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Polymer emulsion for water-based printing ink and preparation method thereof

A technology of polymer emulsion and water-based ink, applied in the direction of ink, application, household appliances, etc., can solve the problems of high organic solvent content, emulsion precipitation, complicated preparation process, etc., and achieve the effect of good stability

Active Publication Date: 2012-07-11
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the styrene-acrylic emulsion prepared by these methods is used for water-based gravure ink, there are problems such as (1) color unevenness, shrinkage cavity, and flooding during high-speed gravure printing, (2) color and printing effect are difficult to control, and plate washing is difficult.
The reason for these problems may be that these polymer emulsions are prone to coagulation under high shear, or it may be that the emulsion precipitates or thickens after contacting pigments or ethanol, or it may be that the surface tension of the prepared water-based ink is too high. The ink layer cannot be transferred smoothly during printing
[0005] Chinese Patent Publication No. CN101054489A, has announced " a kind of method for preparing water-based gravure ink with commercial acrylic emulsion and commercial acrylic resin ", when the printing ink produced by this method is used for high-speed gravure printing, there are uneven color, shrinkage cavity and The printing effect is difficult to control, etc.
[0006] Chinese Patent Publication No. CN101353499A has announced " a kind of preparation method of styrene-acrylic core-shell emulsion linker for water-based ink, the preparation process of this method is complicated, needs to prepare water-based polyurethane dispersion liquid, wherein the organic solvent content is high, and water-based polyurethane composition is harmful to Ink performance is affected
[0007] From the above, it can be found that although water-based gravure printing inks have attracted attention as an alternative system for solvent-based inks, there are various problems in the existing water-based polymer emulsions when used as water-based inks, and the printing effect is not ideal. If water-based inks To replace existing solvent-based gravure inks, the performance of water-based polymer emulsions needs to be further improved

Method used

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  • Polymer emulsion for water-based printing ink and preparation method thereof
  • Polymer emulsion for water-based printing ink and preparation method thereof
  • Polymer emulsion for water-based printing ink and preparation method thereof

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preparation example Construction

[0061] In a typical embodiment of the present invention, the preparation method of the above-mentioned polymer emulsion for water-based ink includes the following steps: mixing the mixed monomers, the first part of emulsifier and deionized water, and performing pre-emulsification to obtain a pre-emulsion A; the initiator and deionized water are prepared into solution B; the second part of emulsifier and deionized water are mixed under nitrogen atmosphere and stirring conditions, and the temperature is raised to the temperature at which the polymerization reaction occurs; the mixed solution A and the The above solution B, after dripping, continued to react for 2-3 hours; raised the temperature to 20-25°C and continued to react for 2 hours to obtain a polymerized emulsion; cooled the polymerized emulsion, adjusted the pH value to neutral, and added deionized water to adjust the polymerized emulsion the solid content to 33%-43%, to obtain the polymer emulsion for water-based ink. ...

Embodiment 1-10

[0070] The preparation method of polymer emulsion among the embodiment 1-10:

[0071] Add the mixed monomer, 9 / 10 emulsifier and deionized water at least equal to the weight of the mixed monomer into the pre-emulsifier, and perform pre-emulsification for 10 minutes to obtain pre-emulsion A, and transfer the pre-emulsion A to the reaction The feeding tank 1 of the kettle;

[0072] Prepare the initiator and deionized water at least 10 times the weight of the initiator to prepare solution B at ≤ 30°C, and transfer solution B to the feeding tank 2 of the reactor;

[0073] Add the remaining emulsifier and deionized water at least equal to the weight of the remaining emulsifier into the polymerization reactor, start stirring under the protection of nitrogen, and heat up to the temperature of the polymerization reaction of 30-75°C; the pre-emulsion A and the solution B is slowly added to the polymerization reaction kettle from the feeding tank of the reaction kettle, and the feeding...

Embodiment 1

[0075] Mixed monomers: BMA: 2.0 parts, EHMA: 46 parts, IBOMA: 44 parts, St: 2.67 parts, MMA: 5.33 parts; MA (functional monomer) 2.5 parts;

[0076] Emulsifier: SN-15: 7.0 parts, SDS: 0.5 parts;

[0077] Initiator: ammonium persulfate: 3 parts,

[0078] Polymerization temperature: 75°C.

[0079] Solid content 50wt%, Tg 60°C, Hansch parameter: 3.81.

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PUM

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Abstract

The invention provides a polymer emulsion for water-based printing ink and a preparation method thereof. The polymer emulsion is prepared by mixed monomers and reactive emulsifiers containing at least an allyl or a vinyl, wherein the reactive monomers comprise a soft monomer and a hard monomer. The polymer emulsion for water-based printing ink has the disadvantages of good stability and hydrophilic-hydrophobic balance and is applicable to preparing water-based gravure printing ink.

Description

technical field [0001] The invention relates to the field of gravure printing, in particular to a polymer emulsion for water-based ink and a preparation method thereof. Background technique [0002] Gravure printing is a screen with a mesh structure. The ink volume and volume of the mesh are controlled by the size or depth of the mesh to achieve the hierarchical expression of printing tones. It has the advantages of fast speed, full color, and brightness. Good, clear dots, in-line drying and other advantages, especially suitable for printing of large-volume products, it is a very important and efficient printing method. Compared with other printing methods, the ink layer of gravure printing products is thicker. When printing at high speed, the transferability of ink from the gravure plate to the substrate is very high. Therefore, solvent-based gravure printing inks are still widely used in high-speed gravure printing. . However, when this solvent-based gravure ink is used,...

Claims

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Application Information

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IPC IPC(8): C08F220/18C08F212/08C08F220/14C08F220/06C08F220/38C08F2/30C08F2/26C09D11/10C09D11/106
Inventor 王跃川丁国静
Owner SICHUAN UNIV