Reinforcement of Scrap Paper and Recycled Cardboard Sized in Acidic, Neutral and Weakly Alkaline Media

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UDС

676.12

DOI:

10.17238/issn0536-1036.2015.5.165

Abstract

The paper is devoted to the study of the strengthening connections effect, based on synthetic rubber latex and polyaminoamide compounds in the sizing in acidic (pH 4.8–5.2), neutral (pH 6.5–7.2) and weakly alkaline (pH 7.3–7.8) media, on the hydrophobicity and strength of the paper samples. Now the polyamideamine-epichlorohydrin (Melapret PAE/A, Maresin, etc.), melamine-formaldehyde and urea-formaldehyde resins are applied to reinforce the paper and cardboard to be resistant in dry and wet conditions. The resins are introduced into the pulp containing natural and synthetic sizing agents with hydrophobic properties in acidic, neutral and weakly alkaline media. A variety of natural sizing agents in the form of modified resina hydrodispersions are used for fiber suspension sizing in acidic and neutral media, and synthetic – in neutral and weakly alkaline media. The processes of sizing and hardening are competing. Therefore, the studies of the synthetic polymers with a strengthening effect on the sized paper and cardboard produced at pH 4.8–7.8 are of special scientific and practical interests. The mission of the paper is the developing of a technological mode of water-repellency treatment and the reinforcement of scrap paper and basic layers of cardboard in acidic, neutral and weakly alkaline media in the presence of synthetic polymers based on the synthetic rubber latex and polyaminoamide compounds. We started with a selection of fiber suspension model (pulp, simulating the secondary fibrous raw material – waste paper by its fractional composition and papermaking properties), and then we administered the hydrophobic agents such as the modified resina hydrodispersion (a reinforced size of TM brand) and AKD dispersions of Dymar VP 738 brand and synthetic polymers providing a strengthening effect on the basic paper and cardboard layers manufactured from the secondary (waste paper) raw materials. As the polymer compounds we used a cationic starch of Hi Cat brand (“Roquette”, France), polyamideamine-epichlorohydrin resin (Melapret PAE/A (“Kemiopol”, Poland)) and a new polymer obtained at the Department of chemical processing of wood of Belarusian State Technological University – the polycondensate of hexandioic acid with diethylenetriamine, modified by rosin acids, and styrene-acrylate dispersion Acronal 290 D (“BASF”, Germany). From the resulting pulp the paper samples and basic cardboard layers were prepared, and dry hydrophobicity and strength were determined.

Authors

S.A. Gordeyko, Postgraduate Student 

Affiliation

Belarusian State Technological University, Sverdlova st., 13, block A, Minsk, 220050, Bela-rus; е-mail: svetastar1988@mail.ru

Keywords

waste paper, paper sizing, reinforcement, cationic starch, polyamideamine-epichlorohydrin resin, synthesized polyaminoamide polymer, styrene-acrylate dispersion.

References

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