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 hydroxyl cov ntsiab lus nyob ze rau ntawm hydroxyprropy 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
① solubility ntawm hydroxypropylulose hauv dej hydroylcenchylulose hloov los ntawm methylcelles hloov los ntawm methylcelles hloov los ntawm cov dej me me uas muaj cov dej so thiab dej kub instolubility. 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 li, lub viscosity ntawm hydroxypropylulose ahocessly aqueous aqueous kua txiv nrog 2 ° C, thiab hydroyl 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, tus pulverized hydroxypropy metylropen (granular duab 0.2 ~ 0.5 hli ntawm 20 °
② solubility ntawm hydroxypropylulcelulose hauv cov txheej txheem organic ntawm solubents ntawm hydrocypropcellulose hauv cov kuab tshuaj muaj metyloples kuj zoo dua li ntawm methylcellulose. Methylcellulose yuav tsum muaj tshuaj methoxyl hloov pauv ntawm 2.1 Cov khoom lag luam saum toj no, tab sis met-viscosylropyling nrog tag nrho cov kev hloov methanol thiab ethanol daws, thiab muaj thermos-yas thiab dej solubility. 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 xwm txheej cuam tshuam txog cov viscosity ntawm hydroxypropyl cellulose cov qauv vencosity txiav txim siab ntawm hydroxyprropyl cellulose yog tib yam li ntawm lwm yam ntawm lwm yam uas muaj kev hais ua cellulose. Nws raug ntsuas ntawm 20 ° C nrog 2% kev daws teeb meem raws li tus qauv. Lub viscosity ntawm tib qho khoom nce nrog kev nce ntawm kev xav. 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 poob, tab sis thaum nws mus txog ib qho kub thiab txias 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 pseudopcasty, thiab nws cov kev daws teeb meem yog ruaj khov ntawm chav viscosity tsuas yog rau kev ua rau enzymatic degradation.
(3) Kev ua kom ntev ntawm hydroxypropylulose txij li hydroxelllose yog ib qho kev daws teeb meem yog ib qho kev daws teeb meem, hauv kev daws teeb meem kom hnov mob ions thiab precipitate. 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 qee qhov nyiaj ntawm lub teeb roj acid, xws li formic acid, cov acidinic acid, boric acid, etc. 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 tsis paub txog ntawm HydroxyPropylulose HydroxellLose kev tshuaj tuaj yeem sib xyaw ua ke nrog cov khoom sib xyaw ua ke nrog cov tshuaj sib xyaw ua ke thiab cov khoom siv hluav taws xob nrog cov viscosity ntau dua. Cov duab no polymer suav nrog polyethylene glycol, polyvinyl acetate, polysilicone, polymethylvinyl 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) Cov dej hauv insolule-soluble cellulose muaj kev hais txog ntawm hydroxypropylulose nrog aldehydes yog precipitated nyob rau hauv kev daws teeb meem thiab ua insoluble hauv dej. Lub aldehydes uas ua hydroxypropyluluchlulose insoluble suav nrog formaldehyde, Qhov ntau npaum li cas ntawm no hom ntawm cov neeg sawv cev hla mus rau hauv kev daws teeb meem yog 0.2% ~ 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 kev cuam tshuam hla kev xav tau yuav tsum tau nqa tawm hauv qab cov duab acidic. Feem ntau, cov kev daws teeb meem yog hloov kho kom txog 2 ~ 6 los ntawm kev ntxiv cov tshuaj muaj zog acidganic, nyiam dua ntawm 4 ~ 6, thiab tom qab ntawd aldehydes tau ntxiv los ua cov kev tawm tsam nqa tawm. Cov kua qaub muaj hydrochloric acid, cov kua qaub phosphoric acid, acidic acid, accuminy acid, formic 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) Lub enzyme tsis kam ntawm hydroxypropylulose yog theoretically celluluced pab pawg, nws tseem yog qhov muaj txiaj ntsig zoo tshaj li 1, nws tseem yuav ua tiav cov khoom noj muaj txiaj ntsig, nws tseem yog tus muaj txiaj ntsig zoo dua li 1, nws tseem yog tus muaj txiaj ntsig zoo tshaj li 1, nws tseem yog tus muaj txiaj ntsig zoo dua li 1 Txhua pab pawg ntawm lub cellulose saw tsis muaj kev sib xws txaus, thiab cov kab mob me tau zuj zus ntawm cov muaj suab thaj, uas yog cov as-ham rau cov microorganism los nqus tau. 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 hydrocosy ntawm hydroxyrescellulose (DS = 1.83) 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 pob tshab thiab pob tshab tom qab kom qhuav. Thiab tawv zaj duab xis. 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 sij hawm Post: Jun-13-2023