Sodium carboxymethyl cellulose (CMC) rau kev txheej ntawv

Sodium carboxymethyl cellulose (CMC)yog ib qho polymer anionic soluble hauv dej uas tau los ntawm kev hloov kho tshuaj raws li cov cellulose ntuj. Nws muaj cov dej zoo solubility, cov khoom ua zaj duab xis, adhesion, thickening thiab suspension stability, thiab yog siv dav hauv ntau qhov txuas ntawm kev lag luam papermaking, tshwj xeeb tshaj yog hauv cov txheej txheem ntawv.

1. Cov kev cai yooj yim rau kev txheej ntawv

Lub hom phiaj tseem ceeb ntawm kev txheej ntawv yog los txhim kho cov khoom ntawm daim ntawv, suav nrog kev du, ci, opacity, nqus kua mem, luam ntawv hloov pauv tau, thiab lwm yam. Cov qauv txheej feem ntau yog tsim los ntawm cov xim (xws li kaolin, calcium carbonate, talc, thiab lwm yam), cov binders (xws li emulsions, starch, CMC, thiab lwm yam) thiab lwm yam additives (xws li dispersants, lubricants, cov neeg sawv cev tiv thaiv dej, thiab lwm yam). Thaum lub sijhawm txheej txheem txheej, qhov ruaj khov thiab fluidity ntawm cov mis txheej thiab cov qauv txheej tom qab ziab ua lub luag haujlwm txiav txim siab hauv qhov zoo ntawm daim ntawv kawg.

2. Lub luag haujlwm ntawm CMC hauv kev txheej ntawv

2.1. Kev ua haujlwm ntawm cov ntawv nplaum

CMC siv tau ua ib qho khoom siv pabcuam rau cov xim, thiab ua haujlwm nrog cov khoom siv tseem ceeb (xws li emulsion, hmoov txhuv nplej siab) los txhim kho qhov lo rau ntawm daim ntawv, yog li ua kom lub tsho tiv no ruaj khov thiab tiv taus tev tawv.

2.2. Cov khoom ua kom tuab thiab rheology regulator

CMC tuaj yeem tsim cov kua colloidal nrog qee qhov viscosity hauv dej, uas tuaj yeem kho cov khoom rheological ntawm cov txheej, txhim kho qhov sib xws thiab ruaj khov ntawm cov txheej thaum lub sijhawm txheej txheem, thiab pab kom tau txais cov tuab txheej sib xws.

2.3. Cov khoom siv kho kom tawg

Ntxiv cov CMC kom tsim nyog rau hauv cov mis txheej tuaj yeem txhim kho qhov kev sib kis ntawm cov xim me me, tiv thaiv cov xim av thiab flocculation, thiab xyuas kom meej tias cov txheej ruaj khov thaum lub sijhawm khaws cia thiab siv.

2.4. Txhim kho kev ua haujlwm ntawm cov txheej txheem

CMC muaj kev ywj pheej zoo thiab zaj duab xis sib xws tom qab tsim zaj duab xis, uas tuaj yeem txhim kho qhov chaw tiaj tus, du thiab luam ntawv hloov pauv tau ntawm cov txheej, tshwj xeeb tshaj yog haum rau cov ntawv coated, coated dawb cardboard, high-qib luam ntawv, thiab lwm yam.

2.5. Kev khaws dej thiab lubricity

CMC tuaj yeem txhim kho lub peev xwm khaws dej ntawm lub txheej, tiv thaiv kev ya raws ntawm cov dej hauv lub txheej hauv qab kev kub ceev lossis qhov chaw qhuav, thiab xyuas kom meej tias cov txheej sib xws; tib lub sijhawm, nws lubricity kuj pab txo cov khoom siv sib txhuam thiab txhim kho kev ua haujlwm ntau lawm.

3. Cov yam ntxwv siv ntawm CMC

3.1. Kev yaj dej zoo heev

CMC yooj yim yaj rau hauv dej txias, yooj yim siv, thiab tuaj yeem npaj tau ncaj qha ntawm chav tsev kub yam tsis muaj cua sov kho.

3.2. Hom viscosity nplua nuj

CMC nrog cov qib viscosity sib txawv yog qhov tsim nyog rau ntau hom ntawv coated thiab cov txheej txheem xav tau. Cov neeg siv tuaj yeem xaiv cov qauv tsim nyog raws li qhov xav tau tiag tiag.

3.3. Kev ruaj khov tshuaj zoo

CMC muaj kev kam rau cua sov, lub teeb, kua qaub thiab alkali, thiab tsis yooj yim rau degrade thiab lwj tom qab siv ntev.

3.4. Zoo rau ib puag ncig thiab tsis muaj tshuaj lom

Ua ib qho cellulose derivative los ntawm cov khoom siv ntuj, CMC tsis muaj tshuaj lom thiab tsis ua rau muaj kev phom sij, uas yog nyob rau hauv txoj kab nrog kev txhim kho kev tiv thaiv ib puag ncig ntsuab hauv kev lag luam papermaking.

4. Cov ntsiab lus tseem ceeb ntawm cov txheej txheem thov

Thaum siv tiag tiag, yuav kom ntseeg tau tias CMC ua lub luag haujlwm zoo tshaj plaws hauv lub txheej txheem txheej, cov ntsiab lus hauv qab no yuav tsum tau sau tseg:

4.1. Txoj kev yaj kom raug

Ua ntej siv CMC, yuav tsum maj mam ntxiv rau hauv dej txias uas kub thiab do kom tsis txhob sib xyaw ua ke thiab ua kom tuab dhau. Yuav tsum ntxiv ua pawg thiab do kom txog thaum yaj tag.

4.2. Kev tswj hwm cov tshuaj kom raug

Feem ntau, qhov ntau ntawm CMC ntxiv yog 0.1% txog 0.5% ntawm qhov hnyav qhuav ntawm cov txheej. Qhov ntau npaum li cas raug kho raws li qhov yuav tsum tau ua haujlwm ntawm cov txheej thiab cov txheej txheem txheej. Ntxiv ntau dhau yuav ua rau cov viscosity ntawm cov txheej siab dhau, cuam tshuam rau kev ua haujlwm ntawm cov txheej.

4.3. Kev sib raug zoo nrog lwm cov khoom ntxiv

CMC yog sib xws nrog ntau yam txheej ntxiv (xws li emulsions, dispersants, preservatives, thiab lwm yam), tab sis yuav tsum tau them sai sai rau nws qhov sib xws nrog cov cationic additives muaj zog kom tiv thaiv flocculation thiab nag lossis daus.

5. Cov piv txwv ntawm daim ntawv thov CMC hauv ntau hom ntawv sib txawv

Daim ntawv coated: siv los txhim kho qhov du thiab ci ntawm lub txheej, thaum txhim kho qhov adhesion ntawm lub txheej;

Daim ntawv dawb: txhim kho kev tiv thaiv folding thiab kev hloov pauv luam ntawv;

Daim ntawv lo thiab daim ntawv thermal: txhim kho qhov sib xws ntawm cov txheej txheem saum npoo thiab kev luam ntawv meej;

Cov ntawv xov xwm coated: txhim kho qhov ruaj khov ntawm cov kua txheej thiab txo qhov tshwm sim ntawm kev nkag mus ntawm cov kua luam ntawv.

Ua ib qho tshuaj polymer ntuj uas muaj kev ua tau zoo heev, sodium carboxymethyl cellulose ua ntau yam haujlwm hauv cov txheej txheem ntawv, xws li kev sib txuas, kev ua kom tuab, kev tawg thiab kev txhim kho cov khoom nto. Nws tus nqi qis, kev ruaj khov zoo thiab kev tiv thaiv ib puag ncig ua rau nws nyob hauv txoj haujlwm tseem ceeb hauv kev lag luam ntawv niaj hnub no. Nrog rau kev txhim kho tas li ntawm cov kev xav tau zoo ntawm daim ntawv thiab kev txhawb nqa cov tswv yim ntawv ntsuab,CMC yuav txuas ntxiv mus ua si ntau daim ntawv thov muaj peev xwm hauv thaj teb ntawm cov ntawv coatings.