Sodium Carboxymethyl cellulose, xa mus rau raws li carboxymethyl cellulose (CMC) yog ib hom High-polymer tau npaj los ntawm cov cellulose ntuj. Nws cov qauv yog tsuas yog d-cov dej qab zib los ntawm β (1 → 4) glycosidic sib txuas sib txuas. Kev siv CMC muaj ntau yam zoo dua lwm cov zaub mov cov khoom noj.
01
CMC tau siv dav hauv cov zaub mov
(1) CMC muaj kev ruaj khov zoo
Hauv cov zaub mov txias xws li popsicles thiab mis nyuj khov, ua kom muaj cov qauv hluav taws xob, tiv thaiv melting, muaj lub ntsej muag zoo thiab du thiab whiten xim.
Hauv cov khoom noj siv mis, seb nws yog qab mis nyuj, kua mis nyuj muaj txiaj ntsig, nws muaj peev xwm ua rau muaj protein nyob rau hauv thaj tsam nrog kev ruaj ntseg ntawm emulsion thiab txhim kho cov protein tsis kam.
(2) cmc tuaj yeem sib txuas nrog lwm cov stabilizers thiab emulsifiers
Hauv cov khoom noj thiab dej haus cov khoom lag luam, cov kws ua lag luam dav dav siv ntau yam ntawm cov pa hluav taws xob, thiab lwm yam.
(3) cmc muaj pseudoplastic
Lub viscosity ntawm cmc yog thim rov qab ntawm ntau qhov kub. Raws li qhov kub nce, lub viscosity ntawm kev daws teeb meem tsawg, thiab hloov ua lwm yam; Thaum lub zog shear tshwm sim, lub viscosity ntawm cmc yuav tsawg dua, thiab nrog kev nce ntawm shear zog, lub viscosity yuav poob. Cov khoom no pab CMC kom txo cov khoom siv thauj khoom thiab txhim kho homogenization ua tau zoo thaum ua kom cov khoom thauj khoom, thiab xa hluav taws xob, uas yog unmatched los ntawm lwm cov stabilizers.
02
Cov txheej txheem yuav tsum tau ua
Raws li qhov tsis muaj peev xwm siv tau zoo, cmc yuav cuam tshuam nws cov nyhuv yog tias siv tsis raug, thiab txawm ua rau cov khoom yuav tsum tau txhuam. Yog li ntawd, rau CMC, nws yog qhov tseem ceeb heev rau tag nrho cov kev daws txhawm rau txhim kho nws txoj kev ua tau zoo, txo cov khoom lag luam zoo thiab nce tawm los. Tshwj xeeb, saib xyuas yuav tsum tau them rau txhua theem theem:
(1) Cov khoom xyaw
1. Kev ceev-ceev shear dispersion cov qauv nrog kev siv tshuab
Txhua cov khoom siv nrog kev sib xyaw muaj peev xwm tuaj yeem siv los pab CMC kom tawg hauv dej. Los ntawm kev kub-ceev shearing, cmc tuaj yeem yog tusyees soaked nyob rau hauv dej kom ceev rau cmc sib fab.
Qee cov tuam ntxhab tam sim no siv cov dej sib xyaw ua ke lossis cov hlau hluav taws kub ceev.
2. Qab Zib Qhuav Sib Txawv Sib Txawv
Sib tov zoo nrog CMC thiab cov suab thaj mranulated ntawm ib feem ntawm 1: 5, thiab nphoo nws maj mam nyob rau hauv tas mus li stirring mus rau tag nrho cov cmc.
3. Yaj nyob rau hauv dej noo noo
Xws li caramel, thiab lwm yam, tuaj yeem nrawm qhov kev sib cais ntawm CMC.
(2) acid ntxiv
Rau qee qhov dej acidic, xws li muaj kua nyeem qaub, acid-resistant cov khoom yuav tsum tau xaiv. Yog tias lawv tau ua haujlwm ib txwm, cov khoom lag luam zoo tuaj yeem txhim kho thiab cov khoom siv nag lossis daus thiab stratification tuaj yeem tiv thaiv tau.
1. Thaum ntxiv cov kua qaub, qhov ntsuas kub ntawm cov acid ntxiv yuav tsum tau nruj me ntsis tswj, feem ntau ≤20 ° C.
2. Tus kua qaub yuav tsum tau tswj hwm ntawm 8-20%, qhov qis dua qhov zoo dua.
3. Cov kua tshuaj txau kom tau txais kev txau txheej txheem, thiab nws yog ntxiv raws txoj kev taw qhia ntawm lub thawv sib txawv, feem ntau 1-3 feeb.
4. Slurry ceev n = 1400-2400r / m
(3) homogeneous
1. Lub hom phiaj ntawm Emulsification
Homogeneous, rog-muaj kua noj, cmc yuav tsum tau compounded nrog ib tug emulsifier, homogenizer siab yog 18-25mpa, thiab qhov kub yog 60-70 ° C.
2. Decentralized lub hom phiaj
Homogenization, yog hais tias muaj ntau yam xyaw ua ke nyob rau hauv thaum ntxov theem tsis yog ib co me me, nws yuav tsum yog homogenization siab yog 10mpa, thiab ntsuas kub yog 60-70 ° C.
(4) kom tsis muaj menyuam
CMC ntawm qhov kub thiab txias, tshwj xeeb tshaj yog thaum qhov ntsuas kub siab dua 50 ° C rau lub sijhawm ntev, lub viscosity ntawm kev ua tsis zoo yuav txo qis itreversibly. Lub viscosity ntawm cmc ntawm cov chaw tsim khoom dav dav yuav tso rau siab ntev ntawm 80 ° C rau 30 feeb, yog li tam sim kom tsis muaj menyuam los yog bar canish siv tau. Kev tsis muaj menyuam txoj kev kom luv luv lub sijhawm ntawm CMC ntawm qhov kub.
(5) Lwm yam kev ceev faj
1. Cov dej uas raug xaiv yuav tsum tau huv thiab kho cov kais dej kom ntau li ntau tau. Dej zoo yuav tsum tsis txhob siv kom tsis txhob muaj mob microbial thiab cuam tshuam cov khoom lag luam zoo.
2. Cov tais diav rau cov yaj thiab khaws cia cmc tsis tuaj yeem siv hauv cov thawv hlau, tab sis cov thawv ntoo steel, lossis cov ntim ntoo tuaj yeem siv. Tiv thaiv qhov infiltration ntawm cov hlau sib dhos ions.
3. Tom qab txhua qhov siv CMC, lub qhov ncauj ntawm lub hnab ntim khoom yuav tsum tau khi kom nruj kom tiv thaiv kev nqus dej noo thiab tsis zoo ntawm CMC.
03
Cov lus teb rau cov lus nug hauv kev siv CMC
Npaum li cas-viscosity, medcos-viscosity, thiab high-viscosity sib txawv? Puas yuav muaj qhov sib txawv hauv kev sib xws?
Teb:
Nws tau to taub tias qhov ntev ntawm cov molecular chart yog txawv, lossis cov molecular hnyav sib txawv, thiab nws tau muab faib ua cov viscosity qis, nruab nrab. Tau kawg, macroscopic kev ua yeeb yam sib raug rau qhov txawv viscosity. Tib lub concentration muaj qhov sib txawv viscosity, cov khoom lag luam ruaj khov thiab acid piv. Kev sib raug zoo ncaj qha yog nyob ntawm kev daws ntawm cov khoom.
Dab tsi yog qhov kev ua yeeb yam ntawm cov khoom lag luam nrog tus degree hloov chaw nyob sab saud 1.15? Hauv lwm lo lus, qib siab dua ntawm qhov kev ua haujlwm tau hloov chaw, kev ua haujlwm tshwj xeeb ntawm cov khoom tau txhim kho?
Teb:
Cov khoom muaj qib siab ntawm kev hloov pauv, nce fundity, thiab txo qis pseudoplastic. Cov khoom lag luam nrog tib hom viscosity muaj qib siab ntawm kev hloov pauv thiab muaj kev nplua ntau qhov kev xav zoo. Cov khoom lag luam nrog cov qib siab ntawm kev hloov pauv tau muaj cov tshuaj ci iab, thaum cov khoom lag luam nrog cov tshuaj dav dav tau muaj cov tshuaj whitish.
Puas yog nws tsis ua li cas los xaiv nruab nrab viscosity kom ua kom cov dej muaj protein?
Teb:
Cov khoom lag luam nruab nrab thiab qis viscosity, cov qib hloov chaw yog li 0.90, thiab cov khoom lag luam nrog cov kua qaub zoo dua.
Yuav ua li cas cmc yaj sai li cas? Qee zaum, tom qab boiling, nws maj mam ploj.
Teb:
Sib tov nrog lwm cov colloids, lossis tawg nrog 1000-1200 rpm agitator.
Qhov kev tawm tsam ntawm CMC tsis zoo, lub hydrophilicity yog qhov zoo, thiab nws yooj yim rau pawg, thiab cov khoom lag luam nrog kev hloov pauv siab dua! Dej sov dissolves sai dua li dej txias. Boiling feem ntau tsis pom zoo. Ntev ua noj ntawm CMC cov khoom yuav rhuav tshem cov qauv molecular thiab cov khoom yuav poob nws viscosity!
Lub Sijhawm Post: Feb-14-2025