Carboxymethyl cellulose (Carboxy Methyl Cellulose, CMC) inotorwa ether kubva kune yakasikwa cellulose.Ichena kana kuti yero zvishoma.Iyo inonyungudika mumvura anionic surfactant.Haina hwema, haina kunaka, haina chepfu, uye ine yakanakisa kunyungudika kwemvura., Viscosity, emulsification, diffusion, enzyme kuramba, kugadzikana uye kushamwaridzana kwezvakatipoteredza, CMC inoshandiswa zvakanyanya mukugadzira mapepa, machira, kudhinda uye dhayi, petroleum, girini kurima uye polymer minda.Muindasitiri yemapepa, CMC yakashandiswa zvakanyanya mukuita saizi yepasi uye yekunamira yekunamatira kwemakore mazhinji, asi haina kunyatso gadzirwa uye kuiswa sepepa rekugadzira wet-kuguma kusimbisa mumiriri.
Iyo yepamusoro ye cellulose yakachajiswa zvisina kunaka, saka, anionic polyelectrolytes kazhinji haigone kuishambadza.Zvisinei, zvidzidzo zvakaratidza kuti CMC inogona kusungirirwa pamusoro pe elemental chlorine-free bleaching (ECF) pulp, iyo inogona kuwedzera simba repepa;uyezve, CMC iri zvakare dispersant, iyo inogona kuvandudza kupararira kwefiber mukumiswa, nekudaro kuunza kuenzana kwepepa.Kuvandudzwa kwedhigirii kunowedzerawo simba remuviri repepa;uyezve, boka recarboxyl paCMC richagadzira hydrogen bond neboka rehydroxyl re cellulose pafiber kuwedzera simba rebepa.Simba rebepa rakasimbiswa rine hukama nedhigirii uye kugovera kweCMC adsorption pafiber pamusoro, uye kusimba uye kugovera kweCMC adsorption pafiber surface zvine chekuita nedhigirii rekutsiva (DS) uye dhigirii repolymerization (DP) yeCMC;kuchaja, kurova dhigirii, uye pH yefayibha, iyo ionic simba repakati, nezvimwe zvese zvinokanganisa huwandu hwekushambadza kweCMC pane fiber pamusoro, zvichikanganisa kusimba kwebepa.
Iri bepa rinotarisa pane pesvedzero yeCMC yekunyorova-yekupedzisira yekuwedzera maitiro uye hunhu hwayo pabepa rekusimudzira simba, kuitira kuongorora kugona kwekushandisa kweCMC semapepa ekunyorova-kupera kwekusimbisa mumiriri, uye nekupa hwaro hwekushandisa uye synthesis yeCMC. mune papermaking wet-end.
1. Kugadzirira kweCMC mhinduro
Nyatsoyera kuyera 5.0 g yeCMC (yakanyatsooma, yakashandurwa kuita CMC yakachena), zvishoma nezvishoma wobva wawedzera kune 600ml (50 ° C) mvura yakasvibiswa pasi pekukurudzira (500r / min), ramba uchikurudzira (20min) kusvikira mhinduro yajeka, uye rega iite. inotonhorera kusvika kukamuri tembiricha , shandisa 1L volumetric flask kuti irambe iine vhoriyamu kugadzirira CMC aqueous solution ine concentration ye5.0g/L, uye rega imire panzvimbo inotonhorera pakamuri tembiricha kwemaawa makumi maviri nemana kuti ishandiswe gare gare.
Tichifunga nezve chaiyo maindasitiri application (neutral papermaking) uye CMC yekusimudzira mhedzisiro, kana pH iri 7.5, iyo tensile index, burst index, kubvarura index uye kupeta kutsungirira kwebepa kunowedzerwa ne16.4 zvine chekuita nesimba rinoenderana reiyo isina chinhu kutonga. muenzaniso.%, 21.0%, 13.2% uye 75%, ine zviri pachena mapepa ekuwedzera maitiro.Sarudza pH 7.5 se pH kukosha kune inotevera CMC yekuwedzera.
2. Mhedzisiro yeCMC dosage pabepa sheet kunatsiridza
Wedzera NX-800AT carboxymethyl cellulose, iyo dosage ndeye 0.12%, 0.20%, 0.28%, 0.36%, 0.44% (yemhedziso yakaoma pulp).Pasi pemamwe mamiriro akafanana, iyo isina chinhu isina kuwedzera CMC yakashandiswa seyekudzora sampu.
Kana iyo CMC yemukati iri 0.12%, mhedzisiro inoratidza kuti tensile index, burst index, kubvarura indekisi uye kupeta kusimba kwebepa rinowedzerwa ne15.2%, 25.9%, 10.6% uye 62.5% zvakateerana zvichienzaniswa neiyo isina chinhu sampuli.Zvinogona kuonekwa kuti tichifunga nezvechokwadi cheindasitiri, iyo yakanakira kusimudzira mhedzisiro inogona kuwanikwa kana yakaderera dosi yeCMC (0.12%) yasarudzwa.
3. Mhedzisiro yeCMC molecular uremu pamapepa pepa kusimbisa
Pasi pemamwe mamiriro, viscosity yeCMC inomiririra saizi yehuremu hwayo hwemamorekuru, ndiko kuti, dhigirii repolymerization.Kuwedzera CMC kune pepa stock kumiswa, iyo viscosity yeCMC ine yakakosha kukanganisa pakushandisa maitiro.
Wedzera 0.2% NX-50AT, NX-400AT, NX-800AT carboxymethyl cellulose bvunzo mhinduro zvichiteerana, iyo viscosity ndeye 0 inoreva blank sampuro.
Kana iyo viscosity yeCMC iri 400～600mPa•s, kuwedzera kweCMC kunogona kuwana yakanaka yekusimbisa maitiro.
4. Mhedzisiro yedhigirii yekutsiva pane simba reCMC-inowedzerwa bepa
Iyo dhigirii yekutsiva yeCMC yakawedzerwa kumagumo emvura inodzorwa pakati pe0.40 ne0.90.Iyo yakakwirira dhigirii yekutsiva, zviri nani kutsiva kufanana uye kunyungudika, uye iyo yakawanda yunifomu kupindirana nefiber, asi iyo yakaipa charge inowedzerawo zvinoenderana, izvo zvinokanganisa kusanganiswa pakati peCMC nefiber [11].Wedzera 0.2% yeNX-800 uye NX-800AT carboxymethyl cellulose ine viscosity yakafanana zvakateerana, mhedzisiro inoratidzwa muMufananidzo 4.
Simba rinoputika, simba rekubvarura, uye simba rekupeta zvese zvinodzikira nekuwedzera kweCMC substitution degree, uye kusvika pakakwirira kana dhigirii rekutsiva riri 0.6, iro rinowedzerwa ne21.0%, 13.2%, uye 75% zvichienzaniswa nesample isina chinhu.Mukuenzanisa, CMC ine dhigirii rekutsiva ye0.6 inonyanya kubatsira mukusimudzirwa kwesimba remapepa.
5 Mhedziso
5.1 Iyo pH ye slurry wet end system ine simba rakakosha pakusimba kweCMC-yakakwidziridzwa bepa bepa.Kana iyo pH iri muhuwandu hwe6.5 kusvika 8.5, kuwedzera kweCMC kunogona kuita zvakanaka kusimbisa simba, uye kusimbiswa kweCMC kwakakodzera kuita mapepa asina kwaakarerekera.
5.2 Huwandu hweCMC hune simba guru pakusimbaradza bepa reCMC.Nekuwedzera kweCMC yemukati, kusimba kwekusimba, kuputika kuramba uye kubvarura simba rebepa rakawedzera kutanga uye richiita kunge rakagadzikana, nepo kupeta kutsungirira kwakaratidza maitiro ekuwedzera kutanga uye kuderera.Kana iyo dosi iri 0.12%, iyo yakajeka bepa yekusimbisa mhedzisiro inogona kuwanikwa.
Iyo molecular huremu hwe5.3CMC zvakare ine yakakosha kukanganisa pakusimba kwebepa.CMC ine viscosity ye400-600mPa·s inogona kuwana yakanaka kusimbaradza mapepa.
5.4 Iyo dhigirii yeCMC inotsiva ine chekuita pakusimbaradza kwebepa.Iyo CMC ine dhigirii yekutsiva ye0.6 uye 0.9 inogona zviripachena kuvandudza kuita kwesimba rebepa.Iyo yekuvandudza mhedzisiro yeCMC ine dhigirii yekutsiva ye0.6 iri nani pane iyo yeCMC ine dhigirii rekutsiva ye0.9.
Nguva yekutumira: Jan-28-2023