Hunhu hweHydroxypropyl Methyl Cellulose

Hydroxypropyl methylcellulose inonatswa kubva mudonje mushure me alkalization, ichishandisa propylene oxide uye methyl chloride se etherification agents, uye inopinda munhevedzano yemaitiro kuti ibudise isiri-ionic cellulose yakasanganiswa ether. Hydroxypropyl methylcellulose isiri-ionic cellulose ether, chena pakutaridzika, haina hwema uye isinganakidze. Chiyero chekutsiva kazhinji . Zvimiro zvayo zvinosiyana zvichienderana nereshiyo yemethoxyl yemukati kune hydroxypropyl yemukati.

Kutanga, tanga watarisa kuumbwa kwehydroxypropyl methylcellulose:

Iyo yakacheneswa donje cellulose inobatwa nealkali solution pa 35-40 ° C kwehafu yeawa, yakatsikirirwa, uye cellulose inoputika pa 35 ° C uye yakwegura zvakakodzera, kuitira kuti chiyero chepakati chepolymerization yeakawanikwa alkali fiber iri mukati me zvinodiwa range. Isa iyo alkali fiber muetherification tank, wedzera propylene oxide uye methyl chloride munhevedzano, etherify pa50-80 ° C kwemaawa mashanu, uye yakanyanya kudzvanywa ndeye approx. Wobva wawedzera huwandu hwakakodzera hwehydrochloric acid uye oxalic acid kumvura inopisa pa90 ° C kuti uwedzere huwandu. Dehydrate mu centrifuge. Kana hunyoro hwezvinhu hwadzikira kupfuura 60%, geza kuti usarerekera, wozoomesa kusvika pasi pe5% nemhepo inopisa pa130°C. Pakupedzisira wakapwanya nesefa ye20-mesh kuti uwane chigadzirwa chakapedzwa.

Zvigadzirwa zveHydroxypropyl Methyl Cellulose:

1. Hydroxypropyl methylcellulose inonyungudika nyore nyore mumvura inotonhora uye ichanyungudika mumvura inopisa. Nekudaro, tembiricha yayo yegelation mumvura inopisa yakanyanya kukwirira kupfuura iyo yemethylcellulose. Kunyungudika mumvura inotonhora zvakare yakagadziridzwa zvakanyanya pamusoro pemethyl cellulose.

2. Iyo viscosity ye hydroxypropyl methylcellulose inoenderana neiyo molecular uremu, uye viscosity yakakwirira kana molecular weight yakakura. Kupisa kunokanganisawo viscosity yayo, sezvo tembiricha inowedzera, viscosity inoderera. Asi viscosity yayo yakakwirira yakaderera pane methyl cellulose. Mhinduro yaro yakagadzikana pakupisa kwekamuri.

Iyo mvura yekuchengetedza simba yehydroxypropyl methylcellulose inoenderana nehuwandu hwayo hwekuwedzera, viscosity, nezvimwewo, uye chiyero chekuchengetedza mvura yakakwira kupfuura iyo yemethyl cellulose.

3. Hydroxypropyl methylcellulose yakagadzikana kune asidi uye alkali, uye mhinduro yayo yemvura inogadzikana muhuwandu hwepH = 2-12. Caustic soda uye mvura yeraimu haina mhedzisiro pazvinhu zvayo, asi alkali inogona kukurumidza kuparara kwayo uye kuwedzera zvishoma viscosity yayo. Hydroxypropyl methylcellulose yakagadzikana kune yakajairwa munyu, asi kana kusanganiswa kwemunyu munyu kwakakwira, viscosity yehydroxypropyl methylcellulose mhinduro inowedzera kuwedzera.

4. Hydroxypropyl methylcellulose inogona kusanganiswa nemvura-soluble polymers kuti iite yunifomu, high-viscosity solution. Zvakadai se polyvinyl doro, dziva remvura poda ether, muriwo gum, nezvimwe.

Hydroxypropyl methylcellulose ine nani enzyme kuramba pane methylcellulose, uye mhinduro yayo haine mukana wekuderedzwa enzymatic pane methylcellulose.

5. Kubatana pakati pehydroxypropyl methylcellulose uye chimiro chedhaka chakakwirira kudarika chemethylcellulose.

Iyo yakanyorova-yakasanganiswa dhaka simende, yakanaka aggregate, additives uye mvura, uye zvakasiyana-siyana zvinotemerwa zvinoenderana nekuita. Mushure mokunge kusanganiswa kuyerwa uye kusanganiswa pane imwe chiyero panzvimbo yekuvhenganisa, musanganiswa unoendeswa kunzvimbo inoshandiswa nerori inosanganiswa uye yakachengetwa mumudziyo unokosha, uye musanganiswa wemvura unoshandiswa mukati menguva yakatarwa.

Nzira yekutonga sei kunaka kwehydroxypropyl methylcellulose?

Kutarisa mhando yehydroxypropyl methylcellulose inonyanya kuenderana nezviratidzo zviviri, imwe idhigirii rekutsiva (DS) uye imwe kuchena. Kazhinji, zvimiro zvecarboxymethyl cellulose zvakasiyana kana dhigirii rekutsiva rakasiyana; iyo yakakwirira dhigirii yekutsiva, iyo yakasimba kunyungudika, uye zviri nani kuve pachena uye kugadzikana kwemhinduro. Zvinoenderana nemishumo yakakodzera, kujeka kwecarboxymethyl cellulose kwakanaka kana dhigirii rekutsiva riri ~, uye viscosity yemushonga wayo wemvura wakakwira kana pH kukosha iri 6-9. Izvi zvinoreva, kuyera kunaka kwecarboxymethyl cellulose, zvakakosha kuti uve nekunzwisisa kwakanaka kwedhigirii yayo yekutsiva uye kuchena. Izvi zviratidzo zviviri zvinosangana nezvinodiwa, izvo zvinoreva kuti hutano hwayo hwakanaka kwazvo.