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CN-121991552-A - Preparation process of polymer coated self-crosslinking dispersant modified pigment ink

CN121991552ACN 121991552 ACN121991552 ACN 121991552ACN-121991552-A

Abstract

The invention relates to the technical field of ink-jet printing ink, in particular to a preparation process of polymer coated self-crosslinking dispersant modified pigment ink, which comprises the following steps of weighing anchoring monomers, hydrophilic monomers and crosslinking monomers according to a mass ratio of 3:5:2, adding deionized water into a dispersion tank and self-crosslinking dispersant prepared in the step one, coating the polymer by adopting a core-shell miniemulsion polymerization method, adding a water-soluble solvent, a defoaming agent and a bactericide into polymer coated pigment emulsion prepared in the step three, wherein the self-crosslinking dispersant has an anchoring group, a hydrophilic chain and a crosslinkable active site, the anchoring group can be tightly adsorbed on the surface of the pigment, the hydrophilic chain provides steric hindrance to realize preliminary stabilization, and the active site participates in crosslinking reaction in the subsequent polymerization process, so that the dispersant and the coated polymer form covalent bonding, the interfacial bonding force of the dispersant and the pigment and a coating layer is remarkably improved, and the desorption and agglomeration of the dispersant and the pigment are effectively avoided.

Inventors

  • Qiu Xianzhou
  • LI JIAWEI
  • QI DONGMING

Assignees

  • 现代纺织技术创新中心(鉴湖实验室)

Dates

Publication Date
20260508
Application Date
20260319

Claims (8)

  1. 1. The preparation process of the polymer coated self-crosslinking dispersant modified pigment ink is characterized by comprising the four steps of self-crosslinking dispersant synthesis, nano pigment color paste preparation, polymer coating and self-crosslinking, ink compounding and debugging; the self-crosslinking dispersing agent is prepared by weighing an anchoring monomer, a hydrophilic monomer and a crosslinking monomer according to a mass ratio of 3:5:2, and mixing to obtain a monomer mixture; Step two, the nano pigment color paste is prepared by adding deionized water and the self-crosslinking dispersing agent prepared in the step one into a dispersion tank, stirring and dissolving, wherein the dosage of the self-crosslinking dispersing agent is 50% -200% of the mass of the pigment added later, and the mass ratio of the pigment to zirconia beads, the self-crosslinking dispersing agent and the zirconia beads to the deionized water is 1:1-2:5-10:10-20; step three, the polymer coating adopts a core-shell miniemulsion polymerization method, and the nano pigment color paste, the core layer monomer and the shell layer monomer prepared in the step two are weighed according to the mass ratio of 10:3:2; and step four, adding a water-soluble solvent, a defoaming agent and a bactericide into the polymer coated pigment emulsion prepared in the step three, wherein the dosage of the water-soluble solvent is 5-20% of the mass of the polymer coated pigment emulsion.
  2. 2. The process for preparing polymer-coated self-crosslinking dispersant modified pigment ink according to claim 1, wherein the anchoring monomer in the first step is carboxylic acid, sulfonic acid or carboxylic acid+amide compound group, the hydrophilic monomer is PEGMA or NVP, and the crosslinking monomer is DVB.
  3. 3. The preparation process of the polymer coated self-crosslinking dispersant modified pigment ink according to claim 1, wherein in the second step, the particle size of the nano pigment color paste is controlled to be 70-100nm, PDI is less than 0.2, zeta potential absolute value is more than or equal to 30mV, grinding rotation speed is 3000-4500r/min, grinding time is 4-6h, and ultrasonic treatment and centrifugal impurity removal are assisted.
  4. 4. The preparation process of the polymer coated self-crosslinking dispersant modified pigment ink according to claim 1, wherein in the third step, the mass ratio of core-shell monomers is 3:2, the amount of crosslinking monomers is 5% -15% of the mass of shell monomers, the particle size of miniemulsion is less than 200nm, the polymerization temperature of a core layer is 60-70 ℃, the polymerization temperature of a shell layer is 75-85 ℃, and the crosslinking degree is more than or equal to 80%.
  5. 5. The process for preparing polymer-coated self-crosslinking dispersant-modified pigment ink according to claim 1, wherein the core monomer is soft monomer Butyl Acrylate (BA) and the shell monomer is hard monomer Methyl Methacrylate (MMA).
  6. 6. The process for preparing polymer-coated self-crosslinking dispersant modified pigment ink according to claim 1, wherein the amount of defoamer and bactericide in the fourth step is 0.1% -1% of the mass of the polymer-coated pigment emulsion.
  7. 7. The process for preparing polymer-coated self-crosslinking dispersant-modified pigment ink according to claim 1, wherein the water-soluble solvent in the prepared polymer-coated self-crosslinking dispersant-modified pigment ink is a mixture of propylene glycol and glycerol in a mass ratio of 2:1 or a mixture of propylene glycol and ethylene glycol in a mass ratio of 1:1.
  8. 8. The preparation process of the polymer coated self-crosslinking dispersant modified pigment ink according to claim 1, wherein a color paste purification and stability pre-detection mechanism can be additionally arranged between the second step and the third step according to actual conditions.

Description

Preparation process of polymer coated self-crosslinking dispersant modified pigment ink Technical Field The invention relates to the technical field of ink-jet printing ink, in particular to a preparation process of polymer-coated self-crosslinking dispersant modified pigment ink. Background The ink jet printing technology has the advantages of non-contact, high precision, high efficiency and the like, and is widely applied to the fields of package printing, textile printing, advertisement manufacturing and the like. Pigment ink is used as a core consumable material for inkjet printing, and the performance of the pigment ink directly determines the printing quality and the application effect. Compared with dye ink, pigment ink has the advantages of light resistance, water resistance, friction resistance and the like, but pigment is water insoluble particles, is easy to agglomerate in a water phase system, causes poor ink stability, is easy to block a spray head during printing, and limits further application. In order to solve the problem of pigment dispersion stability, the prior art mostly adopts a mode of adding a dispersing agent, and the anchoring group of the dispersing agent is adsorbed on the surface of the pigment, so that a hydrophilic chain stretches in a water phase to form steric hindrance, and stable dispersion of the pigment is realized. However, the traditional dispersing agent has the defects of insufficient anchoring force, limited steric effect and the like, and is easy to desorb to cause pigment agglomeration under long-term storage or severe environment (such as high temperature and low temperature). In addition, the pigment ink which is stabilized by the dispersant only has weaker adhesive force of the pigment on the surface of the printing stock after printing, and the friction resistance and migration resistance are required to be improved. The polymer coating modification technology can remarkably improve the dispersion stability and interfacial compatibility of the pigment by constructing a polymer coating layer on the surface of the pigment, however, the existing polymer coating technology has the problems of uneven coating layer, weak binding force with the surface of the pigment, difficult precise control of crosslinking degree and the like, so that the long-term stability and the post-printing performance of the ink still cannot meet the high-end application requirements, and therefore, the preparation technology of the polymer coating type self-crosslinking dispersant modified pigment ink is provided for solving the problems. Disclosure of Invention The invention aims to provide a preparation process of polymer coated self-crosslinking dispersant modified pigment ink, which solves the problems in the prior art. In order to achieve the above purpose, the present invention provides the following technical solutions: the preparation process of the polymer coated self-crosslinking dispersant modified pigment ink comprises the four steps of self-crosslinking dispersant synthesis, nano pigment color paste preparation, polymer coating and self-crosslinking, ink compounding and debugging; the self-crosslinking dispersing agent is prepared by weighing an anchoring monomer, a hydrophilic monomer and a crosslinking monomer according to a mass ratio of 3:5:2, and mixing to obtain a monomer mixture; Step two, the nano pigment color paste is prepared by adding deionized water and the self-crosslinking dispersing agent prepared in the step one into a dispersion tank, stirring and dissolving, wherein the dosage of the self-crosslinking dispersing agent is 50% -200% of the mass of the pigment added later, and the mass ratio of the pigment to zirconia beads, the self-crosslinking dispersing agent and the zirconia beads to the deionized water is 1:1-2:5-10:10-20; step three, the polymer coating adopts a core-shell miniemulsion polymerization method, and the nano pigment color paste, the core layer monomer and the shell layer monomer prepared in the step two are weighed according to the mass ratio of 10:3:2; and step four, adding a water-soluble solvent, a defoaming agent and a bactericide into the polymer coated pigment emulsion prepared in the step three, wherein the dosage of the water-soluble solvent is 5-20% of the mass of the polymer coated pigment emulsion. In the first step, the anchoring monomer is carboxylic acid, sulfonic acid or carboxylic acid+amide composite group, the hydrophilic monomer is PEGMA or NVP, and the crosslinking monomer is DVB. In the second step, the particle size of the nano pigment color paste is controlled to be 70-100nm, PDI is less than 0.2, zeta potential absolute value is more than or equal to 30mV, grinding rotating speed is 3000-4500r/min, grinding time is 4-6h, and ultrasonic treatment and centrifugal impurity removal are carried out. In the third step, the mass ratio of the core-shell monomer is 3:2, the dosage of the crosslinking monomer is 5% -15% of the