MC inonzi methyl cellulose, inowanikwa nekurapa donje rakanatswa nealkali, uchishandisa methyl chloride sechinhu chinopisa, uye kugadzira cellulose ether kuburikidza neakatevedzana maitiro. Kazhinji, dhigirii rekutsiva i1.6 ~ 2.0, uye kunyungudika kwakasiyanawo nemadhigirii akasiyana ekutsiva. Ndeye-non-ionic cellulose ether.
(1) Kuchengetwa kwemvura kwemethyl cellulosezvinoenderana nehuwandu hwayo hwekuwedzera, viscosity, particle fineness uye dissolution rate. Kazhinji, kana huwandu hwekuwedzera hwakakura, hunyoro hudiki, uye viscosity yakakura, chiyero chekuchengetedza mvura chakakwirira. Pakati pavo, huwandu hwekuwedzera hune simba guru pamusoro pehuwandu hwekuchengetedza mvura, uye chiyero che viscosity hachina kuenzana nehuwandu hwekuchengetedza mvura. Mwero wekunyunguduka unonyanya kuenderana nehuwandu hwekugadziriswa kwepasi kwezvikamu zve cellulose uye kunaka kwezvimedu. Pakati pema cellulose ethers ari pamusoro, methyl cellulose uye hydroxypropyl methyl cellulose vane mwero wepamusoro wekuchengetedza mvura.
(2) Methylcellulose inonyungudika mumvura inotonhora, asi yakaoma kunyungudika mumvura inopisa, uye mhinduro yayo ine aqueous yakagadzikana muhuwandu hwepH = 3 ~ 12. Iine kuwirirana kwakanaka ne starch, guar gum, nezvimwewo uye akawanda ma surfactants. Kana kutonhora kunosvika pakupisa kwegelation, chiitiko chegelation chinoitika.
(3) Shanduko yekushisa ichakanganisa zvakanyanya mwero wekuchengetedza mvura yemethyl cellulose. Kazhinji, kukwirisa tembiricha, kunowedzera kuchengetedzeka kwemvura. Kana tembiricha yedhaka ichipfuura 40 ° C, kuchengetwa kwemvura kwemethyl cellulose kuchave kwakanyanya kuipa, izvo zvinokanganisa zvakanyanya kushanda kwedhaka.
(4) Methyl cellulose ine mhedzisiro yakakosha pakushanda uye kunamatira kwedhaka. “Kunamira” pano kunoreva kunamira kunonzwika pakati pemudziyo wemudziyo wekushandisa nemadziro emadziro, ndiko kuti, kushomeka kwekugera kwedhaka. Kusungirirwa kwakakura, kupikisa kweshear kwevhu kwakakura, uye simba rinodiwa nevashandi mukushandiswa kwekushandisa kwakakurawo, uye kuvakwa kwedhaka kwakashata. Methylcellulose adhesion iri pamwero wepakati mune cellulose ether zvigadzirwa.
HPMC inonzi hydroxypropyl methyl cellulose, inova isiri-ionic cellulose yakasanganiswa ether yakagadzirwa kubva kudonje rakanatswa mushure mekurapa alkali, uchishandisa propylene oxide uye methyl chloride se etherifying agents, uye kuburikidza neakatevedzana maitiro. Dhigirii rekutsiva kazhinji 1.2 kusvika 2.0. Zvimiro zvayo zvinosiyana zvichienderana nehuwandu hwemethoxyl yemukati uye hydroxypropyl yemukati.
(1) Hydroxypropyl methylcellulose inonyungudika nyore nyore mumvura inotonhora, asi ichasangana nematambudziko mukunyungudika mumvura inopisa. Asi tembiricha yayo yegelation mumvura inopisa yakanyanya kukwirira kupfuura yemethyl cellulose. Kunyungudika mumvura inotonhora zvakare yakavandudzwa zvakanyanya kana ichienzaniswa nemethyl cellulose.
(2) Iyo viscosity yehydroxypropyl methylcellulose inoenderana nehukuru hwehuremu hwayo, uye iyo yakakura huremu hwemamorekuru, inokwirisa viscosity. Kupisa kunokanganisawo viscosity yayo, sezvo tembiricha inowedzera, viscosity inoderera. Asi viscosity yayo haina kukanganiswa nekupisa kwakanyanya kupfuura methyl cellulose. Sarudzo yaro yakagadzikana pakuchengetedza pane tembiricha yekamuri.
(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. Hydroxypropyl methylcellulose yakagadzikana kune yakajairwa munyu, asi kana kusanganiswa kwemunyu munyu kwakakwira, viscosity yehydroxypropyl methylcellulose mhinduro inowedzera kuwedzera.
(4) Kuchengetwa kwemvura kwehydroxypropyl methylcellulosezvinoenderana nehuwandu hwayo hwekuwedzera, viscosity, nezvimwewo. Muyero wekuchengetedza mvura pasi pehuwandu hwekuwedzera hunopfuura hwemethyl cellulose.
(5) Hydroxypropyl methylcellulose inogona kusanganiswa nemvura-soluble polymer compounds kuita mhinduro ine yunifomu uye yakakwirira viscosity. Zvakadai se polyvinyl doro, starch ether, muriwo gum, nezvimwe.
(6) Iko kunamatira kwehydroxypropyl methylcellulose kukuvaka kwedhaka kwakakwira kupfuura iyo yemethylcellulose.
(7) Hydroxypropyl methylcellulose ine kuramba iri nani kune enzymes kupfuura methylcellulose, uye mhinduro yayo enzymatic degradation mukana yakaderera pane iyo yemethylcellulose.
Nguva yekutumira: Kubvumbi-28-2024