Nzira yekugadzira cellulose ether?

Kugadzirwa kwema cellulose ethers kunosanganisira kushandura kemikari selulosi yechisikigo, kazhinji inotorwa kubva muhuni pulp kana donje, kuburikidza nenhevedzano yemakemikari maitiro. Mhando dzakawanda dzema cellulose ethers dzinosanganisira Methyl Cellulose (MC), Hydroxyethyl Cellulose (HEC), Hydroxypropyl Methyl Cellulose (HPMC), Carboxymethyl Cellulose (CMC), nevamwe. Maitiro chaiwo anogona kusiyana zvichibva pane chaiyo cellulose ether iri kugadzirwa, asi nhanho dzese dzakafanana. Heino mhedziso yakapfava:

General Matanho ekugadzira Cellulose Ethers:

1. Kunobva Cellulose:

• Chinhu chekutanga ndeye cellulose yechisikigo, kazhinji inowanikwa kubva muhuni pulp kana donje. Iyo cellulose inowanzo muchimiro cheyakacheneswa cellulose pulp.

2. Alkalization:

• Iyo cellulose inobatwa nemhinduro yealkaline, yakadai sesodium hydroxide (NaOH), kumisa mapoka ehydroxyl pacheni ye cellulose. Iyi alkalization nhanho yakakosha kune imwezve derivatization.

3. Etherification:

• Iyo alkalized cellulose inoiswa kune etherification, apo akasiyana ether mapoka anounzwa pane cellulose musana. Iyo chaiyo mhando yeboka reether rakaunzwa (methyl, hydroxyethyl, hydroxypropyl, carboxymethyl, nezvimwewo) zvinoenderana neinodiwa cellulose ether.
• Iyo etherification process inosanganisira kuita kwe cellulose nema reagents akakodzera, akadai se:
  • YeMethyl Cellulose (MC): Kurapa ne dimethyl sulfate kana methyl chloride.
  • YeHydroxyethyl Cellulose (HEC): Kurapa ne ethylene oxide.
  • YeHydroxypropyl Methyl Cellulose (HPMC): Kurapa nepropylene oxide uye methyl chloride.
  • YeCarboxymethyl Cellulose (CMC): Kurapa ne sodium chloroacetate.

4. Neutralization uye Washing:

• Mushure me etherification, chinobuda cellulose chinobva pachezvake chinowanzogadziriswa kubvisa chero alkali yasara. Chigadzirwa chacho chinobva chashambidzwa kubvisa tsvina uye ne-zvigadzirwa.

5. Kuomesa nekugaya:

• Iyo cellulose ether inoomeswa kuti ibvise hunyoro hwakawandisa uye yobva yagayiwa kuita hupfu hwakatsetseka. Iyo particle size inogona kudzorwa zvichienderana neyakagadzirirwa application.

6. Kudzora Hunhu:

• Chekupedzisira cellulose ether chigadzirwa chinoitwa bvunzo dzehutongi hwemhando kuti ive nechokwadi chekuti inosangana nezvakatsanangurwa, zvinosanganisira viscosity, hunyoro hwemukati, kugovera saizi yechikamu, uye zvimwe zvinhu zvine chekuita.

Izvo zvakakosha kuti uzive kuti kugadzirwa kwe cellulose ethers kunoitwa nevagadziri vakasarudzika vachishandisa inodzorwa maitiro. Mamiriro chaiwo, mareagents, uye midziyo inoshandiswa inogona kusiyana zvichienderana neinodiwa zvivakwa zve cellulose ether uye mashandisirwo akatarisirwa. Pamusoro pezvo, matanho ekuchengetedza akakosha panguva yekuchinja kwemakemikari maitiro.