Cellulose Ether mune Pepa Indasitiri

Iri bepa rinosuma mhando, nzira dzekugadzirira, maitiro ekuita uye chimiro chekushandiswa kwema cellulose ethers muindasitiri yekugadzira mapepa, inoisa mberi mamwe marudzi matsva emaselulosi ether ane tarisiro yebudiriro, uye inokurukura mashandisiro adzo uye maitiro ebudiriro mukugadzira mapepa.

Mazwi akakosha:cellulose ether; performance; indasitiri yemapepa

Cellulose inzvimbo yakasikwa yepolymer, chimiro chayo chemakemikari i polysaccharide macromolecule ine anhydrous.β-glucose semhete yepasi, uye yega yega mhete ine yekutanga hydroxyl boka uye yechipiri hydroxyl boka. Kuburikidza nekugadzirisa kwayo kemikari, nhevedzano ye cellulose derivatives inogona kuwanikwa. Iyo nzira yekugadzirira ye cellulose ether ndeyekuita selulosi neNaOH, wobva waita etherification reaction neyakasiyana-siyana inoshanda reactants senge methyl chloride, ethylene oxide, propylene oxide, nezvimwewo, wobva wageza ne-chigadzirwa munyu uye imwe cellulose sodium kuti uwane. chigadzirwa. Cellulose ether ndechimwe chezvinhu zvakakosha zvinobva kune cellulose, iyo inogona kushandiswa zvakanyanya mukurapa uye utsanana, zuva nezuva indasitiri yemakemikari, kugadzira mapepa, chikafu, mishonga, kuvaka, zvinhu uye mamwe maindasitiri. Mumakore achangopfuura, nyika dzekunze dzakakoshesa tsvagiridzo yayo, uye zvakawanda zvakabudirira zvakaitwa mukushandiswa kwetsvakiridzo yekutanga, kushandisa mhedzisiro inoshanda, uye kugadzirira. Mumakore achangopfuura, vamwe vanhu muChina vakatanga zvishoma nezvishoma kupinda mukutsvagisa kwechinhu ichi, uye vakambowana mhedzisiro mukuita kugadzirwa. Naizvozvo, kusimudzirwa uye kushandiswa kwe cellulose ether kunoita basa rakakosha mukushandiswa kwakadzama kwezvezvezve zviwanikwa zvipenyu uye kuvandudzwa kwemhando yepepa uye kuita. Irwo rudzi rutsva rwemapepa ekuwedzera akakodzera kukudziridzwa.

1. Kuronga uye nzira dzekugadzirira dze cellulose ethers

Kupatsanurwa kwe cellulose ethers kunowanzo kupatsanurwa muzvikamu zvina zvinoenderana neionity.

1.1 Nonionic Cellulose Ether

Non-ionic cellulose ether inonyanya kuve cellulose alkyl ether, uye nzira yekugadzirira ndeyekuita seruseru neNaOH, uyezve kuita etherification reaction neakasiyana anoshanda monomers akadai semonochloromethane, ethylene oxide, propylene oxide, nezvimwe. the by-product munyu uye cellulose sodium, kunyanya kusanganisira methyl cellulose ether, methyl hydroxyethyl cellulose ether, methyl hydroxypropyl cellulose ether, hydroxyethyl cellulose ether, cyanoethyl Cellulose ether uye hydroxybutyl cellulose ether inoshandiswa zvakanyanya.

1.2 Anionic cellulose ether

Anionic cellulose ethers inonyanya kuve sodium carboxymethyl cellulose uye sodium carboxymethyl hydroxyethyl cellulose. Nzira yekugadzirira ndeyekuita cellulose neNaOH uyezve kuita ether ine chloroacetic acid, ethylene oxide uye propylene oxide. Kemikari reaction, uyezve inowanikwa nekugeza ne-chigadzirwa munyu uye sodium cellulose.

1.3 Cationic Cellulose Ether

Cationic cellulose ethers inonyanya kusanganisira 3-chloro-2-hydroxypropyltrimethylammonium chloride cellulose ether, iyo inogadzirwa nekuita selulosi neNaOH uyezve kuita necationic etherifying agent 3-chloro-2-hydroxypropyl Trimethyl ammonium chloride kana etherification reaction nepropylene oxide uye propylene oxide. wobva wawanwa nekugeza ne-product munyu uye sodium cellulose.

1.4 Zwitterionic Cellulose Eteri

Iyo molecular cheni yezwitterionic cellulose ether ine ese ari maviri mapoka eanionic uye cationic mapoka. Nzira yekugadzirira kwayo ndeyekuita seruseru neNaOH uye wobva waita ne monochloroacetic acid uye cationic etherification agent 3-chloro-2-hydroxypropyl Trimethylammonium chloride inogadziriswa, uye inobva yawanikwa nekugeza ne-product munyu uye sodium cellulose.

2. Kuita uye maitiro e cellulose ether

2.1 Kugadzira firimu uye kunamatira

Iyo etherification ye cellulose ether ine simba guru pamaitiro ayo uye zvivakwa, senge solubility, firimu-kugadzira kugona, kusimba kwechisungo uye munyu kuramba. Cellulose ether ine high mechanical simba, flexible, heat resistance and cold resistance, uye inonyatsoenderana nemhando dzakasiyana-siyana resin uye plasticizers, uye inogona kushandiswa kugadzira mapurasitiki, mafirimu, varnishes, adhesives, latex Uye zvinodhaka zvekuputira zvinhu, nezvimwewo.

2.2 Solubility

Cellulose ether ine mvura yakanaka yekunyungudika nekuda kwekuvapo kwemapoka epolyhydroxyl, uye ine sarudzo dzakasiyana dzekunyungudutsa dzeorganic solvents zvichienderana neyakasiyana inotsiva. Methylcellulose inonyungudika mumvura inotonhora, isinganyunguriki mumvura inopisa, uye zvakare inonyungudika mune zvimwe zvinonyungudutsa; methyl hydroxyethyl cellulose inonyungudika mumvura inotonhora, isinganyunguriki mumvura inopisa uye organic solvents. Nekudaro, kana iyo aqueous solution yemethylcellulose uye methylhydroxyethylcellulose ichipisa, methylcellulose uye methylhydroxyethylcellulose inonaya. Methyl cellulose inonaya pa45-60°C, nepo tembiricha yemvura yakasanganiswa etherified methyl hydroxyethyl cellulose inowedzerwa kusvika 65-80.°C. Kana tembiricha yadzikiswa, mvura inonyungudika. Hydroxyethylcellulose uye sodium carboxymethylcellulose zvinonyungudika mumvura chero tembiricha uye hainyungudika muorganic solvents (kunze kwezvishoma). Uchishandisa ichi chivakwa, zvakasiyana-siyana zvinodzosera mafuta uye zvinonyungudika firimu zvinhu zvinogona kugadzirwa.

2.3 Kukora

Cellulose ether inonyungudutswa mumvura muchimiro checolloid, viscosity yayo inoenderana nehuwandu hwepolymerization ye cellulose ether, uye mhinduro ine hydrated macromolecules. Nekuda kwekupinzwa kwema macromolecules, mafambiro ekuyerera kwemhinduro anosiyana neaya emvura yeNewtonian, asi anoratidza maitiro anochinja neshear force. Nekuda kweiyo macromolecular chimiro che cellulose ether, viscosity yemushonga inowedzera nekukurumidza nekuwedzera kwekutarisa uye inoderera nekukurumidza nekuwedzera kwekushisa. Zvinoenderana nehunhu hwayo, cellulose ethers senge carboxymethyl cellulose uye hydroxyethyl cellulose inogona kushandiswa seyakakora yemakemikari ezuva nezuva, ekuchengetedza mvura maajenti ekuputira mapepa, uye thickeners ekugadzira machira.

2.4 Kudzikira

Kana cellulose ether inonyungudika muchikamu chemvura, mabhakitiriya anokura, uye kukura kwebhakitiriya kunotungamira mukugadzirwa kwe enzyme bacteria. Iyo enzyme inotyora iyo isina kuisirwa anhydroglucose unit bond padhuze ne cellulose ether, ichideredza huremu hwemamorekuru epolymer. Nokudaro, kana iyo cellulose ether aqueous solution inofanira kuchengetwa kwenguva yakareba, zvinodzivirira zvinofanira kuwedzerwa kwairi, uye mamwe matanho ekuuraya utachiona anofanirwa kutorwa kunyange kune cellulose ethers ine antibacterial properties.

3. Kushandiswa kwe cellulose ether muindasitiri yemapepa

3.1 Pepa rinosimbisa agent

Semuenzaniso, CMC inogona kushandiswa se fiber dispersant uye pepa rinosimbisa mumiririri, iyo inogona kuwedzerwa kune pulp. Sezvo sodium carboxymethyl cellulose ine mutero wakafanana seye pulp uye filler particles, inogona kuwedzera kuenzana kwefiber. Iko kusungirirana pakati pemafiber kunogona kuvandudzwa, uye zviratidzo zvemuviri senge kusimba kwesimba, kuputika simba, uye kuenzana kwepepa kwepepa kunogona kuvandudzwa. Semuyenzaniso, Longzhu nevamwe vanoshandisa 100% bleached sulfite huni pulp, 20% talcum hupfu, 1% yakapararira rosin guruu, gadzirisa pH kukosha kusvika 4.5 nealuminium sulfate, uye shandisa yakakwirira viscosity CMC (viscosity 800 ~ 1200MPA.S) Dhigirii kutsiva ndeye 0.6. Zvinogona kuoneka kuti CMC inogona kuvandudza kuoma kwesimba rebepa uye zvakare kugadzirisa saizi yayo degree.

3.2 Surface saizi agent

Sodium carboxymethyl cellulose inogona kushandiswa sebepa pamusoro saizi mumiriri kuvandudza simba repamusoro pepepa. Maitiro ayo ekushandisa anogona kuwedzera simba repamusoro neanenge gumi muzana kana zvichienzaniswa nekushandiswa kwazvino kwepolyvinyl doro uye yakagadziridzwa starch sizing agent, uye dosi inogona kudzikiswa ne30%. Iyo inovimbisa zvakanyanya pamusoro saizi mumiriri wekugadzira mapepa, uye iyi nhevedzano yemhando nyowani inofanirwa kuvandudzwa. Cationic cellulose ether ine zvirinani pamusoro saizi kuita pane cationic starch. Haikwanise kungovandudza simba repamusoro repepa, asi zvakare kuvandudza inki yekunyudza kuita kwebepa uye kuwedzera dhayi maitiro. Iyo zvakare inovimbisa pamusoro saizi agent. Mo Lihuan nevamwe vakashandisa sodium carboxymethyl cellulose uye oxidized starch kuita bvunzo dzepamusoro pamapepa nemakadhibhodi. Mhedzisiro yacho inoratidza kuti CMC ine yakanakira nzvimbo saizi maitiro.

Methyl carboxymethyl cellulose sodium ine kumwe kuita saizi, uye carboxymethyl cellulose sodium inogona kushandiswa seye pulp sizing agent. Pamusoro peiyo saizi yedhigirii, cationic cellulose ether inogona zvakare kushandiswa sepepa rekuchengetedza yekubatsira Sefa, kuvandudza mwero wekuchengeta wemafibhi akanaka uye mafirita, uye inogona zvakare kushandiswa seanosimbisa mapepa.

3.3 Emulsion stabilizer

Cellulose ether inoshandiswa zvakanyanya mukugadzirira emulsion nekuda kwekunaka kwayo kusimba mukugadzirisa kwemvura, iyo inogona kuwedzera viscosity ye emulsion dispersion medium uye kudzivirira emulsion precipitation uye stratification. Zvakadai se sodium carboxymethyl cellulose, hydroxyethyl cellulose ether, hydroxypropyl cellulose ether, etc. inogona kushandiswa sezvigadziro uye zvinodzivirira zveanionic yakapararira rosin gum, cationic cellulose ether, hydroxyethyl cellulose ether, hydroxypropyl cellulose ether, ether Base cellulose cellulose, etc. ether, nezvimwewo inogona zvakare kushandiswa seanodzivirira ejenti ye cationic disperse rosin chingamu, AKD, ASA uye mamwe masing agents. Longzhu et al. yakashandisa 100% bleached sulfite wood pulp, 20% talcum powder, 1% yakapararira rosin glue, yakagadzirisa pH kukosha kusvika 4.5 nealuminium sulfate, uye yakashandiswa yakakwirira viscosity CMC (viscosity 800 ~ 12000MPA.S). Iyo dhigirii yekutsiva ndeye 0.6, uye inoshandiswa kune yemukati saizi. Zvinogona kuoneka kubva pane zvabuda kuti saizi yerosin rabha ine CMC inovandudzwa zviri pachena, uye kugadzikana kweiyo rosin emulsion kwakanaka, uye chiyero chekuchengetedza cherubha zvinhu zvakare chakakwira.

3.4 Kuvhara mvura inochengetedza mumiriri

Inoshandiswa kupfekedza uye kugadzirisa mapepa ekuputira binder, cyanoethyl cellulose, hydroxyethyl cellulose, nezvimwewo inogona kutsiva casein uye chikamu che latex, kuitira kuti inki yekudhinda ipinde nyore nyore uye micheto yakajeka. Carboxymethyl cellulose uye hydroxyethyl carboxymethyl cellulose ether inogona kushandiswa sepigment dispersant, thickener, water retention agent uye stabilizer. Semuenzaniso, huwandu hwecarboxymethyl cellulose hunoshandiswa semugadziri wekuchengetedza mvura mukugadzirira kwemapepa akavharidzirwa akavharwa ndeye 1-2%.

4. Kuvandudza Maitiro eCellulose Ether Inoshandiswa muIndasitiri yePepa

Kushandiswa kwekemikari gadziriso yekuwana zvinobva paselulosi zvine mabasa akakosha inzira inoshanda yekutsvaga mashandisirwo matsva egoho guru repasi rose rezvakasikwa organic matter-cellulose. Kune akawanda marudzi ezvinobuda muselulosi uye mabasa akafara, uye cellulose ethers akaiswa mumaindasitiri mazhinji nekuda kwekuita kwavo kwakanaka. Kuti uwane zvinodikanwa zveindasitiri yemapepa, kuvandudzwa kwe cellulose ether kunofanirwa kutarisisa kune anotevera maitiro:

(1) Gadzira zvigadzirwa zvakasiyana-siyana zvema cellulose ethers akakodzera kushandiswa kweindasitiri yemapepa, senge zvigadzirwa zvakatevedzana zvine madhigirii akasiyana ekutsiva, maviscosities akasiyana, uye akasiyana mamorekuru masasi, kusarudzwa mukugadzirwa kwemhando dzakasiyana dzemapepa.

(2) Kugadziridzwa kwemhando nyowani dzema cellulose ethers kunofanirwa kuwedzerwa, senge cationic cellulose ethers yakakodzera kuchengetedza mapepa uye madhiraini anobatsira, pamusoro saizi maajenti, uye zwitterionic cellulose ethers anogona kushandiswa seanosimbisa agent kutsiva coating latex Cyanoethyl cellulose ether. nezvimwe zvakadaro semusungiri.

(3) Simbisa tsvakiridzo pamusoro pegadziriro yegadziriro ye cellulose ether uye nzira yayo itsva yekugadzirira, kunyanya tsvakiridzo yekudzikisa mutengo uye kurerutsa maitiro.

(4) Simbisa tsvakiridzo yezvimiro zve cellulose ethers, kunyanya iyo firimu-inogadzira zvinhu, bonding zvivakwa uye thickening emhando dzakasiyana cellulose ethers, uye simbisa dzidziso yekutsvagisa pamusoro pekushandiswa kwe cellulose ethers mukugadzira mapepa.