Cellulose Ether

Cellulose etherinogadzirwa kubva ku cellulose kuburikidza ne etherification reaction yeimwe kana akati wandei etherification agents uye yakaoma kugaya. Zvinoenderana neakasiyana maumbirwo emakemikari eether substituents, cellulose ethers inogona kukamurwa kuita anionic, cationic uye nonionic ethers. Ionic cellulose ethers inonyanya kusanganisiraCarboxymethyl cellulose ether (CMC); asiri-ionic cellulose ethers anonyanya kusanganisiramethyl cellulose ether (MC),hydroxypropyl methyl cellulose ether (HPMC)uye hydroxyethyl cellulose ether.Chlorine ether (HC)zvichingoenda zvakadaro. Non-ionic ethers yakakamurwa kuva ether-soluble ethers uye ether-soluble ethers, uye kwete-ionic mvura-soluble ethers inonyanya kushandiswa muzvigadzirwa zvematope. Muhupo hwe calcium ions, ionic cellulose ether haina kugadzikana, saka haisati yashandiswa mumiti yakaoma-yakavhenganiswa inoshandisa simenti, slaked lime, nezvimwewo sezvinhu zvekusimbisa. Nonionic mvura-soluble cellulose ethers inoshandiswa zvakanyanya muindasitiri yezvivakwa zvekuvaka nekuda kwekumira kwavo kugadzikana uye kuchengetedza mvura.

Chemical Properties yeCellulose Ether

Imwe neimwe cellulose ether ine hwaro hwechimiro che cellulose -Anhydroglucose chimiro. Mukugadzira cellulose ether, iyo cellulose fiber inotanga kupiswa muine alkaline solution, yozobatwa ne etherifying agent. Iyo fibrous reaction product inocheneswa nekupushwa kuita hupfu hwakafanana nehumwe hunyoro.

Mukugadzirwa kweMC, chete methyl chloride inoshandiswa se etherification agent; kunze kwemethyl chloride, propylene oxide inoshandiswawo kuwana hydroxypropyl substituent mapoka mukugadzirwa kweHPMC. Akasiyana-siyana cellulose ether ane akasiyana methyl uye hydroxypropyl substitution ratios, izvo zvinokanganisa kugarisana kwe organic uye tembiricha yegelation ye cellulose ether mhinduro.


Nguva yekutumira: Kubvumbi-25-2024