A:
MC is methyl cellulose: inonatswa donje mushure mekurapwa kwealkali, methane chloride senge etherifying agent, kuburikidza neakatevedzana maitiro ekugadzira cellulose ether.Kazhinji, dhigirii rekutsiva i1.6 ~ 2.0, uye kunyungudika kunosiyana nedanho rekutsiva.Ndeyanonionic cellulose ether.
(1) Kuchengetwa kwemvura kwemethyl cellulose kunoenderana nehuwandu hwayo hwekuwedzera, viscosity, particle fineness uye dissolution rate.Kazhinji wedzera huwandu hukuru, hunyoro hudiki, viscosity, mwero wekuchengetedza mvura wakakwira.Kuwanda kwekuwedzera kune simba guru pamusoro pehuwandu hwekuchengetedza mvura, uye viscosity haina kuenzana nehuwandu hwekuchengetedza mvura.Mwero wekunyunguduka unonyanya kuenderana nedhigirii rekugadzirisa uye chidimbu chidiki che cellulose particles.Mune ari pamusoro akati wandei cellulose ethers, methyl cellulose uye HPMC hydroxypropyl methyl cellulose mvura yekuchengeta mwero wakakwira.
(2) Methyl cellulose inonyungudika mumvura inotonhora, iyo yakaoma kunyungudika mumvura inopisa.Mhinduro yaro ine aqueous yakagadzikana mukati me pH = 3 ~ 12.Iine kuwirirana kwakanaka ne starch, guanidine chingamu uye akawanda ma surfactants.Gelation inoitika kana tembiricha yasvika tembiricha yegelation.
(3) Shanduko yekushisa ichakanganisa zvakanyanya mwero wekuchengetedza mvura yemethyl cellulose.Kazhinji, kukwirisa tembiricha, kunowedzera kuchengetedzeka kwemvura.Kana tembiricha yedhaka ichipfuura 40 ℃, kuchengetwa kwemvura kwemethyl cellulose kuchave kwakanyanya kuipa, izvo zvinokanganisa zvakanyanya kuvakwa kwedhaka.
(4) Methyl cellulose ine simba riri pachena pakuvaka uye kunamatira kwedhaka."Adhesion" pano inoreva kunamatira kunonzwikwa nemushandi pakati pechishandiso nemadziro substrate, ndiko kuti shear resistance yedhaka.Kunamatira kwakakura, kupikisa kweshear kwedhaka kwakakura, simba rinodiwa nevashandi mukugadzirisa kushandiswa kwakakurawo, uye kuvakwa kwedhaka kwakashata.Mune cellulose ether zvigadzirwa, kunamatira kwemethyl cellulose kuri pamwero wepakati.
HPMC ndeye hydroxypropyl methyl cellulose: inogadzirwa nedonje rakanatswa mushure mekurapa alkali, ine propylene oxide uye chloromethane se etherifying agent, kuburikidza neyakatevedzana maitiro uye yakagadzirwa neasiri-ionic cellulose yakasanganiswa ether.Dhigirii rekutsiva kazhinji 1.2 ~ 2.0.Zvimiro zvayo zvinosiyana nechikamu che methoxy uye hydroxypropyl zvemukati.
(1) HPMC hydroxypropyl methyl cellulose inonyungudika nyore nyore mumvura inotonhora, iyo yakaoma kunyungudika mumvura inopisa.Nekudaro, tembiricha yayo yegelation mumvura inopisa zviri pachena yakakwira kupfuura iyo yemethyl cellulose.Iyo solubility yemethyl cellulose mumvura inotonhora yakagadziridzwawo zvakanyanya.
(2) Iyo viscosity yeHPMC hydroxypropyl methyl cellulose inoenderana nehuremu hwayo hwemamorekuru, uye nekukwira kwehuremu hwemamorekuru, ndiko kukwirisa viscosity.Tembiricha inokanganisawo viscosity.Viscosity inoderera sezvo tembiricha inowedzera.Asi iyo viscosity yakakwirira tembiricha mhedzisiro yakaderera pane iyo yemethyl cellulose.Mushonga wacho wakagadzikana kana wakachengetwa pakushambidzika kwekamuri.
(3) HPMC hydroxypropyl methyl cellulose yakagadzikana kune asidhi uye chigadziko, uye mhinduro yayo ine aqueous yakagadzikana muhuwandu hwepH = 2 ~ 12.Caustic soda uye mvura yeraimu haina mhedzisiro pazvinhu zvayo, asi alkali inogona kukurumidza kunyungudika kwayo uye kuvandudza viscosity.HPMC hydroxypropyl methyl cellulose yakagadzikana kumunyu wakajairwa, asi kana huwandu hwemunyu munyu hwakwira, viscosity yeHPMC hydroxypropyl methyl cellulose mhinduro inowedzera kuwedzera.
(4) Kuchengetwa kwemvura kweHPMC hydroxypropyl methyl cellulose kunoenderana nedosi uye viscosity, uye mwero wekuchengetedza mvura weHPMC hydroxypropyl methyl cellulose wakakwira kupfuura wemethyl cellulose pachiyero chimwe chete.
(5) HPMC hydroxypropyl methyl cellulose inogona kusanganiswa nemvura-soluble polymer compounds kuti ive yunifomu, yakakwirira viscosity solution.Zvakadai se polyvinyl doro, starch ether, yemiriwo glue uye zvichingodaro.
(6) Kunamatira kweHPMC hydroxypropyl methyl cellulose kukuvaka dhaka kwakakwira kupfuura iyo yemethyl cellulose.
(7) HPMC hydroxypropyl methyl cellulose ine nani enzyme kuramba pane methyl cellulose, uye mhinduro yayo enzyme yekukanganisa mukana yakaderera pane iyo yemethyl cellulose.
Nguva yekutumira: May-26-2022