Cellulose ether ikirasi yakakosha yemapolymer compounds, anoshandiswa zvakanyanya mukuvaka, mushonga, chikafu uye mamwe minda. Pakati pavo, HPMC (hydroxypropyl methylcellulose), MC (methylcellulose), HEC (hydroxyethyl cellulose) uye CMC (carboxymethyl cellulose) mana akajairika cellulose ethers.
Methyl cellulose (MC):
MC inonyungudika mumvura inotonhora uye yakaoma kunyungudika mumvura inopisa. Mushonga wemvura wakanyatsogadzikana muhupamhi hwepH = 3 ~ 12, ine kugarisana kwakanaka, uye inogona kusanganiswa nemhando dzakasiyana-siyana dze surfactants dzakadai se starch uye guar gum. Kana tembiricha inosvika tembiricha yegelation, gelation inoitika.
Kuchengetwa kwemvura kweMC kunoenderana nehuwandu hwayo hwekuwedzera, viscosity, particle fineness uye dissolution rate. Kazhinji, mwero wekuchengetedza mvura wakakwira kana huwandu hwekuwedzera hwakakura, zvimedu zvakanaka uye viscosity yakakwira. Pakati pavo, mari yekuwedzera ine simba guru pahuwandu hwekuchengetedza mvura, uye chiyero che viscosity hachina kuenzana nehuwandu hwekuchengetedza mvura. Mwero wekunyunguduka unonyanya kuenderana nedhigirii rekugadzirisa uye chidimbu chidiki che cellulose particles.
Kuchinja kwematembiricha kuchakanganisa zvakanyanya kuchengetwa kwemvura kweMC. Kazhinji, kukwirisa tembiricha, kunowedzera kuchengetedzeka kwemvura. Kana tembiricha yevhu ichipfuura 40 ° C, kuchengetwa kwemvura kweMC kuchaderedzwa zvakanyanya, kuchikanganisa zvakanyanya kuita kwekuvaka kwedhaka.
MC ine simba rakakura pakuita kwekuvaka uye kunamatira kwedhaka. Pano, "kunamatira" kunoreva kunamatira pakati pezvishandiso zvekuvaka zvemushandi uye substrate yemadziro, ndiko kuti, kushorwa kweshear kwedhaka. Iyo yakakura kunamatira, iyo yakakura kushorwa kweshear kwedhaka, iyo yakakura simba rinodiwa nemushandi panguva yekushandiswa, uye kusashanda zvakanaka kwekuvaka kwedhaka. Iko kunamatira kweMC kuri padanho repakati pakati peselulosi ether zvigadzirwa.
Hydroxypropyl methylcellulose (HPMC):
HPMC inonyungudika nyore mumvura, asi inogona kunetsa kunyungudika mumvura inopisa. Nekudaro, tembiricha yayo yegelation mumvura inopisa yakakwira zvakanyanya kupfuura iyo yeMC, uye kunyungudika kwayo mumvura inotonhora zvakare kuri nani pane iyo yeMC.
Iyo viscosity yeHPMC inoenderana nehuremu hwemamorekuru, uye viscosity yakakwira kana huremu hwemamorekuru hwakakura. Tembiricha inokanganisawo viscosity yayo, uye viscosity inodzikira sezvo tembiricha inowedzera, asi tembiricha iyo iyo viscosity inodzikira yakaderera pane yeMC. Mhinduro yaro yakagadzikana pakupisa kwekamuri.
Kuchengetwa kwemvura kweHPMC kunoenderana nehuwandu hwekuwedzera uye viscosity, nezvimwewo. Muyero wekuchengetedza mvura pamwero wakafanana wekuwedzera wakakwira kupfuura weMC.
HPMC yakagadzikana kune acids uye alkalis, uye mhinduro yayo ine aqueous yakagadzikana mu pH renji ye2 ~ 12. Caustic soda uye mvura yeraimu haina mhedzisiro pakuita kwayo, asi alkali inogona kukurumidza kunyungudika kwayo uye kuwedzera viscosity. HPMC yakagadzikana kune general salts, asi kana kusanganiswa kwemunyu munyu kwakakwira, viscosity yeHPMC mhinduro inowedzera kuwedzera.
HPMC inogona kusanganiswa nemvura-inonyungudika polymer komisheni kuita yunifomu, yakakwirira viscosity mhinduro, senge polyvinyl doro, starch ether, muriwo chingamu, nezvimwe.
HPMC ine nani kupikisa enzyme pane MC, uye mhinduro yayo hainyanyi kukanganiswa ne enzymatic degradation pane MC. HPMC ine nani kunamatira kune dhaka pane MC.
Hydroxyethyl cellulose (HEC):
HEC inonyungudika mumvura inotonhora uye yakaoma kunyungudika mumvura inopisa. Mhinduro yacho yakagadzikana pakupisa kwepamusoro uye haina gel properties. Inogona kushandiswa mudhaka kwenguva yakareba pakupisa kwepamusoro, asi kuchengetedza kwayo mvura kwakaderera pane MC.
HEC yakagadzikana kune general acids uye alkalis, alkali inogona kukurumidza kuparara kwayo uye zvishoma kuwedzera viscosity, uye dispersibility yayo mumvura zvishoma yakaderera kune MC uye HPMC.
HEC ine yakanaka kumiswa kuita kwedhaka, asi simende ine nguva yakareba yekudzosa.
HEC inogadzirwa nemamwe mabhizinesi epamba ine kuita kwakaderera pane MC nekuda kwehuwandu hwayo hwemvura uye madota.
Carboxymethyl cellulose (CMC):
CMC ionic cellulose ether inogadzirwa neakatevedzana ekuita marapirwo mushure mekunge mafizu echisikigo (sedonje) abatwa nealkali uye chloroacetic acid inoshandiswa se etherifying agent. Dhigirii rekutsiva kazhinji riri pakati pe0.4 ne1.4, uye kuita kwayo kunokanganiswa zvakanyanya nedhigirii rekutsiva.
CMC ine kukora uye emulsification kudzikamisa mhedzisiro, uye inogona kushandiswa muzvinwiwa zvine mafuta uye mapuroteni kuita emulsification kudzikamisa basa.
CMC ine simba rekuchengetedza mvura. Muzvigadzirwa zvenyama, chingwa, mabhanzi akabikwa uye zvimwe zvekudya, zvinogona kuita basa mukuvandudza matishu, uye zvinogona kuita kuti mvura isanyanya kushanduka, kuwedzera goho rechigadzirwa, uye kuwedzera kuravira.
CMC ine gelling mhedzisiro uye inogona kushandiswa kugadzira jelly uye jamu.
CMC inogona kugadzira firimu pamusoro pechikafu, icho chine chimwe chekudzivirira pamichero nemiriwo uye inowedzera hupenyu hwesherufu yemichero nemiriwo.
Aya cellulose ethers ega ega ane ega ega ega zvivakwa uye nzvimbo dzekushandisa. Kusarudzwa kwezvigadzirwa zvakakodzera kunoda kutariswa zvinoenderana nezvinodiwa zvekushandisa uye mamiriro ekunze.
Nguva yekutumira: Oct-29-2024