Paint for reduction of yellow discoloration of paper with high-yield bleaching pulp and coating method

A coating method and high-yield technology, applied in the field of pulp and paper making, can solve the problems of unstable whiteness and yellowing of the base paper, and achieve the effects of good operation performance, good opacity and convenient use.

Inactive Publication Date: 2010-06-30
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because a large amount of lignin is retained in high-yield bleached pulp, lignin will absorb ultraviolet light, resulting in unstable whiteness of the base paper manufactured, and it is easy to turn yellow (yellowing) with prolonged storage time. The Biggest Drawback of Pulp

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A coating for reducing yellowing of paper containing bleached high-yield pulp, the composition and weight percentage range of which are:

[0033] Kaolin, US 1# soil, solid powder: 15%;

[0034] Ground calcium carbonate, particles with particle size less than 2μm account for 90%, solid powder: 60%;

[0035] Titanium dioxide (rutile or anatase, particle size can be nano-scale or micron-scale): 10%

[0036] Auxiliary materials: 15%; additives include 13% carboxylated styrene-butadiene latex, 0.29% fluorescent whitening agent, 0.01% blue dye, 0.5% defoamer, 0.5% lubricant, water retention The dosage of the agent is 0.5%, and the dosage of the fungicide is 0.2%.

[0037] One coating method to reduce yellowing of paper containing bleached high yield pulp is:

[0038] (1) Preparation of dispersion

[0039] Add water to the 1 / 2 place in the disperser, start the agitator, increase the speed to 8000r / min, add polyacrylate dispersant and pigment; the amount of kaolin is 15%, t...

Embodiment 2

[0045] A method for reducing yellowing of paper containing bleached high-yield pulp, the steps are:

[0046] (1) Preparation of dispersion

[0047] Add water to the disperser to 3 / 5, start the agitator, increase the speed to 7200r / min, add hexametaphosphate dispersant and pigment. The amount of dispersant is 0.6% (to the total pigment quality), the amount of kaolin (domestic, solid powder) is 11%, the amount of heavy calcium carbonate (particles with a particle size less than 2 μm account for 65%, slurry, solid content 70%) is 68% , The amount of rutile titanium dioxide (common grade, powder) is 5%. The solid content of the dispersion is 60%, and the speed of 7200r / min is maintained for 80 minutes of dispersion.

[0048] (2) Preparation of paint

[0049] Reduce the dispersion speed to 2500r / min, add other auxiliary materials: the amount of styrene-butadiene latex is 15%, the amount of fluorescent whitening agent is 0.1%, the amount of blue dye is 0.02%, the amount of defoam...

Embodiment 3

[0053] A method for reducing yellowing of paper containing bleached high-yield pulp, the steps are:

[0054] (1) Preparation of dispersion

[0055] Add water to the disperser to 2 / 3, start the agitator, increase the speed to 5000r / min, add hexametaphosphate dispersant and pigment. The amount of dispersant is 0.4% (to the total pigment quality), the amount of kaolin (domestic, solid powder) is 5%, the amount of heavy calcium carbonate (particles with a particle size less than 2 μm account for 55%, slurry, solid content 70%) is 72% , the dosage of anatase titanium dioxide (nanoscale, slurry, solid content is 60%) is 6%, and the solid content of the dispersion is 68%. Keep the speed of 5000r / min and disperse for 60min.

[0056] (2) Preparation of paint

[0057] Reduce the dispersion speed to 3000r / min, and add other auxiliary materials: the amount of styrene-butadiene latex is 10%, the amount of fluorescent whitening agent is 0.1%, the amount of blue dye is 0.01%, the amount o...

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Abstract

The invention relates to a paint for reduction of yellow discoloration of paper with high-yield bleaching pulp and a coating application method. The paint is coated on the surface of raw paper with the high-yield bleaching pulp. In addition to kaolin and calcium carbonate pigment conventionally used, titanium dioxide pigment which can absorb ultraviolet light is introduced in the paint, so as to reduce the yellow discoloration of paper with the high-yield bleaching pulp. The paper with the high-yield bleaching pulp produced by the invention has a low degree of yellow discoloration, and the color difference (delta E) is no higher than 3 after the paper is irradiated by ultraviolet light for 10 hours. Therefore, the paper fundamentally reaches the level of complete chemical pulp. Moreover, the method is simple, the raw materials are easily available, and the operating performance is good.

Description

technical field [0001] The invention belongs to the field of pulping and papermaking, and in particular relates to a coating and a coating method for reducing yellowing of bleached high-yield pulp and paper. Background technique [0002] Bleached high-yield pulp has the advantages of high opacity, high bulk and low production cost, so it is widely used in the pulp and paper industry. Bleached high-yield pulp includes bleached alkaline hydrogen peroxide mechanical pulp (APMP and PRC-APMP), bleached chemical thermomechanical pulp (BCTMP), various bleached semi-chemical pulps (HCP), etc. However, because a large amount of lignin is retained in high-yield bleached pulp, lignin will absorb ultraviolet light, resulting in unstable whiteness of the base paper manufactured, and it is easy to turn yellow (yellowing) with prolonged storage time. The biggest disadvantage of pulp. [0003] Through searching, it is found that the technologies related to the present invention include: 1...

Claims

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Application Information

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IPC IPC(8): D21H17/68D21H17/66D21H23/52
Inventor 臧永华吴振娟刘洪斌杜艳芬
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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