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Author:Lin, Xiaolei-Marina
Title:Karboksimetyyliselluloosa (CMC) paperinvalmistuksen lisäaineena
Carboxymetyl cellulose (CMC) as an additive for paper manufacturing
Publication type:Master's thesis
Publication year:2010
Pages:84 + [28]      Language:   fin
Department/School:Kemian ja materiaalitieteiden tiedekunta
Main subject:Puunjalostuksen kemia   (Puu-19)
Supervisor:Laine, Janne
Instructor:Korhonen, Markus ; Ånäs, Eeva
OEVS:
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Location:P1 Ark Aalto  2237   | Archive
Keywords:CMC
adsorption
strength agent
karboksimetyyliselluloosa
adsorptio
lujittaja
Abstract (eng): Carboxymethyl cellulose (CMC) as dry strength additives in chemical pulps has been investigated by several research groups.
But only few studies have been made in which CMC has been used with mechanical pulps.
Paper sheets produced from CMC-treated pulps are known to have a considerably higher tensile strength.
The goal of this Master's Thesis was to examine carboxymethyl cellulose as a dry strength agent in mechanical pulps.
CMC and mechanical pulp properties were surveyed briefly in the literature review.
The adsorption of CMC onto mechanical pulp was studied.
Wet end applications of CMC in paper industry were examined exclusively with the main focus on the effects of CMC on the drainage and paper strength.

The drainage study was conducted on three additives which were used with CMC: alum, poly-DADMAC (poly (diallyldimethylammomiun chloride)) and C-PAM (cationic poyakrylamide).
CMC and poly-DADMAC complex was the best method in drainage test, even at a high dosage of CMC.
When CMC added with alum was investigated, CMC with low DS (the degree of substitution) and low DP (the degree of polymerization) demonstrated the lowest drainage time but CMC with high DS and DP drainage time increase very rapidly.

The high dosage of CMC improved paper strength when CMC and poly-DADMAC complex was added in the mechanical pulp slurry.
Poly-DADMAC did not have any influence on the tensile index.
CMC with high DP increased the tensile index slightly, and the index was better than with lower DPs.
CMC with high DP notably improved the Scott bond.
When the total amount of CMC and poly-DADMAC was reduced by about half while retaining the ratio (CMC:poly-DADMAC, 1:1.14), tensile properties reduced only slightly.
When CMC and poly-DADMAC were added sequentially in the slurry, tensile properties were not equally good as in the complex system.
Abstract (fin): Karboksimetyyliselluloosan (CMC) käyttö kemiallisissa massoissa kuivalujuuden parantajana onkin tutkittu paljon, mutta vain muutamat tutkimukset käsittelevät CMC:n käyttöä mekaanisissa massoissa.
Massan CMC-käsittelyn tiedetään parantavat paperin vetolujuutta selvästi.
Tämän työn tavoitteena oli tutkia CMC:n käyttöä kuivalujuuskemikaalina mekaanisissa massoissa.
Kirjallisuusosassa perehdyttiin CMC:n käyttö paperiteollisuudessa märänpään sovelluksissa ja sen vaikutukset paperin lujuuteen, lisäksi käsiteltiin lyhyesti CMC:n ja mekaanisen massan ominaisuuksia.
Kokeellisessa osassa tutkittiin CMC:n adsorptiota mekaaniseen massan ja sen vaikutusta vedenpoistoon ja paperin lujuuteen.

CMC:n vaikutusta vedenpoistoon tutkittiin kolmella kationisella lisäaineella: aluna (alumiinisulfaatti), poly-DADMAC (poly(diallyylidimetyyliammoniumkloridi)) ja C-PAM (kationinen polyakryyliamidi).
Vedenpoistokokeissa todettiin, että CMC/poly-DADMAC -kompleksisysteemi oli paras.
Aluna kanssa lyhyin vedenpoistoaika saavutettiin CMC:lla, jolla oli DS ja DP.
CMC:n ja C-PAM:n kompleksisysteemi ei toiminut, koska vedenpoistoaika on tosi korkea varauksien neutraalipisteessä.

Kiertovesiarkkikokeissa todettiin, että vaan iso CMC:n annostus paransi arkkien lujuutta.
CMC/poly-DADMAC -kompleksisysteemi paransi paperin lujuutta varsinkin palstautumislujuuden osalta.
Sen sijaan poly-DADMAC yksistään ei parantanut lujuutta.
Pitkäketjuinen CMC antoi hieman parempia vetolujuuksia, ja selvästi parempia palstaumislujuuksia kuin muut CMC-laadut.
Kun CMC:n ja poly-DADMAC:n lisäyssuhde oli vakio, mutta polymeerien yhteismäärä vähennettiin.
Vetolujuudet ja palstautumislujuudet nousivat polymeerien yhteismäärät funktiona.
Sekvenssisysteemi ei parantanut lujuutta niin paljon kuin kompleksisysteemi.
ED:2010-08-10
INSSI record number: 40065
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