Sodium carboxymethyl cellulose (CMC) yopangira mapepala

Sodium carboxymethyl cellulose (CMC)ndi polima wosungunuka m'madzi wa anionic womwe umapezeka mwa kusintha mankhwala pogwiritsa ntchito cellulose yachilengedwe. Uli ndi madzi abwino osungunuka, mphamvu yopangira filimu, umamatira, umakhuthala komanso umakhazikika, ndipo umagwiritsidwa ntchito kwambiri m'malumikizidwe ambiri amakampani opanga mapepala, makamaka popanga mapepala.

1. Zofunikira zazikulu pakuphimba pepala

Cholinga chachikulu cha pepala lopaka utoto ndikukonza mawonekedwe a pamwamba pa pepala, kuphatikizapo kusalala, kunyezimira, kuonekera bwino, kuyamwa kwa inki, kusinthasintha kwa kusindikiza, ndi zina zotero. Mafomula opaka utoto wamba amapangidwa ndi utoto (monga kaolin, calcium carbonate, talc, ndi zina zotero), zomangira (monga emulsions, starch, CMC, ndi zina zotero) ndi zina zowonjezera (monga zotulutsira, mafuta, zotetezera madzi, ndi zina zotero). Panthawi yopaka utoto, kukhazikika ndi kusinthasintha kwa fomula yopaka utoto ndi kapangidwe kake kopaka utoto pambuyo pouma zimagwira ntchito yofunika kwambiri pamtundu womaliza wa pepala.

2. Udindo wa CMC pakuphimba mapepala

2.1. Ntchito ya Binder

CMC ingagwiritsidwe ntchito ngati chomangira chothandizira pa utoto, ndikugwira ntchito ndi chomangira chachikulu (monga emulsion, starch) kuti iwonjezere kumatirira kwa utoto pamwamba pa pepala, motero imawonjezera kulimba kwa utoto ndi kukana kuchotsedwa.

2.2. Wowongolera wokhuthala ndi rheology

CMC ikhoza kupanga yankho la colloidal yokhala ndi kukhuthala kwina m'madzi, komwe kumatha kusintha bwino mawonekedwe a rheological a kupaka, kukonza kufanana ndi kukhazikika kwa kupaka panthawi yopaka, ndikuthandizira kupeza makulidwe ofanana a kupaka.

2.3. Chokhazikitsa kufalikira

Kuwonjezera CMC yokwanira mu fomula yophimba kungathandize kuti tinthu ta utoto tisafalikire, kuletsa kusungunuka kwa utoto ndi kuyandama, ndikutsimikizira kuti utotowo umakhala wolimba panthawi yosungira ndi kugwiritsa ntchito.

2.4. Kuwongolera magwiridwe antchito a kupaka utoto

CMC ili ndi kusinthasintha kwabwino komanso kufanana kwa filimu pambuyo pakupanga filimu, zomwe zingathandize kwambiri kusalala kwa pamwamba, kusalala ndi kusinthasintha kwa kusindikiza kwa ❖ kuyanika, makamaka koyenera pepala lokutidwa, makatoni oyera okutidwa, mapepala osindikizira apamwamba, ndi zina zotero.

2.5. Kusunga madzi ndi mafuta

CMC imatha kukonza mphamvu yosungira madzi ya chophimbacho, kuletsa kusinthasintha kwa madzi mwachangu mu chophimbacho pansi pa chivindikiro champhamvu kapena malo ouma, ndikuwonetsetsa kuti chophimbacho chimapangidwira mofanana; nthawi yomweyo, kukhuthala kwake kumathandizanso kuchepetsa kukangana kwa makina ndikuwonjezera magwiridwe antchito opangira.

3. Makhalidwe a kagwiritsidwe ntchito ka CMC

3.1. Kusungunuka kwabwino kwa madzi

CMC ndi yosavuta kusungunuka m'madzi ozizira, yosavuta kugwiritsa ntchito, ndipo imatha kukonzedwa mwachindunji kutentha kwa chipinda popanda kutentha.

3.2. Mitundu yolemera ya kukhuthala

CMC yokhala ndi magiredi osiyanasiyana a kukhuthala ndi yoyenera mitundu yosiyanasiyana ya mapepala okhala ndi zokutira ndi zofunikira pa njira. Ogwiritsa ntchito amatha kusankha chitsanzo choyenera malinga ndi zosowa zenizeni.

3.3. Kukhazikika kwabwino kwa mankhwala

CMC imapirira kutentha, kuwala, asidi ndi alkali kwambiri, ndipo siiwonongeka mosavuta ikagwiritsidwa ntchito kwa nthawi yayitali.

3.4. Yoteteza chilengedwe komanso yopanda poizoni

Monga chochokera ku cellulose kuchokera kuzinthu zachilengedwe, CMC si poizoni komanso yopanda vuto, zomwe zikugwirizana ndi njira yopititsira patsogolo chitetezo cha chilengedwe chobiriwira mumakampani opanga mapepala.

4. Mfundo zazikulu za njira yofunsira ntchito

Pakugwiritsa ntchito kwenikweni, kuti zitsimikizire kuti CMC imagwira ntchito bwino kwambiri mu dongosolo lopaka utoto, mfundo zotsatirazi ziyenera kukumbukiridwa:

4.1. Njira yoyenera yosungunula

Musanagwiritse ntchito CMC, iyenera kuwonjezeredwa pang'onopang'ono m'madzi ozizira othamanga kwambiri kuti mupewe kusonkhana ndi kukhuthala kwambiri. Ndikofunikira kuiwonjezera m'magulu ndikupitiriza kusakaniza mpaka itasungunuka kwathunthu.

4.2. Kulamulira bwino mlingo

Kawirikawiri, kuchuluka kwa CMC komwe kumawonjezeredwa ndi 0.1% mpaka 0.5% ya kulemera kouma kwa chophimbacho. Kuchuluka kwake kumasinthidwa malinga ndi zofunikira pakugwira ntchito kwa chophimbacho komanso njira yophikira. Kuonjezera kwambiri kungayambitse kukhuthala kwa chophimbacho kukhala kwakukulu kwambiri, zomwe zimakhudza ntchito yophikira.

4.3. Kugwirizana bwino ndi zowonjezera zina

CMC imagwirizana ndi zowonjezera zosiyanasiyana zokutira (monga emulsions, dispersants, zosungira, ndi zina zotero), koma chisamaliro chiyenera kuperekedwa kuti chigwirizane ndi zowonjezera zamphamvu za cationic kuti zisagwedezeke ndi mvula.

5. Zitsanzo za kugwiritsa ntchito CMC m'mitundu yosiyanasiyana ya mapepala

Pepala lokutidwa: limagwiritsidwa ntchito kukonza kusalala ndi kuwala kwa chophimbacho, pomwe likuwonjezera kumamatira kwa chophimbacho;

Katoni yoyera: imawonjezera kukana kupindika ndi kusinthasintha kwa kusindikiza;

Pepala lolemba ndi pepala lotentha: onjezerani kufanana kwa chophimba pamwamba ndi kuwonekera bwino kwa kusindikiza;

Chipepala chatsopano chophimbidwa: chimathandiza kuti madzi ophimbidwawo akhale olimba komanso kuchepetsa kufalikira kwa inki yosindikizira.

Monga mankhwala achilengedwe a polima omwe amagwira ntchito bwino kwambiri, sodium carboxymethyl cellulose imagwira ntchito zambiri pakuphimba mapepala, monga kulumikiza, kukhuthala, kufalitsa ndi kukonza mawonekedwe a pamwamba. Mtengo wake wotsika, kukhazikika bwino komanso mawonekedwe ake oteteza chilengedwe zimapangitsa kuti ikhale yofunika kwambiri mumakampani amakono opanga mapepala. Ndi kusintha kosalekeza kwa zofunikira pamtundu wa mapepala komanso kukwezedwa kwa malingaliro opanga mapepala obiriwira,CMC ipitiliza kugwiritsa ntchito bwino kwambiri pakupanga mapepala.