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Coating and coating used coated paper

A technology of coatings and pigments, applied in the field of coated paper, can solve the problems of glossiness and post-press glossiness, poor roughness of coated paper, poor printing and other problems, and achieve the effect of improving gloss and reducing the risk of poor printing

Active Publication Date: 2014-02-19
GOLD EAST PAPER JIANGSU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing paint coating has the following problems: (1) bad printing caused by poor roughness of coated paper; The degree often needs to rely on the additional addition of china clay, precipitated calcium carbonate or nano-silica, which increases the cost of papermaking

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0022] The preparation method of the above-mentioned paint comprises 75-95 parts by weight of pigments, 0.35-10 parts by weight of auxiliary agents, 5-15 parts by weight of latex, 0.02-10 parts by weight of NCC, 0.1-1 parts by weight of alkali and an appropriate amount of water, and mix evenly to obtain a paper-making coating containing nano-microcrystalline cellulose. The preparation of the coating can also add the above-mentioned raw materials in a certain order. The solid content of the paint is 25%-75%, and the pH value is 8-10.5.

[0023] The preparation of the above-mentioned coating can be carried out in a mixing tank, and dispersed at a speed of more than 2000rpm.

[0024] The present invention adds NCC to the paint, which has many beneficial effects:

[0025] (a) A small amount of NCC can change the viscosity and high-shear viscosity of the coating, and can be used as a rheology modifier and a film-forming aid for the coating.

[0026] (b) NCC is a complex polysacc...

Embodiment 1

[0033] In this example, 0.1 part of NCC is added to the precoat, and 0.02 part of NCC is added to the top coat.

[0034] Preparation of precoat paint: Take 75 parts of GCC, add NaOH to adjust the pH of the paint to 9.5, add 7.5 parts of latex, 0.1 part of NCC; continue to add 7.6 parts of auxiliary additives, which include 7 parts of coating starch and 0.05 parts of dispersant , 0.05 part of lubricant, 0.1 part of defoamer and 0.4 part of water-resistant agent, add water to adjust the solid content of the coating to 64%; high-speed dispersion for 20 minutes to prepare the pre-coated coating.

[0035] Preparation of top coating: take 90 parts of pigments, including 85 parts of GCC and 5 parts of kaolin; adjust the pH to about 9 by adding NaOH; add 10 parts of latex, 0.02 parts of NCC; continue to add 2.25 parts of auxiliary additives, which include 0.2 part of dispersant, 1 part of lubricant, 0.05 part of defoamer and 1 part of water-resistant agent; adjust the solid content of...

Embodiment 2

[0044] In this embodiment, 0.15 part of NCC is added to the top coat.

[0045]Preparation of precoat paint: Take 75 parts of GCC, add NaOH to adjust the pH of the paint to 9.5, add 7.5 parts of latex; continue to add 7.6 parts of auxiliary additives, which include 7 parts of coating starch, 0.05 parts of dispersant, and 0.05 parts of lubricating agent Agent, 0.1 part of defoamer and 0.4 part of water-resistant agent, adding water to adjust the solid content of the coating to 64%; high-speed dispersion for 20 minutes to prepare a pre-coated coating.

[0046] Preparation of top coating: take 90 parts of pigments, including 36 parts of GCC and 54 parts of kaolin; adjust the pH to about 9.5 by adding NaOH; add 11 parts of synthetic latex, add 0.15 parts of NCC; continue to add auxiliary agents, which include 0.05 part of dispersant, 0.6 part of lubricant, 0.05 part of defoamer and 0.6 part of water-resistant agent; adjust the solid content of the coating to 67%, and disperse at hi...

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PUM

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Abstract

The invention provides a coating used in the papermaking field. The coating contains nanometer microcrystalline cellulose, a pigment, a latex, an assistant and water, and the nanometer microcrystalline cellulose is highly-crystallized cellulose having a length of 100-500nm and a width of 3-100nm obtained by hydrolyzing a cellulose raw material in a strong acid; and the bone dry mass parts of the nanometer microcrystalline cellulose, the pigment, the latex, the assistant and water in the coating are 0.02-10, 75-95, 5-15 and 0.35-10 respectively. The invention also provides a coated paper made by using the coating. The coating is coated on the surface of paper to effectively improve the glossiness, the post-print glossiness and the roughness of the coated paper in order to improve the paper quality.

Description

technical field [0001] The invention relates to a coating used in the field of papermaking and coated paper prepared by using the coating. Background technique [0002] In the field of papermaking, in order to endow paper with some special properties, coatings are usually coated on one or both sides of base paper and dried to form a coating. However, the existing paint coating has the following problems: (1) poor printing caused by poor roughness of the coated paper; (2) the gloss and post-press gloss of the coated paper are affected by the pigment in the paint formula, and the excellent gloss The degree often needs to rely on the additional addition of china clay, precipitated calcium carbonate or nano-silica, which increases the cost of papermaking. Contents of the invention [0003] In view of this, it is necessary to provide a coating that can effectively solve the above problems. [0004] In addition, it is also necessary to provide a coated paper prepared by applyi...

Claims

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Application Information

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IPC IPC(8): D21H19/52D21H19/38D21H19/40D21H19/58D21H19/62D21H21/06D21H21/08D21H21/12
Inventor 封衍秦昀昌
Owner GOLD EAST PAPER JIANGSU
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