Color paste for water-based ink and preparation method thereof

A color paste, hydrophilic monomer technology, applied in the field of coatings, can solve the problems of slow printing speed, unstable dispersion of disperse dyes, poor solvent affinity, etc., to improve stability, improve dispersibility and stability, and reduce surface energy. Effect

Active Publication Date: 2020-05-08
TRENDVISION TECH(ZHUHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although inkjet digital printing has the above advantages, the dispersion of disperse dyes in the ink used in the inkjet digital printing process is unstable, which can easily lead to clogged nozzles, resulting in broken holes, oblique spray or no ink.
[0003] The dispersants used in the prior art, such as traditional small molecule dispersants or polymer dispersants, have too few or too weak adsorption points for disperse dyes, such as red disperse dyes, and the solvation chain is too short or too weak. Too long, too poor solvent affinity to generate sufficient steric hindrance or electrostatic repulsion
Therefore, it is impossible to obtain a water-based color paste with strong dispersion and high stability, and it is also impossible to obtain ink with good stability, which leads to the precipitation and sedimentation of disperse dyes to block the print nozzle
In order to improve the nozzle clogging problem, in the prior art, the multi-pass printing method of multiple scanning interpolation points is used to overcome it, but the printing speed is slow

Method used

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  • Color paste for water-based ink and preparation method thereof
  • Color paste for water-based ink and preparation method thereof
  • Color paste for water-based ink and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Embodiment 1: the preparation of dispersion agent (SA1)

[0067] (1) Mix 55g of methacrylic acid, 10g of acrylamide and 385g of o-phenylphenoxyethyl acrylate to obtain mixture a;

[0068] (2) Introduce nitrogen into the reaction flask with condensing reflux device, add 317g butanone and 163g isopropanol, heat to 70-80°C, then add 60g butanone and 10g azobisisoheptanonitrile and mix and stir To dissolve, obtain mixture b;

[0069] (3) Mix the mixture a and the mixture b, and slowly add it into the reaction bottle for reaction. At 70° C., after 7 hours of reaction, the amount of residual monomer is detected to be less than 5%, and the reaction is terminated to obtain a dispersant.

[0070] Add 2-pyrrolidone to the dispersant prepared in step (3) (the mass ratio of dispersant to 2-pyrrolidone is 1:0.54), heat to 100°C to remove the organic solvent in the dispersant, and then add deionized water, adjust the pH to 9 to obtain a dispersant solution, and the mass fraction of...

Embodiment 2

[0073] Embodiment 2: the preparation of dispersion agent (SA2)

[0074] (1) 330g H 2 C=CCH 3 CO 2 (CH 2 CH 2 O) n CH 3 n=50, 20g of N-vinylpyrrolidone and 100g of 2-phenoxyethyl acrylate were mixed to obtain mixture a;

[0075] (2) Introduce nitrogen into the reaction flask equipped with a condensing reflux device, add 344g of ethyl acetate and 164g of isopropanol as solvents, heat to 70-80°C, then add 36g of ethyl acetate and 6g of azobisisobutyl Nitriles are mixed and stirred until dissolved to obtain mixture b;

[0076] (3) Then mix the mixture a and the mixture b, and slowly add it into the reaction bottle for reaction at the same time. After 4 hours at 80° C., the residual monomer amount is detected to be less than 5% to stop the reaction and obtain a dispersant.

[0077] Add 2-pyrrolidone to the dispersant prepared in step (3) (the mass ratio of dispersant to 2-pyrrolidone is 1:0.544), heat to 100°C to remove the organic solvent in the dispersant, and then add d...

Embodiment 3

[0081] A preparation method of color paste, comprising the following steps:

[0082] (1) get the dispersant solution 508g that embodiment 1 makes and 1092g deionized water, stir and mix, make premixed solution;

[0083] (2) 400g red disperse dye (III) is added in the premixed solution that step (1) prepares, stir and mix, import sand mill to grind then, the particle diameter of the premixed solution obtained by grinding is 100-200nm, filter, Take the filtrate to obtain the color paste.

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Abstract

The invention belongs to the field of paint, and discloses color paste for water-based ink, which is mainly prepared from the following raw materials in parts by mass: 200 to 600 parts of a disperse dye, 100 to 500 parts of a dispersing agent and 500 to 1200 parts of a solvent. The dispersing agent contains phenyl, a nitrogen-containing group and a hydrophilic group. The color paste is prepared bythe following steps: (1) weighing raw material components according to the formula ratio, adding the dispersing agent into the solvent, and stirring and mixing to prepare a premixed solution, and (2)adding the disperse dye into the premixed solution prepared in the step (1), carrying out stirring and mixing, grinding and filtering, and taking the filtrate to obtain the color paste. The dispersing agent not only contains an anchoring structure and can have strong adsorption capacity with the surface of the disperse dye and reduce the surface energy of the disperse dye, but also contains a hydrophilic structure, so that the stability of the color paste in water can be effectively improved. Therefore, the color paste stability is improved in water. The color paste prepared by the inventionis applied to water-based ink, and is applied to a high-speed printing process, so that a spray head is not easy to block.

Description

technical field [0001] The invention belongs to the field of coatings, in particular to a color paste for water-based ink and a preparation method thereof. Background technique [0002] Traditional textile printing requires a large amount of water to clean the slurry and uncolored pigments, resulting in a large amount of waste water; the drying of the fabric during the printing and dyeing process requires a lot of heat energy; and the amount of ink required for screen printing is much higher than that of inkjet digital printing. The amount of ink required for printing is much higher. Inkjet digital printing requires less ink, and its resolution and accuracy are higher than screen printing. Due to the low ink consumption of inkjet digital printing, the energy required for the transfer and drying process is significantly lower than that of traditional textile printing, and even drying is not required, which has great advantages for the high-speed textile printing and dyeing i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D17/00C09D11/328D06P5/30D06P1/18D06P1/20
CPCC09D17/003C09D11/328D06P5/30D06P1/18D06P1/20
Inventor 刘明辉杨锦勇张金红
Owner TRENDVISION TECH(ZHUHAI) CO LTD
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