MC is methyl cellulose, iyo inogadzirwa ne cellulose ether nekurapa donje rakanatswa nealkali, uchishandisa methane chloride se etherification agent, uye kuburikidza neyakatevedzana maitiro. Kazhinji, dhigirii rekutsiva i1.6 ~ 2.0, uye kunyungudika kwakasiyanawo nemadhigirii akasiyana ekutsiva. Iyo ndeye isiri-ionic cellulose ether.
(1) Kuchengetwa kwemvura kwemethyl cellulose kunoenderana nehuwandu hwayo hwekuwedzera, viscosity, particle fineness uye dissolution rate. Kazhinji, kana huwandu hwekuwedzera hwakakura, hunyoro hudiki, uye viscosity yakakura, mwero wekuchengetedza mvura wakakwira. Pakati pavo, huwandu hwekuwedzera hune simba guru pahuwandu hwekuchengetedza mvura, uye chiyero che viscosity hachina kuenzana zvakananga nehuwandu hwekuchengetedza mvura. Mwero wekunyungudika unonyanya kuenderana nehuwandu hwekugadziriswa kwepasi kwe cellulose particles uye particle fineness. Pakati pema cellulose ethers ari pamusoro, methyl cellulose uye hydroxypropyl methyl cellulose vane mwero wepamusoro wekuchengetedza mvura.
(2) Methylcellulose inonyungudika mumvura inotonhora, uye zvichange zvakaoma kunyungudika mumvura inopisa. Mushonga wayo une aqueous wakanyatsogadzikana muhupamhi hwepH = 3 ~ 12. Iine kuwirirana kwakanaka ne starch, guar gum, nezvimwewo uye akawanda ma surfactants. Kana tembiricha inosvika tembiricha yegelation, gelation inoitika.
(3) Shanduko mutembiricha ichakanganisa zvakanyanya mwero wekuchengetedza mvura yemethyl cellulose. Kazhinji, kukwirisa tembiricha, kunowedzera kuchengetedzeka kwemvura. Kana tembiricha yevhu ichipfuura 40 ° C, kuchengetwa kwemvura kwemethyl cellulose kuchaderedzwa zvakanyanya, kunokanganisa zvakanyanya kuvakwa kwedhaka.
(4) Methyl cellulose ine mhedzisiro yakakosha pakuvaka uye kunamatira kwedhaka. “Kunamira” pano kunoreva simba rekunamira rinonzwikwa pakati pemudziyo wemudziyo wekushandisa nemadziro emadziro, ndiko kuti, kugerwa kwedhaka. Kunamatira kwakakwirira, kupikisa kweshear kwevhu kwakakura, uye simba rinodiwa nevashandi vari mukugadzirisa kushandiswa kwakakurawo, uye kushanda kwekuvaka kwedhaka kwakashata. Methyl cellulose adhesion iri pamwero wepakati mune cellulose ether zvigadzirwa.
HPMC inonzi hydroxypropyl methylcellulose, inova isiri-ionic cellulose yakasanganiswa ether yakagadzirwa kubva kudonje rakanatswa mushure me alkalization, uchishandisa propylene oxide uye methyl chloride se etherification agents, uye kuburikidza neakatevedzana maitiro. Dhigirii rekutsiva kazhinji 1.2 ~ 2.0. Zvimiro zvaro zvakasiyana nekuda kweiyo reshiyo yakasiyana yemethoxyl yemukati uye hydroxypropyl yemukati.
(1) Hydroxypropyl methylcellulose inonyungudika nyore nyore mumvura inotonhora, uye ichasangana nematambudziko mukunyungudika mumvura inopisa. Asi tembiricha yayo yegelation mumvura inopisa yakanyanya kukwirira kupfuura yemethyl cellulose. Iyo solubility mumvura inotonhora zvakare yakagadziridzwa zvakanyanya kana ichienzaniswa nemethyl cellulose.
(2) Iyo viscosity yehydroxypropyl methylcellulose inoenderana nehuremu hwayo hwemamorekuru, uye iyo yakakura huremu hwemamorekuru, ndiyo inokwirisa viscosity. Kupisa kunokanganisawo viscosity yayo, sezvo tembiricha inowedzera, viscosity inoderera. Nekudaro, iyo yakakwira viscosity ine yakaderera tembiricha mhedzisiro pane methyl cellulose. Mushonga waro wakagadzikana kana wakachengetwa pakushambidzika kwekamuri.
(3) Hydroxypropyl methylcellulose yakagadzikana kune asidhi uye alkali, uye mhinduro yayo yemvura yakanyatsogadzikana muhuwandu hwepH = 2 ~ 12. Caustic soda uye mvura yeraimu haina mhedzisiro pakuita kwayo, asi alkali inogona kukurumidzira kuparara kwayo uye kuwedzera viscosity yayo. Hydroxypropyl methylcellulose yakagadzikana kune yakajairwa munyu, asi kana kusanganiswa kwemunyu munyu kwakakwira, viscosity yehydroxypropyl methylcellulose mhinduro inowedzera kuwedzera.
(4) Kuchengetwa kwemvura yehydroxypropyl methylcellulose kunoenderana nehuwandu hwayo hwekuwedzera, viscosity, nezvimwewo, uye chiyero chekuchengetedza mvura pasi peiyo imwe yekuwedzera yakakwira kupfuura iyo yemethyl cellulose.
(5) Hydroxypropyl methylcellulose inogona kusanganiswa nemvura-soluble polymer compounds kuti iite yunifomu uye yakakwirira viscosity mhinduro. Zvakadai se polyvinyl doro, starch ether, muriwo gum, nezvimwe.
(6) Iko kunamatira kwehydroxypropyl methylcellulose kukuvaka kwedhaka kwakakwira kupfuura iyo yemethylcellulose.
(7) Hydroxypropyl methylcellulose ine nani enzyme kuramba kupfuura methylcellulose, uye mhinduro yayo haigone kuderedzwa nema enzymes kupfuura methylcellulose.
Nguva yekutumira: Kubvumbi-17-2023