I-Methylcellose (MC) kanye ne-carboxymethylcellellulose (CMC) ziyizinto ezimbili ezivamile zeselula, ezisetshenziswa kabanzi ekudleni, umuthi, ezokwakha imboni namakhemikhali. Yize bonke baguqulwa ngamakhemikhali kusuka ku-cellulose yemvelo, kunomehluko omkhulu kusakhiwo samakhemikhali, ngokomzimba nangamakhemikhali, kanye nezicelo.
1. Inqubo yamakhemikhali nenqubo yokulungiselela
I-methylcellose ikhiqizwa ngokuphendula i-cellulose nge-methyl chloride (noma i-methanol) ngaphansi kwezimo ze-alkaline. Ngale nqubo, ingxenye yamaqembu e-hydroxyl (-OH) kuma-molecule we-cellulose athathelwa indawo amaqembu we-methoxy (-Och₃) ukwakha i-methylcellulose. Izinga lokufakwa esikhundleni (DS, inani labameleli liyunithi ye-glucose) ye-methylcellulose) ye-methylcellulose inquma izakhiwo zayo zomzimba neyomakhemikhali, njenge-solubity nokuvuleka.
I-Carboxymethylcellellose ikhiqizwa ngokuphendula iselula nge-chlororose acid ngaphansi kwezimo ze-alkali, futhi iqembu le-hydroxyl lithathelwa indawo yiCarboxymethyl (-CH₂COOH). Izinga lokufakwa esikhundleni kanye ne-degree of polymerization (DP) ye-CMC lithinta i-solubility yalo nokuvunywa emanzini. I-CMC ivame ukuba khona ngendlela kasawoti kasodium, ebizwa ngeSodium carboxymethylcellellellulose (NACMC).
2. Izakhiwo zenyama nezamakhemikhali
I-Solubity: I-Methylcellose ihlakazekile emanzini abandayo, kepha ilahlekelwa yi-solubility futhi yakha ijeli emanzini ashisayo. Lokhu kuncipha okushisayo kwenza ukusetshenziswa kwayo njenge-gent enkulu kanye ne-ejenti yokuhlanza ukucubungula. I-CMC iyanyibilika kuwo womabili lamanzi abandayo nawashisayo, kepha ukubonwa kwesixazululo kwalo kuncipha njengoba izinga lokushisa lenyuka.
I-Viscosity: I-viscosity yazo zombili ithintwe ngezinga lokufakwa esikhundleni kanye nokuhlushwa kwesixazululo. I-viscosity ye-MC iyakhuphuka bese iyancipha njengoba izinga lokushisa likhuphuka, ngenkathi i-viscosity ye-CMC yehla njengoba izinga lokushisa liyanda. Lokhu kubanikeza izinzuzo zabo ezinhlelweni ezahlukahlukene zezimboni.
Ukuqina kwe-PH: I-CMC ihlala izinzile ngaphezu kwebanga le-PH, ikakhulukazi ngaphansi kwezimo ze-alkali, ezikwenza idume kakhulu njenge-stabilizer kanye nomkhuhlane ekudleni nasemikhakheni. I-MC izinzile ngaphansi kwezimo ezingathathi hlangothi futhi kancane, kepha zizodalula ama-acid aqinile noma i-alkalis.
3. Izindawo zohlelo lokusebenza
Imboni yokudla: I-methylcellulose isetshenziswa kakhulu ekudleni njengoMkhulu, i-Emulsifier neStabilizer. Isibonelo, kungalingisa ukunambitheka kanye nokuthungwa kwamafutha lapho kukhiqiza ukudla okunamafutha amancane. I-Carboxymethylcellellose isetshenziswa kabanzi eziphuzweni, izimpahla ezibhakiwe kanye nemikhiqizo yobisi njenge-smilener ne-stabilizer ukuvikela ukuhlukaniswa kwamanzi futhi kuthuthukise ukunambitheka.
Imboni yezemithi: I-methylcellulose isetshenziswa lapho kulungiswa amaphilisi wezemithi njenge-binder nokuqhekeka, futhi njenge-ejenti yokuthambisa kanye nokuvikela, njengasekuhlotsheni kwamehlo okuvikelayo. I-CMC isetshenziswa kabanzi kwezokwelapha ngenxa yokuthambekela kwayo okuhle, njengokulungiselela izidakamizwa ezikhipha izidakamizwa kanye nokunamathela kumaconsi wamehlo.
Imboni yezokwakha neyamakhemikhali: I-MC isetshenziswa kabanzi ezintweni zokwakha njengomuntu omkhulu, i-ejenti yokugcina amanzi kanye nokunamathela ngokosimende kanye ne-gypsum. Kungathuthukisa ukusebenza kokwakha kanye nekhwalithi ephezulu yezinto zokwakha. I-CMC ivame ukusetshenziswa ekwelashweni ngodaka ezimayini zensimu yamafutha, ukunqwabelana ngokuphrinta kwendwangu nodaya, ukuhlanganiswa kwephepha elingaphezulu, njll.
4. Ukuphepha nokuvikelwa kwemvelo
Zombili zibhekwa njengephephile ukuze zisetshenziswe ekusetshenzisweni kwezicelo zokudla kanye nemithi, kepha imithombo yazo nezinqubo zokukhiqiza zingaba nemithelela ehlukene emvelweni. Izinto ezivuthiwe ze-MC ne-CMC zitholakala kwi-cellulose yemvelo futhi ziyi-biodegradable, ngakho-ke zenza kahle ngokwemigomo yobungani bezemvelo. Kodwa-ke, inqubo yabo yokukhiqiza ingahle ifake phakathi izinkuni zamakhemikhali nama-reagents, angaba nomthelela othile emvelweni.
I-5
Ngenxa yezinqubo ezahlukahlukene zokukhiqiza, izindleko zokukhiqiza ze-methylcellulose zivame kakhulu, ngakho-ke intengo yayo yemakethe ibuye iphakeme kune-carboxymethylcellellulose. I-CMC ngokuvamile inesidingo esikhulu semakethe ngenxa yesicelo sayo ebanzi kanye nezindleko zokukhiqiza eziphansi.
Yize i-methylcellose kanye ne-carboxymethylcellellellulose zombili ze-cellulose, zinokwehluka okukhulu esakhiweni, izakhiwo, izinhlelo zokusebenza kanye nesidingo semakethe. I-methylcellose isetshenziswa ikakhulukazi emikhakheni yokudla, umuthi kanye nezinto zokwakha ngenxa yokubuyiselwa kwayo okuhlukile okuhlukile nokulawulwa okuphezulu kwensiza ephezulu. I-Carboxymethyl Cellulose isetshenziswe kabanzi ekudleni, emithini, i-petrochemical, izindwangu kanye nezinye izimboni ngenxa yokuguquguquka kwayo okuhle, ukulungiswa kwensizwa kanye nokuguqulwa okubanzi. Ukukhethwa kwe-cellulose derivative kuncike kwisimo esithile sohlelo lokusebenza nezidingo.
Isikhathi sePosi: Aug-20-2024