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 nobunyulu. 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 ekukhetheni arhente etherifying, ezinye izinto ezichaphazela iqondo endaweni kunye nobunyulu kufuneka kwakhona ziqwalaselwe, ezifana nobudlelwane dosage phakathi kwealkali kunye arhente etherifying, ixesha etherification, isiqulatho amanzi inkqubo, ubushushu, ixabiso pH, ukugxininiswa isisombululo 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. (Ngokuphangaleleyo 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 yimveliso ye-sodium carboxymethylcellulose, yinyibilikise kwi-50mL yamanzi kwaye ugxobhoze, yongeza inani elincinci ngexesha ngalinye, ugxobhoze kwi-60 ~ 70 ℃, kunye nokufudumala kwemizuzu engama-20 ukwenza isisombululo esifanayo, ukupholisa Emva kokufunyanwa kolwelo, iimvavanyo ezilandelayo zenziwa.
1. Yongeza amanzi kwisisombululo sokuvavanya ukuhlambulula amaxesha ama-5, yongeza i-0.5mL yesisombululo sovavanyo lwe-chromotropic kwi-1 ithontsi 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 ushukumise 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