis kuj tseem muaj feem ntawm methoxyl pawg thiab hydroxypropropyl hauv ether thiab qhov loj ntawm kev hloov pauv tau ntev. Nws yuav tsum raug sau tseg tias hydroxypropylulose kuj tseem yog pseudopcastic, thiab nws cov kev daws teeb meem nyob rau hauv chav sov tsis muaj kev cuam tshuam hauv viscosity tsuas yog rau qhov ua tau ntawm enzymatic degradation.
(3) Kev ua kom ntev ntawm hydroxypropylulose txij li hydroxeller methylenculose yog cov neeg tsis muaj ionic, nws tsis ioniccenpulose cellulose reacts nrog cov hlau hnyav thiab precipitates hauv kev daws. Cov ntsev dav dav xws li chloride, bromide, phosphate, nitrate, thiab lwm yam. Txawm li cas los xij, qhov sib ntxiv ntawm ntsev muaj qee cov cawv ntawm cov flocculation kub ntawm nws cov aqueevous kev daws teeb meem. Thaum cov ntsev ua kom nce, qhov kub kub txo qis. Thaum cov ntsev ntau hauv qab yog hauv qab flocculation taw, lub viscosity ntawm kev daws teeb meem yuav nce. Yog li ntawd, ib qho nyiaj ntsev ntxiv. , hauv daim ntawv thov, nws tuaj yeem ua tiav cov nyhuv tuab dua kev lag luam. Yog li ntawd, hauv qee cov ntawv thov, nws yog qhov zoo dua los siv kev sib xyaw ntawm cellulose ether thiab ntsev tshaj qhov kev sib txuam ntawm ether daws kom ua tiav cov nyhuv ickening.
(4) HydroxyPropyyl methylulose acid thiab alkali ua rau hydroxypropylulose feem ntau ruaj khov rau cov acids thiab alkalis, thiab tsis cuam tshuam dab tsi hauv cov ph 2 ~ 12. Nws tuaj yeem tiv thaiv ib qho kev ntsuas lub teeb, xws li cov acid acid, decic acid, boric acid, boric acid, etc. Tab sis acculated acid muaj cov txiaj ntsig ntawm kev txo cov viscosity. Alkalis xws li Caustic dej qab zib, feustic dej thiab kua qaub tsis muaj kev cuam tshuam rau nws, tab sis lawv tuaj yeem nce kev daws teeb meem me ntsis ntawm kev daws teeb meem, thiab maj mam txo nws.
(5) Kev sib xyaw ntawm hydroxypropyl methylropylulose hydroxelly colthylrother polymer sib xyaw ua ke nrog cov khoom siv tsis zoo thiab cov pob tshab nrog cov viscosity ntau dua. Cov duab no polymer suav nrog polyethylene glycol, polyvinyl acetate, polysilicone, polymethylvinane, hydroxyethyl cellulose, thiab methyl cellulose. Ntuj siab molecular sib txuas xws li cov pos hniav Arabic, Karaya Gas hniav, thiab lwm yam kuj muaj kev sib raug zoo nrog nws txoj kev daws teeb meem. HydroxyPropyyl methylcellulose kuj tseem tuaj yeem sib xyaw nrog mannitol ester lossis matnitol thiab cov tebcim no tuaj yeem siv los ua hydroxyprropylulose tshuab cellulose rau cellulose.
(6) Insoluble dej-soluble cellulose kev ua neeg tau muaj kev hais ua ke nrog aldehydes tau txais kev pab cuam sab nrauv. Lub aldehydes uas ua hydroxypropylululose insoluble suav nrog formaldehyde, Tus neeg saib xyuas hauv kev lag luam ntau lawm. Tus nqi ntawm cov hom kev sib txuas no sib txuas hauv kev daws teeb meem yog 0.2% ~ 10% ~ 10% ~ 6% ntawm glyoxal yog qhov haum tshaj plaws. Feem ntau, kev kho ntsuas kub yog 0 ~ 30 ℃, thiab lub sijhawm yog 1 ~ 120min. Cov tshuaj tiv thaiv kev sib txuas hla kev xav tau yuav tsum tau ua raws li cov acidic. Feem ntau, cov tshuaj yog thawj zaug ntxiv nrog inorganic cov kua qaub los kho cov kuab tshuaj kom haum li 2 ~ 6, thiab tom qab ntawd ntxiv aldehydes los nqa cov tshuaj tiv thaiv kab ke sib txuas. Cov kua qaub muaj hydrochloric acid, phosphoric acid, formic acid, acc. scetic acid, acc.om acid yog qhov zoo, thiab formic acid yog qhov zoo. Cov kua qaub thiab aldehyde tseem tuaj yeem ntxiv ib txhij los cia cov kev daws teeb meem kom yauv hla cov tshuaj tiv thaiv hla dhau ntawm cov photrirer. Qhov kev cuam tshuam no feem ntau siv nyob rau hauv cov txheej txheem kev kho xwm txheej kawg hauv kev npaj npaj ntawm cellulose muaj kev hais ua neeg muaj kev hais ua. Tom qab lub cellulose ether yog insoluble, nws yog qhov yooj yim siv
20 ~ 25 ℃ Dej rau kev ntxuav thiab ua kom huv. Thaum cov khoom siv tau siv, tshuaj yeeb dej caw tau ntxiv rau kev daws ntawm cov tshuaj los kho cov tshuaj phkaline ua kom alkaline, thiab cov khoom yuav yaj tawm hauv cov kev daws teeb meem sai. Hom no tseem siv tau rau kev kho cov yeeb yaj kiab tom qab lub cellulose muaj kev daws teeb meem ua rau nws ua yeeb yaj kiab insoluble.
(7) enzyme tsis kam ntawm hydroxypropylulose hauv pab pawg, yog qhov tseeb, thaum cov khoom lag luam tsis zoo tshaj 1, nws yuav kuj yog degraded los ntawm enzymes, uas txhais tau tias kev kawm qib ntawm txhua pawg ntawm txhua pawg ntawm cov pab pawg cellule, thiab cov kab mob cellulgan tsis zoo, thiab cov kab mob cellulgan tsis muaj peev xwm zuj zus ntawm cov pab pawg tsis muaj peev xwm. Qab zib yog tsim thiab nqus tau li cov as-ham rau cov microorganisms. Yog li ntawd, yog tias qib ntawm etherical hloov chaw ntawm cellulose nce, qhov tsis kam mus rau enzymatic yaig ether yuav tseem nce ntxiv. Raws li cov lus tshaj tawm, nyob rau hauv cov kev tswj hwm, cov kev siv hydrocessy ntawm hydroxyprosylulose (DS = 1.83) yog 7.3%, Methylcellulose (DS = 1.66) yog 3.8%, thiab hydroxyethyl cellulose yog 1.7%. Nws tuaj yeem pom tau tias hydroxypropy kas methylcellose muaj lub zog tiv thaiv enzyme muaj peev xwm. Yog li ntawd, cov enzyme tsis kam ntawm hydroxypropylulose, ua ke nrog nws cov khoom siv zoo thiab ua yeeb yaj kiab, thiab feem ntau tsis tas yuav ntxiv cov tshuaj tiv thaiv. Txawm li cas los xij, rau lub sijhawm ntev cia ntawm kev daws teeb meem los yog cov tshuaj tiv thaiv tuaj yeem ntxiv ua qhov kev txiav txim siab, thiab cov kev xaiv tuaj yeem raug txiav txim siab raws li cov kev daws teeb meem kawg. Penyylmercuric acetate thiab manganese fluorosilicate muaj txiaj ntsig zoo, tab sis lawv txhua tus muaj tshuaj lom, kev saib xyuas rau kev ua haujlwm. Feem ntau, 1 ~ 5mg ntawm penyylmercury acetate tuaj yeem muab ntxiv rau kev daws rau ib liter ntawm cov pest.
(8) Kev ua yeeb yam ntawm hydroxypropyl methylcellose zaj duab xis hydroxypropylencellulose muaj cov yeeb yaj kiab zoo heev. Nws cov kua aqueous lossis organic kuab tshuaj tov yog coated ntawm lub khob iav, thiab nws ua pub dawb tom qab ziab. Xim, pob tshab thiab cov zaj duab xis tawv. Nws muaj zoo noo noo tsis kam thiab tseem ruaj khov ntawm qhov kub. Yog hygroscopic yas yog ntxiv rau, nws elongation thiab yoog tau tuaj yeem txhim kho. Nyob rau hauv cov nqe lus ntawm kev txhim kho hloov tau, cov yas xws li glycerol yog qhov haum tshaj plaws. Feem ntau, cov kev daws teeb meem yog 2% ~ 3%, thiab tus nqi ntawm cov yas muaj 10% ~ 20% ntawm cellulose ether. Yog tias cov ntsiab lus ntawm cov yas cua muaj siab dhau, colloid lub cev qhuav dej yuav tshwm sim ntawm cov av noo siab. Lub zog tensile ntawm zaj yeeb yaj kiab nrog cov yas ua kom loj dua li tias tsis muaj lub tshuab yas, thiab nws nce nrog kev nce ntxiv tus nqi ntxiv. Raws li rau cov kev hygroscopicity ntawm zaj duab xis, nws kuj nce nrog kev nce ntawm cov roj yasizer.
Lub Sijhawm Post: Dec-20-2022