Sodium carboxymethyl cellulose (CMC) yekuputira bepa

Sodium carboxymethyl cellulose (CMC)ipolymer inonyungudika mumvura inonyungudika inowanikwa nekushandiswa kwemakemikari kubva mu cellulose yechisikigo. Ine mvura inonyungudika zvakanaka, inoita firimu, inonamira, inokora uye inogadzikana, uye inoshandiswa zvakanyanya mumabasa akawanda ekugadzira mapepa, kunyanya mukugadzira mapepa ekuputira.

1. Zvinodiwa zvekutanga zvekuputira bepa

Chinangwa chikuru chekuputira bepa ndechekuvandudza hunhu hwepamusoro hwepepa, kusanganisira kutsvedzerera, kupenya, kupenya, kunyudzwa kweinki, kuchinjika kwekudhinda, nezvimwewo. Mafomula akajairika ekuputira anoumbwa ne pigments (dzakadai se kaolin, calcium carbonate, talc, nezvimwewo), ma binders (akadai se emulsions, starch, CMC, nezvimwewo) nezvimwe zvinowedzera (zvakadai se dispersants, lubricants, waterproofing agents, nezvimwewo). Munguva yekuputira, kugadzikana uye kuyerera kwefomura yekuputira uye chimiro chekuputira mushure mekuomeswa zvinotamba basa guru mumhando yekupedzisira yepepa.

2. Basa reCMC mukuputira bepa

2.1. Basa rekubatanidza

CMC inogona kushandiswa sechinobatanidza mavara, uye inoshanda nechinobatanidza chikuru (senge emulsion, starch) kuti ivandudze kunamira kwemavara pamusoro pepepa, nokudaro ichisimudzira kukurumidza kwekuputira uye kuramba kusvuuka.

2.2. Mutongi we rheology ne thickener

CMC inogona kugadzira mhinduro ye colloidal ine viscosity yakati mumvura, iyo inogona kugadzirisa zvinobudirira hunhu hwe rheological hwe coating, kuvandudza kufanana uye kugadzikana kwe coating panguva ye coating process, uye kubatsira kuwana ukobvu hwakafanana hwe coating.

2.3. Chinosimbisa kupararira

Kuwedzera huwandu hwakakodzera hweCMC mufomura yekuputira kunogona kuvandudza kupararira kwezvikamu zvepigment, kudzivirira kupwanyika kwepigment uye flocculation, uye kuve nechokwadi chekugadzikana kwependi panguva yekuchengetwa nekushandiswa.

2.4. Kuvandudza mashandiro ekuputira

CMC ine mukana wekuchinjika kwakanaka uye kufanana kwefirimu mushure mekuumbwa kwefirimu, izvo zvinogona kuvandudza zvakanyanya kutsamira kwepamusoro, kutsvedzerera uye kuchinjika kwekudhinda kwepende, kunyanya yakakodzera bepa rakafukidzwa, makadhibhodhi machena akafukidzwa, bepa rekudhinda repamusoro, nezvimwewo.

2.5. Kuchengetwa kwemvura uye mafuta

CMC inogona kuvandudza kugona kwekuchengetedza mvura kwejira, kudzivirira kukurumidza kuputika kwemvura mujira iri pasi pejira rinokurumidzira kana kuti rinoomesa, uye kuona kuti jasi iri rinoumbwa zvakaenzana; panguva imwe chete, mafuta ayo anobatsirawo kuderedza kukweshana kwemagetsi uye kuvandudza kushanda zvakanaka kwekugadzira.

3. Hunhu hwekushandiswa kweCMC

3.1. Kunyungudika kwemvura kwakanaka kwazvo

CMC iri nyore kunyungudika mumvura inotonhora, iri nyore kushandisa, uye inogona kugadzirwa zvakananga patembiricha yemukamuri pasina kurapwa kwekudziya.

3.2. Mhando dzakapfuma dze viscosity

CMC ine magiredhi akasiyana ekupenya yakakodzera mhando dzakasiyana dzepepa rakaputirwa uye zvinodiwa pakugadzira. Vashandisi vanogona kusarudza modhi yakakodzera zvichienderana nezvinodiwa chaizvo.

3.3. Kugadzikana kwakanaka kwemakemikari

CMC inotsungirira kupisa, chiedza, asidhi uye alkali zvakanyanya, uye haisi nyore kuiparadza nekuiparadza mushure mekushandiswa kwenguva refu.

3.4. Inochengetedza nharaunda uye haina chepfu

Sechinhu chinobva mu cellulose chinobva muzvisikwa, CMC haina chepfu uye haina njodzi, izvo zvinoenderana negwara rekuvandudzwa kwekuchengetedzwa kwezvakatipoteredza zvakasvibira muindasitiri yekugadzira mapepa.

4. Pfungwa huru dzemaitiro ekunyorera

Mukushandiswa chaiko, kuitira kuti CMC ive nebasa rakanakisisa muhurongwa hwekuputira, zvinhu zvinotevera zvinofanira kucherechedzwa:

4.1. Nzira chaiyo yekunyungudutsa

Usati washandisa CMC, inofanira kuwedzerwa zvishoma nezvishoma mumvura inotonhora inokurunga nekukurumidza kudzivirira kuungana uye kukora kwakanyanya munzvimbo yacho. Zvinokurudzirwa kuiwedzera muzvikamu zvakawanda uye kuramba uchikurunga kusvika yanyungudika zvachose.

4.2. Kudzora kwakakodzera mwero wemushonga

Kazhinji, huwandu hweCMC hunowedzerwa hunobva pa0.1% kusvika 0.5% yehuremu hwakaoma hwependi. Huwandu hunogadziriswa zvichienderana nezvinodiwa zvependi uye maitiro ekupendi. Kuwedzera zvakanyanya kunogona kukonzera kuti viscosity yependi ive yakakwira zvakanyanya, zvichikanganisa mashandiro ependi.

4.3. Kuenderana zvakanaka nezvimwe zvinowedzerwa

CMC inoenderana nezvimwe zvinhu zvinowedzerwa pakuputira (zvakadai seemulsions, dispersants, preservatives, nezvimwewo), asi kutarisirwa kwayo kunofanira kupihwa kune zvinoenderana nezvinhu zvine simba zvecationic kudzivirira kudonha kwemvura uye kunaya kwemvura.

5. Mienzaniso yekushandiswa kweCMC mumhando dzakasiyana dzemapepa

Pepa rakaputirwa: rinoshandiswa kuvandudza kutsvedzerera nekupenya kwejira, ukuwo richisimbisa kunamira kwejira;

Kadhibhodhi jena: kuvandudza kuramba kupetwa uye kuchinjika kwekudhinda;

Bepa rine mazita uye bepa rinopisa: vandudza kufanana kwependi yepamusoro uye kujeka kwekudhinda;

Pepa repamusoro rakaputirwa: rinovandudza kugadzikana kwemvura inoputirwa uye rinoderedza chiitiko chekupinda kweinki mukudhinda.

Semusanganiswa wepolymer wechisikigo une mashandiro akanaka kwazvo, sodium carboxymethyl cellulose inoita mabasa akawanda mukuputira mapepa, akadai sekubatanidza, kukora, kuparadzira uye kuvandudza hunhu hwepamusoro. Mutengo wayo wakaderera, kugadzikana kwakanaka uye hunhu hwekuchengetedza nharaunda zvinoita kuti ive nechinzvimbo chakakosha muindasitiri yemazuva ano yekugadzira mapepa. Nekuvandudzwa kuri kuramba kuchiitwa kwezvinodiwa zvemhando yepepa uye kusimudzirwa kwepfungwa dzekugadzira mapepa egirini,CMC icharamba ichishandisa mukana wakakura wekushandisa mumunda wekupenda mapepa.