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A kind of dispersant and preparation method and application

A technology of dispersant and auxiliary agent, applied in the field of dispersant and preparation, can solve the problems of inability to generate enough steric hindrance or electrostatic repulsion, weak adsorption capacity of anchor base adsorption point, hard precipitation particles of white color paste, etc. Dispersibility and stability, good redispersibility, and the effect of reducing surface energy

Active Publication Date: 2021-05-11
TRENDVISION TECH(ZHUHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using traditional small-molecule dispersants or polymer dispersants, the anchoring group has too few adsorption points or too weak adsorption capacity for white pigments, and the solvation chain has defects that are too short or too long, and has poor affinity for solvents, making it impossible to produce Sufficient steric hindrance or electrostatic repulsion, resulting in the prepared white color paste prone to hard precipitation and coarse particles

Method used

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  • A kind of dispersant and preparation method and application
  • A kind of dispersant and preparation method and application
  • A kind of dispersant and preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Nitrogen gas was introduced into the reaction flask equipped with a condensing reflux device, and 290g of butanone and 140g of isopropanol were added as solvents, and heated to 70-80°C; then 52g of methyl acrylate, 78g of butyl acrylate, 70g of Mix hydroxyethylacrylamide and 300g polyethylene glycol methyl ether methacrylate (M=2000) as a branched macromer to obtain premix A; then mix 60g methyl ethyl ketone and 10g azobisisobutyronitrile Stir until dissolved to obtain premix B; then slowly add premix A and premix B into the reaction bottle for reaction; after about 4-7 hours of reaction, detect that the amount of residual monomer is less than 5% to terminate the reaction; then add Mix 490g of 2-pyrrolidone evenly, heat to 100°C to remove butanone and isopropanol, cool to room temperature, add deionized water to a total mass of 1250g, and obtain a SA1 dispersant solution with a solid content of 40%; the SA1 dispersant The molecular weight is about 30000, including the f...

Embodiment 2

[0042] Nitrogen gas was passed into the reaction flask equipped with a condensing reflux device, and 304g of ethyl acetate and 140g of isopropanol were added as solvents, and heated to 70-80°C; then 26g of the main chain monomer methyl acrylate, 39g of butyl acrylate, 35g fumaric acid, and branched chain macromer 400g sodium vinyl sulfonate and monofunctional oligomer (M=4000) of methyl methacrylate are mixed to obtain premix A; then 48g ethyl acetate and 8g of azobisisoheptanonitrile were mixed and stirred until dissolved to obtain premix B; then premix A and premix B were slowly added to the reaction bottle for reaction; after about 4-7 hours of reaction, detect the residual monomer The reaction was terminated by adding 484g of 2-pyrrolidone and mixed evenly, heated to 100°C to remove ethyl acetate and isopropanol, cooled to room temperature, and adjusted to a pH of 9, then added deionized water to a total mass of 1250g , to obtain a solid content of 40% SA2 dispersant solut...

Embodiment 3

[0045] Take 1000g of dispersant SA1, add 490g of 2-pyrrolidone and mix evenly, heat to 100°C to remove butanone and isopropanol, cool to room temperature, then add deionized water to a total mass of 1250g to obtain a dispersant with a solid content of 40% Solution; mix 180g of dispersant solution with 320g of deionized water, stir until completely dissolved to obtain an aqueous pre-solution; then mix 500g of white pigment R-706 with the aqueous pre-solution, stir to completely wet the white pigment to obtain an aqueous pre-dispersion liquid; the water-based pre-dispersed liquid is introduced into a sand mill for grinding until the average particle size is 200-300nm; the colloid and large-size particles are removed by filtration to obtain a water-based white color paste with stable dispersion.

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Abstract

The invention belongs to the field of printing consumables, and discloses a dispersant. The dispersant is composed of a main chain and a branch chain. The main chain includes a hydrophobic base structural unit represented by formula (I), and the main chain also includes a formula ( II) the base-containing structural unit represented by or / and the carboxyl-containing structural unit represented by formula (III); the branched chain includes the hydrophilic-based structural unit represented by formula (IV) or formula (V), x=10- 220, y=2-30; z=3-60; the molecular weight of the dispersant is 5000-100000.

Description

technical field [0001] The invention belongs to the field of printing consumables, and in particular relates to a dispersant and its preparation method and application. Background technique [0002] The water-based white digital printing ink has good masking ability, which can cover the defects on the substrate, and improve the contrast and vividness of the color digital printing ink in the surface printing mode or the back printing mode. In the surface printing mode, the color image is attached to the coating of white digital printing ink, so that the color image stands out against the white background; in the reverse printing mode, the color image is printed on a transparent substrate, and then the white digital printing ink is applied Printing ink is deposited on this color image, and the final image is viewed through the transparent substrate. The higher the whiteness, the more vivid the relative color contrast. In order to obtain high whiteness, it is preferable to us...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/14C08F220/18C08F220/58C08F222/02C08F265/06C08F265/04C09D11/322
CPCC08F265/04C08F265/06C08F283/065C09D11/322C08F220/14C08F220/58C08F222/02
Inventor 刘明辉杨锦勇张金红
Owner TRENDVISION TECH(ZHUHAI) CO LTD
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