I-Carboxymethyl cellulose (iCarboxy Methyl Cellulose, CMC) yi-ether ephuma kwi-cellulose yendalo.Ngumgubo omhlophe okanye omthubi kancinane.Yi-anionic surfactant enyibilikayo emanzini.Ayinavumba, ayinancasa, ayinatyhefu, kwaye inonyibiliko olubalaseleyo lwamanzi., I-Viscosity, i-emulsification, i-diffusion, ukumelana ne-enzyme, ukuzinza kunye nobuhlobo bendalo, i-CMC isetyenziswa ngokubanzi kwi-papermaking, textile, printing and dyeing, petroleum, ezolimo eziluhlaza kunye neendawo zepolymer.Kushishino lwamaphepha, i-CMC isetyenziswe ngokubanzi kwiiarhente zokulinganisa umphezulu kunye nezinto zokuncamathelisa zokuncamathelisa iminyaka emininzi, kodwa ayiphuhliswanga kakuhle kwaye isetyenziswe njenge-agent yokuqinisa isiphelo somanzi.
Umphezulu we-cellulose uhlawuliswa kakubi, ngoko ke, i-anionic polyelectrolytes ngokuqhelekileyo ayibhengezi.Nangona kunjalo, uphando lubonise ukuba i-CMC inokudityaniswa kumphezulu we-elemental chlorine-free bleaching (ECF) pulp, enokunyusa amandla ephepha;Ukongeza, i-CMC ikwayi-dispersant, enokuthi iphucule ukusasazwa kwemicu yokumiswa, ngaloo ndlela izise ukulingana kwephepha.Ukuphuculwa kwesidanga nako kwandisa amandla omzimba wephepha;ngaphezu koko, iqela le-carboxyl kwi-CMC liya kwenza i-hydrogen bond kunye neqela le-hydroxyl ye-cellulose kwi-fiber ukwandisa amandla ephepha.Amandla ephepha eliqinisiweyo lihambelana neqondo kunye nokusabalalisa kwe-CMC ye-adsorption kwi-fiber surface, kwaye amandla kunye nokusabalalisa kwe-CMC ye-adsorption kwi-fiber surface ihambelana neqondo lokutshintshwa (DS) kunye ne-polymerization degree (DP) yeCMC;intlawulo, idigri yokubetha, kunye ne-pH yefayibha, amandla e-ionic ye-medium, njl. njl. zonke ziya kuchaphazela isixa se-adsorption ye-CMC kumphezulu wefayibha, ngaloo ndlela ichaphazela amandla ephepha.
Eli phepha lijolise kwimpembelelo yenkqubo yokongeza isiphelo esimanzi se-CMC kunye neempawu zayo ekwandiseni amandla ephepha, ukuze kuvavanywe amandla esicelo se-CMC njengephepha lokwenza i-ejenti yokomeleza isiphelo somanzi, kunye nokubonelela ngesiseko sokusetyenziswa kunye nokuhlanganiswa kwe-CMC. kwi-papermaking emanzi-ekupheleni.
1. Ukulungiswa kwesisombululo seCMC
Uyilinganise ngokuchanekileyo i-5.0 g ye-CMC (yomile ngokupheleleyo, iguqulelwe kwi-CMC ecocekileyo), yongeza ngokucothayo kwi-600ml (50 ° C) amanzi adibeneyo phantsi kokuvuselela (500r / min), qhubeka uvuselela (20min) de isisombululo sicace, kwaye usivumele. pholisa phantsi kwiqondo lokushisa, sebenzisa i-flask ye-volumetric ye-1L ukuya kwivolumu eqhubekayo ukulungiselela isisombululo samanzi se-CMC kunye noxinzelelo lwe-5.0g / L, kwaye uvumele ukuba ume kwindawo epholileyo kwiqondo lokushisa kweeyure ezingama-24 ukuze usetyenziswe kamva.
Ukuqwalasela usetyenziso lwezoshishino lwenyani (i-papermaking engathathi hlangothi) kunye nesiphumo sokuphucula i-CMC, xa i-pH iyi-7.5, i-tensile index, isalathisi sokugqabhuka, isalathisi sokukrazula kunye nokunyamezela ukugoqa kwephepha ngokulandelelanayo kwandiswe nge-16.4 ngokumalunga namandla ahambelanayo olawulo olungenanto. isampuli.I-%, 21.0%, 13.2% kunye ne-75%, kunye nesiphumo esicacileyo sokwandiswa kwephepha.Khetha i-pH 7.5 njengexabiso le-pH lokongeza kwi-CMC elandelayo.
2. Impembelelo yedosi ye-CMC kuphuculo lwamaphepha
Yongeza i-NX-800AT carboxymethyl cellulose, i-dosage yi-0.12%, 0.20%, 0.28%, 0.36%, 0.44% (ye-pulp eyomileyo ngokupheleleyo).Ngaphantsi kwezinye iimeko ezifanayo, i-blank ngaphandle kokongeza i-CMC isetyenziswe njengesampuli yokulawula.
Xa umxholo we-CMC u-0.12%, iziphumo zibonisa ukuba i-index tensile, i-index yokugqabhuka, isalathisi sokukrazula kunye namandla okugoqa kwiphepha lephepha zanda nge-15.2%, 25.9%, 10.6% kunye ne-62.5% ngokulandelanayo xa kuthelekiswa nesampuli engenanto.Ingabonwa ukuba kuthathelwa ingqalelo ubunyani boshishino, isiphumo esisiso sokuphucula sinokufumaneka xa idosi ephantsi ye-CMC (0.12%) ikhethiwe.
3. Isiphumo se-CMC sobunzima bemolekyuli ekomelezeni amaphepha ephepha
Phantsi kweemeko ezithile, i-viscosity ye-CMC imele ubukhulu bobunzima bayo bemolekyuli, oko kukuthi, iqondo lepolymerization.Ukongeza i-CMC ekumisweni kwesitokhwe sephepha, i-viscosity ye-CMC inempembelelo ebalulekileyo kwisiphumo sokusetyenziswa.
Yongeza i-0.2% i-NX-50AT, i-NX-400AT, i-NX-800AT iziphumo zovavanyo lwe-carboxymethyl cellulose ngokulandelanayo, i-viscosity yi-0 ithetha isampuli engenanto.
Xa i-viscosity ye-CMC iyi-400～600mPa•s, ukongezwa kwe-CMC kunokufikelela kwisiphumo esihle sokuqinisa.
4. Impembelelo yesidanga sokutshintshwa kumandla ephepha elomeleziweyo le-CMC
Iqondo lokutshintshwa kwe-CMC eyongezwe kwisiphelo esimanzi silawulwa phakathi kwe-0.40 kunye ne-0.90.Ukuphakama kweqondo lokutshintshela, ngcono ukutshintshwa okufanayo kunye nokunyibilika, kwaye iyunifomu ngakumbi intsebenziswano kunye nefayibha, kodwa intlawulo embi nayo yonyuka ngokufanelekileyo, eya kuchaphazela indibaniselwano phakathi kweCMC kunye nefayibha [11].Yongeza i-0.2% ye-NX-800 kunye ne-NX-800AT carboxymethyl cellulose kunye ne-viscosity efanayo ngokulandelanayo, iziphumo ziboniswa kuMfanekiso 4.
Amandla okuqhuma, amandla okukrazula, kunye namandla okusonga konke kuyancipha ngokunyuka kwe-CMC substitution degree, kwaye ifikelele kwiqondo eliphezulu xa i-degree degree substitution yi-0.6, enyuka ngokulandelelanayo nge-21.0%, 13.2%, kunye ne-75% xa kuthelekiswa nesampuli engenanto.Xa kuthelekiswa, i-CMC eneqondo lokutshintshwa kwe-0.6 iluncedo ngakumbi ekwandiseni amandla ephepha.
5 Isiphelo
5.1 I-pH ye-slurry wet end system inefuthe elibalulekileyo kumandla ephepha lephepha eliphuculweyo le-CMC.Xa i-pH iphakathi kwe-6.5 ukuya kwi-8.5, ukongezwa kwe-CMC kunokusebenzisa umphumo omhle wokuqinisa, kunye nokuqiniswa kwe-CMC kulungele ukwenza iphepha elingathathi hlangothi.
5.2 Isixa se-CMC sinempembelelo enkulu ekomelezeni iphepha le-CMC.Ngokunyuka komxholo we-CMC, amandla okuqina, ukuxhathisa okugqabhuka kunye namandla okukrazula iphepha anyuke kuqala kwaye athande ukuzinza, ngelixa unyamezelo lokusonga lubonisa umkhwa wokunyuka kuqala kwaye emva koko unciphe.Xa i-dosage yi-0.12%, umphumo ocacileyo wokuqiniswa kwephepha unokufumaneka.
Ubunzima bemolekyuli ye-5.3CMC nayo inefuthe elibalulekileyo kwimpembelelo yokuqinisa iphepha.I-CMC ene-viscosity ye-400-600mPa·s inokufezekisa ukomelezwa kwamaphepha okulungileyo.
5.4 Iqondo lokutshintshwa kwe-CMC linempembelelo ekomelezeni isiphumo sephepha.I-CMC ene-substitution degree ye-0.6 kunye ne-0.9 inokuphucula ngokucacileyo ukusebenza kwamandla ephepha.Isiphumo sophuculo se-CMC enedigri ye-0.6 yokutshintsha ingcono kune-CMC eneqondo lokutshintsha elingu-0.9.
Ixesha lokuposa: Jan-28-2023