I-Methylcellulose (MC) kunye ne-carboxymethylcellulose (CMC) zimbini eziqhelekileyo ze-cellulose derivatives, ezisetyenziswa ngokubanzi kukutya, amayeza, ukwakhiwa, imboni yeekhemikhali kunye nezinye iinkalo. Nangona zonke ziguqulwe ngokwekhemikhali ukusuka kwiselulosi yendalo, kukho umahluko omkhulu kulwakhiwo lweekhemikhali, iipropathi zomzimba kunye neekhemikhali, kunye nokusetyenziswa.
1. Ukwakhiwa kweekhemikhali kunye nenkqubo yokulungiselela
I-Methylcellulose iveliswa ngokuphendula i-cellulose kunye ne-methyl chloride (okanye i-methanol) phantsi kweemeko ze-alkaline. Ngethuba le nkqubo, inxalenye yamaqela e-hydroxyl (-OH) kwiimolekyuli ze-cellulose zithathelwa indawo ngamaqela e-methoxy (-OCH₃) ukwenza i-methylcellulose. Iqondo lokutshintshwa (i-DS, inani lababambeli kwiyunithi ye-glucose) ye-methylcellulose imisela iimpawu zayo zomzimba kunye neekhemikhali, ezifana nokunyibilika kunye ne-viscosity.
I-Carboxymethylcellulose iveliswa ngokuphendula i-cellulose kunye ne-chloroacetic acid phantsi kweemeko ze-alkaline, kwaye iqela le-hydroxyl litshintshwa yi-carboxymethyl (-CH₂COOH). Iqondo lokutshintshwa kunye neqondo le-polymerization (DP) ye-CMC ichaphazela ukunyibilika kwayo kunye ne-viscosity emanzini. I-CMC idla ngokubakho ngokohlobo lwetyuwa yesodium, ebizwa ngokuba yi-sodium carboxymethylcellulose (NaCMC).
2. Iimpawu zomzimba kunye neekhemikhali
Ukunyibilika: I-Methylcellulose inyibilika emanzini abandayo, kodwa ilahlekelwa yi-solubility kwaye yenza ijeli emanzini ashushu. Oku kuguqulwa kwe-thermal kwenza ukusetyenziswa kwayo njenge-thickener kunye ne-gelling agent ekusetyenzweni kokutya. I-CMC iyanyibilika kumanzi abandayo kunye nashushu, kodwa i-viscosity yesisombululo sayo iyancipha njengoko ubushushu bonyuka.
I-Viscosity: I-viscosity yabo bobabini ichatshazelwa ngumgangatho wokutshintshwa kunye noxinzelelo lwesisombululo. I-viscosity ye-MC inyuka kuqala kwaye iyancipha njengoko iqondo lokushisa lisanda, ngelixa i-viscosity ye-CMC iyancipha njengoko ubushushu bukhula. Oku kubanika inzuzo yabo kwizicelo ezahlukeneyo zoshishino.
pH uzinzo: I-CMC ihlala izinzile kuluhlu olubanzi lwe-pH, ngakumbi phantsi kweemeko ze-alkaline, nto leyo eyenza ukuba idume kakhulu njenge-stabilizer kunye ne-thickener ekutyeni nakwi-pharmaceuticals. I-MC izinzile phantsi kweemeko ezingathathi hlangothi kunye ne-alkaline encinci, kodwa iya kuthotywa kwi-acids eqinile okanye i-alkalis.
3. Iindawo zokufaka izicelo
Ishishini lokutya: I-Methylcellulose isetyenziswa ngokuqhelekileyo ekutyeni njenge-thickener, emulsifier kunye ne-stabilizer. Umzekelo, inokulinganisa incasa kunye nokuthungwa kwamafutha xa ivelisa ukutya okunamafutha aphantsi. I-Carboxymethylcellulose isetyenziswa ngokubanzi kwiziselo, izinto ezibhakiweyo kunye neemveliso zobisi njenge-thickener kunye ne-stabilizer ukukhusela ukwahlukana kwamanzi kunye nokuphucula incasa.
Umzi-mveliso wamachiza: I-Methylcellulose isetyenziselwa ukulungiswa kweepilisi zamachiza njenge-binder kunye ne-disintegrant, kunye ne-lubricant kunye ne-agent ekhuselayo, njengamaconsi e-ophthalmic esweni njengento yokukrazula. I-CMC isetyenziswa kakhulu kwezamayeza ngenxa ye-biocompatibility yayo elungileyo, njengokulungiswa kwamachiza akhutshwa ngokuzinzileyo kunye nokuncamathelisa kumathontsi wamehlo.
Ushishino lokwakha kunye neekhemikhali: I-MC isetyenziswa ngokubanzi kwizinto zokwakha njenge-thickener, i-arhente yokugcina amanzi kunye ne-adhesive ye-samente kunye ne-gypsum. Inokuphucula ukusebenza kokwakhiwa kunye nomgangatho ophezulu wezinto eziphathekayo. I-CMC ihlala isetyenziswa kunyango lodaka kwimigodi ye-oyile, i-slurry kushicilelo lwe-textile kunye nokudaya, ukugquma kwephepha, njl.
4. Ukhuseleko kunye nokukhuselwa kwendalo
Zombini zithathwa njengekhuselekile ukuba zisetyenziswe ekutyeni nasekwenzeni amayeza, kodwa imithombo yazo kunye neenkqubo zokuvelisa zinokuba neempembelelo ezahlukeneyo kokusingqongileyo. Iimathiriyeli ekrwada ye-MC kunye ne-CMC zithathwe kwi-cellulose yendalo kwaye i-biodegradable, ngoko ke ziqhuba kakuhle ngokuhambelana nokusingqongileyo. Nangona kunjalo, inkqubo yabo yokuvelisa inokubandakanya izinyibilikisi zemichiza kunye nee-reagents, ezinokuthi zibe nefuthe elithile kwindalo.
5. Ixabiso kunye nemfuno yemarike
Ngenxa yeenkqubo ezahlukeneyo zemveliso, ixabiso lokuvelisa i-methylcellulose lihlala liphezulu, ngoko ke ixabiso layo lemarike liphezulu kune-carboxymethylcellulose. I-CMC ngokubanzi inemfuno enkulu yemarike ngenxa yesicelo sayo esibanzi kunye neendleko eziphantsi zemveliso.
Nangona i-methylcellulose kunye ne-carboxymethylcellulose zombini ziphuma kwiselulosi, zinomohluko omkhulu kulwakhiwo, iipropathi, usetyenziso kunye nemfuno yentengiso. I-Methylcellulose isetyenziswa kakhulu kwiinkalo zokutya, amayeza kunye nezixhobo zokwakha ngenxa yokuguqulwa kwayo okungafaniyo kwe-thermal kunye nokulawulwa kwe-viscosity ephezulu. I-Carboxymethyl cellulose isetyenziswe ngokubanzi ekutyeni, kumayeza, kwi-petrochemical, kwi-textile kunye nakwamanye amashishini ngenxa yokunyibilika kwayo okugqwesileyo, ukulungiswa kwe-viscosity kunye nokuguquguquka kwe-pH ebanzi. Ukukhethwa kwe-cellulose derivative kuxhomekeke kwimeko yesicelo esithile kunye neemfuno.
Ixesha lokuposa: Aug-20-2024