Yakanatswa donje-kuvhura-alkalization-etherification-neutralization-kuparadzanisa-kuwacha-kupatsanurwa-kuomesa-kupwanya-kuputira-yakapedza HPMC chigadzirwa kuvhura: Iyo yakanatswa donje inovhurwa kubvisa simbi yobva yapwanyika. Donje rakanatswa rakanatswa riri muchimiro chehupfu, chine saizi ye80 mesh uye transmittance ye100%. Zvikasadaro, zviri nyore kubatana pamwechete panguva yekuita maitiro uye kuderedza etherification kunyatsoita.
Alkalization: Wedzera donje rakanatswa mushure mekuvhurwa kwedonje kune inert solvent, uye woimisa nealkali nemvura yakapfava kuzvimba jira redonje rakanatswa kufambisa kupinda kwemamorekuru etherification agent uye kunatsiridza kufanana kwe etherification reaction. Iyo alkali inoshandiswa kuita alkalization isimbi hydroxide kana organic alkali. Nhamba yealkali yakawedzerwa (kuburikidza nehukuru, yakafanana pasi apa) ndeye 0.1-0.6 nguva yekotoni yakanatswa, chiyero chemvura yakapfava yakawedzerwa 0.3-1.0 nguva yekotoni yakanatswa; iyo inert solvent isanganiswa yedoro uye hydrocarbon, uye chiyero cheinert solvent chakawedzerwa 0.3-1.0 nguva yekotoni yakanatswa. 7 -15 nguva dzeiyo: The inert solvent inogonawo kuva doro rine 3-5 carbon atomu (sewaini, propanol), acetone. Inogonawo kuva aliphatic hydrocarbons uye anonhuwirira hydrocarbons; tembiricha inofanira kudzorwa mukati 0-35 ° C panguva alkalization; nguva ye alkalization inenge 1hr. Kugadziriswa kwekushisa uye nguva kunogona kutsanangurwa maererano nezvinhu uye zvigadzirwa zvinodiwa.
Etherification: Mushure mekurapa kwe alkalization, pasi pemamiriro ekutsvaira, etherification agent inowedzerwa kune etherification, uye etherification agent ipropylene oxide. Kuti uderedze kudyiwa kwe etherification agent, panguva ye etherification process, iyo etherification agent inowedzerwa mu kaviri, huwandu hwekutanga hwekuwedzera ndeye 1-3.5 nguva yedonje rakanatswa, uye huwandu hwese hwemaviri ekuwedzera ndeye 1.5. -4 nguva iyo yekotoni yakanatswa. nguva. Mushure mekuwedzera iyo etherifying agent kekutanga, simbisai pa ≤30 ° C ye45min-90min, wozosimudza tembiricha kusvika 50-100 ° C ye etherification ye 1-5h, wozotonhora kusvika ≤30 ° C, kechipiri. kuwedzera etherification inomutsa, inomutsa nguva ndeye 30-120min, uye wozopisa kune? ? ? Ita etherification, nguva iri 1-4h, panguva ino, donje rakanatswa rinopindirana zvizere ne etherification agent kugadzira hYDROXYPROPYL METHYLCELLULOSE HPMC.
Kupwanya uye kurongedza: kupwanya uye kusefa chigadzirwa chakaomeswa chekugadzirwa kwazvino, saizi yeHPMC yechigadzirwa chezvino kugadzirwa mushure mekupwanya uye kusefa ndeye makumi mana mesh uye transmittance ndeye 10096, kana zvinoenderana nezvinodiwa nemushandisi. Wobva warongedza HPMC.
Nguva yekutumira: Nov-24-2022