CMC waxay u isticmaashaa Warshada saabuunta

Carboxymethyl cellulose (sidoo kale loo yaqaan CMC iyo sodium carboxymethyl cellulose) waxaa lagu tilmaami karaa sida polymer biyaha-millan anionic, laga soo saaray cellulose dabiiciga ah iyada oo loo marayo etherification, beddelaya kooxda hydroxyl kooxda carboxymethyl on cellulose silsilad carboxymethyl cellulose waxaa loo isticmaalaa sida xidhe ah, dhumuc weyn, wakiilka laalista iyo buuxinta ee codsiyada kala duwan.

Mabda'a falcelinta

Dareen-celinta kiimikada ugu weyn ee CMC waa falcelinta alkalization ee cellulose iyo alkali si ay u sameeyaan cellulose alkali iyo falcelinta etherification ee cellulose alkali iyo monochloroacetic acid.

Tallaabada 1: Alkalisation: [C6H7O2(OH) 3] n + nNaOH→[C6H7O2(OH) 2ONa] n + nH2O

Talaabada 2: Etherification: [C6H7O2(OH) 2ONa] n + nClCH2COONa→[C6H7O2(OH) 2OCH2COONa ]n + nNaCl

Dabeecadda kiimikada

Kala soocida cellulose ee leh beddelka karboxymethyl waxaa lagu diyaariyaa in lagu daaweeyo cellulose leh sodium hydroxide si loo sameeyo cellulose alkali, ka dibna la falgasha monochloroacetic acid. Unugga gulukoosta ee ka kooban cellulose wuxuu leeyahay 3 kooxood oo hydroxyl ah oo la bedeli karo, sidaas darteed alaabooyinka leh heerar kala duwan oo beddel ah ayaa la heli karaa. Celcelis ahaan, 1 mmol oo karboxymethyl ah ayaa lagu soo bandhigaa 1 g oo miisaan qallalan. Waa mid aan lagu milmi karin biyaha iyo aashitada, laakiin way barari kartaa waxaana loo isticmaali karaa chromatography beddelashada ion. pKa ee karboxymethyl waxay ku saabsan tahay 4 ee biyo saafi ah iyo qiyaastii 3.5 gudaha 0.5mol/L NaCl. Waa beddelka aashitada daciifka ah waxaana badanaa loo adeegsadaa kala soocida borotiinnada dhexdhexaadka ah iyo kuwa aasaasiga ah ee pH 4 ama ka sarreeya. Kuwa leh in ka badan 40% ee kooxaha hydroxyl ee lagu beddelay karboksymethyl waxaa lagu milmi karaa biyo si ay u sameeyaan xal kolloidal sare leh oo deggan.

Tilmaamaha alaabta eesaabuunta heerka CMC

Ka dib markii lagu daro saabuunta, joogtayntu waa mid sareysa, hufan, oo aan dib ugu soo laaban dhuuban;

Waxay si wax ku ool ah u dhumucdi kartaa oo u dejin kartaa ka kooban saabuunta dareeraha ah;

Ku darista budada lagu dhaqo iyo saabuunta dareeraha ah waxay ka ilaalin kartaa wasakhda la dhaqay inay mar kale ku degto marada. Ku darida 0.5-2% saabuunta synthetic waxay gaari kartaa natiijooyin lagu qanco;

CMC waxay u isticmaashaa Warshada saabuunta, inta badandiiradda saara Emulsification iyo sifooyinka kolloid ilaalinta ee CMC. Anion-ka la soo saaro inta lagu jiro habka dhaqidda ayaa isku mar ka dhigi kara dusha sare ee dhaqidda iyo walxaha wasakhda ah ee si xun u dallacaya, si ay qaybaha wasakhdu u yeeshaan kala-soocidda wajiga wajiga biyaha waxayna saameyn isku mid ah ku yeeshaan dusha sare ee dhaqidda adag. Dib-u-celinta, waxay ka hortagtaa wasakhda inay dib u dhigto dharka dharka, waxay ilaalin kartaa caddaanka dharka cad, iyo midabada dhalaalaya ee dharka midabka leh.

Shaqada ee CMC gudahasaabuunta

1. Dhumucda, kala firdhinta iyo emulsifying, waxay nuugi kartaa wasakhda saliidda leh ee ku wareegsan meelaha si ay ugu duubto wasakhda saliidda leh, si ay wasakhda saliidda ah u laalaan oo ay ku dhex firdhiso biyaha, oo ay sameeyaan filim hydrophilic dusha alaabta la dhaqay, si looga hortago wasakh saliid leh oo si toos ah ula xidhiidha alaabta la dhaqay .
2. Heerka sare ee beddelka iyo isku-dhafka, daahfurnaanta wanaagsan;
3. Kala firdhinta wanaagsan ee biyaha iyo iska caabbinta resorption wanaagsan;
4. Viscosity heer sare ah iyo xasilooni wanaagsan.