Inkqubo yokwenziwa kwe-methyl cellulose ether
Ukwenziwa kwei-methyl cellulose etheribandakanya ukuguqulwa kweekhemikhali zeselulosi ngokusabela kwe-etherification.I-Methyl cellulose (MC) yi-ether ye-cellulose e-soluble yamanzi esetyenziswa ngokubanzi kumashishini ahlukeneyo.Nantsi inkcazo jikelele yenkqubo yokwenziwa kwe-methyl cellulose ether:
1. Ukukhethwa kweSelulosi Umthombo:
- Inkqubo iqala ngokukhethwa komthombo we-cellulose, oqhelekileyo ophuma kwi-pulp yokhuni okanye ikotoni.Umthombo we-cellulose ukhethwa ngokusekelwe kwiimpawu ezifunwayo zemveliso yokugqibela ye-methyl cellulose.
2. Ukutsala:
- Umthombo we-cellulose okhethiweyo wenziwa i-pulping, inkqubo eqhekeza iifibers zibe yifom elawulekayo ngakumbi.I-Pulping inokufezekiswa ngeendlela zoomatshini okanye zekhemikhali.
3. Ukusebenza kweSelulosi:
- I-pulped cellulose iye isebenze ngokuyiphatha ngesisombululo se-alkaline.Eli nyathelo lijolise ekudumbeni imicu yecellulose, ibenze basebenze ngakumbi ngexesha lokusabela kwe-etherification elandelayo.
4. I-Etherification Reaction:
- I-cellulose esebenzayo ingena kwi-etherification, apho amaqela e-ether, kulo mzekelo, amaqela e-methyl, aziswa kumaqela e-hydroxyl kwikhonkco le-polymer cellulose.
- Ukusabela kwe-etherification kubandakanya ukusetyenziswa kwee-agent ze-methylating ezifana ne-sodium hydroxide kunye ne-methyl chloride okanye i-dimethyl sulfate.Iimeko zokusabela, kubandakanywa ubushushu, uxinzelelo, kunye nexesha lokuphendula, zilawulwa ngononophelo ukufezekisa iqondo elifunekayo lokuthatha indawo (DS).
5. Ukungathathi hlangothi kunye nokuHlanjwa:
- Emva kokusabela kwe-etherification, imveliso ingathathi hlangothi ukususa i-alkali engaphezulu.Amanyathelo okuhlamba alandelayo aqhutyelwa ukuphelisa iikhemikhali ezishiyekileyo kunye nokungcola.
6. Ukomisa:
- I-cellulose ecocekileyo kunye ne-methylated yomisiwe ukufumana imveliso ye-methyl cellulose ether yokugqibela ngendlela yepowder okanye i-granules.
7. Ulawulo loMgangatho:
- Ubuchule bokuhlalutya obahlukeneyo, kuqukwa i-nuclear magnetic resonance (NMR) spectroscopy, iFourier-transform infrared (FTIR) spectroscopy, kunye nechromatography, zisetyenziselwe ukulawula umgangatho.Umgangatho wokutshintshwa (DS) yiparameter ebalulekileyo ebekwe esweni ngexesha lemveliso.
8. Uqulunqo kunye nokuPakisha:
- I-methyl cellulose ether iye iqulunqwe ngokwamabakala ahlukeneyo ukuhlangabezana neemfuno ezithile zezicelo ezahlukeneyo.Amabanga ahlukeneyo anokwahluka kwi-viscosity yawo, ubungakanani bamasuntswana, kunye nezinye iipropathi.
- Iimveliso zokugqibela zipakishwe ukuze zisasazwe.
Kubalulekile ukuqaphela ukuba iimeko ezithile kunye nee-reagents ezisetyenziswa kwi-etherification reaction inokwahluka ngokusekelwe kwiinkqubo zobunikazi bomenzi kunye neempawu ezifunwayo zemveliso ye-methyl cellulose.I-Methyl cellulose ifumana izicelo kwishishini lokutya, amayeza, ulwakhiwo, kunye namanye amacandelo ngenxa yokunyibilika kwamanzi kunye nobuchule bokwenza ifilimu.
Ixesha lokuposa: Jan-21-2024