Hydrogen peroxide stabilizing agent in Chinese red pine paper-pulp bleaching process

Abstract

The invention provides a hydrogen peroxide stabilizer used in the masson pine paper pulp bleaching process, which comprises the following raw materials in weight percentage: 5 to 10 percent of ethylenediamine tetraacetic acid, 5 to 7 percent of polyacrylic acid, 5 to 10 percent of diethylene triamine pentacetic acid, 5 to 10 percent of hydroxyl ethidene bis phosphoric acid, proper amount of sodium hydroxide, and the balance being deionized water. The preparation method comprises the following steps: the ethylenediamine tetraacetic acid, the polyacrylic acid, the diethylene triamine pentacetic acid and the hydroxyl ethidene bis phosphoric acid are mixed according to the ratio, added with the sodium hydroxide to adjust the pH value to between 6.0 and 6.5, and added with the deionized water until the blending ratio is 100 percent. The hydrogen peroxide stabilizer used in the masson pine paper pulp bleaching process can be used under the conditions of low alkalinity, medium alkalinity and high alkalinity, chelate metallic ions of manganese, iron and the like make the rate of dissolution of the stabilizer less than 15 percent; when the stabilizer is used for bleaching at a temperature of between 60 and 75 DEG C, the optical brightness value ISO of the masson pine paper pulp is more than 65; moreover, the stabilizer can avoid the fouling of system fibers and gluing matters.

Description

technical field [0001] The invention relates to a hydrogen peroxide stabilizer in the bleaching process of masson pine pulp. Background technique [0002] The paper industry usually uses hydrogen peroxide bleaching to produce high-yield pulp from the fast-growing masson pine as raw material. Since hydrogen peroxide bleaching does not produce toxic substances and reduces pollution, it has outstanding advantages in environmental protection. However, during the bleaching process in alkaline, transition metal ions will catalyze the decomposition of hydrogen peroxide, causing hydrogen peroxide to decompose ineffectively, thereby reducing the bleaching efficiency. Among metal ions, manganese ions have the strongest ability to catalyze the decomposition of hydrogen peroxide. In the prior art, adding sodium silicate and magnesium sulfate in the bleaching process can stabilize hydrogen peroxide, which can not only reduce the impact of transition metal ions, but also reduce costs, but...

AI Technical Summary

Problems solved by technology

In the prior art, adding sodium silicate and magnesium sulfate in the bleaching process can stabilize hydrogen peroxide, which can not only reduce the impact of transition metal ions, but also reduce costs, but it is easy to generate dirt, and undispersed flocculent pulp fibers are also Will affect the bleaching effect