Carboxymethyl cellulose (Carboxy Methyl Cellulose, CMC) yog ether derivative ntawm natural cellulose.Nws yog dawb los yog daj me ntsis hmoov.Nws yog ib qho dej-soluble anionic surfactant.Nws tsis muaj ntxhiab, tsis qab, tsis muaj tshuaj lom, thiab muaj dej solubility zoo heev., Viscosity, emulsification, diffusion, enzyme kuj, stability thiab ib puag ncig tus phooj ywg, CMC yog dav siv nyob rau hauv papermaking, textile, printing thiab dyeing, roj av, ntsuab ua liaj ua teb thiab polymer teb.Hauv kev lag luam ntawv, CMC tau siv dav hauv cov neeg ua haujlwm loj thiab cov nplaum nplaum rau ntau xyoo, tab sis nws tsis tau tsim zoo thiab siv los ua cov ntaub ntawv ntub-kawg ntxiv dag zog.
Qhov saum npoo ntawm cellulose yog tsis zoo them, yog li ntawd, anionic polyelectrolytes feem ntau tsis adsorb nws.Txawm li cas los xij, cov kev tshawb fawb tau pom tias CMC tuaj yeem txuas rau saum npoo ntawm cov tshuaj chlorine-free bleaching (ECF) pulp, uas tuaj yeem ua rau kom muaj zog ntawm daim ntawv;Tsis tas li ntawd, CMC kuj yog ib qho dispersant, uas tuaj yeem txhim kho qhov tawg ntawm fibers hauv kev ncua, yog li nqa daim ntawv sib npaug.Kev txhim kho ntawm cov degree kuj ua rau lub cev muaj zog ntawm daim ntawv;Tsis tas li ntawd, pawg carboxyl ntawm CMC yuav tsim ib daim ntawv cog lus hydrogen nrog cov pab pawg hydroxyl ntawm cov cellulose ntawm cov fiber ntau kom muaj zog ntawm daim ntawv.Lub zog ntawm cov ntaub ntawv txhawb zog yog cuam tshuam rau qib thiab kev faib tawm ntawm CMC adsorption ntawm fiber ntau, thiab lub zog thiab kev faib tawm ntawm CMC adsorption ntawm fiber ntau muaj feem xyuam rau qib kev hloov pauv (DS) thiab qib ntawm polymerization (DP) ntawm CMC;tus nqi, ntaus degree, thiab pH ntawm fiber ntau, lub zog ionic ntawm nruab nrab, thiab lwm yam yuav cuam tshuam rau tus nqi adsorption ntawm CMC ntawm fiber ntau, yog li cuam tshuam rau lub zog ntawm daim ntawv.
Daim ntawv no tsom mus rau kev cuam tshuam ntawm CMC ntub-kawg ntxiv txheej txheem thiab nws cov yam ntxwv ntawm daim ntawv muaj zog txhim kho, txhawm rau txheeb xyuas cov peev txheej ntawm CMC raws li cov ntaub ntawv ntub-kawg ntxiv dag zog, thiab muab lub hauv paus rau daim ntawv thov thiab kev sib txuas ntawm CMC nyob rau hauv lub papermaking ntub-kawg.
1. Kev npaj CMC kev daws teeb meem
Ua kom raug hnyav 5.0 g ntawm CMC (qhuav qhuav, hloov mus rau CMC ntshiab), maj mam ntxiv rau 600ml (50 ° C) cov dej distilled hauv qab nplawm (500r / min), txuas ntxiv (20min) kom txog thaum cov tshuaj ntshiab, thiab cia nws. Txias mus rau hauv chav tsev kub, siv 1L ntim ntim rau qhov ntim tas li los npaj CMC aqueous tov nrog ib qho concentration ntawm 5.0g / L, thiab cia nws sawv hauv qhov chaw txias ntawm chav tsev kub rau 24 teev tom qab siv.
Xav txog qhov tseeb daim ntawv thov kev lag luam (nruab nrab papermaking) thiab CMC txhim kho cov nyhuv, thaum pH yog 7.5, qhov tensile Performance index, tawg index, kua muag index thiab folding endurance ntawm daim ntawv yog feem ntau nce los ntawm 16.4 txheeb ze rau qhov sib thooj ntawm lub zog ntawm cov khoom seem. qauv.%, 21.0%, 13.2% thiab 75%, nrog pom tseeb cov ntawv txhim kho.Xaiv pH 7.5 raws li tus nqi pH rau tom ntej CMC ntxiv.
2. Cov nyhuv ntawm CMC ntau npaum li cas ntawm daim ntawv txhim kho
Ntxiv NX-800AT carboxymethyl cellulose, qhov ntau npaum yog 0.12%, 0.20%, 0.28%, 0.36%, 0.44% (rau cov tawv nqaij qhuav).Raws li tib yam li lwm yam kev mob, qhov dawb paug tsis ntxiv CMC tau siv los ua tus qauv tswj.
Thaum CMC cov ntsiab lus yog 0.12%, cov txiaj ntsig tau pom tias qhov tensile Performance index, tawg index, tsim kua muag Performance index thiab folding lub zog ntawm daim ntawv yog nce los ntawm 15.2%, 25.9%, 10.6% thiab 62.5% feem ntau piv nrog cov qauv dawb paug.Nws tuaj yeem pom tau tias xav txog qhov muaj tseeb ntawm kev lag luam, qhov zoo tshaj plaws txhim kho cov nyhuv tseem tuaj yeem tau txais thaum qhov tsawg ntawm CMC (0.12%) raug xaiv.
3. Cov nyhuv ntawm CMC molecular hnyav ntawm daim ntawv ua kom muaj zog
Raws li qee qhov xwm txheej, qhov viscosity ntawm CMC kuj sawv cev rau qhov loj ntawm nws qhov hnyav molecular, uas yog, qib ntawm polymerization.Ntxiv CMC rau daim ntawv tso tawm, qhov viscosity ntawm CMC muaj qhov cuam tshuam loj rau kev siv.
Ntxiv 0.2% NX-50AT, NX-400AT, NX-800AT carboxymethyl cellulose xeem cov txiaj ntsig, qhov viscosity yog 0 txhais tau tias tsis muaj qauv.
Thaum lub viscosity ntawm CMC yog 400 ~ 600mPa•s, qhov sib ntxiv ntawm CMC tuaj yeem ua tiav cov txiaj ntsig zoo.
4. Qhov cuam tshuam ntawm qib kev hloov pauv ntawm lub zog ntawm CMC-txhim kho daim ntawv
Qhov kev hloov pauv ntawm CMC ntxiv rau qhov kawg ntub yog tswj ntawm 0.40 thiab 0.90.Qhov siab dua qhov kev hloov pauv, qhov zoo dua qhov hloov pauv qhov sib xws thiab solubility, thiab qhov sib txawv ntawm cov fiber ntau, tab sis tus nqi tsis zoo kuj nce ntxiv, uas yuav cuam tshuam rau kev sib xyaw ntawm CMC thiab fiber ntau [11].Ntxiv 0.2% ntawm NX-800 thiab NX-800AT carboxymethyl cellulose nrog tib viscosity feem, cov txiaj ntsig tau pom hauv daim duab 4.
Lub zog tawg, lub zog tsim kua muag, thiab lub zog folding tag nrho txo nrog qhov nce ntawm CMC hloov pauv qib, thiab ncav cuag qhov siab tshaj plaws thaum hloov pauv qib yog 0.6, uas feem ntau nce los ntawm 21.0%, 13.2%, thiab 75% piv nrog cov qauv dawb.Hauv kev sib piv, CMC nrog rau qib ntawm kev hloov pauv ntawm 0.6 yog qhov tsim nyog rau kev txhim kho cov ntawv muaj zog.
5 Kev xaus
5.1 Lub pH ntawm slurry ntub dej kawg system muaj ib qho tseem ceeb cuam tshuam rau lub zog ntawm CMC-txhim ntawv daim ntawv.Thaum pH nyob rau hauv thaj tsam ntawm 6.5 txog 8.5, qhov sib ntxiv ntawm CMC tuaj yeem ua kom muaj zog ntxiv, thiab CMC ntxiv dag zog yog tsim rau nruab nrab papermaking.
5.2 Tus nqi ntawm CMC muaj kev cuam tshuam zoo rau kev ntxiv dag zog ntawm CMC daim ntawv.Nrog rau qhov nce ntawm CMC cov ntsiab lus, lub zog tensile, bursting tsis kam thiab tsim kua muag lub zog ntawm daim ntawv ntawv nce ua ntej thiab ces tended yuav kuj ruaj khov, thaum lub folding endurance pom ib tug qauv ntawm nce ua ntej thiab tom qab ntawd txo.Thaum cov koob tshuaj yog 0.12%, qhov pom tseeb ntawm daim ntawv ntxiv dag zog tuaj yeem tau txais.
Qhov hnyav molecular ntawm 5.3CMC kuj tseem muaj kev cuam tshuam loj rau kev txhawb zog ntawm daim ntawv.CMC nrog viscosity ntawm 400-600mPa·s tuaj yeem ua tiav cov ntawv zoo ntxiv.
5.4 Qhov kev hloov pauv ntawm CMC muaj feem cuam tshuam rau kev ua kom muaj zog ntawm daim ntawv.CMC nrog qhov hloov pauv qib ntawm 0.6 thiab 0.9 tuaj yeem pom tseeb txhim kho cov ntawv muaj zog.Kev txhim kho ntawm CMC nrog kev hloov pauv qib ntawm 0.6 yog qhov zoo dua li ntawm CMC nrog kev hloov pauv qib ntawm 0.9.
Post lub sij hawm: Jan-28-2023