HydroxyPropy cellulose HPMC yog cov khoom siv ntawm ionic ntawm ethayl carboxymethyl cellulose cellulose sib xyaw nrog cov hlau hnyav. Ib tug pa radicals vim tias muaj cov ntsiab lus ntawm hydroxyropropyl thiab cov ntsiab lus ntawm cov kab mob me ntawm cov methylopyl ntau yam, nws cov kev ua tau zoo ntawm methyl cellulose thiab methoxyl Cov ntsiab lus thiab cov ntsiab lus siab ntawm hydroxypropyl ntau yam, thiab nws ua tau zoo yog ze rau hydroxyprropy cellulose tsim tawm. Tab sis nyob rau hauv txhua ntau yam, txawm hais tias tsuas muaj ib qho me me ntawm hydroxypropyl lossis me me ntawm methoxy, cov solubilation hauv organic kub, muaj qhov sib txawv.
1, HydroxyPropyyl methyl cellulose solubility
HydroxyPropy cellulose hauv dej solubility ntawm hydroxypropyl cellulose yog qhov ua tau zoo sib xws nrog cov dej me me (metyl oxyylropyl Txawm li cas los xij, cov gelation kub ntawm hloov hydroxy prantyl yog ntau dua li ntawm methyl cellulose hauv dej kub. Piv txwv li, lub viscosity ntawm hydroxypropylulose aquylcellulose cov kua nrog 2% methoxy cov ntsiab lus ds = 0.73 thiab hydroxypropyls MS = 0.46 yog 500 MPa ntawm 20 ℃. Lub gel kub ntawm s cov khoom yog ze li 100 ℃, thaum lub sij hawm methyl cellulose ntawm tib qho kub tsuas yog kwv yees li 55 ℃. Raws li rau nws solubility hauv dej, kuj tseem txhim kho, tom qab kev sib daj, grain) metly) me me (grain) me me) Cov.
(2) HydroxyPropyl cellulose hauv cov organic cov kuab tshuaj ntawm cov kab mob methhoxy DS = 0.2 ~ 1.0, siab viscosity HydroyPropyl cellulose nrog tag nrho cov kev hloov me me saud (ethanol daws, thiab muaj kev daws teeb meem thermopicastic thiab dej solubility. Nws tseem yog soluble hauv chlorinated hydrocarbons xws li Dichhloromethane thiab Trichloromethane thiab Trichlicolethane, thiab cov kuab tshuaj organic xws li haus cawv, yog cawv diacetone. Nws cov solubility hauv cov kuab tshuaj yeeb yaj kiab yog zoo dua rau dej solubility.
2, HydroxyPropyl methyl cellulose viscosity ntawm cov yam ntxwv
HydroxyPropyyl Metylcellulose viscosity factcosity HydroxyPropen Txheem MetherCosy Kev txiav txim siab, thiab lwm yam kev daws teeb meem a aque raws li kev txiav txim siab qauv. Lub viscosity ntawm tib qho khoom, nrog kev nce ntawm kev xav thiab nce ntxiv, qhov hnyav ntawm cov khoom lag luam hnyav molecular hnyav, hnyav hnyav ntawm cov khoom lag luam muaj viscosity siab. 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, lub viscosity dheev nce thiab gelation tshwm sim. Cov gelation kub ntawm cov khoom muaj cov viscosity qis yog siab dua li cov khoom uas muaj viscosity siab. Qib ntawm nws cov gel point, ntxiv rau qhov siab thiab qis methost, tab sis kuj nrog ethrot methoxy thiab tag nrho cov qib kev hloov pauv tau cuam tshuam. Nws yuav tsum raug sau tseg tias hydroxypropyl methylcelulose kuj yog pseudophistras; Nws cov kev daws teeb meem yog ruaj khov thaum khaws cia ntawm chav tsev kub thiab tsis qhia qhov kev tshwm sim ntawm viscosity tsuas yog rau qhov ua tau ntawm enzymatic degradation.
3, HydroxyPropyl methyl cellulose acid thiab alkaline Kuj
HydroxyPropyl meldcellulose Acid Alkali HydroxyPropylenose cov kua qaub, nws tuaj yeem tiv taus ib qho ntawm ph pH2), nws tuaj yeem tiv taus cov kua qaub, cov accet acid, succinic acid, phosphoric Acid, boric acid, thiab lwm yam tab sis cov accorrated acid muaj qhov cuam tshuam ntawm kev txo cov viscosity. Alkali xws li caustic dej qab zib, causul dej poov tshuaj thiab txiv qaub dej tsis muaj qhov cuam tshuam ntawm kev daws teeb meem me ntsis ntawm yav tom ntej.
4, HydroxyPropyyl methyl cellulose tuaj yeem sib xyaw
HydroxyPropyl methyl cellulose tshuaj tuaj yeem sib xyaw nrog dej-soluble polymer tebchaw, thiab dhau los ua kev sib xyaw ua ke nrog cov tshuaj tsis sib haum. Cov pob zeb siab loj yog polyethylene glycol, polyylicone, polymelyl lug ntawm cov pos hniav, pos ntoo ntoo ntawm cov pos hniav thiab lwm yam ntxiv rau nws daws. HydroxyPropy cellulose tuaj yeem sib xyaw nrog cov kua qaub staric lossis mannitol, cov tebcim no tuaj yeem siv los ua hydroxypropyl methyl cellulose yas.
5, HydroxyPropyyl methyl cellulose insoluble dej soluble
HydroxyPropy cellulose insoluble dej-soluble cellulose enchet-ether los nag, ua insoluble hauv dej. Thiab ua hydroxypropylulose insoluble aldehyde yuav tsum tau them nyiaj tshwj xeeb, yog li hauv kev lag luam ntau lawm siv glyoxal li tus ntoo khaub lig -ku tus neeg sawv cev. Qhov ntau npaum li cas ntawm hom kev sib txuam ntawm cov tshuaj tua kab mob hauv kev daws teeb meem yog 0.2% ~ 10% ~ 10%, xws li siv Glyoxal nrog 3.3% yog qhov tsim nyog tshaj plaws. Qhov kev kho siab dav dav yog 0 ~ 30 ℃, 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, inorganic cov kua qaub muaj zog lossis cov organic carboxylic acid tau ntxiv txog 2 ~ 6, thiab tom qab ntawd aldehydes tau ntxiv rau kev sib txuas sib txuas. Cov kua qaub siv yog hydrochloric acid, phosfuric acid, formic acid, accroet acid, scetic acid, scetic acid yog qhov zoo tshaj plaws, thaum cov formic acid yog qhov zoo tshaj plaws. Cov kua qaub thiab aldehydes kuj tseem yuav ntxiv rau tib lub sijhawm kom cia cov kev daws teeb meem yuav raug muab sib txuas nrog Ph Yeej xav tau. Qhov kev cuam tshuam no feem ntau yog siv nyob rau hauv cov txheej txheem kawg ntawm Cellulose ether cov txheej txheem, yog li ntawd cellule npaj, yooj yim siv 20 ~ 25 ℃ dej ntxhua thiab ntxuav. Thaum cov khoom siv tau siv, tshuaj alkaline tuaj yeem raug ntxiv rau kev daws teeb meem los kho cov pheeb suab los kho cov alkaline ua kom alkaline, thiab cov khoom tau sai sai nyob rau hauv kev daws. Hom no tseem tuaj yeem siv thaum cov tshuaj ayulose tau siv los ua ib zaj duab xis thiab ces zaj duab xis tau kho kom ua ib zaj duab xis insoluble.
6, HydroxyPropyl methyl cellulose los tiv thaiv enzyme
HydroxyPropyl methyl cellulose enzyme tsis kam ntawm cov pab pawg cellulgleglue xws li muaj cov khoom lag luam uas tiav lawm los hloov tus nqi ntau dua 1, Tsis tas li los ntawm enzyme degradation, qhov no yog qhov kev piav qhia ntawm txhua pawg hauv cov hmoov av tsis muaj qab zib, uas tuaj yeem nqus tau cov piam thaj, uas tuaj yeem nqus tau los ntawm cov kab mob me me los ntawm cov zaub mov. Yog li ntawd, yog tias ETetherification hloov chaw ntawm cellulose nce, qhov tsis kam ntawm cellulose ether rau enzymatic yaig yuav txhim kho. Nws tau tshaj tawm tias nyob rau hauv cov kev tswj hwm, cov khoom seem ntawm hydroxyprose cellulose (DS = 1.83), thiab hydroxyethyl cellulose (1.7%) yog 13,2%, 7.3% , 3.8%, thiab 1.7%, feem. HydroxyPropyyl methyl cellulose muaj zog anti-enzyme muaj peev xwm. Yog li hydroxypropyl methylulose zoo heev los tiv thaiv anti-enzyme, siv cov duab kos, siv rau hauv cov txheej txheem emulsion, thiab feem ntau tsis tas yuav ntxiv cov tshuaj tiv thaiv. Txawm li cas los xij, txhawm rau tiv thaiv kev daws teeb ntev lossis muaj peev xwm ntxiv tau, uas nws xaiv tau raws li cov kev daws teeb meem kawg. Phenyylmeric acetate thiab manganese fluosilicate muaj txiaj ntsig zoo, tab sis lawv yog tshuaj lom thiab yuav tsum ua tib zoo ua haujlwm. Feem ntau, 1 ~ 5mg phenylmuric acetate tuaj yeem ntxiv rau txhua litre daws.
7, HydroxyPropyfhoyl methyl cellulose memulose memule membrane kev ua tau zoo
HydroxyPropy cellulose zaj duab xis ntawm hydroxypropyl cellulose tau muaj cov yeeb yaj kiab zoo nkauj, tom qab ziab ua pob tshab thiab cov yeeb yaj kiab tawv. Nws muaj zoo noo noo tsis kam thiab tseem ruaj khov ntawm qhov kub. Xws li ntxiv ntawm hygroscopic plaster, tuaj yeem txhim kho nws txoj kev elongation thiab hloov pauv tau yooj yim, glycerol thiab lwm yam yas yas yog qhov tsim nyog tshaj plaws. Cov kev daws teeb meem dav dav yog 2% ~ 3%, cov yas yas roj hmab yog 10% ~ 20% ntawm cellulose ether. Yog hais tias cov ntsiab lus ntawm lub tshuab raj muaj neeg txaus siab, lub shrinkage tshwmpomenon ntawm lub cev qhuav dej tsis tuaj yeem tshwm sim hauv cov av noo. Lub zog tensile ntawm cov yeeb yaj kiab ntxiv planizer muaj ntau dua li uas tsis ntxiv, thiab nce ntxiv nrog kev nce ntawm cov yeeb yaj kiab tseem tau nce nrog qhov nce ntawm cov roj yas.
Lub sijhawm Post: Sep-08-2022