High-whiteness yellowing-resistant coated ivory board and preparation method thereof

Abstract

The invention provides a high-whiteness yellowing-resistant coated ivory board and a preparation method thereof. Firstly wood pulp is pretreated by using biological enzyme, the pulp grinding degree ofthe pulp can be greatly reduced and thus the pulping energy consumption is reduced; the whiteness of the paper can be indirectly improved by improving the opacity of the pulp, and the bulk of the paper can be improved on the premise of ensuring the strength index of the paper so that the dependence on mechanical pulp is greatly reduced, the ratio of bleached sulfate hardwood pulp to bleached sulfate softwood pulp can be increased, and the use of a fluorescent whitening agent in the pulp is reduced; in addition, the fluorescent whitening agent is added into the core layer pulp and the surfacesizing material so that the whitening effect can be improved, the dosage of the fluorescent whitening agent in the pulp is further reduced, the rapid adjustment of the whiteness of the raw paper is realized, and the raw paper layer with uniform and stable whiteness is obtained; the use amount of the fluorescent whitening agent in the ivory board pulp is small through the adjustment, the whitenessand hue adjusting speed is high, the control is stable, the natural and soft perception is shown under the ultrahigh whiteness, and the yellowing resistance is good.

Description

technical field [0001] The invention belongs to the technical field of papermaking, and in particular relates to a high-whiteness anti-yellowing coated white cardboard and a preparation method thereof. Background technique [0002] In the production of coated white cardboard, fluorescent whitening agents are usually added to the slurry and coating to improve the whiteness of the paper. The whitening effect of the fluorescent whitening agent added to the pulp on paper is mainly affected by factors such as the type of fluorescent whitening agent, pulp whiteness, pulp lignin content, cationic chemicals, system pH, and fillers. In order to give full play to the whitening effect of fluorescent whitening agents and improve the whiteness of paper, the influencing factors such as fluorescent whitening agent type, cationic chemicals, system pH, and fillers can be optimized through relatively simple process design. However, pulp whiteness and pulp lignin content are affected by the d...

AI Technical Summary

Problems solved by technology

This kind of process will have many adverse effects on product quality and paper machine operation: first, it is not only difficult to achieve high paper whiteness, but also not conducive to the stable control of paper hue; second, paper hue is more visually sensitive. Dazzling, not soft, unnatural; Third, after a large amount of fluorescent whitening agent enters the white water system of the paper machine, it not only increases the cost of wastewater treatment, but also requires a long time transition or shutdown for cleaning when changing production of non-fluorescent products. Cause greater loss in production; Fourth, paper is more prone to serious yellowing under light induction and heat induction; Fifth, paper has low strength, poor toughness, and poor surface smoothness and fineness

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