Ukulungiswa kwe-cellulose ethers

Ulungiselelo lwei-cellulose ethersibandakanya ukuguqulwa ngokwekhemikhali kwiselulosi yendalo yepolymer ngokusabela kwe-etherification. Le nkqubo yazisa amaqela e-ether kumaqela e-hydroxyl ye-cellulose polymer chain, ekhokelela ekubunjweni kwe-cellulose ethers eneempawu ezizodwa. Ezona zixhaphakileyo ze-cellulose ethers ziquka iHydroxypropyl Methylcellulose (HPMC), Carboxymethyl Cellulose (CMC), Hydroxyethyl Cellulose (HEC), Methyl Cellulose (MC), kunye ne-Ethyl Cellulose (EC). Nantsi inkcazo jikelele yenkqubo yokulungiselela:

1. Ukufumana iSelulosi:

• Inkqubo iqala ngokufumana i-cellulose, ehlala ivela kwintlama yomthi okanye umqhaphu. Ukukhethwa komthombo we-cellulose kunokuchaphazela iipropati zemveliso yokugqibela ye-cellulose ether.

2. Ukutsala:

• I-cellulose ixhomekeke kwiinkqubo ze-pulping ukuphula iifibers zibe yifom elawulekayo. Oku kunokubandakanya iindlela zokucofa ngoomatshini okanye ngemichiza.

3. Ukucoca:

• I-cellulose ihlanjululwa ukuze isuse ukungcola, i-lignin, kunye nezinye izinto ezingezo-cellulosic. Eli nyathelo lokucoca libalulekile ekufumaneni imathiriyeli ye-cellulose ekumgangatho ophezulu.

4. I-Etherification Reaction:

• I-cellulose ecocekileyo idlula i-etherification, apho amaqela e-ether aziswa kumaqela e-hydroxyl kwikhonkco le-polymer cellulose. Ukhetho lwe-etherifying agent kunye neemeko zokusabela kuxhomekeke kwimveliso efunwayo ye-cellulose ether.
• Ii-etherifying agents eziqhelekileyo ziquka i-ethylene oxide, i-propylene oxide, i-sodium chloroacetate, i-methyl chloride, kunye nabanye.

5. Ulawulo lweeParamitha zokuSebenza:

• Ukusabela kwe-etherification kulawulwa ngononophelo ngokwemiqathango yobushushu, uxinzelelo, kunye ne-pH ukuphumeza iqondo elinqwenelekayo lokuthatha indawo (DS) kwaye uphephe ukuphendula kwamacala.
• Iimeko zealkaline zihlala ziqashwa, kwaye i-pH yomxube wokusabela ijongwa ngokusondeleyo.

6. Ukungathathi hlangothi kunye nokuHlanjwa:

• Emva kokusabela kwe-etherification, imveliso ihlala ingathathi hlangothi ukususa ii-reagents ezigqithisileyo okanye iimveliso. Eli nyathelo lilandelwa kukuhlanjwa ngokucokisekileyo ukuphelisa iikhemikhali ezishiyekileyo kunye nokungcola.

7. Ukomisa:

• I-cellulose ehlanjululweyo kunye ne-etherified yomisiwe ukufumana imveliso yokugqibela ye-cellulose ether kwi-powder okanye i-granular form.

8. Ulawulo loMgangatho:

• Ubuchule bokuhlalutya obahlukeneyo busetyenziselwe ulawulo lomgangatho, kuqukwa i-nuclear magnetic resonance (NMR) spectroscopy, iFourier-transform infrared (FTIR) spectroscopy, kunye nechromatography.
• Iqondo lokutshintshwa (DS) yiparameter ebalulekileyo ebekwe esweni ngexesha lemveliso ukuqinisekisa ukuhambelana.

9. Uqulunqo kunye nokuPakisha:

• I-ether ye-cellulose iye iqulunqwe ibe ngamabakala ahlukeneyo ukuhlangabezana neemfuno ezithile zezicelo ezahlukeneyo. Iimveliso zokugqibela zipakishwe ukuze zisasazwe.

Ukulungiswa kwe-cellulose ethers yinkqubo yekhemikhali eyinkimbinkimbi efuna ukulawulwa ngokucophelela kweemeko zokusabela ukufezekisa iipropati ezifunwayo. Ukuguquguquka kwe-cellulose ethers kuvumela ukusetyenziswa kwazo kuluhlu olubanzi lwezicelo kuwo wonke amashishini, kubandakanywa amayeza, ukutya, ukwakhiwa, iingubo, kunye nokunye.