Carboxymethyl cellulose ya ƙarfafa

Carboxymethyl cellulose (Carboxy Methyl Cellulose, CMC) wani ether ne na halitta cellulose.Fari ne ko launin rawaya kadan.Yana da anionic surfactant mai narkewa da ruwa.Ba shi da wari, mara daɗi, mara guba, kuma yana da kyakkyawan narkewar ruwa., Danko, emulsification, yaduwa, enzyme juriya, kwanciyar hankali da kuma muhalli abokantaka, CMC ne yadu amfani a papermaking, yadi, bugu da rini, man fetur, kore noma da kuma polymer filayen.A cikin takarda masana'antu, CMC da aka yadu amfani a saman sizing jamiái da shafi adhesives shekaru da yawa, amma shi ba a da kyau ɓullo da kuma amfani a matsayin papermaking rigar-karshen ƙarfafa wakili.

Ana cajin saman cellulose mara kyau, sabili da haka, polyelectrolytes anionic gabaɗaya ba sa tallata shi.Koyaya, binciken ya nuna cewa ana iya haɗa CMC zuwa saman ɓangaren ɓangaren ɓangaren chlorine-free bleaching (ECF), wanda zai iya ƙara ƙarfin takarda;Bugu da ƙari, CMC kuma mai watsawa ne, wanda zai iya inganta rarrabuwar fiber a cikin dakatarwa, ta haka yana kawo daidaiton takarda.Inganta darajar digiri kuma yana ƙara ƙarfin jiki na takarda;haka kuma, ƙungiyar carboxyl akan CMC za ta samar da haɗin hydrogen tare da ƙungiyar hydroxyl na cellulose akan fiber don ƙara ƙarfin takarda.Ƙarfin takarda da aka ƙarfafa yana da alaƙa da digiri da rarraba tallan CMC akan filayen fiber, kuma ƙarfin da rarrabawar CMC adsorption a kan fiber surface yana da alaƙa da matakin maye gurbin (DS) da digiri na polymerization (DP). na CMC;cajin, digiri na digiri, da pH na fiber , ƙarfin ionic na matsakaici, da dai sauransu duk za su shafi adadin adsorption na CMC a kan fiber surface, don haka rinjayar ƙarfin takarda.

Wannan takarda ta mayar da hankali kan tasirin tsarin ƙarar rigar-ƙarshen CMC da halayensa akan haɓaka ƙarfin takarda, don kimanta yuwuwar aikace-aikacen CMC a matsayin wakili mai ƙarfafa rigar-ƙarshen takarda, da kuma samar da tushen aikace-aikacen da haɗakarwar CMC. a cikin takarda rigar-karshen.

1. Shiri na CMC bayani

Daidai auna 5.0 g na CMC (cikakkun bushe, canza zuwa CMC mai tsabta), a hankali ƙara shi zuwa 600ml (50 ° C) distilled ruwa a ƙarƙashin motsawa (500r / min), ci gaba da motsawa (20min) har sai bayani ya bayyana, kuma bar shi. kwantar da hankali zuwa zafin jiki , yi amfani da filastar volumetric 1L zuwa ƙarar ƙararrawa akai-akai don shirya maganin ruwa na CMC tare da maida hankali na 5.0g/L, kuma bar shi ya tsaya a wuri mai sanyi a dakin da zafin jiki na 24 hours don amfani daga baya.

Idan akai la'akari da ainihin aikace-aikacen masana'antu (takarda tsaka tsaki) da tasirin haɓakawa na CMC, lokacin da pH ɗin ya kasance 7.5, ƙimar tensile, fashe index, index hawaye da juriya na takarda takarda suna ƙaruwa da 16.4 dangane da ƙarfin da ya dace na iko mara kyau. samfurin.%, 21.0%, 13.2% da 75%, tare da tasirin ingantaccen takarda.Zaɓi pH 7.5 azaman ƙimar pH don ƙari na CMC na gaba.

2. Tasirin adadin CMC akan haɓaka takardar takarda

Ƙara NX-800AT carboxymethyl cellulose, adadin shine 0.12%, 0.20%, 0.28%, 0.36%, 0.44% (don cikakken bushewar ɓangaren litattafan almara).A ƙarƙashin wasu sharuɗɗan guda ɗaya, an yi amfani da blank ɗin ba tare da ƙara CMC azaman samfurin sarrafawa ba.

Lokacin da abun ciki na CMC ya kasance 0.12%, sakamakon ya nuna cewa ma'auni mai ƙarfi, fashe index, ƙididdiga hawaye da ƙarfin nadawa na takardar takarda sun karu da 15.2%, 25.9%, 10.6% da 62.5% bi da bi idan aka kwatanta da samfurin blank.Ana iya ganin cewa la'akari da gaskiyar masana'antu, ana iya samun sakamako mai kyau na haɓakawa lokacin da aka zaɓi ƙananan ƙwayar CMC (0.12%).

3. Tasirin nauyin kwayoyin CMC akan ƙarfafa takardar takarda

A ƙarƙashin wasu sharuɗɗa, danko na CMC yana wakiltar girman nauyin kwayoyin halitta, wato, matakin polymerization.Ƙara CMC zuwa dakatarwar hannun jari na takarda, danko na CMC yana da tasiri mai mahimmanci akan tasirin amfani.

Ƙara 0.2% NX-50AT, NX-400AT, NX-800AT sakamakon gwajin carboxymethyl cellulose bi da bi, danko shine 0 yana nufin samfurin blank.

Lokacin da danko na CMC shine 400 ~ 600mPa•s, ƙari na CMC zai iya samun sakamako mai kyau na ƙarfafawa.

4. Sakamakon digiri na maye gurbin akan ƙarfin CMC da aka inganta takarda

Matsayin maye gurbin CMC da aka ƙara zuwa ƙarshen rigar ana sarrafa shi tsakanin 0.40 da 0.90.Mafi girman matakin maye gurbin, mafi kyawun musanya daidaituwa da daidaituwa, kuma mafi daidaituwar hulɗa tare da fiber, amma mummunan cajin yana ƙaruwa daidai da haka, wanda zai shafi haɗuwa tsakanin CMC da fiber [11].Ƙara 0.2% na NX-800 da NX-800AT carboxymethyl cellulose tare da danko iri ɗaya bi da bi, an nuna sakamakon a cikin Hoto 4.

Ƙarfin fashewa, ƙarfin tsagewa, da ƙarfin niƙawa duk suna raguwa tare da haɓakar digirin maye gurbin CMC, kuma sun kai matsakaicin lokacin da canjin canjin ya kasance 0.6, waɗanda aka haɓaka da 21.0%, 13.2%, da 75% idan aka kwatanta da samfurin mara kyau.A kwatanta, CMC tare da digiri na maye gurbin 0.6 ya fi dacewa don haɓaka ƙarfin takarda.

5 Kammalawa

5.1 pH na slurry rigar ƙarshen tsarin yana da tasiri mai mahimmanci akan ƙarfin takardar CMC da aka haɓaka.Lokacin da pH ke cikin kewayon 6.5 zuwa 8.5, ƙari na CMC na iya yin tasiri mai kyau na ƙarfafawa, kuma ƙarfafawar CMC ya dace da yin takarda tsaka tsaki.

5.2 Adadin CMC yana da tasiri mai girma akan ƙarfafa takardar CMC.Tare da haɓakar abun ciki na CMC, ƙarfin daɗaɗɗa, juriya mai fashewa da ƙarfin hawaye na takardar takarda ya karu da farko sannan kuma ya kasance da kwanciyar hankali, yayin da juriya na nadawa ya nuna yanayin karuwa da farko sannan kuma raguwa.Lokacin da adadin ya kasance 0.12%, ana iya samun tasirin ƙarfafa takarda a bayyane.

Nauyin kwayoyin halitta na 5.3CMC kuma yana da tasiri mai mahimmanci akan tasirin ƙarfafawa na takarda.CMC tare da danko na 400-600mPa·s na iya cimma kyakkyawan ƙarfafa takarda.

5.4 Matsayin maye gurbin CMC yana da tasiri akan tasirin ƙarfafawa na takarda.CMC tare da digiri na 0.6 da 0.9 na iya inganta aikin ƙarfin takarda a fili.Sakamakon haɓakawa na CMC tare da digiri na 0.6 ya fi na CMC tare da digiri na 0.9.