I-CMC idla ngokuba yi-anionic polymer compound elungiselelwe ngokusabela i-cellulose yendalo kunye ne-alkali ye-caustic kunye ne-monochloroacetic acid, kunye nobunzima be-molecular 6400 (± 1 000).Iimveliso eziphambili ze-sodium chloride kunye ne-sodium glycolate.I-CMC yeyendalo yokuguqulwa kweselulosi.Kuye kwabizwa ngokusemthethweni ngokuthi "i-cellulose ehlaziyiweyo" yi-Food and Agriculture Organization yeZizwe eziManyeneyo (i-FAO) kunye ne-World Health Organization (WHO).
umgangatho
Ezona zalathisi ziphambili zokulinganisa umgangatho we-CMC liqondo lokutshintshwa (DS) kunye nococeko.Ngokubanzi, iimpawu ze-CMC zahlukile xa i-DS yahlukile;iqondo eliphezulu lokutshintshwa, ngcono ukunyibilika, kwaye ngcono ukungafihli kunye nokuzinza kwesisombululo.Ngokutsho kweengxelo, ukucaca kwe-CMC kungcono xa i-degree of substitution i-0.7-1.2, kunye ne-viscosity yesisombululo sayo samanzi sikhulu xa ixabiso le-pH li-6-9.Ukuze kuqinisekiswe umgangatho wayo, ukongeza kukhetho lwe-ejenti etherifying, ezinye izinto ezichaphazela iqondo lokuthatha indawo kunye nobunyulu kufuneka ziqwalaselwe, ezifana nobudlelwane bedosi phakathi kwe-alkali kunye ne-ejenti etherifying, ixesha lokulinganisa, umxholo wamanzi wenkqubo, ubushushu. , ixabiso le-pH, ukugxininiswa kwesisombululo kunye neetyuwa.
Uhlalutyo lweenzuzo kunye nokungalunganga kwe-sodium carboxymethyl cellulose
Uphuhliso lwe-sodium carboxymethyl cellulose ngokwenene aluzange lubonwe ngaphambili.Ngokukodwa kwiminyaka yakutshanje, ukwandiswa kweendawo zokufaka izicelo kunye nokwehliswa kweendleko zokuvelisa kwenze ukuba ukwenziwa kwe-carboxymethyl cellulose kudume ngakumbi.Iimveliso ezithengiswayo zixutywe.
Emva koko, indlela yokumisela umgangatho we-sodium carboxymethyl cellulose, sihlalutya kwezinye iimbono zomzimba kunye neekhemikhali:
Okokuqala, iyakwazi ukwahlula kwiqondo lokushisa kwe-carbonization.Ubushushu obuqhelekileyo be-carbonization ye-sodium carboxymethyl cellulose yi-280-300 ° C. Xa i-carbonized ngaphambi kokuba lo bushushu bufikelelwe, ke le mveliso ineengxaki.(Ngokuqhelekileyo i-carbonization isebenzisa i-muffle furnace)
Okwesibini, yahlulwa bubushushu bayo bokujika kombala.Ngokuqhelekileyo, i-sodium carboxymethyl cellulose iya kutshintsha umbala xa ifikelela kubushushu obuthile.Uluhlu lobushushu luyi-190-200 °C.
Okwesithathu, inokuchongwa ngokubonakala kwayo.Ukubonakala kweemveliso ezininzi ngumgubo omhlophe, kwaye ubungakanani bayo be-particle ngokuqhelekileyo yi-100 mesh, kwaye amathuba okudlula ngama-98.5%.
I-sodium carboxymethyl cellulose yimveliso yeselulosi esetyenziswa kakhulu kwaye inoluhlu olubanzi lwezicelo, ngoko ke kunokubakho ukulinganisa kwimarike.Ke indlela yokuchonga ukuba ngaba yimveliso efunwa ngabasebenzisi banokuphumelela olu vavanyo lokuchongwa lulandelayo.
Khetha i-0.5g ye-sodium carboxymethyl cellulose, engaqinisekanga ukuba iyimveliso ye-sodium carboxymethylcellulose, yinyibilikise kwi-50mL yamanzi kwaye ugxobhoze, yongeza inani elincinci ngexesha ngalinye, ugxobhoze kwi-60 ~ 70 ℃, kunye nokufudumala imizuzu engama-20 yenza isisombululo esifanayo, epholile Emva kokufunyanwa kolwelo, iimvavanyo ezilandelayo zenziwa.
1. Yongeza amanzi kwisisombululo sokuvavanya ukuhlambulula amaxesha ama-5, yongeza i-0.5mL yesisombululo sovavanyo lwe-chromotropic kwi-drop 1 yayo, kwaye uyitshise kwindawo yokuhlambela amanzi imizuzu eyi-10 ukuze ibonakale ibomvu-mfusa.
2. Yongeza i-10 mL ye-acetone kwi-5 mL yesisombululo sovavanyo, xubha kwaye udibanise ngokucokisekileyo ukuvelisa i-flocculent precipitate emhlophe.
3. Yongeza i-1mL yesisombululo sovavanyo lwe-ketone sulfate kwi-5mL yesisombululo sovavanyo, xuba kwaye uvuthulule ukuvelisa i-flocculent precipitate eluhlaza okwesibhakabhaka.
4. Intsalela efunyenwe ngothuthu lwale mveliso ibonisa ukusabela okuqhelekileyo kwetyuwa yesodium, oko kukuthi, i-sodium carboxymethyl cellulose.
Ngala manyathelo, unokwazi ukubona ukuba imveliso ethengiweyo yi-sodium carboxymethyl cellulose kunye nokucoceka kwayo, ebonelela ngendlela elula nesebenzayo kubasebenzisi ukukhetha ngokuchanekileyo iimveliso.
Ixesha lokuposa: Nov-12-2022