CMC rau daim ntawv txheej

Sodium Carboxymethyl Cellulose (CMC)yog ib qho tseem ceeb hauv dej-soluble polymer compound, uas yog dav siv hauv papermaking, textile, khoom noj, tshuaj, tshuaj txhua hnub thiab lwm yam teb. Hauv kev lag luam papermaking, tshwj xeeb tshaj yog hauv daim ntawv txheej (txheej), CMC tau dhau los ua ib qho ntawm cov khoom siv txheej tseem ceeb vim nws cov khoom zoo-ua zaj duab xis, adhesion, dispersibility thiab rheological zog.

1. Cov khoom yooj yim ntawm CMC

CMC yog ib qho anionic cellulose ether ua los ntawm kev qhia cov carboxymethyl pawg rau hauv cov cellulose molecules raws li cov cellulose ntuj los ntawm cov txheej txheem tshuaj lom neeg. Nws yog ib qho hmoov dawb lossis me ntsis daj, yooj yim soluble hauv dej txias, thiab tsim cov kua viscous pob tshab. Cov kev ua tau zoo tseem ceeb ntawm CMC suav nrog qib kev hloov pauv (DS), viscosity, purity, thiab lwm yam, ntawm cov qib kev hloov pauv feem ntau yog ntawm 0.4 thiab 1.4. Qhov siab dua qib kev hloov pauv, qhov zoo dua qhov dej solubility ntawm CMC; qhov viscosity txiav txim siab rheological cov khoom thiab cov sijhawm siv ntawm nws cov tshuaj.

2. Lub luag haujlwm ntawm CMC hauv kev txheej ntawv

Txheej ntawv txhais tau tias yog kev siv ib txheej txheej uas muaj cov xim thiab cov khoom khi rau ntawm qhov chaw ntawm daim ntawv los txhim kho kev ua tau zoo ntawm kev luam ntawv, ci ntsa iab, du thiab zais lub zog ntawm daim ntawv. Ua ib qho khoom siv ntxiv rau hauv cov mis txheej, CMC muaj cov haujlwm tseem ceeb hauv qab no:

Cov tshuaj yaj tawm:CMC muaj kev sib kis zoo thiab tuaj yeem ua kom cov xim inorganic xws li kaolin, calcium carbonate, hmoov talcum, thiab lwm yam tawg tau zoo hauv cov txheej txheej kom tiv thaiv cov xim flocculation thiab nag lossis daus, yog li txhim kho kev ruaj khov ntawm cov txheej txheej.

Cov Ntawv Txuas:CMC tuaj yeem txhim kho lub zog khi ntawm cov xim hauv cov txheej thiab ntawm cov xim thiab cov ntawv fibers, thiab txhim kho lub zog ntawm cov qauv thiab kev hnav tsis kam ntawm cov txheej.

Cov Khoom Ua Kom Tuab:CMC aqueous kua muaj ib tug siab viscosity thiab yuav kho tau cov rheological zog ntawm lub txheej, yog li ntawd nws muaj zoo fluidity, kis thiab ncua kev kawm ntawv thaum lub sij hawm lub txheej txheem.

Cov khoom tsim ua yeeb yaj kiab:CMC tuaj yeem tsim ib zaj duab xis sib xws tom qab ziab rau ntawm qhov chaw ntawm daim ntawv, txhim kho qhov du thiab ci ntawm cov txheej, thiab txhim kho qhov meej ntawm cov duab luam tawm.

Kev ua kom lubricity thiab plua plav tsis kam:CMC tuaj yeem txhim kho qhov lubricity ntawm lub txheej, txo cov khoom siv kho tshuab, tiv thaiv cov hmoov av tsim, thiab txhim kho qhov zoo ntawm qhov chaw tsim khoom.

3. Kev siv thiab kev ceev faj

Hauv daim ntawv thov txheej txheem ntawv, muaj cov hauv qab no rau kev siv CMC:

Ntxiv ncaj qha ua ib feem ntawm txheej: Yaj CMC hmoov qhuav hauv dej kom npaj tau qee qhov concentration ntawm cov kua dej (feem ntau 1% -5%), tom qab ntawd ntxiv rau txheej thiab do kom sib npaug.

Siv ua ke nrog lwm cov binders: Txhawm rau kom ua tau zoo dua ntawm cov txheej txheem, CMC feem ntau siv ua ke nrog latex (xws li styrene-butadiene latex, ethylene-vinyl acetate emulsion, thiab lwm yam) los ua lub luag haujlwm synergistic.

Kho qhov kev tswj viscosity: Cov ntawv sib txawv thiab cov khoom siv txheej muaj cov kev cai sib txawv rau qhov viscosity txheej. Qhov kev ua tau zoo xav tau tuaj yeem ua tiav los ntawm kev xaiv CMC ntawm cov qib viscosity sib txawv lossis kho qhov ntxiv.

Cov kev ceev faj suav nrog:

Tsis txhob sib sau ua ke thaum yaj CMC. Siv dej sov los maj mam ntxiv thiab do;

Tsis txhob kov cov kua qaub thiab alkalis ntev ntev kom tsis txhob puas tsuaj;

Khaws qhov chaw cia khoom kom qhuav kom tiv thaiv tau cov dej noo thiab sib sau ua ke.

4. Cov nyhuv ntawm daim ntawv thov CMC hauv daim ntawv coated

Tom qab siv CMC, tag nrho cov ntsuas kev ua tau zoo ntawm daim ntawv txheej tau zoo dua qub:

Kev du thiab ci ntsa iab ntawm qhov chaw tau zoo dua;

Kev sib npaug ntawm txheej yog txhim kho;

Kev luam tawm duab meej dua thiab kev luam ntawv tau zoo dua;

Daim ntawv tawv, lub zog tensile thiab kev tiv thaiv folding tau zoo dua;

Tus nqi ntawm cov txheej txheem sedimentation txo qis thiab kev ruaj khov ntawm kev khaws cia tau zoo dua.

CMCyog ib yam khoom ntsuab thiab ib puag ncig zoo uas ua tau raws li qhov yuav tsum tau ua ntawm kev lag luam niaj hnub no rau kev txhim kho kom ruaj khov.

5. Kev loj hlob sib txawv

Nrog rau kev txhim kho tas mus li ntawm cov kev xav tau zoo rau cov ntawv coated zoo xws li ntawv coated, cardboard, daim ntawv lo, thiab lwm yam, kev hloov kho kev ua tau zoo thiab kev siv CMC tau dhau los ua qhov chaw tshawb fawb tseem ceeb. Yav tom ntej, los ntawm kev sib xyaw nrog cov ntaub ntawv ua haujlwm tshiab xws li nanomaterials thiab biopolymers, nws xav tias yuav txhim kho qib kev siv CMC hauv kev txheej ntawv.