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Method for enhancing whiteness of coated paper or coated paper board with starch

A technology of coated paperboard and coated paper, which is applied in the field of improving the whiteness of coated paper or coated paperboard with starch, which can solve the problems of low affinity and reduced whitening efficiency of OBA, and achieves a wide range of applications and is beneficial to the environment. Protect and reduce the effect of negative impact

Inactive Publication Date: 2011-11-02
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the affinity between OBA and commonly used pigments and latex adhesives is very small, and water-soluble OBA can penetrate into the paper with water after application, which greatly reduces the whitening efficiency of OBA.

Method used

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  • Method for enhancing whiteness of coated paper or coated paper board with starch
  • Method for enhancing whiteness of coated paper or coated paper board with starch
  • Method for enhancing whiteness of coated paper or coated paper board with starch

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method of using starch to improve the whiteness of coated paper or coated cardboard. This embodiment relates to the effect of substituting starch for part of the latex in the primer coating on the whiteness of coated recycled cardboard:

[0029] (1) Apply the primer coating at a quantitative rate of 141g / m 2 , on recycled cardboard paper with a whiteness of 15.8%, the coating amount of primer is 10±1g / m 2 . The solid content of the paint is about 60%, and the pH is about 8.5. The primer paint includes:

[0030] 60 parts of kaolin (more than 90% less than 2 microns), 40 parts (grade 55) of calcium carbonate, 5 parts of styrene-butadiene latex, 10 parts of starch,

[0031] Other auxiliary materials: dispersant (sodium polyacrylate), 0.2 part; defoamer (polyethylene glycol), 0.03 part; lubricant (calcium stearate), 0.3 part; water-resistant agent (polyamide polyurea resin), 0.5 part.

[0032] (2) As a comparative sample, the starch-free primer coating is applied at a ...

Embodiment 2

[0040] A method for improving the whiteness of coated paper or coated paperboard with starch, this embodiment relates to the influence of OBA carrier in the top coating on the whiteness of coated cardboard paper:

[0041] (1) Containing 0.6 parts of 4S type fluorescent whitening agent and 1 part of OBA carrier (PVA) top coating paint application on the regenerated cardboard paper that contains 10 parts of starch and 5 parts of latex primer in embodiment 1 . The solid content of the paint is about 60%, and the pH is about 8.5. The top coat includes:

[0042] 60 parts of fine-grained kaolin (more than 92% less than 2 microns), 40 parts (grade 98) of calcium carbonate, 12 parts of styrene-butadiene latex, 0.6 parts of 4S type fluorescent whitening agent, 1 part of polyvinyl alcohol (PVA as OBA carrier), Other auxiliary materials: 0.2 parts of dispersant; 0.03 parts of defoamer, 0.3 parts of lubricant, and 0.5 parts of anti-water agent.

[0043] Top coat coating amount is 17±1g / ...

Embodiment 3

[0049] A method of using starch to improve the whiteness of coated paper or coated board, this example relates to the effect of starch replacing latex on the whiteness of coated kraft cardboard

[0050] (1) Use unbleached softwood kraft pulp to make unbleached kraft linerboard, and the weight of the base paper made is 100±2g / m 2 , the whiteness is 20.5%, and it is used as coated kraft card base paper.

[0051] (2) Using a coating device, the primer is coated on the above-mentioned kraft cardboard. The primer includes 60 parts of kaolin (more than 90% less than 2 microns), 40 parts (grade 55) of calcium carbonate, and 8 parts of styrene-butadiene Latex, 6 parts of starch, other commonly used coating additives such as: dispersant, anti-water agent, defoamer, lubricant. Coating amount is 12±1g / m 2 .

[0052] (3) Using a coating device, the top coating is applied on the primed kraft cardboard, wherein the top coating includes 60 parts of fine-grained kaolin (more than 92% is le...

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Abstract

The invention relates to a method for enhancing whitening efficiency of an optical bleaching agent (OBA) in a double-coated / multi-coated paper or coated paper board with starch. In the method provided by the invention, starch is substituted for part or all of expensive synthetic latex adhesive in the paint by utilizing the characteristic that the cheap starch can retain the OBA on the surface of the coated paper, and meanwhile, the consumption of the expensive OBA carrier PVA (polyvinyl alcohol) or CMC (carboxymethyl cellulose) is lowered, thereby being beneficial to environmental protection and greatly lowering the production cost of the coated paper and coated paper board. The invention is suitable for factories for producing enamelled paper, coated ivory board, coated white board, coated box paper board, coated kraft cardboard, and other coated paper and coated paper boards by a double-coating or multi-coating technique.

Description

technical field [0001] The invention belongs to the field of pulp and papermaking, in particular to a method for improving the whiteness of coated paper or coated board with starch. Background technique [0002] The paper industry makes extensive use of optical brighteners (OBA or FWA) to improve the whiteness and hue of coated and uncoated paper. OBA is a class of substances whose molecules themselves have the ability to absorb ultraviolet light and emit blue light in the visible light region. The blue light (approximately around 440nm) emitted by the OBA added in the paper can compensate the light yellow color of the pulp fiber itself, thereby improving the measurable whiteness and visual whiteness of the paper. [0003] Water-soluble optical brighteners are also often added to coated paper coatings to improve the optical properties and printability of paper. Coated paper coatings are mainly composed of inorganic or organic pigments, adhesives and other components, of wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/30D21H19/54D21H19/82D21H19/84
CPCD21H19/82D21H19/54D21H21/30
Inventor 臧永华许英崔举锋
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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