阅读说明：本技术 一种含多元结构的分散剂及含其的色浆、uv喷墨 (Dispersant containing multi-element structure, color paste containing dispersant and UV ink jet ) 是由 刘明辉 梁文龙 杨飞虎 于 2020-04-17 设计创作，主要内容包括：本发明属于材料领域,公开了一种含多元结构的分散剂,主要由以下原料反应制得：单体A,单体B、单体C、起始剂和溶剂；所述单体A含苯环；所述单体B为含有直链碳结构的酯；所述单体C为酸或酯。还公开了一种含该分散剂的色浆和含该色浆的UV喷墨。该分散剂分子中包含颜料锚定结构、缓冲结构及溶剂化结构,利用颜料锚定结构强化分散剂对颜料的吸附能力,利用缓冲结构区隔锚定结构与溶剂化结构,避免锚定结构与溶剂化结构相互干扰,溶剂化结构则增加分散剂在溶剂中的溶解性,使得颜料颗粒间产生足够的排斥力或空间位阻,使颜料颗粒间不易絮凝或产生沉淀,分散稳定性好。UV喷墨的稳定性好,打印过程不易出现喷头堵塞、墨滴斜喷或断墨等现象。(The invention belongs to the field of materials, and discloses a dispersant containing a multi-element structure, which is mainly prepared by the following raw materials: monomer A, monomer B, monomer C, initiator and solvent; the monomer A contains a benzene ring; the monomer B is an ester containing a straight chain carbon structure; the monomer C is acid or ester. Also discloses a color paste containing the dispersant and UV ink-jet containing the color paste. The dispersing agent molecule comprises a pigment anchoring structure, a buffer structure and a solvation structure, the pigment anchoring structure is used for strengthening the adsorption capacity of the dispersing agent on the pigment, the buffer structure is used for separating the anchoring structure from the solvation structure, the mutual interference between the anchoring structure and the solvation structure is avoided, the solvation structure is used for increasing the solubility of the dispersing agent in a solvent, so that sufficient repulsive force or steric hindrance is generated among pigment particles, the pigment particles are not easy to flocculate or precipitate, and the dispersion stability is good. The UV ink-jet stability is good, and the phenomena of nozzle blockage, ink drop oblique jet or ink break and the like are not easy to occur in the printing process.)

1. The dispersing agent is characterized by being prepared by the reaction of the following raw materials: monomer A, monomer B, monomer C, initiator and solvent; the monomer A contains a benzene ring; the monomer B is an ester containing a straight chain carbon structure; the monomer C is acid or ester.

2. The dispersant according to claim 1, wherein the monomers A, B and C are used in a molar ratio of (0.5-5): (0.5-5): (1-8).

3. The dispersant of claim 1, wherein monomer a is selected from at least one of benzyl acrylate, benzyl methacrylate, phenyl acrylate, phenyl methacrylate, o-phenylphenoxyethyl acrylate, 2-phenoxyethyl acrylate, ethylene glycol phenyl ether methacrylate, poly (ethylene glycol) phenyl ether acrylate, ethoxylated nonylphenol acrylate, poly (propylene glycol) -4-nonylphenyl ether acrylate, styrene, methyl styrene, styrene sulfonic acid, vinyl toluene, p-methyl styrene, or divinyl benzene.

4. Dispersant according to claim 1, characterized in that said ester containing a linear carbon structure is selected from at least one of methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, propyl acrylate, propyl methacrylate, butyl acrylate or butyl methacrylate.

5. Dispersant according to claim 1, characterized in that said monomer C is selected from at least one of acrylic acid, methacrylic acid, maleic acid, fumaric acid, tetrahydrofurfuryl acrylate, tetrahydrofurfuryl methacrylate, dicyclopentadienyl acrylate, trimethylol cyclohexyl acrylate, ethoxyethoxyethyl acrylate or isobornyl methacrylate.

6. A method for preparing the dispersant of any one of claims 1 to 5, comprising the steps of:

(1) stirring and mixing the monomer A, the monomer B and the monomer C to prepare a mixture a for later use;

(2) stirring and mixing an initiator and a solvent under the inert gas atmosphere to prepare a mixture b for later use;

(3) and mixing the mixture a and the mixture b, and heating for reaction to obtain the dispersing agent.

7. The method according to claim 6, wherein the mass ratio of the initiator to the monomer C in the step (2) is (1-30) to (40-800).

8. A mill base characterized in that it comprises the dispersant, mill base monomer solvent, pigment according to any one of claims 1 to 5.

9. The color paste according to claim 8, further comprising an auxiliary agent.

10. A UV inkjet comprising the paste according to claim 8 or 9.

Technical Field

The invention belongs to the field of materials, and particularly relates to a dispersant containing a multi-element structure, color paste containing the dispersant, and UV ink jet.

Background

The UV ink (or referred to as UV inkjet) is jet printed on a medium, and is cured and formed by UV light (ultraviolet light), so that the UV ink can be 100% transferred to the medium, and therefore, the UV ink is also referred to as environment-friendly ink. UV inks have taken up a significant share in the traditional ink market, but only a small portion of the ink jet printing market. This is because, in the inkjet printing process, it is necessary to use an ink having a low viscosity and high stability due to the operating conditions of the printing head, which may cause problems such as head clogging, ink droplet slanting, or ink break-up. In the UV ink, the dispersion stability of the oily color paste of the ink is directly related to the dispersion stability of the UV ink. Therefore, the problem to be solved urgently is to improve the dispersion stability of the oil-based color paste in the UV ink.

The conventionally used dispersing agent, such as the conventional small molecular dispersing agent or the single-structure polymer dispersing agent, has too few or too weak molecular chain segments to the adsorption points of the pigment, too short or too long solvating chain segments and too poor affinity to the solvent, and cannot generate enough steric hindrance or electrostatic repulsion, so that the UV oily color paste with strong dispersion and high stability cannot be obtained, and the pigment flocculation precipitation and particle coarsening are easily caused, and the phenomenon of nozzle blockage in the printing process is caused.

Therefore, it is desirable to provide a suitable dispersant, which can stabilize the dispersion of the oily color paste or the UV inkjet containing the dispersant and prevent the occurrence of nozzle clogging, ink drop slant ejection, ink break-up, and the like during printing.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art described above. Therefore, the invention provides a dispersant containing a multi-element structure, and the dispersant is applied to oily color paste, so that the oily color paste can be stably dispersed in ink (such as UV ink jet), and the phenomena of nozzle blockage, oblique ink jet of ink drops or ink break and the like are not easy to occur in the printing process.

The dispersant molecule of the invention contains a pigment anchoring structure, a buffer structure and a solvation structure, and is a dispersant containing a multi-element structure. The pigment anchoring structure is used for enhancing the adsorption capacity of the dispersing agent on the pigment, the buffer structure is used for assisting in separating the anchoring structure from the solvation structure, the mutual interference between the anchoring structure and the solvation structure is avoided, and the solvation structure is used for increasing the solubility of the dispersing agent in the solvent.

A dispersant containing a multi-element structure is mainly prepared by the following raw materials: monomer A, monomer B, monomer C, initiator and solvent; the monomer A contains a benzene ring; the monomer B is an ester containing a straight chain carbon structure; the monomer C is acid or ester.

Preferably, the molar ratio of the monomers A, B and C is (0.5-5): (0.5-5): (1-8); further preferably, the monomer A, the monomer B and the monomer C are used in a molar ratio of (1-3): (1-3): (2-5); more preferably, the monomer A, the monomer B and the monomer C are used in a molar ratio of (1-2): (1-2): (2-4).

The monomer A provides a pigment anchoring structure in a dispersant molecular structure, and most of pigments contain aromatic groups, so that the adsorption capacity of the dispersant on the pigments can be effectively improved when the dispersant contains a benzene ring structure.

The monomer B provides a buffer structure in the molecular structure of the dispersant, and the buffer structure is used for separating the pigment-philic anchoring structure from the solvent-philic solvating structure and avoiding the mutual interference of the anchoring structure and the solvent-philic structure. Because the anchoring structures adsorb the pigment surface, but the solvating structures are dissolved in the solvent (used in formulating the mill base). If the anchoring structures and the solvated structures are too close together, the anchoring structures may not be successfully adsorbed onto the pigment surface or the solvated structures may not be dissolved into the monomer.

The monomer C provides a solvation structure in a molecular structure of the dispersing agent, the solvation structure has good compatibility with a solvent used in color paste preparation, the solubility of the dispersing agent in the color paste is improved, the solvation structure can be fully extended, and the purposes of space obstacle and electrostatic repulsion are achieved.

Preferably, the monomer A is selected from at least one of benzyl acrylate, benzyl methacrylate, phenyl acrylate, phenyl methacrylate, o-phenylphenoxyethyl acrylate, 2-phenoxyethyl acrylate, ethylene glycol phenyl ether methacryl acid, poly (ethylene glycol) phenyl ether acrylic acid, ethoxylated nonylphenol acrylate, poly (propylene glycol) -4-nonylphenyl ether acrylic acid, styrene, methyl styrene, styrene sulfonic acid, vinyl toluene, p-methyl styrene or divinyl benzene.

Preferably, the ester containing a linear carbon structure is at least one selected from the group consisting of methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, propyl acrylate, propyl methacrylate, butyl acrylate and butyl methacrylate.

Preferably, the monomer C is at least one selected from acrylic acid, methacrylic acid, maleic acid, fumaric acid, tetrahydrofurfuryl acrylate, tetrahydrofurfuryl methacrylate, dicyclopentadienyl acrylate, trimethylol cyclohexyl acrylate, ethoxyethoxyethoxyethyl acrylate, and isobornyl methacrylate.

Preferably, the initiator is at least one selected from the group consisting of azobisisoheptonitrile, azobisisobutyronitrile, azobisisovaleronitrile, dimethyl azobisisobutyrate, azobisisobutyramidine hydrochloride, azobisisobutyrimidazoline hydrochloride, azobisisobutyronitrile formamide, and azobiscyclohexylcarbonitrile. The initiator mainly has the function of generating reaction free radicals by thermal decomposition and initiating monomers to carry out free radical polymerization.

Preferably, the solvent is selected from at least one of ethanol, propanol, isopropanol, butanone, methyl isobutyl ketone, ethyl acetate, isopropyl acetate, dichloromethane, acetone, dichloroethane, toluene, xylene, tetrahydrofuran, or cyclohexanone; further preferably, the solvent is selected from at least one of acetone, isopropanol, methyl ethyl ketone, or ethyl acetate.

A preparation method of a dispersant containing a multi-element structure comprises the following steps:

(1) stirring and mixing the monomer A, the monomer B and the monomer C to prepare a mixture a for later use;

(2) stirring and mixing an initiator and a solvent under the inert gas atmosphere to prepare a mixture b for later use;

(3) mixing the mixture a and the mixture b, and heating for reaction to obtain the dispersant containing the multi-element structure;

the amount of the solvent used in the step (2) is not particularly limited, and the initiator can be sufficiently dissolved.

Preferably, the mass ratio of the initiator to the monomer C in the step (2) is (1-30) to (40-800); further preferably, the mass ratio of the initiator to the monomer C in the step (2) is (5-15): 50-400.

Preferably, the heating reaction in the step (3) is carried out at a temperature of 60 to 100 ℃ for 1 to 4 hours.

Preferably, after the step (3), 2-pyrrolidone is added into the dispersant prepared in the step (3) (the mass ratio of the dispersant to the 2-pyrrolidone is 1 (0.3-0.8)), the mixture is heated to 120 ℃ for removing the organic solvent in the dispersant, and then deionized water is added for adjusting the pH value to 8-12 and ensuring that the mass fraction of the dispersant is 25-65%, so that the dispersant is beneficial to preparing color paste.

When the residual quantity of the monomer A, the monomer B and the monomer C after the reaction in the step (3) is less than 5 percent, the reaction is relatively sufficient.

A color paste comprises the following components: the color paste comprises a dispersant with a multi-element structure, a color paste monomer solvent (the solvent contained in the color paste) and a pigment.

Preferably, the mill base monomer solvent is selected from one or more of tetrahydrofurfuryl acrylate, cyclo-trimethylolpropane formal acrylate, trimethylol cyclohexyl acrylate, benzyl acrylate, isobornyl acrylate, ethoxyethoxyethyl acrylate, 2-phenoxyethyl acrylate, poly (ethylene glycol) phenyl ether acrylic acid, 1, 6-hexanediol diacrylate, 1, 6-hexanediol ethoxy acid diacrylate, neopentyl glycol polymethylethylene oxide diacrylate, tripropylene glycol diacrylate, dipropylene glycol diacrylate, triethylene glycol diacrylate, etc.

Preferably, the pigment is a pigment of various colors, such as a red pigment, a yellow pigment, a blue pigment, or a black pigment. Available from BASF (BASF), Clariant (Clariant), japanese ink (DIC), mitsubishi (Mitubishi) chemistry, Bayer (Bayer), and others.

Further preferably, the red pigment is selected from at least one of PV19, PR122, PR146, PR254 or PR 269.

Further preferably, the yellow pigment is at least one selected from the group consisting of PY12, PY17, PY74, PY138, PY150, PY151, PY155, PY168, PY180, PY183, PY185, and PY 194.

Further preferably, the blue pigment is selected from at least one of PB15:1, PB15:2, PB15:3 or PB15: 4.

Further preferably, the black pigment is carbon black.

Preferably, the color paste comprises the following components in parts by weight: 30-450 parts of dispersing agent, 850 parts of color paste monomer solvent 350-300 parts of pigment.

Further preferably, the color paste comprises the following components in parts by weight: 50-350 parts of dispersing agent, 800 parts of color paste monomer solvent and 200 parts of pigment.

Preferably, the color paste also comprises an auxiliary agent; further preferably, the auxiliary agent comprises a multiplying agent and/or a polymerization inhibitor.

Preferably, the polymerization inhibitor is at least one selected from hydroquinone, methylhydroquinone, p-hydroxyanisole, 2-tert-butylhydroquinone, 2, 5-di-tert-butylhydroquinone, p-hydroxyanisole, 2, 6-di-tert-butyl-4-methylphenol, p-tert-butylcatechol, GENORAD 16/18/20/22/23 from RAHN, Switzerland, and S100/110/210/130 from Cyanut chemical company. The method has the purpose of stabilizing the color paste monomer solvent and preventing the color paste monomer solvent from easily generating polymerization reaction under the external stimulation.

Preferably, the multiplying agent is selected from Solsperse 5000/22000 of Lubrium. The application of the pigment dispersion agent is to assist the dispersing agent, assist the dispersing agent to be adsorbed on the surface of the pigment and improve the dispersion stability.

Further preferably, the color paste comprises 0-5 parts of multiplying agent.

Further preferably, the color paste comprises 0-5 parts of polymerization inhibitor.

Preferably, the color paste is an oily color paste.

The preparation method of the color paste comprises the following steps:

(1) weighing the components according to the formula ratio, adding the dispersing agent into the color paste monomer solvent, and stirring and mixing to prepare a premixed solution;

(2) and (2) adding the pigment into the premixed solution prepared in the step (1), stirring and mixing, then grinding, filtering, and taking the filtrate to obtain the color paste.

Preferably, the auxiliary agent is added in step (1) before stirring and mixing.

Preferably, the particle size of the mixed solution obtained after grinding in the step (2) is 50-300 nm; further preferably, the particle size of the mixed solution obtained after the grinding in the step (2) is 100-200 nm.

The filtering in the step (2) is to remove colloids and large-particle-size particles.

The UV ink comprises the color paste.

The dispersant prepared by the invention can generate enough repulsive force or steric hindrance among pigment particles, so that the pigment particles are not easy to flocculate or precipitate, and the dispersion stability is good, therefore, the prepared UV ink jet is not easy to generate pigment flocculation precipitation or anti-thickening phenomenon, the stability of the UV ink jet is good, and the phenomena of nozzle blockage, ink drop oblique jet or ink break and the like are not easy to occur in the printing process.

Compared with the prior art, the invention has the following beneficial effects:

(1) the dispersant molecule containing the multi-element structure comprises a pigment anchoring structure, a buffering structure and a solvation structure. The pigment anchoring structure is used for strengthening the adsorption capacity of the dispersing agent on the pigment, the buffer structure is used for assisting in separating the anchoring structure from the solvation structure, the mutual interference between the anchoring structure and the solvation structure is avoided, the solvation structure is used for increasing the solubility of the dispersing agent in a solvent, so that sufficient repulsive force or steric hindrance is generated among pigment particles, the pigment particles are not easy to flocculate or precipitate, and the dispersion stability is good.

(2) The multiplying agent and/or the polymerization inhibitor in the color paste are helpful to improve the stability of the color paste.

(3) The color paste prepared by the invention has good stability, so that the prepared UV ink-jet is not easy to generate pigment flocculation precipitation or anti-thickening phenomenon, the stability of the UV ink-jet is good, and the phenomena of nozzle blockage, oblique ink-drop spraying or ink-break and the like are not easy to generate in the printing process.

Detailed Description

In order to make the technical solutions of the present invention more apparent to those skilled in the art, the following examples are given for illustration. It should be noted that the following examples are not intended to limit the scope of the claimed invention.

The starting materials, reagents or apparatuses used in the following examples are conventionally commercially available or can be obtained by conventionally known methods, unless otherwise specified.