I-CMC idla ngokuba yi-anionic polymer compound elungiselelwe ngokuphendula i-cellulose yendalo nge-caustic alkali kunye ne-monochloroacetic acid, enobunzima be-molecular obuyi-6400 (± 1 000). Iimveliso eziphambili yi-sodium chloride kunye ne-sodium glycolate. I-CMC yeye-natural cellulose modification. Ibizwa ngokusemthethweni ngokuba yi-"modified cellulose cellulose" yi-Food and Agriculture Organisation ye-United Nations (FAO) kunye ne-World Health Organisation (WHO).
umgangatho
Izalathisi eziphambili zokulinganisa umgangatho we-CMC zizinga lokutshintshwa (DS) kunye nobunyulu. Ngokubanzi, iipropati ze-CMC zahlukile xa i-DS yahlukile; okukhona inqanaba lokutshintshwa liphezulu, kokukhona ukunyibilika kungcono, kwaye kokukhona ukucaca kunye nokuzinza kwesisombululo kubhetele. Ngokweengxelo, ukucaca kwe-CMC kungcono xa inqanaba lokutshintshwa liyi-0.7-1.2, kwaye i-viscosity yesisombululo sayo samanzi yeyona inkulu xa ixabiso le-pH liyi-6-9. Ukuze kuqinisekiswe umgangatho wayo, ukongeza ekukhetheni iarhente yokutshisa, ezinye izinto ezichaphazela inqanaba lokutshintshwa kunye nobunyulu nazo kufuneka ziqwalaselwe, njengobudlelwane bomthamo phakathi kwe-alkali kunye nearhente yokutshisa, ixesha lokutshisa, umxholo wamanzi wenkqubo, ubushushu, ixabiso le-pH, uxinzelelo lwesisombululo kunye neetyuwa.
Uhlalutyo lweenzuzo kunye nokungalungi kwe-sodium carboxymethyl cellulose
Uphuhliso lwe-sodium carboxymethyl cellulose alunakuthelekiswa nanto. Ingakumbi kwiminyaka yakutshanje, ukwandiswa kwamacandelo okusetyenziswa kunye nokunciphisa iindleko zemveliso kwenze ukwenziwa kwe-carboxymethyl cellulose kwathandwa ngakumbi. Iimveliso ezithengiswayo zixutyiwe.
Emva koko, indlela yokufumanisa umgangatho we-sodium carboxymethyl cellulose, sihlalutya ngokwembono ethile yomzimba neyekhemikhali:
Okokuqala, inokwahlulwa kubushushu bayo be-carbonization. Ubushushu obuqhelekileyo be-carbonization ye-sodium carboxymethyl cellulose yi-280-300 ° C. Xa i-carbonization ingekafiki kobu bushushu, ke le mveliso ineengxaki. (Ngokubanzi i-carbonization isebenzisa i-muffle furnace)
Okwesibini, yahlukile ngobushushu bayo bokutshintsha kombala. Ngokubanzi, i-sodium carboxymethyl cellulose iya kutshintsha umbala xa ifikelela kubushushu obuthile. Ububanzi bobushushu yi-190-200 °C.
Okwesithathu, inokubonwa ngenkangeleko yayo. Inkangeleko yeemveliso ezininzi yipowder emhlophe, kwaye ubukhulu bayo besuntswana ngokubanzi yi-100 mesh, kwaye amathuba okudlula yi-98.5%.
I-Sodium carboxymethyl cellulose yimveliso ye-cellulose esetyenziswa kakhulu kwaye ineendlela ezahlukeneyo zokusetyenziswa, ngoko ke kunokubakho ezinye izinto ezithengiswayo. Ngoko ke indlela yokuchonga ukuba yimveliso efunekayo kubasebenzisi inokuphumelela kolu vavanyo lulandelayo lokuchonga.
Khetha i-0.5g ye-sodium carboxymethyl cellulose, engaqinisekanga ukuba yimveliso ye-sodium carboxymethylcellulose, uyinyibilikise kwi-50mL yamanzi uze uyixube, yongeza inani elincinci ngalo lonke ixesha, yixube kwi-60 ~ 70 ℃, uze uyifudumale imizuzu engama-20 ukuze wenze isisombululo esifanayo, usipholise. Emva kokufunyanwa kolwelo, kwenziwe uvavanyo olulandelayo.
1. Yongeza amanzi kwisisombululo sovavanyo ukuze udibanise amaxesha ama-5, yongeza i-0.5mL yesisombululo sovavanyo lwe-chromotropic acid kwithontsi eli-1 laso, uze usifudumeze emanzini imizuzu eli-10 ukuze sibonakale sibomvu-mfusa.
2. Yongeza i-10 mL ye-acetone kwi-5 mL yesisombululo sovavanyo, shukumisa uze udibanise kakuhle ukuze wenze i-flocculent precipitate emhlophe.
3. Yongeza i-1mL yesisombululo sovavanyo se-ketone sulfate kwi-5mL yesisombululo sovavanyo, xuba uze ushukumise ukuze kuveliswe i-flocculent precipitate eluhlaza okwesibhakabhaka.
4. Intsalela efunyenwe ngokutshisa le mveliso ibonisa indlela eqhelekileyo yokusabela kwetyuwa yesodiyam, oko kukuthi, i-sodium carboxymethyl cellulose.
Ngale manyathelo, unokuchonga ukuba imveliso ethengiweyo yi-sodium carboxymethyl cellulose kunye nobunyulu bayo, nto leyo ebonelela ngendlela elula nesebenzisekayo kubasebenzisi yokukhetha iimveliso ngokuchanekileyo.
Ixesha lokuthumela: Novemba-12-2022