Carboxymethyl cellulose kulimbikitsidwa

Carboxymethyl cellulose (Carboxy Methyl Cellulose, CMC) ndi ether yochokera ku cellulose yachilengedwe.Ndi ufa woyera kapena wachikasu pang'ono.Ndi madzi osungunuka anionic surfactant.Ndi yopanda fungo, yosakoma, yopanda poizoni, ndipo imasungunuka kwambiri m'madzi., Viscosity, emulsification, diffusion, kukana kwa enzyme, kukhazikika ndi kuyanjana kwa chilengedwe, CMC imagwiritsidwa ntchito kwambiri popanga mapepala, nsalu, kusindikiza ndi utoto, mafuta, ulimi wobiriwira ndi minda ya polima.M'makampani opanga mapepala, CMC yakhala ikugwiritsidwa ntchito kwambiri popanga zomata komanso zomatira kwazaka zambiri, koma siyinapangidwe bwino ndikugwiritsidwa ntchito ngati chopangira chonyowa cholimbitsa mapepala.

Pamwamba pa cellulose imakhala yoyipa kwambiri, chifukwa chake, ma polyelectrolytes anionic nthawi zambiri samawatsatsa.Komabe, kafukufuku wasonyeza kuti CMC akhoza Ufumuyo pamwamba pa elemental chlorine-free bleaching (ECF) zamkati, amene akhoza kuwonjezera mphamvu ya pepala;Komanso, CMC ndi dispersant, amene angathe kusintha kubalalitsidwa kwa ulusi mu kuyimitsidwa, potero kubweretsa pepala evenness.Kuwongolera kwa digiri kumawonjezeranso mphamvu yakuthupi ya pepala;Komanso, gulu la carboxyl pa CMC lidzapanga mgwirizano wa haidrojeni ndi gulu la hydroxyl la cellulose pa fiber kuti liwonjezere mphamvu ya pepala.Mphamvu ya pepala lolimbikitsidwa limagwirizana ndi digiri ndi kugawa kwa CMC adsorption pamtunda wa fiber, ndipo mphamvu ndi kugawa kwa CMC adsorption pamtunda wa fiber zimagwirizana ndi digiri ya kulowetsa (DS) ndi digiri ya polymerization (DP) CMC;mlandu, kumenya digiri, ndi pH wa CHIKWANGWANI , mphamvu ya ayoni ya sing'anga, etc. zonse zidzakhudza adsorption kuchuluka kwa CMC pamwamba CHIKWANGWANI, motero zimakhudza mphamvu ya pepala.

Pepalali limayang'ana kwambiri pa mphamvu ya CMC yowonjezera-mapeto owonjezera ndi mawonekedwe ake pakukweza mphamvu zamapepala, kuti athe kuwunika momwe CMC ingagwiritsire ntchito ngati chopangira mapepala, ndikupereka maziko ogwiritsira ntchito ndi kaphatikizidwe ka CMC. mu kupanga mapepala kunyowa-mapeto.

1. Kukonzekera yankho la CMC

Yeretsani molondola 5.0 g ya CMC (youma mtheradi, yosinthidwa kukhala CMC yoyera), onjezerani pang'onopang'ono ku 600ml (50 ° C) madzi osungunuka ndikugwedeza (500r / min), pitirizani kuyambitsa (20min) mpaka yankho likuwonekera bwino, ndipo mulole kuziziritsa mpaka kutentha kwa chipinda , gwiritsani ntchito botolo la voliyumu ya 1L ku voliyumu yokhazikika kuti mukonzekere yankho lamadzi la CMC lokhala ndi ndende ya 5.0g/L, ndipo muyime pamalo ozizira kutentha kwa maola 24 kuti mugwiritse ntchito mtsogolo.

Poganizira ntchito yeniyeni ya mafakitale (kupanga mapepala osalowerera ndale) ndi kupititsa patsogolo kwa CMC, pamene pH ili 7.5, index yokhazikika, index yophulika, misozi ndi kupindika kupirira kwa pepala zimachulukitsidwa ndi 16.4 poyerekeza ndi mphamvu yofanana ya kulamulira kopanda kanthu. chitsanzo.%, 21.0%, 13.2% ndi 75%, ndi zotsatira zoonekeratu zowonjezera mapepala.Sankhani pH 7.5 monga pH mtengo wotsatira wa CMC kuwonjezera.

2. Mmene CMC mlingo pa pepala kuwongola

Onjezani NX-800AT carboxymethyl cellulose, mlingo ndi 0.12%, 0.20%, 0.28%, 0.36%, 0.44% (kwa zamkati zouma kwathunthu).Pansi pazikhalidwe zina zomwezo, zopanda kanthu popanda kuwonjezera CMC zidagwiritsidwa ntchito ngati chitsanzo chowongolera.

Pamene CMC zili 0,12%, zotsatira zimasonyeza kuti kumangika index, kuphulika index, misozi index ndi kupukusa mphamvu ya pepala chiwonjezeke ndi 15.2%, 25.9%, 10,6% ndi 62.5% motero poyerekeza ndi kanthu chitsanzo.Zitha kuwoneka kuti poganizira zenizeni zamafakitale, kuwongolera koyenera kumatha kupezekabe pomwe mlingo wochepa wa CMC (0.12%) wasankhidwa.

3. Zotsatira za CMC molekyulu kulemera pa pepala kulimbikitsa pepala

Pazifukwa zina, kukhuthala kwa CMC kumayimira kukula kwa kulemera kwake, ndiko kuti, digiri ya polymerization.Powonjezera CMC pakuyimitsidwa kwazinthu zamapepala, kukhuthala kwa CMC kumakhudza kwambiri kugwiritsa ntchito.

Onjezani 0.2% NX-50AT, NX-400AT, NX-800AT zotsatira za mayeso a carboxymethyl cellulose motsatana, kukhuthala kwake ndi 0 kumatanthauza zitsanzo zopanda kanthu.

Pamene kukhuthala kwa CMC ndi 400～600mPa•s, kuwonjezera kwa CMC kumatha kukwaniritsa bwino kulimbikitsa.

4. Zotsatira za digiri ya kusintha pa mphamvu ya CMC-wowonjezera pepala

Mlingo wolowa m'malo mwa CMC wowonjezedwa kumapeto konyowa umayendetsedwa pakati pa 0.40 ndi 0.90.Kukwera kwa kuchuluka kwa kulowetsa m'malo, kumapangitsanso kusinthana kwabwinoko komanso kusungunuka, komanso kuyanjana kofananira ndi ulusi, koma chiwopsezo choyipa chimawonjezekanso molingana, zomwe zingakhudze kuphatikizana pakati pa CMC ndi CHIKWANGWANI [11].Onjezani 0.2% ya NX-800 ndi NX-800AT carboxymethyl cellulose yokhala ndi mamasukidwe omwewo motsatana, zotsatira zikuwonetsedwa Chithunzi 4.

Kuphulika kwamphamvu, kung'amba mphamvu, ndi mphamvu zopinda zonse zimachepa ndi kuwonjezeka kwa digiri ya CMC yolowa m'malo, ndikufika pazipita pamene digirii yolowa m'malo ndi 0.6, yomwe ikuwonjezeka ndi 21.0%, 13.2%, ndi 75% poyerekeza ndi chitsanzo chopanda kanthu.Poyerekeza, CMC yokhala ndi digiri ya 0.6 m'malo mwake imathandizira kukulitsa mphamvu zamapepala.

5 Mapeto

5.1 pH ya slurry wet end system imakhala ndi chikoka chofunikira pa mphamvu ya pepala lolimbikitsidwa ndi CMC.Pamene pH ili pamtunda wa 6.5 mpaka 8.5, kuwonjezera kwa CMC kungakhale ndi mphamvu yolimbikitsa, ndipo kulimbitsa CMC ndikoyenera kupanga mapepala osalowerera ndale.

5.2 Kuchuluka kwa CMC kumakhudza kwambiri kulimbikitsa mapepala a CMC.Ndi kuchuluka kwa zomwe zili mu CMC, kulimba kwamphamvu, kukana kuphulika ndi kung'ambika kwa pepala kunakula koyamba ndiyeno kumakhala kokhazikika, pomwe kupirira kwapang'onopang'ono kumawonetsa chizolowezi chowonjezeka choyamba kenako ndikuchepera.Pamene mlingo uli 0.12%, zotsatira zomveka zolimbitsa mapepala zimatha kupezeka.

Kulemera kwa mamolekyu a 5.3CMC kumathandizanso kwambiri pakulimbikitsa kwa pepala.CMC yokhala ndi mamasukidwe a 400-600mPa·s imatha kukwaniritsa kulimbitsa bwino kwa mapepala.

5.4 Mlingo wa kusintha kwa CMC kumakhudza kulimbikitsa kwa pepala.The CMC ndi digiri m'malo 0.6 ndi 0.9 akhoza mwachionekere kusintha pepala mphamvu ntchito.Kupititsa patsogolo kwa CMC yokhala ndi digiri ya 0.6 ndikwabwino kuposa ya CMC yokhala ndi digiri ya 0.9.