Sodium Carboxymethyl Cellulose Viscosity

Viscosity ee sodium carboxymethyl cellulose waxa kale oo loo qaybiyaa darajooyin badan sida isticmaalka kala duwan. Viscosity ee nooca dhaqidda waa 10 ~ 70 (ka hooseeya 100), xadka sare ee viscosity waa laga bilaabo 200 ~ 1200 ee dhismaha qurxinta iyo warshadaha kale, iyo viscosity ee darajada cuntada waa xitaa sare. Dhammaantood way ka sarreeyaan 1000, iyo viscosity ee warshadaha kala duwan ma aha isku mid.

Sababtoo ah adeegsigeeda ballaaran.
Viscosity of sodium carboxymethyl cellulose saamayn ku cufka molecular qaraabo, fiirsashada, heerkulka iyo qiimaha pH, iyo waxa lagu daraa ethyl ama carboxypropyl cellulose, gelatin, xanthan xanjo, carrageenan, xanjo ayax, xanjo guar, agar, sodium alginate, pectin, cirridka carabiga iyo istaarijka iyo ka-soo-saarkeedu waxay leeyihiin iswaafajin wanaagsan (ie saamayn isku-dhafan).

Marka qiimaha pH uu yahay 7, viscosity of sodium carboxymethyl cellulose xal waa ugu sarreeya, iyo marka pH qiimaha waa 4 ~ 11, waa mid deggan. Carboxymethylcellulose oo ah qaabka birta alkali iyo ammonium cusbada ayaa ku milmay biyaha. Iions biraha kala duwan Ca2+, Mg2+, Fe2+ waxay saamayn karaan viscositykeeda. Biraha culculus sida qalinka, barium, chromium ama Fe3+ waxay ka dhigi karaan inay soo dedejiyaan xal. Haddii diirada ions la xakameeyo, sida ku darida wakiilka chelating citric acid, xal aad u badan ayaa la samayn karaa, taasoo keentay cirrid jilicsan ama adag.

Sodium carboxymethyl cellulose waa nooc ka mid ah cellulose dabiiciga ah, kaas oo guud ahaan laga sameeyay suufka suufka ah ama saxarka alwaax sida alaabta ceeriin oo lagu sakhiray falcelinta etherification leh monochloroacetic acid hoos yimaada xaaladaha alkaline.

Marka loo eego qeexitaannada alaabta ceeriin iyo beddelka hydroxyl hydrogen ee unugga cellulose D-glucose ee kooxda karboxymethyl, xeryahooda polymer-biyoodka-milmi leh oo leh heerar kala duwan oo beddelaad ah iyo qaybinta miisaanka kelli ee kala duwan ayaa la helay.

Sababtoo ah sodium carboxymethyl cellulose waxay leedahay sifooyin badan oo gaar ah oo aad u fiican, waxaa si ballaaran loo isticmaalaa warshadaha kiimikada maalinlaha ah, cuntada iyo daawada iyo wax soo saarka kale ee warshadaha.

Mid ka mid ah tilmaamayaasha ugu muhiimsan ee sodium carboxymethyl cellulose waa viscosity ee sodium carboxymethyl cellulose. Qiimaha viscosity wuxuu la xiriiraa arrimo kala duwan sida feejignaanta, heerkulka iyo heerka xiirid. Si kastaba ha ahaatee, arrimaha ay ka midka yihiin xoojinta, heerkulka iyo heerka xiiriddu waa arrimaha dibadda ee saameeya viscosity sodium carboxymethyl cellulose.

Miisaankeeda kelli iyo qaybinta molecular waa arrimaha gudaha ee saameeya viscosity sodium carboxymethyl cellulose xal. Si loo xakameeyo wax soo saarka iyo horumarinta wax soo saarka ee sodium carboxymethyl cellulose, cilmi-baarista miisaankeeda kelli iyo qaybinta miisaanka kelli waxay leedahay qiimo tixraac aad u muhiim ah, halka viscosity Cabbiradu waxay ciyaari kartaa oo kaliya door tixraac ah.

Sharciyada Newton ee rheology, fadlan akhri nuxurka ku habboon ee "rheology" ee kimistariga jireed, way adagtahay in lagu sharaxo hal ama laba jumladood. Haddii ay tahay inaad tiraahdo: xal dhexdhexaad ah cmc oo u dhow dareeraha Newtonian, diiqada xiiridu waxay la mid tahay heerka goynta, iyo isku dheelitirnaanta u dhexeeya iyaga waxaa loo yaqaan 'viscosity coefficient' ama kinematic viscosity.

Viscosity waxaa laga soo qaatay xoogagga u dhexeeya silsiladaha unugyada unugyada cellulose, oo ay ku jiraan xoogagga kala firdhisan iyo curaarta hydrogen. Gaar ahaan, polymerization of cellulose derivatives ma aha qaab-dhismeedka toosan laakiin qaab dhismeed fara badan. Xalka, cellulose badan oo laamo badan leh ayaa isku xiran si ay u sameeyaan qaab-dhismeedka shabakadaha bannaan. Marka uu qaab-dhismeedku sii adkaado, way sii weynaataa xoogagga u dhexeeya silsiladaha molecular ee xalka ka dhashay.

Si loo dhaliyo qulqulka dareeraha dareeraha ah ee unugyada cellulose, xoogga u dhexeeya silsiladaha molecular waa in laga adkaadaa, markaa xal heer sare ah oo polymerization ah ayaa u baahan xoog weyn si loo dhaliyo socodka. Qiyaasta viscosity, xoogga ku jira xalka CMC waa cufisjiid. Marka la eego xaaladda cufnaanta joogtada ah, qaabka silsiladda ee xalka CMC oo leh darajo weyn oo polymerization ah ayaa leh xoog weyn, socodkana waa gaabis. Qulqulka qunyar socodka ah wuxuu ka tarjumayaa viscosity.

Viscosity of sodium carboxymethyl cellulose inta badan waxay la xiriirtaa miisaanka kelli, wax yarna kuma laha heerka beddelka. Heerka weyn ee beddelka, ayaa ka weyn miisaanka kelli, sababtoo ah miisaanka kelli ee kooxda karboxymethyl ee la beddelay ayaa ka weyn kooxdii hore ee hydroxyl.

Milixda sodium ee cellulose karboxymethyl ether, anionic cellulose ether, waa budo fibros ah oo cad ama caano ah, oo leh cufnaanta 0.5-0.7 g/cm3, ku dhawaad ​​ur, aan dhadhamin, iyo hygroscopic. Way fududahay in lagu kala firdhiyo biyaha si loo sameeyo xal kolloid ah oo hufan, waana mid aan milmi karin dareerayaasha organic sida ethanol. pH ee 1% xal aqueous waa 6.5 ilaa 8.5. Marka pH>10 ama <5, viscosity of sodium carboxymethylcellulose si weyn loo dhimay, iyo waxqabadka ayaa ugu fiican marka pH = 7.

Kuleyl ahaan waa xasilloon. Viscosity-ku si degdeg ah ayuu uga kacaa 20 ℃, wuxuuna si tartiib ah isu beddelaa 45 ℃. Kuleyliyaha muddada-dheer ee ka sarreeya 80 ℃ wuxuu diidaa kolloid-ka wuxuuna si weyn u dhimi karaa viscosity iyo waxqabadka. Waxay si fudud ugu milmi kartaa biyaha, xalkuna waa mid hufan; aad bay u deggan tahay xalalka alkaline-ka, wayna fududahay in la hydrolyze marka ay jirto aashitada. Marka qiimaha pH uu yahay 2-3, wuu soo da'ayaa.