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CN-122011252-A - Anionic hyperdispersant, modified phthalocyanine blue, and preparation method and application thereof

CN122011252ACN 122011252 ACN122011252 ACN 122011252ACN-122011252-A

Abstract

The invention relates to an anionic hyperdispersant, modified phthalocyanine blue and a preparation method and application thereof, wherein the hyperdispersant is formed by copolymerizing styrene, a polymerizable monomer and a cross-linking agent, the polymerizable monomer is selected from sodium vinyl phosphate, sodium acrylate, sodium vinyl benzoate or sodium styrene sulfonate, the cross-linking agent is selected from N, N-methylene bisacrylamide or divinylbenzene, and the hyperdispersant is preferably formed by copolymerizing styrene, sodium acrylate and N, N-methylene bisacrylamide. The modified phthalocyanine blue comprises the phthalocyanine blue and the anionic hyperdispersant coated on the surface of the phthalocyanine blue, and the hyperdispersant can improve the dispersibility of the phthalocyanine blue pigment, and the modified phthalocyanine blue has high coloring degree, strong stability in water and higher application value.

Inventors

  • CAO FUHU
  • YAN YONGLIN
  • HOU YUBO
  • HE ZHUYUN
  • ZHANG CHUANLING
  • NI GANG
  • LIU JUAN

Assignees

  • 合肥工业大学

Dates

Publication Date
20260512
Application Date
20260202

Claims (10)

  1. 1. The anionic hyperdispersant is characterized by being formed by copolymerizing styrene, a polymerizable monomer and a crosslinking agent, wherein the polymerizable monomer is selected from sodium vinylphosphate, sodium acrylate, sodium vinylbenzoate or sodium styrenesulfonate, and the crosslinking agent is selected from N, N-methylene bisacrylamide or divinylbenzene.
  2. 2. The anionic hyperdispersant of claim 1, wherein the polymerizable monomer is sodium acrylate, the crosslinking agent is N, N-methylenebisacrylamide, and the hyperdispersant has the structural formula: wherein, the x is more than or equal to 2 and less than or equal to 5, y is more than or equal to 10 and less than or equal to and z is more than or equal to 50 and less than or equal to 10 and less than or equal to 50.
  3. 3. The anionic hyperdispersant according to claim 1 or 2, wherein the hyperdispersant is prepared from the following raw materials: 2.4-2.6 parts by weight of acrylic acid, 1.2-1.5 parts by weight of sodium hydroxide, 0.1-0.2 part by weight of potassium persulfate, 0.2-0.3 part by weight of N, N-methylenebisacrylamide, and 1-5 parts by weight of styrene.
  4. 4. A process for preparing an anionic hyperdispersant as claimed in claim 3, comprising the steps of: (1) Dispersing acrylic acid, sodium hydroxide, sodium persulfate and N, N-methylene bisacrylamide in a solvent to obtain a water phase; (2) Adding styrene into the water phase, and performing ultrasonic emulsification to obtain an oil-in-water emulsion; (3) And (3) carrying out polymerization reaction on the oil-in-water emulsion under the nitrogen bubbling condition to obtain the anionic hyperdispersant.
  5. 5. A modified phthalocyanine blue comprising a phthalocyanine blue and the anionic hyperdispersant of any one of claims 1 to 3 coated on the surface of the phthalocyanine blue.
  6. 6. The process for producing a modified phthalocyanine blue according to claim 5, comprising the steps of: (1) Dispersing acrylic acid, sodium hydroxide, sodium persulfate and N, N-methylene bisacrylamide in a solvent to obtain a water phase; (2) Adding styrene and phthalocyanine blue raw materials into an aqueous phase, and performing ultrasonic emulsification to obtain a phthalocyanine blue pre-dispersion liquid; (3) And (3) carrying out polymerization reaction on the phthalocyanine blue pre-dispersion liquid at the temperature of 60-80 ℃ after pre-polymerizing at the temperature of 40-50 ℃ under the condition of nitrogen bubbling, so as to obtain the modified phthalocyanine blue.
  7. 7. The process according to claim 6, wherein the mass ratio of the phthalocyanine blue raw material to the acrylic acid is 1.5 to 2.5.
  8. 8. The method according to claim 6, wherein the dispersing process in the step (1) is performed in a stirring state at a stirring speed of 400 to 500rpm.
  9. 9. The modified phthalocyanine blue according to claim 5, wherein the contact angle of water on the surface of the modified phthalocyanine blue is 50 to 75 °.
  10. 10. Use of an anionic hyperdispersant according to claim 1 or 2, or of a modified phthalocyanine blue according to claim 5 or 9 in the fields of paint, ink, plastic, rubber, cosmetics or pharmaceuticals.

Description

Anionic hyperdispersant, modified phthalocyanine blue, and preparation method and application thereof Technical Field The invention relates to the field of preparation of anionic dispersing agents, in particular to the field of preparation of anionic dispersing agents for organic pigments, and specifically relates to an anionic hyperdispersing agent, modified phthalocyanine blue, and a preparation method and application thereof. Background Some ultrafine powder such as pigment has smaller particle size, larger specific surface area and higher specific surface energy, and the particles are mutually attracted and agglomerated into larger particles under the action of hydrogen bonds and Van der Waals force among the particles, so that the problem that the pigment is difficult to disperse and sedimentation occurs in practical application exists, and therefore, a dispersing agent is required to be added to disperse the pigment in the application process of the pigment. The dispersing agent is not only suitable for dispersing fillers, but also can be used for dispersing various solid particles such as carbon black, titanium pigment, metal powder and the like, and is widely applied to industries such as paint, printing ink, plastics, rubber, cosmetics, medicines and the like. Conventional dispersants include Polyurethane (PU), polyacrylic acid (PAA), polyvinyl alcohol (PVA) and derivatives thereof, and polyelectrolytes. The dispersants are mainly adsorbed on the pigment through classical hydrogen bonds or electrostatic interactions, are difficult to maintain stability for a long time, have the defects of large addition amount, easiness in generating foam and the like, and have limited complexation stabilizing effect on metal ions on the surfaces of a plurality of solid particles. The hyper-dispersant is a high molecular dispersant, which has a special molecular structure and comprises a hydrophilic group and a hydrophobic group, wherein an anchoring group on the molecular structure can be tightly adsorbed on the surface of the ultra-fine powder to prevent desorption, and a solvation chain has good compatibility with a dispersing medium, adopts a comparatively extended conformation in the dispersing medium, and forms a protective layer with enough thickness on the surface of solid particles. At present, although many polymeric dispersants have been developed, most of these dispersants have complex synthetic processes, relatively weak interactions with pigments, and limited types of pigments are suitable. It is therefore desirable to be able to develop dispersants which form a stronger interaction with pigments. Disclosure of Invention The invention solves the technical problems that the existing polymer dispersing agent for pigment has weaker interaction with pigment particles, and the dispersion stability of pigment in water, pigment glossiness and coloring strength are all required to be improved. In order to solve the technical problems, the invention provides a high molecular polymer type hyper-dispersant, wherein the dispersant coats original phthalocyanine blue by a microcapsule technology to obtain modified phthalocyanine blue pigment. The hyper-dispersant has heat resistance and high dispersibility, the appearance of the coated pigment is more full, the aggregation problem of the pigment is improved, the particle size of the pigment is reduced by about 180 nm-230 nm from 363.2 nm, the zeta potential is increased from-3.1 mV to-41.1 mV, the dispersion stability of the pigment in water is improved, and the glossiness and the coloring strength of the pigment are further improved. Specifically, aiming at the defects in the prior art, the invention provides the following technical scheme: The anionic hyperdispersant is characterized by being formed by copolymerizing styrene, a polymerizable monomer and a crosslinking agent, wherein the polymerizable monomer is selected from sodium vinylphosphate, sodium acrylate, sodium vinylbenzoate or sodium styrenesulfonate, and the crosslinking agent is selected from N, N-methylene bisacrylamide or divinylbenzene. Preferably, in the above-mentioned anionic hyperdispersant, the polymerizable monomer is sodium acrylate, the crosslinking agent is N, N-methylenebisacrylamide, and the structural formula of the hyperdispersant is: wherein, the x is more than or equal to 2 and less than or equal to 5, y is more than or equal to 10 and less than or equal to and z is more than or equal to 50 and less than or equal to 10 and less than or equal to 50. Preferably, in the above-mentioned anionic hyperdispersant, the hyperdispersant is prepared from the following raw materials: 2.4-2.6 parts by weight of acrylic acid, 1.2-1.5 parts by weight of sodium hydroxide, 0.1-0.2 part by weight of potassium persulfate, 0.2-0.3 part by weight of N, N-methylenebisacrylamide, and 1-5 parts by weight of styrene. Preferably, the weight portion of the styrene is 2.0-2.5. The invention also provides a pr