Hydroxyethyl cellulose (HEC) isiri-ionic cellulose ether inoshandiswa zvakanyanya mukuvaka, machira, petroleum, makemikari ezuva nezuva uye mamwe minda. Iyo ine yakanaka thickening, kuturika, kupararira, emulsification, film-forming, inodzivirira colloid uye zvimwe zvinhu, uye yakakosha thickener uye stabilizer.
1. Kugadzirira kwezvinhu zvakasvibiswa
Iyo huru mbishi ye hydroxyethyl cellulose ndeye yakasikwa cellulose. Cellulose inowanzotorwa kubva muhuni, donje kana zvimwe zvinomera. Iyo yekubvisa maitiro e cellulose iri nyore, asi inoda kuchena kwepamusoro kuve nechokwadi chekuita kwechigadzirwa chekupedzisira. Nokuda kwechikonzero ichi, nzira dzemakemikari kana dzemagetsi dzinowanzoshandiswa kutangira-kurapa cellulose, kusanganisira defatting, de-impurity, bleaching uye mamwe matanho ekubvisa tsvina uye kwete-cellulose zvikamu.
2. Alkalization kurapwa
Alkalization kurapwa inhanho yakakosha mukugadzirwa kwehydroxyethyl cellulose. Chinangwa cheichi nhanho ndechekumisa iyo hydroxyl boka (-OH) pane cellulose molecular chain kufambisa inotevera etherification reaction. Sodium hydroxide (NaOH) solution inowanzo shandiswa sealkalizing agent. Iyo chaiyo maitiro ndeye: sanganisa cellulose ne sodium hydroxide mhinduro yekuzvimba zvizere uye kuparadzira cellulose pasi pemamiriro ealkaline. Panguva ino, mapoka e-hydroxyl pamamorekuru e-cellulose anowedzera kushanda, achigadzirira iyo inotevera etherification reaction.
3. Etherification reaction
Etherification reaction ndiyo nhanho yakakosha mukugadzirwa kwehydroxyethyl cellulose. Iyi nzira ndeyekuunza ethylene oxide (inozivikanwawo se ethylene oxide) kune cellulose mushure mekurapa alkalinization, uye kuita nemapoka ehydroxyl mumamorekuru ecellulose kugadzira hydroxyethyl cellulose. Mhedzisiro yacho inowanzoitwa mune yakavharwa reactor, tembiricha yekupindura inowanzodzorwa pa50-100 ° C, uye nguva yekuita inotangira kubva maawa akati wandei kusvika anopfuura gumi maawa. Chigadzirwa chekupedzisira chemhinduro ndeye chikamu chehydroxyethylated cellulose ether.
4. Neutralization uye kugeza
Mushure mokunge maitiro etherification apera, zvinogadzirisa zvinowanzova nehuwandu hwehuwandu hwealkali uye ne-zvigadzirwa. Kuti uwane yakachena hydroxyethyl cellulose chigadzirwa, neutralization uye kugeza kurapwa kunofanira kuitwa. Kazhinji, dilute asidhi (senge dilute hydrochloric acid) inoshandiswa kuderedza yakasara alkali mukuita, uye zvino reactants zvinoramba zvichigezwa nemvura yakawanda kubvisa tsvina inonyungudika nemvura uye ne-zvigadzirwa. Iyo yakagezwa hydroxyethyl cellulose iripo muchimiro chemvura yekusefa keke.
5. Kupera mvura uye Kuomesa
Iyo keke yakanyorova mushure mekugezwa ine mvura yakawanda uye inoda kushambidzwa uye yakaomeswa kuti iwane poda hydroxyethyl cellulose chigadzirwa. Kupera kwemvura kunowanzoitwa ne vacuum filtration kana centrifugal separation kubvisa yakawanda yemvura. Zvadaro, keke rakanyorova rinotumirwa kune midziyo yekuomeswa yekuomeswa. Midziyo yekuomesa yakajairika inosanganisira madhiramu anoomesa, flash dryer uye sprayer dryer. Iyo tembiricha yekuomesa inowanzo dzorwa pa60-120 ℃ kudzivirira yakawandisa tembiricha kubva pakukonzera chigadzirwa denaturation kana kukanganisa kwekuita.
6. Kukuya uye Kuongorora
Iyo yakaomeswa hydroxyethyl cellulose inowanzova yakakura block kana granular zvinhu. Kuti zvive nyore kushandisa uye kuvandudza kupararira kwechigadzirwa, inoda pasi uye kuongororwa. Kukuya kunowanzo shandisa grinder yekukuya mabhuroko makuru ezvinhu kuita hupfu hwakatsetseka. Kuongorora ndeyekuparadzanisa zvidimbu zvakakasharara zvisingasviki pakukura kwechidimbu chinodiwa muhupfu hwakatsetseka kuburikidza nemasikirini ane maburi akasiyana-siyana kuti ave nechokwadi chekunaka kwakafanana kwechigadzirwa chekupedzisira.
7. Product Packaging uye Storage
Iyo hydroxyethyl cellulose chigadzirwa mushure mekugaya uye kuongorora ine imwe fluidity uye dispersibility, iyo yakakodzera kushandiswa kwakananga kana kuenderera mberi kugadzirisa. Chigadzirwa chekupedzisira chinoda kurongedzerwa uye kuchengetwa kudzivirira hunyoro, kusvibiswa kana oxidation panguva yekufambisa nekuchengetedza. Hunyoro-uchapupu uye anti-oxidation yekurongedza zvinhu zvakaita sealuminium foil mabhegi kana akawanda-layer composite mabhegi anowanzo shandiswa kurongedza. Mushure mekurongedza, chigadzirwa chinofanira kuchengetwa munzvimbo inotonhorera uye yakaoma, kudzivirira zuva rakananga uye tembiricha yepamusoro uye yakakwirira humidity mamiriro kuti ive nechokwadi chekuita kwayo kugadzikana.
Iyo nzira yekugadzira yehydroxyethyl cellulose inonyanya kusanganisira kugadzirwa kwezvinhu, alkalization kurapwa, etherification reaction, neutralization uye kugeza, kupera mvura uye kuomesa, kugaya uye kuongorora, uye yekupedzisira chigadzirwa kurongedza uye kuchengetedza. Imwe neimwe nhanho ine yayo yakakosha maitiro zvinodiwa uye mapoinzi ekudzora. Mamiriro ekuita uye maitiro ekushanda anofanirwa kunyatsodzorwa panguva yekugadzira maitiro kuti ive nechokwadi chemhando uye yakagadzikana kuita kwechigadzirwa. Iyi multifunctional polymer zvinhu zvine huwandu hwakasiyana hwekushandisa mukugadzirwa kwemaindasitiri uye hupenyu hwezuva nezuva, zvichiratidza kukosha kwayo kusingadzoreki.
Nguva yekutumira: Aug-21-2024