Kazhinji, mukugadzirwa kwehydroxypropyl methylcellulose, donje rakanatswa recellulose rinorapwa nealkali solution pa35-40°C kwehafu yeawa, rosvinwa, cellulose yopwanywa, uye yochengetwa zvakanaka pa35°C, kuitira kuti alkali fibers dzakawanikwa dzive neavhareji polymerized degree iri mukati mehuwandu hunodiwa. Isa alkali fiber mukettle ye etherification, wedzera propylene oxide nemethyl chloride, uye etherify pa50-80 ℃ kwemaawa mashanu kusvika pakumanikidzwa kwakanyanya kweinenge 1.8 MPa. Wobva wawedzera huwandu hwakakodzera hwehydrochloric acid ne oxalic acid mumvura inopisa pa90°C kuti usuke zvinhu kuti vhoriyamu iwedzere. Suka nemvura ne centrifuge. Geza kusvika yakamira, kana huwandu hwemvura muzvinhu zviri pasi pe60%, iomese nemhepo inopisa pa130°C kusvika pasi pe5%.
Alkalization: Donje rakanatswa nehupfu mushure mekuvhurwa rinowedzerwa muchinhu chisina kunyunguduka, uye rinoitwa nealkali nemvura yakapfava kuti riwedzere kristalo lattice yedonje rakanatswa, izvo zvinoita kuti mamorekuru e etherifying agent apinde uye zvinovandudza kufanana kwe etherification reaction. Alkali inoshandiswa mu alkaliization isimbi hydroxide kana organic base. Huwandu hwealkali hwakawedzerwa (nehukuru, hwakafanana pazasi) hwakapetwa ka0.1-0.6 kupfuura hwedonje rakanatswa, uye huwandu hwemvura yakapfava hwakapetwa ka0.3-1.0 kupfuura hwedonje rakanatswa; inert solvent musanganiswa wealcohol ne hydrocarbon, uye huwandu hweinert solvent hwakawedzerwa idonje rakanatswa. Ka7-15: inert solvent inogonawo kuva alcohol ine 3-5 carbon atoms (senge alcohol, propanol), acetone. Inogonawo kuva aliphatic hydrocarbons uye aromatic hydrocarbons; tembiricha inofanira kudzorwa mukati me 0-35°C panguva ye alkaliization; nguva ye alkaliization ingangoita awa imwe. Kugadziriswa kwekupisa nenguva kunogona kutsanangurwa zvichienderana nezvinodiwa nezvinhu uye chigadzirwa.
Kuisa ether: Mushure mekugadzirisa alkalizing, pasi pemamiriro e vacuum, etherification inoitwa nekuwedzera etherifying agent, uye etherifying agent ipropylene oxide. Kuti kuderedza kushandiswa kwe etherifying agent, etherifying agent yakawedzerwa kaviri panguva ye etherification.
Nguva yekutumira: Kubvumbi-28-2024