CMC (carboxymethyl cellulose) hauv kev lag luam ua ntawv yog ib qho khoom siv tseem ceeb uas siv los txhim kho qhov zoo thiab kev ua tau zoo ntawm daim ntawv. CMC yog ib qho polymer compound uas yaj tau hauv dej nrog cov yam ntxwv zoo ntawm kev hloov kho viscosity thiab ua lub luag haujlwm tseem ceeb hauv kev ua ntawv.
1. Cov khoom yooj yim ntawm CMC
CMC yog ib qho derivative ntawm cellulose, uas yog ua los ntawm reacting lub hydroxyl ib feem ntawm cellulose nrog chloroacetic acid. Nws muaj zoo heev solubility dej thiab viscosity adjustment peev xwm. CMC tsim ib tug viscous kua tom qab yaj nyob rau hauv dej, uas ua rau nws muaj txiaj ntsig zoo rau ntau yam kev siv industrial.
2. Lub luag haujlwm ntawm CMC hauv kev lag luam ntawv
Hauv cov txheej txheem ua ntawv, CMC feem ntau yog siv ua cov nplaum, cov khoom ua kom tuab thiab cov khoom ruaj khov. Nws cov haujlwm suav nrog:
2.1 Txhim kho lub zog ntawm daim ntawv
CMC tuaj yeem ua kom daim ntawv sib koom ua ke thiab nruj dua, thiab txhim kho qhov tsis kam ntawm daim ntawv thiab kev zawm. Nws txoj hauv kev ua haujlwm yog ua kom daim ntawv tawv dua thiab ruaj khov dua los ntawm kev txhim kho lub zog sib txuas ntawm cov fibers pulp.
2.2 Txhim kho qhov ci ntsa iab thiab qhov du ntawm daim ntawv
Ntxiv CMC tuaj yeem ua rau daim ntawv zoo dua thiab ua rau daim ntawv du dua. Nws tuaj yeem ua kom tiav qhov sib txawv ntawm daim ntawv thiab txo qhov roughness ntawm daim ntawv, yog li ua kom daim ntawv ci thiab luam ntawv yooj yim hloov pauv.
2.3 Tswj cov viscosity ntawm pulp
Thaum lub sijhawm ua ntawv, CMC tuaj yeem tswj tau qhov viscosity ntawm pulp thiab xyuas kom meej tias cov kua thiab sib xws ntawm pulp. Qhov viscosity tsim nyog pab faib cov pulp kom sib npaug, txo cov ntawv tsis zoo, thiab txhim kho kev ua haujlwm ntau lawm.
2.4 Txhim kho qhov kev khaws cia dej ntawm cov pulp
CMC muaj peev xwm khaws dej zoo thiab tuaj yeem txo qhov dej poob ntawm cov pulp thaum lub sijhawm molding. Qhov no tuaj yeem txo qhov shrinkage ntawm daim ntawv thiab cov teeb meem deformation uas tshwm sim thaum lub sijhawm ziab, yog li txhim kho qhov ruaj khov ntawm daim ntawv.
3. Kev kho qhov viscosity ntawm CMC
Qhov viscosity ntawm CMC yog ib qho tseem ceeb rau nws cov nyhuv hauv cov txheej txheem ua ntawv. Raws li cov kev cai tsim khoom sib txawv, qhov viscosity ntawm CMC tuaj yeem hloov kho los ntawm kev hloov kho nws qhov concentration thiab qhov hnyav molecular. Tshwj xeeb:
3.1 Cov nyhuv ntawm qhov hnyav molecular
Qhov hnyav molecular ntawm CMC muaj qhov cuam tshuam ncaj qha rau nws cov viscosity. CMC nrog qhov hnyav molecular loj dua feem ntau muaj viscosity siab dua, yog li qhov hnyav molecular siab CMC yog siv rau hauv cov ntawv thov uas xav tau viscosity siab. Qhov hnyav molecular qis CMC yog qhov tsim nyog rau cov sijhawm uas xav tau viscosity qis dua.
3.2 Cov nyhuv ntawm qhov concentration ntawm cov tshuaj
Qhov concentration ntawm CMC kua kuj yog ib qho tseem ceeb uas cuam tshuam rau viscosity. Feem ntau, qhov concentration ntawm CMC kua ntau dua, nws qhov viscosity ntau dua. Yog li ntawd, thaum tsim khoom tiag tiag, qhov concentration ntawm CMC kua yuav tsum tau kho raws li qhov yuav tsum tau ua kom tiav qib viscosity xav tau.
4. Cov kev ceev faj rau kev siv CMC
Thaum siv CMC hauv cov txheej txheem ua ntawv, cov ntsiab lus hauv qab no yuav tsum tau sau tseg:
4.1 Qhov sib piv tseeb
Qhov ntau ntawm CMC ntxiv yuav tsum tau kho raws li qhov yuav tsum tau ua ntawm daim ntawv. Yog tias ntxiv ntau dhau, nws yuav ua rau lub pulp viscosity siab dhau thiab cuam tshuam rau cov txheej txheem ntau lawm; yog tias tsis txaus, qhov tshwm sim xav tau yuav tsis ua tiav.
4.2 Kev tswj cov txheej txheem yaj
CMC yuav tsum tau yaj rau hauv dej txias kom tsis txhob lwj thaum lub sijhawm cua sov. Cov txheej txheem yaj yuav tsum tau do kom tag nrho kom ntseeg tau tias CMC yaj tag thiab tsis txhob sib sau ua ke.
4.3 Cov nyhuv ntawm tus nqi pH
Qhov kev ua tau zoo ntawm CMC yuav raug cuam tshuam los ntawm tus nqi pH. Hauv kev tsim ntawv, yuav tsum tswj kom muaj pH ntau yam kom ntseeg tau tias CMC muaj txiaj ntsig zoo tshaj plaws.
CMC ua lub luag haujlwm tseem ceeb hauv kev lag luam ua ntawv, thiab nws lub peev xwm hloov kho viscosity cuam tshuam ncaj qha rau qhov zoo thiab kev ua tau zoo ntawm daim ntawv. Los ntawm kev xaiv thiab siv CMC kom raug, lub zog, gloss, du thiab kev ua haujlwm ntawm daim ntawv tuaj yeem txhim kho tau zoo heev. Txawm li cas los xij, thaum siv tiag tiag, qhov concentration thiab viscosity ntawm CMC yuav tsum tau hloov kho kom raug raws li qhov yuav tsum tau ua tshwj xeeb kom ntseeg tau tias nws cov txiaj ntsig zoo tshaj plaws.
Lub sijhawm tshaj tawm: Lub Yim Hli-13-2024