Indlela yokwenza i-cellulose ether?
Ukukhiqizwa kwe-cellulose ethers kubandakanya ukuguqula amakhemikhali i-cellulose yemvelo, ngokuvamile etholakala ku-pulp yokhuni noma ukotini, ngochungechunge lokusabela kwamakhemikhali.Izinhlobo ezivame kakhulu ze-cellulose ethers zihlanganisa iMethyl Cellulose (MC), Hydroxyethyl Cellulose (HEC), Hydroxypropyl Methyl Cellulose (HPMC), Carboxymethyl Cellulose (CMC), nezinye.Inqubo ngqo ingase ihluke ngokusekelwe ku-cellulose ether ethile ekhiqizwayo, kodwa izinyathelo ezijwayelekile ziyefana.Nakhu ukubuka konke okwenziwe lula:
Izinyathelo Ezijwayelekile Zokwenza I-Cellulose Ethers:
1. Umthombo weCellulose:
- Izinto zokuqala ziyi-cellulose yemvelo, ngokuvamile etholakala ku-pulp yokhuni noma ukotini.I-cellulose ngokuvamile isesimweni se-purified cellulose pulp.
2. I-Alkalization:
- I-cellulose iphathwa ngesisombululo se-alkaline, njenge-sodium hydroxide (NaOH), ukuze kusebenze amaqembu e-hydroxyl ochungechungeni lwe-cellulose.Lesi sinyathelo se-alkalization sibalulekile ekuphumeni okwengeziwe.
3. I-Etherification:
- I-cellulose ye-alkali ingaphansi kwe-etherification, lapho amaqembu e-ether ahlukahlukene ethulwa kumgogodla we-cellulose.Uhlobo oluthile lweqembu le-ether elethuliwe (i-methyl, i-hydroxyethyl, i-hydroxypropyl, i-carboxymethyl, njll.) incike ku-ether ye-cellulose efunekayo.
- Inqubo ye-etherification ibandakanya ukusabela kwe-cellulose ngama-reagents afanelekile, afana nalokhu:
- NgeMethyl Cellulose (MC): Ukwelashwa nge-dimethyl sulfate noma i-methyl chloride.
- Nge-Hydroxyethyl Cellulose (HEC): Ukwelashwa nge-ethylene oxide.
- Nge-Hydroxypropyl Methyl Cellulose (HPMC): Ukwelashwa nge-propylene oxide ne-methyl chloride.
- NgeCarboxymethyl Cellulose (CMC): Ukwelashwa nge-sodium chloroacetate.
4. Ukungathathi hlangothi kanye Nokugeza:
- Ngemuva kokufakwa kwe-etherification, okuphuma kokuphuma ku-cellulose okuwumphumela kuvamise ukuba maphakathi ukuze kukhishwe noma iyiphi i-alkali esele.Umkhiqizo ube usuwashwa ukuze kuqedwe ukungcola kanye nemikhiqizo.
5. Ukomisa Nokugaya:
- I-cellulose ether yomiswa ukuze isuse umswakama owedlulele bese igaywa ibe yimpushana.Ubukhulu bezinhlayiyana bungalawulwa ngokusekelwe kuhlelo oluhlosiwe.
6. Ukulawula Ikhwalithi:
- Umkhiqizo wokugcina we-cellulose ether wenza izivivinyo zokulawula ikhwalithi ukuze uqiniseke ukuthi uhlangabezana nezicaciso ezithile, okuhlanganisa i-viscosity, okuqukethwe umswakama, ukusatshalaliswa kosayizi wezinhlayiyana, nezinye izici ezifanele.
Kubalulekile ukuqaphela ukuthi ukukhiqizwa kwe-cellulose ethers kwenziwa ngabakhiqizi abakhethekile besebenzisa izinqubo ezilawulwayo.Izimo ezithile, ama-reagents, nezinto zokusebenza ezisetshenziswayo zingahluka ngokuya ngezinto ezifiswayo ze-cellulose ether kanye nokusetshenziswa okuhlosiwe.Ukwengeza, izinyathelo zokuphepha zibalulekile phakathi nezinqubo zokuguqulwa kwamakhemikhali.
Isikhathi sokuthumela: Jan-01-2024